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# frozen_string_literal: true # # = net/imap.rb # # Copyright (C) 2000 Shugo Maeda <shugo@ruby-lang.org> # # This library is distributed under the terms of the Ruby license. # You can freely distribute/modify this library. # # Documentation: Shugo Maeda, with RDoc conversion and overview by William # Webber. # # See Net::IMAP for documentation. # require "socket" require "monitor" require "digest/md5" require "strscan" require 'net/protocol' begin require "openssl" rescue LoadError end module Net # # Net::IMAP implements Internet Message Access Protocol (IMAP) client # functionality. The protocol is described in [IMAP]. # # == IMAP Overview # # An IMAP client connects to a server, and then authenticates # itself using either #authenticate() or #login(). Having # authenticated itself, there is a range of commands # available to it. Most work with mailboxes, which may be # arranged in an hierarchical namespace, and each of which # contains zero or more messages. How this is implemented on # the server is implementation-dependent; on a UNIX server, it # will frequently be implemented as files in mailbox format # within a hierarchy of directories. # # To work on the messages within a mailbox, the client must # first select that mailbox, using either #select() or (for # read-only access) #examine(). Once the client has successfully # selected a mailbox, they enter _selected_ state, and that # mailbox becomes the _current_ mailbox, on which mail-item # related commands implicitly operate. # # Messages have two sorts of identifiers: message sequence # numbers and UIDs. # # Message sequence numbers number messages within a mailbox # from 1 up to the number of items in the mailbox. If a new # message arrives during a session, it receives a sequence # number equal to the new size of the mailbox. If messages # are expunged from the mailbox, remaining messages have their # sequence numbers "shuffled down" to fill the gaps. # # UIDs, on the other hand, are permanently guaranteed not to # identify another message within the same mailbox, even if # the existing message is deleted. UIDs are required to # be assigned in ascending (but not necessarily sequential) # order within a mailbox; this means that if a non-IMAP client # rearranges the order of mailitems within a mailbox, the # UIDs have to be reassigned. An IMAP client thus cannot # rearrange message orders. # # == Examples of Usage # # === List sender and subject of all recent messages in the default mailbox # # imap = Net::IMAP.new('mail.example.com') # imap.authenticate('LOGIN', 'joe_user', 'joes_password') # imap.examine('INBOX') # imap.search(["RECENT"]).each do \|message_id\| # envelope = imap.fetch(message_id, "ENVELOPE")[0].attr["ENVELOPE"] # puts "#{envelope.from[0].name}: \t#{envelope.subject}" # end # # === Move all messages from April 2003 from "Mail/sent-mail" to "Mail/sent-apr03" # # imap = Net::IMAP.new('mail.example.com') # imap.authenticate('LOGIN', 'joe_user', 'joes_password') # imap.select('Mail/sent-mail') # if not imap.list('Mail/', 'sent-apr03') # imap.create('Mail/sent-apr03') # end # imap.search(["BEFORE", "30-Apr-2003", "SINCE", "1-Apr-2003"]).each do \|message_id\| # imap.copy(message_id, "Mail/sent-apr03") # imap.store(message_id, "+FLAGS", [:Deleted]) # end # imap.expunge # # == Thread Safety # # Net::IMAP supports concurrent threads. For example, # # imap = Net::IMAP.new("imap.foo.net", "imap2") # imap.authenticate("cram-md5", "bar", "password") # imap.select("inbox") # fetch_thread = Thread.start { imap.fetch(1..-1, "UID") } # search_result = imap.search(["BODY", "hello"]) # fetch_result = fetch_thread.value # imap.disconnect # # This script invokes the FETCH command and the SEARCH command concurrently. # # == Errors # # An IMAP server can send three different types of responses to indicate # failure: # # NO:: the attempted command could not be successfully completed. For # instance, the username/password used for logging in are incorrect; # the selected mailbox does not exist; etc. # # BAD:: the request from the client does not follow the server's # understanding of the IMAP protocol. This includes attempting # commands from the wrong client state; for instance, attempting # to perform a SEARCH command without having SELECTed a current # mailbox. It can also signal an internal server # failure (such as a disk crash) has occurred. # # BYE:: the server is saying goodbye. This can be part of a normal # logout sequence, and can be used as part of a login sequence # to indicate that the server is (for some reason) unwilling # to accept your connection. As a response to any other command, # it indicates either that the server is shutting down, or that # the server is timing out the client connection due to inactivity. # # These three error response are represented by the errors # Net::IMAP::NoResponseError, Net::IMAP::BadResponseError, and # Net::IMAP::ByeResponseError, all of which are subclasses of # Net::IMAP::ResponseError. Essentially, all methods that involve # sending a request to the server can generate one of these errors. # Only the most pertinent instances have been documented below. # # Because the IMAP class uses Sockets for communication, its methods # are also susceptible to the various errors that can occur when # working with sockets. These are generally represented as # Errno errors. For instance, any method that involves sending a # request to the server and/or receiving a response from it could # raise an Errno::EPIPE error if the network connection unexpectedly # goes down. See the socket(7), ip(7), tcp(7), socket(2), connect(2), # and associated man pages. # # Finally, a Net::IMAP::DataFormatError is thrown if low-level data # is found to be in an incorrect format (for instance, when converting # between UTF-8 and UTF-16), and Net::IMAP::ResponseParseError is # thrown if a server response is non-parseable. # # # == References # # [[IMAP]] # M. Crispin, "INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1", # RFC 2060, December 1996. (Note: since obsoleted by RFC 3501) # # [[LANGUAGE-TAGS]] # Alvestrand, H., "Tags for the Identification of # Languages", RFC 1766, March 1995. # # [[MD5]] # Myers, J., and M. Rose, "The Content-MD5 Header Field", RFC # 1864, October 1995. # # [[MIME-IMB]] # Freed, N., and N. Borenstein, "MIME (Multipurpose Internet # Mail Extensions) Part One: Format of Internet Message Bodies", RFC # 2045, November 1996. # # [[RFC-822]] # Crocker, D., "Standard for the Format of ARPA Internet Text # Messages", STD 11, RFC 822, University of Delaware, August 1982. # # [[RFC-2087]] # Myers, J., "IMAP4 QUOTA extension", RFC 2087, January 1997. # # [[RFC-2086]] # Myers, J., "IMAP4 ACL extension", RFC 2086, January 1997. # # [[RFC-2195]] # Klensin, J., Catoe, R., and Krumviede, P., "IMAP/POP AUTHorize Extension # for Simple Challenge/Response", RFC 2195, September 1997. # # [[SORT-THREAD-EXT]] # Crispin, M., "INTERNET MESSAGE ACCESS PROTOCOL - SORT and THREAD # Extensions", draft-ietf-imapext-sort, May 2003. # # [[OSSL]] # http://www.openssl.org # # [[RSSL]] # http://savannah.gnu.org/projects/rubypki # # [[UTF7]] # Goldsmith, D. and Davis, M., "UTF-7: A Mail-Safe Transformation Format of # Unicode", RFC 2152, May 1997. # class IMAP < Protocol VERSION = "0.1.1" include MonitorMixin if defined?(OpenSSL::SSL) include OpenSSL include SSL end # Returns an initial greeting response from the server. attr_reader :greeting # Returns recorded untagged responses. For example: # # imap.select("inbox") # p imap.responses["EXISTS"][-1] # #=> 2 # p imap.responses["UIDVALIDITY"][-1] # #=> 968263756 attr_reader :responses # Returns all response handlers. attr_reader :response_handlers # Seconds to wait until a connection is opened. # If the IMAP object cannot open a connection within this time, # it raises a Net::OpenTimeout exception. The default value is 30 seconds. attr_reader :open_timeout # The thread to receive exceptions. attr_accessor :client_thread # Flag indicating a message has been seen. SEEN = :Seen # Flag indicating a message has been answered. ANSWERED = :Answered # Flag indicating a message has been flagged for special or urgent # attention. FLAGGED = :Flagged # Flag indicating a message has been marked for deletion. This # will occur when the mailbox is closed or expunged. DELETED = :Deleted # Flag indicating a message is only a draft or work-in-progress version. DRAFT = :Draft # Flag indicating that the message is "recent," meaning that this # session is the first session in which the client has been notified # of this message. RECENT = :Recent # Flag indicating that a mailbox context name cannot contain # children. NOINFERIORS = :Noinferiors # Flag indicating that a mailbox is not selected. NOSELECT = :Noselect # Flag indicating that a mailbox has been marked "interesting" by # the server; this commonly indicates that the mailbox contains # new messages. MARKED = :Marked # Flag indicating that the mailbox does not contains new messages. UNMARKED = :Unmarked # Returns the debug mode. def self.debug return @@debug end # Sets the debug mode. def self.debug=(val) return @@debug = val end # Returns the max number of flags interned to symbols. def self.max_flag_count return @@max_flag_count end # Sets the max number of flags interned to symbols. def self.max_flag_count=(count) @@max_flag_count = count end # Adds an authenticator for Net::IMAP#authenticate. +auth_type+ # is the type of authentication this authenticator supports # (for instance, "LOGIN"). The +authenticator+ is an object # which defines a process() method to handle authentication with # the server. See Net::IMAP::LoginAuthenticator, # Net::IMAP::CramMD5Authenticator, and Net::IMAP::DigestMD5Authenticator # for examples. # # # If +auth_type+ refers to an existing authenticator, it will be # replaced by the new one. def self.add_authenticator(auth_type, authenticator) @@authenticators[auth_type] = authenticator end # The default port for IMAP connections, port 143 def self.default_port return PORT end # The default port for IMAPS connections, port 993 def self.default_tls_port return SSL_PORT end class << self alias default_imap_port default_port alias default_imaps_port default_tls_port alias default_ssl_port default_tls_port end # Disconnects from the server. def disconnect return if disconnected? begin begin # try to call SSL::SSLSocket#io. @sock.io.shutdown rescue NoMethodError # @sock is not an SSL::SSLSocket. @sock.shutdown end rescue Errno::ENOTCONN # ignore `Errno::ENOTCONN: Socket is not connected' on some platforms. rescue Exception => e @receiver_thread.raise(e) end @receiver_thread.join synchronize do @sock.close end raise e if e end # Returns true if disconnected from the server. def disconnected? return @sock.closed? end # Sends a CAPABILITY command, and returns an array of # capabilities that the server supports. Each capability # is a string. See [IMAP] for a list of possible # capabilities. # # Note that the Net::IMAP class does not modify its # behaviour according to the capabilities of the server; # it is up to the user of the class to ensure that # a certain capability is supported by a server before # using it. def capability synchronize do send_command("CAPABILITY") return @responses.delete("CAPABILITY")[-1] end end # Sends a NOOP command to the server. It does nothing. def noop send_command("NOOP") end # Sends a LOGOUT command to inform the server that the client is # done with the connection. def logout send_command("LOGOUT") end # Sends a STARTTLS command to start TLS session. def starttls(options = {}, verify = true) send_command("STARTTLS") do \|resp\| if resp.kind_of?(TaggedResponse) && resp.name == "OK" begin # for backward compatibility certs = options.to_str options = create_ssl_params(certs, verify) rescue NoMethodError end start_tls_session(options) end end end # Sends an AUTHENTICATE command to authenticate the client. # The +auth_type+ parameter is a string that represents # the authentication mechanism to be used. Currently Net::IMAP # supports the authentication mechanisms: # # LOGIN:: login using cleartext user and password. # CRAM-MD5:: login with cleartext user and encrypted password # (see [RFC-2195] for a full description). This # mechanism requires that the server have the user's # password stored in clear-text password. # # For both of these mechanisms, there should be two +args+: username # and (cleartext) password. A server may not support one or the other # of these mechanisms; check #capability() for a capability of # the form "AUTH=LOGIN" or "AUTH=CRAM-MD5". # # Authentication is done using the appropriate authenticator object: # see @@authenticators for more information on plugging in your own # authenticator. # # For example: # # imap.authenticate('LOGIN', user, password) # # A Net::IMAP::NoResponseError is raised if authentication fails. def authenticate(auth_type, args) auth_type = auth_type.upcase unless @@authenticators.has_key?(auth_type) raise ArgumentError, format('unknown auth type - "%s"', auth_type) end authenticator = @@authenticators[auth_type].new(args) send_command("AUTHENTICATE", auth_type) do \|resp\| if resp.instance_of?(ContinuationRequest) data = authenticator.process(resp.data.text.unpack("m")[0]) s = [data].pack("m0") send_string_data(s) put_string(CRLF) end end end # Sends a LOGIN command to identify the client and carries # the plaintext +password+ authenticating this +user+. Note # that, unlike calling #authenticate() with an +auth_type+ # of "LOGIN", #login() does not use the login authenticator. # # A Net::IMAP::NoResponseError is raised if authentication fails. def login(user, password) send_command("LOGIN", user, password) end # Sends a SELECT command to select a +mailbox+ so that messages # in the +mailbox+ can be accessed. # # After you have selected a mailbox, you may retrieve the # number of items in that mailbox from @responses["EXISTS"][-1], # and the number of recent messages from @responses["RECENT"][-1]. # Note that these values can change if new messages arrive # during a session; see #add_response_handler() for a way of # detecting this event. # # A Net::IMAP::NoResponseError is raised if the mailbox does not # exist or is for some reason non-selectable. def select(mailbox) synchronize do @responses.clear send_command("SELECT", mailbox) end end # Sends a EXAMINE command to select a +mailbox+ so that messages # in the +mailbox+ can be accessed. Behaves the same as #select(), # except that the selected +mailbox+ is identified as read-only. # # A Net::IMAP::NoResponseError is raised if the mailbox does not # exist or is for some reason non-examinable. def examine(mailbox) synchronize do @responses.clear send_command("EXAMINE", mailbox) end end # Sends a CREATE command to create a new +mailbox+. # # A Net::IMAP::NoResponseError is raised if a mailbox with that name # cannot be created. def create(mailbox) send_command("CREATE", mailbox) end # Sends a DELETE command to remove the +mailbox+. # # A Net::IMAP::NoResponseError is raised if a mailbox with that name # cannot be deleted, either because it does not exist or because the # client does not have permission to delete it. def delete(mailbox) send_command("DELETE", mailbox) end # Sends a RENAME command to change the name of the +mailbox+ to # +newname+. # # A Net::IMAP::NoResponseError is raised if a mailbox with the # name +mailbox+ cannot be renamed to +newname+ for whatever # reason; for instance, because +mailbox+ does not exist, or # because there is already a mailbox with the name +newname+. def rename(mailbox, newname) send_command("RENAME", mailbox, newname) end # Sends a SUBSCRIBE command to add the specified +mailbox+ name to # the server's set of "active" or "subscribed" mailboxes as returned # by #lsub(). # # A Net::IMAP::NoResponseError is raised if +mailbox+ cannot be # subscribed to; for instance, because it does not exist. def subscribe(mailbox) send_command("SUBSCRIBE", mailbox) end # Sends a UNSUBSCRIBE command to remove the specified +mailbox+ name # from the server's set of "active" or "subscribed" mailboxes. # # A Net::IMAP::NoResponseError is raised if +mailbox+ cannot be # unsubscribed from; for instance, because the client is not currently # subscribed to it. def unsubscribe(mailbox) send_command("UNSUBSCRIBE", mailbox) end # Sends a LIST command, and returns a subset of names from # the complete set of all names available to the client. # +refname+ provides a context (for instance, a base directory # in a directory-based mailbox hierarchy). +mailbox+ specifies # a mailbox or (via wildcards) mailboxes under that context. # Two wildcards may be used in +mailbox+: '', which matches # all characters including* the hierarchy delimiter (for instance, # '/' on a UNIX-hosted directory-based mailbox hierarchy); and '%', # which matches all characters except the hierarchy delimiter. # # If +refname+ is empty, +mailbox+ is used directly to determine # which mailboxes to match. If +mailbox+ is empty, the root # name of +refname+ and the hierarchy delimiter are returned. # # The return value is an array of +Net::IMAP::MailboxList+. For example: # # imap.create("foo/bar") # imap.create("foo/baz") # p imap.list("", "foo/%") # #=> [#<Net::IMAP::MailboxList attr=[:Noselect], delim="/", name="foo/">, \\ # #<Net::IMAP::MailboxList attr=[:Noinferiors, :Marked], delim="/", name="foo/bar">, \\ # #<Net::IMAP::MailboxList attr=[:Noinferiors], delim="/", name="foo/baz">] def list(refname, mailbox) synchronize do send_command("LIST", refname, mailbox) return @responses.delete("LIST") end end # Sends a XLIST command, and returns a subset of names from # the complete set of all names available to the client. # +refname+ provides a context (for instance, a base directory # in a directory-based mailbox hierarchy). +mailbox+ specifies # a mailbox or (via wildcards) mailboxes under that context. # Two wildcards may be used in +mailbox+: '', which matches # all characters including* the hierarchy delimiter (for instance, # '/' on a UNIX-hosted directory-based mailbox hierarchy); and '%', # which matches all characters except the hierarchy delimiter. # # If +refname+ is empty, +mailbox+ is used directly to determine # which mailboxes to match. If +mailbox+ is empty, the root # name of +refname+ and the hierarchy delimiter are returned. # # The XLIST command is like the LIST command except that the flags # returned refer to the function of the folder/mailbox, e.g. :Sent # # The return value is an array of +Net::IMAP::MailboxList+. For example: # # imap.create("foo/bar") # imap.create("foo/baz") # p imap.xlist("", "foo/%") # #=> [#<Net::IMAP::MailboxList attr=[:Noselect], delim="/", name="foo/">, \\ # #<Net::IMAP::MailboxList attr=[:Noinferiors, :Marked], delim="/", name="foo/bar">, \\ # #<Net::IMAP::MailboxList attr=[:Noinferiors], delim="/", name="foo/baz">] def xlist(refname, mailbox) synchronize do send_command("XLIST", refname, mailbox) return @responses.delete("XLIST") end end # Sends the GETQUOTAROOT command along with the specified +mailbox+. # This command is generally available to both admin and user. # If this mailbox exists, it returns an array containing objects of type # Net::IMAP::MailboxQuotaRoot and Net::IMAP::MailboxQuota. def getquotaroot(mailbox) synchronize do send_command("GETQUOTAROOT", mailbox) result = [] result.concat(@responses.delete("QUOTAROOT")) result.concat(@responses.delete("QUOTA")) return result end end # Sends the GETQUOTA command along with specified +mailbox+. # If this mailbox exists, then an array containing a # Net::IMAP::MailboxQuota object is returned. This # command is generally only available to server admin. def getquota(mailbox) synchronize do send_command("GETQUOTA", mailbox) return @responses.delete("QUOTA") end end # Sends a SETQUOTA command along with the specified +mailbox+ and # +quota+. If +quota+ is nil, then +quota+ will be unset for that # mailbox. Typically one needs to be logged in as a server admin # for this to work. The IMAP quota commands are described in # [RFC-2087]. def setquota(mailbox, quota) if quota.nil? data = '()' else data = '(STORAGE ' + quota.to_s + ')' end send_command("SETQUOTA", mailbox, RawData.new(data)) end # Sends the SETACL command along with +mailbox+, +user+ and the # +rights+ that user is to have on that mailbox. If +rights+ is nil, # then that user will be stripped of any rights to that mailbox. # The IMAP ACL commands are described in [RFC-2086]. def setacl(mailbox, user, rights) if rights.nil? send_command("SETACL", mailbox, user, "") else send_command("SETACL", mailbox, user, rights) end end # Send the GETACL command along with a specified +mailbox+. # If this mailbox exists, an array containing objects of # Net::IMAP::MailboxACLItem will be returned. def getacl(mailbox) synchronize do send_command("GETACL", mailbox) return @responses.delete("ACL")[-1] end end # Sends a LSUB command, and returns a subset of names from the set # of names that the user has declared as being "active" or # "subscribed." +refname+ and +mailbox+ are interpreted as # for #list(). # The return value is an array of +Net::IMAP::MailboxList+. def lsub(refname, mailbox) synchronize do send_command("LSUB", refname, mailbox) return @responses.delete("LSUB") end end # Sends a STATUS command, and returns the status of the indicated # +mailbox+. +attr+ is a list of one or more attributes whose # statuses are to be requested. Supported attributes include: # # MESSAGES:: the number of messages in the mailbox. # RECENT:: the number of recent messages in the mailbox. # UNSEEN:: the number of unseen messages in the mailbox. # # The return value is a hash of attributes. For example: # # p imap.status("inbox", ["MESSAGES", "RECENT"]) # #=> {"RECENT"=>0, "MESSAGES"=>44} # # A Net::IMAP::NoResponseError is raised if status values # for +mailbox+ cannot be returned; for instance, because it # does not exist. def status(mailbox, attr) synchronize do send_command("STATUS", mailbox, attr) return @responses.delete("STATUS")[-1].attr end end # Sends a APPEND command to append the +message+ to the end of # the +mailbox+. The optional +flags+ argument is an array of # flags initially passed to the new message. The optional # +date_time+ argument specifies the creation time to assign to the # new message; it defaults to the current time. # For example: # # imap.append("inbox", <<EOF.gsub(/\n/, "\r\n"), [:Seen], Time.now) # Subject: hello # From: shugo@ruby-lang.org # To: shugo@ruby-lang.org # # hello world # EOF # # A Net::IMAP::NoResponseError is raised if the mailbox does # not exist (it is not created automatically), or if the flags, # date_time, or message arguments contain errors. def append(mailbox, message, flags = nil, date_time = nil) args = [] if flags args.push(flags) end args.push(date_time) if date_time args.push(Literal.new(message)) send_command("APPEND", mailbox, args) end # Sends a CHECK command to request a checkpoint of the currently # selected mailbox. This performs implementation-specific # housekeeping; for instance, reconciling the mailbox's # in-memory and on-disk state. def check send_command("CHECK") end # Sends a CLOSE command to close the currently selected mailbox. # The CLOSE command permanently removes from the mailbox all # messages that have the \Deleted flag set. def close send_command("CLOSE") end # Sends a EXPUNGE command to permanently remove from the currently # selected mailbox all messages that have the \Deleted flag set. def expunge synchronize do send_command("EXPUNGE") return @responses.delete("EXPUNGE") end end # Sends a SEARCH command to search the mailbox for messages that # match the given searching criteria, and returns message sequence # numbers. +keys+ can either be a string holding the entire # search string, or a single-dimension array of search keywords and # arguments. The following are some common search criteria; # see [IMAP] section 6.4.4 for a full list. # # <message set>:: a set of message sequence numbers. ',' indicates # an interval, ':' indicates a range. For instance, # '2,10:12,15' means "2,10,11,12,15". # # BEFORE <date>:: messages with an internal date strictly before # <date>. The date argument has a format similar # to 8-Aug-2002. # # BODY <string>:: messages that contain <string> within their body. # # CC <string>:: messages containing <string> in their CC field. # # FROM <string>:: messages that contain <string> in their FROM field. # # NEW:: messages with the \Recent, but not the \Seen, flag set. # # NOT <search-key>:: negate the following search key. # # OR <search-key> <search-key>:: "or" two search keys together. # # ON <date>:: messages with an internal date exactly equal to <date>, # which has a format similar to 8-Aug-2002. # # SINCE <date>:: messages with an internal date on or after <date>. # # SUBJECT <string>:: messages with <string> in their subject. # # TO <string>:: messages with <string> in their TO field. # # For example: # # p imap.search(["SUBJECT", "hello", "NOT", "NEW"]) # #=> [1, 6, 7, 8] def search(keys, charset = nil) return search_internal("SEARCH", keys, charset) end # Similar to #search(), but returns unique identifiers. def uid_search(keys, charset = nil) return search_internal("UID SEARCH", keys, charset) end # Sends a FETCH command to retrieve data associated with a message # in the mailbox. # # The +set+ parameter is a number or a range between two numbers, # or an array of those. The number is a message sequence number, # where -1 represents a '' for use in range notation like 100..-1 # being interpreted as '100:'. Beware that the +exclude_end?+ # property of a Range object is ignored, and the contents of a # range are independent of the order of the range endpoints as per # the protocol specification, so 1...5, 5..1 and 5...1 are all # equivalent to 1..5. # # +attr+ is a list of attributes to fetch; see the documentation # for Net::IMAP::FetchData for a list of valid attributes. # # The return value is an array of Net::IMAP::FetchData or nil # (instead of an empty array) if there is no matching message. # # For example: # # p imap.fetch(6..8, "UID") # #=> [#<Net::IMAP::FetchData seqno=6, attr={"UID"=>98}>, \\ # #<Net::IMAP::FetchData seqno=7, attr={"UID"=>99}>, \\ # #<Net::IMAP::FetchData seqno=8, attr={"UID"=>100}>] # p imap.fetch(6, "BODY[HEADER.FIELDS (SUBJECT)]") # #=> [#<Net::IMAP::FetchData seqno=6, attr={"BODY[HEADER.FIELDS (SUBJECT)]"=>"Subject: test\r\n\r\n"}>] # data = imap.uid_fetch(98, ["RFC822.SIZE", "INTERNALDATE"])[0] # p data.seqno # #=> 6 # p data.attr["RFC822.SIZE"] # #=> 611 # p data.attr["INTERNALDATE"] # #=> "12-Oct-2000 22:40:59 +0900" # p data.attr["UID"] # #=> 98 def fetch(set, attr, mod = nil) return fetch_internal("FETCH", set, attr, mod) end # Similar to #fetch(), but +set+ contains unique identifiers. def uid_fetch(set, attr, mod = nil) return fetch_internal("UID FETCH", set, attr, mod) end # Sends a STORE command to alter data associated with messages # in the mailbox, in particular their flags. The +set+ parameter # is a number, an array of numbers, or a Range object. Each number # is a message sequence number. +attr+ is the name of a data item # to store: 'FLAGS' will replace the message's flag list # with the provided one, '+FLAGS' will add the provided flags, # and '-FLAGS' will remove them. +flags+ is a list of flags. # # The return value is an array of Net::IMAP::FetchData. For example: # # p imap.store(6..8, "+FLAGS", [:Deleted]) # #=> [#<Net::IMAP::FetchData seqno=6, attr={"FLAGS"=>[:Seen, :Deleted]}>, \\ # #<Net::IMAP::FetchData seqno=7, attr={"FLAGS"=>[:Seen, :Deleted]}>, \\ # #<Net::IMAP::FetchData seqno=8, attr={"FLAGS"=>[:Seen, :Deleted]}>] def store(set, attr, flags) return store_internal("STORE", set, attr, flags) end # Similar to #store(), but +set+ contains unique identifiers. def uid_store(set, attr, flags) return store_internal("UID STORE", set, attr, flags) end # Sends a COPY command to copy the specified message(s) to the end # of the specified destination +mailbox+. The +set+ parameter is # a number, an array of numbers, or a Range object. The number is # a message sequence number. def copy(set, mailbox) copy_internal("COPY", set, mailbox) end # Similar to #copy(), but +set+ contains unique identifiers. def uid_copy(set, mailbox) copy_internal("UID COPY", set, mailbox) end # Sends a MOVE command to move the specified message(s) to the end # of the specified destination +mailbox+. The +set+ parameter is # a number, an array of numbers, or a Range object. The number is # a message sequence number. # The IMAP MOVE extension is described in [RFC-6851]. def move(set, mailbox) copy_internal("MOVE", set, mailbox) end # Similar to #move(), but +set+ contains unique identifiers. def uid_move(set, mailbox) copy_internal("UID MOVE", set, mailbox) end # Sends a SORT command to sort messages in the mailbox. # Returns an array of message sequence numbers. For example: # # p imap.sort(["FROM"], ["ALL"], "US-ASCII") # #=> [1, 2, 3, 5, 6, 7, 8, 4, 9] # p imap.sort(["DATE"], ["SUBJECT", "hello"], "US-ASCII") # #=> [6, 7, 8, 1] # # See [SORT-THREAD-EXT] for more details. def sort(sort_keys, search_keys, charset) return sort_internal("SORT", sort_keys, search_keys, charset) end # Similar to #sort(), but returns an array of unique identifiers. def uid_sort(sort_keys, search_keys, charset) return sort_internal("UID SORT", sort_keys, search_keys, charset) end # Adds a response handler. For example, to detect when # the server sends a new EXISTS response (which normally # indicates new messages being added to the mailbox), # add the following handler after selecting the # mailbox: # # imap.add_response_handler { \|resp\| # if resp.kind_of?