From ca1df94be55f321b581a6384679ff50bcb15346e Mon Sep 17 00:00:00 2001
From: Philip Sargent <philip.sargent@klebos.com>
Date: Tue, 13 Apr 2021 00:14:15 +0100
Subject: moved clever slash middleware & unused.py

---
 core/middleware.py | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 core/middleware.py

(limited to 'core/middleware.py')

diff --git a/core/middleware.py b/core/middleware.py
new file mode 100644
index 0000000..56078a9
--- /dev/null
+++ b/core/middleware.py
@@ -0,0 +1,68 @@
+from django.conf import settings
+from django import http
+from django.urls import reverse, resolve,Resolver404
+"""Non-standard django middleware is loaded from this file.
+"""
+
+class SmartAppendSlashMiddleware(object):
+    """
+    "SmartAppendSlash" middleware for taking care of URL rewriting.
+
+    This middleware appends a missing slash, if:
+    * the SMART_APPEND_SLASH setting is True
+    * the URL without the slash does not exist
+    * the URL with an appended slash does exist.
+    Otherwise it won't touch the URL.
+    """
+
+    def process_request(self, request):
+        '''Called for every url so return as quickly as possible
+        Append a slash if SMART_APPEND_SLASH is set, the resulting URL resolves and it doesn't without the /
+        '''
+        if not settings.SMART_APPEND_SLASH:
+            return None
+ 
+        if request.path.endswith('/'):
+            return None
+            
+        if request.path.endswith('_edit'):
+            return None
+
+        host = http.HttpRequest.get_host(request)
+        old_url = [host, request.path]
+        if _resolves(old_url[1]):
+            return None
+         
+        # So: it does not resolve according to our criteria, i.e. _edit doesn't count
+        new_url = old_url[:]       
+        new_url[1] = new_url[1] + '/'
+        if not _resolves(new_url[1]):
+            return None
+        else:          
+            if settings.DEBUG and request.method == 'POST':
+                # replace this exception with a redirect to an error page
+                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]))
+        if new_url != old_url:
+            # Redirect
+            if new_url[0]:
+                newurl = "%s://%s%s" % (request.is_secure() and 'https' or 'http', new_url[0], new_url[1])
+            else:
+                newurl = new_url[1]
+            if request.GET:
+                newurl += '?' + request.GET.urlencode()
+            return http.HttpResponsePermanentRedirect(newurl)
+
+        return None
+
+def _resolves(url):
+    try:
+        # If the URL does not resolve, the function raises a Resolver404 exception (a subclass of Http404) 
+        match = resolve(url)
+        # this will ALWAYS be resolved by expopages because it will produce pagenotfound if not the thing asked for
+        # so handle this in expopages, not in middleware 
+        return True
+    except Resolver404:
+        return False
+    except:
+        print(url)
+        raise
-- 
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