From 4706b02d7b5f22c88fe70b470ee24bcbea26efa9 Mon Sep 17 00:00:00 2001
From: Alexander Rhodes <ironsizide@787980.no-reply.drupal.org>
Date: Wed, 8 Mar 2017 12:29:08 -0500
Subject: [PATCH] Unravels the inheritance problems in encrypted version of
 RestClient

Normalizes RestClientInterface injection in DeleteHandler and QueueHandler
All unit tests passing
---
 .../src/Rest/EncryptedRestClientInterface.php |  27 +-
 .../src/Rest/RestClient.php                   |  15 +-
 .../tests/src/Unit/RestClientTest.php         |   5 +-
 modules/salesforce_pull/src/DeleteHandler.php |  10 +-
 modules/salesforce_pull/src/QueueHandler.php  |   8 +-
 .../tests/src/Unit/DeleteHandlerTest.php      |  51 +-
 src/Rest/RestClient.php                       |   6 +-
 src/Rest/RestClientBase.php                   | 856 ++++++++++++++++++
 src/Rest/RestClientBaseInterface.php          | 408 +++++++++
 src/Rest/RestClientInterface.php              | 395 +-------
 tests/src/Unit/RestClientTest.php             |   2 +-
 11 files changed, 1343 insertions(+), 440 deletions(-)
 create mode 100644 src/Rest/RestClientBase.php
 create mode 100644 src/Rest/RestClientBaseInterface.php

diff --git a/modules/salesforce_encrypt/src/Rest/EncryptedRestClientInterface.php b/modules/salesforce_encrypt/src/Rest/EncryptedRestClientInterface.php
index 7af05417..931419cd 100644
--- a/modules/salesforce_encrypt/src/Rest/EncryptedRestClientInterface.php
+++ b/modules/salesforce_encrypt/src/Rest/EncryptedRestClientInterface.php
@@ -2,16 +2,37 @@
 
 namespace Drupal\salesforce_encrypt\Rest;
 
-use Drupal\salesforce\Rest\RestClientInterface;
+use Drupal\salesforce\Rest\RestClientBaseInterface;
 use Drupal\encrypt\Entity\EncryptionProfile;
 use Drupal\encrypt\EncryptServiceInterface;
 use Drupal\encrypt\EncryptionProfileManagerInterface;
 use Drupal\encrypt\EncryptionProfileInterface;
+use Drupal\Core\Lock\LockBackendInterface;
+use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\State\StateInterface;
+use GuzzleHttp\ClientInterface;
 
 /**
  * Objects, properties, and methods to communicate with the Salesforce REST API.
  */
-interface EncryptedRestClientInterface extends RestClientInterface {
+interface EncryptedRestClientInterface extends RestClientBaseInterface {
+
+  /**
+   * Constructor which initializes the consumer.
+   *
+   * @param \GuzzleHttp\ClientInterface $http_client
+   *   The GuzzleHttp Client.
+   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
+   *   The config factory service.
+   * @param \Drupal\Core\State\StateInterface $state
+   *   The state service.
+   * @param \Drupal\Core\Cache\CacheBackendInterface $cache
+   *   The cache service.
+   * @param \Drupal\Component\Serialization\Json $json
+   *   The JSON serializer service.
+   */
+  public function __construct(ClientInterface $http_client, ConfigFactoryInterface $config_factory, StateInterface $state, CacheBackendInterface $cache, EncryptServiceInterface $encryption, EncryptionProfileManagerInterface $encryptionProfileManager, LockBackendInterface $lock);
 
   /**
    * Encrypts all sensitive salesforce config values.
@@ -49,7 +70,7 @@ interface EncryptedRestClientInterface extends RestClientInterface {
    * it gets deleted. Check to see if the  profile being deleted is the one
    * assigned for encryption; if so, decrypt our config and disable encryption.
    *
-   * @param EncryptionProfileInterface $profile 
+   * @param EncryptionProfileInterface $profile
    */
   public function hookEncryptionProfileDelete(EncryptionProfileInterface $profile);
 
diff --git a/modules/salesforce_encrypt/src/Rest/RestClient.php b/modules/salesforce_encrypt/src/Rest/RestClient.php
index 79fdfa6e..399136d9 100644
--- a/modules/salesforce_encrypt/src/Rest/RestClient.php
+++ b/modules/salesforce_encrypt/src/Rest/RestClient.php
@@ -13,13 +13,14 @@ use Drupal\encrypt\EncryptServiceInterface;
 use Drupal\encrypt\EncryptionProfileInterface;
 use Drupal\encrypt\EncryptionProfileManagerInterface;
 use Drupal\salesforce\EntityNotFoundException;
-use Drupal\salesforce\Rest\RestClient as SalesforceRestClient;
+use Drupal\salesforce\Rest\RestClientBase;
 use GuzzleHttp\ClientInterface;
+use Drupal\salesforce_encrypt\Rest\EncryptedRestClientInterface;
 