(Net::IMAP::UntaggedResponse) and resp.name == "EXISTS" # puts "Mailbox now has #{resp.data} messages" # end # } # def add_response_handler(handler = nil, &block) raise ArgumentError, "two Procs are passed" if handler && block @response_handlers.push(block \|\| handler) end # Removes the response handler. def remove_response_handler(handler) @response_handlers.delete(handler) end # Similar to #search(), but returns message sequence numbers in threaded # format, as a Net::IMAP::ThreadMember tree. The supported algorithms # are: # # ORDEREDSUBJECT:: split into single-level threads according to subject, # ordered by date. # REFERENCES:: split into threads by parent/child relationships determined # by which message is a reply to which. # # Unlike #search(), +charset+ is a required argument. US-ASCII # and UTF-8 are sample values. # # See [SORT-THREAD-EXT] for more details. def thread(algorithm, search_keys, charset) return thread_internal("THREAD", algorithm, search_keys, charset) end # Similar to #thread(), but returns unique identifiers instead of # message sequence numbers. def uid_thread(algorithm, search_keys, charset) return thread_internal("UID THREAD", algorithm, search_keys, charset) end # Sends an IDLE command that waits for notifications of new or expunged # messages. Yields responses from the server during the IDLE. # # Use #idle_done() to leave IDLE. # # If +timeout+ is given, this method returns after +timeout+ seconds passed. # +timeout+ can be used for keep-alive. For example, the following code # checks the connection for each 60 seconds. # # loop do # imap.idle(60) do \|res\| # ... # end # end def idle(timeout = nil, &response_handler) raise LocalJumpError, "no block given" unless response_handler response = nil synchronize do tag = Thread.current[:net_imap_tag] = generate_tag put_string("#{tag} IDLE#{CRLF}") begin add_response_handler(&response_handler) @idle_done_cond = new_cond @idle_done_cond.wait(timeout) @idle_done_cond = nil if @receiver_thread_terminating raise @exception \|\| Net::IMAP::Error.new("connection closed") end ensure unless @receiver_thread_terminating remove_response_handler(response_handler) put_string("DONE#{CRLF}") response = get_tagged_response(tag, "IDLE") end end end return response end # Leaves IDLE. def idle_done synchronize do if @idle_done_cond.nil? raise Net::IMAP::Error, "not during IDLE" end @idle_done_cond.signal end end # Decode a string from modified UTF-7 format to UTF-8. # # UTF-7 is a 7-bit encoding of Unicode [UTF7]. IMAP uses a # slightly modified version of this to encode mailbox names # containing non-ASCII characters; see [IMAP] section 5.1.3. # # Net::IMAP does _not_ automatically encode and decode # mailbox names to and from UTF-7. def self.decode_utf7(s) return s.gsub(/&([^-]+)?-/n) { if $1 ($1.tr(",", "/") + "===").unpack1("m").encode(Encoding::UTF_8, Encoding::UTF_16BE) else "&" end } end # Encode a string from UTF-8 format to modified UTF-7. def self.encode_utf7(s) return s.gsub(/(&)\|[^\x20-\x7e]+/) { if $1 "&-" else base64 = [$&.encode(Encoding::UTF_16BE)].pack("m0") "&" + base64.delete("=").tr("/", ",") + "-" end }.force_encoding("ASCII-8BIT") end # Formats +time+ as an IMAP-style date. def self.format_date(time) return time.strftime('%d-%b-%Y') end # Formats +time+ as an IMAP-style date-time. def self.format_datetime(time) return time.strftime('%d-%b-%Y %H:%M %z') end private CRLF = "\r\n" # :nodoc: PORT = 143 # :nodoc: SSL_PORT = 993 # :nodoc: @@debug = false @@authenticators = {} @@max_flag_count = 10000 # :call-seq: # Net::IMAP.new(host, options = {}) # # Creates a new Net::IMAP object and connects it to the specified # +host+. # # +options+ is an option hash, each key of which is a symbol. # # The available options are: # # port:: Port number (default value is 143 for imap, or 993 for imaps) # ssl:: If options[:ssl] is true, then an attempt will be made # to use SSL (now TLS) to connect to the server. For this to work # OpenSSL [OSSL] and the Ruby OpenSSL [RSSL] extensions need to # be installed. # If options[:ssl] is a hash, it's passed to # OpenSSL::SSL::SSLContext#set_params as parameters. # open_timeout:: Seconds to wait until a connection is opened # # The most common errors are: # # Errno::ECONNREFUSED:: Connection refused by +host+ or an intervening # firewall. # Errno::ETIMEDOUT:: Connection timed out (possibly due to packets # being dropped by an intervening firewall). # Errno::ENETUNREACH:: There is no route to that network. # SocketError:: Hostname not known or other socket error. # Net::IMAP::ByeResponseError:: The connected to the host was successful, but # it immediately said goodbye. def initialize(host, port_or_options = {}, usessl = false, certs = nil, verify = true) super() @host = host begin options = port_or_options.to_hash rescue NoMethodError # for backward compatibility options = {} options[:port] = port_or_options if usessl options[:ssl] = create_ssl_params(certs, verify) end end @port = options[:port] \|\| (options[:ssl] ? SSL_PORT : PORT) @tag_prefix = "RUBY" @tagno = 0 @open_timeout = options[:open_timeout] \|\| 30 @parser = ResponseParser.new @sock = tcp_socket(@host, @port) begin if options[:ssl] start_tls_session(options[:ssl]) @usessl = true else @usessl = false end @responses = Hash.new([].freeze) @tagged_responses = {} @response_handlers = [] @tagged_response_arrival = new_cond @continued_command_tag = nil @continuation_request_arrival = new_cond @continuation_request_exception = nil @idle_done_cond = nil @logout_command_tag = nil @debug_output_bol = true @exception = nil @greeting = get_response if @greeting.nil? raise Error, "connection closed" end if @greeting.name == "BYE" raise ByeResponseError, @greeting end @client_thread = Thread.current @receiver_thread = Thread.start { begin receive_responses rescue Exception end } @receiver_thread_terminating = false rescue Exception @sock.close raise end end def tcp_socket(host, port) s = Socket.tcp(host, port, :connect_timeout => @open_timeout) s.setsockopt(:SOL_SOCKET, :SO_KEEPALIVE, true) s rescue Errno::ETIMEDOUT raise Net::OpenTimeout, "Timeout to open TCP connection to " + "#{host}:#{port} (exceeds #{@open_timeout} seconds)" end def receive_responses connection_closed = false until connection_closed synchronize do @exception = nil end begin resp = get_response rescue Exception => e synchronize do @sock.close @exception = e end break end unless resp synchronize do @exception = EOFError.new("end of file reached") end break end begin synchronize do case resp when TaggedResponse @tagged_responses[resp.tag] = resp @tagged_response_arrival.broadcast case resp.tag when @logout_command_tag return when @continued_command_tag @continuation_request_exception = RESPONSE_ERRORS[resp.name].new(resp) @continuation_request_arrival.signal end when UntaggedResponse record_response(resp.name, resp.data) if resp.data.instance_of?(ResponseText) && (code = resp.data.code) record_response(code.name, code.data) end if resp.name == "BYE" && @logout_command_tag.nil? @sock.close @exception = ByeResponseError.new(resp) connection_closed = true end when ContinuationRequest @continuation_request_arrival.signal end @response_handlers.each do \|handler\| handler.call(resp) end end rescue Exception => e @exception = e synchronize do @tagged_response_arrival.broadcast @continuation_request_arrival.broadcast end end end synchronize do @receiver_thread_terminating = true @tagged_response_arrival.broadcast @continuation_request_arrival.broadcast if @idle_done_cond @idle_done_cond.signal end end end def get_tagged_response(tag, cmd) until @tagged_responses.key?(tag) raise @exception if @exception @tagged_response_arrival.wait end resp = @tagged_responses.delete(tag) case resp.name when /\A(?:OK)\z/ni return resp when /\A(?:NO)\z/ni raise NoResponseError, resp when /\A(?:BAD)\z/ni raise BadResponseError, resp else raise UnknownResponseError, resp end end def get_response buff = String.new while true s = @sock.gets(CRLF) break unless s buff.concat(s) if /\{(\d+)\}\r\n/n =~ s s = @sock.read($1.to_i) buff.concat(s) else break end end return nil if buff.length == 0 if @@debug $stderr.print(buff.gsub(/^/n, "S: ")) end return @parser.parse(buff) end def record_response(name, data) unless @responses.has_key?(name) @responses[name] = [] end @responses[name].push(data) end def send_command(cmd, args, &block) synchronize do args.each do \|i\| validate_data(i) end tag = generate_tag put_string(tag + " " + cmd) args.each do \|i\| put_string(" ") send_data(i, tag) end put_string(CRLF) if cmd == "LOGOUT" @logout_command_tag = tag end if block add_response_handler(&block) end begin return get_tagged_response(tag, cmd) ensure if block remove_response_handler(block) end end end end def generate_tag @tagno += 1 return format("%s%04d", @tag_prefix, @tagno) end def put_string(str) @sock.print(str) if @@debug if @debug_output_bol $stderr.print("C: ") end $stderr.print(str.gsub(/\n(?!\z)/n, "\nC: ")) if /\r\n\z/n.match(str) @debug_output_bol = true else @debug_output_bol = false end end end def validate_data(data) case data when nil when String when Integer NumValidator.ensure_number(data) when Array if data[0] == 'CHANGEDSINCE' NumValidator.ensure_mod_sequence_value(data[1]) else data.each do \|i\| validate_data(i) end end when Time when Symbol else data.validate end end def send_data(data, tag = nil) case data when nil put_string("NIL") when String send_string_data(data, tag) when Integer send_number_data(data) when Array send_list_data(data, tag) when Time send_time_data(data) when Symbol send_symbol_data(data) else data.send_data(self, tag) end end def send_string_data(str, tag = nil) case str when "" put_string('""') when /[\x80-\xff\r\n]/n # literal send_literal(str, tag) when /[(){ \x00-\x1f\x7f%"\\]/n # quoted string send_quoted_string(str) else put_string(str) end end def send_quoted_string(str) put_string('"' + str.gsub(/["\\]/n, "\\\\\\&") + '"') end def send_literal(str, tag = nil) synchronize do put_string("{" + str.bytesize.to_s + "}" + CRLF) @continued_command_tag = tag @continuation_request_exception = nil begin @continuation_request_arrival.wait e = @continuation_request_exception \|\| @exception raise e if e put_string(str) ensure @continued_command_tag = nil @continuation_request_exception = nil end end end def send_number_data(num) put_string(num.to_s) end def send_list_data(list, tag = nil) put_string("(") first = true list.each do \|i\| if first first = false else put_string(" ") end send_data(i, tag) end put_string(")") end DATE_MONTH = %w(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec) def send_time_data(time) t = time.dup.gmtime s = format('"%2d-%3s-%4d %02d:%02d:%02d +0000"', t.day, DATE_MONTH[t.month - 1], t.year, t.hour, t.min, t.sec) put_string(s) end def send_symbol_data(symbol) put_string("\\" + symbol.to_s) end def search_internal(cmd, keys, charset) if keys.instance_of?(String) keys = [RawData.new(keys)] else normalize_searching_criteria(keys) end synchronize do if charset send_command(cmd, "CHARSET", charset, keys) else send_command(cmd, keys) end return @responses.delete("SEARCH")[-1] end end def fetch_internal(cmd, set, attr, mod = nil) case attr when String then attr = RawData.new(attr) when Array then attr = attr.map { \|arg\| arg.is_a?(String) ? RawData.new(arg) : arg } end synchronize do @responses.delete("FETCH") if mod send_command(cmd, MessageSet.new(set), attr, mod) else send_command(cmd, MessageSet.new(set), attr) end return @responses.delete("FETCH") end end def store_internal(cmd, set, attr, flags) if attr.instance_of?(String) attr = RawData.new(attr) end synchronize do @responses.delete("FETCH") send_command(cmd, MessageSet.new(set), attr, flags) return @responses.delete("FETCH") end end def copy_internal(cmd, set, mailbox) send_command(cmd, MessageSet.new(set), mailbox) end def sort_internal(cmd, sort_keys, search_keys, charset) if search_keys.instance_of?(String) search_keys = [RawData.new(search_keys)] else normalize_searching_criteria(search_keys) end normalize_searching_criteria(search_keys) synchronize do send_command(cmd, sort_keys, charset, search_keys) return @responses.delete("SORT")[-1] end end def thread_internal(cmd, algorithm, search_keys, charset) if search_keys.instance_of?(String) search_keys = [RawData.new(search_keys)] else normalize_searching_criteria(search_keys) end normalize_searching_criteria(search_keys) send_command(cmd, algorithm, charset, search_keys) return @responses.delete("THREAD")[-1] end def normalize_searching_criteria(keys) keys.collect! do \|i\| case i when -1, Range, Array MessageSet.new(i) else i end end end def create_ssl_params(certs = nil, verify = true) params = {} if certs if File.file?(certs) params[:ca_file] = certs elsif File.directory?(certs) params[:ca_path] = certs end end if verify params[:verify_mode] = VERIFY_PEER else params[:verify_mode] = VERIFY_NONE end return params end def start_tls_session(params = {}) unless defined?(OpenSSL::SSL) raise "SSL extension not installed" end if @sock.kind_of?(OpenSSL::SSL::SSLSocket) raise RuntimeError, "already using SSL" end begin params = params.to_hash rescue NoMethodError params = {} end context = SSLContext.new context.set_params(params) if defined?(VerifyCallbackProc) context.verify_callback = VerifyCallbackProc end @sock = SSLSocket.new(@sock, context) @sock.sync_close = true @sock.hostname = @host if @sock.respond_to? :hostname= ssl_socket_connect(@sock, @open_timeout) if context.verify_mode != VERIFY_NONE @sock.post_connection_check(@host) end end class RawData # :nodoc: def send_data(imap, tag) imap.__send__(:put_string, @data) end def validate end private def initialize(data) @data = data end end class Atom # :nodoc: def send_data(imap, tag) imap.__send__(:put_string, @data) end def validate end private def initialize(data) @data = data end end class QuotedString # :nodoc: def send_data(imap, tag) imap.__send__(:send_quoted_string, @data) end def validate end private def initialize(data) @data = data end end class Literal # :nodoc: def send_data(imap, tag) imap.__send__(:send_literal, @data, tag) end def validate end private def initialize(data) @data = data end end class MessageSet # :nodoc: def send_data(imap, tag) imap.__send__(:put_string, format_internal(@data)) end def validate validate_internal(@data) end private def initialize(data) @data = data end def format_internal(data) case data when "" return data when Integer if data == -1 return "" else return data.to_s end when Range return format_internal(data.first) + ":" + format_internal(data.last) when Array return data.collect {\|i\| format_internal(i)}.join(",") when ThreadMember return data.seqno.to_s + ":" + data.children.collect {\|i\| format_internal(i).join(",")} end end def validate_internal(data) case data when "" when Integer NumValidator.ensure_nz_number(data) when Range when Array data.each do \|i\| validate_internal(i) end when ThreadMember data.children.each do \|i\| validate_internal(i) end else raise DataFormatError, data.inspect end end end # Common validators of number and nz_number types module NumValidator # :nodoc class << self # Check is passed argument valid 'number' in RFC 3501 terminology def valid_number?(num) # [RFC 3501] # number = 1DIGIT # ; Unsigned 32-bit integer # ; (0 <= n < 4,294,967,296) num >= 0 && num < 4294967296 end # Check is passed argument valid 'nz_number' in RFC 3501 terminology def valid_nz_number?(num) # [RFC 3501] # nz-number = digit-nz DIGIT # ; Non-zero unsigned 32-bit integer # ; (0 < n < 4,294,967,296) num != 0 && valid_number?(num) end # Check is passed argument valid 'mod_sequence_value' in RFC 4551 terminology def valid_mod_sequence_value?(num) # mod-sequence-value = 1DIGIT # ; Positive unsigned 64-bit integer # ; (mod-sequence) # ; (1 <= n < 18,446,744,073,709,551,615) num >= 1 && num < 18446744073709551615 end # Ensure argument is 'number' or raise DataFormatError def ensure_number(num) return if valid_number?(num) msg = "number must be unsigned 32-bit integer: #{num}" raise DataFormatError, msg end # Ensure argument is 'nz_number' or raise DataFormatError def ensure_nz_number(num) return if valid_nz_number?(num) msg = "nz_number must be non-zero unsigned 32-bit integer: #{num}" raise DataFormatError, msg end # Ensure argument is 'mod_sequence_value' or raise DataFormatError def ensure_mod_sequence_value(num) return if valid_mod_sequence_value?(num) msg = "mod_sequence_value must be unsigned 64-bit integer: #{num}" raise DataFormatError, msg end end end # Net::IMAP::ContinuationRequest represents command continuation requests. # # The command continuation request response is indicated by a "+" token # instead of a tag. This form of response indicates that the server is # ready to accept the continuation of a command from the client. The # remainder of this response is a line of text. # # continue_req ::= "+" SPACE (resp_text / base64) # # ==== Fields: # # data:: Returns the data (Net::IMAP::ResponseText). # # raw_data:: Returns the raw data string. ContinuationRequest = Struct.new(:data, :raw_data) # Net::IMAP::UntaggedResponse represents untagged responses. # # Data transmitted by the server to the client and status responses # that do not indicate command completion are prefixed with the token # "", and are called untagged responses. # # response_data ::= "" SPACE (resp_cond_state / resp_cond_bye / # mailbox_data / message_data / capability_data) # # ==== Fields: # # name:: Returns the name, such as "FLAGS", "LIST", or "FETCH". # # data:: Returns the data such as an array of flag symbols, # a ((<Net::IMAP::MailboxList>)) object. # # raw_data:: Returns the raw data string. UntaggedResponse = Struct.new(:name, :data, :raw_data) # Net::IMAP::TaggedResponse represents tagged responses. # # The server completion result response indicates the success or # failure of the operation. It is tagged with the same tag as the # client command which began the operation. # # response_tagged ::= tag SPACE resp_cond_state CRLF # # tag ::= 1<any ATOM_CHAR except "+"> # # resp_cond_state ::= ("OK" / "NO" / "BAD") SPACE resp_text # # ==== Fields: # # tag:: Returns the tag. # # name:: Returns the name, one of "OK", "NO", or "BAD". # # data:: Returns the data. See ((<Net::IMAP::ResponseText>)). # # raw_data:: Returns the raw data string. # TaggedResponse = Struct.new(:tag, :name, :data, :raw_data) # Net::IMAP::ResponseText represents texts of responses. # The text may be prefixed by the response code. # # resp_text ::= ["[" resp_text_code "]" SPACE] (text_mime2 / text) # ;; text SHOULD NOT begin with "[" or "=" # # ==== Fields: # # code:: Returns the response code. See ((<Net::IMAP::ResponseCode>)). # # text:: Returns the text. # ResponseText = Struct.new(:code, :text) # Net::IMAP::ResponseCode represents response codes. # # resp_text_code ::= "ALERT" / "PARSE" / # "PERMANENTFLAGS" SPACE "(" #(flag / "\") ")" / # "READ-ONLY" / "READ-WRITE" / "TRYCREATE" / # "UIDVALIDITY" SPACE nz_number / # "UNSEEN" SPACE nz_number / # atom [SPACE 1<any TEXT_CHAR except "]">] # # ==== Fields: # # name:: Returns the name, such as "ALERT", "PERMANENTFLAGS", or "UIDVALIDITY". # # data:: Returns the data, if it exists. # ResponseCode = Struct.new(:name, :data) # Net::IMAP::MailboxList represents contents of the LIST response. # # mailbox_list ::= "(" #("\Marked" / "\Noinferiors" / # "\Noselect" / "\Unmarked" / flag_extension) ")" # SPACE (<"> QUOTED_CHAR <"> / nil) SPACE mailbox # # ==== Fields: # # attr:: Returns the name attributes. Each name attribute is a symbol # capitalized by String#capitalize, such as :Noselect (not :NoSelect). # # delim:: Returns the hierarchy delimiter. # # name:: Returns the mailbox name. # MailboxList = Struct.new(:attr, :delim, :name) # Net::IMAP::MailboxQuota represents contents of GETQUOTA response. # This object can also be a response to GETQUOTAROOT. In the syntax # specification below, the delimiter used with the "#" construct is a # single space (SPACE). # # quota_list ::= "(" #quota_resource ")" # # quota_resource ::= atom SPACE number SPACE number # # quota_response ::= "QUOTA" SPACE astring SPACE quota_list # # ==== Fields: # # mailbox:: The mailbox with the associated quota. # # usage:: Current storage usage of the mailbox. # # quota:: Quota limit imposed on the mailbox. # MailboxQuota = Struct.new(:mailbox, :usage, :quota) # Net::IMAP::MailboxQuotaRoot represents part of the GETQUOTAROOT # response. (GETQUOTAROOT can also return Net::IMAP::MailboxQuota.) # # quotaroot_response ::= "QUOTAROOT" SPACE astring (SPACE astring) # # ==== Fields: # # mailbox:: The mailbox with the associated quota. # # quotaroots:: Zero or more quotaroots that affect the quota on the # specified mailbox. # MailboxQuotaRoot = Struct.new(:mailbox, :quotaroots) # Net::IMAP::MailboxACLItem represents the response from GETACL. # # acl_data ::= "ACL" SPACE mailbox (SPACE identifier SPACE rights) # # identifier ::= astring # # rights ::= astring # # ==== Fields: # # user:: Login name that has certain rights to the mailbox # that was specified with the getacl command. # # rights:: The access rights the indicated user has to the # mailbox. # MailboxACLItem = Struct.new(:user, :rights, :mailbox) # Net::IMAP::StatusData represents the contents of the STATUS response. # # ==== Fields: # # mailbox:: Returns the mailbox name. # # attr:: Returns a hash. Each key is one of "MESSAGES", "RECENT", "UIDNEXT", # "UIDVALIDITY", "UNSEEN". Each value is a number. # StatusData = Struct.new(:mailbox, :attr) # Net::IMAP::FetchData represents the contents of the FETCH response. # # ==== Fields: # # seqno:: Returns the message sequence number. # (Note: not the unique identifier, even for the UID command response.) # # attr:: Returns a hash. Each key is a data item name, and each value is # its value. # # The current data items are: # # [BODY] # A form of BODYSTRUCTURE without extension data. # [BODY[<section>]<<origin_octet>>] # A string expressing the body contents of the specified section. # [BODYSTRUCTURE] # An object that describes the [MIME-IMB] body structure of a message. # See Net::IMAP::BodyTypeBasic, Net::IMAP::BodyTypeText, # Net::IMAP::BodyTypeMessage, Net::IMAP::BodyTypeMultipart. # [ENVELOPE] # A Net::IMAP::Envelope object that describes the envelope # structure of a message. # [FLAGS] # A array of flag symbols that are set for this message. Flag symbols # are capitalized by String#capitalize. # [INTERNALDATE] # A string representing the internal date of the message. # [RFC822] # Equivalent to BODY[]. # [RFC822.HEADER] # Equivalent to BODY.PEEK[HEADER]. # [RFC822.SIZE] # A number expressing the [RFC-822] size of the message. # [RFC822.TEXT] # Equivalent to BODY[TEXT]. # [UID] # A number expressing the unique identifier of the message. # FetchData = Struct.new(:seqno, :attr) # Net::IMAP::Envelope represents envelope structures of messages. # # ==== Fields: # # date:: Returns a string that represents the date. # # subject:: Returns a string that represents the subject. # # from:: Returns an array of Net::IMAP::Address that represents the from. # # sender:: Returns an array of Net::IMAP::Address that represents the sender. # # reply_to:: Returns an array of Net::IMAP::Address that represents the reply-to. # # to:: Returns an array of Net::IMAP::Address that represents the to. # # cc:: Returns an array of Net::IMAP::Address that represents the cc. # # bcc:: Returns an array of Net::IMAP::Address that represents the bcc. # # in_reply_to:: Returns a string that represents the in-reply-to. # # message_id:: Returns a string that represents the message-id. # Envelope = Struct.new(:date, :subject, :from, :sender, :reply_to, :to, :cc, :bcc, :in_reply_to, :message_id) # # Net::IMAP::Address represents electronic mail addresses. # # ==== Fields: # # name:: Returns the phrase from [RFC-822] mailbox. # # route:: Returns the route from [RFC-822] route-addr. # # mailbox:: nil indicates end of [RFC-822] group. # If non-nil and host is nil, returns [RFC-822] group name. # Otherwise, returns [RFC-822] local-part. # # host:: nil indicates [RFC-822] group syntax. # Otherwise, returns [RFC-822] domain name. # Address = Struct.new(:name, :route, :mailbox, :host) # # Net::IMAP::ContentDisposition represents Content-Disposition fields. # # ==== Fields: # # dsp_type:: Returns the disposition type. # # param:: Returns a hash that represents parameters of the Content-Disposition # field. # ContentDisposition = Struct.new(:dsp_type, :param) # Net::IMAP::ThreadMember represents a thread-node returned # by Net::IMAP#thread. # # ==== Fields: # # seqno:: The sequence number of this message. # # children:: An array of Net::IMAP::ThreadMember objects for mail # items that are children of this in the thread. # ThreadMember = Struct.new(:seqno, :children) # Net::IMAP::BodyTypeBasic represents basic body structures of messages. # # ==== Fields: # # media_type:: Returns the content media type name as defined in [MIME-IMB]. # # subtype:: Returns the content subtype name as defined in [MIME-IMB]. # # param:: Returns a hash that represents parameters as defined in [MIME-IMB]. # # content_id:: Returns a string giving the content id as defined in [MIME-IMB]. # # description:: Returns a string giving the content description as defined in # [MIME-IMB]. # # encoding:: Returns a string giving the content transfer encoding as defined in # [MIME-IMB]. # # size:: Returns a number giving the size of the body in octets. # # md5:: Returns a string giving the body MD5 value as defined in [MD5]. # # disposition:: Returns a Net::IMAP::ContentDisposition object giving # the content disposition. # # language:: Returns a string or an array of strings giving the body # language value as defined in [LANGUAGE-TAGS]. # # extension:: Returns extension data. # # multipart?:: Returns false. # class BodyTypeBasic < Struct.new(:media_type, :subtype, :param, :content_id, :description, :encoding, :size, :md5, :disposition, :language, :extension) def multipart? return false end # Obsolete: use +subtype+ instead. Calling this will # generate a warning message to +stderr+, then return # the value of +subtype+. def media_subtype warn("media_subtype is obsolete, use subtype instead.\n", uplevel: 1) return subtype end end # Net::IMAP::BodyTypeText represents TEXT body structures of messages. # # ==== Fields: # # lines:: Returns the size of the body in text lines. # # And Net::IMAP::BodyTypeText has all fields of Net::IMAP::BodyTypeBasic. # class BodyTypeText < Struct.new(:media_type, :subtype, :param, :content_id, :description, :encoding, :size, :lines, :md5, :disposition, :language, :extension) def multipart? return false end # Obsolete: use +subtype+ instead. Calling this will # generate a warning message to +stderr+, then return # the value of +subtype+. def media_subtype warn("media_subtype is obsolete, use subtype instead.\n", uplevel: 1) return subtype end end # Net::IMAP::BodyTypeMessage represents MESSAGE/RFC822 body structures of messages. # # ==== Fields: # # envelope:: Returns a Net::IMAP::Envelope giving the envelope structure. # # body:: Returns an object giving the body structure. # # And Net::IMAP::BodyTypeMessage has all methods of Net::IMAP::BodyTypeText. # class BodyTypeMessage < Struct.new(:media_type, :subtype, :param, :content_id, :description, :encoding, :size, :envelope, :body, :lines, :md5, :disposition, :language, :extension) def multipart? return false end # Obsolete: use +subtype+ instead. Calling this will # generate a warning message to +stderr+, then return # the value of +subtype+. def media_subtype warn("media_subtype is obsolete, use subtype instead.\n", uplevel: 1) return subtype end end # Net::IMAP::BodyTypeAttachment represents attachment body structures # of messages. # # ==== Fields: # # media_type:: Returns the content media type name. # # subtype:: Returns +nil+. # # param:: Returns a hash that represents parameters. # # multipart?:: Returns false. # class BodyTypeAttachment < Struct.new(:media_type, :subtype, :param) def multipart? return false end end # Net::IMAP::BodyTypeMultipart represents multipart body structures # of messages. # # ==== Fields: # # media_type:: Returns the content media type name as defined in [MIME-IMB]. # # subtype:: Returns the content subtype name as defined in [MIME-IMB]. # # parts:: Returns multiple parts. # # param:: Returns a hash that represents parameters as defined in [MIME-IMB]. # # disposition:: Returns a Net::IMAP::ContentDisposition object giving # the content disposition. # # language:: Returns a string or an array of strings giving the body # language value as defined in [LANGUAGE-TAGS]. # # extension:: Returns extension data. # # multipart?:: Returns true. # class BodyTypeMultipart < Struct.new(:media_type, :subtype, :parts, :param, :disposition, :language, :extension) def multipart? return true end # Obsolete: use +subtype+ instead. Calling this will # generate a warning message to +stderr+, then return # the value of +subtype+. def media_subtype warn("media_subtype is obsolete, use subtype instead.