~azzar1/unity/add-show-desktop-key

# IVLE

# 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

# App: File Service (AJAX server)

# Author: Matt Giuca

# Date: 9/1/2008

# This application is a wrapper around the library module fileservice.

# It can be configured to either call the library directly (in which case it

# behaves just like a regular application), or run it through the trampoline

# as a CGI app.

# It receives file handling instructions as requests. Performs actions on the

# student's workspace, and returns directory listings in JSON.

# See the documentation in lib/fileservice for details.

import os.path

import conf

import fileservice_lib

import common

import common.interpret

import common.util

# handle_with_trampoline controls the way in which fileservice_lib is invoked.

# If False, it will simply be called directly by this handler.

# If True, the request will get marshalled into a CGI environment and the

# trampoline will invoke services/fileservices within the user's jail

# (SetUID'd to them). This script will then wrap the CGI environment in a

# replica of the original environment and handle it that way.

# This is a lot of overhead but it's the only way to properly ensure we are

# acting "as" that user and therefore we don't run into permissions problems.

# If set to True, it will be a lot more efficient, but there will be

# permissions issues unless all user's files are owned by the web server user.

HANDLE_WITH_TRAMPOLINE = True

fileservice_path = "/opt/ivle/services/fileservice"   # Within jail

def handle(req):

    """Handler for the File Services application."""

    if len(req.path) == 0:

        # If no path specified, default to the user's home directory

        req.throw_redirect(common.util.make_path(os.path.join('fileservice',

                                                       req.user.login)))

    if not HANDLE_WITH_TRAMPOLINE:

        fileservice_lib.handle(req)

    else:

        interp_object = common.interpret.interpreter_objects["cgi-python"]

        user_jail_dir = os.path.join(conf.jail_base, req.user.login)

        common.interpret.interpret_file(req, req.user.login, user_jail_dir,

            fileservice_path, interp_object, gentle=False)