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Webware-Main.py
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Webware-Main.py
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#!/usr/bin/env python
# -*- coding: iso-8859-1 -*-
# This file is meant to be used with Webware (http://webware.sf.net/).
# Part of Web of trust statistics and pathfinder, Wotsap
# Copyright (C) 2003 Jörgen Cederlöf <[email protected]>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
dumpfile = "/home/jc/wots/latest.wot"
url = "http://webware.lysator.liu.se/jc/"
minsize = 200,50
maxsize = 2000,2000
defaultsize = 980,700
maxwanted = 1000
from WebKit.Page import Page
import sys
import os
import wotsap
import re
import time
# _foo=[bar] arguments is an idiom for static variables.
# An argument gets its default value only once, so if it is mutable it
# can be changed. The underscore is there to remind the caller that
# the variable is internal.
# TODO This should be called once in a while by some sort of timer, to
# avoid long load times for the first request. Is that possible with
# Webware?
def getlatestwot(path=dumpfile, _lastmtime=[0], _wot=[None]):
if os.lstat(path).st_mtime != _lastmtime[0]:
_lastmtime[0] = os.lstat(path).st_mtime
wot = wotsap.Wot(path, obfuscateemail=True)
wot.initfont()
_wot[0] = wot
return _wot[0]
def handlelegacyurl(wot, fields, redirect):
"""Handle the early, now obsolete, URL scheme."""
def fieldtokey(field, regexp="^0x[0-9a-fA-F]{8}$"):
if field in fields and re.compile(regexp).search(fields[field]):
return fields[field]
bottom, top = fieldtokey('bottom'), fieldtokey('top')
if bottom and top:
size = fieldtokey('size', '^[0-9]+x[0-9]+$')
if size: args = "?size=" + size
else: args = ""
redirect(url+"wotsap/wots/latest/paths/%s-%s.png%s"%(bottom,top,args))
elif top:
redirect(url+"wotsap/wots/latest/keystatistics/%s.txt"%top)
else:
redirect("http://www.lysator.liu.se/~jc/wotsap/")
def handleurl(urlpath, fields, write, setheader, redirect, urlencode):
"""Parse URL and take appropriate action."""
wot = getlatestwot()
# Arguments
def checkfields(allowedfields, mandatoryfields=()):
ret = ""
for field in fields:
if field not in mandatoryfields:
if field not in allowedfields:
raise ValueError('Unknown field "%s".' % field)
if fields[field]:
if not ret: ret += '?'
else: ret += '&'
ret += '%s=%s' % (urlencode(field),
urlencode(fields[field]))
for field in mandatoryfields:
if field not in fields or not fields[field]:
raise ValueError('Mandatory field "%s" not specified.' % field)
return ret
modstring = fields.get('modstring', None)
if 'size' in fields and fields['size']:
try:
size = fields['size'].split('x', 1)
size = int(size[0]), int(size[1])
if not minsize[0] <= size[0] <= maxsize[0] or \
not minsize[1] <= size[1] <= maxsize[1]:
raise ValueError(
'Size too large or too small: %s\n'%fields['size'] +\
'It must be between %dx%d and %dx%d, inclusive.\n' % (minsize+maxsize))
except IndexError, err:
raise ValueError('Error in size "%s". Size must be in format ' \
'"1024x768".' % fields['size'])
else:
size = defaultsize
if 'date' in fields and fields['date']:
raise NotImplementedError('Error: date not implemented yet.')