\n", uplevel: 1) return subtype end end class BodyTypeExtension < Struct.new(:media_type, :subtype, :params, :content_id, :description, :encoding, :size) def multipart? return false end end class ResponseParser # :nodoc: def initialize @str = nil @pos = nil @lex_state = nil @token = nil @flag_symbols = {} end def parse(str) @str = str @pos = 0 @lex_state = EXPR_BEG @token = nil return response end private EXPR_BEG = :EXPR_BEG EXPR_DATA = :EXPR_DATA EXPR_TEXT = :EXPR_TEXT EXPR_RTEXT = :EXPR_RTEXT EXPR_CTEXT = :EXPR_CTEXT T_SPACE = :SPACE T_NIL = :NIL T_NUMBER = :NUMBER T_ATOM = :ATOM T_QUOTED = :QUOTED T_LPAR = :LPAR T_RPAR = :RPAR T_BSLASH = :BSLASH T_STAR = :STAR T_LBRA = :LBRA T_RBRA = :RBRA T_LITERAL = :LITERAL T_PLUS = :PLUS T_PERCENT = :PERCENT T_CRLF = :CRLF T_EOF = :EOF T_TEXT = :TEXT BEG_REGEXP = /\G(?:\ (?# 1: SPACE )( +)\|\ (?# 2: NIL )(NIL)(?=[\x80-\xff(){ \x00-\x1f\x7f%"\\\[\]+])\|\ (?# 3: NUMBER )(\d+)(?=[\x80-\xff(){ \x00-\x1f\x7f%"\\\[\]+])\|\ (?# 4: ATOM )([^\x80-\xff(){ \x00-\x1f\x7f%"\\\[\]+]+)\|\ (?# 5: QUOTED )"((?:[^\x00\r\n"\\]\|\\["\\]))"\|\ (?# 6: LPAR )(\()\|\ (?# 7: RPAR )(\))\|\ (?# 8: BSLASH )(\\)\|\ (?# 9: STAR )(\)\|\ (?# 10: LBRA )(\[)\|\ (?# 11: RBRA )(\])\|\ (?# 12: LITERAL )\{(\d+)\}\r\n\|\ (?# 13: PLUS )(\+)\|\ (?# 14: PERCENT )(%)\|\ (?# 15: CRLF )(\r\n)\|\ (?# 16: EOF )(\z))/ni DATA_REGEXP = /\G(?:\ (?# 1: SPACE )( )\|\ (?# 2: NIL )(NIL)\|\ (?# 3: NUMBER )(\d+)\|\ (?# 4: QUOTED )"((?:[^\x00\r\n"\\]\|\\["\\]))"\|\ (?# 5: LITERAL )\{(\d+)\}\r\n\|\ (?# 6: LPAR )(\()\|\ (?# 7: RPAR )(\)))/ni TEXT_REGEXP = /\G(?:\ (?# 1: TEXT )([^\x00\r\n]))/ni RTEXT_REGEXP = /\G(?:\ (?# 1: LBRA )(\[)\|\ (?# 2: TEXT )([^\x00\r\n]))/ni CTEXT_REGEXP = /\G(?:\ (?# 1: TEXT )([^\x00\r\n\]]))/ni Token = Struct.new(:symbol, :value) def response token = lookahead case token.symbol when T_PLUS result = continue_req when T_STAR result = response_untagged else result = response_tagged end while lookahead.symbol == T_SPACE # Ignore trailing space for Microsoft Exchange Server shift_token end match(T_CRLF) match(T_EOF) return result end def continue_req match(T_PLUS) token = lookahead if token.symbol == T_SPACE shift_token return ContinuationRequest.new(resp_text, @str) else return ContinuationRequest.new(ResponseText.new(nil, ""), @str) end end def response_untagged match(T_STAR) match(T_SPACE) token = lookahead if token.symbol == T_NUMBER return numeric_response elsif token.symbol == T_ATOM case token.value when /\A(?:OK\|NO\|BAD\|BYE\|PREAUTH)\z/ni return response_cond when /\A(?:FLAGS)\z/ni return flags_response when /\A(?:LIST\|LSUB\|XLIST)\z/ni return list_response when /\A(?:QUOTA)\z/ni return getquota_response when /\A(?:QUOTAROOT)\z/ni return getquotaroot_response when /\A(?:ACL)\z/ni return getacl_response when /\A(?:SEARCH\|SORT)\z/ni return search_response when /\A(?:THREAD)\z/ni return thread_response when /\A(?:STATUS)\z/ni return status_response when /\A(?:CAPABILITY)\z/ni return capability_response else return text_response end else parse_error("unexpected token %s", token.symbol) end end def response_tagged tag = atom match(T_SPACE) token = match(T_ATOM) name = token.value.upcase match(T_SPACE) return TaggedResponse.new(tag, name, resp_text, @str) end def response_cond token = match(T_ATOM) name = token.value.upcase match(T_SPACE) return UntaggedResponse.new(name, resp_text, @str) end def numeric_response n = number match(T_SPACE) token = match(T_ATOM) name = token.value.upcase case name when "EXISTS", "RECENT", "EXPUNGE" return UntaggedResponse.new(name, n, @str) when "FETCH" shift_token match(T_SPACE) data = FetchData.new(n, msg_att(n)) return UntaggedResponse.new(name, data, @str) end end def msg_att(n) match(T_LPAR) attr = {} while true token = lookahead case token.symbol when T_RPAR shift_token break when T_SPACE shift_token next end case token.value when /\A(?:ENVELOPE)\z/ni name, val = envelope_data when /\A(?:FLAGS)\z/ni name, val = flags_data when /\A(?:INTERNALDATE)\z/ni name, val = internaldate_data when /\A(?:RFC822(?:\.HEADER\|\.TEXT)?)\z/ni name, val = rfc822_text when /\A(?:RFC822\.SIZE)\z/ni name, val = rfc822_size when /\A(?:BODY(?:STRUCTURE)?)\z/ni name, val = body_data when /\A(?:UID)\z/ni name, val = uid_data when /\A(?:MODSEQ)\z/ni name, val = modseq_data else parse_error("unknown attribute `%s' for {%d}", token.value, n) end attr[name] = val end return attr end def envelope_data token = match(T_ATOM) name = token.value.upcase match(T_SPACE) return name, envelope end def envelope @lex_state = EXPR_DATA token = lookahead if token.symbol == T_NIL shift_token result = nil else match(T_LPAR) date = nstring match(T_SPACE) subject = nstring match(T_SPACE) from = address_list match(T_SPACE) sender = address_list match(T_SPACE) reply_to = address_list match(T_SPACE) to = address_list match(T_SPACE) cc = address_list match(T_SPACE) bcc = address_list match(T_SPACE) in_reply_to = nstring match(T_SPACE) message_id = nstring match(T_RPAR) result = Envelope.new(date, subject, from, sender, reply_to, to, cc, bcc, in_reply_to, message_id) end @lex_state = EXPR_BEG return result end def flags_data token = match(T_ATOM) name = token.value.upcase match(T_SPACE) return name, flag_list end def internaldate_data token = match(T_ATOM) name = token.value.upcase match(T_SPACE) token = match(T_QUOTED) return name, token.value end def rfc822_text token = match(T_ATOM) name = token.value.upcase token = lookahead if token.symbol == T_LBRA shift_token match(T_RBRA) end match(T_SPACE) return name, nstring end def rfc822_size token = match(T_ATOM) name = token.value.upcase match(T_SPACE) return name, number end def body_data token = match(T_ATOM) name = token.value.upcase token = lookahead if token.symbol == T_SPACE shift_token return name, body end name.concat(section) token = lookahead if token.symbol == T_ATOM name.concat(token.value) shift_token end match(T_SPACE) data = nstring return name, data end def body @lex_state = EXPR_DATA token = lookahead if token.symbol == T_NIL shift_token result = nil else match(T_LPAR) token = lookahead if token.symbol == T_LPAR result = body_type_mpart else result = body_type_1part end match(T_RPAR) end @lex_state = EXPR_BEG return result end def body_type_1part token = lookahead case token.value when /\A(?:TEXT)\z/ni return body_type_text when /\A(?:MESSAGE)\z/ni return body_type_msg when /\A(?:ATTACHMENT)\z/ni return body_type_attachment when /\A(?:MIXED)\z/ni return body_type_mixed else return body_type_basic end end def body_type_basic mtype, msubtype = media_type token = lookahead if token.symbol == T_RPAR return BodyTypeBasic.new(mtype, msubtype) end match(T_SPACE) param, content_id, desc, enc, size = body_fields md5, disposition, language, extension = body_ext_1part return BodyTypeBasic.new(mtype, msubtype, param, content_id, desc, enc, size, md5, disposition, language, extension) end def body_type_text mtype, msubtype = media_type match(T_SPACE) param, content_id, desc, enc, size = body_fields match(T_SPACE) lines = number md5, disposition, language, extension = body_ext_1part return BodyTypeText.new(mtype, msubtype, param, content_id, desc, enc, size, lines, md5, disposition, language, extension) end def body_type_msg mtype, msubtype = media_type match(T_SPACE) param, content_id, desc, enc, size = body_fields token = lookahead if token.symbol == T_RPAR # If this is not message/rfc822, we shouldn't apply the RFC822 # spec to it. We should handle anything other than # message/rfc822 using multipart extension data [rfc3501] (i.e. # the data itself won't be returned, we would have to retrieve it # with BODYSTRUCTURE instead of with BODY # Also, sometimes a message/rfc822 is included as a large # attachment instead of having all of the other details # (e.g. attaching a .eml file to an email) if msubtype == "RFC822" return BodyTypeMessage.new(mtype, msubtype, param, content_id, desc, enc, size, nil, nil, nil, nil, nil, nil, nil) else return BodyTypeExtension.new(mtype, msubtype, param, content_id, desc, enc, size) end end match(T_SPACE) env = envelope match(T_SPACE) b = body match(T_SPACE) lines = number md5, disposition, language, extension = body_ext_1part return BodyTypeMessage.new(mtype, msubtype, param, content_id, desc, enc, size, env, b, lines, md5, disposition, language, extension) end def body_type_attachment mtype = case_insensitive_string match(T_SPACE) param = body_fld_param return BodyTypeAttachment.new(mtype, nil, param) end def body_type_mixed mtype = "MULTIPART" msubtype = case_insensitive_string param, disposition, language, extension = body_ext_mpart return BodyTypeBasic.new(mtype, msubtype, param, nil, nil, nil, nil, nil, disposition, language, extension) end def body_type_mpart parts = [] while true token = lookahead if token.symbol == T_SPACE shift_token break end parts.push(body) end mtype = "MULTIPART" msubtype = case_insensitive_string param, disposition, language, extension = body_ext_mpart return BodyTypeMultipart.new(mtype, msubtype, parts, param, disposition, language, extension) end def media_type mtype = case_insensitive_string token = lookahead if token.symbol != T_SPACE return mtype, nil end match(T_SPACE) msubtype = case_insensitive_string return mtype, msubtype end def body_fields param = body_fld_param match(T_SPACE) content_id = nstring match(T_SPACE) desc = nstring match(T_SPACE) enc = case_insensitive_string match(T_SPACE) size = number return param, content_id, desc, enc, size end def body_fld_param token = lookahead if token.symbol == T_NIL shift_token return nil end match(T_LPAR) param = {} while true token = lookahead case token.symbol when T_RPAR shift_token break when T_SPACE shift_token end name = case_insensitive_string match(T_SPACE) val = string param[name] = val end return param end def body_ext_1part token = lookahead if token.symbol == T_SPACE shift_token else return nil end md5 = nstring token = lookahead if token.symbol == T_SPACE shift_token else return md5 end disposition = body_fld_dsp token = lookahead if token.symbol == T_SPACE shift_token else return md5, disposition end language = body_fld_lang token = lookahead if token.symbol == T_SPACE shift_token else return md5, disposition, language end extension = body_extensions return md5, disposition, language, extension end def body_ext_mpart token = lookahead if token.symbol == T_SPACE shift_token else return nil end param = body_fld_param token = lookahead if token.symbol == T_SPACE shift_token else return param end disposition = body_fld_dsp token = lookahead if token.symbol == T_SPACE shift_token else return param, disposition end language = body_fld_lang token = lookahead if token.symbol == T_SPACE shift_token else return param, disposition, language end extension = body_extensions return param, disposition, language, extension end def body_fld_dsp token = lookahead if token.symbol == T_NIL shift_token return nil end match(T_LPAR) dsp_type = case_insensitive_string match(T_SPACE) param = body_fld_param match(T_RPAR) return ContentDisposition.new(dsp_type, param) end def body_fld_lang token = lookahead if token.symbol == T_LPAR shift_token result = [] while true token = lookahead case token.symbol when T_RPAR shift_token return result when T_SPACE shift_token end result.push(case_insensitive_string) end else lang = nstring if lang return lang.upcase else return lang end end end def body_extensions result = [] while true token = lookahead case token.symbol when T_RPAR return result when T_SPACE shift_token end result.push(body_extension) end end def body_extension token = lookahead case token.symbol when T_LPAR shift_token result = body_extensions match(T_RPAR) return result when T_NUMBER return number else return nstring end end def section str = String.new token = match(T_LBRA) str.concat(token.value) token = match(T_ATOM, T_NUMBER, T_RBRA) if token.symbol == T_RBRA str.concat(token.value) return str end str.concat(token.value) token = lookahead if token.symbol == T_SPACE shift_token str.concat(token.value) token = match(T_LPAR) str.concat(token.value) while true token = lookahead case token.symbol when T_RPAR str.concat(token.value) shift_token break when T_SPACE shift_token str.concat(token.value) end str.concat(format_string(astring)) end end token = match(T_RBRA) str.concat(token.value) return str end def format_string(str) case str when "" return '""' when /[\x80-\xff\r\n]/n # literal return "{" + str.bytesize.to_s + "}" + CRLF + str when /[(){ \x00-\x1f\x7f%"\\]/n # quoted string return '"' + str.gsub(/["\\]/n, "\\\\\\&") + '"' else # atom return str end end def uid_data token = match(T_ATOM) name = token.value.upcase match(T_SPACE) return name, number end def modseq_data token = match(T_ATOM) name = token.value.upcase match(T_SPACE) match(T_LPAR) modseq = number match(T_RPAR) return name, modseq end def text_response token = match(T_ATOM) name = token.value.upcase match(T_SPACE) @lex_state = EXPR_TEXT token = match(T_TEXT) @lex_state = EXPR_BEG return UntaggedResponse.new(name, token.value) end def flags_response token = match(T_ATOM) name = token.value.upcase match(T_SPACE) return UntaggedResponse.new(name, flag_list, @str) end def list_response token = match(T_ATOM) name = token.value.upcase match(T_SPACE) return UntaggedResponse.new(name, mailbox_list, @str) end def mailbox_list attr = flag_list match(T_SPACE) token = match(T_QUOTED, T_NIL) if token.symbol == T_NIL delim = nil else delim = token.value end match(T_SPACE) name = astring return MailboxList.new(attr, delim, name) end def getquota_response # If quota never established, get back # `NO Quota root does not exist'. # If quota removed, get `()' after the # folder spec with no mention of `STORAGE'. token = match(T_ATOM) name = token.value.upcase match(T_SPACE) mailbox = astring match(T_SPACE) match(T_LPAR) token = lookahead case token.symbol when T_RPAR shift_token data = MailboxQuota.new(mailbox, nil, nil) return UntaggedResponse.new(name, data, @str) when T_ATOM shift_token match(T_SPACE) token = match(T_NUMBER) usage = token.value match(T_SPACE) token = match(T_NUMBER) quota = token.value match(T_RPAR) data = MailboxQuota.new(mailbox, usage, quota) return UntaggedResponse.new(name, data, @str) else parse_error("unexpected token %s", token.symbol) end end def getquotaroot_response # Similar to getquota, but only admin can use getquota. token = match(T_ATOM) name = token.value.upcase match(T_SPACE) mailbox = astring quotaroots = [] while true token = lookahead break unless token.symbol == T_SPACE shift_token quotaroots.push(astring) end data = MailboxQuotaRoot.new(mailbox, quotaroots) return UntaggedResponse.new(name, data, @str) end def getacl_response token = match(T_ATOM) name = token.value.upcase match(T_SPACE) mailbox = astring data = [] token = lookahead if token.symbol == T_SPACE shift_token while true token = lookahead case token.symbol when T_CRLF break when T_SPACE shift_token end user = astring match(T_SPACE) rights = astring data.push(MailboxACLItem.new(user, rights, mailbox)) end end return UntaggedResponse.new(name, data, @str) end def search_response token = match(T_ATOM) name = token.value.upcase token = lookahead if token.symbol == T_SPACE shift_token data = [] while true token = lookahead case token.symbol when T_CRLF break when T_SPACE shift_token when T_NUMBER data.push(number) when T_LPAR # TODO: include the MODSEQ value in a response shift_token match(T_ATOM) match(T_SPACE) match(T_NUMBER) match(T_RPAR) end end else data = [] end return UntaggedResponse.new(name, data, @str) end def thread_response token = match(T_ATOM) name = token.value.upcase token = lookahead if token.symbol == T_SPACE threads = [] while true shift_token token = lookahead case token.symbol when T_LPAR threads << thread_branch(token) when T_CRLF break end end else # no member threads = [] end return UntaggedResponse.new(name, threads, @str) end def thread_branch(token) rootmember = nil lastmember = nil while true shift_token # ignore first T_LPAR token = lookahead case token.symbol when T_NUMBER # new member newmember = ThreadMember.new(number, []) if rootmember.nil? rootmember = newmember else lastmember.children << newmember end lastmember = newmember when T_SPACE # do nothing when T_LPAR if rootmember.nil? # dummy member lastmember = rootmember = ThreadMember.new(nil, []) end lastmember.children << thread_branch(token) when T_RPAR break end end return rootmember end def status_response token = match(T_ATOM) name = token.value.upcase match(T_SPACE) mailbox = astring match(T_SPACE) match(T_LPAR) attr = {} while true token = lookahead case token.symbol when T_RPAR shift_token break when T_SPACE shift_token end token = match(T_ATOM) key = token.value.upcase match(T_SPACE) val = number attr[key] = val end data = StatusData.new(mailbox, attr) return UntaggedResponse.new(name, data, @str) end def capability_response token = match(T_ATOM) name = token.value.upcase match(T_SPACE) data = [] while true token = lookahead case token.symbol when T_CRLF break when T_SPACE shift_token next end data.push(atom.upcase) end return UntaggedResponse.new(name, data, @str) end def resp_text @lex_state = EXPR_RTEXT token = lookahead if token.symbol == T_LBRA code = resp_text_code else code = nil end token = match(T_TEXT) @lex_state = EXPR_BEG return ResponseText.new(code, token.value) end def resp_text_code @lex_state = EXPR_BEG match(T_LBRA) token = match(T_ATOM) name = token.value.upcase case name when /\A(?:ALERT\|PARSE\|READ-ONLY\|READ-WRITE\|TRYCREATE\|NOMODSEQ)\z/n result = ResponseCode.new(name, nil) when /\A(?:PERMANENTFLAGS)\z/n match(T_SPACE) result = ResponseCode.new(name, flag_list) when /\A(?:UIDVALIDITY\|UIDNEXT\|UNSEEN)\z/n match(T_SPACE) result = ResponseCode.new(name, number) else token = lookahead if token.symbol == T_SPACE shift_token @lex_state = EXPR_CTEXT token = match(T_TEXT) @lex_state = EXPR_BEG result = ResponseCode.new(name, token.value) else result = ResponseCode.new(name, nil) end end match(T_RBRA) @lex_state = EXPR_RTEXT return result end def address_list token = lookahead if token.symbol == T_NIL shift_token return nil else result = [] match(T_LPAR) while true token = lookahead case token.symbol when T_RPAR shift_token break when T_SPACE shift_token end result.push(address) end return result end end ADDRESS_REGEXP = /\G\ (?# 1: NAME )(?:NIL\|"((?:[^\x80-\xff\x00\r\n"\\]\|\\["\\]))") \ (?# 2: ROUTE )(?:NIL\|"((?:[^\x80-\xff\x00\r\n"\\]\|\\["\\]))") \ (?# 3: MAILBOX )(?:NIL\|"((?:[^\x80-\xff\x00\r\n"\\]\|\\["\\]))") \ (?# 4: HOST )(?:NIL\|"((?:[^\x80-\xff\x00\r\n"\\]\|\\["\\]))")\ \)/ni def address match(T_LPAR) if @str.index(ADDRESS_REGEXP, @pos) # address does not include literal. @pos = $~.end(0) name = $1 route = $2 mailbox = $3 host = $4 for s in [name, route, mailbox, host] if s s.gsub!(/\\(["\\])/n, "\\1") end end else name = nstring match(T_SPACE) route = nstring match(T_SPACE) mailbox = nstring match(T_SPACE) host = nstring match(T_RPAR) end return Address.new(name, route, mailbox, host) end FLAG_REGEXP = /\ (?# FLAG )\\([^\x80-\xff(){ \x00-\x1f\x7f%"\\]+)\|\ (?# ATOM )([^\x80-\xff(){ \x00-\x1f\x7f%"\\]+)/n def flag_list if @str.index(/\(([^)])\)/ni, @pos) @pos = $~.end(0) return $1.scan(FLAG_REGEXP).collect { \|flag, atom\| if atom atom else symbol = flag.capitalize.intern @flag_symbols[symbol] = true if @flag_symbols.length > IMAP.max_flag_count raise FlagCountError, "number of flag symbols exceeded" end symbol end } else parse_error("invalid flag list") end end def nstring token = lookahead if token.symbol == T_NIL shift_token return nil else return string end end def astring token = lookahead if string_token?(token) return string else return atom end end def string token = lookahead if token.symbol == T_NIL shift_token return nil end token = match(T_QUOTED, T_LITERAL) return token.value end STRING_TOKENS = [T_QUOTED, T_LITERAL, T_NIL] def string_token?(token) return STRING_TOKENS.include?(token.symbol) end def case_insensitive_string token = lookahead if token.symbol == T_NIL shift_token return nil end token = match(T_QUOTED, T_LITERAL) return token.value.upcase end def atom result = String.new while true token = lookahead if atom_token?(token) result.concat(token.value) shift_token else if result.empty? parse_error("unexpected token %s", token.symbol) else return result end end end end ATOM_TOKENS = [ T_ATOM, T_NUMBER, T_NIL, T_LBRA, T_RBRA, T_PLUS ] def atom_token?(token) return ATOM_TOKENS.include?(token.symbol) end def number token = lookahead if token.symbol == T_NIL shift_token return nil end token = match(T_NUMBER) return token.value.to_i end def nil_atom match(T_NIL) return nil end def match(args) token = lookahead unless args.include?(token.symbol) parse_error('unexpected token %s (expected %s)', token.symbol.id2name, args.collect {\|i\| i.id2name}.join(" or ")) end shift_token return token end def lookahead unless @token @token = next_token end return @token end def shift_token @token = nil end def next_token case @lex_state when EXPR_BEG if @str.index(BEG_REGEXP, @pos) @pos = $~.end(0) if $1 return Token.new(T_SPACE, $+) elsif $2 return Token.new(T_NIL, $+) elsif $3 return Token.new(T_NUMBER, $+) elsif $4 return Token.new(T_ATOM, $+) elsif $5 return Token.new(T_QUOTED, $+.gsub(/\\(["\\])/n, "\\1")) elsif $6 return Token.new(T_LPAR, $+) elsif $7 return Token.new(T_RPAR, $+) elsif $8 return Token.new(T_BSLASH, $+) elsif $9 return Token.new(T_STAR, $+) elsif $10 return Token.new(T_LBRA, $+) elsif $11 return Token.new(T_RBRA, $+) elsif $12 len = $+.to_i val = @str[@pos, len] @pos += len return Token.new(T_LITERAL, val) elsif $13 return Token.new(T_PLUS, $+) elsif $14 return Token.new(T_PERCENT, $+) elsif $15 return Token.new(T_CRLF, $+) elsif $16 return Token.new(T_EOF, $+) else parse_error("[Net::IMAP BUG] BEG_REGEXP is invalid") end else @str.index(/\S/n, @pos) parse_error("unknown token - %s", $&.dump) end when EXPR_DATA if @str.index(DATA_REGEXP, @pos) @pos = $~.end(0) if $1 return Token.new(T_SPACE, $+) elsif $2 return Token.new(T_NIL, $+) elsif $3 return Token.new(T_NUMBER, $+) elsif $4 return Token.new(T_QUOTED, $+.gsub(/\\(["\\])/n, "\\1")) elsif $5 len = $+.to_i val = @str[@pos, len] @pos += len return Token.new(T_LITERAL, val) elsif $6 return Token.new(T_LPAR, $+) elsif $7 return Token.new(T_RPAR, $+) else parse_error("[Net::IMAP BUG] DATA_REGEXP is invalid") end else @str.index(/\S/n, @pos) parse_error("unknown token - %s", $&.dump) end when EXPR_TEXT if @str.index(TEXT_REGEXP, @pos) @pos = $~.end(0) if $1 return Token.new(T_TEXT, $+) else parse_error("[Net::IMAP BUG] TEXT_REGEXP is invalid") end else @str.index(/\S/n, @pos) parse_error("unknown token - %s", $&.dump) end when EXPR_RTEXT if @str.index(RTEXT_REGEXP, @pos) @pos = $~.end(0) if $1 return Token.new(T_LBRA, $+) elsif $2 return Token.new(T_TEXT, $+) else parse_error("[Net::IMAP BUG] RTEXT_REGEXP is invalid") end else @str.index(/\S/n, @pos) parse_error("unknown token - %s", $&.dump) end when EXPR_CTEXT if @str.index(CTEXT_REGEXP, @pos) @pos = $~.end(0) if $1 return Token.new(T_TEXT, $+) else parse_error("[Net::IMAP BUG] CTEXT_REGEXP is invalid") end else @str.index(/\S/n, @pos) #/ parse_error("unknown token - %s", $&.dump) end else parse_error("invalid @lex_state - %s", @lex_state.inspect) end end def parse_error(fmt, args) if IMAP.debug $stderr.printf("@str: %s\n", @str.dump) $stderr.printf("@pos: %d\n", @pos) $stderr.printf("@lex_state: %s\n", @lex_state) if @token $stderr.printf("@token.symbol: %s\n", @token.symbol) $stderr.printf("@token.value: %s\n", @token.value.inspect) end end raise ResponseParseError, format(fmt, args) end end # Authenticator for the "LOGIN" authentication type. See # #authenticate(). class LoginAuthenticator def process(data) case @state when STATE_USER @state = STATE_PASSWORD return @user when STATE_PASSWORD return @password end end private STATE_USER = :USER STATE_PASSWORD = :PASSWORD def initialize(user, password) @user = user @password = password @state = STATE_USER end end add_authenticator "LOGIN", LoginAuthenticator # Authenticator for the "PLAIN" authentication type. See # #authenticate(). class PlainAuthenticator def process(data) return "\0#{@user}\0#{@password}" end private def initialize(user, password) @user = user @password = password end end add_authenticator "PLAIN", PlainAuthenticator # Authenticator for the "CRAM-MD5" authentication type. See # #authenticate(). class CramMD5Authenticator def process(challenge) digest = hmac_md5(challenge, @password) return @user + " " + digest end private def initialize(user, password) @user = user @password = password end def hmac_md5(text, key) if key.length > 64 key = Digest::MD5.digest(key) end k_ipad = key + "\0" * (64 - key.length) k_opad = key + "\0" * (64 - key.length) for i in 0..63 k_ipad[i] = (k_ipad[i].ord ^ 0x36).chr k_opad[i] = (k_opad[i].ord ^ 0x5c).chr end digest = Digest::MD5.digest(k_ipad + text) return Digest::MD5.hexdigest(k_opad + digest) end end add_authenticator "CRAM-MD5", CramMD5Authenticator # Authenticator for the "DIGEST-MD5" authentication type. See # #authenticate(). class DigestMD5Authenticator def process(challenge) case @stage when STAGE_ONE @stage = STAGE_TWO sparams = {} c = StringScanner.new(challenge) while c.scan(/(?:\s,)?\s(\w+)=("(?:[^\\"]+\|\\.)"\|[^,]+)\s/) k, v = c[1], c[2] if v =~ /^"(.*)"$/ v = $1 if v =~ /,/ v = v.split(',') end end sparams[k] = v end raise DataFormatError, "Bad Challenge: '#{challenge}'" unless c.rest.size == 0 raise Error, "Server does not support auth (qop = #{sparams['qop'].join(',')})" unless sparams['qop'].include?("auth") response = { :nonce => sparams['nonce'], :username => @user, :realm => sparams['realm'], :cnonce => Digest::MD5.hexdigest("%.15f:%.15f:%d" % [Time.now.to_f, rand, Process.pid.to_s]), :'digest-uri' => 'imap/' + sparams['realm'], :qop => 'auth', :maxbuf => 65535, :nc => "%08d" % nc(sparams['nonce']), :charset => sparams['charset'], } response[:authzid] = @authname unless @authname.nil? # now, the real thing a0 = Digest::MD5.digest( [ response.values_at(:username, :realm), @password ].join(':') ) a1 = [ a0, response.values_at(:nonce,:cnonce) ].join(':') a1 << ':' + response[:authzid] unless response[:authzid].nil? a2 = "AUTHENTICATE:" + response[:'digest-uri'] a2 << ":00000000000000000000000000000000" if response[:qop] and response[:qop] =~ /^auth-(?:conf\|int)$/ response[:response] = Digest::MD5.hexdigest( [ Digest::MD5.hexdigest(a1), response.values_at(:nonce, :nc, :cnonce, :qop), Digest::MD5.hexdigest(a2) ].join(':') ) return response.keys.map {\|key\| qdval(key.to_s, response[key]) }.join(',') when STAGE_TWO @stage = nil # if at the second stage, return an empty string if challenge =~ /rspauth=/ return '' else raise ResponseParseError, challenge end else raise ResponseParseError, challenge end end def initialize(user, password, authname = nil) @user, @password, @authname = user, password, authname @nc, @stage = {}, STAGE_ONE end private STAGE_ONE = :stage_one STAGE_TWO = :stage_two def nc(nonce) if @nc.has_key? nonce @nc[nonce] = @nc[nonce] + 1 else @nc[nonce] = 1 end return @nc[nonce] end # some responses need quoting def qdval(k, v) return if k.nil? or v.nil? if %w"username authzid realm nonce cnonce digest-uri qop".include? k v.gsub!(/([\\"])/, "\\\1") return '%s="%s"' % [k, v] else return '%s=%s' % [k, v] end end end add_authenticator "DIGEST-MD5", DigestMD5Authenticator # Superclass of IMAP errors. class Error < StandardError end # Error raised when data is in the incorrect format. class DataFormatError < Error end # Error raised when a response from the server is non-parseable. class ResponseParseError < Error end # Superclass of all errors used to encapsulate "fail" responses # from the server. class ResponseError < Error # The response that caused this error attr_accessor :response def initialize(response) @response = response super @response.data.text end end # Error raised upon a "NO" response from the server, indicating # that the client command could not be completed successfully. class NoResponseError < ResponseError end # Error raised upon a "BAD" response from the server, indicating # that the client command violated the IMAP protocol, or an internal # server failure has occurred. class BadResponseError < ResponseError end # Error raised upon a "BYE" response from the server, indicating # that the client is not being allowed to login, or has been timed # out due to inactivity. class ByeResponseError < ResponseError end # Error raised upon an unknown response from the server. class UnknownResponseError < ResponseError end RESPONSE_ERRORS = Hash.new(ResponseError) RESPONSE_ERRORS["NO"] = NoResponseError RESPONSE_ERRORS["BAD"] = BadResponseError # Error raised when too many flags are interned to symbols. class FlagCountError < Error end end end Back

