django1/django/core/handlers/modpython.py

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from django.utils import datastructures, httpwrappers
from pprint import pformat
import os
# NOTE: do *not* import settings (or any module which eventually imports
# settings) until after ModPythonHandler has been called; otherwise os.environ
# won't be set up correctly (with respect to settings).
class ModPythonRequest(httpwrappers.HttpRequest):
def __init__(self, req):
self._req = req
self.path = req.uri
def __repr__(self):
return '<ModPythonRequest\npath:%s,\nGET:%s,\nPOST:%s,\nCOOKIES:%s,\nMETA:%s,\nuser:%s>' % \
(self.path, pformat(self.GET), pformat(self.POST), pformat(self.COOKIES),
pformat(self.META), pformat(self.user))
def get_full_path(self):
return '%s%s' % (self.path, self._req.args and ('?' + self._req.args) or '')
def _load_post_and_files(self):
"Populates self._post and self._files"
if self._req.headers_in.has_key('content-type') and self._req.headers_in['content-type'].startswith('multipart'):
self._post, self._files = httpwrappers.parse_file_upload(self._req.headers_in, self._req.read())
else:
self._post, self._files = httpwrappers.QueryDict(self._req.read()), datastructures.MultiValueDict()
def _get_request(self):
if not hasattr(self, '_request'):
self._request = datastructures.MergeDict(self.POST, self.GET)
return self._request
def _get_get(self):
if not hasattr(self, '_get'):
self._get = httpwrappers.QueryDict(self._req.args)
return self._get
def _set_get(self, get):
self._get = get
def _get_post(self):
if not hasattr(self, '_post'):
self._load_post_and_files()
return self._post
def _set_post(self, post):
self._post = post
def _get_cookies(self):
if not hasattr(self, '_cookies'):
self._cookies = httpwrappers.parse_cookie(self._req.headers_in.get('cookie', ''))
return self._cookies
def _set_cookies(self, cookies):
self._cookies = cookies
def _get_files(self):
if not hasattr(self, '_files'):
self._load_post_and_files()
return self._files
def _get_meta(self):
"Lazy loader that returns self.META dictionary"
if not hasattr(self, '_meta'):
self._meta = {
'AUTH_TYPE': self._req.ap_auth_type,
'CONTENT_LENGTH': self._req.clength, # This may be wrong
'CONTENT_TYPE': self._req.content_type, # This may be wrong
'GATEWAY_INTERFACE': 'CGI/1.1',
'PATH_INFO': self._req.path_info,
'PATH_TRANSLATED': None, # Not supported
'QUERY_STRING': self._req.args,
'REMOTE_ADDR': self._req.connection.remote_ip,
'REMOTE_HOST': None, # DNS lookups not supported
'REMOTE_IDENT': self._req.connection.remote_logname,
'REMOTE_USER': self._req.user,
'REQUEST_METHOD': self._req.method,
'SCRIPT_NAME': None, # Not supported
'SERVER_NAME': self._req.server.server_hostname,
'SERVER_PORT': self._req.server.port,
'SERVER_PROTOCOL': self._req.protocol,
'SERVER_SOFTWARE': 'mod_python'
}
for key, value in self._req.headers_in.items():
key = 'HTTP_' + key.upper().replace('-', '_')
self._meta[key] = value
return self._meta
def _load_session_and_user(self):
from django.models.auth import sessions
from django.conf.settings import AUTH_SESSION_COOKIE
session_cookie = self.COOKIES.get(AUTH_SESSION_COOKIE, '')
try:
self._session = sessions.get_session_from_cookie(session_cookie)
self._user = self._session.get_user()
except sessions.SessionDoesNotExist:
from django.parts.auth import anonymoususers
self._session = None
self._user = anonymoususers.AnonymousUser()
def _get_session(self):
if not hasattr(self, '_session'):
self._load_session_and_user()
return self._session
def _set_session(self, session):
self._session = session
def _get_user(self):
if not hasattr(self, '_user'):
self._load_session_and_user()
return self._user
def _set_user(self, user):
self._user = user
GET = property(_get_get, _set_get)
POST = property(_get_post, _set_post)
COOKIES = property(_get_cookies, _set_cookies)
FILES = property(_get_files)
META = property(_get_meta)
REQUEST = property(_get_request)
session = property(_get_session, _set_session)
user = property(_get_user, _set_user)
class ModPythonHandler:
def __init__(self):
self._request_middleware = self._view_middleware = self._response_middleware = None
def __call__(self, req):
# mod_python fakes the environ, and thus doesn't process SetEnv. This fixes that
os.environ.update(req.subprocess_env)
