--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/web/lib/django/core/handlers/base.py Wed Jan 20 00:34:04 2010 +0100
@@ -0,0 +1,206 @@
+import sys
+
+from django import http
+from django.core import signals
+from django.utils.encoding import force_unicode
+from django.utils.importlib import import_module
+
+class BaseHandler(object):
+ # Changes that are always applied to a response (in this order).
+ response_fixes = [
+ http.fix_location_header,
+ http.conditional_content_removal,
+ http.fix_IE_for_attach,
+ http.fix_IE_for_vary,
+ ]
+
+ def __init__(self):
+ self._request_middleware = self._view_middleware = self._response_middleware = self._exception_middleware = None
+
+ def load_middleware(self):
+ """
+ Populate middleware lists from settings.MIDDLEWARE_CLASSES.
+
+ Must be called after the environment is fixed (see __call__).
+ """
+ from django.conf import settings
+ from django.core import exceptions
+ self._view_middleware = []
+ self._response_middleware = []
+ self._exception_middleware = []
+
+ request_middleware = []
+ for middleware_path in settings.MIDDLEWARE_CLASSES:
+ try:
+ dot = middleware_path.rindex('.')
+ except ValueError:
+ raise exceptions.ImproperlyConfigured, '%s isn\'t a middleware module' % middleware_path
+ mw_module, mw_classname = middleware_path[:dot], middleware_path[dot+1:]
+ try:
+ mod = import_module(mw_module)
+ except ImportError, e:
+ raise exceptions.ImproperlyConfigured, 'Error importing middleware %s: "%s"' % (mw_module, e)
+ try:
+ mw_class = getattr(mod, mw_classname)
+ except AttributeError:
+ raise exceptions.ImproperlyConfigured, 'Middleware module "%s" does not define a "%s" class' % (mw_module, mw_classname)
+
+ try:
+ mw_instance = mw_class()
+ except exceptions.MiddlewareNotUsed:
+ continue
+
+ if hasattr(mw_instance, 'process_request'):
+ request_middleware.append(mw_instance.process_request)
+ if hasattr(mw_instance, 'process_view'):
+ self._view_middleware.append(mw_instance.process_view)
+ if hasattr(mw_instance, 'process_response'):
+ self._response_middleware.insert(0, mw_instance.process_response)
+ if hasattr(mw_instance, 'process_exception'):
+ self._exception_middleware.insert(0, mw_instance.process_exception)
+
+ # We only assign to this when initialization is complete as it is used
+ # as a flag for initialization being complete.
+ self._request_middleware = request_middleware
+
+ def get_response(self, request):
+ "Returns an HttpResponse object for the given HttpRequest"
+ from django.core import exceptions, urlresolvers
+ from django.conf import settings
+
+ # Apply request middleware
+ for middleware_method in self._request_middleware:
+ response = middleware_method(request)
+ if response:
+ return response
+
+ # Get urlconf from request object, if available. Otherwise use default.
+ urlconf = getattr(request, "urlconf", settings.ROOT_URLCONF)
+
+ resolver = urlresolvers.RegexURLResolver(r'^/', urlconf)
+ try:
+ callback, callback_args, callback_kwargs = resolver.resolve(
+ request.path_info)
+
+ # Apply view middleware
+ for middleware_method in self._view_middleware:
+ response = middleware_method(request, callback, callback_args, callback_kwargs)
+ if response:
+ return response
+
+ try:
+ response = callback(request, *callback_args, **callback_kwargs)
+ except Exception, e:
+ # If the view raised an exception, run it through exception
+ # middleware, and if the exception middleware returns a
+ # response, use that. Otherwise, reraise the exception.
+ for middleware_method in self._exception_middleware:
+ response = middleware_method(request, e)
+ if response:
+ return response
+ raise
+
+ # Complain if the view returned None (a common error).
