41
43
from ivle import util
43
46
from ivle.dispatch.request import Request
44
import ivle.webapp.security
45
from ivle.webapp.base.plugins import ViewPlugin, PublicViewPlugin
46
from ivle.webapp.base.xhtml import XHTMLView, XHTMLErrorView
47
from ivle.webapp.errors import HTTPError, Unauthorized, NotFound
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)) == 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):
47
from ivle.dispatch import login
48
from ivle.webapp.base.plugins import ViewPlugin
49
from ivle.webapp.errors import HTTPError, Unauthorized
53
# XXX List of plugins, which will eventually be read in from conf
55
'ivle.webapp.core#Plugin',
56
'ivle.webapp.admin.user#Plugin',
57
'ivle.webapp.tutorial#Plugin',
58
'ivle.webapp.admin.subject#Plugin',
59
'ivle.webapp.filesystem.browser#Plugin',
60
'ivle.webapp.filesystem.diff#Plugin',
61
'ivle.webapp.filesystem.svnlog#Plugin',
62
'ivle.webapp.groups#Plugin',
63
'ivle.webapp.console#Plugin',
64
'ivle.webapp.security#Plugin',
65
'ivle.webapp.media#Plugin',
66
'ivle.webapp.forum#Plugin',
67
'ivle.webapp.help#Plugin',
68
'ivle.webapp.tos#Plugin',
71
def generate_route_mapper(view_plugins):
78
73
Build a Mapper object for doing URL matching using 'routes', based on the
79
74
given plugin registry.
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'
76
m = routes.Mapper(explicit=True)
95
77
for plugin in view_plugins:
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):
118
def handler(apachereq):
119
"""Handles an HTTP request.
78
# Establish a URL pattern for each element of plugin.urls
79
assert hasattr(plugin, 'urls'), "%r does not have any urls" % plugin
80
for url in plugin.urls:
83
kwargs_dict = url[2] if len(url) >= 3 else {}
84
m.connect(routex, view=view_class, **kwargs_dict)
87
def get_plugin(pluginstr):
88
plugin_path, classname = pluginstr.split('#')
89
# Load the plugin module from somewhere in the Python path
90
# (Note that plugin_path is a fully-qualified Python module name).
92
getattr(__import__(plugin_path, fromlist=[classname]), classname))
95
"""Handles a request which may be to anywhere in the site except media.
121
96
Intended to be called by mod_python, as a handler.
123
@param apachereq: An Apache request object.
125
# Make the request object into an IVLE request which can be given to views
126
req = Request(apachereq, config)
98
req: An Apache request object.
100
# Make the request object into an IVLE request which can be passed to apps
103
req = Request(req, html.write_html_head)
105
# Pass the apachereq to error reporter, since ivle req isn't created
107
handle_unknown_exception(apachereq, *sys.exc_info())
108
# Tell Apache not to generate its own errors as well
109
return mod_python.apache.OK
111
# Run the main handler, and catch all exceptions
113
return handler_(req, apachereq)
114
except mod_python.apache.SERVER_RETURN:
115
# An apache error. We discourage these, but they might still happen.
119
handle_unknown_exception(req, *sys.exc_info())
120
# Tell Apache not to generate its own errors as well
121
return mod_python.apache.OK
123
def handler_(req, apachereq):
125
Nested handler function. May raise exceptions. The top-level handler is
126
just used to catch exceptions.
127
Takes both an IVLE request and an Apache req.
128
129
# Hack? Try and get the user login early just in case we throw an error
129
130
# (most likely 404) to stop us seeing not logged in even when we are.
130
131
if not req.publicmode:
131
user = ivle.webapp.security.get_user_details(req)
132
user = login.get_user_details(req)
133
134
# Don't set the user if it is disabled or hasn't accepted the ToS.
134
135
if user and user.valid:
137
req.publisher = generate_publisher(
138
config.plugin_index[ViewPlugin],
139
ApplicationRoot(req.config, req.store, req.user),
140
publicmode=req.publicmode)
