20
20
'''Media file support for the framework.'''
28
27
from ivle.webapp.base.views import BaseView
29
from ivle.webapp.base.plugins import PublicViewPlugin, ViewPlugin, MediaPlugin
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'])}
28
from ivle.webapp.base.plugins import ViewPlugin
29
from ivle.webapp.errors import NotFound
39
31
def media_url(req, plugin, path):
40
32
'''Generates a URL to a media file.
42
34
Plugin can be a string, in which case it is put into the path literally,
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
35
or a plugin object, in which case its name is looked up.'''
36
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.
48
if not isinstance(plugin, basestring):
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
51
def __init__(self, req, ns, 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):
55
def _make_filename(self, req):
57
plugin = req.plugins[self.ns]
91
62
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):
63
except AttributeError:
66
plugindir = os.path.dirname(inspect.getmodule(plugin).__file__)
68
return os.path.join(plugindir, mediadir, self.path)
99
70
def render(self, req):
100
71
# If it begins with ".." or separator, it's illegal. Die.
101
if self.context.path.startswith("..") or \
102
self.context.path.startswith('/'):
72
if self.path.startswith("..") or self.path.startswith('/'):
105
filename = self.get_filename(req)
75
filename = self._make_filename(req)
109
77
# Find an appropriate MIME type.
110
78
(type, _) = mimetypes.guess_type(filename)
117
85
if not os.access(filename, os.R_OK) or os.path.isdir(filename):
120
if self.context.version is not None:
121
req.headers_out['Expires'] = email.utils.formatdate(
122
timeval=time.time() + (60*60*24*365),
127
88
req.content_type = type
128
89
req.sendfile(filename)
130
def get_filename(self, req):
131
return self.context.filename
133
def get_permissions(self, user, config):
136
def root_to_media(root, *segments):
137
if segments[0].startswith('+'):
138
if segments[0] == '+external':
143
version = segments[0][1:]
144
if segments[1] == '+external':
155
if version is not None and version != root.config['media']['version']:
159
path = os.path.normpath(os.path.join(*path[1:]))
161
return MediaFile(root, external, version, ns, path)
163
class Plugin(ViewPlugin, PublicViewPlugin):
164
forward_routes = [(ApplicationRoot, '+media', root_to_media, INF)]
165
views = [(MediaFile, '+index', MediaFileView)]
166
public_forward_routes = forward_routes
91
class Plugin(ViewPlugin):
93
('+media/:ns/*path', MediaFileView),