201 lines
8.6 KiB
Python
201 lines
8.6 KiB
Python
import sys
|
|
|
|
from django import http
|
|
from django.core import signals
|
|
from django.utils.encoding import force_unicode
|
|
|
|
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._request_middleware = []
|
|
self._view_middleware = []
|
|
self._response_middleware = []
|
|
self._exception_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__(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'):
|
|
self._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)
|
|
|
|
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''))
|
|
|