138
### BEGIN New plugins framework ###
139
# XXX This should be done ONCE per Python process, not per request.
141
# XXX No authentication is done here
142
req.plugins = dict([get_plugin(pluginstr) for pluginstr in plugins_HACK])
143
# Index the plugins by base class
144
req.plugin_index = {}
145
for plugin in req.plugins.values():
146
# Getmro returns a tuple of all the super-classes of the plugin
147
for base in inspect.getmro(plugin):
148
if base not in req.plugin_index:
149
req.plugin_index[base] = []
150
req.plugin_index[base].append(plugin)
151
req.reverse_plugins = dict([(v, k) for (k, v) in req.plugins.items()])
152
req.mapper = generate_route_mapper(req.plugin_index[ViewPlugin])
143
obj, viewcls, subpath = req.publisher.resolve(req.uri.decode('utf-8'))
154
matchdict = req.mapper.match(req.uri)
155
if matchdict is not None:
156
viewcls = matchdict['view']
157
# Get the remaining arguments, less 'view', 'action' and 'controller'
158
# (The latter two seem to be built-in, and we don't want them).
159
kwargs = matchdict.copy()
145
# We 404 if we have a subpath but the view forbids it.
146
if not viewcls.subpath_allowed and subpath:
149
162
# Instantiate the view, which should be a BaseView class
150
view = viewcls(req, obj, subpath)
163
view = viewcls(req, **kwargs)
152
165
# Check that the request (mainly the user) is permitted to access
154
167
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)
160
169
# Render the output
162
171
except HTTPError, e:
191
193
req.store.commit()
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)
195
### END New plugins framework ###
197
# Check req.app to see if it is valid. 404 if not.
198
if req.app is not None and req.app not in ivle.conf.apps.app_url:
199
req.throw_error(Request.HTTP_NOT_FOUND,
200
"There is no application called %s." % repr(req.app))
202
# Special handling for public mode - only allow the public app, call it
204
# NOTE: This will not behave correctly if the public app uses
205
# write_html_head_foot, but "serve" does not.
207
if req.app != ivle.conf.apps.public_app:
208
req.throw_error(Request.HTTP_FORBIDDEN,
209
"This application is not available on the public site.")
210
app = ivle.conf.apps.app_url[ivle.conf.apps.public_app]
211
apps.call_app(app.dir, 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)
214
# app is the App object for the chosen app
216
app = ivle.conf.apps.app_url[ivle.conf.apps.default_app]
218
app = ivle.conf.apps.app_url[req.app]
220
# Check if app requires auth. If so, perform authentication and login.
221
# This will either return a User object, None, or perform a redirect
222
# which we will not catch here.
224
logged_in = req.user is not None
228
assert logged_in # XXX
231
# Keep the user's session alive by writing to the session object.
232
# req.get_session().save()
233
# Well, it's a fine idea, but it creates considerable grief in the
234
# concurrent update department, so instead, we'll just make the
235
# sessions not time out.
236
req.get_session().unlock()
238
# If user did not specify an app, HTTP redirect to default app and
241
req.throw_redirect(util.make_path(ivle.conf.apps.default_app))
243
# Set the default title to the app's tab name, if any. Otherwise URL
245
if app.name is not None:
205
XHTMLErrorView(req, NotFound(), e[0]).render(req)
250
# Call the specified app with the request object
251
apps.call_app(app.dir, req)
253
# if not logged in, login.login will have written the login box.
254
# Just clean up and exit.
256
# MAKE SURE we write the HTTP (and possibly HTML) header. This
257
# wouldn't happen if nothing else ever got written, so we have to make
259
req.ensure_headers_written()
261
# When done, write out the HTML footer if the app has requested it
262
if req.write_html_head_foot:
263
html.write_html_foot(req)
265
# Note: Apache will not write custom HTML error messages here.
266
# Use req.throw_error to do that.
209
269
def handle_unknown_exception(req, exc_type, exc_value, exc_traceback):
256
# A "bad" error message. We shouldn't get here unless IVLE
257
# misbehaves (which is currently very easy, if things aren't set up
259
# Write the traceback.
261
# We need to special-case IVLEJailError, as we can get another
262
# almost-exception out of it.
263
if exc_type is util.IVLEJailError:
264
tb = 'Exception information extracted from IVLEJailError:\n'
265
tb += urllib.unquote(exc_value.info)
325
logging.debug('Logging Unhandled Exception')