Edit File : imap.rb | Size : 111.13 KB

# frozen_string_literal: true
#
# = net/imap.rb
#
# Copyright (C) 2000  Shugo Maeda <shugo@ruby-lang.org>
#
# This library is distributed under the terms of the Ruby license.
# You can freely distribute/modify this library.
#
# Documentation: Shugo Maeda, with RDoc conversion and overview by William
# Webber.
#
# See Net::IMAP for documentation.
#

require "socket"
require "monitor"
require "digest/md5"
require "strscan"
require 'net/protocol'
begin
  require "openssl"
rescue LoadError
end

module Net

#
  # Net::IMAP implements Internet Message Access Protocol (IMAP) client
  # functionality.  The protocol is described in [IMAP].
  #
  # == IMAP Overview
  #
  # An IMAP client connects to a server, and then authenticates
  # itself using either #authenticate() or #login().  Having
  # authenticated itself, there is a range of commands
  # available to it.  Most work with mailboxes, which may be
  # arranged in an hierarchical namespace, and each of which
  # contains zero or more messages.  How this is implemented on
  # the server is implementation-dependent; on a UNIX server, it
  # will frequently be implemented as files in mailbox format
  # within a hierarchy of directories.
  #
  # To work on the messages within a mailbox, the client must
  # first select that mailbox, using either #select() or (for
  # read-only access) #examine().  Once the client has successfully
  # selected a mailbox, they enter _selected_ state, and that
  # mailbox becomes the _current_ mailbox, on which mail-item
  # related commands implicitly operate.
  #
  # Messages have two sorts of identifiers: message sequence
  # numbers and UIDs.
  #
  # Message sequence numbers number messages within a mailbox
  # from 1 up to the number of items in the mailbox.  If a new
  # message arrives during a session, it receives a sequence
  # number equal to the new size of the mailbox.  If messages
  # are expunged from the mailbox, remaining messages have their
  # sequence numbers "shuffled down" to fill the gaps.
  #
  # UIDs, on the other hand, are permanently guaranteed not to
  # identify another message within the same mailbox, even if
  # the existing message is deleted.  UIDs are required to
  # be assigned in ascending (but not necessarily sequential)
  # order within a mailbox; this means that if a non-IMAP client
  # rearranges the order of mailitems within a mailbox, the
  # UIDs have to be reassigned.  An IMAP client thus cannot
  # rearrange message orders.
  #
  # == Examples of Usage
  #
  # === List sender and subject of all recent messages in the default mailbox
  #
  #   imap = Net::IMAP.new('mail.example.com')
  #   imap.authenticate('LOGIN', 'joe_user', 'joes_password')
  #   imap.examine('INBOX')
  #   imap.search(["RECENT"]).each do |message_id|
  #     envelope = imap.fetch(message_id, "ENVELOPE")[0].attr["ENVELOPE"]
  #     puts "#{envelope.from[0].name}: \t#{envelope.subject}"
  #   end
  #
  # === Move all messages from April 2003 from "Mail/sent-mail" to "Mail/sent-apr03"
  #
  #   imap = Net::IMAP.new('mail.example.com')
  #   imap.authenticate('LOGIN', 'joe_user', 'joes_password')
  #   imap.select('Mail/sent-mail')
  #   if not imap.list('Mail/', 'sent-apr03')
  #     imap.create('Mail/sent-apr03')
  #   end
  #   imap.search(["BEFORE", "30-Apr-2003", "SINCE", "1-Apr-2003"]).each do |message_id|
  #     imap.copy(message_id, "Mail/sent-apr03")
  #     imap.store(message_id, "+FLAGS", [:Deleted])
  #   end
  #   imap.expunge
  #
  # == Thread Safety
  #
  # Net::IMAP supports concurrent threads. For example,
  #
  #   imap = Net::IMAP.new("imap.foo.net", "imap2")
  #   imap.authenticate("cram-md5", "bar", "password")
  #   imap.select("inbox")
  #   fetch_thread = Thread.start { imap.fetch(1..-1, "UID") }
  #   search_result = imap.search(["BODY", "hello"])
  #   fetch_result = fetch_thread.value
  #   imap.disconnect
  #
  # This script invokes the FETCH command and the SEARCH command concurrently.
  #
  # == Errors
  #
  # An IMAP server can send three different types of responses to indicate
  # failure:
  #
  # NO:: the attempted command could not be successfully completed.  For
  #      instance, the username/password used for logging in are incorrect;
  #      the selected mailbox does not exist; etc.
  #
  # BAD:: the request from the client does not follow the server's
  #       understanding of the IMAP protocol.  This includes attempting
  #       commands from the wrong client state; for instance, attempting
  #       to perform a SEARCH command without having SELECTed a current
  #       mailbox.  It can also signal an internal server
  #       failure (such as a disk crash) has occurred.
  #
  # BYE:: the server is saying goodbye.  This can be part of a normal
  #       logout sequence, and can be used as part of a login sequence
  #       to indicate that the server is (for some reason) unwilling
  #       to accept your connection.  As a response to any other command,
  #       it indicates either that the server is shutting down, or that
  #       the server is timing out the client connection due to inactivity.
  #
  # These three error response are represented by the errors
  # Net::IMAP::NoResponseError, Net::IMAP::BadResponseError, and
  # Net::IMAP::ByeResponseError, all of which are subclasses of
  # Net::IMAP::ResponseError.  Essentially, all methods that involve
  # sending a request to the server can generate one of these errors.
  # Only the most pertinent instances have been documented below.
  #
  # Because the IMAP class uses Sockets for communication, its methods
  # are also susceptible to the various errors that can occur when
  # working with sockets.  These are generally represented as
  # Errno errors.  For instance, any method that involves sending a
  # request to the server and/or receiving a response from it could
  # raise an Errno::EPIPE error if the network connection unexpectedly
  # goes down.  See the socket(7), ip(7), tcp(7), socket(2), connect(2),
  # and associated man pages.
  #
  # Finally, a Net::IMAP::DataFormatError is thrown if low-level data
  # is found to be in an incorrect format (for instance, when converting
  # between UTF-8 and UTF-16), and Net::IMAP::ResponseParseError is
  # thrown if a server response is non-parseable.
  #
  #
  # == References
  #
  # [[IMAP]]
  #    M. Crispin, "INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1",
  #    RFC 2060, December 1996.  (Note: since obsoleted by RFC 3501)
  #
  # [[LANGUAGE-TAGS]]
  #    Alvestrand, H., "Tags for the Identification of
  #    Languages", RFC 1766, March 1995.
  #
  # [[MD5]]
  #    Myers, J., and M. Rose, "The Content-MD5 Header Field", RFC
  #    1864, October 1995.
  #
  # [[MIME-IMB]]
  #    Freed, N., and N. Borenstein, "MIME (Multipurpose Internet
  #    Mail Extensions) Part One: Format of Internet Message Bodies", RFC
  #    2045, November 1996.
  #
  # [[RFC-822]]
  #    Crocker, D., "Standard for the Format of ARPA Internet Text
  #    Messages", STD 11, RFC 822, University of Delaware, August 1982.
  #
  # [[RFC-2087]]
  #    Myers, J., "IMAP4 QUOTA extension", RFC 2087, January 1997.
  #
  # [[RFC-2086]]
  #    Myers, J., "IMAP4 ACL extension", RFC 2086, January 1997.
  #
  # [[RFC-2195]]
  #    Klensin, J., Catoe, R., and Krumviede, P., "IMAP/POP AUTHorize Extension
  #    for Simple Challenge/Response", RFC 2195, September 1997.
  #
  # [[SORT-THREAD-EXT]]
  #    Crispin, M., "INTERNET MESSAGE ACCESS PROTOCOL - SORT and THREAD
  #    Extensions", draft-ietf-imapext-sort, May 2003.
  #
  # [[OSSL]]
  #    http://www.openssl.org
  #
  # [[RSSL]]
  #    http://savannah.gnu.org/projects/rubypki
  #
  # [[UTF7]]
  #    Goldsmith, D. and Davis, M., "UTF-7: A Mail-Safe Transformation Format of
  #    Unicode", RFC 2152, May 1997.
  #
  class IMAP < Protocol
    VERSION = "0.1.1"

include MonitorMixin
    if defined?(OpenSSL::SSL)
      include OpenSSL
      include SSL
    end

