45
45
import ivle.webapp.security
46
46
from ivle.webapp.base.plugins import ViewPlugin, PublicViewPlugin
47
47
from ivle.webapp.base.xhtml import XHTMLView, XHTMLErrorView
48
from ivle.webapp.errors import HTTPError, Unauthorized, NotFound
48
from ivle.webapp.errors import BadRequest, HTTPError, NotFound, Unauthorized
49
from ivle.webapp.publisher import Publisher, PublishingError
50
from ivle.webapp import ApplicationRoot
50
52
config = ivle.config.Config()
52
def generate_router(view_plugins, attr):
54
class ObjectPermissionCheckingPublisher(Publisher):
55
"""A specialised publisher that checks object permissions.
57
This publisher verifies that the user holds any permission at all
58
on the model objects through which the resolution path passes. If
59
no permission is held, resolution is aborted with an Unauthorized
62
IMPORTANT: This does NOT check view permissions. It only checks
63
the objects in between the root and the view, exclusive!
66
def traversed_to_object(self, obj):
67
"""Check that the user has any permission at all over the object."""
68
if (hasattr(obj, 'get_permissions') and
69
len(obj.get_permissions(self.root.user, config)) == 0):
70
# Indicate the forbidden object if this is an admin.
71
if self.root.user and self.root.user.admin:
72
raise Unauthorized('Unauthorized: %s' % obj)
77
def generate_publisher(view_plugins, root, publicmode=False):
54
79
Build a Mapper object for doing URL matching using 'routes', based on the
55
80
given plugin registry.
57
m = routes.Mapper(explicit=True)
82
r = ObjectPermissionCheckingPublisher(root=root)
84
r.add_set_switch('api', 'api')
87
view_attr = 'public_views'
88
forward_route_attr = 'public_forward_routes'
89
reverse_route_attr = 'public_reverse_routes'
92
forward_route_attr = 'forward_routes'
93
reverse_route_attr = 'reverse_routes'
58
96
for plugin in view_plugins:
59
# Establish a URL pattern for each element of plugin.urls
60
assert hasattr(plugin, 'urls'), "%r does not have any urls" % plugin
61
for url in getattr(plugin, attr):
64
kwargs_dict = url[2] if len(url) >= 3 else {}
65
m.connect(routex, view=view_class, **kwargs_dict)
97
if hasattr(plugin, forward_route_attr):
98
for fr in getattr(plugin, forward_route_attr):
99
# An annotated function can also be passed in directly.
100
if hasattr(fr, '_forward_route_meta'):
101
r.add_forward_func(fr)
105
if hasattr(plugin, reverse_route_attr):
106
for rr in getattr(plugin, reverse_route_attr):
107
# An annotated function can also be passed in directly.
108
if hasattr(rr, '_reverse_route_src'):
109
r.add_reverse_func(rr)
113
if hasattr(plugin, view_attr):
114
for v in getattr(plugin, view_attr):
68
119
def handler(apachereq):
69
120
"""Handles an HTTP request.
75
126
# Make the request object into an IVLE request which can be given to views
76
127
req = Request(apachereq, config)
78
# Hack? Try and get the user login early just in case we throw an error
79
# (most likely 404) to stop us seeing not logged in even when we are.
80
if not req.publicmode:
81
user = ivle.webapp.security.get_user_details(req)
83
# Don't set the user if it is disabled or hasn't accepted the ToS.
84
if user and user.valid:
88
req.mapper = generate_router(config.plugin_index[PublicViewPlugin],
91
req.mapper = generate_router(config.plugin_index[ViewPlugin], 'urls')
93
matchdict = req.mapper.match(req.uri)
94
if matchdict is not None:
95
viewcls = matchdict['view']
96
# Get the remaining arguments, less 'view', 'action' and 'controller'
97
# (The latter two seem to be built-in, and we don't want them).
98
kwargs = matchdict.copy()
129
req.publisher = generate_publisher(
130
config.plugin_index[ViewPlugin], ApplicationRoot(req),
131
publicmode=req.publicmode)
134
obj, viewcls, subpath = req.publisher.resolve(req.uri.decode('utf-8'))
136
# We 404 if we have a subpath but the view forbids it.
137
if not viewcls.subpath_allowed and subpath:
101
140
# Instantiate the view, which should be a BaseView class
102
view = viewcls(req, **kwargs)
141
view = viewcls(req, obj, subpath)
104
143
# Check that the request (mainly the user) is permitted to access
106
145
if not view.authorize(req):
146
# Indicate the forbidden object if this is an admin.
147
if req.user and req.user.admin:
148
raise Unauthorized('Unauthorized: %s' % view)
152
# Non-GET requests from other sites leave us vulnerable to
154
referer = req.headers_in.get('Referer')
155
if (referer is None or
156
urlparse.urlparse(req.headers_in.get('Referer')).netloc !=
158
if req.method != 'GET' and not view.offsite_posts_allowed:
160
"Non-GET requests from external sites are forbidden "
161
"for security reasons.")
108
163
# Render the output
110
165
except HTTPError, e:
136
191
handle_unknown_exception(req, *sys.exc_info())
194
# Commit the transaction if we have a store open.
142
XHTMLErrorView(req, NotFound()).render(req)
197
except Unauthorized, e:
198
# Resolution failed due to a permission check. Display a pretty
199
# error, or maybe a login page.
200
XHTMLView.get_error_view(e)(req, e, req.publisher.root).render(req)
202
except PublishingError, e:
205
if req.user and req.user.admin:
206
XHTMLErrorView(req, NotFound('Not found: ' +
207
str(e.args)), e[0]).render(req)
209
XHTMLErrorView(req, NotFound(), e[0]).render(req)
213
# Make sure we close the store.
145
216
def handle_unknown_exception(req, exc_type, exc_value, exc_traceback):
189
257
# misbehaves (which is currently very easy, if things aren't set up
191
259
# Write the traceback.
192
# If this is a non-4xx IVLEError, get the message and httpcode and
193
# make the error message a bit nicer (but still include the
195
# We also need to special-case IVLEJailError, as we can get another
261
# We need to special-case IVLEJailError, as we can get another
196
262
# almost-exception out of it.
198
codename, msg = None, None
200
263
if exc_type is util.IVLEJailError:
201
msg = exc_value.type_str + ": " + exc_value.message
202
264
tb = 'Exception information extracted from IVLEJailError:\n'
203
265
tb += urllib.unquote(exc_value.info)
206
codename, msg = req.get_http_codename(httpcode)
207
except AttributeError:
210
267
tb = ''.join(traceback.format_exception(exc_type, exc_value,
213
logging.error('%s\n%s'%(str(msg), tb))
270
logging.error('\n' + tb)
215
272
# Error messages are only displayed is the user is NOT a student,
216
273
# or if there has been a problem logging the error message
added
removed
ivle/dispatch/__init__.py
