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50 lines
2.0 KiB
Python
50 lines
2.0 KiB
Python
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from django.conf import settings
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from django import http
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from django.core.urlresolvers import resolve
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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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"""
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Rewrite the URL based on settings.SMART_APPEND_SLASH
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"""
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# Check for a redirect based on settings.SMART_APPEND_SLASH
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host = http.get_host(request)
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old_url = [host, request.path]
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new_url = old_url[:]
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# Append a slash if SMART_APPEND_SLASH is set and the resulting URL
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# resolves.
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if settings.SMART_APPEND_SLASH and (not old_url[1].endswith('/')) and not _resolves(old_url[1]) and _resolves(old_url[1] + '/'):
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new_url[1] = new_url[1] + '/'
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if settings.DEBUG and request.method == 'POST':
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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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resolve(url)
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return True
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except http.Http404:
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return False
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