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by mattgiuca
New directory hierarchy. |
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# IVLE
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# Copyright (C) 2007-2008 The University of Melbourne
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#
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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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#
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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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#
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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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# App: server
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# Author: Tom Conway, Matt Giuca
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# Date: 13/12/2007
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# Serves content to the user (acting as a web server for students files).
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# For most file types we just serve the static file, but
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# for python files, we evaluate the python script inside
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# our safe execution environment.
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from common import (util, studpath, interpret) |
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import conf |
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import conf.app.server |
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import mimetypes |
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def handle(req): |
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"""Handler for the Server application which serves pages."""
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req.write_html_head_foot = False |
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# Get the username of the student whose work we are browsing, and the path
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# on the local machine where the file is stored.
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(user, path) = studpath.url_to_local(req.path) |
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if user is None: |
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# TODO: Nicer 404 message?
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req.throw_error(req.HTTP_NOT_FOUND) |
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serve_file(req, user, path) |
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def serve_file(req, owner, filename): |
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"""Serves a file, using one of three possibilities: interpreting the file,
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serving it directly, or denying it and returning a 403 Forbidden error.
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No return value. Writes to req (possibly throwing a server error exception
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using req.throw_error).
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req: An IVLE request object.
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owner: Username of the user who owns the file being served.
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filename: Filename in the local file system.
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"""
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# First get the mime type of this file
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# (Note that importing common.util has already initialised mime types)
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(type, _) = mimetypes.guess_type(filename) |
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if type is None: |
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type = conf.app.server.default_mimetype |
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# If this type is to be interpreted
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if type in conf.app.server.interpreters: |
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interp_name = conf.app.server.interpreters[type] |
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try: |
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# Get the interpreter function object
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interp_object = interpret.interpreter_objects[interp_name] |
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except KeyError: |
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# TODO: Nicer 500 message (this is due to bad configuration in
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# conf/app/server.py)
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req.throw_error(req.HTTP_INTERNAL_SERVER_ERROR) |
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interpret.interpret_file(req, owner, filename, interp_object) |
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else: |
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# Otherwise, use the blacklist/whitelist to see if this file should be
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# served or disallowed
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if conf.app.server.blacklist_served_filetypes: |
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toserve = type not in conf.app.server.served_filetypes_blacklist |
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else: |
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toserve = type in conf.app.server.served_filetypes_whitelist |
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# toserve or not toserve
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if not toserve: |
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# TODO: Nicer 403 message
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req.throw_error(req.HTTP_FORBIDDEN) |
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else: |
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serve_file_direct(req, filename, type) |
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def serve_file_direct(req, filename, type): |
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"""Serves a file by directly writing it out to the response.
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req: An IVLE request object.
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filename: Filename in the local file system.
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type: String. Mime type to serve the file with.
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"""
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if not os.access(filename, os.R_OK): |
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req.throw_error(req.HTTP_NOT_FOUND) |
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req.content_type = type |
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req.sendfile(filename) |