Worker persistence (#2907)

* Fixes ability to set Auth LOCAL persistence explicitly in a worker environment.

Author: bojeil-google

packages/auth/src/authstorage.js

@@ -1,6 +1,6 @@
 /**
  * @license
- * Copyright 2017 Google Inc.
+ * Copyright 2017 Google LLC
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -27,6 +27,7 @@ goog.provide('fireauth.authStorage.Persistence');
 goog.require('fireauth.AuthError');
 goog.require('fireauth.authenum.Error');
 goog.require('fireauth.storage.Factory');
+goog.require('fireauth.storage.IndexedDB');
 goog.require('fireauth.storage.Storage');
 goog.require('fireauth.util');
 goog.require('goog.Promise');
@@ -109,6 +110,15 @@ fireauth.authStorage.validatePersistenceArgument =
         throw unsupportedTypeError;
       }
       break;
+    case fireauth.util.Env.WORKER:
+      // In a worker environment, either LOCAL or NONE are supported.
+      // If indexedDB not supported and LOCAL provided, throw an error.
+      if (arg === fireauth.authStorage.Persistence.SESSION ||
+          (!fireauth.storage.IndexedDB.isAvailable() &&
+           arg !== fireauth.authStorage.Persistence.NONE)) {
+        throw unsupportedTypeError;
+      }
+      break;
     case fireauth.util.Env.BROWSER:
     default:
       // This is restricted by what the browser supports.

packages/auth/test/authstorage_test.js

@@ -1,6 +1,6 @@
 /**
  * @license
- * Copyright 2017 Google Inc.
+ * Copyright 2017 Google LLC
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -135,6 +135,53 @@ function testValidatePersistenceArgument_node() {
   });
 }
 
+function testValidatePersistenceArgument_worker() {
+  // Simulate worker environment.
+  stubs.replace(
+      fireauth.util,
+      'getEnvironment',
+      function() {
+        return fireauth.util.Env.WORKER;
+      });
+  // Simulate indexedDB supported.
+  stubs.replace(
+      fireauth.storage.IndexedDB,
+      'isAvailable',
+      function() {
+        return true;
+      });
+  var unsupportedTypeError = new fireauth.AuthError(
+      fireauth.authenum.Error.UNSUPPORTED_PERSISTENCE);
+  // Session should throw an error.
+  fireauth.common.testHelper.assertErrorEquals(
+      unsupportedTypeError,
+      assertThrows(function() {
+        fireauth.authStorage.validatePersistenceArgument('session');
+      }));
+  // Local should not throw an error when indexedDB is supported.
+  assertNotThrows(function() {
+    fireauth.authStorage.validatePersistenceArgument('local');
+  });
+  // None should be supported.
+  assertNotThrows(function() {
+    fireauth.authStorage.validatePersistenceArgument('none');
+  });
+
+  // Simulate indexedDB not supported.
+  stubs.replace(
+      fireauth.storage.IndexedDB,
+      'isAvailable',
+      function() {
+        return false;
+      });
+  // Local should throw an error when indexedDB not supported.
+  fireauth.common.testHelper.assertErrorEquals(
+      unsupportedTypeError,
+      assertThrows(function() {
+        fireauth.authStorage.validatePersistenceArgument('local');
+      }));
+}
+
 
 function testValidatePersistenceArgument_reactNative() {
   // Simulate React-Native.