groups.create() now needs source argument

src/groups.js

@@ -46,8 +46,17 @@ function validateGroupname(name) {
     return null;
 }
 
-function create(name, callback) {
+function validateGroupSource(source) {
+    assert.strictEqual(typeof source, 'string');
+
+    if (source !== '' && source !== 'ldap') return new BoxError(BoxError.BAD_FIELD, 'source must be "" or "ldap"', { field: source });
+
+    return null;
+}
+
+function create(name, source, callback) {
     assert.strictEqual(typeof name, 'string');
+    assert.strictEqual(typeof source, 'string');
     assert.strictEqual(typeof callback, 'function');
 
     // we store names in lowercase
@@ -56,8 +65,10 @@ function create(name, callback) {
     var error = validateGroupname(name);
     if (error) return callback(error);
 
+    error = validateGroupSource(source);
+    if (error) return callback(error);
+
     var id = 'gid-' + uuid.v4();
-    var source = ''; // empty means local
     groupdb.add(id, name, source, function (error) {
         if (error) return callback(error);