275 lines
12 KiB
Python
275 lines
12 KiB
Python
from __future__ import unicode_literals
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import logging
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import sys
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import types
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from django import http
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from django.conf import settings
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from django.core import urlresolvers
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from django.core import signals
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from django.core.exceptions import MiddlewareNotUsed, PermissionDenied
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from django.db import connections, transaction
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from django.utils.encoding import force_text
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from django.utils.module_loading import import_by_path
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from django.utils import six
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from django.views import debug
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logger = logging.getLogger('django.request')
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class BaseHandler(object):
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# Changes that are always applied to a response (in this order).
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response_fixes = [
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http.fix_location_header,
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http.conditional_content_removal,
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http.fix_IE_for_attach,
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http.fix_IE_for_vary,
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]
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def __init__(self):
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self._request_middleware = self._view_middleware = self._template_response_middleware = self._response_middleware = self._exception_middleware = None
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def load_middleware(self):
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"""
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Populate middleware lists from settings.MIDDLEWARE_CLASSES.
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Must be called after the environment is fixed (see __call__ in subclasses).
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"""
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self._view_middleware = []
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self._template_response_middleware = []
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self._response_middleware = []
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self._exception_middleware = []
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request_middleware = []
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for middleware_path in settings.MIDDLEWARE_CLASSES:
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mw_class = import_by_path(middleware_path)
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try:
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mw_instance = mw_class()
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except MiddlewareNotUsed:
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continue
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if hasattr(mw_instance, 'process_request'):
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request_middleware.append(mw_instance.process_request)
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if hasattr(mw_instance, 'process_view'):
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self._view_middleware.append(mw_instance.process_view)
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if hasattr(mw_instance, 'process_template_response'):
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self._template_response_middleware.insert(0, mw_instance.process_template_response)
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if hasattr(mw_instance, 'process_response'):
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self._response_middleware.insert(0, mw_instance.process_response)
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if hasattr(mw_instance, 'process_exception'):
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self._exception_middleware.insert(0, mw_instance.process_exception)
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# We only assign to this when initialization is complete as it is used
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# as a flag for initialization being complete.
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self._request_middleware = request_middleware
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def make_view_atomic(self, view):
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if getattr(view, 'transactions_per_request', True):
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for db in connections.all():
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if db.settings_dict['ATOMIC_REQUESTS']:
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view = transaction.atomic(using=db.alias)(view)
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return view
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def get_response(self, request):
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"Returns an HttpResponse object for the given HttpRequest"
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try:
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# Setup default url resolver for this thread, this code is outside
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# the try/except so we don't get a spurious "unbound local
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# variable" exception in the event an exception is raised before
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# resolver is set
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urlconf = settings.ROOT_URLCONF
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urlresolvers.set_urlconf(urlconf)
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resolver = urlresolvers.RegexURLResolver(r'^/', urlconf)
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try:
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response = None
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# Apply request middleware
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for middleware_method in self._request_middleware:
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response = middleware_method(request)
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if response:
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break
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if response is None:
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if hasattr(request, 'urlconf'):
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# Reset url resolver with a custom urlconf.
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urlconf = request.urlconf
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urlresolvers.set_urlconf(urlconf)
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resolver = urlresolvers.RegexURLResolver(r'^/', urlconf)
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resolver_match = resolver.resolve(request.path_info)
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callback, callback_args, callback_kwargs = resolver_match
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request.resolver_match = resolver_match
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# Apply view middleware
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for middleware_method in self._view_middleware:
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response = middleware_method(request, callback, callback_args, callback_kwargs)
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if response:
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break
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if response is None:
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wrapped_callback = self.make_view_atomic(callback)
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try:
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response = wrapped_callback(request, *callback_args, **callback_kwargs)
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except Exception as e:
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# If the view raised an exception, run it through exception
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# middleware, and if the exception middleware returns a
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# response, use that. Otherwise, reraise the exception.
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for middleware_method in self._exception_middleware:
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response = middleware_method(request, e)
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if response:
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break
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if response is None:
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raise
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# Complain if the view returned None (a common error).
