Complete the diff generating functionality.

endpoints/api.py

@@ -1,5 +1,6 @@
 import logging
 import stripe
+import re
 
 from flask import request, make_response, jsonify, abort
 from flask.ext.login import login_required, current_user, logout_user
@@ -7,6 +8,8 @@ from flask.ext.principal import identity_changed, AnonymousIdentity
 from functools import wraps
 from collections import defaultdict
 
+import storage
+
 from data import model
 from app import app
 from util.email import send_confirmation_email, send_recovery_email
@@ -17,8 +20,9 @@ from auth.permissions import (ReadRepositoryPermission,
                               AdministerRepositoryPermission)
 from endpoints import registry
 from endpoints.web import common_login
-import re
 
+
+store = storage.load()
 logger = logging.getLogger(__name__)
 
 
@@ -366,11 +370,13 @@ def list_repository_images(namespace, repository):
 def get_repository_changes(namespace, repository, image_id):
   permission = ReadRepositoryPermission(namespace, repository)
   if permission.can() or model.repository_is_public(namespace, repository):
-    return jsonify({
-      'added': [],
-      'changed': [],
-      'removed': []
-    })
+    diffs_path = store.image_file_diffs_path(namespace, repository, image_id)
+
+    try:
+      response_json = store.get_content(diffs_path)
+      return make_response(response_json)
+    except IOError:
+      abort(404)
 
   abort(403)