# now that the environ works we can see the correct settings, so imports
# that use settings now can work
from django.conf import settings
from django.core import db
# if we need to set up middleware, now that settings works we can do it now.
if self._request_middleware is None:
self.load_middleware()
try:
request = ModPythonRequest(req)
response = self.get_response(req.uri, request)
finally:
db.db.close()
# Apply response middleware
for middleware_method in self._response_middleware:
response = middleware_method(request, response)
# Convert our custom HttpResponse object back into the mod_python req.
populate_apache_request(response, req)
return 0 # mod_python.apache.OK
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 = []
for middleware_path in settings.MIDDLEWARE_CLASSES:
dot = middleware_path.rindex('.')
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)
def get_response(self, path, request):
"Returns an HttpResponse object for the given HttpRequest"
from django.core import db, exceptions, urlresolvers
from django.core.mail import mail_admins
from django.conf.settings import DEBUG, INTERNAL_IPS, ROOT_URLCONF
# Apply request middleware
for middleware_method in self._request_middleware:
response = middleware_method(request)
if response:
return response
conf_module = __import__(ROOT_URLCONF, '', '', [''])
resolver = urlresolvers.RegexURLResolver(conf_module.urlpatterns)
try:
callback, param_dict = resolver.resolve(path)
# Apply view middleware
for middleware_method in self._view_middleware:
response = middleware_method(request, callback, param_dict)
if response:
return response
return callback(request, **param_dict)
except exceptions.Http404:
if DEBUG:
return self.get_technical_error_response(is404=True)
else:
resolver = urlresolvers.Error404Resolver(conf_module.handler404)
callback, param_dict = resolver.resolve()
return callback(request, **param_dict)
except db.DatabaseError:
db.db.rollback()
if DEBUG:
return self.get_technical_error_response()
else:
subject = 'Database error (%s IP)' % (request.META['REMOTE_ADDR'] in INTERNAL_IPS and 'internal' or 'EXTERNAL')
message = "%s\n\n%s" % (self._get_traceback(), request)
mail_admins(subject, message, fail_silently=True)
return self.get_friendly_error_response(request, conf_module)
except exceptions.PermissionDenied:
return httpwrappers.HttpResponseForbidden('<h1>Permission denied</h1>')
except: # Handle everything else, including SuspiciousOperation, etc.
if DEBUG:
return self.get_technical_error_response()
else:
subject = 'Coding error (%s IP)' % (request.META['REMOTE_ADDR'] in INTERNAL_IPS and 'internal' or 'EXTERNAL')
message = "%s\n\n%s" % (self._get_traceback(), request)
mail_admins(subject, message, fail_silently=True)
return self.get_friendly_error_response(request, conf_module)
def get_friendly_error_response(self, request, conf_module):
"""
Returns an HttpResponse that displays a PUBLIC error message for a
fundamental database or coding error.
"""
from django.core import urlresolvers
resolver = urlresolvers.Error404Resolver(conf_module.handler500)
callback, param_dict = resolver.resolve()
return callback(request, **param_dict)
def get_technical_error_response(self, is404=False):
"""
Returns an HttpResponse that displays a TECHNICAL error message for a
fundamental database or coding error.
"""
error_string = "<pre>There's been an error:\n\n%s</pre>" % self._get_traceback()
responseClass = is404 and httpwrappers.HttpResponseNotFound or httpwrappers.HttpResponseServerError
return responseClass(error_string)
def _get_traceback(self):
"Helper function to return the traceback as a string"
import sys, traceback
return '\n'.join(traceback.format_exception(*sys.exc_info()))
def populate_apache_request(http_response, mod_python_req):
"Populates the mod_python request object with an HttpResponse"
mod_python_req.content_type = http_response['Content-Type'] or httpwrappers.DEFAULT_MIME_TYPE
if http_response.cookies:
mod_python_req.headers_out['Set-Cookie'] = http_response.cookies.output(header='')
for key, value in http_response.headers.items():
if key != 'Content-Type':
mod_python_req.headers_out[key] = value
mod_python_req.status = http_response.status_code
mod_python_req.write(http_response.get_content_as_string('utf-8'))
def handler(req):
# mod_python hooks into this function.
return ModPythonHandler()(req)