327
# We handle 3 types of error.
328
# IVLEErrors with 4xx response codes (client error).
329
# IVLEErrors with 5xx response codes (handled server error).
330
# Other exceptions (unhandled server error).
331
# IVLEErrors should not have other response codes than 4xx or 5xx
332
# (eg. throw_redirect should have been used for 3xx codes).
333
# Therefore, that is treated as an unhandled error.
335
if (exc_type == util.IVLEError and httpcode >= 400
336
and httpcode <= 499):
337
# IVLEErrors with 4xx response codes are client errors.
338
# Therefore, these have a "nice" response (we even coat it in the IVLE
341
req.write_html_head_foot = True
342
req.write_javascript_settings = False
343
req.write('<div id="ivle_padding">\n')
345
codename, msg = req.get_http_codename(httpcode)
346
except AttributeError:
347
codename, msg = None, None
348
# Override the default message with the supplied one,
350
if exc_value.message is not None:
351
msg = exc_value.message
352
if codename is not None:
353
req.write("<h1>Error: %s</h1>\n" % cgi.escape(codename))
355
req.write("<h1>Error</h1>\n")
357
req.write("<p>%s</p>\n" % cgi.escape(msg))
359
req.write("<p>An unknown error occured.</p>\n")
362
logging.info(str(msg))
364
req.write("<p>(HTTP error code %d)</p>\n" % httpcode)
366
req.write("<p>Warning: Could not open Error Log: '%s'</p>\n"
367
%cgi.escape(logfile))
368
req.write('</div>\n')
369
html.write_html_foot(req)
267
tb = ''.join(traceback.format_exception(exc_type, exc_value,
270
logging.error('\n' + tb)
272
# Error messages are only displayed is the user is NOT a student,
273
# or if there has been a problem logging the error message
274
show_errors = (not publicmode) and ((login and req.user.admin) or logfail)
275
req.write("""<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
371
# A "bad" error message. We shouldn't get here unless IVLE
372
# misbehaves (which is currently very easy, if things aren't set up
374
# Write the traceback.
375
# If this is a non-4xx IVLEError, get the message and httpcode and
376
# make the error message a bit nicer (but still include the
378
# We also need to special-case IVLEJailError, as we can get another
379
# almost-exception out of it.
381
codename, msg = None, None
383
if exc_type is util.IVLEJailError:
384
msg = exc_value.type_str + ": " + exc_value.message
385
tb = 'Exception information extracted from IVLEJailError:\n'
386
tb += urllib.unquote(exc_value.info)
389
codename, msg = req.get_http_codename(httpcode)
390
except AttributeError:
392
# Override the default message with the supplied one,
394
if hasattr(exc_value, 'message') and exc_value.message is not None:
395
msg = exc_value.message
396
# Prepend the exception type
397
if exc_type != util.IVLEError:
398
msg = exc_type.__name__ + ": " + msg
400
tb = ''.join(traceback.format_exception(exc_type, exc_value,
404
logging.error('%s\n%s'%(str(msg), tb))
405
# Error messages are only displayed is the user is NOT a student,
406
# or if there has been a problem logging the error message
407
show_errors = (not publicmode) and ((login and \
408
str(role) != "student") or logfail)
409
req.write("""<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
276
410
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
277
411
<html xmlns="http://www.w3.org/1999/xhtml">
278
412
<head><title>IVLE Internal Server Error</title></head>
280
<h1>IVLE Internal Server Error</h1>
414
<h1>IVLE Internal Server Error""")
416
if (codename is not None
417
and httpcode != mod_python.apache.HTTP_INTERNAL_SERVER_ERROR):
418
req.write(": %s" % cgi.escape(codename))
281
421
<p>An error has occured which is the fault of the IVLE developers or
285
req.write("Please report this issue to the server administrators, "
286
"along with the following information.")
288
req.write("Details have been logged for further examination.")
292
req.write("<h2>Debugging information</h2>")
293
req.write("<pre>\n%s\n</pre>\n"%cgi.escape(tb))
294
req.write("</body></html>")
422
administration. The developers have been notified.</p>
426
req.write("<p>%s</p>\n" % cgi.escape(msg))
427
if httpcode is not None:
428
req.write("<p>(HTTP error code %d)</p>\n" % httpcode)
430
<p>Please report this to <a href="mailto:%s">%s</a> (the system
431
administrator). Include the following information:</p>
432
""" % (cgi.escape(admin_email), cgi.escape(admin_email)))
434
req.write("<pre>\n%s\n</pre>\n"%cgi.escape(tb))
436
req.write("<p>Warning: Could not open Error Log: '%s'</p>\n"
437
%cgi.escape(logfile))
438
req.write("</body></html>")
added
removed
ivle/dispatch/__init__.py
