/usr/share/pyshared/Pyblosxom/crashhandling.py is in pyblosxom 1.5.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This file is part of Pyblosxom.
#
# Copyright (C) 2011 by the Pyblosxom team. See AUTHORS.
#
# Pyblosxom is distributed under the MIT license. See the file
# LICENSE for distribution details.
#######################################################################
"""
This module has the code for handling crashes.
.. Note::
This is a leaf node module! It should never import other Pyblosxom
modules or packages.
"""
import sys
import StringIO
import cgi
import traceback
_e = cgi.escape
class Response:
"""This is a minimal response that is returned by the crash
handler.
"""
def __init__(self, status, headers, body):
self.status = status
self.headers = headers
self.body = body
self.seek = body.seek
self.read = body.read
class CrashHandler:
def __init__(self, httpresponse=False, environ=None):
"""
:param httpresponse: boolean representing whether when
handling a crash, we do http response headers
"""
self.httpresponse = httpresponse
if environ:
self.environ = environ
else:
self.environ = {}
def __call__(self, exc_type, exc_value, exc_tb):
response = self.handle(exc_type, exc_value, exc_tb)
if self.httpresponse:
response.headers.append(
"Content-Length: %d" % httpresponse.body.len)
sys.output.write("HTTP/1.0 %s\n" % response.status)
for key, val in response.headers.items():
sys.output.write("%s: %s\n" % (key, val))
sys.output.write("\n")
sys.output.write(response.body.read())
sys.output.flush()
def handle_by_response(self, exc_type, exc_value, exc_tb):
"""Returns a basic response object holding crash information
for display.
"""
headers = {}
output = StringIO.StringIO()
headers["Content-Type"] = "text/html"
# FIXME - are there other userful headers?
output.write("<html>")
output.write("<title>HTTP 500: Oops!</title>")
output.write("<body>")
output.write("<h1>HTTP 500: Oops!</h1>")
output.write(
"<p>A problem has occurred while Pyblosxom was rendering "
"this page.</p>")
output.write(
"<p>If this is your blog and you've just upgraded Pyblosxom, "
"check the manual for changes you need to make to your "
"config.py, pyblosxom.cgi, blog.ini, plugins, and flavour "
"files. This is usually covered in the Upgrade and What's New "
"chapters.</p>\n"
"<p>If you need help, contact us on IRC or the pyblosxom-users "
"mailing list.</p>\n"
"<p>The manual and details on IRC and the pyblosxom-users "
"mailing list are all on the "
"<a href=\"http://pyblosxom.github.com/\">website</a>.</p>")
output.write("<p>Here is some useful information to track down "
"the root cause of the problem:</p>")
output.write("<div style=\"border: 1px solid black; padding: 10px;\">")
try:
import Pyblosxom
version = Pyblosxom.__version__
except:
version = "unknown"
output.write("<p>Pyblosxom version: %s</p>" % _e(version))
output.write("<p>Python version: %s" % _e(sys.version))
output.write("<p>Error traceback:</p>")
output.write("<pre>")
tb = "".join(traceback.format_exception(exc_type, exc_value, exc_tb))
output.write(_e(tb))
output.write("</pre>")
output.write("<p>HTTP environment:</p>")
output.write("<pre>")
for key, val in self.environ.items():
output.write("%s: %s\n" % (_e(repr(key)), _e(repr(val))))
output.write("</pre>")
output.write("</div>")
output.write("</body>")
output.write("</html>")
headers["Content-Length"] = str(output.len)
return Response("500 Server Error", headers, output)
def enable_excepthook(httpresponse=False):
"""This attaches the crashhandler to the sys.excepthook.
This will handle any exceptions thrown that don't get
handled anywhere else.
If you're running Pyblosxom as a WSGI application or as a CGI
script, you should create a ``CrashHandler`` instance and call
``handle_by_response`` directly. See
:ref:`pyblosxom.PyblosxomWSGIApp`.
"""
sys.excepthook = CrashHandler(httpresponse=httpresponse)
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