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gopher.py
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1996-03-12
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#! /usr/local/bin/python
# A *very* simple interactive gopher client
#
# Usage: gopher [ [selector] host [port] ]
import string
import sys
import os
import socket
from gopherlib import *
# 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_directory('*** TOPLEVEL ***', selector, host, port)
except socket.error, msg:
print 'Socket error:', msg
sys.exit(1)
except KeyboardInterrupt:
print '\n[Goodbye]'
# Browse a directory
def browse_directory(description, selector, host, port):
list = get_directory(send_selector(selector, host, port))
while 1:
print '----- MENU:', description, '-----'
print 'Selector:', `selector`
print 'Host:', host, ' Port:', port
print
for i in range(len(list)):
item = list[i]
gtype, descr = item[0], item[1]
print string.rjust(`i+1`, 3) + ':', descr, \
'<' + type_to_name(gtype) + '>'
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]
[gtype, i_descr, i_sel, i_host, i_port] = item[:5]
if typebrowser.has_key(gtype):
browserfunc = typebrowser[gtype]
else:
print 'Unsupported file type', `gtype`, '--> binary'
browserfunc = browse_binary
try:
browserfunc(i_descr, i_sel, i_host, i_port)
except (IOError, socket.error):
print '***', sys.exc_type, ':', sys.exc_value
# Browse a text file
def browse_textfile(description, selector, host, port):
print '----- TEXTFILE:', description, '-----'
print 'Selector:', `selector`
print 'Host:', host, ' Port:', port
print
cf = send_selector(selector, host, port)
x = None
try:
p = os.popen('${PAGER-more}', 'w')
x = SaveLines(p)
get_alt_textfile(cf, x.writeln)
except IOError, msg:
print 'IOError:', msg
if x:
x.close()
f = open_savefile()
if not f:
return
cf = send_selector(selector, host, port)
x = SaveLines(f)
try:
get_alt_textfile(cf, x.writeln)
print 'Done.'
except IOError, msg:
print 'IOError:', msg
x.close()
# Browse a search index
def browse_index(description, selector, host, port):
while 1:
print '----- SEARCH:', description, '-----'
print 'Selector:', `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_directory('Search outcome', \
selector + TAB + query, host, port)
# "Browse" telnet-based information, i.e. open a telnet session
def browse_telnet(description, selector, host, port):
cmd = 'telnet'
if selector:
cmd = cmd + ' -l ' + selector
cmd = cmd + ' ' + host
if port:
cmd = cmd + ' ' + port
print '----- EXEC:', cmd, '-----'
sts = os.system(cmd)
if sts:
print 'Exit status:', sts
# "Browse" a binary file, i.e. save it to a file
def browse_binary(description, selector, host, port):
print '----- BINARY:', description, '-----'
print 'Selector:', `selector`
print 'Host:', host, ' Port:', port
print
f = open_savefile()
if not f:
return
cf = send_selector(selector, host, port)
x = SaveWithProgress(f)
get_alt_binary(cf, x.write, 8*1024)
x.close()
# "Browse" a sound file, i.e. play it or save it
def browse_sound(description, selector, host, port):
print '----- SOUND:', description, '-----'
print 'Selector:', `selector`
print 'Host:', host, ' Port:', port
print
f = open_savefile() # Use |playulaw, for instance
if not f:
return
cf = send_selector(selector, host, port)
x = SaveWithProgress(f)
get_alt_binary(cf, x.write, 8000) # Exactly 8000 bytes/sec!
x.close()
# Deny browsing an entry
def browse_not(description, selector, host, port):
print '----- DENIED:', description, '-----'
print 'It would be unwise to connect to host', host, 'and port', port
print 'since the type of connection does not yield a file.'
# Dictionary mapping types to browser functions
typebrowser = { \
A_FILE: browse_textfile, \
A_DIRECTORY: browse_directory, \
A_INDEX: browse_index, \
A_TELNET: browse_telnet, \
A_UNIXBIN: browse_binary, \
A_SOUND: browse_sound, \
A_TN3270: browse_not, \
'Z': browse_directory, \
}
# 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 `cmd`, ':', msg
return None
print 'Piping through', `cmd`, '...'
return p
if savefile[0] == '~':
savefile = os.path.expanduser(savefile)
try:
f = open(savefile, 'w')
except IOError, msg:
print `savefile`, ':', msg
return None
print 'Saving to', `savefile`, '...'
return f
# Main program
def main():
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
main()