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if response is None:
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if isinstance(callback, types.FunctionType): # FBV
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view_name = callback.__name__
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else: # CBV
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view_name = callback.__class__.__name__ + '.__call__'
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raise ValueError("The view %s.%s didn't return an HttpResponse object." % (callback.__module__, view_name))
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# If the response supports deferred rendering, apply template
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# response middleware and then render the response
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if hasattr(response, 'render') and callable(response.render):
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for middleware_method in self._template_response_middleware:
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response = middleware_method(request, response)
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response = response.render()
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except http.Http404 as e:
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logger.warning('Not Found: %s', request.path,
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extra={
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'status_code': 404,
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'request': request
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})
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if settings.DEBUG:
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response = debug.technical_404_response(request, e)
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else:
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try:
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callback, param_dict = resolver.resolve404()
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response = callback(request, **param_dict)
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except:
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signals.got_request_exception.send(sender=self.__class__, request=request)
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response = self.handle_uncaught_exception(request, resolver, sys.exc_info())
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except PermissionDenied:
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logger.warning(
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'Forbidden (Permission denied): %s', request.path,
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extra={
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'status_code': 403,
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'request': request
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})
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try:
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callback, param_dict = resolver.resolve403()
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response = callback(request, **param_dict)
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except:
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signals.got_request_exception.send(
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sender=self.__class__, request=request)
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response = self.handle_uncaught_exception(request,
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resolver, sys.exc_info())
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except SystemExit:
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# Allow sys.exit() to actually exit. See tickets #1023 and #4701
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raise
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except: # Handle everything else, including SuspiciousOperation, etc.
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# Get the exception info now, in case another exception is thrown later.
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signals.got_request_exception.send(sender=self.__class__, request=request)
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response = self.handle_uncaught_exception(request, resolver, sys.exc_info())
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finally:
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# Reset URLconf for this thread on the way out for complete
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# isolation of request.urlconf
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urlresolvers.set_urlconf(None)
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try:
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# Apply response middleware, regardless of the response
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for middleware_method in self._response_middleware:
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response = middleware_method(request, response)
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response = self.apply_response_fixes(request, response)
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except: # Any exception should be gathered and handled
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signals.got_request_exception.send(sender=self.__class__, request=request)
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response = self.handle_uncaught_exception(request, resolver, sys.exc_info())
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return response
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def handle_uncaught_exception(self, request, resolver, exc_info):
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"""
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Processing for any otherwise uncaught exceptions (those that will
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generate HTTP 500 responses). Can be overridden by subclasses who want
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customised 500 handling.
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Be *very* careful when overriding this because the error could be
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caused by anything, so assuming something like the database is always
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available would be an error.
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"""
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if settings.DEBUG_PROPAGATE_EXCEPTIONS:
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raise
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logger.error('Internal Server Error: %s', request.path,
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exc_info=exc_info,
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extra={
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'status_code': 500,
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'request': request
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}
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)
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if settings.DEBUG:
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return debug.technical_500_response(request, *exc_info)
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# If Http500 handler is not installed, re-raise last exception
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if resolver.urlconf_module is None:
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six.reraise(*exc_info)
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# Return an HttpResponse that displays a friendly error message.
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callback, param_dict = resolver.resolve500()
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return callback(request, **param_dict)
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def apply_response_fixes(self, request, response):
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"""
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Applies each of the functions in self.response_fixes to the request and
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response, modifying the response in the process. Returns the new
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response.
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"""
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for func in self.response_fixes:
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response = func(request, response)
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return response
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def get_path_info(environ):
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"""
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Returns the HTTP request's PATH_INFO as a unicode string.
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"""
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path_info = environ.get('PATH_INFO', str('/'))
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# Under Python 3, strings in environ are decoded with ISO-8859-1;
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# re-encode to recover the original bytestring provided by the webserver.
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if six.PY3:
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path_info = path_info.encode('iso-8859-1')
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# It'd be better to implement URI-to-IRI decoding, see #19508.
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return path_info.decode('utf-8')
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def get_script_name(environ):
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"""
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Returns the equivalent of the HTTP request's SCRIPT_NAME environment
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variable. If Apache mod_rewrite has been used, returns what would have been
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the script name prior to any rewriting (so it's the script name as seen
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from the client's perspective), unless the FORCE_SCRIPT_NAME setting is
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set (to anything).
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"""
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if settings.FORCE_SCRIPT_NAME is not None:
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return force_text(settings.FORCE_SCRIPT_NAME)
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# If Apache's mod_rewrite had a whack at the URL, Apache set either
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# SCRIPT_URL or REDIRECT_URL to the full resource URL before applying any
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# rewrites. Unfortunately not every Web server (lighttpd!) passes this
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# information through all the time, so FORCE_SCRIPT_NAME, above, is still
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# needed.
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script_url = environ.get('SCRIPT_URL', environ.get('REDIRECT_URL', str('')))
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if script_url:
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script_name = script_url[:-len(environ.get('PATH_INFO', str('')))]
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else:
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script_name = environ.get('SCRIPT_NAME', str(''))
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# Under Python 3, strings in environ are decoded with ISO-8859-1;
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# re-encode to recover the original bytestring provided by the webserver.
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if six.PY3:
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script_name = script_name.encode('iso-8859-1')
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# It'd be better to implement URI-to-IRI decoding, see #19508.
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return script_name.decode('utf-8')
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