+ if response is None:
+ try:
+ view_name = callback.func_name # If it's a function
+ except AttributeError:
+ view_name = callback.__class__.__name__ + '.__call__' # If it's a class
+ raise ValueError, "The view %s.%s didn't return an HttpResponse object." % (callback.__module__, view_name)
+
+ return response
+ except http.Http404, e:
+ if settings.DEBUG:
+ from django.views import debug
+ return debug.technical_404_response(request, e)
+ else:
+ try:
+ callback, param_dict = resolver.resolve404()
+ return callback(request, **param_dict)
+ except:
+ try:
+ return self.handle_uncaught_exception(request, resolver, sys.exc_info())
+ finally:
+ receivers = signals.got_request_exception.send(sender=self.__class__, request=request)
+ except exceptions.PermissionDenied:
+ return http.HttpResponseForbidden('<h1>Permission denied</h1>')
+ except SystemExit:
+ # Allow sys.exit() to actually exit. See tickets #1023 and #4701
+ raise
+ except: # Handle everything else, including SuspiciousOperation, etc.
+ # Get the exception info now, in case another exception is thrown later.
+ exc_info = sys.exc_info()
+ receivers = signals.got_request_exception.send(sender=self.__class__, request=request)
+ return self.handle_uncaught_exception(request, resolver, exc_info)
+
+ def handle_uncaught_exception(self, request, resolver, exc_info):
+ """
+ Processing for any otherwise uncaught exceptions (those that will
+ generate HTTP 500 responses). Can be overridden by subclasses who want
+ customised 500 handling.
+
+ Be *very* careful when overriding this because the error could be
+ caused by anything, so assuming something like the database is always
+ available would be an error.
+ """
+ from django.conf import settings
+ from django.core.mail import mail_admins
+
+ if settings.DEBUG_PROPAGATE_EXCEPTIONS:
+ raise
+
+ if settings.DEBUG:
+ from django.views import debug
+ return debug.technical_500_response(request, *exc_info)
+
+ # When DEBUG is False, send an error message to the admins.
+ subject = 'Error (%s IP): %s' % ((request.META.get('REMOTE_ADDR') in settings.INTERNAL_IPS and 'internal' or 'EXTERNAL'), request.path)
+ try:
+ request_repr = repr(request)
+ except:
+ request_repr = "Request repr() unavailable"
+ message = "%s\n\n%s" % (self._get_traceback(exc_info), request_repr)
+ mail_admins(subject, message, fail_silently=True)
+ # Return an HttpResponse that displays a friendly error message.
+ callback, param_dict = resolver.resolve500()
+ return callback(request, **param_dict)
+
+ def _get_traceback(self, exc_info=None):
+ "Helper function to return the traceback as a string"
+ import traceback
+ return '\n'.join(traceback.format_exception(*(exc_info or sys.exc_info())))
+
+ def apply_response_fixes(self, request, response):
+ """
+ Applies each of the functions in self.response_fixes to the request and
+ response, modifying the response in the process. Returns the new
+ response.
+ """
+ for func in self.response_fixes:
+ response = func(request, response)
+ return response
+
+def get_script_name(environ):
+ """
+ Returns the equivalent of the HTTP request's SCRIPT_NAME environment
+ variable. If Apache mod_rewrite has been used, returns what would have been
+ the script name prior to any rewriting (so it's the script name as seen
+ from the client's perspective), unless DJANGO_USE_POST_REWRITE is set (to
+ anything).
+ """
+ from django.conf import settings
+ if settings.FORCE_SCRIPT_NAME is not None:
+ return force_unicode(settings.FORCE_SCRIPT_NAME)
+
+ # If Apache's mod_rewrite had a whack at the URL, Apache set either
+ # SCRIPT_URL or REDIRECT_URL to the full resource URL before applying any
+ # rewrites. Unfortunately not every webserver (lighttpd!) passes this
+ # information through all the time, so FORCE_SCRIPT_NAME, above, is still
+ # needed.
+ script_url = environ.get('SCRIPT_URL', u'')
+ if not script_url:
+ script_url = environ.get('REDIRECT_URL', u'')
+ if script_url:
+ return force_unicode(script_url[:-len(environ.get('PATH_INFO', ''))])
+ return force_unicode(environ.get('SCRIPT_NAME', u''))
+