42
41
from ivle import util
44
43
from ivle.dispatch.request import Request
45
44
import ivle.webapp.security
46
45
from ivle.webapp.base.plugins import ViewPlugin, PublicViewPlugin
47
46
from ivle.webapp.base.xhtml import XHTMLView, XHTMLErrorView
48
47
from ivle.webapp.errors import HTTPError, Unauthorized, NotFound
50
def generate_route_mapper(view_plugins, attr):
48
from ivle.webapp.publisher import Publisher, PublishingError
49
from ivle.webapp import ApplicationRoot
51
config = ivle.config.Config()
53
class ObjectPermissionCheckingPublisher(Publisher):
54
"""A specialised publisher that checks object permissions.
56
This publisher verifies that the user holds any permission at all
57
on the model objects through which the resolution path passes. If
58
no permission is held, resolution is aborted with an Unauthorized
61
IMPORTANT: This does NOT check view permissions. It only checks
62
the objects in between the root and the view, exclusive!
65
def traversed_to_object(self, obj):
66
"""Check that the user has any permission at all over the object."""
67
if (hasattr(obj, 'get_permissions') and
68
len(obj.get_permissions(self.root.user, config)) == 0):
69
# Indicate the forbidden object if this is an admin.
70
if self.root.user and self.root.user.admin:
71
raise Unauthorized('Unauthorized: %s' % obj)
76
def generate_publisher(view_plugins, root, publicmode=False):
52
78
Build a Mapper object for doing URL matching using 'routes', based on the
53
79
given plugin registry.
55
m = routes.Mapper(explicit=True)
81
r = ObjectPermissionCheckingPublisher(root=root)
83
r.add_set_switch('api', 'api')
86
view_attr = 'public_views'
87
forward_route_attr = 'public_forward_routes'
88
reverse_route_attr = 'public_reverse_routes'
91
forward_route_attr = 'forward_routes'
92
reverse_route_attr = 'reverse_routes'
56
95
for plugin in view_plugins:
57
# Establish a URL pattern for each element of plugin.urls
58
assert hasattr(plugin, 'urls'), "%r does not have any urls" % plugin
59
for url in getattr(plugin, attr):
62
kwargs_dict = url[2] if len(url) >= 3 else {}
63
m.connect(routex, view=view_class, **kwargs_dict)
96
if hasattr(plugin, forward_route_attr):
97
for fr in getattr(plugin, forward_route_attr):
98
# An annotated function can also be passed in directly.
99
if hasattr(fr, '_forward_route_meta'):
100
r.add_forward_func(fr)
104
if hasattr(plugin, reverse_route_attr):
105
for rr in getattr(plugin, reverse_route_attr):
106
# An annotated function can also be passed in directly.
107
if hasattr(rr, '_reverse_route_src'):
108
r.add_reverse_func(rr)
112
if hasattr(plugin, view_attr):
113
for v in getattr(plugin, view_attr):
66
118
def handler(apachereq):
67
119
"""Handles an HTTP request.
82
134
if user and user.valid:
85
conf = ivle.config.Config()
89
req.mapper = generate_route_mapper(conf.plugin_index[PublicViewPlugin],
92
req.mapper = generate_route_mapper(conf.plugin_index[ViewPlugin],
95
matchdict = req.mapper.match(req.uri)
96
if matchdict is not None:
97
viewcls = matchdict['view']
98
# Get the remaining arguments, less 'view', 'action' and 'controller'
99
# (The latter two seem to be built-in, and we don't want them).
100
kwargs = matchdict.copy()
137
req.publisher = generate_publisher(
138
config.plugin_index[ViewPlugin],
139
ApplicationRoot(req.config, req.store, req.user),
140
publicmode=req.publicmode)
143
obj, viewcls, subpath = req.publisher.resolve(req.uri.decode('utf-8'))
145
# We 404 if we have a subpath but the view forbids it.
146
if not viewcls.subpath_allowed and subpath:
103
149
# Instantiate the view, which should be a BaseView class
104
view = viewcls(req, **kwargs)
150
view = viewcls(req, obj, subpath)
106
152
# Check that the request (mainly the user) is permitted to access
108
154
if not view.authorize(req):
155
# Indicate the forbidden object if this is an admin.
156
if req.user and req.user.admin:
157
raise Unauthorized('Unauthorized: %s' % view)
110
160
# Render the output
112
162
except HTTPError, e:
136
191
req.store.commit()
139
XHTMLErrorView(req, NotFound()).render(req)
193
except Unauthorized, e:
194
# Resolution failed due to a permission check. Display a pretty
195
# error, or maybe a login page.
196
XHTMLView.get_error_view(e)(req, e, req.publisher.root).render(req)
198
except PublishingError, e:
201
if req.user and req.user.admin:
202
XHTMLErrorView(req, NotFound('Not found: ' +
203
str(e.args)), e[0]).render(req)
205
XHTMLErrorView(req, NotFound(), e[0]).render(req)
142
209
def handle_unknown_exception(req, exc_type, exc_value, exc_traceback):
150
217
the IVLE request is created.
152
219
req.content_type = "text/html"
153
logfile = os.path.join(ivle.conf.log_path, 'ivle_error.log')
220
logfile = os.path.join(config['paths']['logs'], 'ivle_error.log')
223
# XXX: This remains here for ivle.interpret's IVLEErrors. Once we rewrite
224
# fileservice, req.status should always be 500 (ISE) here.
156
226
httpcode = exc_value.httpcode
157
227
req.status = httpcode
158
228
except AttributeError:
160
230
req.status = mod_python.apache.HTTP_INTERNAL_SERVER_ERROR
162
233
publicmode = req.publicmode
163
234
except AttributeError:
186
257
# misbehaves (which is currently very easy, if things aren't set up
188
259
# Write the traceback.
189
# If this is a non-4xx IVLEError, get the message and httpcode and
190
# make the error message a bit nicer (but still include the
192
# We also need to special-case IVLEJailError, as we can get another
261
# We need to special-case IVLEJailError, as we can get another
193
262
# almost-exception out of it.
195
codename, msg = None, None
197
263
if exc_type is util.IVLEJailError:
198
msg = exc_value.type_str + ": " + exc_value.message
199
264
tb = 'Exception information extracted from IVLEJailError:\n'
200
265
tb += urllib.unquote(exc_value.info)
203
codename, msg = req.get_http_codename(httpcode)
204
except AttributeError:
207
267
tb = ''.join(traceback.format_exception(exc_type, exc_value,
210
logging.error('%s\n%s'%(str(msg), tb))
270
logging.error('\n' + tb)
212
272
# Error messages are only displayed is the user is NOT a student,
213
273
# or if there has been a problem logging the error message