#  Returns an initial greeting response from the server.
    attr_reader :greeting

# Returns recorded untagged responses.  For example:
    #
    #   imap.select("inbox")
    #   p imap.responses["EXISTS"][-1]
    #   #=> 2
    #   p imap.responses["UIDVALIDITY"][-1]
    #   #=> 968263756
    attr_reader :responses

# Returns all response handlers.
    attr_reader :response_handlers

# Seconds to wait until a connection is opened.
    # If the IMAP object cannot open a connection within this time,
    # it raises a Net::OpenTimeout exception. The default value is 30 seconds.
    attr_reader :open_timeout

# The thread to receive exceptions.
    attr_accessor :client_thread

# Flag indicating a message has been seen.
    SEEN = :Seen

# Flag indicating a message has been answered.
    ANSWERED = :Answered

# Flag indicating a message has been flagged for special or urgent
    # attention.
    FLAGGED = :Flagged

# Flag indicating a message has been marked for deletion.  This
    # will occur when the mailbox is closed or expunged.
    DELETED = :Deleted

# Flag indicating a message is only a draft or work-in-progress version.
    DRAFT = :Draft

# Flag indicating that the message is "recent," meaning that this
    # session is the first session in which the client has been notified
    # of this message.
    RECENT = :Recent

# Flag indicating that a mailbox context name cannot contain
    # children.
    NOINFERIORS = :Noinferiors

# Flag indicating that a mailbox is not selected.
    NOSELECT = :Noselect

# Flag indicating that a mailbox has been marked "interesting" by
    # the server; this commonly indicates that the mailbox contains
    # new messages.
    MARKED = :Marked

# Flag indicating that the mailbox does not contains new messages.
    UNMARKED = :Unmarked

# Returns the debug mode.
    def self.debug
      return @@debug
    end

# Sets the debug mode.
    def self.debug=(val)
      return @@debug = val
    end

# Returns the max number of flags interned to symbols.
    def self.max_flag_count
      return @@max_flag_count
    end

# Sets the max number of flags interned to symbols.
    def self.max_flag_count=(count)
      @@max_flag_count = count
    end

# Adds an authenticator for Net::IMAP#authenticate.  +auth_type+
    # is the type of authentication this authenticator supports
    # (for instance, "LOGIN").  The +authenticator+ is an object
    # which defines a process() method to handle authentication with
    # the server.  See Net::IMAP::LoginAuthenticator,
    # Net::IMAP::CramMD5Authenticator, and Net::IMAP::DigestMD5Authenticator
    # for examples.
    #
    #
    # If +auth_type+ refers to an existing authenticator, it will be
    # replaced by the new one.
    def self.add_authenticator(auth_type, authenticator)
      @@authenticators[auth_type] = authenticator
    end

# The default port for IMAP connections, port 143
    def self.default_port
      return PORT
    end

# The default port for IMAPS connections, port 993
    def self.default_tls_port
      return SSL_PORT
    end

class << self
      alias default_imap_port default_port
      alias default_imaps_port default_tls_port
      alias default_ssl_port default_tls_port
    end

# Disconnects from the server.
    def disconnect
      return if disconnected?
      begin
        begin
          # try to call SSL::SSLSocket#io.
          @sock.io.shutdown
        rescue NoMethodError
          # @sock is not an SSL::SSLSocket.
          @sock.shutdown
        end
      rescue Errno::ENOTCONN
        # ignore `Errno::ENOTCONN: Socket is not connected' on some platforms.
      rescue Exception => e
        @receiver_thread.raise(e)
      end
      @receiver_thread.join
      synchronize do
        @sock.close
      end
      raise e if e
    end

# Returns true if disconnected from the server.
    def disconnected?
      return @sock.closed?
    end

# Sends a CAPABILITY command, and returns an array of
    # capabilities that the server supports.  Each capability
    # is a string.  See [IMAP] for a list of possible
    # capabilities.
    #
    # Note that the Net::IMAP class does not modify its
    # behaviour according to the capabilities of the server;
    # it is up to the user of the class to ensure that
    # a certain capability is supported by a server before
    # using it.
    def capability
      synchronize do
        send_command("CAPABILITY")
        return @responses.delete("CAPABILITY")[-1]
      end
    end

# Sends a NOOP command to the server. It does nothing.
    def noop
      send_command("NOOP")
    end

# Sends a LOGOUT command to inform the server that the client is
    # done with the connection.
    def logout
      send_command("LOGOUT")
    end

# Sends a STARTTLS command to start TLS session.
    def starttls(options = {}, verify = true)
      send_command("STARTTLS") do |resp|
        if resp.kind_of?(TaggedResponse) && resp.name == "OK"
          begin
            # for backward compatibility
            certs = options.to_str
            options = create_ssl_params(certs, verify)
          rescue NoMethodError
          end
          start_tls_session(options)
        end
      end
    end

# Sends an AUTHENTICATE command to authenticate the client.
    # The +auth_type+ parameter is a string that represents
    # the authentication mechanism to be used. Currently Net::IMAP
    # supports the authentication mechanisms:
    #
    #   LOGIN:: login using cleartext user and password.
    #   CRAM-MD5:: login with cleartext user and encrypted password
    #              (see [RFC-2195] for a full description).  This
    #              mechanism requires that the server have the user's
    #              password stored in clear-text password.
    #
    # For both of these mechanisms, there should be two +args+: username
    # and (cleartext) password.  A server may not support one or the other
    # of these mechanisms; check #capability() for a capability of
    # the form "AUTH=LOGIN" or "AUTH=CRAM-MD5".
    #
    # Authentication is done using the appropriate authenticator object:
    # see @@authenticators for more information on plugging in your own
    # authenticator.
    #
    # For example:
    #
    #    imap.authenticate('LOGIN', user, password)
    #
    # A Net::IMAP::NoResponseError is raised if authentication fails.
    def authenticate(auth_type, *args)
      auth_type = auth_type.upcase
      unless @@authenticators.has_key?(auth_type)
        raise ArgumentError,
          format('unknown auth type - "%s"', auth_type)
      end
      authenticator = @@authenticators[auth_type].new(*args)
      send_command("AUTHENTICATE", auth_type) do |resp|
        if resp.instance_of?(ContinuationRequest)
          data = authenticator.process(resp.data.text.unpack("m")[0])
          s = [data].pack("m0")
          send_string_data(s)
          put_string(CRLF)
        end
      end
    end

# Sends a LOGIN command to identify the client and carries
    # the plaintext +password+ authenticating this +user+.  Note
    # that, unlike calling #authenticate() with an +auth_type+
    # of "LOGIN", #login() does *not* use the login authenticator.
    #
    # A Net::IMAP::NoResponseError is raised if authentication fails.
    def login(user, password)
      send_command("LOGIN", user, password)
    end

# Sends a SELECT command to select a +mailbox+ so that messages
    # in the +mailbox+ can be accessed.
    #
    # After you have selected a mailbox, you may retrieve the
    # number of items in that mailbox from @responses["EXISTS"][-1],
    # and the number of recent messages from @responses["RECENT"][-1].
    # Note that these values can change if new messages arrive
    # during a session; see #add_response_handler() for a way of
    # detecting this event.
    #
    # A Net::IMAP::NoResponseError is raised if the mailbox does not
    # exist or is for some reason non-selectable.
    def select(mailbox)
      synchronize do
        @responses.clear
        send_command("SELECT", mailbox)
      end
    end

# Sends a EXAMINE command to select a +mailbox+ so that messages
    # in the +mailbox+ can be accessed.  Behaves the same as #select(),
    # except that the selected +mailbox+ is identified as read-only.
    #
    # A Net::IMAP::NoResponseError is raised if the mailbox does not
    # exist or is for some reason non-examinable.
    def examine(mailbox)
      synchronize do
        @responses.clear
        send_command("EXAMINE", mailbox)
      end
    end

# Sends a CREATE command to create a new +mailbox+.
    #
    # A Net::IMAP::NoResponseError is raised if a mailbox with that name
    # cannot be created.
    def create(mailbox)
      send_command("CREATE", mailbox)
    end

# Sends a DELETE command to remove the +mailbox+.
    #
    # A Net::IMAP::NoResponseError is raised if a mailbox with that name
    # cannot be deleted, either because it does not exist or because the
    # client does not have permission to delete it.
    def delete(mailbox)
      send_command("DELETE", mailbox)
    end

# Sends a RENAME command to change the name of the +mailbox+ to
    # +newname+.
    #
    # A Net::IMAP::NoResponseError is raised if a mailbox with the
    # name +mailbox+ cannot be renamed to +newname+ for whatever
    # reason; for instance, because +mailbox+ does not exist, or
    # because there is already a mailbox with the name +newname+.
    def rename(mailbox, newname)
      send_command("RENAME", mailbox, newname)
    end

# Sends a SUBSCRIBE command to add the specified +mailbox+ name to
    # the server's set of "active" or "subscribed" mailboxes as returned
    # by #lsub().
    #
    # A Net::IMAP::NoResponseError is raised if +mailbox+ cannot be
    # subscribed to; for instance, because it does not exist.
    def subscribe(mailbox)
      send_command("SUBSCRIBE", mailbox)
    end

# Sends a UNSUBSCRIBE command to remove the specified +mailbox+ name
    # from the server's set of "active" or "subscribed" mailboxes.
    #
    # A Net::IMAP::NoResponseError is raised if +mailbox+ cannot be
    # unsubscribed from; for instance, because the client is not currently
    # subscribed to it.
    def unsubscribe(mailbox)
      send_command("UNSUBSCRIBE", mailbox)
    end

# Sends a LIST command, and returns a subset of names from
    # the complete set of all names available to the client.
    # +refname+ provides a context (for instance, a base directory
    # in a directory-based mailbox hierarchy).  +mailbox+ specifies
    # a mailbox or (via wildcards) mailboxes under that context.
    # Two wildcards may be used in +mailbox+: '*', which matches
    # all characters *including* the hierarchy delimiter (for instance,
    # '/' on a UNIX-hosted directory-based mailbox hierarchy); and '%',
    # which matches all characters *except* the hierarchy delimiter.
    #
    # If +refname+ is empty, +mailbox+ is used directly to determine
    # which mailboxes to match.  If +mailbox+ is empty, the root
    # name of +refname+ and the hierarchy delimiter are returned.
    #
    # The return value is an array of +Net::IMAP::MailboxList+. For example:
    #
    #   imap.create("foo/bar")
    #   imap.create("foo/baz")
    #   p imap.list("", "foo/%")
    #   #=> [#<Net::IMAP::MailboxList attr=[:Noselect], delim="/", name="foo/">, \\
    #        #<Net::IMAP::MailboxList attr=[:Noinferiors, :Marked], delim="/", name="foo/bar">, \\
    #        #<Net::IMAP::MailboxList attr=[:Noinferiors], delim="/", name="foo/baz">]
    def list(refname, mailbox)
      synchronize do
        send_command("LIST", refname, mailbox)
        return @responses.delete("LIST")
      end
    end

# Sends a XLIST command, and returns a subset of names from
    # the complete set of all names available to the client.
    # +refname+ provides a context (for instance, a base directory
    # in a directory-based mailbox hierarchy).  +mailbox+ specifies
    # a mailbox or (via wildcards) mailboxes under that context.
    # Two wildcards may be used in +mailbox+: '*', which matches
    # all characters *including* the hierarchy delimiter (for instance,
    # '/' on a UNIX-hosted directory-based mailbox hierarchy); and '%',
    # which matches all characters *except* the hierarchy delimiter.
    #
    # If +refname+ is empty, +mailbox+ is used directly to determine
    # which mailboxes to match.  If +mailbox+ is empty, the root
    # name of +refname+ and the hierarchy delimiter are returned.
    #
    # The XLIST command is like the LIST command except that the flags
    # returned refer to the function of the folder/mailbox, e.g. :Sent
    #
    # The return value is an array of +Net::IMAP::MailboxList+. For example:
    #
    #   imap.create("foo/bar")
    #   imap.create("foo/baz")
    #   p imap.xlist("", "foo/%")
    #   #=> [#<Net::IMAP::MailboxList attr=[:Noselect], delim="/", name="foo/">, \\
    #        #<Net::IMAP::MailboxList attr=[:Noinferiors, :Marked], delim="/", name="foo/bar">, \\
    #        #<Net::IMAP::MailboxList attr=[:Noinferiors], delim="/", name="foo/baz">]
    def xlist(refname, mailbox)
      synchronize do
        send_command("XLIST", refname, mailbox)
        return @responses.delete("XLIST")
      end
    end

# Sends the GETQUOTAROOT command along with the specified +mailbox+.
    # This command is generally available to both admin and user.
    # If this mailbox exists, it returns an array containing objects of type
    # Net::IMAP::MailboxQuotaRoot and Net::IMAP::MailboxQuota.
    def getquotaroot(mailbox)
      synchronize do
        send_command("GETQUOTAROOT", mailbox)
        result = []
        result.concat(@responses.delete("QUOTAROOT"))
        result.concat(@responses.delete("QUOTA"))
        return result
      end
    end

# Sends the GETQUOTA command along with specified +mailbox+.
    # If this mailbox exists, then an array containing a
    # Net::IMAP::MailboxQuota object is returned.  This
    # command is generally only available to server admin.
    def getquota(mailbox)
      synchronize do
        send_command("GETQUOTA", mailbox)
        return @responses.delete("QUOTA")
      end
    end

# Sends a SETQUOTA command along with the specified +mailbox+ and
    # +quota+.  If +quota+ is nil, then +quota+ will be unset for that
    # mailbox.  Typically one needs to be logged in as a server admin
    # for this to work.  The IMAP quota commands are described in
    # [RFC-2087].
    def setquota(mailbox, quota)
      if quota.nil?
        data = '()'
      else
        data = '(STORAGE ' + quota.to_s + ')'
      end
      send_command("SETQUOTA", mailbox, RawData.new(data))
    end

# Sends the SETACL command along with +mailbox+, +user+ and the
    # +rights+ that user is to have on that mailbox.  If +rights+ is nil,
    # then that user will be stripped of any rights to that mailbox.
    # The IMAP ACL commands are described in [RFC-2086].
    def setacl(mailbox, user, rights)
      if rights.nil?
        send_command("SETACL", mailbox, user, "")
      else
        send_command("SETACL", mailbox, user, rights)
      end
    end

# Send the GETACL command along with a specified +mailbox+.
    # If this mailbox exists, an array containing objects of
    # Net::IMAP::MailboxACLItem will be returned.
    def getacl(mailbox)
      synchronize do
        send_command("GETACL", mailbox)
        return @responses.delete("ACL")[-1]
      end
    end

# Sends a LSUB command, and returns a subset of names from the set
    # of names that the user has declared as being "active" or
    # "subscribed."  +refname+ and +mailbox+ are interpreted as
    # for #list().
    # The return value is an array of +Net::IMAP::MailboxList+.
    def lsub(refname, mailbox)
      synchronize do
        send_command("LSUB", refname, mailbox)
        return @responses.delete("LSUB")
      end
    end

# Sends a STATUS command, and returns the status of the indicated
    # +mailbox+. +attr+ is a list of one or more attributes whose
    # statuses are to be requested.  Supported attributes include:
    #
    #   MESSAGES:: the number of messages in the mailbox.
    #   RECENT:: the number of recent messages in the mailbox.
    #   UNSEEN:: the number of unseen messages in the mailbox.
    #
    # The return value is a hash of attributes. For example:
    #
    #   p imap.status("inbox", ["MESSAGES", "RECENT"])
    #   #=> {"RECENT"=>0, "MESSAGES"=>44}
    #
    # A Net::IMAP::NoResponseError is raised if status values
    # for +mailbox+ cannot be returned; for instance, because it
    # does not exist.
    def status(mailbox, attr)
      synchronize do
        send_command("STATUS", mailbox, attr)
        return @responses.delete("STATUS")[-1].attr
      end
    end

# Sends a APPEND command to append the +message+ to the end of
    # the +mailbox+. The optional +flags+ argument is an array of
    # flags initially passed to the new message.  The optional
    # +date_time+ argument specifies the creation time to assign to the
    # new message; it defaults to the current time.
    # For example:
    #
    #   imap.append("inbox", <<EOF.gsub(/\n/, "\r\n"), [:Seen], Time.now)
    #   Subject: hello
    #   From: shugo@ruby-lang.org
    #   To: shugo@ruby-lang.org
    #
    #   hello world
    #   EOF
    #
    # A Net::IMAP::NoResponseError is raised if the mailbox does
    # not exist (it is not created automatically), or if the flags,
    # date_time, or message arguments contain errors.
    def append(mailbox, message, flags = nil, date_time = nil)
      args = []
      if flags
        args.push(flags)
      end
      args.push(date_time) if date_time
      args.push(Literal.new(message))
      send_command("APPEND", mailbox, *args)
    end

# Sends a CHECK command to request a checkpoint of the currently
    # selected mailbox.  This performs implementation-specific
    # housekeeping; for instance, reconciling the mailbox's
    # in-memory and on-disk state.
    def check
      send_command("CHECK")
    end

# Sends a CLOSE command to close the currently selected mailbox.
    # The CLOSE command permanently removes from the mailbox all
    # messages that have the \Deleted flag set.
    def close
      send_command("CLOSE")
    end

# Sends a EXPUNGE command to permanently remove from the currently
    # selected mailbox all messages that have the \Deleted flag set.
    def expunge
      synchronize do
        send_command("EXPUNGE")
        return @responses.delete("EXPUNGE")
      end
    end

# Sends a SEARCH command to search the mailbox for messages that
    # match the given searching criteria, and returns message sequence
    # numbers.  +keys+ can either be a string holding the entire
    # search string, or a single-dimension array of search keywords and
    # arguments.  The following are some common search criteria;
    # see [IMAP] section 6.4.4 for a full list.
    #
    # <message set>:: a set of message sequence numbers.  ',' indicates
    #                 an interval, ':' indicates a range.  For instance,
    #                 '2,10:12,15' means "2,10,11,12,15".
    #
    # BEFORE <date>:: messages with an internal date strictly before
    #                 <date>.  The date argument has a format similar
    #                 to 8-Aug-2002.
    #
    # BODY <string>:: messages that contain <string> within their body.
    #
    # CC <string>:: messages containing <string> in their CC field.
    #
    # FROM <string>:: messages that contain <string> in their FROM field.
    #
    # NEW:: messages with the \Recent, but not the \Seen, flag set.
    #
    # NOT <search-key>:: negate the following search key.
    #
    # OR <search-key> <search-key>:: "or" two search keys together.
    #
    # ON <date>:: messages with an internal date exactly equal to <date>,
    #             which has a format similar to 8-Aug-2002.
    #
    # SINCE <date>:: messages with an internal date on or after <date>.
    #
    # SUBJECT <string>:: messages with <string> in their subject.
    #
    # TO <string>:: messages with <string> in their TO field.
    #
    # For example:
    #
    #   p imap.search(["SUBJECT", "hello", "NOT", "NEW"])
    #   #=> [1, 6, 7, 8]
    def search(keys, charset = nil)
      return search_internal("SEARCH", keys, charset)
    end

# Similar to #search(), but returns unique identifiers.
    def uid_search(keys, charset = nil)
      return search_internal("UID SEARCH", keys, charset)
    end

# Sends a FETCH command to retrieve data associated with a message
    # in the mailbox.
    #
    # The +set+ parameter is a number or a range between two numbers,
    # or an array of those.  The number is a message sequence number,
    # where -1 represents a '*' for use in range notation like 100..-1
    # being interpreted as '100:*'.  Beware that the +exclude_end?+
    # property of a Range object is ignored, and the contents of a
    # range are independent of the order of the range endpoints as per
    # the protocol specification, so 1...5, 5..1 and 5...1 are all
    # equivalent to 1..5.
    #
    # +attr+ is a list of attributes to fetch; see the documentation
    # for Net::IMAP::FetchData for a list of valid attributes.
    #
    # The return value is an array of Net::IMAP::FetchData or nil
    # (instead of an empty array) if there is no matching message.
    #
    # For example:
    #
    #   p imap.fetch(6..8, "UID")
    #   #=> [#<Net::IMAP::FetchData seqno=6, attr={"UID"=>98}>, \\
    #        #<Net::IMAP::FetchData seqno=7, attr={"UID"=>99}>, \\
    #        #<Net::IMAP::FetchData seqno=8, attr={"UID"=>100}>]
    #   p imap.fetch(6, "BODY[HEADER.FIELDS (SUBJECT)]")
    #   #=> [#<Net::IMAP::FetchData seqno=6, attr={"BODY[HEADER.FIELDS (SUBJECT)]"=>"Subject: test\r\n\r\n"}>]
    #   data = imap.uid_fetch(98, ["RFC822.SIZE", "INTERNALDATE"])[0]
    #   p data.seqno
    #   #=> 6
    #   p data.attr["RFC822.SIZE"]
    #   #=> 611
    #   p data.attr["INTERNALDATE"]
    #   #=> "12-Oct-2000 22:40:59 +0900"
    #   p data.attr["UID"]
    #   #=> 98
    def fetch(set, attr, mod = nil)
      return fetch_internal("FETCH", set, attr, mod)
    end

# Similar to #fetch(), but +set+ contains unique identifiers.
    def uid_fetch(set, attr, mod = nil)
      return fetch_internal("UID FETCH", set, attr, mod)
    end

# Sends a STORE command to alter data associated with messages
    # in the mailbox, in particular their flags. The +set+ parameter
    # is a number, an array of numbers, or a Range object. Each number
    # is a message sequence number.  +attr+ is the name of a data item
    # to store: 'FLAGS' will replace the message's flag list
    # with the provided one, '+FLAGS' will add the provided flags,
    # and '-FLAGS' will remove them.  +flags+ is a list of flags.
    #
    # The return value is an array of Net::IMAP::FetchData. For example:
    #
    #   p imap.store(6..8, "+FLAGS", [:Deleted])
    #   #=> [#<Net::IMAP::FetchData seqno=6, attr={"FLAGS"=>[:Seen, :Deleted]}>, \\
    #        #<Net::IMAP::FetchData seqno=7, attr={"FLAGS"=>[:Seen, :Deleted]}>, \\
    #        #<Net::IMAP::FetchData seqno=8, attr={"FLAGS"=>[:Seen, :Deleted]}>]
    def store(set, attr, flags)
      return store_internal("STORE", set, attr, flags)
    end

# Similar to #store(), but +set+ contains unique identifiers.
    def uid_store(set, attr, flags)
      return store_internal("UID STORE", set, attr, flags)
    end

# Sends a COPY command to copy the specified message(s) to the end
    # of the specified destination +mailbox+. The +set+ parameter is
    # a number, an array of numbers, or a Range object. The number is
    # a message sequence number.
    def copy(set, mailbox)
      copy_internal("COPY", set, mailbox)
    end

# Similar to #copy(), but +set+ contains unique identifiers.
    def uid_copy(set, mailbox)
      copy_internal("UID COPY", set, mailbox)
    end

# Sends a MOVE command to move the specified message(s) to the end
    # of the specified destination +mailbox+. The +set+ parameter is
    # a number, an array of numbers, or a Range object. The number is
    # a message sequence number.
    # The IMAP MOVE extension is described in [RFC-6851].
    def move(set, mailbox)
      copy_internal("MOVE", set, mailbox)
    end

# Similar to #move(), but +set+ contains unique identifiers.
    def uid_move(set, mailbox)
      copy_internal("UID MOVE", set, mailbox)
    end

