couchdb/userdata/_design/podcast_states/validate_doc_update.js

   1 function(newDoc, oldDoc, userCtx)
   2 {
   3     function require(doc, field, message)
   4     {
   5         message = message || "Document must have a " + field;
   6         if (doc[field] == void 0 || doc[field] == null || doc[field].length == 0)
   7         {
   8             throw({forbidden: message});
   9         }
  10     }
  11
  12     if(newDoc.doc_type == "PodcastUserState")
  13     {
  14         require(newDoc, "podcast");
  15
  16         subscribed_devices = [];
  17         last_timestamp = null;
  18
  19         for(n in newDoc.actions)
  20         {
  21             action = newDoc.actions[n];
  22
  23
  24             if((last_timestamp != null) && (action.timestamp < last_timestamp))
  25             {
  26                 throw({forbidden: "The actions in PodcastUserState " + newDoc._id + " must be in order"});
  27             }
  28             last_timestamp = action.timestamp;
  29
  30
  31             index = subscribed_devices.indexOf(action.device);
  32             if(action.action == "subscribe")
  33             {
  34                 if(index > -1)
  35                 {
  36                     throw({forbidden: "Can not subscribe twice on device " + action.device + " in podcast state " + newDoc._id});
  37                 }
  38
  39                 subscribed_devices.push(action.device);
  40             }
  41             else if (action.action == "unsubscribe")
  42             {
  43                 if(index == -1)
  44                 {
  45                     throw({forbidden: "Can not unsubscribe on device " + action.device + " on which the podcast is not subscribed in podcast state " + newDoc._id});
  46                 }
  47
  48                 subscribed_devices.splice(index, 1);
  49             }
  50
  51         }
  52     }
  53 }