Add method 'createItem' to DB plugins

js/plugins/EncryptedInsightStorage.js

@@ -11,6 +11,9 @@ EncryptedInsightStorage.prototype.getItem = function(name, callback) {
   var key = cryptoUtil.kdfbinary(this.password + this.email);
   InsightStorage.prototype.getItem.apply(this, [name,
     function(err, body) {
+      if (err) {
+        return callback(err);
+      }
       var decryptedJson = cryptoUtil.decrypt(key, body);
       if (!decryptedJson) {
         return callback('Internal Error');

js/plugins/GoogleDrive.js

@@ -95,6 +95,16 @@ GoogleDrive.prototype._httpGet = function(theUrl) {
   return xmlHttp.responseText;
 }
 
+GoogleDrive.prototype.createItem = function(name, value, callback) {
+  this.getItem(name, function(err, retrieved) {
+    if (err || !retrieved) {
+      return this.setItem(name, value, callback);
+    } else {
+      return callback('EEXISTS');
+    }
+  });
+};
+
 GoogleDrive.prototype.getItem = function(k, cb) {
   //console.log('[googleDrive.js.95:getItem:]', k); //TODO
   var self = this;

js/plugins/InsightStorage.js

@@ -16,6 +16,17 @@ InsightStorage.prototype.setCredentials = function(email, password, opts) {
   this.password = password;
 };
 
+InsightStorage.prototype.createItem = function(name, value, callback) {
+  var self = this;
+  this.getItem(name, function(err, retrieved) {
+    if (err || !retrieved) {
+      return self.setItem(name, value, callback);
+    } else {
+      return callback('EEXISTS');
+    }
+  });
+};
+
 InsightStorage.prototype.getItem = function(name, callback) {
   var key = cryptoUtil.kdf(this.password + this.email);
   var secret = cryptoUtil.kdf(key, this.password);

js/plugins/LocalStorage.js

@@ -16,6 +16,16 @@ LocalStorage.prototype.getItem = function(k,cb) {
   return cb(null, localStorage.getItem(k));
 };
 
+/**
+ * Same as setItem, but fails if an item already exists
+ */
+LocalStorage.prototype.createItem = function(name, value, callback) {
+  if (localStorage.getItem(name)) {
+    return callback('EEXISTS');
+  }
+  return this.setItem(name, value, callback);
+};
+
 LocalStorage.prototype.setItem = function(k,v,cb) {
   localStorage.setItem(k,v);
   return cb();