forked from expo/troggle
70 lines
2.7 KiB
Python
70 lines
2.7 KiB
Python
from django.conf import settings
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from django import http
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from django.urls import reverse, resolve,Resolver404
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"""Non-standard django middleware is loaded from this file.
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It needs re-writing to be compatible with Django v2.0+
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"""
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class SmartAppendSlashMiddleware(object):
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"""
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"SmartAppendSlash" middleware for taking care of URL rewriting.
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This middleware appends a missing slash, if:
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* the SMART_APPEND_SLASH setting is True
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* the URL without the slash does not exist
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* the URL with an appended slash does exist.
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Otherwise it won't touch the URL.
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"""
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def process_request(self, request):
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'''Called for every url so return as quickly as possible
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Append a slash if SMART_APPEND_SLASH is set, the resulting URL resolves and it doesn't without the /
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'''
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if not settings.SMART_APPEND_SLASH:
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return None
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if request.path.endswith('/'):
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return None
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if request.path.endswith('_edit'):
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return None
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host = http.HttpRequest.get_host(request)
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old_url = [host, request.path]
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if _resolves(old_url[1]):
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return None
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# So: it does not resolve according to our criteria, i.e. _edit doesn't count
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new_url = old_url[:]
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new_url[1] = new_url[1] + '/'
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if not _resolves(new_url[1]):
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return None
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else:
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if settings.DEBUG and request.method == 'POST':
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# replace this exception with a redirect to an error page
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raise RuntimeError("You called this URL via POST, but the URL doesn't end in a slash and you have SMART_APPEND_SLASH set. Django can't redirect to the slash URL while maintaining POST data. Change your form to point to %s%s (note the trailing slash), or set SMART_APPEND_SLASH=False in your Django settings." % (new_url[0], new_url[1]))
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if new_url != old_url:
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# Redirect
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if new_url[0]:
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newurl = "%s://%s%s" % (request.is_secure() and 'https' or 'http', new_url[0], new_url[1])
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else:
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newurl = new_url[1]
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if request.GET:
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newurl += '?' + request.GET.urlencode()
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return http.HttpResponsePermanentRedirect(newurl)
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return None
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def _resolves(url):
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try:
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# If the URL does not resolve, the function raises a Resolver404 exception (a subclass of Http404)
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match = resolve(url)
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# this will ALWAYS be resolved by expopages because it will produce pagenotfound if not the thing asked for
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# so handle this in expopages, not in middleware
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return True
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except Resolver404:
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return False
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except:
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print(url)
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raise
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