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Edit File : httpproxy.rb \| Size : 7.46 KB
# # httpproxy.rb -- HTTPProxy Class # # Author: IPR -- Internet Programming with Ruby -- writers # Copyright (c) 2002 GOTO Kentaro # Copyright (c) 2002 Internet Programming with Ruby writers. All rights # reserved. # # $IPR: httpproxy.rb,v 1.18 2003/03/08 18:58:10 gotoyuzo Exp $ # $kNotwork: straw.rb,v 1.3 2002/02/12 15:13:07 gotoken Exp $ require "webrick/httpserver" require "net/http" Net::HTTP::version_1_2 if RUBY_VERSION < "1.7" module WEBrick NullReader = Object.new class << NullReader def read(args) nil end alias gets read end class HTTPProxyServer < HTTPServer def initialize(config) super c = @config @via = "#{c[:HTTPVersion]} #{c[:ServerName]}:#{c[:Port]}" end def service(req, res) if req.request_method == "CONNECT" proxy_connect(req, res) elsif req.unparsed_uri =~ %r!^http://! proxy_service(req, res) else super(req, res) end end def proxy_auth(req, res) if proc = @config[:ProxyAuthProc] proc.call(req, res) end req.header.delete("proxy-authorization") end # Some header fields should not be transferred. HopByHop = %w( connection keep-alive proxy-authenticate upgrade proxy-authorization te trailers transfer-encoding ) ShouldNotTransfer = %w( set-cookie proxy-connection ) def split_field(f) f ? f.split(/,\s+/).collect{\|i\| i.downcase } : [] end def choose_header(src, dst) connections = split_field(src['connection']) src.each{\|key, value\| key = key.downcase if HopByHop.member?(key) \|\| # RFC2616: 13.5.1 connections.member?(key) \|\| # RFC2616: 14.10 ShouldNotTransfer.member?(key) # pragmatics @logger.debug("choose_header: `#{key}: #{value}'") next end dst[key] = value } end # Net::HTTP is stupid about the multiple header fields. # Here is workaround: def set_cookie(src, dst) if str = src['set-cookie'] cookies = [] str.split(/,\s/).each{\|token\| if /^[^=]+;/o =~ token cookies[-1] << ", " << token elsif /=/o =~ token cookies << token else cookies[-1] << ", " << token end } dst.cookies.replace(cookies) end end def set_via(h) if @config[:ProxyVia] if h['via'] h['via'] << ", " << @via else h['via'] = @via end end end def proxy_uri(req, res) @config[:ProxyURI] end def proxy_service(req, res) # Proxy Authentication proxy_auth(req, res) # Create Request-URI to send to the origin server uri = req.request_uri path = uri.path.dup path << "?" << uri.query if uri.query # Choose header fields to transfer header = Hash.new choose_header(req, header) set_via(header) # select upstream proxy server if proxy = proxy_uri(req, res) proxy_host = proxy.host proxy_port = proxy.port if proxy.userinfo credentials = "Basic " + [proxy.userinfo].pack("m") credentials.chomp! header['proxy-authorization'] = credentials end end response = nil begin http = Net::HTTP.new(uri.host, uri.port, proxy_host, proxy_port) http.start{ if @config[:ProxyTimeout] ################################## these issues are http.open_timeout = 30 # secs # necessary (maybe bacause http.read_timeout = 60 # secs # Ruby's bug, but why?) ################################## end case req.request_method when "GET" then response = http.get(path, header) when "POST" then response = http.post(path, req.body \|\| "", header) when "HEAD" then response = http.head(path, header) else raise HTTPStatus::MethodNotAllowed, "unsupported method `#{req.request_method}'." end } rescue => err logger.debug("#{err.class}: #{err.message}") raise HTTPStatus::ServiceUnavailable, err.message end # Persistent connction requirements are mysterious for me. # So I will close the connection in every response. res['proxy-connection'] = "close" res['connection'] = "close" # Convert Net::HTTP::HTTPResponse to WEBrick::HTTPProxy res.status = response.code.to_i choose_header(response, res) set_cookie(response, res) set_via(res) res.body = response.body # Process contents if handler = @config[:ProxyContentHandler] handler.call(req, res) end end def proxy_connect(req, res) # Proxy Authentication proxy_auth(req, res) ua = Thread.current[:WEBrickSocket] # User-Agent raise HTTPStatus::InternalServerError, "[BUG] cannot get socket" unless ua host, port = req.unparsed_uri.split(":", 2) # Proxy authentication for upstream proxy server if proxy = proxy_uri(req, res) proxy_request_line = "CONNECT #{host}:#{port} HTTP/1.0" if proxy.userinfo credentials = "Basic " + [proxy.userinfo].pack("m") credentials.chomp! end host, port = proxy.host, proxy.port end begin @logger.debug("CONNECT: upstream proxy is `#{host}:#{port}'.") os = TCPSocket.new(host, port) # origin server if proxy @logger.debug("CONNECT: sending a Request-Line") os << proxy_request_line << CRLF @logger.debug("CONNECT: > #{proxy_request_line}") if credentials @logger.debug("CONNECT: sending a credentials") os << "Proxy-Authorization: " << credentials << CRLF end os << CRLF proxy_status_line = os.gets(LF) @logger.debug("CONNECT: read a Status-Line form the upstream server") @logger.debug("CONNECT: < #{proxy_status_line}") if %r{^HTTP/\d+\.\d+\s+200\s*} =~ proxy_status_line while line = os.gets(LF) break if /\A(#{CRLF}\|#{LF})\z/om =~ line end else raise HTTPStatus::BadGateway end end @logger.debug("CONNECT #{host}:#{port}: succeeded") res.status = HTTPStatus::RC_OK rescue => ex @logger.debug("CONNECT #{host}:#{port}: failed `#{ex.message}'") res.set_error(ex) raise HTTPStatus::EOFError ensure if handler = @config[:ProxyContentHandler] handler.call(req, res) end res.send_response(ua) access_log(@config, req, res) # Should clear request-line not to send the sesponse twice. # see: HTTPServer#run req.parse(NullReader) rescue nil end begin while fds = IO::select([ua, os]) if fds[0].member?(ua) buf = ua.sysread(1024); @logger.debug("CONNECT: #{buf.size} byte from User-Agent") os.syswrite(buf) elsif fds[0].member?(os) buf = os.sysread(1024); @logger.debug("CONNECT: #{buf.size} byte from #{host}:#{port}") ua.syswrite(buf) end end rescue => ex os.close @logger.debug("CONNECT #{host}:#{port}: closed") end raise HTTPStatus::EOFError end def do_OPTIONS(req, res) res['allow'] = "GET,HEAD,POST,OPTIONS,CONNECT" end end end Back

