133 lines
4.9 KiB
Python
133 lines
4.9 KiB
Python
from django.conf import settings
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from django.core.exceptions import PermissionDenied
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from django.http import HttpResponsePermanentRedirect
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from django.urls import is_valid_path
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from django.utils.deprecation import MiddlewareMixin
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from django.utils.http import escape_leading_slashes
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class UnCommonMiddleware(MiddlewareMixin):
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"""
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Lol, common
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"""
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response_redirect_class = HttpResponsePermanentRedirect
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def process_request(self, request):
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"""
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Check for denied User-Agents and rewrite the URL based on
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settings.APPEND_SLASH and settings.PREPEND_WWW
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"""
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# Check for denied User-Agents
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user_agent = request.META.get('HTTP_USER_AGENT')
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if user_agent is not None:
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for user_agent_regex in settings.DISALLOWED_USER_AGENTS:
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if user_agent_regex.search(user_agent):
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raise PermissionDenied('Forbidden user agent')
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# Check for a redirect based on settings.PREPEND_WWW
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host = request.get_host()
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must_prepend = settings.PREPEND_WWW and host and not host.startswith('www.')
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redirect_url = ('%s://www.%s' % (request.scheme, host)) if must_prepend else ''
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# Check if a slash should be appended or removed
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if self.should_redirect_with_slash(request):
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path = self.get_full_path_with_slash(request)
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elif self.should_redirect_without_slash(request):
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path = self.get_full_path_without_slash(request)
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else:
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path = request.get_full_path()
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# Return a redirect if necessary
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if redirect_url or path != request.get_full_path():
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redirect_url += path
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return self.response_redirect_class(redirect_url)
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def should_redirect_with_slash(self, request):
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"""
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Return True if settings.APPEND_SLASH is True and appending a slash to
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the request path turns an invalid path into a valid one.
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"""
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if settings.APPEND_SLASH and not request.path_info.endswith('/'):
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urlconf = getattr(request, 'urlconf', None)
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if not is_valid_path(request.path_info, urlconf):
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match = is_valid_path('%s/' % request.path_info, urlconf)
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if match:
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view = match.func
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return getattr(view, 'should_append_slash', True)
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return False
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def get_full_path_with_slash(self, request):
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"""
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Return the full path of the request with a trailing slash appended.
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Raise a RuntimeError if settings.DEBUG is True and request.method is
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POST, PUT, or PATCH.
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"""
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new_path = request.get_full_path(force_append_slash=True)
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# Prevent construction of scheme relative urls.
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new_path = escape_leading_slashes(new_path)
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if settings.DEBUG and request.method in ('POST', 'PUT', 'PATCH'):
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raise RuntimeError(
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"You called this URL via %(method)s, but the URL doesn't end "
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"in a slash and you have APPEND_SLASH set. Django can't "
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"redirect to the slash URL while maintaining %(method)s data. "
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"Change your form to point to %(url)s (note the trailing "
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"slash), or set APPEND_SLASH=False in your Django settings." % {
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'method': request.method,
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'url': request.get_host() + new_path,
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}
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)
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return new_path
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def should_redirect_without_slash(self, request):
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"""
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Removing slashes, of course
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"""
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if settings.REMOVE_SLASH and request.path_info.endswith('/'):
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urlconf = getattr(request, 'urlconf', None)
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if not is_valid_path(request.path_info, urlconf):
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match = is_valid_path('%s' % request.path_info[:-1], urlconf)
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if match:
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view = match.func
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return getattr(view, 'should_remove_slash', True)
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return False
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def get_full_path_without_slash(self, request):
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"""
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z
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"""
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new_path = request.get_full_path(force_append_slash=True)[:-1]
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# Prevent construction of scheme relative urls.
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new_path = escape_leading_slashes(new_path)
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if settings.DEBUG and request.method in ('POST', 'PUT', 'PATCH'):
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raise RuntimeError(
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"You called this URL via %(method)s, but the URL doesn't end "
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"in a slash and you have APPEND_SLASH set. Django can't "
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"redirect to the slash URL while maintaining %(method)s data. "
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"Change your form to point to %(url)s (note the trailing "
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"slash), or set APPEND_SLASH=False in your Django settings." % {
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'method': request.method,
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'url': request.get_host() + new_path,
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}
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)
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return new_path
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def process_response(self, request, response):
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"""
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When the status code of the response is 404, it may redirect to a path
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with an appended slash if should_redirect_with_slash() returns True.
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"""
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# If the given URL is "Not Found", then check if we should redirect to
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# a path with a slash appended.
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if response.status_code == 404 and self.should_redirect_with_slash(request):
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return self.response_redirect_class(self.get_full_path_with_slash(request))
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if response.status_code == 404 and self.should_redirect_without_slash(request):
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return self.response_redirect_class(self.get_full_path_without_slash(request))
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# Add the Content-Length header to non-streaming responses if not
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# already set.
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if not response.streaming and not response.has_header('Content-Length'):
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response.headers['Content-Length'] = str(len(response.content))
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return response |