add fallback for using metadata fallback

lib/cartodb/api/auth_api.js

@@ -1,3 +1,5 @@
+var _ = require('underscore'); // AUTH_FALLBACK
+
 /**
  *
  * @param {PgConnection} pgConnection
@@ -45,10 +47,10 @@ AuthApi.prototype.authorizedBySigner = function(res, callback) {
 };
 
 function isValidApiKey(apikey) {
-    return apikey.type !== null &&
-        apikey.user !== null &&
-        apikey.databasePassword !== null &&
-        apikey.databaseRole !== null;
+    return apikey.type &&
+        apikey.user &&
+        apikey.databasePassword &&
+        apikey.databaseRole;
 }
 
 // Check if a request is authorized by api_key
@@ -72,6 +74,19 @@ AuthApi.prototype.authorizedByAPIKey = function(user, req, callback) {
         if (err) {
             return callback(err);
         }
+
+        //Remove this block when Auth fallback is not used anymore
+        // AUTH_FALLBACK
+        if (!apikey.databaseRole && apikey.user_id && global.environment.postgres_auth_user) {
+            apikey.databaseRole = _.template(global.environment.postgres_auth_user, apikey);
+        }
+
+        //Remove this block when Auth fallback is not used anymore
+        // AUTH_FALLBACK
+        if (!apikey.databasePassword && global.environment.postgres.password) {
+            apikey.databasePassword = global.environment.postgres.password;
+        }
+
         if ( !isValidApiKey(apikey)) {
             const error = new Error('Unauthorized');
             error.type = 'auth';