Edit File : httpproxy.rb | Size : 7.46 KB

#
# httpproxy.rb -- HTTPProxy Class
#
# Author: IPR -- Internet Programming with Ruby -- writers
# Copyright (c) 2002 GOTO Kentaro
# Copyright (c) 2002 Internet Programming with Ruby writers. All rights
# reserved.
#
# $IPR: httpproxy.rb,v 1.18 2003/03/08 18:58:10 gotoyuzo Exp $
# $kNotwork: straw.rb,v 1.3 2002/02/12 15:13:07 gotoken Exp $

require "webrick/httpserver"
require "net/http"

Net::HTTP::version_1_2 if RUBY_VERSION < "1.7"

module WEBrick
  NullReader = Object.new
  class << NullReader
    def read(*args)
      nil
    end
    alias gets read
  end

class HTTPProxyServer < HTTPServer
    def initialize(config)
      super
      c = @config
      @via = "#{c[:HTTPVersion]} #{c[:ServerName]}:#{c[:Port]}"
    end

def service(req, res)
      if req.request_method == "CONNECT"
        proxy_connect(req, res)
      elsif req.unparsed_uri =~ %r!^http://!
        proxy_service(req, res)
      else
        super(req, res)
      end
    end

def proxy_auth(req, res)
      if proc = @config[:ProxyAuthProc]
        proc.call(req, res)
      end
      req.header.delete("proxy-authorization")
    end

# Some header fields should not be transferred.
    HopByHop = %w( connection keep-alive proxy-authenticate upgrade
                   proxy-authorization te trailers transfer-encoding )
    ShouldNotTransfer = %w( set-cookie proxy-connection )
    def split_field(f) f ? f.split(/,\s+/).collect{|i| i.downcase } : [] end

def choose_header(src, dst)
      connections = split_field(src['connection'])
      src.each{|key, value|
        key = key.downcase
        if HopByHop.member?(key)          || # RFC2616: 13.5.1
           connections.member?(key)       || # RFC2616: 14.10
           ShouldNotTransfer.member?(key)    # pragmatics
          @logger.debug("choose_header: `#{key}: #{value}'")
          next
        end
        dst[key] = value
      }
    end

# Net::HTTP is stupid about the multiple header fields.
    # Here is workaround:
    def set_cookie(src, dst)
      if str = src['set-cookie']
        cookies = []
        str.split(/,\s*/).each{|token|
          if /^[^=]+;/o =~ token
            cookies[-1] << ", " << token
          elsif /=/o =~ token
            cookies << token
          else
            cookies[-1] << ", " << token
          end
        }
        dst.cookies.replace(cookies)
      end
    end

def set_via(h)
      if @config[:ProxyVia]
        if  h['via']
          h['via'] << ", " << @via
        else
          h['via'] = @via
        end
      end
    end

def proxy_uri(req, res)
      @config[:ProxyURI]
    end

def proxy_service(req, res)
      # Proxy Authentication
      proxy_auth(req, res)

