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# IVLE - Informatics Virtual Learning Environment
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# Copyright (C) 2007-2008 The University of Melbourne
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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# Module: common.studpath
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# Provides functions for translating URLs into physical locations in the
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# student directories in the local file system.
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from common import util
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def url_to_local(urlpath):
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"""Given a URL path (part of a URL query string, see below), returns a
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* the username of the student whose directory is being browsed
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* the absolute path in the file system where that file will be
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found within the student directories.
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urlpath: Part of the URL, but only the part *after* the application. For
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instance, given the URL "/ivle/browse/joe/home/mydir/myfile", urlpath will
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be just "joe/home/mydir/myfile". The expected result is something like
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("joe", "/home/informatics/jails/joe/home/joe/home/mydir/myfile").
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Note that the actual location is not guaranteed by this interface (this
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function serves as a single point of control as to how URLs map onto
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Returns (None, None) if the path is empty.
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See also: conf.jail_base
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# First normalise the path
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urlpath = os.path.normpath(urlpath)
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# Now if it begins with ".." or separator, then it's illegal
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if urlpath.startswith("..") or urlpath.startswith(os.sep):
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# Note: User can be a group name. There is absolutely no difference in our
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# current directory scheme.
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(user, subpath) = util.split_path(urlpath)
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if user is None: return (None, None)
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# Join the user onto 'home' then the full path specified.
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# This results in the user's name being repeated twice, which is in
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# accordance with our directory scheme.
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# (The first time is the name of the jail, the second is the user's home
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# directory within the jail).
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path = os.path.join(conf.jail_base, user, 'home', urlpath)
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def url_to_jailpaths(urlpath):
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"""Given a URL path (part of a URL query string), returns a tuple of
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* the username of the student whose directory is being browsed
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* the absolute path where the jail will be located.
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* the path of the file relative to the jail.
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urlpath: See urlpath in url_to_local.
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>>> url_to_jailpaths("joe/home/mydir/myfile")
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("joe", "/home/informatics/jails/joe", "home/joe/home/mydir/myfile")
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>>> url_to_jailpaths("")
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# First normalise the path
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urlpath = os.path.normpath(urlpath)
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# Now if it begins with ".." then it's illegal
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if urlpath.startswith(".."):
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return (None, None, None)
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# Note: User can be a group name. There is absolutely no difference in our
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# current directory scheme.
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(user, subpath) = util.split_path(urlpath)
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if user is None: return (None, None, None)
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jail = os.path.join(conf.jail_base, user)
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path = os.path.join('home', urlpath)
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return (user, jail, path)
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www/common/studpath.py
