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Edit File : gopher.py \| Size : 9.55 KB
#! /usr/bin/python2.7 # A simple gopher client. # # Usage: gopher [ [selector] host [port] ] import string import sys import os import socket # Default selector, host and port DEF_SELECTOR = '' DEF_HOST = 'gopher.micro.umn.edu' DEF_PORT = 70 # Recognized file types T_TEXTFILE = '0' T_MENU = '1' T_CSO = '2' T_ERROR = '3' T_BINHEX = '4' T_DOS = '5' T_UUENCODE = '6' T_SEARCH = '7' T_TELNET = '8' T_BINARY = '9' T_REDUNDANT = '+' T_SOUND = 's' # Dictionary mapping types to strings typename = {'0': '<TEXT>', '1': '<DIR>', '2': '<CSO>', '3': '<ERROR>', \ '4': '<BINHEX>', '5': '<DOS>', '6': '<UUENCODE>', '7': '<SEARCH>', \ '8': '<TELNET>', '9': '<BINARY>', '+': '<REDUNDANT>', 's': '<SOUND>'} # Oft-used characters and strings CRLF = '\r\n' TAB = '\t' # Open a TCP connection to a given host and port def open_socket(host, port): if not port: port = DEF_PORT elif type(port) == type(''): port = string.atoi(port) s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((host, port)) return s # Send a selector to a given host and port, return a file with the reply def send_request(selector, host, port): s = open_socket(host, port) s.send(selector + CRLF) s.shutdown(1) return s.makefile('r') # Get a menu in the form of a list of entries def get_menu(selector, host, port): f = send_request(selector, host, port) list = [] while 1: line = f.readline() if not line: print '(Unexpected EOF from server)' break if line[-2:] == CRLF: line = line[:-2] elif line[-1:] in CRLF: line = line[:-1] if line == '.': break if not line: print '(Empty line from server)' continue typechar = line[0] parts = string.splitfields(line[1:], TAB) if len(parts) < 4: print '(Bad line from server: %r)' % (line,) continue if len(parts) > 4: print '(Extra info from server: %r)' % (parts[4:],) parts.insert(0, typechar) list.append(parts) f.close() return list # Get a text file as a list of lines, with trailing CRLF stripped def get_textfile(selector, host, port): list = [] get_alt_textfile(selector, host, port, list.append) return list # Get a text file and pass each line to a function, with trailing CRLF stripped def get_alt_textfile(selector, host, port, func): f = send_request(selector, host, port) while 1: line = f.readline() if not line: print '(Unexpected EOF from server)' break if line[-2:] == CRLF: line = line[:-2] elif line[-1:] in CRLF: line = line[:-1] if line == '.': break if line[:2] == '..': line = line[1:] func(line) f.close() # Get a binary file as one solid data block def get_binary(selector, host, port): f = send_request(selector, host, port) data = f.read() f.close() return data # Get a binary file and pass each block to a function def get_alt_binary(selector, host, port, func, blocksize): f = send_request(selector, host, port) while 1: data = f.read(blocksize) if not data: break func(data) # A very simple interactive browser # Browser main command, has default arguments def browser(args): selector = DEF_SELECTOR host = DEF_HOST port = DEF_PORT n = len(args) if n > 0 and args[0]: selector = args[0] if n > 1 and args[1]: host = args[1] if n > 2 and args[2]: port = args[2] if n > 3: raise RuntimeError, 'too many args' try: browse_menu(selector, host, port) except socket.error, msg: print 'Socket error:', msg sys.exit(1) except KeyboardInterrupt: print '\n[Goodbye]' # Browse a menu def browse_menu(selector, host, port): list = get_menu(selector, host, port) while 1: print '----- MENU -----' print 'Selector:', repr(selector) print 'Host:', host, ' Port:', port print for i in range(len(list)): item = list[i] typechar, description = item[0], item[1] print string.rjust(repr(i+1), 3) + ':', description, if typename.has_key(typechar): print typename[typechar] else: print '<TYPE=' + repr(typechar) + '>' print while 1: try: str = raw_input('Choice [CR == up a level]: ') except EOFError: print