 /**
  * Objects, properties, and methods to communicate with the Salesforce REST API.
  */
-class RestClient extends SalesforceRestClient implements EncryptedRestClientInterface {
+class RestClient extends RestClientBase implements EncryptedRestClientInterface {
 
   use StringTranslationTrait;
 
@@ -30,14 +31,18 @@ class RestClient extends SalesforceRestClient implements EncryptedRestClientInte
   /**
    * Constructor which initializes the consumer.
    *
-   * @param \Drupal\Core\Http\Client $http_client
+   * @param \GuzzleHttp\ClientInterface $http_client
    *   The config factory.
    * @param \Guzzle\Http\ClientInterface $http_client
    *   The config factory.
    */
   public function __construct(ClientInterface $http_client, ConfigFactoryInterface $config_factory, StateInterface $state, CacheBackendInterface $cache, EncryptServiceInterface $encryption, EncryptionProfileManagerInterface $encryptionProfileManager, LockBackendInterface $lock) {
-    parent::__construct($http_client, $config_factory, $state, $cache);
+    $this->configFactory = $config_factory;
+    $this->httpClient = $http_client;
+    $this->config = $this->configFactory->get('salesforce.settings');
+    $this->configEditable = $this->configFactory->getEditable('salesforce.settings');
     $this->state = $state;
+    $this->cache = $cache;
     $this->encryption = $encryption;
     $this->encryptionProfileId = $state->get('salesforce_encrypt.profile');
     $this->encryptionProfileManager = $encryptionProfileManager;
@@ -95,7 +100,7 @@ class RestClient extends SalesforceRestClient implements EncryptedRestClientInte
     $this->setConsumerKey($consumerKey);
     $this->setConsumerSecret($consumerSecret);
 
-    $this->lock->release('salesforce_encrypt');    
+    $this->lock->release('salesforce_encrypt');
   }
 
   public function getEncryptionProfile() {
diff --git a/modules/salesforce_encrypt/tests/src/Unit/RestClientTest.php b/modules/salesforce_encrypt/tests/src/Unit/RestClientTest.php
index 9ca90166..7919b8c7 100644
--- a/modules/salesforce_encrypt/tests/src/Unit/RestClientTest.php
+++ b/modules/salesforce_encrypt/tests/src/Unit/RestClientTest.php
@@ -17,7 +17,6 @@ use Drupal\encrypt\EncryptionProfileInterface;
  * @coversDefaultClass \Drupal\salesforce_encrypt\Rest\RestClient
  * @group salesforce
  */
-
 class RestClientTest extends UnitTestCase {
 
   static $modules = ['key', 'encrypt', 'salesforce', 'salesforce_encrypt'];
@@ -27,9 +26,9 @@ class RestClientTest extends UnitTestCase {
     $this->accessToken = 'foo';
     $this->refreshToken = 'bar';
     $this->identity = array('zee' => 'bang');
-    
+
     $this->httpClient = $this->getMock(Client::CLASS);
-    $this->configFactory = 
+    $this->configFactory =
       $this->getMockBuilder(ConfigFactory::CLASS)
         ->disableOriginalConstructor()
         ->getMock();
diff --git a/modules/salesforce_pull/src/DeleteHandler.php b/modules/salesforce_pull/src/DeleteHandler.php
index 593a1196..4b3fd44c 100644
--- a/modules/salesforce_pull/src/DeleteHandler.php
+++ b/modules/salesforce_pull/src/DeleteHandler.php
@@ -5,7 +5,7 @@ namespace Drupal\salesforce_pull;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Drupal\Core\State\StateInterface;
 use Drupal\Core\Utility\Error;
-use Drupal\salesforce\Rest\RestClient;
+use Drupal\salesforce\Rest\RestClientInterface;
 use Drupal\salesforce\SFID;
 use Drupal\salesforce_mapping\MappedObjectStorage;
 use Drupal\salesforce_mapping\MappingConstants;
@@ -23,7 +23,7 @@ class DeleteHandler {
   /**
    * Rest client service.
    *
-   * @var \Drupal\salesforce\Rest\RestClient
+   * @var \Drupal\salesforce\Rest\RestClientInterface
    */
   protected $sfapi;
 
