Add check_permissions replacement

Add a new class method named check_user_permission.
This method is smaller as it only accepts a single permission
instead of a single or a list of permission like check_permissions
does. check_user_permission is meant to replace check_permissions.

Signed-off-by: Roberto Rosario <Roberto.Rosario@mayan-edms.com>

mayan/apps/permissions/classes.py

@@ -72,15 +72,16 @@ class Permission(object):
                 cls._permissions.values(), key=lambda x: x.namespace.name
             )
 
+    # Deprecated method
     @classmethod
-    def check_permissions(cls, requester, permissions):
+    def check_permissions(cls, permissions, requester):
         try:
             for permission in permissions:
-                if permission.stored_permission.requester_has_this(requester):
+                if permission.stored_permission.user_has_this(user=requester):
                     return True
         except TypeError:
             # Not a list of permissions, just one
-            if permissions.stored_permission.requester_has_this(requester):
+            if permissions.stored_permission.user_has_this(user=requester):
                 return True
 
         logger.debug(
@@ -88,6 +89,13 @@ class Permission(object):
         )
         raise PermissionDenied(_('Insufficient permissions.'))
 
+    @classmethod
+    def check_user_permission(cls, permission, user):
+        if permission.stored_permission.user_has_this(user=user):
+            return True
+
+        raise PermissionDenied(_('Insufficient permissions.'))
+
     @classmethod
     def get(cls, pk, proxy_only=False):
         if proxy_only: