POST /:channel/subscribers/:node endpoint created

This API endpoint's purpose is to allow affiliation changes to existing
subscriptions to a given node.

src/subscriptions.js

@@ -39,6 +39,9 @@ exports.setup = function(app) {
   app.get('/:channel/subscribers/:node',
           session.provider,
           getNodeSubscriptions);
+  app.post('/:channel/subscribers/:node',
+          session.provider,
+          changeNodeSubscriptions);
 };
 
 //// GET /subscribed ///////////////////////////////////////////////////////////
@@ -171,3 +174,51 @@ function requestNodeAffiliations(req, res, channel, node, callback) {
   var iq = pubsub.nodeAffiliationsIq(nodeId);
   api.sendQuery(req, res, iq, callback);
 }
+
+//// POST /<channel>/subscribers/<node> //////////////////////////////////////////////////////////
+
+function changeNodeSubscriptions(req, res) {
+  if (!req.user) {
+    api.sendUnauthorized(res);
+    return;
+  }
+
+  var channel = req.params.channel;
+  var node = req.params.node;
+
+  var nodeId = pubsub.channelNodeId(channel, node);
+  var newSubscribedAffiliations = [];
+
+  try {
+
+    var propertyNames = Object.getOwnPropertyNames(req.body);
+    for ( var i=0; i<propertyNames.length; i++ ){
+
+      var key = propertyNames[i];
+      var subscribedChannel = key.split('/', 2)[0];
+      var subscribedNode = key.split('/', 2)[1];
+      var affiliation = body[key];
+
+      if ( affiliation != "member" && affiliation != "publisher" && affiliation != "moderator" && affiliation != "outcast" ){
+        continue;
+      }
+
+      //TODO
+      //Also filter out from newSubscribedAffiliations those channel jids which aren't actually subscribed to this node.
+      //Probably by performing a getNodeSubscriptions and comparing the results with the new affiliation information given by the user
+
+      newSubscribedAffiliations.push({
+        'jid' : pubsub.channelNodeId(subscribedChannel, subscribedNode),
+        'affiliation' : affiliation
+      });
+    }
+
+  } catch (e) {
+    res.send(400);
+  }
+
+  api.sendQuery(req, res, pubsub.changeNodeAffiliationsIq(nodeId, newSubscribedAffiliations), function(){
+    res.send(200);
+  });
+
+}

src/util/pubsub.js

@@ -131,6 +131,23 @@ exports.nodeAffiliationsIq = function(nodeId, item) {
     root();
 };
 
+/**
+ * Creates a Pub-Sub <affiliations/> IQ with multiple <affiliation> tags,
+ * each composed by a jid of a subscribing channel and its new type of affiliation.
+ * The <subscribedJIDAndAffiliation> parameter must be an array of entries in the format:
+ * {'jid' : 'jid_val', 'affiliation' : 'affiliation_type'}
+ */
+exports.changeNodeAffiliationsIq = function(nodeId, subscribedJIDAndAffiliation) {
+  var iqBody = iq({type : 'set'}, exports.ownerNS).
+	  c('affiliations', {node: nodeId});
+
+  for ( var i=0; i<subscribedJIDAndAffiliation.length; i++ ){
+    iqBody.c('affiliation', subscribedJIDAndAffiliation[i]);
+  }
+
+  return iqBody.root();
+};
+
 /**
  * Creates a Pub-Sub <subscribe/> IQ, which subscribes to a node.
  */