@@ -72,7 +72,7 @@ class DeleteHandler {
   /**
    * Constructor.
    *
-   * @param \Drupal\salesforce\Rest\RestClient $sfapi
+   * @param \Drupal\salesforce\Rest\RestClientInterface $sfapi
    *   RestClient object.
    * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
    *   Entity Manager service.
@@ -81,7 +81,7 @@ class DeleteHandler {
    * @param Psr\Log\LoggerInterface $logger
    *   Logging service.
    */
-  private function __construct(RestClient $sfapi, EntityTypeManagerInterface $entity_type_manager, StateInterface $state, LoggerInterface $logger, Request $request) {
+  private function __construct(RestClientInterface $sfapi, EntityTypeManagerInterface $entity_type_manager, StateInterface $state, LoggerInterface $logger, Request $request) {
     $this->sfapi = $sfapi;
     $this->etm = $entity_type_manager;
     $this->mappingStorage = $this->etm->getStorage('salesforce_mapping');
@@ -94,7 +94,7 @@ class DeleteHandler {
   /**
    * Chainable instantiation method for class.
    *
-   * @param \Drupal\salesforce\Rest\RestClient $sfapi
+   * @param \Drupal\salesforce\Rest\RestClientInterface $sfapi
    *   RestClient object.
    * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
    *   Entity Manager service.
diff --git a/modules/salesforce_pull/src/QueueHandler.php b/modules/salesforce_pull/src/QueueHandler.php
index 7cb6fd64..a3b8141e 100644
--- a/modules/salesforce_pull/src/QueueHandler.php
+++ b/modules/salesforce_pull/src/QueueHandler.php
@@ -26,7 +26,7 @@ use Symfony\Component\HttpFoundation\Request;
 class QueueHandler {
 
   /**
-   * @var \Drupal\salesforce\Rest\RestClient
+   * @var \Drupal\salesforce\Rest\RestClientInterface
    */
   protected $sfapi;
 
@@ -61,7 +61,7 @@ class QueueHandler {
   protected $request;
 
   /**
-   * @param RestClient               $sfapi
+   * @param RestClientInterface               $sfapi
    * @param array                    $mappings
    * @param QueueInterface           $queue
    * @param StateInterface           $state
@@ -69,7 +69,7 @@ class QueueHandler {
    * @param EventDispatcherInterface $event_dispatcher
    * @param Request                  $request
    */
-  public function __construct(RestClient $sfapi, array $mappings, QueueInterface $queue, StateInterface $state, LoggerInterface $logger, EventDispatcherInterface $event_dispatcher, Request $request) {
+  public function __construct(RestClientInterface $sfapi, array $mappings, QueueInterface $queue, StateInterface $state, LoggerInterface $logger, EventDispatcherInterface $event_dispatcher, Request $request) {
     $this->sfapi = $sfapi;
     $this->queue = $queue;
     $this->state = $state;
@@ -84,7 +84,7 @@ class QueueHandler {
   /**
    * Chainable instantiation method for class
    *
-   * @param  RestClient               $sfapi
+   * @param  RestClientInterface               $sfapi
    * @param  array                    $mappings
    * @param  QueueInterface           $queue
    * @param  StateInterface           $state
diff --git a/modules/salesforce_pull/tests/src/Unit/DeleteHandlerTest.php b/modules/salesforce_pull/tests/src/Unit/DeleteHandlerTest.php
index 0070dde4..96db0d63 100644
--- a/modules/salesforce_pull/tests/src/Unit/DeleteHandlerTest.php
+++ b/modules/salesforce_pull/tests/src/Unit/DeleteHandlerTest.php
@@ -4,7 +4,6 @@ namespace Drupal\Tests\salesforce_pull\Unit;
 use Drupal\Core\Entity\Entity;
 use Drupal\Core\Entity\EntityStorageBase;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
-use Drupal\Core\Queue\QueueInterface;
 use Drupal\Core\State\StateInterface;
 use Drupal\salesforce_mapping\Entity\MappedObjectInterface;
 use Drupal\salesforce_mapping\Entity\SalesforceMappingInterface;
@@ -13,8 +12,6 @@ use Drupal\salesforce_mapping\MappingConstants;
 use Drupal\salesforce_mapping\SalesforceMappingStorage;
 use Drupal\salesforce_pull\DeleteHandler;
 use Drupal\salesforce\Rest\RestClientInterface;
-use Drupal\salesforce\SelectQueryResult;
-use Drupal\salesforce\SObject;
 use Drupal\Tests\UnitTestCase;
 use Prophecy\Argument;
 use Psr\Log\LoggerInterface;
@@ -22,13 +19,12 @@ use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\ServerBag;
 
 /**
- * Test Object instantitation
+ * Test Object instantitation.
  *
  * @group salesforce_pull
  */
-
 class DeleteHandlerTest extends UnitTestCase {
-  static $modules = ['salesforce_pull'];
+  protected static $modules = ['salesforce_pull'];
 
