From 88b3f3099252353e22c536a68e15e2a2f9b10334 Mon Sep 17 00:00:00 2001
From: mike <michael.jmontcalm@gmail.com>
Date: Thu, 19 Nov 2009 14:38:39 +0000
Subject: LP 448319 : Addition of resource properties, insertion of BubbleMessageWImg from Dave, modification of Engine to get action_addresses

---
(limited to 'tutorius/constraints.py')

diff --git a/tutorius/constraints.py b/tutorius/constraints.py
index 519bce8..cd71167 100644
--- a/tutorius/constraints.py
+++ b/tutorius/constraints.py
@@ -24,6 +24,8 @@ for some properties.
 
 # For the File Constraint
 import os
+# For the Resource Constraint
+import re
 
 class ConstraintException(Exception):
     """
@@ -214,3 +216,40 @@ class FileConstraint(Constraint):
             raise FileConstraintError("Non-existing file : %s"%value)
         return
     
+class ResourceConstraintError(ConstraintException):
+    pass
+
+class ResourceConstraint(Constraint):
+    """
+    Ensures that the value is looking like a resource name, like
+    <filename>_<GUID>[.<extension>]. We are not validating that this is a
+    valid resource for the reason that the property does not have any notion
+    of tutorial guid.
+
+    TODO : Find a way to properly validate resources by looking them up in the
+            Vault.
+    """
+    
+    # Regular expression to parse a resource-like name
+    resource_regexp_text = "(.+)_([a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12})(\..*)?$"
+    resource_regexp = re.compile(resource_regexp_text)
+    
+    def validate(self, value):
+        # TODO : Validate that we will not use an empty resource or if we can
+        # have transitory resource names
+        if value is None:
+            raise ResourceConstraintError("Resource not allowed to have a null value!")
+
+        # Special case : We allow the empty resource name for now
+        if value == "":
+            return value
+
+        # Attempt to see if the value has a resource name inside it
+        match = self.resource_regexp.search(value)
+
+        # If there was no match on the reg exp
+        if not match:
+            raise ResourceConstraintError("Resource name does not seem to be valid : %s" % value)
+
+        # If the name matched, then the value is _PROBABLY_ good
+        return value
--
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