# Parse URLpath
kre = "0x[0-9a-fA-F]{8}"
def matches(regexp):
return re.compile(regexp).search(urlpath)
# Remove double slashes
tmp = -1
while tmp != len(urlpath):
tmp = len(urlpath)
urlpath = urlpath.replace('//', '/')
del tmp
if urlpath[0:1] == "/":
urlpath = urlpath[1:]
# Empty URLpath?
if matches("^/*$"):
redirect("http://www.lysator.liu.se/~jc/")
return
# Legacy URLpath?
elif matches("^wotsap/$"):
if not fields: # We dont support statistics this way anymore.
redirect("http://www.lysator.liu.se/~jc/wotsap/")
else:
return handlelegacyurl(wot, fields, redirect)
# Action.
elif matches('^wotsap/wots/latest/wotinfo.txt$'):
checkfields([])
setheader('Content-type', 'text/plain; charset=utf-8' )
write(wot.wotstats().encode('utf-8', 'replace'))
elif matches('^wotsap/wots/latest/debuginfo.txt$'):
checkfields([])
setheader('Content-type', 'text/plain; charset=utf-8' )
write(wot.debug.encode('utf-8', 'replace'))
elif matches('^wotsap/wots/latest/keystatistics/%s\\.txt$'%kre):
args = checkfields(['modstring', 'wanted', 'restrict'])
wanted = fields.get('wanted', 0)
restrict = fields.get('restrict', None)
if wanted:
wanted = int(wanted)
if wanted > maxwanted:
raise ValueError(
'Too large wanted value %d. It must be no larger than %d.'\
% (wanted, maxwanted))
key = urlpath[-14:-4]
timer = {'time' : 8,
'fraction' : 0.10,
'action' : 'raise'}
try:
stats = wot.keystats(key, modstring=modstring, wanted=wanted,
restrict=restrict, timer=timer).encode('utf-8', 'replace')
except wotsap.wotTimeoutError, err:
setheader('Content-type', 'text/plain; charset=utf-8' )
err.times['appendstring'] = \
'\nSorry, this is to much. Try restricting to fewer keys or run the stand-alone program.\n'\
'Or look at http://keyserver.kjsl.com/~jharris/ka/current/top50table.html.\n'
raise ValueError(str(err))
setheader('Content-type', 'text/plain; charset=utf-8' )
write(stats)
elif matches('^wotsap/wots/latest/paths/%s-%s\\.png$'%(kre,kre)):
checkfields(['modstring', 'size'])
bottomkey = urlpath[-25:-15]
topkey = urlpath[-14: -4]
web = wot.findpaths(bottomkey, topkey, modstr=modstring)
graph = wot.creategraph(web, config={'size': size}, format="PIL")
setheader('Content-type', 'image/png')
tmpwrite = write
class tmpfile:
# PIL documentation says we need seek, tell, and write,
# but write seems to be sufficient.
write = tmpwrite
graph.save(tmpfile, 'png')
elif matches('^wotsap/wots/latest/groupmatrix/.*\\.txt$'):
checkfields(['modstring'])
keys = urlpath[31:-4]
setheader('Content-type', 'text/plain; charset=utf-8')
for line in wot.groupmatrix(keys, modstring=modstring):
write(line.encode('utf-8', 'replace') + '\n')
# Searches
# raise wot.wotKeyNotFoundError(str2key(path[14:24]))
elif matches('^wotsap/search/wotinfo$'):
checkfields([])
redirect(url+"wotsap/wots/latest/wotinfo.txt")
elif matches('^wotsap/search/debuginfo$'):
checkfields([])
redirect(url+"wotsap/wots/latest/debuginfo.txt")
elif matches('^wotsap/search/keystatistics$'):
args = checkfields(['modstring', 'wanted', 'restrict'], ['key'])
key = wot.nametokey(fields['key'])
redirect(url+"wotsap/wots/latest/keystatistics/%s.txt"%key +args)
elif matches('^wotsap/search/paths$'):
args = checkfields(['modstring', 'size'], ['bottom', 'top'])
bottom = wot.nametokey(fields['bottom'])
top = wot.nametokey(fields['top' ])
redirect(url+"wotsap/wots/latest/paths/%s-%s.png"%(bottom,top) +args)
elif matches('^wotsap/search/groupmatrix$'):
args = checkfields(['modstring'], ['keys'])
namelist = fields['keys'].split(',')
if len(namelist) > 1:
def nametokey(name):
try:
return wot.nametokey(name)
except wotsap.wotKeyNotFoundError:
return name
keys = ','.join([nametokey(name) for name in namelist])
redirect(url+"wotsap/wots/latest/groupmatrix/%s.txt"%keys +args)
else:
setheader('Content-type', 'text/plain; charset=utf-8')
for line in wot.groupmatrix(None, searchstring=namelist[0],
modstring=modstring):
write(line.encode('utf-8', 'replace') + '\n')
elif matches('^wotsap/search/listkeys$'):
args = checkfields([], ['keys'])
setheader('Content-type', 'text/plain; charset=utf-8')
for name in wot.listkeys(fields['keys']):
write(name.encode('utf-8', 'replace') + '\n')
else: # Unknown URLpath
redirect("http://www.lysator.liu.se/~jc/wotsap/")
#setheader('Content-type', 'text/plain; charset=utf-8')
#write("Unknown path: ")
#write(urlpath.encode('utf-8', 'replace') + '\n')
#write(str(fields) + '\n')
def errorwrapper(urlpath, fields, write, setheader, sendredirect, urlencode):
try:
return handleurl(urlpath, fields, write, setheader, sendredirect, urlencode)
except (ValueError, NotImplementedError, wotsap.wotTooManyError,
wotsap.wotKeyNotFoundError, wotsap.wotPathNotFoundError,
wotsap.wotModstringError), err:
setheader('Content-type', 'text/plain; charset=utf-8')
write(unicode(err).encode('utf-8', 'replace'))
# Every time someone requests a page, Webware calls Main.writeHTML.
# Webware is kind enough to give us both the whole URL between
# "http://webware.lysator.liu.se/jc/" and "?", and both GET and POST
# form entries nicely interpreted and put into a dictionary. All we
# have to do is parse these and take appropriate action.
class Main(Page):
def writeHTML(self):
request = self.request()
sendredirect = self.response().sendRedirect
setheader = self.response().setHeader
urlencode = self.urlEncode
fields = self.request().fields()
urlpath = self.request().originalURLPath()
write = self.write
# TODO: Try to log more. Full GET line? Complete raw headers?
print 'Recived request at %s from %r: %r %r' % (
time.strftime('%Y-%m-%d_%H:%M:%S'), request.remoteAddress(),
urlpath, fields)
# Useful when debugging:
#def sendredirect(url):
# setheader('Content-type', 'text/plain; charset=utf-8')
# write('Intercepted redirect to: %s' % url)
# The strings we get from Webware are just the 7bit URL
# decoded to 8bit octet streams. HTML4.01 says that that
# stream is latin1 encoded. In practice, things are very
# complicated. See e.g.
# http://ppewww.ph.gla.ac.uk/~flavell/charset/form-i18n.html
# . It seems to indicate that browsers often choose the same
# encoding as the web page the form is on. If we code the web
# page in iso-8859-1, both that rule and the HTML4.01 spec
# says that the string should be iso-8859-1. This will make it
# impossible to enter other characters. The only other simple
# alternative would be to have the web page coded in UTF-8 and
# treat all form data as UTF-8, but that would mean that
# standards-conforming browsers wouldn't be able to send
# non-ASCII iso-8859-1 characters. Tons of other heuristics
# exists if someone wants to make it more stable.
urlpath = urlpath.decode('iso-8859-1', 'replace')
for key in fields: # The field names themselves are ascii.
# If a field is supplied more than once, Webware gives us
# a list of strings instead of a string. We use the last
# one.
if type(fields[key]) is type([]):
fields[key] = fields[key][-1]
fields[key] = fields[key].decode('iso-8859-1', 'replace')
return errorwrapper(urlpath, fields, write, setheader, sendredirect, urlencode)