   /**
    * {@inheritdoc}
@@ -37,7 +33,7 @@ class DeleteHandlerTest extends UnitTestCase {
     parent::setUp();
     $result = [
       'totalSize' => 1,
-      'done' => true,
+      'done' => TRUE,
       'deletedRecords' => [
         [
           'id' => '1234567890abcde',
@@ -48,19 +44,17 @@ class DeleteHandlerTest extends UnitTestCase {
     ];
 
     $prophecy = $this->prophesize(RestClientInterface::CLASS);
-    $prophecy->getDeleted(Argument::any(),Argument::any(),Argument::any())
-      ->willReturn($result); // revisit
+    $prophecy->getDeleted(Argument::any(), Argument::any(), Argument::any())
+      ->willReturn($result);
     $this->sfapi = $prophecy->reveal();
 
-    // mock Drupal entity
+    // Mock Drupal entity.
     $prophecy = $this->prophesize(Entity::CLASS);
-    $prophecy->delete()->willReturn(true);
+    $prophecy->delete()->willReturn(TRUE);
     $prophecy->id()->willReturn(1);
     $this->entity = $prophecy->reveal();
 
     $this->mapping = $this->getMock(SalesforceMappingInterface::CLASS);
-      // ->setMethods(['__get', 'getSalesforceObjectType', 'getPullFieldsArray', 'checkTriggers'])
-      // ->getMock();
     $this->mapping->expects($this->any())
       ->method('__get')
       ->with($this->equalTo('id'))
@@ -78,9 +72,9 @@ class DeleteHandlerTest extends UnitTestCase {
     $this->mapping->expects($this->any())
       ->method('checkTriggers')
       ->with([MappingConstants::SALESFORCE_MAPPING_SYNC_SF_DELETE])
-      ->willReturn(true);
+      ->willReturn(TRUE);
 
-    // mock mapped object
+    // Mock mapped object.
     $this->entityTypeId = new \stdClass();
     $this->entityId = new \stdClass();
     $this->entityRef = new \stdClass();
@@ -92,7 +86,7 @@ class DeleteHandlerTest extends UnitTestCase {
     $this->mappedObject
       ->expects($this->any())
       ->method('delete')
-      ->willReturn(true);
+      ->willReturn(TRUE);
     $this->mappedObject
       ->expects($this->any())
       ->method('getMapping')
@@ -100,13 +94,13 @@ class DeleteHandlerTest extends UnitTestCase {
     $this->mappedObject
       ->expects($this->any())
       ->method('getFieldDefinitions')
-      ->willReturn(['entity_type_id','entity_id','salesforce_mapping']);
+      ->willReturn(['entity_type_id', 'entity_id', 'salesforce_mapping']);
     $this->mappedObject
       ->expects($this->any())
       ->method('getMappedEntity')
       ->willReturn($this->entity);
 
-    // mock mapping ConfigEntityStorage object
+    // Mock mapping ConfigEntityStorage object.
     $prophecy = $this->prophesize(SalesforceMappingStorage::CLASS);
     $prophecy->loadByProperties(Argument::any())->willReturn([$this->mapping]);
     $prophecy->load(Argument::any())->willReturn($this->mapping);
@@ -115,7 +109,7 @@ class DeleteHandlerTest extends UnitTestCase {
     ]);
     $this->configStorage = $prophecy->reveal();
 
-    // mock mapped object EntityStorage object
+    // Mock mapped object EntityStorage object.
     $this->entityStorage = $this->getMockBuilder(MappedObjectStorage::CLASS)
       ->disableOriginalConstructor()
       ->getMock();
@@ -123,35 +117,35 @@ class DeleteHandlerTest extends UnitTestCase {
       ->method('loadBySfid')
       ->willReturn([$this->mappedObject]);
 
-    // mock Drupal entity EntityStorage object
+    // Mock Drupal entity EntityStorage object.
     $prophecy = $this->prophesize(EntityStorageBase::CLASS);
     $prophecy->load(Argument::any())->willReturn($this->entity);
     $this->drupalEntityStorage = $prophecy->reveal();
 
-    // mock EntityTypeManagerInterface
+    // Mock EntityTypeManagerInterface.
     $prophecy = $this->prophesize(EntityTypeManagerInterface::CLASS);
     $prophecy->getStorage('salesforce_mapping')->willReturn($this->configStorage);
     $prophecy->getStorage('salesforce_mapped_object')->willReturn($this->entityStorage);
     $prophecy->getStorage('test')->willReturn($this->drupalEntityStorage);
     $this->etm = $prophecy->reveal();
 
