add permissions backend

issue/backends.py

@@ -0,0 +1,27 @@
+from django.contrib.auth.backends import ModelBackend
+
+from issue.models import *
+
+
+def user_has_perm(user, perm, perms):
+    for p in perms:
+        # this permission allow that action and the user is concerned by this permission
+        if hasattr(p, perm) and getattr(p, perm) and p.granted_to(user):
+            return True
+
+class ProjectBackend(ModelBackend):
+
+    def has_perm(self, user, perm, obj=None):
+
+        if isinstance(obj, Project):
+            # get permissions concerning this project
+            perms = obj.permissions.all()
+            if user_has_perm(user, perm, perms):
+                return True
+
+        # get global permissions
+        perms = GlobalPermission.objects.all()
+        if user_has_perm(user, perm, perms):
+            return True
+
+        return False

ponytracker/settings.py

@@ -111,4 +111,9 @@ TEMPLATE_CONTEXT_PROCESSORS = (
     'issue.context_processors.projects',
 )
 
+AUTHENTICATION_BACKENDS = (
+    'django.contrib.auth.backends.ModelBackend',
+    'issue.backends.ProjectBackend',
+)
+
 SITE_ID = 1