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

#!/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

# Author: Thomas Conway, Will Grant

import mimetypes

import os

import sys

import StringIO

from optparse import OptionParser

import cjson

from ivle import zip as zipmod

import ivle.conf.app.server

def determine_file_type(filename):

    filetype = mimetypes.guess_type(filename)[0]

    if filetype is None:

         filetype = ivle.conf.mimetypes.default_mimetype

    return filetype

def throw_error(message, extra={}):

    error = {'error': message}

    error.update(extra)

    print cjson.encode(error)

    sys.exit(0)

parser = OptionParser()

parser.add_option('-d', '--download', dest='download', action='store_true',

                  help='force download, not execution, of the paths')

(options, args) = parser.parse_args()

# Detect download mode. Download mode zips any multiple selection,

# and does not execute CGI scripts.

if options.download:

    download = True

    # paths is filled later.

else:

    download = False

    assert len(args) == 1

default_mimetype = "application/octet-stream"

zip_mimetype = "application/zip"

zipmode = False

zipbasepath = None

zipfilename = None

# If multiple paths have been specified, zip them up.

if len(args) > 1:

    # Mangle the paths - we want the basename of their dirname in front.

    paths = []

    dir = os.path.dirname(args[0])

    for path in args:

        assert os.path.dirname(path) == dir

        paths.append(os.path.join(os.path.basename(dir),

                                  os.path.basename(path)))

    dir = os.path.dirname(dir)

    zipmode = True

    zipbasepath = dir

    zipfilename = os.path.basename(zipbasepath)

else:

    paths = args

    filename = paths[0]

    if not os.access(filename, os.F_OK):

        # The given path doesn't exist. CGI lets us backtrack and put the path

        # elements through which we pass into PATH_INFO, so we try that.

        while not os.access(filename, os.F_OK):

            filename, path_info_frag = os.path.split(filename)

        # We now have a file that exists, but is it something that we're allowed

        # to execute? If not, we should 404 anyway.

        if determine_file_type(filename) not in ivle.conf.app.server.interpreters:

            throw_error('not-found')

    # If it's a directory, serve as a zip file

    if os.path.isdir(filename):

        if not download:

            # Not giving a directory listing - this is visible to everyone.

            throw_error('is-directory')

        zipmode = True

        # Zip it from the perspective of its own parent.

        # That way it will be a directory in the top level of the zip

        # file.

        if filename[-1] == os.sep: filename = filename[:-1]

        splitpath = filename.rsplit(os.sep, 1)

        if len(splitpath) == 1:

            zipbasepath = ''

            paths = [filename]

        else:

            zipbasepath = splitpath[0]

            paths = [splitpath[1]]

        zipfilename = filename

    else:

        if not download and \

           determine_file_type(filename) in ivle.conf.app.server.interpreters:

            throw_error('is-executable', {'path': filename})

        if not download and (

            (ivle.conf.app.server.blacklist_served_filetypes and \

                determine_file_type(filename) in \

                ivle.conf.app.server.served_filetypes_blacklist) or \

            (ivle.conf.app.server.served_filetypes_whitelist and \

                determine_file_type(filename) not in \

                ivle.conf.app.server.served_filetypes_whitelist)):

            throw_error('forbidden')

if zipmode:

    # zipfilename is some filename. Strip trailing slash or extension,

    # and add ".zip".

    if zipfilename == '':

        zipfilename = "files"

    elif zipfilename[-1] == '/':

        zipfilename = zipfilename[:-1]

    elif '.' in zipfilename:

        zipfilename = zipfilename[:zipfilename.rindex('.')]

    zipfilename += ".zip"

    #req.headers_out["Content-Disposition"] = ("attachment; filename=" +   

    #    zipfilename) # TODO

    zipfile = StringIO.StringIO()

    zipmod.make_zip(zipbasepath, paths, zipfile)

    print cjson.encode({'type': zip_mimetype,

                        'name': zipfilename})

    stream = zipfile

    stream.seek(0)

else:

    print cjson.encode({'type': determine_file_type(filename),

                        'name': os.path.basename(filename)})

    stream = open(filename)

next = stream.read(1024)

while next:

    sys.stdout.write(next)

    next = stream.read(1024)