-    // mock state
+    // Mock state.
     $prophecy = $this->prophesize(StateInterface::CLASS);
     $prophecy->get('salesforce_pull_last_delete_default', Argument::any())->willReturn('1485787434');
     $prophecy->set('salesforce_pull_last_delete_default', Argument::any())->willReturn(null);
     $this->state = $prophecy->reveal();
 
-    // mock logger
+    // Mock logger.
     $prophecy = $this->prophesize(LoggerInterface::CLASS);
-    $prophecy->log(Argument::any(), Argument::any(), Argument::any())->willReturn(null);
+    $prophecy->log(Argument::any(), Argument::any(), Argument::any())->willReturn(NULL);
     $this->logger = $prophecy->reveal();
 
-    // mock server
+    // Mock server.
     $prophecy = $this->prophesize(ServerBag::CLASS);
     $prophecy->get(Argument::any())->willReturn('1485787434');
     $this->server = $prophecy->reveal();
 
-    // mock request
+    // Mock request.
     $prophecy = $this->prophesize(Request::CLASS);
     $prophecy->server = $this->server;
     $this->request = $prophecy->reveal();
@@ -166,17 +160,18 @@ class DeleteHandlerTest extends UnitTestCase {
   }
 
   /**
-   * Test object instantiation
+   * Test object creation.
    */
   public function testObject() {
     $this->assertTrue($this->dh instanceof DeleteHandler);
   }
 
   /**
-   * Test handler operation, good data
+   * Test processDeletedRecords.
    */
   public function testGetUpdatedRecords() {
     $result = $this->dh->processDeletedRecords();
     $this->assertTrue($result);
   }
+
 }
diff --git a/src/Rest/RestClient.php b/src/Rest/RestClient.php
index 595df490..a26e5353 100644
--- a/src/Rest/RestClient.php
+++ b/src/Rest/RestClient.php
@@ -21,7 +21,7 @@ use GuzzleHttp\Psr7\Response;
 /**
  * Objects, properties, and methods to communicate with the Salesforce REST API.
  */
-class RestClient implements RestClientInterface {
+class RestClient extends RestClientBase implements RestClientInterface {
 
   /**
    * Reponse object.
@@ -59,7 +59,7 @@ class RestClient implements RestClientInterface {
   private $config;
 
   /**
-   * editable version of config entity.
+   * Editable version of config entity.
    *
    * @var \Drupal\Core\Config\Config
    */
@@ -75,7 +75,7 @@ class RestClient implements RestClientInterface {
   /**
    * The cache service.
    *
-   * @var Drupal\Core\Cache\CacheBackendInterface cache
+   * @var Drupal\Core\Cache\CacheBackendInterface Scache
    */
   protected $cache;
 