# Sends a SORT command to sort messages in the mailbox.
    # Returns an array of message sequence numbers. For example:
    #
    #   p imap.sort(["FROM"], ["ALL"], "US-ASCII")
    #   #=> [1, 2, 3, 5, 6, 7, 8, 4, 9]
    #   p imap.sort(["DATE"], ["SUBJECT", "hello"], "US-ASCII")
    #   #=> [6, 7, 8, 1]
    #
    # See [SORT-THREAD-EXT] for more details.
    def sort(sort_keys, search_keys, charset)
      return sort_internal("SORT", sort_keys, search_keys, charset)
    end

# Similar to #sort(), but returns an array of unique identifiers.
    def uid_sort(sort_keys, search_keys, charset)
      return sort_internal("UID SORT", sort_keys, search_keys, charset)
    end

# Adds a response handler. For example, to detect when
    # the server sends a new EXISTS response (which normally
    # indicates new messages being added to the mailbox),
    # add the following handler after selecting the
    # mailbox:
    #
    #   imap.add_response_handler { |resp|
    #     if resp.kind_of?(Net::IMAP::UntaggedResponse) and resp.name == "EXISTS"
    #       puts "Mailbox now has #{resp.data} messages"
    #     end
    #   }
    #
    def add_response_handler(handler = nil, &block)
      raise ArgumentError, "two Procs are passed" if handler && block
      @response_handlers.push(block || handler)
    end

# Removes the response handler.
    def remove_response_handler(handler)
      @response_handlers.delete(handler)
    end

# Similar to #search(), but returns message sequence numbers in threaded
    # format, as a Net::IMAP::ThreadMember tree.  The supported algorithms
    # are:
    #
    # ORDEREDSUBJECT:: split into single-level threads according to subject,
    #                  ordered by date.
    # REFERENCES:: split into threads by parent/child relationships determined
    #              by which message is a reply to which.
    #
    # Unlike #search(), +charset+ is a required argument.  US-ASCII
    # and UTF-8 are sample values.
    #
    # See [SORT-THREAD-EXT] for more details.
    def thread(algorithm, search_keys, charset)
      return thread_internal("THREAD", algorithm, search_keys, charset)
    end

# Similar to #thread(), but returns unique identifiers instead of
    # message sequence numbers.
    def uid_thread(algorithm, search_keys, charset)
      return thread_internal("UID THREAD", algorithm, search_keys, charset)
    end

# Sends an IDLE command that waits for notifications of new or expunged
    # messages.  Yields responses from the server during the IDLE.
    #
    # Use #idle_done() to leave IDLE.
    #
    # If +timeout+ is given, this method returns after +timeout+ seconds passed.
    # +timeout+ can be used for keep-alive.  For example, the following code
    # checks the connection for each 60 seconds.
    #
    #   loop do
    #     imap.idle(60) do |res|
    #       ...
    #     end
    #   end
    def idle(timeout = nil, &response_handler)
      raise LocalJumpError, "no block given" unless response_handler

response = nil

synchronize do
        tag = Thread.current[:net_imap_tag] = generate_tag
        put_string("#{tag} IDLE#{CRLF}")

begin
          add_response_handler(&response_handler)
          @idle_done_cond = new_cond
          @idle_done_cond.wait(timeout)
          @idle_done_cond = nil
          if @receiver_thread_terminating
            raise @exception || Net::IMAP::Error.new("connection closed")
          end
        ensure
          unless @receiver_thread_terminating
            remove_response_handler(response_handler)
            put_string("DONE#{CRLF}")
            response = get_tagged_response(tag, "IDLE")
          end
        end
      end

return response
    end

# Leaves IDLE.
    def idle_done
      synchronize do
        if @idle_done_cond.nil?
          raise Net::IMAP::Error, "not during IDLE"
        end
        @idle_done_cond.signal
      end
    end

# Decode a string from modified UTF-7 format to UTF-8.
    #
    # UTF-7 is a 7-bit encoding of Unicode [UTF7].  IMAP uses a
    # slightly modified version of this to encode mailbox names
    # containing non-ASCII characters; see [IMAP] section 5.1.3.
    #
    # Net::IMAP does _not_ automatically encode and decode
    # mailbox names to and from UTF-7.
    def self.decode_utf7(s)
      return s.gsub(/&([^-]+)?-/n) {
        if $1
          ($1.tr(",", "/") + "===").unpack1("m").encode(Encoding::UTF_8, Encoding::UTF_16BE)
        else
          "&"
        end
      }
    end

# Encode a string from UTF-8 format to modified UTF-7.
    def self.encode_utf7(s)
      return s.gsub(/(&)|[^\x20-\x7e]+/) {
        if $1
          "&-"
        else
          base64 = [$&.encode(Encoding::UTF_16BE)].pack("m0")
          "&" + base64.delete("=").tr("/", ",") + "-"
        end
      }.force_encoding("ASCII-8BIT")
    end

# Formats +time+ as an IMAP-style date.
    def self.format_date(time)
      return time.strftime('%d-%b-%Y')
    end

# Formats +time+ as an IMAP-style date-time.
    def self.format_datetime(time)
      return time.strftime('%d-%b-%Y %H:%M %z')
    end

private

CRLF = "\r\n"      # :nodoc:
    PORT = 143         # :nodoc:
    SSL_PORT = 993   # :nodoc:

@@debug = false
    @@authenticators = {}
    @@max_flag_count = 10000

# :call-seq:
    #    Net::IMAP.new(host, options = {})
    #
    # Creates a new Net::IMAP object and connects it to the specified
    # +host+.
    #
    # +options+ is an option hash, each key of which is a symbol.
    #
    # The available options are:
    #
    # port::  Port number (default value is 143 for imap, or 993 for imaps)
    # ssl::   If options[:ssl] is true, then an attempt will be made
    #         to use SSL (now TLS) to connect to the server.  For this to work
    #         OpenSSL [OSSL] and the Ruby OpenSSL [RSSL] extensions need to
    #         be installed.
    #         If options[:ssl] is a hash, it's passed to
    #         OpenSSL::SSL::SSLContext#set_params as parameters.
    # open_timeout:: Seconds to wait until a connection is opened
    #
    # The most common errors are:
    #
    # Errno::ECONNREFUSED:: Connection refused by +host+ or an intervening
    #                       firewall.
    # Errno::ETIMEDOUT:: Connection timed out (possibly due to packets
    #                    being dropped by an intervening firewall).
    # Errno::ENETUNREACH:: There is no route to that network.
    # SocketError:: Hostname not known or other socket error.
    # Net::IMAP::ByeResponseError:: The connected to the host was successful, but
    #                               it immediately said goodbye.
    def initialize(host, port_or_options = {},
                   usessl = false, certs = nil, verify = true)
      super()
      @host = host
      begin
        options = port_or_options.to_hash
      rescue NoMethodError
        # for backward compatibility
        options = {}
        options[:port] = port_or_options
        if usessl
          options[:ssl] = create_ssl_params(certs, verify)
        end
      end
      @port = options[:port] || (options[:ssl] ? SSL_PORT : PORT)
      @tag_prefix = "RUBY"
      @tagno = 0
      @open_timeout = options[:open_timeout] || 30
      @parser = ResponseParser.new
      @sock = tcp_socket(@host, @port)
      begin
        if options[:ssl]
          start_tls_session(options[:ssl])
          @usessl = true
        else
          @usessl = false
        end
        @responses = Hash.new([].freeze)
        @tagged_responses = {}
        @response_handlers = []
        @tagged_response_arrival = new_cond
        @continued_command_tag = nil
        @continuation_request_arrival = new_cond
        @continuation_request_exception = nil
        @idle_done_cond = nil
        @logout_command_tag = nil
        @debug_output_bol = true
        @exception = nil

@greeting = get_response
        if @greeting.nil?
          raise Error, "connection closed"
        end
        if @greeting.name == "BYE"
          raise ByeResponseError, @greeting
        end

@client_thread = Thread.current
        @receiver_thread = Thread.start {
          begin
            receive_responses
          rescue Exception
          end
        }
        @receiver_thread_terminating = false
      rescue Exception
        @sock.close
        raise
      end
    end

def tcp_socket(host, port)
      s = Socket.tcp(host, port, :connect_timeout => @open_timeout)
      s.setsockopt(:SOL_SOCKET, :SO_KEEPALIVE, true)
      s
    rescue Errno::ETIMEDOUT
      raise Net::OpenTimeout, "Timeout to open TCP connection to " +
        "#{host}:#{port} (exceeds #{@open_timeout} seconds)"
    end

def receive_responses
      connection_closed = false
      until connection_closed
        synchronize do
          @exception = nil
        end
        begin
          resp = get_response
        rescue Exception => e
          synchronize do
            @sock.close
            @exception = e
          end
          break
        end
        unless resp
          synchronize do
            @exception = EOFError.new("end of file reached")
          end
          break
        end
        begin
          synchronize do
            case resp
            when TaggedResponse
              @tagged_responses[resp.tag] = resp
              @tagged_response_arrival.broadcast
              case resp.tag
              when @logout_command_tag
                return
              when @continued_command_tag
                @continuation_request_exception =
                  RESPONSE_ERRORS[resp.name].new(resp)
                @continuation_request_arrival.signal
              end
            when UntaggedResponse
              record_response(resp.name, resp.data)
              if resp.data.instance_of?(ResponseText) &&
                  (code = resp.data.code)
                record_response(code.name, code.data)
              end
              if resp.name == "BYE" && @logout_command_tag.nil?
                @sock.close
                @exception = ByeResponseError.new(resp)
                connection_closed = true
              end
            when ContinuationRequest
              @continuation_request_arrival.signal
            end
            @response_handlers.each do |handler|
              handler.call(resp)
            end
          end
        rescue Exception => e
          @exception = e
          synchronize do
            @tagged_response_arrival.broadcast
            @continuation_request_arrival.broadcast
          end
        end
      end
      synchronize do
        @receiver_thread_terminating = true
        @tagged_response_arrival.broadcast
        @continuation_request_arrival.broadcast
        if @idle_done_cond
          @idle_done_cond.signal
        end
      end
    end

def get_tagged_response(tag, cmd)
      until @tagged_responses.key?(tag)
        raise @exception if @exception
        @tagged_response_arrival.wait
      end
      resp = @tagged_responses.delete(tag)
      case resp.name
      when /\A(?:OK)\z/ni
        return resp
      when /\A(?:NO)\z/ni
        raise NoResponseError, resp
      when /\A(?:BAD)\z/ni
        raise BadResponseError, resp
      else
        raise UnknownResponseError, resp
      end
    end

def get_response
      buff = String.new
      while true
        s = @sock.gets(CRLF)
        break unless s
        buff.concat(s)
        if /\{(\d+)\}\r\n/n =~ s
          s = @sock.read($1.to_i)
          buff.concat(s)
        else
          break
        end
      end
      return nil if buff.length == 0
      if @@debug
        $stderr.print(buff.gsub(/^/n, "S: "))
      end
      return @parser.parse(buff)
    end

def record_response(name, data)
      unless @responses.has_key?(name)
        @responses[name] = []
      end
      @responses[name].push(data)
    end

def send_command(cmd, *args, &block)
      synchronize do
        args.each do |i|
          validate_data(i)
        end
        tag = generate_tag
        put_string(tag + " " + cmd)
        args.each do |i|
          put_string(" ")
          send_data(i, tag)
        end
        put_string(CRLF)
        if cmd == "LOGOUT"
          @logout_command_tag = tag
        end
        if block
          add_response_handler(&block)
        end
        begin
          return get_tagged_response(tag, cmd)
        ensure
          if block
            remove_response_handler(block)
          end
        end
      end
    end

def generate_tag
      @tagno += 1
      return format("%s%04d", @tag_prefix, @tagno)
    end

def put_string(str)
      @sock.print(str)
      if @@debug
        if @debug_output_bol
          $stderr.print("C: ")
        end
        $stderr.print(str.gsub(/\n(?!\z)/n, "\nC: "))
        if /\r\n\z/n.match(str)
          @debug_output_bol = true
        else
          @debug_output_bol = false
        end
      end
    end

def validate_data(data)
      case data
      when nil
      when String
      when Integer
        NumValidator.ensure_number(data)
      when Array
        if data[0] == 'CHANGEDSINCE'
          NumValidator.ensure_mod_sequence_value(data[1])
        else
          data.each do |i|
            validate_data(i)
          end
        end
      when Time
      when Symbol
      else
        data.validate
      end
    end

def send_data(data, tag = nil)
      case data
      when nil
        put_string("NIL")
      when String
        send_string_data(data, tag)
      when Integer
        send_number_data(data)
      when Array
        send_list_data(data, tag)
      when Time
        send_time_data(data)
      when Symbol
        send_symbol_data(data)
      else
        data.send_data(self, tag)
      end
    end

def send_string_data(str, tag = nil)
      case str
      when ""
        put_string('""')
      when /[\x80-\xff\r\n]/n
        # literal
        send_literal(str, tag)
      when /[(){ \x00-\x1f\x7f%*"\\]/n
        # quoted string
        send_quoted_string(str)
      else
        put_string(str)
      end
    end

def send_quoted_string(str)
      put_string('"' + str.gsub(/["\\]/n, "\\\\\\&") + '"')
    end

def send_literal(str, tag = nil)
      synchronize do
        put_string("{" + str.bytesize.to_s + "}" + CRLF)
        @continued_command_tag = tag
        @continuation_request_exception = nil
        begin
          @continuation_request_arrival.wait
          e = @continuation_request_exception || @exception
          raise e if e
          put_string(str)
        ensure
          @continued_command_tag = nil
          @continuation_request_exception = nil
        end
      end
    end

def send_number_data(num)
      put_string(num.to_s)
    end

def send_list_data(list, tag = nil)
      put_string("(")
      first = true
      list.each do |i|
        if first
          first = false
        else
          put_string(" ")
        end
        send_data(i, tag)
      end
      put_string(")")
    end

DATE_MONTH = %w(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec)

def send_time_data(time)
      t = time.dup.gmtime
      s = format('"%2d-%3s-%4d %02d:%02d:%02d +0000"',
                 t.day, DATE_MONTH[t.month - 1], t.year,
                 t.hour, t.min, t.sec)
      put_string(s)
    end

def send_symbol_data(symbol)
      put_string("\\" + symbol.to_s)
    end

def search_internal(cmd, keys, charset)
      if keys.instance_of?(String)
        keys = [RawData.new(keys)]
      else
        normalize_searching_criteria(keys)
      end
      synchronize do
        if charset
          send_command(cmd, "CHARSET", charset, *keys)
        else
          send_command(cmd, *keys)
        end
        return @responses.delete("SEARCH")[-1]
      end
    end

def fetch_internal(cmd, set, attr, mod = nil)
      case attr
      when String then
        attr = RawData.new(attr)
      when Array then
        attr = attr.map { |arg|
          arg.is_a?(String) ? RawData.new(arg) : arg
        }
      end

synchronize do
        @responses.delete("FETCH")
        if mod
          send_command(cmd, MessageSet.new(set), attr, mod)
        else
          send_command(cmd, MessageSet.new(set), attr)
        end
        return @responses.delete("FETCH")
      end
    end

def store_internal(cmd, set, attr, flags)
      if attr.instance_of?(String)
        attr = RawData.new(attr)
      end
      synchronize do
        @responses.delete("FETCH")
        send_command(cmd, MessageSet.new(set), attr, flags)
        return @responses.delete("FETCH")
      end
    end

def copy_internal(cmd, set, mailbox)
      send_command(cmd, MessageSet.new(set), mailbox)
    end

def sort_internal(cmd, sort_keys, search_keys, charset)
      if search_keys.instance_of?(String)
        search_keys = [RawData.new(search_keys)]
      else
        normalize_searching_criteria(search_keys)
      end
      normalize_searching_criteria(search_keys)
      synchronize do
        send_command(cmd, sort_keys, charset, *search_keys)
        return @responses.delete("SORT")[-1]
      end
    end

def thread_internal(cmd, algorithm, search_keys, charset)
      if search_keys.instance_of?(String)
        search_keys = [RawData.new(search_keys)]
      else
        normalize_searching_criteria(search_keys)
      end
      normalize_searching_criteria(search_keys)
      send_command(cmd, algorithm, charset, *search_keys)
      return @responses.delete("THREAD")[-1]
    end

def normalize_searching_criteria(keys)
      keys.collect! do |i|
        case i
        when -1, Range, Array
          MessageSet.new(i)
        else
          i
        end
      end
    end

def create_ssl_params(certs = nil, verify = true)
      params = {}
      if certs
        if File.file?(certs)
          params[:ca_file] = certs
        elsif File.directory?(certs)
          params[:ca_path] = certs
        end
      end
      if verify
        params[:verify_mode] = VERIFY_PEER
      else
        params[:verify_mode] = VERIFY_NONE
      end
      return params
    end

def start_tls_session(params = {})
      unless defined?(OpenSSL::SSL)
        raise "SSL extension not installed"
      end
      if @sock.kind_of?(OpenSSL::SSL::SSLSocket)
        raise RuntimeError, "already using SSL"
      end
      begin
        params = params.to_hash
      rescue NoMethodError
        params = {}
      end
      context = SSLContext.new
      context.set_params(params)
      if defined?(VerifyCallbackProc)
        context.verify_callback = VerifyCallbackProc
      end
      @sock = SSLSocket.new(@sock, context)
      @sock.sync_close = true
      @sock.hostname = @host if @sock.respond_to? :hostname=
      ssl_socket_connect(@sock, @open_timeout)
      if context.verify_mode != VERIFY_NONE
        @sock.post_connection_check(@host)
      end
    end

class RawData # :nodoc:
      def send_data(imap, tag)
        imap.__send__(:put_string, @data)
      end

def validate
      end

private

def initialize(data)
        @data = data
      end
    end

class Atom # :nodoc:
      def send_data(imap, tag)
        imap.__send__(:put_string, @data)
      end

def validate
      end

private

def initialize(data)
        @data = data
      end
    end

class QuotedString # :nodoc:
      def send_data(imap, tag)
        imap.__send__(:send_quoted_string, @data)
      end

def validate
      end

private

def initialize(data)
        @data = data
      end
    end

class Literal # :nodoc:
      def send_data(imap, tag)
        imap.__send__(:send_literal, @data, tag)
      end

def validate
      end

private

def initialize(data)
        @data = data
      end
    end

class MessageSet # :nodoc:
      def send_data(imap, tag)
        imap.__send__(:put_string, format_internal(@data))
      end

def validate
        validate_internal(@data)
      end

private

def initialize(data)
        @data = data
      end

def format_internal(data)
        case data
        when "*"
          return data
        when Integer
          if data == -1
            return "*"
          else
            return data.to_s
          end
        when Range
          return format_internal(data.first) +
            ":" + format_internal(data.last)
        when Array
          return data.collect {|i| format_internal(i)}.join(",")
        when ThreadMember
          return data.seqno.to_s +
            ":" + data.children.collect {|i| format_internal(i).join(",")}
        end
      end

def validate_internal(data)
        case data
        when "*"
        when Integer
          NumValidator.ensure_nz_number(data)
        when Range
        when Array
          data.each do |i|
            validate_internal(i)
          end
        when ThreadMember
          data.children.each do |i|
            validate_internal(i)
          end
        else
          raise DataFormatError, data.inspect
        end
      end
    end

# Common validators of number and nz_number types
    module NumValidator # :nodoc
      class << self
        # Check is passed argument valid 'number' in RFC 3501 terminology
        def valid_number?(num)
          # [RFC 3501]
          # number          = 1*DIGIT
          #                    ; Unsigned 32-bit integer
          #                    ; (0 <= n < 4,294,967,296)
          num >= 0 && num < 4294967296
        end

# Check is passed argument valid 'nz_number' in RFC 3501 terminology
        def valid_nz_number?(num)
          # [RFC 3501]
          # nz-number       = digit-nz *DIGIT
          #                    ; Non-zero unsigned 32-bit integer
          #                    ; (0 < n < 4,294,967,296)
          num != 0 && valid_number?(num)
        end

# Check is passed argument valid 'mod_sequence_value' in RFC 4551 terminology
        def valid_mod_sequence_value?(num)
          # mod-sequence-value  = 1*DIGIT
          #                        ; Positive unsigned 64-bit integer
          #                        ; (mod-sequence)
          #                        ; (1 <= n < 18,446,744,073,709,551,615)
          num >= 1 && num < 18446744073709551615
        end

# Ensure argument is 'number' or raise DataFormatError
        def ensure_number(num)
          return if valid_number?(num)

msg = "number must be unsigned 32-bit integer: #{num}"
          raise DataFormatError, msg
        end

# Ensure argument is 'nz_number' or raise DataFormatError
        def ensure_nz_number(num)
          return if valid_nz_number?(num)

msg = "nz_number must be non-zero unsigned 32-bit integer: #{num}"
          raise DataFormatError, msg
        end

# Ensure argument is 'mod_sequence_value' or raise DataFormatError
        def ensure_mod_sequence_value(num)
          return if valid_mod_sequence_value?(num)

msg = "mod_sequence_value must be unsigned 64-bit integer: #{num}"
          raise DataFormatError, msg
        end
      end
    end

# Net::IMAP::ContinuationRequest represents command continuation requests.
    #
    # The command continuation request response is indicated by a "+" token
    # instead of a tag.  This form of response indicates that the server is
    # ready to accept the continuation of a command from the client.  The
    # remainder of this response is a line of text.
    #
    #   continue_req    ::= "+" SPACE (resp_text / base64)
    #
    # ==== Fields:
    #
    # data:: Returns the data (Net::IMAP::ResponseText).
    #
    # raw_data:: Returns the raw data string.
    ContinuationRequest = Struct.new(:data, :raw_data)

# Net::IMAP::UntaggedResponse represents untagged responses.
    #
    # Data transmitted by the server to the client and status responses
    # that do not indicate command completion are prefixed with the token
    # "*", and are called untagged responses.
    #
    #   response_data   ::= "*" SPACE (resp_cond_state / resp_cond_bye /
    #                       mailbox_data / message_data / capability_data)
    #
    # ==== Fields:
    #
    # name:: Returns the name, such as "FLAGS", "LIST", or "FETCH".
    #
    # data:: Returns the data such as an array of flag symbols,
    #        a ((<Net::IMAP::MailboxList>)) object.
    #
    # raw_data:: Returns the raw data string.
    UntaggedResponse = Struct.new(:name, :data, :raw_data)

# Net::IMAP::TaggedResponse represents tagged responses.
    #
    # The server completion result response indicates the success or
    # failure of the operation.  It is tagged with the same tag as the
    # client command which began the operation.
    #
    #   response_tagged ::= tag SPACE resp_cond_state CRLF
    #
    #   tag             ::= 1*<any ATOM_CHAR except "+">
    #
    #   resp_cond_state ::= ("OK" / "NO" / "BAD") SPACE resp_text
    #
    # ==== Fields:
    #
    # tag:: Returns the tag.
    #
    # name:: Returns the name, one of "OK", "NO", or "BAD".
    #
    # data:: Returns the data. See ((<Net::IMAP::ResponseText>)).
    #
    # raw_data:: Returns the raw data string.
    #
    TaggedResponse = Struct.new(:tag, :name, :data, :raw_data)

# Net::IMAP::ResponseText represents texts of responses.
    # The text may be prefixed by the response code.
    #
    #   resp_text       ::= ["[" resp_text_code "]" SPACE] (text_mime2 / text)
    #                       ;; text SHOULD NOT begin with "[" or "="
    #
    # ==== Fields:
    #
    # code:: Returns the response code. See ((<Net::IMAP::ResponseCode>)).
    #
    # text:: Returns the text.
    #
    ResponseText = Struct.new(:code, :text)

# Net::IMAP::ResponseCode represents response codes.
    #
    #   resp_text_code  ::= "ALERT" / "PARSE" /
    #                       "PERMANENTFLAGS" SPACE "(" #(flag / "\*") ")" /
    #                       "READ-ONLY" / "READ-WRITE" / "TRYCREATE" /
    #                       "UIDVALIDITY" SPACE nz_number /
    #                       "UNSEEN" SPACE nz_number /
    #                       atom [SPACE 1*<any TEXT_CHAR except "]">]
    #
    # ==== Fields:
    #
    # name:: Returns the name, such as "ALERT", "PERMANENTFLAGS", or "UIDVALIDITY".
    #
    # data:: Returns the data, if it exists.
    #
    ResponseCode = Struct.new(:name, :data)

