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from ivle import util
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from ivle.dispatch.request import Request
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import ivle.webapp.security
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from ivle.webapp.base.plugins import ViewPlugin, PublicViewPlugin
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from ivle.webapp.base.xhtml import XHTMLView, XHTMLErrorView
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from ivle.webapp.errors import BadRequest, HTTPError, NotFound, Unauthorized
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from ivle.webapp.publisher import Publisher, PublishingError
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from ivle.webapp import ApplicationRoot
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config = ivle.config.Config()
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class ObjectPermissionCheckingPublisher(Publisher):
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"""A specialised publisher that checks object permissions.
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This publisher verifies that the user holds any permission at all
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on the model objects through which the resolution path passes. If
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no permission is held, resolution is aborted with an Unauthorized
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IMPORTANT: This does NOT check view permissions. It only checks
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the objects in between the root and the view, exclusive!
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def traversed_to_object(self, obj):
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"""Check that the user has any permission at all over the object."""
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if (hasattr(obj, 'get_permissions') and
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len(obj.get_permissions(self.root.user, config)) == 0):
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# Indicate the forbidden object if this is an admin.
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if self.root.user and self.root.user.admin:
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raise Unauthorized('Unauthorized: %s' % obj)
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def generate_publisher(view_plugins, root, publicmode=False):
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from ivle.webapp.errors import HTTPError, Unauthorized, NotFound
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def generate_route_mapper(view_plugins, attr):
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Build a Mapper object for doing URL matching using 'routes', based on the
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given plugin registry.
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r = ObjectPermissionCheckingPublisher(root=root)
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r.add_set_switch('api', 'api')
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view_attr = 'public_views'
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forward_route_attr = 'public_forward_routes'
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reverse_route_attr = 'public_reverse_routes'
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forward_route_attr = 'forward_routes'
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reverse_route_attr = 'reverse_routes'
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m = routes.Mapper(explicit=True)
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for plugin in view_plugins:
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if hasattr(plugin, forward_route_attr):
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for fr in getattr(plugin, forward_route_attr):
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# An annotated function can also be passed in directly.
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if hasattr(fr, '_forward_route_meta'):
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r.add_forward_func(fr)
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if hasattr(plugin, reverse_route_attr):
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for rr in getattr(plugin, reverse_route_attr):
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# An annotated function can also be passed in directly.
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if hasattr(rr, '_reverse_route_src'):
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r.add_reverse_func(rr)
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if hasattr(plugin, view_attr):
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for v in getattr(plugin, view_attr):
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# Establish a URL pattern for each element of plugin.urls
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assert hasattr(plugin, 'urls'), "%r does not have any urls" % plugin
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for url in getattr(plugin, attr):
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kwargs_dict = url[2] if len(url) >= 3 else {}
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m.connect(routex, view=view_class, **kwargs_dict)
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def handler(apachereq):
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"""Handles an HTTP request.
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@param apachereq: An Apache request object.
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# Make the request object into an IVLE request which can be given to views
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req = Request(apachereq, config)
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req.publisher = generate_publisher(
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config.plugin_index[ViewPlugin], ApplicationRoot(req),
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publicmode=req.publicmode)
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obj, viewcls, subpath = req.publisher.resolve(req.uri.decode('utf-8'))
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req = Request(apachereq)
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# Hack? Try and get the user login early just in case we throw an error
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# (most likely 404) to stop us seeing not logged in even when we are.
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if not req.publicmode:
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user = ivle.webapp.security.get_user_details(req)
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# Don't set the user if it is disabled or hasn't accepted the ToS.
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if user and user.valid:
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conf = ivle.config.Config()
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req.mapper = generate_route_mapper(conf.plugin_index[PublicViewPlugin],
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req.mapper = generate_route_mapper(conf.plugin_index[ViewPlugin],
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matchdict = req.mapper.match(req.uri)
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if matchdict is not None:
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viewcls = matchdict['view']
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# Get the remaining arguments, less 'view', 'action' and 'controller'
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# (The latter two seem to be built-in, and we don't want them).
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kwargs = matchdict.copy()
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# We 404 if we have a subpath but the view forbids it.
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if not viewcls.subpath_allowed and subpath:
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# Instantiate the view, which should be a BaseView class
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view = viewcls(req, obj, subpath)
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view = viewcls(req, **kwargs)
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# Check that the request (mainly the user) is permitted to access
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if not view.authorize(req):
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# Indicate the forbidden object if this is an admin.
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if req.user and req.user.admin:
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raise Unauthorized('Unauthorized: %s' % view)
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# Non-GET requests from other sites leave us vulnerable to
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referer = req.headers_in.get('Referer')
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if (referer is None or
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urlparse.urlparse(req.headers_in.get('Referer')).netloc !=
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if req.method != 'GET' and not view.offsite_posts_allowed:
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"Non-GET requests from external sites are forbidden "
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"for security reasons.")
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# Render the output
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except HTTPError, e:
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except mod_python.apache.SERVER_RETURN:
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# A mod_python-specific Apache error.
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# XXX: We need to raise these because req.throw_error() uses them.
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# Remove this after Google Code issue 117 is fixed.
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except Exception, e:
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# A non-HTTPError appeared. We have an unknown exception. Panic.
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handle_unknown_exception(req, *sys.exc_info())
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# Commit the transaction if we have a store open.
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except Unauthorized, e:
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# Resolution failed due to a permission check. Display a pretty
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# error, or maybe a login page.
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XHTMLView.get_error_view(e)(req, e, req.publisher.root).render(req)
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except PublishingError, e:
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if req.user and req.user.admin:
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XHTMLErrorView(req, NotFound('Not found: ' +
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str(e.args)), e[0]).render(req)
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XHTMLErrorView(req, NotFound(), e[0]).render(req)
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# Make sure we close the store.
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XHTMLErrorView(req, NotFound()).render(req)
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def handle_unknown_exception(req, exc_type, exc_value, exc_traceback):
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# misbehaves (which is currently very easy, if things aren't set up
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# Write the traceback.
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# We need to special-case IVLEJailError, as we can get another
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# If this is a non-4xx IVLEError, get the message and httpcode and
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# make the error message a bit nicer (but still include the
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# We also need to special-case IVLEJailError, as we can get another
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# almost-exception out of it.
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codename, msg = None, None
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if exc_type is util.IVLEJailError:
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msg = exc_value.type_str + ": " + exc_value.message
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tb = 'Exception information extracted from IVLEJailError:\n'
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tb += urllib.unquote(exc_value.info)
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codename, msg = req.get_http_codename(httpcode)
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except AttributeError:
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tb = ''.join(traceback.format_exception(exc_type, exc_value,
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logging.error('\n' + tb)
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logging.error('%s\n%s'%(str(msg), tb))
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# Error messages are only displayed is the user is NOT a student,
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# or if there has been a problem logging the error message
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show_errors = (not publicmode) and ((login and req.user.admin) or logfail)
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show_errors = (not publicmode) and ((login and \
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str(role) != "student") or logfail)
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req.write("""<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head><title>IVLE Internal Server Error</title></head>
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<h1>IVLE Internal Server Error</h1>
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<h1>IVLE Internal Server Error""")
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if codename is not None and \
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httpcode != mod_python.apache.HTTP_INTERNAL_SERVER_ERROR:
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req.write(": %s" % cgi.escape(codename))
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<p>An error has occured which is the fault of the IVLE developers or
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administrators. """)
added
removed
ivle/dispatch/__init__.py