diff --git a/src/Rest/RestClientBase.php b/src/Rest/RestClientBase.php
new file mode 100644
index 00000000..d18f47b7
--- /dev/null
+++ b/src/Rest/RestClientBase.php
@@ -0,0 +1,856 @@
+<?php
+
+namespace Drupal\salesforce\Rest;
+
+use Drupal\Component\Serialization\Json;
+use Drupal\Component\Utility\Unicode;
+use Drupal\Component\Utility\UrlHelper;
+use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\State\StateInterface;
+use Drupal\Core\Url;
+use Drupal\salesforce\Rest\RestException;
+use Drupal\salesforce\SelectQuery;
+use Drupal\salesforce\SelectQueryResult;
+use Drupal\salesforce\SFID;
+use Drupal\salesforce\SObject;
+use GuzzleHttp\ClientInterface;
+use GuzzleHttp\Exception\RequestException;
+use GuzzleHttp\Psr7\Response;
+
+/**
+ * Objects, properties, and methods to communicate with the Salesforce REST API.
+ */
+class RestClientBase implements RestClientBaseInterface {
+
+  /**
+   * Reponse object.
+   *
+   * @var \GuzzleHttp\Psr7\Response
+   */
+  public $response;
+
+  /**
+   * GuzzleHttp client.
+   *
+   * @var \GuzzleHttp\ClientInterface
+   */
+  protected $httpClient;
+
+  /**
+   * Config factory service.
+   *
+   * @var \Drupal\Core\Config\ConfigFactoryInterface
+   */
+  protected $configFactory;
+
+  /**
+   * Salesforce API URL.
+   *
+   * @var Drupal\Core\Url
+   */
+  protected $url;
+
+  /**
+   * Salesforce config entity.
+   *
+   * @var \Drupal\Core\Config\ImmutableConfig
+   */
+  private $config;
+
+  /**
+   * Editable version of config entity.
+   *
+   * @var \Drupal\Core\Config\Config
+   */
+  private $configEditable;
+
+  /**
+   * The state service.
+   *
+   * @var \Drupal\Core\State\StateInterface $state
+   */
+  private $state;
+
+  /**
+   * The cache service.
+   *
+   * @var Drupal\Core\Cache\CacheBackendInterface Scache
+   */
+  protected $cache;
+
+  /**
+   * The JSON serializer service.
+   *
+   * @var \Drupal\Component\Serialization\Json $json
+   */
+  protected $json;
+
+  const CACHE_LIFETIME = 300;
+
+  /**
+   * Determine if this SF instance is fully configured.
+   *
+   * @TODO: Consider making a test API call.
+   */
+  public function isAuthorized() {
+    return $this->getConsumerKey() && $this->getConsumerSecret() && $this->getRefreshToken();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function apiCall($path, array $params = [], $method = 'GET', $returnObject = FALSE) {
+    if (!$this->getAccessToken()) {
+      $this->refreshToken();
+    }
+
+    try {
+      $this->response = new RestResponse($this->apiHttpRequest($path, $params, $method));
+    }
+    catch (RequestException $e) {
+      // RequestException gets thrown for any response status but 2XX.
+      $this->response = $e->getResponse();
+
+      // Any exceptions besides 401 get bubbled up.
+      if (!$this->response || $this->response->getStatusCode() != 401) {
+        throw new RestException($this->response, $e->getMessage());
+      }
+    }
+
+    if ($this->response->getStatusCode() == 401) {
+      // The session ID or OAuth token used has expired or is invalid: refresh
+      // token. If refreshToken() throws an exception, or if apiHttpRequest()
+      // throws anything but a RequestException, let it bubble up.
+      $this->refreshToken();
+      try {
+        $this->response = new RestResponse($this->apiHttpRequest($path, $params, $method));
+      }
+      catch (RequestException $e) {
+        $this->response = $e->getResponse();
+        throw new RestException($this->response, $e->getMessage());
+      }
+    }
+
+    if (empty($this->response)
+    || ((int)floor($this->response->getStatusCode() / 100)) != 2) {
+      throw new RestException($this->response, 'Unknown error occurred during API call');
+    }
+
+    if ($returnObject) {
+      return $this->response;
+    }
+    else {
+      return $this->response->data;
+    }
+  }
+
+  /**
+   * Private helper to issue an SF API request.
+   *
+   * @param string $path
+   *   Path to resource.
+   * @param array $params
+   *   Parameters to provide.
+   * @param string $method
+   *   Method to initiate the call, such as GET or POST.  Defaults to GET.
+   *
+   * @return GuzzleHttp\Psr7\Response
+   */
+  protected function apiHttpRequest($path, array $params, $method) {
+    if (!$this->getAccessToken()) {
+      throw new \Exception('Missing OAuth Token');
+    }
+    $url = $this->getApiEndPoint() . $path;
+
+    $headers = [
+      'Authorization' => 'OAuth ' . $this->getAccessToken(),
+      'Content-type' => 'application/json',
+    ];
+    $data = NULL;
+    if (!empty($params)) {
+      $data = $this->json->encode($params);
+    }
+    return $this->httpRequest($url, $data, $headers, $method);
+  }
+
+  /**
+   * Make the HTTP request. Wrapper around drupal_http_request().
+   *
+   * @param string $url
+   *   Path to make request from.
+   * @param array $data
+   *   The request body.
+   * @param array $headers
+   *   Request headers to send as name => value.
+   * @param string $method
+   *   Method to initiate the call, such as GET or POST.  Defaults to GET.
