20
20
'''Media file support for the framework.'''
27
28
from ivle.webapp.base.views import BaseView
28
from ivle.webapp.base.plugins import ViewPlugin, MediaPlugin
29
from ivle.webapp.base.plugins import PublicViewPlugin, ViewPlugin, MediaPlugin
29
30
from ivle.webapp.errors import NotFound, Forbidden
31
from ivle.webapp.publisher import INF
32
from ivle.webapp import ApplicationRoot
34
# This maps a media namespace to an external dependency directory (in this
35
# case specified by the configuration option media/externals/jquery) and a
36
# list of permitted subpaths.
37
EXTERNAL_MEDIA_MAP = {'jquery': ('jquery', ['jquery.js'])}
31
39
def media_url(req, plugin, path):
32
40
'''Generates a URL to a media file.
34
42
Plugin can be a string, in which case it is put into the path literally,
35
or a plugin object, in which case its name is looked up.'''
43
or a plugin object, in which case its name is looked up.
45
If a version is specified in the IVLE configuration, a versioned URL will
36
48
if not isinstance(plugin, basestring):
37
plugin = req.reverse_plugins[plugin]
39
return os.path.join(ivle.conf.root_dir, '+media', plugin, path)
41
class MediaFileView(BaseView):
42
'''A view for media files.
44
This serves static files from directories registered by plugins.
46
Plugins wishing to export media should declare a 'media' attribute,
47
pointing to the directory to serve (relative to the module's directory).
48
The contents of that directory will then be available under
49
/+media/python.path.to.module.
51
def __init__(self, req, ns, path):
49
plugin = req.config.reverse_plugins[plugin]
51
media_path = os.path.join('+media', '+' + req.config['media']['version']) \
52
if req.config['media']['version'] else '+media'
54
return req.make_path(os.path.join(media_path, plugin, path))
56
class MediaFile(object):
57
def __init__(self, root, external, version, ns, path):
59
self.external = external
60
self.version = version
55
def _make_filename(self, req):
57
plugin = req.plugins[self.ns]
61
if not issubclass(plugin, MediaPlugin):
64
mediadir = plugin.media
65
plugindir = os.path.dirname(inspect.getmodule(plugin).__file__)
67
return os.path.join(plugindir, mediadir, self.path)
68
extern = EXTERNAL_MEDIA_MAP[self.ns]
72
# Unless it's a whitelisted path, we don't want to hear about it.
73
if self.path not in extern[1]:
76
# Grab the admin-configured path for this particular external dep.
77
externdir = self.root.config['media']['externals'][extern[0]]
79
assert isinstance(externdir, basestring)
81
return os.path.join(externdir, self.path)
84
plugin = self.root.config.plugins[self.ns]
88
if not issubclass(plugin, MediaPlugin):
91
mediadir = plugin.media
92
plugindir = os.path.dirname(inspect.getmodule(plugin).__file__)
94
return os.path.join(plugindir, mediadir, self.path)
96
class MediaFileView(BaseView):
97
def authorize(self, req):
69
100
def render(self, req):
70
101
# If it begins with ".." or separator, it's illegal. Die.
71
if self.path.startswith("..") or self.path.startswith('/'):
102
if self.context.path.startswith("..") or \
103
self.context.path.startswith('/'):
74
filename = self._make_filename(req)
106
filename = self.get_filename(req)
76
110
# Find an appropriate MIME type.
77
111
(type, _) = mimetypes.guess_type(filename)
84
118
if not os.access(filename, os.R_OK) or os.path.isdir(filename):
121
if self.context.version is not None:
122
req.headers_out['Expires'] = email.utils.formatdate(
123
timeval=time.time() + (60*60*24*365),
87
128
req.content_type = type
88
129
req.sendfile(filename)
90
class Plugin(ViewPlugin):
92
('+media/:ns/*path', MediaFileView),
131
def get_filename(self, req):
132
return self.context.filename
134
def root_to_media(root, *segments):
135
if segments[0].startswith('+'):
136
if segments[0] == '+external':
141
version = segments[0][1:]
142
if segments[1] == '+external':
153
if version is not None and version != root.config['media']['version']:
157
path = os.path.normpath(os.path.join(*path[1:]))
159
return MediaFile(root, external, version, ns, path)
161
class Plugin(ViewPlugin, PublicViewPlugin):
162
forward_routes = [(ApplicationRoot, '+media', root_to_media, INF)]
163
views = [(MediaFile, '+index', MediaFileView)]
164
public_forward_routes = forward_routes