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#!/usr/bin/python
# IVLE - Informatics Virtual Learning Environment
# Copyright (C) 2007-2008 The University of Melbourne
#
# 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 St, Fifth Floor, Boston, MA 02110-1301 USA
# Script: interpretservice
# Author: David Coles
# Date: 6/3/2007
# A CGI script for interpreting files.
import mimetypes
import os
import sys
import StringIO
import urlparse
import subprocess
from common import (cgirequest, studpath)
import conf
import conf.mimetypes, conf.app, conf.app.server
serveservice_path = "/opt/ivle/scripts/serveservice"
req = cgirequest.CGIRequest()
req.install_error_handler()
# Work out the parts of the URL
url = urlparse.urlparse(req.path)
querystr = url[4]
urlpath = url[2]
username, _, filename = studpath.url_to_jailpaths(urlpath)
path = os.path.split(filename)[0]
python = "/usr/bin/python"
# Everything should be done from the same directory as the script
# If we can't chdir, a 404 will be thrown later when we can't access the file.
try:
os.chdir(path)
except OSError:
pass
# Search the path for modules first
sys.path[0] = path
(type, _) = mimetypes.guess_type(filename)
if type is None:
type = conf.mimetypes.default_mimetype
if filename is None:
req.throw_error(req.HTTP_NOT_FOUND, "The path specified is invalid.")
elif not os.access(filename, os.R_OK):
req.throw_error(req.HTTP_NOT_FOUND,
"The specified file (%s) does not exist." % urlpath)
elif os.path.isdir(filename):
# 403 Forbidden error for visiting a directory
# (Not giving a directory listing, since this can be seen by
# the world at large. Directory contents are private).
req.throw_error(req.HTTP_FORBIDDEN,
"The path specified is a directory.")
elif type in conf.app.server.interpreters:
# We'll save on a fork and execute in this python process
# Let exceptions blow up normally again
sys.excepthook = sys.__excepthook__
execfile(filename, {})
# Non-Python process should probably use something like
# subprocess.call([python, filename])
else:
# Otherwise, use the blacklist/whitelist to see if this file should be
# served or disallowed
if (conf.app.server.blacklist_served_filetypes and \
type in conf.app.server.served_filetypes_blacklist) or \
(conf.app.server.served_filetypes_whitelist and \
type not in conf.app.server.served_filetypes_whitelist):
req.throw_error(req.HTTP_FORBIDDEN,
"Files of this type are not allowed to be served.")
execfile(serveservice_path)
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