+   *
+   * @throws RequestException
+   *
+   * @return GuzzleHttp\Psr7\Response
+   */
+  protected function httpRequest($url, $data = NULL, array $headers = [], $method = 'GET') {
+    // Build the request, including path and headers. Internal use.
+    return $this->httpClient->$method($url, ['headers' => $headers, 'body' => $data]);
+  }
+
+  /**
+   * Extract normalized error information from a RequestException
+   *
+   * @param RequestException $e
+   * @return array
+   *   Error array with keys:
+   *   * message
+   *   * errorCode
+   *   * fields
+   */
+  protected function getErrorData(RequestException $e) {
+    $response = $e->getResponse();
+    $response_body = $response->getBody()->getContents();
+    $data = $this->json->decode($response_body);
+    if (!empty($data[0])) {
+      $data = $data[0];
+    }
+    return $data;
+  }
+
+
+  /**
+   * Get the API end point for a given type of the API.
+   *
+   * @param string $api_type
+   *   E.g., rest, partner, enterprise.
+   *
+   * @return string
+   *   Complete URL endpoint for API access.
+   */
+  public function getApiEndPoint($api_type = 'rest') {
+    $url = &drupal_static(__FUNCTION__ . $api_type);
+    if (!isset($url)) {
+      $identity = $this->getIdentity();
+      if (is_string($identity)) {
+        $url = $identity;
+      }
+      elseif (isset($identity['urls'][$api_type])) {
+        $url = $identity['urls'][$api_type];
+      }
+      $url = str_replace('{version}', $this->config->get('rest_api_version.version'), $url);
+    }
+    return $url;
+  }
+
+  /**
+   *
+   */
+  public function getConsumerKey() {
+    return $this->state->get('salesforce.consumer_key');
+  }
+
+  /**
+   *
+   */
+  public function setConsumerKey($value) {
+    return $this->state->set('salesforce.consumer_key', $value);
+  }
+
+  /**
+   *
+   */
+  public function getConsumerSecret() {
+    return $this->state->get('salesforce.consumer_secret');
+  }
+
+  /**
+   *
+   */
+  public function setConsumerSecret($value) {
+    return $this->state->set('salesforce.consumer_secret', $value);
+  }
+
+  /**
+   *
+   */
+  public function getLoginUrl() {
+    $login_url = $this->state->get('salesforce.login_url');
+    return empty($login_url) ? 'https://login.salesforce.com' : $login_url;
+  }
+
+  /**
+   *
+   */
+  public function setLoginUrl($value) {
+    return $this->state->set('salesforce.login_url', $value);
+  }
+
+  /**
+   * Get the SF instance URL. Useful for linking to objects.
+   */
+  public function getInstanceUrl() {
+    return $this->state->get('salesforce.instance_url');
+  }
+
+  /**
+   * Set the SF instance URL.
+   *
+   * @param string $url
+   *   URL to set.
+   */
+  protected function setInstanceUrl($url) {
+    $this->state->set('salesforce.instance_url', $url);
+    return $this;
+  }
+
+  /**
+   * Get the access token.
+   */
+  public function getAccessToken() {
+    $access_token = $this->state->get('salesforce.access_token');
+    return isset($access_token) && Unicode::strlen($access_token) !== 0 ? $access_token : FALSE;
+  }
+
+  /**
+   * Set the access token.
+   *
+   * @param string $token
+   *   Access token from Salesforce.
+   */
+  public function setAccessToken($token) {
+    $this->state->set('salesforce.access_token', $token);
+    return $this;
+  }
+
+  /**
+   * Get refresh token.
+   */
+  protected function getRefreshToken() {
+    return $this->state->get('salesforce.refresh_token');
+  }
+
+  /**
+   * Set refresh token.
+   *
+   * @param string $token
+   *   Refresh token from Salesforce.
+   */
+  protected function setRefreshToken($token) {
+    $this->state->set('salesforce.refresh_token', $token);
+    return $this;
+  }
+
+  /**
+   * Refresh access token based on the refresh token.
+   *
+   * @throws Exception
+   */
+  protected function refreshToken() {
+    $refresh_token = $this->getRefreshToken();
+    if (empty($refresh_token)) {
+      throw new \Exception(t('There is no refresh token.'));
+    }
+
+    $data = UrlHelper::buildQuery([
+      'grant_type' => 'refresh_token',
+      'refresh_token' => urldecode($refresh_token),
+      'client_id' => $this->getConsumerKey(),
+      'client_secret' => $this->getConsumerSecret(),
+    ]);
+
+    $url = $this->getAuthTokenUrl();
+    $headers = [
+      // This is an undocumented requirement on Salesforce's end.
+      'Content-Type' => 'application/x-www-form-urlencoded',
+    ];
+    $response = $this->httpRequest($url, $data, $headers, 'POST');
+
+    $this->handleAuthResponse($response);
+    return $this;
+  }
+
+  /**
+   * Helper callback for OAuth handshake, and refreshToken()
+   *
+   * @param GuzzleHttp\Psr7\Response $response
+   *   Response object from refreshToken or authToken endpoints.
+   *
+   * @see SalesforceController::oauthCallback()
+   * @see self::refreshToken()
+   */
+  public function handleAuthResponse(Response $response) {
+    if ($response->getStatusCode() != 200) {
+      throw new \Exception($response->getReasonPhrase(), $response->getStatusCode());
+    }
