/usr/lib/python2.7/dist-packages/linkcheck/lc_cgi.py is in linkchecker 9.3-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 | # -*- coding: iso-8859-1 -*-
# Copyright (C) 2000-2014 Bastian Kleineidam
#
# 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.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""
Functions used by the WSGI script.
"""
import cgi
import os
import threading
import locale
import re
import time
import urlparse
from . import configuration, strformat, checker, director, get_link_pat, \
init_i18n, url as urlutil
from .decorators import synchronized
# 5 minutes timeout for requests
MAX_REQUEST_SECONDS = 300
# character set encoding for HTML output
HTML_ENCODING = 'utf-8'
def application(environ, start_response):
"""WSGI interface: start an URL check."""
# the environment variable CONTENT_LENGTH may be empty or missing
try:
request_body_size = int(environ.get('CONTENT_LENGTH', 0))
except ValueError:
request_body_size = 0
# When the method is POST the query string will be sent
# in the HTTP request body which is passed by the WSGI server
# in the file like wsgi.input environment variable.
if request_body_size > 0:
request_body = environ['wsgi.input'].read(request_body_size)
else:
request_body = environ['wsgi.input'].read()
form = cgi.parse_qs(request_body)
status = '200 OK'
start_response(status, get_response_headers())
for output in checklink(form=form, env=environ):
yield output
_supported_langs = ('de', 'C')
# map language -> locale name
lang_locale = {
'de': 'de_DE',
'C': 'C',
'en': 'en_EN',
}
_is_level = re.compile(r'^(0|1|2|3|-1)$').match
class LCFormError (StandardError):
"""Form related errors."""
pass
def get_response_headers():
"""Get list of response headers in key-value form."""
return [("Content-type", "text/html"),
("Cache-Control", "no-cache"),
("Pragma:", "no-cache")
]
def formvalue (form, key):
"""Get value with given key from WSGI form."""
field = form.get(key)
if isinstance(field, list):
field = field[0]
return field
_lock = threading.Lock()
class ThreadsafeIO (object):
"""Thread-safe unicode I/O class."""
def __init__(self):
"""Initialize buffer."""
self.buf = []
self.closed = False
@synchronized(_lock)
def write (self, data):
"""Write given unicode data to buffer."""
assert isinstance(data, unicode)
if self.closed:
raise IOError("Write on closed I/O object")
if data:
self.buf.append(data)
@synchronized(_lock)
def get_data (self):
"""Get bufferd unicode data."""
data = u"".join(self.buf)
self.buf = []
return data
@synchronized(_lock)
def close (self):
"""Reset buffer and close this I/O object."""
self.buf = []
self.closed = True
def encode(s):
"""Encode given string in HTML encoding."""
return s.encode(HTML_ENCODING, 'ignore')
def checklink (form=None, env=os.environ):
"""Validates the CGI form and checks the given links."""
if form is None:
form = {}
try:
checkform(form, env)
except LCFormError as errmsg:
log(env, errmsg)
yield encode(format_error(errmsg))
return
out = ThreadsafeIO()
config = get_configuration(form, out)
url = strformat.stripurl(formvalue(form, "url"))
aggregate = director.get_aggregate(config)
url_data = checker.get_url_from(url, 0, aggregate, extern=(0, 0))
aggregate.urlqueue.put(url_data)
for html_str in start_check(aggregate, out):
yield encode(html_str)
out.close()
def start_check (aggregate, out):
"""Start checking in background and write encoded output to out."""
# check in background
t = threading.Thread(target=director.check_urls, args=(aggregate,))
t.start()
# time to wait for new data
sleep_seconds = 2
# current running time
run_seconds = 0
while not aggregate.is_finished():
yield out.get_data()
time.sleep(sleep_seconds)
run_seconds += sleep_seconds
if run_seconds > MAX_REQUEST_SECONDS:
director.abort(aggregate)
break
yield out.get_data()
def get_configuration(form, out):
"""Initialize a CGI configuration."""
config = configuration.Configuration()
config["recursionlevel"] = int(formvalue(form, "level"))
config["logger"] = config.logger_new('html', fd=out, encoding=HTML_ENCODING)
config["threads"] = 2
if "anchors" in form:
config["enabledplugins"].append("AnchorCheck")
if "errors" not in form:
config["verbose"] = True
# avoid checking of local files or other nasty stuff
pat = "!^%s$" % urlutil.safe_url_pattern
config["externlinks"].append(get_link_pat(pat, strict=True))
config.sanitize()
return config
def get_host_name (form):
"""Return host name of given URL."""
return urlparse.urlparse(formvalue(form, "url"))[1]
def checkform (form, env):
"""Check form data. throw exception on error
Be sure to NOT print out any user-given data as HTML code, so use
only plain strings as exception text."""
# check lang support
if "language" in form:
lang = formvalue(form, 'language')
if lang in _supported_langs:
localestr = lang_locale[lang]
try:
# XXX this is not thread-safe, so think of something else
locale.setlocale(locale.LC_ALL, localestr)
init_i18n()
except locale.Error as errmsg:
log(env, "could not set locale %r: %s" % (localestr, errmsg))
else:
raise LCFormError(_("unsupported language %r") % lang)
# check url syntax
if "url" in form:
url = formvalue(form, "url")
if not url or url == "http://":
raise LCFormError(_("empty url was given"))
if not urlutil.is_safe_url(url):
raise LCFormError(_("disallowed url %r was given") % url)
else:
raise LCFormError(_("no url was given"))
# check recursion level
if "level" in form:
level = formvalue(form, "level")
if not _is_level(level):
raise LCFormError(_("invalid recursion level %r") % level)
# check options
for option in ("anchors", "errors", "intern"):
if option in form:
value = formvalue(form, option)
if value != "on":
raise LCFormError(_("invalid %s option %r") % (option, value))
def log (env, msg):
"""Log message to WSGI error output."""
logfile = env['wsgi.errors']
logfile.write(msg + "\n")
def dump (env, form):
"""Log environment and form."""
for var, value in env.items():
log(env, var+"="+value)
for key in form:
log(env, str(formvalue(form, key)))
def format_error (why):
"""Format standard error page.
@param why: error message
@ptype why: unicode
@return: HTML page content
@rtype: unicode
"""
return _("""<!DOCTYPE HTML>
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>LinkChecker Online Error</title></head>
<body text=#192c83 bgcolor=#fff7e5 link=#191c83 vlink=#191c83 alink=#191c83>
<blockquote>
<b>Error: %s</b><br/>
The LinkChecker Online script has encountered an error. Please ensure
that your provided URL link begins with <code>http://</code> and
contains only these characters: <code>A-Za-z0-9./_~-</code><br/><br/>
Errors are logged.
</blockquote>
</body>
</html>""") % cgi.escape(why)
|