return if not str: return try: choice = string.atoi(str) except string.atoi_error: print 'Choice must be a number; try again:' continue if not 0 < choice <= len(list): print 'Choice out of range; try again:' continue break item = list[choice-1] typechar = item[0] [i_selector, i_host, i_port] = item[2:5] if typebrowser.has_key(typechar): browserfunc = typebrowser[typechar] try: browserfunc(i_selector, i_host, i_port) except (IOError, socket.error): print '*', sys.exc_type, ':', sys.exc_value else: print 'Unsupported object type' # Browse a text file def browse_textfile(selector, host, port): x = None try: p = os.popen('${PAGER-more}', 'w') x = SaveLines(p) get_alt_textfile(selector, host, port, x.writeln) except IOError, msg: print 'IOError:', msg if x: x.close() f = open_savefile() if not f: return x = SaveLines(f) try: get_alt_textfile(selector, host, port, x.writeln) print 'Done.' except IOError, msg: print 'IOError:', msg x.close() # Browse a search index def browse_search(selector, host, port): while 1: print '----- SEARCH -----' print 'Selector:', repr(selector) print 'Host:', host, ' Port:', port print try: query = raw_input('Query [CR == up a level]: ') except EOFError: print break query = string.strip(query) if not query: break if '\t' in query: print 'Sorry, queries cannot contain tabs' continue browse_menu(selector + TAB + query, host, port) # "Browse" telnet-based information, i.e. open a telnet session def browse_telnet(selector, host, port): if selector: print 'Log in as', repr(selector) if type(port) <> type(''): port = repr(port) sts = os.system('set -x; exec telnet ' + host + ' ' + port) if sts: print 'Exit status:', sts # "Browse" a binary file, i.e. save it to a file def browse_binary(selector, host, port): f = open_savefile() if not f: return x = SaveWithProgress(f) get_alt_binary(selector, host, port, x.write, 81024) x.close() # "Browse" a sound file, i.e. play it or save it def browse_sound(selector, host, port): browse_binary(selector, host, port) # Dictionary mapping types to browser functions typebrowser = {'0': browse_textfile, '1': browse_menu, \ '4': browse_binary, '5': browse_binary, '6': browse_textfile, \ '7': browse_search, \ '8': browse_telnet, '9': browse_binary, 's': browse_sound} # Class used to save lines, appending a newline to each line class SaveLines: def __init__(self, f): self.f = f def writeln(self, line): self.f.write(line + '\n') def close(self): sts = self.f.close() if sts: print 'Exit status:', sts # Class used to save data while showing progress class SaveWithProgress: def __init__(self, f): self.f = f def write(self, data): sys.stdout.write('#') sys.stdout.flush() self.f.write(data) def close(self): print sts = self.f.close() if sts: print 'Exit status:', sts # Ask for and open a save file, or return None if not to save def open_savefile(): try: savefile = raw_input( \ 'Save as file [CR == don\'t save; \|pipeline or ~user/... OK]: ') except EOFError: print return None savefile = string.strip(savefile) if not savefile: return None if savefile[0] == '\|': cmd = string.strip(savefile[1:]) try: p = os.popen(cmd, 'w') except IOError, msg: print repr(cmd), ':', msg return None print 'Piping through', repr(cmd), '...' return p if savefile[0] == '~': savefile = os.path.expanduser(savefile) try: f = open(savefile, 'w') except IOError, msg: print repr(savefile), ':', msg return None print 'Saving to', repr(savefile), '...' return f # Test program def test(): if sys.argv[4:]: print 'usage: gopher [ [selector] host [port] ]' sys.exit(2) elif sys.argv[3:]: browser(sys.argv[1], sys.argv[2], sys.argv[3]) elif sys.argv[2:]: try: port = string.atoi(sys.argv[2]) selector = '' host = sys.argv[1] except string.atoi_error: selector = sys.argv[1] host = sys.argv[2] port = '' browser(selector, host, port) elif sys.argv[1:]: browser('', sys.argv[1]) else: browser() # Call the test program as a main program test() Back

