refactor(mongo-credentials): support accepting auth from parser

mbroadst · mbroadst · commit d448089744fd · 2019-03-10T14:56:19.000-04:00
The connection parser outputs auth information in a specific format
which the current `MongoCredentials` does not properly parse. This
allows us to pass the output of that parsing directly into the ctor
diff --git a/lib/auth/mongo_credentials.js b/lib/auth/mongo_credentials.js
@@ -45,8 +45,8 @@ class MongoCredentials {
     options = options || {};
     this.username = options.username;
     this.password = options.password;
-    this.source = options.source;
-    this.mechanism = options.mechanism;
+    this.source = options.source || options.db;
+    this.mechanism = options.mechanism || 'default';
     this.mechanismProperties = options.mechanismProperties;
   }
 
