Add in getLastEdited API call

This new HTTP API call, getLastEdited, will return the time of the
last revision, in UNIX timestamp format.

src/node/db/API.js

@@ -282,6 +282,24 @@ exports.getRevisionsCount = function(padID, callback)
   });
 }
 
+/**
+getLastEdited(padID) returns the timestamp of the last revision of the pad
+
+Example returns:
+
+{code: 0, message:"ok", data: {lastEdited: 1340815946602}}
+{code: 1, message:"padID does not exist", data: null}
+*/
+exports.getLastEdited = function(padID, callback)
+{
+  //get the pad
+  getPadSafe(padID, true, function(err, pad)
+  {
+    if(ERR(err, callback)) return;
+    callback(null, {lastEdited: pad.getLastEdited()});
+  });
+}
+
 /**
 createPad(padName [, text]) creates a new pad in this group 
 

src/node/db/Pad.js

@@ -102,6 +102,12 @@ Pad.prototype.saveToDatabase = function saveToDatabase(){
   db.set("pad:"+this.id, dbObject);
 }
 
+// get time of last edit (changeset application)
+Pad.prototype.getLastEdit = function getLastEdit(callback){
+  var revNum = this.getHeadRevisionNumber();
+  db.getSub("pad:"+this.id+":revs:"+revNum, ["meta", "timestamp"], callback);
+}
+
 Pad.prototype.getRevisionChangeset = function getRevisionChangeset(revNum, callback) {
   db.getSub("pad:"+this.id+":revs:"+revNum, ["changeset"], callback);
 };

src/node/handler/APIHandler.js

@@ -57,6 +57,7 @@ var functions = {
   "getHTML"                   : ["padID", "rev"],
   "setHTML"                   : ["padID", "html"],
   "getRevisionsCount"         : ["padID"], 
+  "getLastEdited"             : ["padID"],
   "deletePad"                 : ["padID"], 
   "getReadOnlyID"             : ["padID"],
   "setPublicStatus"           : ["padID", "publicStatus"],