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# 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
# Module: common.studpath
# Author: Matt Giuca
# Date: 14/12/2007
# Provides functions for translating URLs into physical locations in the
# student directories in the local file system.
import os
import conf
from common import util
def url_to_local(urlpath):
"""Given a URL path (part of a URL query string, see below), returns a
tuple of
* the username of the student whose directory is being browsed
* the absolute path in the file system where that file will be
found within the student directories.
urlpath: Part of the URL, but only the part *after* the application. For
instance, given the URL "/ivle/browse/joe/home/mydir/myfile", urlpath will
be just "joe/home/mydir/myfile". The expected result is something like
("joe", "/home/informatics/jails/joe/home/joe/home/mydir/myfile").
Note that the actual location is not guaranteed by this interface (this
function serves as a single point of control as to how URLs map onto
student directories).
Returns (None, None) if the path is empty.
See also: conf.student_dir
"""
# Note: User can be a group name. There is absolutely no difference in our
# current directory scheme.
(user, subpath) = util.split_path(urlpath)
if user is None: return (None, None)
# Join the user onto 'home' then the full path specified.
# This results in the user's name being repeated twice, which is in
# accordance with our directory scheme.
# (The first time is the name of the jail, the second is the user's home
# directory within the jail).
path = os.path.join(conf.student_dir, user, 'home', urlpath)
return (user, path)
def url_to_jailpaths(urlpath):
"""Given a URL path (part of a URL query string), returns a tuple of
* the username of the student whose directory is being browsed
* the absolute path where the jail will be located.
* the path of the file relative to the jail.
urlpath: See urlpath in url_to_local.
>>> url_to_jailpaths("joe/home/mydir/myfile")
("joe", "/home/informatics/jails/joe", "home/joe/home/mydir/myfile")
>>> url_to_jailpaths("")
(None, None, None)
"""
# Note: User can be a group name. There is absolutely no difference in our
# current directory scheme.
(user, subpath) = util.split_path(urlpath)
if user is None: return (None, None, None)
jail = os.path.join(conf.student_dir, user)
path = os.path.join('home', urlpath)
return (user, jail, path)
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