# Net::IMAP::MailboxList represents contents of the LIST response.
    #
    #   mailbox_list    ::= "(" #("\Marked" / "\Noinferiors" /
    #                       "\Noselect" / "\Unmarked" / flag_extension) ")"
    #                       SPACE (<"> QUOTED_CHAR <"> / nil) SPACE mailbox
    #
    # ==== Fields:
    #
    # attr:: Returns the name attributes. Each name attribute is a symbol
    #        capitalized by String#capitalize, such as :Noselect (not :NoSelect).
    #
    # delim:: Returns the hierarchy delimiter.
    #
    # name:: Returns the mailbox name.
    #
    MailboxList = Struct.new(:attr, :delim, :name)

# Net::IMAP::MailboxQuota represents contents of GETQUOTA response.
    # This object can also be a response to GETQUOTAROOT.  In the syntax
    # specification below, the delimiter used with the "#" construct is a
    # single space (SPACE).
    #
    #    quota_list      ::= "(" #quota_resource ")"
    #
    #    quota_resource  ::= atom SPACE number SPACE number
    #
    #    quota_response  ::= "QUOTA" SPACE astring SPACE quota_list
    #
    # ==== Fields:
    #
    # mailbox:: The mailbox with the associated quota.
    #
    # usage:: Current storage usage of the mailbox.
    #
    # quota:: Quota limit imposed on the mailbox.
    #
    MailboxQuota = Struct.new(:mailbox, :usage, :quota)

# Net::IMAP::MailboxQuotaRoot represents part of the GETQUOTAROOT
    # response. (GETQUOTAROOT can also return Net::IMAP::MailboxQuota.)
    #
    #    quotaroot_response ::= "QUOTAROOT" SPACE astring *(SPACE astring)
    #
    # ==== Fields:
    #
    # mailbox:: The mailbox with the associated quota.
    #
    # quotaroots:: Zero or more quotaroots that affect the quota on the
    #              specified mailbox.
    #
    MailboxQuotaRoot = Struct.new(:mailbox, :quotaroots)

# Net::IMAP::MailboxACLItem represents the response from GETACL.
    #
    #    acl_data        ::= "ACL" SPACE mailbox *(SPACE identifier SPACE rights)
    #
    #    identifier      ::= astring
    #
    #    rights          ::= astring
    #
    # ==== Fields:
    #
    # user:: Login name that has certain rights to the mailbox
    #        that was specified with the getacl command.
    #
    # rights:: The access rights the indicated user has to the
    #          mailbox.
    #
    MailboxACLItem = Struct.new(:user, :rights, :mailbox)

# Net::IMAP::StatusData represents the contents of the STATUS response.
    #
    # ==== Fields:
    #
    # mailbox:: Returns the mailbox name.
    #
    # attr:: Returns a hash. Each key is one of "MESSAGES", "RECENT", "UIDNEXT",
    #        "UIDVALIDITY", "UNSEEN". Each value is a number.
    #
    StatusData = Struct.new(:mailbox, :attr)

# Net::IMAP::FetchData represents the contents of the FETCH response.
    #
    # ==== Fields:
    #
    # seqno:: Returns the message sequence number.
    #         (Note: not the unique identifier, even for the UID command response.)
    #
    # attr:: Returns a hash. Each key is a data item name, and each value is
    #        its value.
    #
    #        The current data items are:
    #
    #        [BODY]
    #           A form of BODYSTRUCTURE without extension data.
    #        [BODY[<section>]<<origin_octet>>]
    #           A string expressing the body contents of the specified section.
    #        [BODYSTRUCTURE]
    #           An object that describes the [MIME-IMB] body structure of a message.
    #           See Net::IMAP::BodyTypeBasic, Net::IMAP::BodyTypeText,
    #           Net::IMAP::BodyTypeMessage, Net::IMAP::BodyTypeMultipart.
    #        [ENVELOPE]
    #           A Net::IMAP::Envelope object that describes the envelope
    #           structure of a message.
    #        [FLAGS]
    #           A array of flag symbols that are set for this message. Flag symbols
    #           are capitalized by String#capitalize.
    #        [INTERNALDATE]
    #           A string representing the internal date of the message.
    #        [RFC822]
    #           Equivalent to BODY[].
    #        [RFC822.HEADER]
    #           Equivalent to BODY.PEEK[HEADER].
    #        [RFC822.SIZE]
    #           A number expressing the [RFC-822] size of the message.
    #        [RFC822.TEXT]
    #           Equivalent to BODY[TEXT].
    #        [UID]
    #           A number expressing the unique identifier of the message.
    #
    FetchData = Struct.new(:seqno, :attr)

# Net::IMAP::Envelope represents envelope structures of messages.
    #
    # ==== Fields:
    #
    # date:: Returns a string that represents the date.
    #
    # subject:: Returns a string that represents the subject.
    #
    # from:: Returns an array of Net::IMAP::Address that represents the from.
    #
    # sender:: Returns an array of Net::IMAP::Address that represents the sender.
    #
    # reply_to:: Returns an array of Net::IMAP::Address that represents the reply-to.
    #
    # to:: Returns an array of Net::IMAP::Address that represents the to.
    #
    # cc:: Returns an array of Net::IMAP::Address that represents the cc.
    #
    # bcc:: Returns an array of Net::IMAP::Address that represents the bcc.
    #
    # in_reply_to:: Returns a string that represents the in-reply-to.
    #
    # message_id:: Returns a string that represents the message-id.
    #
    Envelope = Struct.new(:date, :subject, :from, :sender, :reply_to,
                          :to, :cc, :bcc, :in_reply_to, :message_id)

#
    # Net::IMAP::Address represents electronic mail addresses.
    #
    # ==== Fields:
    #
    # name:: Returns the phrase from [RFC-822] mailbox.
    #
    # route:: Returns the route from [RFC-822] route-addr.
    #
    # mailbox:: nil indicates end of [RFC-822] group.
    #           If non-nil and host is nil, returns [RFC-822] group name.
    #           Otherwise, returns [RFC-822] local-part.
    #
    # host:: nil indicates [RFC-822] group syntax.
    #        Otherwise, returns [RFC-822] domain name.
    #
    Address = Struct.new(:name, :route, :mailbox, :host)

#
    # Net::IMAP::ContentDisposition represents Content-Disposition fields.
    #
    # ==== Fields:
    #
    # dsp_type:: Returns the disposition type.
    #
    # param:: Returns a hash that represents parameters of the Content-Disposition
    #         field.
    #
    ContentDisposition = Struct.new(:dsp_type, :param)

# Net::IMAP::ThreadMember represents a thread-node returned
    # by Net::IMAP#thread.
    #
    # ==== Fields:
    #
    # seqno:: The sequence number of this message.
    #
    # children:: An array of Net::IMAP::ThreadMember objects for mail
    #            items that are children of this in the thread.
    #
    ThreadMember = Struct.new(:seqno, :children)

# Net::IMAP::BodyTypeBasic represents basic body structures of messages.
    #
    # ==== Fields:
    #
    # media_type:: Returns the content media type name as defined in [MIME-IMB].
    #
    # subtype:: Returns the content subtype name as defined in [MIME-IMB].
    #
    # param:: Returns a hash that represents parameters as defined in [MIME-IMB].
    #
    # content_id:: Returns a string giving the content id as defined in [MIME-IMB].
    #
    # description:: Returns a string giving the content description as defined in
    #               [MIME-IMB].
    #
    # encoding:: Returns a string giving the content transfer encoding as defined in
    #            [MIME-IMB].
    #
    # size:: Returns a number giving the size of the body in octets.
    #
    # md5:: Returns a string giving the body MD5 value as defined in [MD5].
    #
    # disposition:: Returns a Net::IMAP::ContentDisposition object giving
    #               the content disposition.
    #
    # language:: Returns a string or an array of strings giving the body
    #            language value as defined in [LANGUAGE-TAGS].
    #
    # extension:: Returns extension data.
    #
    # multipart?:: Returns false.
    #
    class BodyTypeBasic < Struct.new(:media_type, :subtype,
                                     :param, :content_id,
                                     :description, :encoding, :size,
                                     :md5, :disposition, :language,
                                     :extension)
      def multipart?
        return false
      end

# Obsolete: use +subtype+ instead.  Calling this will
      # generate a warning message to +stderr+, then return
      # the value of +subtype+.
      def media_subtype
        warn("media_subtype is obsolete, use subtype instead.\n", uplevel: 1)
        return subtype
      end
    end

# Net::IMAP::BodyTypeText represents TEXT body structures of messages.
    #
    # ==== Fields:
    #
    # lines:: Returns the size of the body in text lines.
    #
    # And Net::IMAP::BodyTypeText has all fields of Net::IMAP::BodyTypeBasic.
    #
    class BodyTypeText < Struct.new(:media_type, :subtype,
                                    :param, :content_id,
                                    :description, :encoding, :size,
                                    :lines,
                                    :md5, :disposition, :language,
                                    :extension)
      def multipart?
        return false
      end

# Net::IMAP::BodyTypeMessage represents MESSAGE/RFC822 body structures of messages.
    #
    # ==== Fields:
    #
    # envelope:: Returns a Net::IMAP::Envelope giving the envelope structure.
    #
    # body:: Returns an object giving the body structure.
    #
    # And Net::IMAP::BodyTypeMessage has all methods of Net::IMAP::BodyTypeText.
    #
    class BodyTypeMessage < Struct.new(:media_type, :subtype,
                                       :param, :content_id,
                                       :description, :encoding, :size,
                                       :envelope, :body, :lines,
                                       :md5, :disposition, :language,
                                       :extension)
      def multipart?
        return false
      end

# Net::IMAP::BodyTypeAttachment represents attachment body structures
    # of messages.
    #
    # ==== Fields:
    #
    # media_type:: Returns the content media type name.
    #
    # subtype:: Returns +nil+.
    #
    # param:: Returns a hash that represents parameters.
    #
    # multipart?:: Returns false.
    #
    class BodyTypeAttachment < Struct.new(:media_type, :subtype,
                                          :param)
      def multipart?
        return false
      end
    end

# Net::IMAP::BodyTypeMultipart represents multipart body structures
    # of messages.
    #
    # ==== Fields:
    #
    # media_type:: Returns the content media type name as defined in [MIME-IMB].
    #
    # subtype:: Returns the content subtype name as defined in [MIME-IMB].
    #
    # parts:: Returns multiple parts.
    #
    # param:: Returns a hash that represents parameters as defined in [MIME-IMB].
    #
    # disposition:: Returns a Net::IMAP::ContentDisposition object giving
    #               the content disposition.
    #
    # language:: Returns a string or an array of strings giving the body
    #            language value as defined in [LANGUAGE-TAGS].
    #
    # extension:: Returns extension data.
    #
    # multipart?:: Returns true.
    #
    class BodyTypeMultipart < Struct.new(:media_type, :subtype,
                                         :parts,
                                         :param, :disposition, :language,
                                         :extension)
      def multipart?
        return true
      end

class BodyTypeExtension < Struct.new(:media_type, :subtype,
                                         :params, :content_id,
                                         :description, :encoding, :size)
      def multipart?
        return false
      end
    end

class ResponseParser # :nodoc:
      def initialize
        @str = nil
        @pos = nil
        @lex_state = nil
        @token = nil
        @flag_symbols = {}
      end

def parse(str)
        @str = str
        @pos = 0
        @lex_state = EXPR_BEG
        @token = nil
        return response
      end

private

EXPR_BEG          = :EXPR_BEG
      EXPR_DATA         = :EXPR_DATA
      EXPR_TEXT         = :EXPR_TEXT
      EXPR_RTEXT        = :EXPR_RTEXT
      EXPR_CTEXT        = :EXPR_CTEXT

T_SPACE   = :SPACE
      T_NIL     = :NIL
      T_NUMBER  = :NUMBER
      T_ATOM    = :ATOM
      T_QUOTED  = :QUOTED
      T_LPAR    = :LPAR
      T_RPAR    = :RPAR
      T_BSLASH  = :BSLASH
      T_STAR    = :STAR
      T_LBRA    = :LBRA
      T_RBRA    = :RBRA
      T_LITERAL = :LITERAL
      T_PLUS    = :PLUS
      T_PERCENT = :PERCENT
      T_CRLF    = :CRLF
      T_EOF     = :EOF
      T_TEXT    = :TEXT

BEG_REGEXP = /\G(?:\
(?# 1:  SPACE   )( +)|\
(?# 2:  NIL     )(NIL)(?=[\x80-\xff(){ \x00-\x1f\x7f%*"\\\[\]+])|\
(?# 3:  NUMBER  )(\d+)(?=[\x80-\xff(){ \x00-\x1f\x7f%*"\\\[\]+])|\
(?# 4:  ATOM    )([^\x80-\xff(){ \x00-\x1f\x7f%*"\\\[\]+]+)|\
(?# 5:  QUOTED  )"((?:[^\x00\r\n"\\]|\\["\\])*)"|\
(?# 6:  LPAR    )($)|\
(?# 7:  RPAR    )($)|\
(?# 8:  BSLASH  )(\\)|\
(?# 9:  STAR    )(\*)|\
(?# 10: LBRA    )(\[)|\
(?# 11: RBRA    )(\])|\
(?# 12: LITERAL )\{(\d+)\}\r\n|\
(?# 13: PLUS    )(\+)|\
(?# 14: PERCENT )(%)|\
(?# 15: CRLF    )(\r\n)|\
(?# 16: EOF     )(\z))/ni

DATA_REGEXP = /\G(?:\
(?# 1:  SPACE   )( )|\
(?# 2:  NIL     )(NIL)|\
(?# 3:  NUMBER  )(\d+)|\
(?# 4:  QUOTED  )"((?:[^\x00\r\n"\\]|\\["\\])*)"|\
(?# 5:  LITERAL )\{(\d+)\}\r\n|\
(?# 6:  LPAR    )($)|\
(?# 7:  RPAR    )($))/ni

TEXT_REGEXP = /\G(?:\
(?# 1:  TEXT    )([^\x00\r\n]*))/ni

RTEXT_REGEXP = /\G(?:\
(?# 1:  LBRA    )(\[)|\
(?# 2:  TEXT    )([^\x00\r\n]*))/ni

CTEXT_REGEXP = /\G(?:\
(?# 1:  TEXT    )([^\x00\r\n\]]*))/ni

Token = Struct.new(:symbol, :value)

def response
        token = lookahead
        case token.symbol
        when T_PLUS
          result = continue_req
        when T_STAR
          result = response_untagged
        else
          result = response_tagged
        end
        while lookahead.symbol == T_SPACE
          # Ignore trailing space for Microsoft Exchange Server
          shift_token
        end
        match(T_CRLF)
        match(T_EOF)
        return result
      end

def continue_req
        match(T_PLUS)
        token = lookahead
        if token.symbol == T_SPACE
          shift_token
          return ContinuationRequest.new(resp_text, @str)
        else
          return ContinuationRequest.new(ResponseText.new(nil, ""), @str)
        end
      end

def response_untagged
        match(T_STAR)
        match(T_SPACE)
        token = lookahead
        if token.symbol == T_NUMBER
          return numeric_response
        elsif token.symbol == T_ATOM
          case token.value
          when /\A(?:OK|NO|BAD|BYE|PREAUTH)\z/ni
            return response_cond
          when /\A(?:FLAGS)\z/ni
            return flags_response
          when /\A(?:LIST|LSUB|XLIST)\z/ni
            return list_response
          when /\A(?:QUOTA)\z/ni
            return getquota_response
          when /\A(?:QUOTAROOT)\z/ni
            return getquotaroot_response
          when /\A(?:ACL)\z/ni
            return getacl_response
          when /\A(?:SEARCH|SORT)\z/ni
            return search_response
          when /\A(?:THREAD)\z/ni
            return thread_response
          when /\A(?:STATUS)\z/ni
            return status_response
          when /\A(?:CAPABILITY)\z/ni
            return capability_response
          else
            return text_response
          end
        else
          parse_error("unexpected token %s", token.symbol)
        end
      end

def response_tagged
        tag = atom
        match(T_SPACE)
        token = match(T_ATOM)
        name = token.value.upcase
        match(T_SPACE)
        return TaggedResponse.new(tag, name, resp_text, @str)
      end

def response_cond
        token = match(T_ATOM)
        name = token.value.upcase
        match(T_SPACE)
        return UntaggedResponse.new(name, resp_text, @str)
      end

def numeric_response
        n = number
        match(T_SPACE)
        token = match(T_ATOM)
        name = token.value.upcase
        case name
        when "EXISTS", "RECENT", "EXPUNGE"
          return UntaggedResponse.new(name, n, @str)
        when "FETCH"
          shift_token
          match(T_SPACE)
          data = FetchData.new(n, msg_att(n))
          return UntaggedResponse.new(name, data, @str)
        end
      end

def msg_att(n)
        match(T_LPAR)
        attr = {}
        while true
          token = lookahead
          case token.symbol
          when T_RPAR
            shift_token
            break
          when T_SPACE
            shift_token
            next
          end
          case token.value
          when /\A(?:ENVELOPE)\z/ni
            name, val = envelope_data
          when /\A(?:FLAGS)\z/ni
            name, val = flags_data
          when /\A(?:INTERNALDATE)\z/ni
            name, val = internaldate_data
          when /\A(?:RFC822(?:\.HEADER|\.TEXT)?)\z/ni
            name, val = rfc822_text
          when /\A(?:RFC822\.SIZE)\z/ni
            name, val = rfc822_size
          when /\A(?:BODY(?:STRUCTURE)?)\z/ni
            name, val = body_data
          when /\A(?:UID)\z/ni
            name, val = uid_data
          when /\A(?:MODSEQ)\z/ni
            name, val = modseq_data
          else
            parse_error("unknown attribute `%s' for {%d}", token.value, n)
          end
          attr[name] = val
        end
        return attr
      end

def envelope_data
        token = match(T_ATOM)
        name = token.value.upcase
        match(T_SPACE)
        return name, envelope
      end

def envelope
        @lex_state = EXPR_DATA
        token = lookahead
        if token.symbol == T_NIL
          shift_token
          result = nil
        else
          match(T_LPAR)
          date = nstring
          match(T_SPACE)
          subject = nstring
          match(T_SPACE)
          from = address_list
          match(T_SPACE)
          sender = address_list
          match(T_SPACE)
          reply_to = address_list
          match(T_SPACE)
          to = address_list
          match(T_SPACE)
          cc = address_list
          match(T_SPACE)
          bcc = address_list
          match(T_SPACE)
          in_reply_to = nstring
          match(T_SPACE)
          message_id = nstring
          match(T_RPAR)
          result = Envelope.new(date, subject, from, sender, reply_to,
                                to, cc, bcc, in_reply_to, message_id)
        end
        @lex_state = EXPR_BEG
        return result
      end

def flags_data
        token = match(T_ATOM)
        name = token.value.upcase
        match(T_SPACE)
        return name, flag_list
      end

def internaldate_data
        token = match(T_ATOM)
        name = token.value.upcase
        match(T_SPACE)
        token = match(T_QUOTED)
        return name, token.value
      end

def rfc822_text
        token = match(T_ATOM)
        name = token.value.upcase
        token = lookahead
        if token.symbol == T_LBRA
          shift_token
          match(T_RBRA)
        end
        match(T_SPACE)
        return name, nstring
      end

def rfc822_size
        token = match(T_ATOM)
        name = token.value.upcase
        match(T_SPACE)
        return name, number
      end

def body_data
        token = match(T_ATOM)
        name = token.value.upcase
        token = lookahead
        if token.symbol == T_SPACE
          shift_token
          return name, body
        end
        name.concat(section)
        token = lookahead
        if token.symbol == T_ATOM
          name.concat(token.value)
          shift_token
        end
        match(T_SPACE)
        data = nstring
        return name, data
      end

def body
        @lex_state = EXPR_DATA
        token = lookahead
        if token.symbol == T_NIL
          shift_token
          result = nil
        else
          match(T_LPAR)
          token = lookahead
          if token.symbol == T_LPAR
            result = body_type_mpart
          else
            result = body_type_1part
          end
          match(T_RPAR)
        end
        @lex_state = EXPR_BEG
        return result
      end

def body_type_1part
        token = lookahead
        case token.value
        when /\A(?:TEXT)\z/ni
          return body_type_text
        when /\A(?:MESSAGE)\z/ni
          return body_type_msg
        when /\A(?:ATTACHMENT)\z/ni
          return body_type_attachment
        when /\A(?:MIXED)\z/ni
          return body_type_mixed
        else
          return body_type_basic
        end
      end

def body_type_basic
        mtype, msubtype = media_type
        token = lookahead
        if token.symbol == T_RPAR
          return BodyTypeBasic.new(mtype, msubtype)
        end
        match(T_SPACE)
        param, content_id, desc, enc, size = body_fields
        md5, disposition, language, extension = body_ext_1part
        return BodyTypeBasic.new(mtype, msubtype,
                                 param, content_id,
                                 desc, enc, size,
                                 md5, disposition, language, extension)
      end

def body_type_text
        mtype, msubtype = media_type
        match(T_SPACE)
        param, content_id, desc, enc, size = body_fields
        match(T_SPACE)
        lines = number
        md5, disposition, language, extension = body_ext_1part
        return BodyTypeText.new(mtype, msubtype,
                                param, content_id,
                                desc, enc, size,
                                lines,
                                md5, disposition, language, extension)
      end

def body_type_msg
        mtype, msubtype = media_type
        match(T_SPACE)
        param, content_id, desc, enc, size = body_fields

token = lookahead
        if token.symbol == T_RPAR
          # If this is not message/rfc822, we shouldn't apply the RFC822
          # spec to it.  We should handle anything other than
          # message/rfc822 using multipart extension data [rfc3501] (i.e.
          # the data itself won't be returned, we would have to retrieve it
          # with BODYSTRUCTURE instead of with BODY