Edit File : gopher.py | Size : 9.55 KB

#! /usr/bin/python2.7

# A simple gopher client.
#
# Usage: gopher [ [selector] host [port] ]

import string
import sys
import os
import socket

# Default selector, host and port
DEF_SELECTOR = ''
DEF_HOST     = 'gopher.micro.umn.edu'
DEF_PORT     = 70

# Recognized file types
T_TEXTFILE  = '0'
T_MENU      = '1'
T_CSO       = '2'
T_ERROR     = '3'
T_BINHEX    = '4'
T_DOS       = '5'
T_UUENCODE  = '6'
T_SEARCH    = '7'
T_TELNET    = '8'
T_BINARY    = '9'
T_REDUNDANT = '+'
T_SOUND     = 's'

# Dictionary mapping types to strings
typename = {'0': '<TEXT>', '1': '<DIR>', '2': '<CSO>', '3': '<ERROR>', \
        '4': '<BINHEX>', '5': '<DOS>', '6': '<UUENCODE>', '7': '<SEARCH>', \
        '8': '<TELNET>', '9': '<BINARY>', '+': '<REDUNDANT>', 's': '<SOUND>'}

# Oft-used characters and strings
CRLF = '\r\n'
TAB = '\t'

# Open a TCP connection to a given host and port
def open_socket(host, port):
    if not port:
        port = DEF_PORT
    elif type(port) == type(''):
        port = string.atoi(port)
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect((host, port))
    return s

# Send a selector to a given host and port, return a file with the reply
def send_request(selector, host, port):
    s = open_socket(host, port)
    s.send(selector + CRLF)
    s.shutdown(1)
    return s.makefile('r')

# Get a menu in the form of a list of entries
def get_menu(selector, host, port):
    f = send_request(selector, host, port)
    list = []
    while 1:
        line = f.readline()
        if not line:
            print '(Unexpected EOF from server)'
            break
        if line[-2:] == CRLF:
            line = line[:-2]
        elif line[-1:] in CRLF:
            line = line[:-1]
        if line == '.':
            break
        if not line:
            print '(Empty line from server)'
            continue
        typechar = line[0]
        parts = string.splitfields(line[1:], TAB)
        if len(parts) < 4:
            print '(Bad line from server: %r)' % (line,)
            continue
        if len(parts) > 4:
            print '(Extra info from server: %r)' % (parts[4:],)
        parts.insert(0, typechar)
        list.append(parts)
    f.close()
    return list

# Get a text file as a list of lines, with trailing CRLF stripped
def get_textfile(selector, host, port):
    list = []
    get_alt_textfile(selector, host, port, list.append)
    return list

# Get a text file and pass each line to a function, with trailing CRLF stripped
def get_alt_textfile(selector, host, port, func):
    f = send_request(selector, host, port)
    while 1:
        line = f.readline()
        if not line:
            print '(Unexpected EOF from server)'
            break
        if line[-2:] == CRLF:
            line = line[:-2]
        elif line[-1:] in CRLF:
            line = line[:-1]
        if line == '.':
            break
        if line[:2] == '..':
            line = line[1:]
        func(line)
    f.close()

# Get a binary file as one solid data block
def get_binary(selector, host, port):
    f = send_request(selector, host, port)
    data = f.read()
    f.close()
    return data

# Get a binary file and pass each block to a function
def get_alt_binary(selector, host, port, func, blocksize):
    f = send_request(selector, host, port)
    while 1:
        data = f.read(blocksize)
        if not data:
            break
        func(data)

# A *very* simple interactive browser

# Browser main command, has default arguments
def browser(*args):
    selector = DEF_SELECTOR
    host = DEF_HOST
    port = DEF_PORT
    n = len(args)
    if n > 0 and args[0]:
        selector = args[0]
    if n > 1 and args[1]:
        host = args[1]
    if n > 2 and args[2]:
        port = args[2]
    if n > 3:
        raise RuntimeError, 'too many args'
    try:
        browse_menu(selector, host, port)
    except socket.error, msg:
        print 'Socket error:', msg
        sys.exit(1)
    except KeyboardInterrupt:
        print '\n[Goodbye]'

# Browse a menu
def browse_menu(selector, host, port):
    list = get_menu(selector, host, port)
    while 1:
        print '----- MENU -----'
        print 'Selector:', repr(selector)
        print 'Host:', host, ' Port:', port
        print
        for i in range(len(list)):
            item = list[i]
            typechar, description = item[0], item[1]
            print string.rjust(repr(i+1), 3) + ':', description,
            if typename.has_key(typechar):
                print typename[typechar]
            else:
                print '<TYPE=' + repr(typechar) + '>'
        print
        while 1:
            try:
                str = raw_input('Choice [CR == up a level]: ')
            except EOFError:
                print
                return
            if not str:
                return
            try:
                choice = string.atoi(str)
            except string.atoi_error:
                print 'Choice must be a number; try again:'
                continue
            if not 0 < choice <= len(list):
                print 'Choice out of range; try again:'
                continue
            break
        item = list[choice-1]
        typechar = item[0]
        [i_selector, i_host, i_port] = item[2:5]
        if typebrowser.has_key(typechar):
            browserfunc = typebrowser[typechar]
            try:
                browserfunc(i_selector, i_host, i_port)
            except (IOError, socket.error):
                print '***', sys.exc_type, ':', sys.exc_value
        else:
            print 'Unsupported object type'

