mirror of
https://github.com/Hopiu/linkchecker.git
synced 2026-03-17 06:20:27 +00:00
280 lines
8 KiB
Python
280 lines
8 KiB
Python
# 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 html
|
|
import threading
|
|
import locale
|
|
import re
|
|
import time
|
|
import urllib.parse
|
|
|
|
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 = urllib.parse.parse_qs(request_body.decode(HTML_ENCODING))
|
|
|
|
status = '200 OK'
|
|
start_response(status, get_response_headers())
|
|
yield from checklink(form=form, env=environ)
|
|
|
|
|
|
_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(Exception):
|
|
"""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:
|
|
"""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, str)
|
|
if self.closed:
|
|
raise OSError("Write on closed I/O object")
|
|
if data:
|
|
self.buf.append(data)
|
|
|
|
@synchronized(_lock)
|
|
def get_data(self):
|
|
"""Get bufferd unicode data."""
|
|
data = "".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, env):
|
|
"""Validates the CGI form and checks the given links."""
|
|
if form is None:
|
|
form = {}
|
|
try:
|
|
checkform(form, env)
|
|
except LCFormError as err:
|
|
log(env, err)
|
|
yield encode(format_error(str(err)))
|
|
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["status"] = False
|
|
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 urllib.parse.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("%s\n" % msg)
|
|
|
|
|
|
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
|
|
@type 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>"""
|
|
)
|
|
% html.escape(why)
|
|
)
|