Initial whitelist/blacklist support

apps/sources/utils.py

@@ -0,0 +1,37 @@
+import re
+
+from django.core.exceptions import ValidationError
+from django.utils.translation import ugettext
+
+# From http://www.peterbe.com/plog/whitelist-blacklist-logic
+def accept_item(value, whitelist, blacklist, default_accept=True): 
+    """ return true if this item is either whitelisted or  
+    not blacklisted """ 
+    if not whitelist:
+        whitelist = []
+        
+    if not blacklist:
+        blacklist = []
+
+    # note the order  
+    for reject, item_list in ([False, whitelist], [True, blacklist]): 
+        print 'item_list: %s' % item_list
+        print 'reject: %s' % reject
+        for okpattern in item_list: 
+            print 'okpattern: %s' % okpattern
+            if re.findall(okpattern.replace('*','\S+'), value, re.I): 
+                # match! 
+                print 'MATCH'
+                if reject: 
+                    return False 
+                else: 
+                    return True
+
+    # default is to accept all 
+    return default_accept
+
+
+def validate_whitelist_blacklist(value, whitelist, blacklist):
+    print 'blacklist', blacklist
+    if not accept_item(value, whitelist, blacklist):
+        raise ValidationError(ugettext(u'Whitelist Blacklist validation error.'))