# Also, sometimes a message/rfc822 is included as a large
          # attachment instead of having all of the other details
          # (e.g. attaching a .eml file to an email)
          if msubtype == "RFC822"
            return BodyTypeMessage.new(mtype, msubtype, param, content_id,
                                       desc, enc, size, nil, nil, nil, nil,
                                       nil, nil, nil)
          else
            return BodyTypeExtension.new(mtype, msubtype,
                                         param, content_id,
                                         desc, enc, size)
          end
        end

match(T_SPACE)
        env = envelope
        match(T_SPACE)
        b = body
        match(T_SPACE)
        lines = number
        md5, disposition, language, extension = body_ext_1part
        return BodyTypeMessage.new(mtype, msubtype,
                                   param, content_id,
                                   desc, enc, size,
                                   env, b, lines,
                                   md5, disposition, language, extension)
      end

def body_type_attachment
        mtype = case_insensitive_string
        match(T_SPACE)
        param = body_fld_param
        return BodyTypeAttachment.new(mtype, nil, param)
      end

def body_type_mixed
        mtype = "MULTIPART"
        msubtype = case_insensitive_string
        param, disposition, language, extension = body_ext_mpart
        return BodyTypeBasic.new(mtype, msubtype, param, nil, nil, nil, nil, nil, disposition, language, extension)
      end

def body_type_mpart
        parts = []
        while true
          token = lookahead
          if token.symbol == T_SPACE
            shift_token
            break
          end
          parts.push(body)
        end
        mtype = "MULTIPART"
        msubtype = case_insensitive_string
        param, disposition, language, extension = body_ext_mpart
        return BodyTypeMultipart.new(mtype, msubtype, parts,
                                     param, disposition, language,
                                     extension)
      end

def media_type
        mtype = case_insensitive_string
        token = lookahead
        if token.symbol != T_SPACE
          return mtype, nil
        end
        match(T_SPACE)
        msubtype = case_insensitive_string
        return mtype, msubtype
      end

def body_fields
        param = body_fld_param
        match(T_SPACE)
        content_id = nstring
        match(T_SPACE)
        desc = nstring
        match(T_SPACE)
        enc = case_insensitive_string
        match(T_SPACE)
        size = number
        return param, content_id, desc, enc, size
      end

def body_fld_param
        token = lookahead
        if token.symbol == T_NIL
          shift_token
          return nil
        end
        match(T_LPAR)
        param = {}
        while true
          token = lookahead
          case token.symbol
          when T_RPAR
            shift_token
            break
          when T_SPACE
            shift_token
          end
          name = case_insensitive_string
          match(T_SPACE)
          val = string
          param[name] = val
        end
        return param
      end

def body_ext_1part
        token = lookahead
        if token.symbol == T_SPACE
          shift_token
        else
          return nil
        end
        md5 = nstring

token = lookahead
        if token.symbol == T_SPACE
          shift_token
        else
          return md5
        end
        disposition = body_fld_dsp

token = lookahead
        if token.symbol == T_SPACE
          shift_token
        else
          return md5, disposition
        end
        language = body_fld_lang

token = lookahead
        if token.symbol == T_SPACE
          shift_token
        else
          return md5, disposition, language
        end

extension = body_extensions
        return md5, disposition, language, extension
      end

def body_ext_mpart
        token = lookahead
        if token.symbol == T_SPACE
          shift_token
        else
          return nil
        end
        param = body_fld_param

token = lookahead
        if token.symbol == T_SPACE
          shift_token
        else
          return param
        end
        disposition = body_fld_dsp

token = lookahead
        if token.symbol == T_SPACE
          shift_token
        else
          return param, disposition
        end
        language = body_fld_lang

token = lookahead
        if token.symbol == T_SPACE
          shift_token
        else
          return param, disposition, language
        end

extension = body_extensions
        return param, disposition, language, extension
      end

def body_fld_dsp
        token = lookahead
        if token.symbol == T_NIL
          shift_token
          return nil
        end
        match(T_LPAR)
        dsp_type = case_insensitive_string
        match(T_SPACE)
        param = body_fld_param
        match(T_RPAR)
        return ContentDisposition.new(dsp_type, param)
      end

def body_fld_lang
        token = lookahead
        if token.symbol == T_LPAR
          shift_token
          result = []
          while true
            token = lookahead
            case token.symbol
            when T_RPAR
              shift_token
              return result
            when T_SPACE
              shift_token
            end
            result.push(case_insensitive_string)
          end
        else
          lang = nstring
          if lang
            return lang.upcase
          else
            return lang
          end
        end
      end

def body_extensions
        result = []
        while true
          token = lookahead
          case token.symbol
          when T_RPAR
            return result
          when T_SPACE
            shift_token
          end
          result.push(body_extension)
        end
      end

def body_extension
        token = lookahead
        case token.symbol
        when T_LPAR
          shift_token
          result = body_extensions
          match(T_RPAR)
          return result
        when T_NUMBER
          return number
        else
          return nstring
        end
      end

def section
        str = String.new
        token = match(T_LBRA)
        str.concat(token.value)
        token = match(T_ATOM, T_NUMBER, T_RBRA)
        if token.symbol == T_RBRA
          str.concat(token.value)
          return str
        end
        str.concat(token.value)
        token = lookahead
        if token.symbol == T_SPACE
          shift_token
          str.concat(token.value)
          token = match(T_LPAR)
          str.concat(token.value)
          while true
            token = lookahead
            case token.symbol
            when T_RPAR
              str.concat(token.value)
              shift_token
              break
            when T_SPACE
              shift_token
              str.concat(token.value)
            end
            str.concat(format_string(astring))
          end
        end
        token = match(T_RBRA)
        str.concat(token.value)
        return str
      end

def format_string(str)
        case str
        when ""
          return '""'
        when /[\x80-\xff\r\n]/n
          # literal
          return "{" + str.bytesize.to_s + "}" + CRLF + str
        when /[(){ \x00-\x1f\x7f%*"\\]/n
          # quoted string
          return '"' + str.gsub(/["\\]/n, "\\\\\\&") + '"'
        else
          # atom
          return str
        end
      end

def uid_data
        token = match(T_ATOM)
        name = token.value.upcase
        match(T_SPACE)
        return name, number
      end

def modseq_data
        token = match(T_ATOM)
        name = token.value.upcase
        match(T_SPACE)
        match(T_LPAR)
        modseq = number
        match(T_RPAR)
        return name, modseq
      end

def text_response
        token = match(T_ATOM)
        name = token.value.upcase
        match(T_SPACE)
        @lex_state = EXPR_TEXT
        token = match(T_TEXT)
        @lex_state = EXPR_BEG
        return UntaggedResponse.new(name, token.value)
      end

def flags_response
        token = match(T_ATOM)
        name = token.value.upcase
        match(T_SPACE)
        return UntaggedResponse.new(name, flag_list, @str)
      end

def list_response
        token = match(T_ATOM)
        name = token.value.upcase
        match(T_SPACE)
        return UntaggedResponse.new(name, mailbox_list, @str)
      end

def mailbox_list
        attr = flag_list
        match(T_SPACE)
        token = match(T_QUOTED, T_NIL)
        if token.symbol == T_NIL
          delim = nil
        else
          delim = token.value
        end
        match(T_SPACE)
        name = astring
        return MailboxList.new(attr, delim, name)
      end

def getquota_response
        # If quota never established, get back
        # `NO Quota root does not exist'.
        # If quota removed, get `()' after the
        # folder spec with no mention of `STORAGE'.
        token = match(T_ATOM)
        name = token.value.upcase
        match(T_SPACE)
        mailbox = astring
        match(T_SPACE)
        match(T_LPAR)
        token = lookahead
        case token.symbol
        when T_RPAR
          shift_token
          data = MailboxQuota.new(mailbox, nil, nil)
          return UntaggedResponse.new(name, data, @str)
        when T_ATOM
          shift_token
          match(T_SPACE)
          token = match(T_NUMBER)
          usage = token.value
          match(T_SPACE)
          token = match(T_NUMBER)
          quota = token.value
          match(T_RPAR)
          data = MailboxQuota.new(mailbox, usage, quota)
          return UntaggedResponse.new(name, data, @str)
        else
          parse_error("unexpected token %s", token.symbol)
        end
      end

def getquotaroot_response
        # Similar to getquota, but only admin can use getquota.
        token = match(T_ATOM)
        name = token.value.upcase
        match(T_SPACE)
        mailbox = astring
        quotaroots = []
        while true
          token = lookahead
          break unless token.symbol == T_SPACE
          shift_token
          quotaroots.push(astring)
        end
        data = MailboxQuotaRoot.new(mailbox, quotaroots)
        return UntaggedResponse.new(name, data, @str)
      end

def getacl_response
        token = match(T_ATOM)
        name = token.value.upcase
        match(T_SPACE)
        mailbox = astring
        data = []
        token = lookahead
        if token.symbol == T_SPACE
          shift_token
          while true
            token = lookahead
            case token.symbol
            when T_CRLF
              break
            when T_SPACE
              shift_token
            end
            user = astring
            match(T_SPACE)
            rights = astring
            data.push(MailboxACLItem.new(user, rights, mailbox))
          end
        end
        return UntaggedResponse.new(name, data, @str)
      end

def search_response
        token = match(T_ATOM)
        name = token.value.upcase
        token = lookahead
        if token.symbol == T_SPACE
          shift_token
          data = []
          while true
            token = lookahead
            case token.symbol
            when T_CRLF
              break
            when T_SPACE
              shift_token
            when T_NUMBER
              data.push(number)
            when T_LPAR
              # TODO: include the MODSEQ value in a response
              shift_token
              match(T_ATOM)
              match(T_SPACE)
              match(T_NUMBER)
              match(T_RPAR)
            end
          end
        else
          data = []
        end
        return UntaggedResponse.new(name, data, @str)
      end

def thread_response
        token = match(T_ATOM)
        name = token.value.upcase
        token = lookahead

if token.symbol == T_SPACE
          threads = []

while true
            shift_token
            token = lookahead

case token.symbol
            when T_LPAR
              threads << thread_branch(token)
            when T_CRLF
              break
            end
          end
        else
          # no member
          threads = []
        end

return UntaggedResponse.new(name, threads, @str)
      end

def thread_branch(token)
        rootmember = nil
        lastmember = nil

while true
          shift_token    # ignore first T_LPAR
          token = lookahead

case token.symbol
          when T_NUMBER
            # new member
            newmember = ThreadMember.new(number, [])
            if rootmember.nil?
              rootmember = newmember
            else
              lastmember.children << newmember
            end
            lastmember = newmember
          when T_SPACE
            # do nothing
          when T_LPAR
            if rootmember.nil?
              # dummy member
              lastmember = rootmember = ThreadMember.new(nil, [])
            end

lastmember.children << thread_branch(token)
          when T_RPAR
            break
          end
        end

return rootmember
      end

def status_response
        token = match(T_ATOM)
        name = token.value.upcase
        match(T_SPACE)
        mailbox = astring
        match(T_SPACE)
        match(T_LPAR)
        attr = {}
        while true
          token = lookahead
          case token.symbol
          when T_RPAR
            shift_token
            break
          when T_SPACE
            shift_token
          end
          token = match(T_ATOM)
          key = token.value.upcase
          match(T_SPACE)
          val = number
          attr[key] = val
        end
        data = StatusData.new(mailbox, attr)
        return UntaggedResponse.new(name, data, @str)
      end

def capability_response
        token = match(T_ATOM)
        name = token.value.upcase
        match(T_SPACE)
        data = []
        while true
          token = lookahead
          case token.symbol
          when T_CRLF
            break
          when T_SPACE
            shift_token
            next
          end
          data.push(atom.upcase)
        end
        return UntaggedResponse.new(name, data, @str)
      end

def resp_text
        @lex_state = EXPR_RTEXT
        token = lookahead
        if token.symbol == T_LBRA
          code = resp_text_code
        else
          code = nil
        end
        token = match(T_TEXT)
        @lex_state = EXPR_BEG
        return ResponseText.new(code, token.value)
      end

def resp_text_code
        @lex_state = EXPR_BEG
        match(T_LBRA)
        token = match(T_ATOM)
        name = token.value.upcase
        case name
        when /\A(?:ALERT|PARSE|READ-ONLY|READ-WRITE|TRYCREATE|NOMODSEQ)\z/n
          result = ResponseCode.new(name, nil)
        when /\A(?:PERMANENTFLAGS)\z/n
          match(T_SPACE)
          result = ResponseCode.new(name, flag_list)
        when /\A(?:UIDVALIDITY|UIDNEXT|UNSEEN)\z/n
          match(T_SPACE)
          result = ResponseCode.new(name, number)
        else
          token = lookahead
          if token.symbol == T_SPACE
            shift_token
            @lex_state = EXPR_CTEXT
            token = match(T_TEXT)
            @lex_state = EXPR_BEG
            result = ResponseCode.new(name, token.value)
          else
            result = ResponseCode.new(name, nil)
          end
        end
        match(T_RBRA)
        @lex_state = EXPR_RTEXT
        return result
      end

def address_list
        token = lookahead
        if token.symbol == T_NIL
          shift_token
          return nil
        else
          result = []
          match(T_LPAR)
          while true
            token = lookahead
            case token.symbol
            when T_RPAR
              shift_token
              break
            when T_SPACE
              shift_token
            end
            result.push(address)
          end
          return result
        end
      end

def address
        match(T_LPAR)
        if @str.index(ADDRESS_REGEXP, @pos)
          # address does not include literal.
          @pos = $~.end(0)
          name = $1
          route = $2
          mailbox = $3
          host = $4
          for s in [name, route, mailbox, host]
            if s
              s.gsub!(/\\(["\\])/n, "\\1")
            end
          end
        else
          name = nstring
          match(T_SPACE)
          route = nstring
          match(T_SPACE)
          mailbox = nstring
          match(T_SPACE)
          host = nstring
          match(T_RPAR)
        end
        return Address.new(name, route, mailbox, host)
      end

FLAG_REGEXP = /\
(?# FLAG        )\\([^\x80-\xff(){ \x00-\x1f\x7f%"\\]+)|\
(?# ATOM        )([^\x80-\xff(){ \x00-\x1f\x7f%*"\\]+)/n

def flag_list
        if @str.index(/$([^)]*)$/ni, @pos)
          @pos = $~.end(0)
          return $1.scan(FLAG_REGEXP).collect { |flag, atom|
            if atom
              atom
            else
              symbol = flag.capitalize.intern
              @flag_symbols[symbol] = true
              if @flag_symbols.length > IMAP.max_flag_count
                raise FlagCountError, "number of flag symbols exceeded"
              end
              symbol
            end
          }
        else
          parse_error("invalid flag list")
        end
      end

def nstring
        token = lookahead
        if token.symbol == T_NIL
          shift_token
          return nil
        else
          return string
        end
      end

def astring
        token = lookahead
        if string_token?(token)
          return string
        else
          return atom
        end
      end

def string
        token = lookahead
        if token.symbol == T_NIL
          shift_token
          return nil
        end
        token = match(T_QUOTED, T_LITERAL)
        return token.value
      end

STRING_TOKENS = [T_QUOTED, T_LITERAL, T_NIL]

def string_token?(token)
        return STRING_TOKENS.include?(token.symbol)
      end

def case_insensitive_string
        token = lookahead
        if token.symbol == T_NIL
          shift_token
          return nil
        end
        token = match(T_QUOTED, T_LITERAL)
        return token.value.upcase
      end

def atom
        result = String.new
        while true
          token = lookahead
          if atom_token?(token)
            result.concat(token.value)
            shift_token
          else
            if result.empty?
              parse_error("unexpected token %s", token.symbol)
            else
              return result
            end
          end
        end
      end

ATOM_TOKENS = [
        T_ATOM,
        T_NUMBER,
        T_NIL,
        T_LBRA,
        T_RBRA,
        T_PLUS
      ]

def atom_token?(token)
        return ATOM_TOKENS.include?(token.symbol)
      end

def number
        token = lookahead
        if token.symbol == T_NIL
          shift_token
          return nil
        end
        token = match(T_NUMBER)
        return token.value.to_i
      end

def nil_atom
        match(T_NIL)
        return nil
      end

def match(*args)
        token = lookahead
        unless args.include?(token.symbol)
          parse_error('unexpected token %s (expected %s)',
                      token.symbol.id2name,
                      args.collect {|i| i.id2name}.join(" or "))
        end
        shift_token
        return token
      end

def lookahead
        unless @token
          @token = next_token
        end
        return @token
      end

def shift_token
        @token = nil
      end

def next_token
        case @lex_state
        when EXPR_BEG
          if @str.index(BEG_REGEXP, @pos)
            @pos = $~.end(0)
            if $1
              return Token.new(T_SPACE, $+)
            elsif $2
              return Token.new(T_NIL, $+)
            elsif $3
              return Token.new(T_NUMBER, $+)
            elsif $4
              return Token.new(T_ATOM, $+)
            elsif $5
              return Token.new(T_QUOTED,
                               $+.gsub(/\\(["\\])/n, "\\1"))
            elsif $6
              return Token.new(T_LPAR, $+)
            elsif $7
              return Token.new(T_RPAR, $+)
            elsif $8
              return Token.new(T_BSLASH, $+)
            elsif $9
              return Token.new(T_STAR, $+)
            elsif $10
              return Token.new(T_LBRA, $+)
            elsif $11
              return Token.new(T_RBRA, $+)
            elsif $12
              len = $+.to_i
              val = @str[@pos, len]
              @pos += len
              return Token.new(T_LITERAL, val)
            elsif $13
              return Token.new(T_PLUS, $+)
            elsif $14
              return Token.new(T_PERCENT, $+)
            elsif $15
              return Token.new(T_CRLF, $+)
            elsif $16
              return Token.new(T_EOF, $+)
            else
              parse_error("[Net::IMAP BUG] BEG_REGEXP is invalid")
            end
          else
            @str.index(/\S*/n, @pos)
            parse_error("unknown token - %s", $&.dump)
          end
        when EXPR_DATA
          if @str.index(DATA_REGEXP, @pos)
            @pos = $~.end(0)
            if $1
              return Token.new(T_SPACE, $+)
            elsif $2
              return Token.new(T_NIL, $+)
            elsif $3
              return Token.new(T_NUMBER, $+)
            elsif $4
              return Token.new(T_QUOTED,
                               $+.gsub(/\\(["\\])/n, "\\1"))
            elsif $5
              len = $+.to_i
              val = @str[@pos, len]
              @pos += len
              return Token.new(T_LITERAL, val)
            elsif $6
              return Token.new(T_LPAR, $+)
            elsif $7
              return Token.new(T_RPAR, $+)
            else
              parse_error("[Net::IMAP BUG] DATA_REGEXP is invalid")
            end
          else
            @str.index(/\S*/n, @pos)
            parse_error("unknown token - %s", $&.dump)
          end
        when EXPR_TEXT
          if @str.index(TEXT_REGEXP, @pos)
            @pos = $~.end(0)
            if $1
              return Token.new(T_TEXT, $+)
            else
              parse_error("[Net::IMAP BUG] TEXT_REGEXP is invalid")
            end
          else
            @str.index(/\S*/n, @pos)
            parse_error("unknown token - %s", $&.dump)
          end
        when EXPR_RTEXT
          if @str.index(RTEXT_REGEXP, @pos)
            @pos = $~.end(0)
            if $1
              return Token.new(T_LBRA, $+)
            elsif $2
              return Token.new(T_TEXT, $+)
            else
              parse_error("[Net::IMAP BUG] RTEXT_REGEXP is invalid")
            end
          else
            @str.index(/\S*/n, @pos)
            parse_error("unknown token - %s", $&.dump)
          end
        when EXPR_CTEXT
          if @str.index(CTEXT_REGEXP, @pos)
            @pos = $~.end(0)
            if $1
              return Token.new(T_TEXT, $+)
            else
              parse_error("[Net::IMAP BUG] CTEXT_REGEXP is invalid")
            end
          else
            @str.index(/\S*/n, @pos) #/
            parse_error("unknown token - %s", $&.dump)
          end
        else
          parse_error("invalid @lex_state - %s", @lex_state.inspect)
        end
      end

def parse_error(fmt, *args)
        if IMAP.debug
          $stderr.printf("@str: %s\n", @str.dump)
          $stderr.printf("@pos: %d\n", @pos)
          $stderr.printf("@lex_state: %s\n", @lex_state)
          if @token
            $stderr.printf("@token.symbol: %s\n", @token.symbol)
            $stderr.printf("@token.value: %s\n", @token.value.inspect)
          end
        end
        raise ResponseParseError, format(fmt, *args)
      end
    end

# Authenticator for the "LOGIN" authentication type.  See
    # #authenticate().
    class LoginAuthenticator
      def process(data)
        case @state
        when STATE_USER
          @state = STATE_PASSWORD
          return @user
        when STATE_PASSWORD
          return @password
        end
      end

private

STATE_USER = :USER
      STATE_PASSWORD = :PASSWORD

def initialize(user, password)
        @user = user
        @password = password
        @state = STATE_USER
      end
    end
    add_authenticator "LOGIN", LoginAuthenticator

# Authenticator for the "PLAIN" authentication type.  See
    # #authenticate().
    class PlainAuthenticator
      def process(data)
        return "\0#{@user}\0#{@password}"
      end

private

def initialize(user, password)
        @user = user
        @password = password
      end
    end
    add_authenticator "PLAIN", PlainAuthenticator

# Authenticator for the "CRAM-MD5" authentication type.  See
    # #authenticate().
    class CramMD5Authenticator
      def process(challenge)
        digest = hmac_md5(challenge, @password)
        return @user + " " + digest
      end

private

def initialize(user, password)
        @user = user
        @password = password
      end

def hmac_md5(text, key)
        if key.length > 64
          key = Digest::MD5.digest(key)
        end

k_ipad = key + "\0" * (64 - key.length)
        k_opad = key + "\0" * (64 - key.length)
        for i in 0..63
          k_ipad[i] = (k_ipad[i].ord ^ 0x36).chr
          k_opad[i] = (k_opad[i].ord ^ 0x5c).chr
        end

digest = Digest::MD5.digest(k_ipad + text)

return Digest::MD5.hexdigest(k_opad + digest)
      end
    end
    add_authenticator "CRAM-MD5", CramMD5Authenticator

# Authenticator for the "DIGEST-MD5" authentication type.  See
    # #authenticate().
    class DigestMD5Authenticator
      def process(challenge)
        case @stage
        when STAGE_ONE
          @stage = STAGE_TWO
          sparams = {}
          c = StringScanner.new(challenge)
          while c.scan(/(?:\s*,)?\s*(\w+)=("(?:[^\\"]+|\\.)*"|[^,]+)\s*/)
            k, v = c[1], c[2]
            if v =~ /^"(.*)"$/
              v = $1
              if v =~ /,/
                v = v.split(',')
              end
            end
            sparams[k] = v
          end

raise DataFormatError, "Bad Challenge: '#{challenge}'" unless c.rest.size == 0
          raise Error, "Server does not support auth (qop = #{sparams['qop'].join(',')})" unless sparams['qop'].include?("auth")

response = {
            :nonce => sparams['nonce'],
            :username => @user,
            :realm => sparams['realm'],
            :cnonce => Digest::MD5.hexdigest("%.15f:%.15f:%d" % [Time.now.to_f, rand, Process.pid.to_s]),
            :'digest-uri' => 'imap/' + sparams['realm'],
            :qop => 'auth',
            :maxbuf => 65535,
            :nc => "%08d" % nc(sparams['nonce']),
            :charset => sparams['charset'],
          }

response[:authzid] = @authname unless @authname.nil?

# now, the real thing
          a0 = Digest::MD5.digest( [ response.values_at(:username, :realm), @password ].join(':') )

a1 = [ a0, response.values_at(:nonce,:cnonce) ].join(':')
          a1 << ':' + response[:authzid] unless response[:authzid].nil?

a2 = "AUTHENTICATE:" + response[:'digest-uri']
          a2 << ":00000000000000000000000000000000" if response[:qop] and response[:qop] =~ /^auth-(?:conf|int)$/

response[:response] = Digest::MD5.hexdigest(
            [
             Digest::MD5.hexdigest(a1),
             response.values_at(:nonce, :nc, :cnonce, :qop),
             Digest::MD5.hexdigest(a2)
            ].join(':')
          )

return response.keys.map {|key| qdval(key.to_s, response[key]) }.join(',')
        when STAGE_TWO
          @stage = nil
          # if at the second stage, return an empty string
          if challenge =~ /rspauth=/
            return ''
          else
            raise ResponseParseError, challenge
          end
        else
          raise ResponseParseError, challenge
        end
      end

def initialize(user, password, authname = nil)
        @user, @password, @authname = user, password, authname
        @nc, @stage = {}, STAGE_ONE
      end

private

STAGE_ONE = :stage_one
      STAGE_TWO = :stage_two

def nc(nonce)
        if @nc.has_key? nonce
          @nc[nonce] = @nc[nonce] + 1
        else
          @nc[nonce] = 1
        end
        return @nc[nonce]
      end

# some responses need quoting
      def qdval(k, v)
        return if k.nil? or v.nil?
        if %w"username authzid realm nonce cnonce digest-uri qop".include? k
          v.gsub!(/([\\"])/, "\\\1")
          return '%s="%s"' % [k, v]
        else
          return '%s=%s' % [k, v]
        end
      end
    end
    add_authenticator "DIGEST-MD5", DigestMD5Authenticator

# Superclass of IMAP errors.
    class Error < StandardError
    end

# Error raised when data is in the incorrect format.
    class DataFormatError < Error
    end

# Error raised when a response from the server is non-parseable.
    class ResponseParseError < Error
    end

# Superclass of all errors used to encapsulate "fail" responses
    # from the server.
    class ResponseError < Error

# The response that caused this error
      attr_accessor :response

def initialize(response)
        @response = response

super @response.data.text
      end

end

# Error raised upon a "NO" response from the server, indicating
    # that the client command could not be completed successfully.
    class NoResponseError < ResponseError
    end

# Error raised upon a "BAD" response from the server, indicating
    # that the client command violated the IMAP protocol, or an internal
    # server failure has occurred.
    class BadResponseError < ResponseError
    end

# Error raised upon a "BYE" response from the server, indicating
    # that the client is not being allowed to login, or has been timed
    # out due to inactivity.
    class ByeResponseError < ResponseError
    end

# Error raised upon an unknown response from the server.
    class UnknownResponseError < ResponseError
    end

RESPONSE_ERRORS = Hash.new(ResponseError)
    RESPONSE_ERRORS["NO"] = NoResponseError
    RESPONSE_ERRORS["BAD"] = BadResponseError

# Error raised when too many flags are interned to symbols.
    class FlagCountError < Error
    end
  end
end

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