# Create Request-URI to send to the origin server
      uri  = req.request_uri
      path = uri.path.dup
      path << "?" << uri.query if uri.query

# Choose header fields to transfer
      header = Hash.new
      choose_header(req, header)
      set_via(header)

# select upstream proxy server
      if proxy = proxy_uri(req, res)
        proxy_host = proxy.host
        proxy_port = proxy.port
        if proxy.userinfo
          credentials = "Basic " + [proxy.userinfo].pack("m*")
          credentials.chomp!
          header['proxy-authorization'] = credentials
        end
      end

response = nil
      begin
        http = Net::HTTP.new(uri.host, uri.port, proxy_host, proxy_port)
        http.start{
          if @config[:ProxyTimeout]
            ##################################   these issues are 
            http.open_timeout = 30   # secs  #   necessary (maybe bacause
            http.read_timeout = 60   # secs  #   Ruby's bug, but why?)
            ##################################
          end
          case req.request_method
          when "GET"  then response = http.get(path, header)
          when "POST" then response = http.post(path, req.body || "", header)
          when "HEAD" then response = http.head(path, header)
          else
            raise HTTPStatus::MethodNotAllowed,
              "unsupported method `#{req.request_method}'."
          end
        }
      rescue => err
        logger.debug("#{err.class}: #{err.message}")
        raise HTTPStatus::ServiceUnavailable, err.message
      end
  
      # Persistent connction requirements are mysterious for me.
      # So I will close the connection in every response.
      res['proxy-connection'] = "close"
      res['connection'] = "close"

# Convert Net::HTTP::HTTPResponse to WEBrick::HTTPProxy
      res.status = response.code.to_i
      choose_header(response, res)
      set_cookie(response, res)
      set_via(res)
      res.body = response.body

# Process contents
      if handler = @config[:ProxyContentHandler]
        handler.call(req, res)
      end
    end

def proxy_connect(req, res)
      # Proxy Authentication
      proxy_auth(req, res)

ua = Thread.current[:WEBrickSocket]  # User-Agent
      raise HTTPStatus::InternalServerError,
        "[BUG] cannot get socket" unless ua

host, port = req.unparsed_uri.split(":", 2)
      # Proxy authentication for upstream proxy server
      if proxy = proxy_uri(req, res)
        proxy_request_line = "CONNECT #{host}:#{port} HTTP/1.0"
        if proxy.userinfo
          credentials = "Basic " + [proxy.userinfo].pack("m*")
          credentials.chomp!
        end
        host, port = proxy.host, proxy.port
      end

begin
        @logger.debug("CONNECT: upstream proxy is `#{host}:#{port}'.")
        os = TCPSocket.new(host, port)     # origin server

if proxy
          @logger.debug("CONNECT: sending a Request-Line")
          os << proxy_request_line << CRLF
          @logger.debug("CONNECT: > #{proxy_request_line}")
          if credentials
            @logger.debug("CONNECT: sending a credentials")
            os << "Proxy-Authorization: " << credentials << CRLF
          end
          os << CRLF
          proxy_status_line = os.gets(LF)
          @logger.debug("CONNECT: read a Status-Line form the upstream server")
          @logger.debug("CONNECT: < #{proxy_status_line}")
          if %r{^HTTP/\d+\.\d+\s+200\s*} =~ proxy_status_line
            while line = os.gets(LF)
              break if /\A(#{CRLF}|#{LF})\z/om =~ line
            end
          else
            raise HTTPStatus::BadGateway
          end
        end
        @logger.debug("CONNECT #{host}:#{port}: succeeded")
        res.status = HTTPStatus::RC_OK
      rescue => ex
        @logger.debug("CONNECT #{host}:#{port}: failed `#{ex.message}'")
        res.set_error(ex)
        raise HTTPStatus::EOFError
      ensure
        if handler = @config[:ProxyContentHandler]
          handler.call(req, res)
        end
        res.send_response(ua)
        access_log(@config, req, res)

# Should clear request-line not to send the sesponse twice.
        # see: HTTPServer#run
        req.parse(NullReader) rescue nil
      end

begin
        while fds = IO::select([ua, os])
          if fds[0].member?(ua)
            buf = ua.sysread(1024);
            @logger.debug("CONNECT: #{buf.size} byte from User-Agent")
            os.syswrite(buf)
          elsif fds[0].member?(os)
            buf = os.sysread(1024);
            @logger.debug("CONNECT: #{buf.size} byte from #{host}:#{port}")
            ua.syswrite(buf)
          end
        end
      rescue => ex
        os.close
        @logger.debug("CONNECT #{host}:#{port}: closed")
      end

raise HTTPStatus::EOFError
    end

def do_OPTIONS(req, res)
      res['allow'] = "GET,HEAD,POST,OPTIONS,CONNECT"
    end
  end
end

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