# Browse a text file
def browse_textfile(selector, host, port):
    x = None
    try:
        p = os.popen('${PAGER-more}', 'w')
        x = SaveLines(p)
        get_alt_textfile(selector, host, port, x.writeln)
    except IOError, msg:
        print 'IOError:', msg
    if x:
        x.close()
    f = open_savefile()
    if not f:
        return
    x = SaveLines(f)
    try:
        get_alt_textfile(selector, host, port, x.writeln)
        print 'Done.'
    except IOError, msg:
        print 'IOError:', msg
    x.close()

# Browse a search index
def browse_search(selector, host, port):
    while 1:
        print '----- SEARCH -----'
        print 'Selector:', repr(selector)
        print 'Host:', host, ' Port:', port
        print
        try:
            query = raw_input('Query [CR == up a level]: ')
        except EOFError:
            print
            break
        query = string.strip(query)
        if not query:
            break
        if '\t' in query:
            print 'Sorry, queries cannot contain tabs'
            continue
        browse_menu(selector + TAB + query, host, port)

# "Browse" telnet-based information, i.e. open a telnet session
def browse_telnet(selector, host, port):
    if selector:
        print 'Log in as', repr(selector)
    if type(port) <> type(''):
        port = repr(port)
    sts = os.system('set -x; exec telnet ' + host + ' ' + port)
    if sts:
        print 'Exit status:', sts

# "Browse" a binary file, i.e. save it to a file
def browse_binary(selector, host, port):
    f = open_savefile()
    if not f:
        return
    x = SaveWithProgress(f)
    get_alt_binary(selector, host, port, x.write, 8*1024)
    x.close()

# "Browse" a sound file, i.e. play it or save it
def browse_sound(selector, host, port):
    browse_binary(selector, host, port)

# Dictionary mapping types to browser functions
typebrowser = {'0': browse_textfile, '1': browse_menu, \
        '4': browse_binary, '5': browse_binary, '6': browse_textfile, \
        '7': browse_search, \
        '8': browse_telnet, '9': browse_binary, 's': browse_sound}

# Class used to save lines, appending a newline to each line
class SaveLines:
    def __init__(self, f):
        self.f = f
    def writeln(self, line):
        self.f.write(line + '\n')
    def close(self):
        sts = self.f.close()
        if sts:
            print 'Exit status:', sts

# Class used to save data while showing progress
class SaveWithProgress:
    def __init__(self, f):
        self.f = f
    def write(self, data):
        sys.stdout.write('#')
        sys.stdout.flush()
        self.f.write(data)
    def close(self):
        print
        sts = self.f.close()
        if sts:
            print 'Exit status:', sts

# Ask for and open a save file, or return None if not to save
def open_savefile():
    try:
        savefile = raw_input( \
    'Save as file [CR == don\'t save; |pipeline or ~user/... OK]: ')
    except EOFError:
        print
        return None
    savefile = string.strip(savefile)
    if not savefile:
        return None
    if savefile[0] == '|':
        cmd = string.strip(savefile[1:])
        try:
            p = os.popen(cmd, 'w')
        except IOError, msg:
            print repr(cmd), ':', msg
            return None
        print 'Piping through', repr(cmd), '...'
        return p
    if savefile[0] == '~':
        savefile = os.path.expanduser(savefile)
    try:
        f = open(savefile, 'w')
    except IOError, msg:
        print repr(savefile), ':', msg
        return None
    print 'Saving to', repr(savefile), '...'
    return f

# Test program
def test():
    if sys.argv[4:]:
        print 'usage: gopher [ [selector] host [port] ]'
        sys.exit(2)
    elif sys.argv[3:]:
        browser(sys.argv[1], sys.argv[2], sys.argv[3])
    elif sys.argv[2:]:
        try:
            port = string.atoi(sys.argv[2])
            selector = ''
            host = sys.argv[1]
        except string.atoi_error:
            selector = sys.argv[1]
            host = sys.argv[2]
            port = ''
        browser(selector, host, port)
    elif sys.argv[1:]:
        browser('', sys.argv[1])
    else:
        browser()

# Call the test program as a main program
test()

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