+
+    $data = (new RestResponse($response))->data;
+
+    $this
+      ->setAccessToken($data['access_token'])
+      ->initializeIdentity($data['id'])
+      ->setInstanceUrl($data['instance_url']);
+
+    // Do not overwrite an existing refresh token with an empty value.
+    if (!empty($data['refresh_token'])) {
+      $this->setRefreshToken($data['refresh_token']);
+    }
+    return $this;
+  }
+
+  /**
+   * Retrieve and store the Salesforce identity given an ID url.
+   *
+   * @param string $id
+   *   Identity URL.
+   *
+   * @throws Exception
+   */
+  public function initializeIdentity($id) {
+    $headers = [
+      'Authorization' => 'OAuth ' . $this->getAccessToken(),
+      'Content-type' => 'application/json',
+    ];
+    $response = $this->httpRequest($id, NULL, $headers);
+
+    if ($response->getStatusCode() != 200) {
+      throw new \Exception(t('Unable to access identity service.'), $response->getStatusCode());
+    }
+    $data = (new RestResponse($response))->data;
+
+    $this->setIdentity($data);
+    return $this;
+  }
+
+  /**
+   *
+   */
+  protected function setIdentity($data) {
+    $this->state->set('salesforce.identity', $data);
+    return $this;
+  }
+
+  /**
+   * Return the Salesforce identity, which is stored in a variable.
+   *
+   * @return array
+   *   Returns FALSE is no identity has been stored.
+   */
+  public function getIdentity() {
+    return $this->state->get('salesforce.identity');
+  }
+
+  /**
+   * Helper to build the redirect URL for OAUTH workflow.
+   *
+   * @return string
+   *   Redirect URL.
+   *
+   * @see Drupal\salesforce\Controller\SalesforceController
+   */
+  public function getAuthCallbackUrl() {
+    return Url::fromRoute('salesforce.oauth_callback', [], [
+      'absolute' => TRUE,
+      'https' => TRUE,
+    ])->toString();
+  }
+
+  /**
+   * Get Salesforce oauth login endpoint. (OAuth step 1)
+   *
+   * @return string
+   *   REST OAuth Login URL.
+   */
+  public function getAuthEndpointUrl() {
+    return $this->getLoginUrl() . '/services/oauth2/authorize';
+  }
+
+  /**
+   * Get Salesforce oauth token endpoint. (OAuth step 2)
+   *
+   * @return string
+   *   REST OAuth Token URL.
+   */
+  public function getAuthTokenUrl() {
+    return $this->getLoginUrl() . '/services/oauth2/token';
+  }
+
+  /**
+   * @defgroup salesforce_apicalls Wrapper calls around core apiCall()
+   */
+
+  /**
+   * Available objects and their metadata for your organization's data.
+   *
+   * @param array $conditions
+   *   Associative array of filters to apply to the returned objects. Filters
+   *   are applied after the list is returned from Salesforce.
+   * @param bool $reset
+   *   Whether to reset the cache and retrieve a fresh version from Salesforce.
+   *
+   * @return array
+   *   Available objects and metadata.
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function objects(array $conditions = ['updateable' => TRUE], $reset = FALSE) {
+    $cache = $this->cache->get('salesforce:objects');
+
+    // Force the recreation of the cache when it is older than 5 minutes.
+    if ($cache && $this->getRequestTime() < ($cache->created + self::CACHE_LIFETIME) && !$reset) {
+      $result = $cache->data;
+    }
+    else {
+      $result = $this->apiCall('sobjects');
+      $this->cache->set('salesforce:objects', $result, 0, ['salesforce']);
+    }
+
+    if (!empty($conditions)) {
+      foreach ($result['sobjects'] as $key => $object) {
+        foreach ($conditions as $condition => $value) {
+          if (!$object[$condition] == $value) {
+            unset($result['sobjects'][$key]);
+          }
+        }
+      }
+    }
+
+    return $result['sobjects'];
+  }
+
+  /**
+   * Use SOQL to get objects based on query string.
+   *
+   * @param SelectQuery $query
+   *   The constructed SOQL query.
+   *
+   * @return SelectQueryResult
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function query(SelectQuery $query) {
+    // $this->moduleHandler->alter('salesforce_query', $query);
+    // Casting $query as a string calls SelectQuery::__toString().
+    return new SelectQueryResult($this->apiCall('query?q=' . (string) $query));
+  }
+
+  /**
+   * Retreieve all the metadata for an object.
+   *
+   * @param string $name
+   *   Object type name, E.g., Contact, Account, etc.
+   * @param bool $reset
+   *   Whether to reset the cache and retrieve a fresh version from Salesforce.
+   *
+   * @return RestResponse_Describe
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function objectDescribe($name, $reset = FALSE) {
+    if (empty($name)) {
+      throw new \Exception('No name provided to describe');
+    }
+
+    $cache = $this->cache->get('salesforce:object:' . $name);
+    // Force the recreation of the cache when it is older than 5 minutes.
+    if ($cache && $this->getRequestTime() < ($cache->created + self::CACHE_LIFETIME) && !$reset) {
+      return $cache->data;
+    }
+    else {
+      $response = new RestResponse_Describe($this->apiCall("sobjects/{$name}/describe", [], 'GET', TRUE));
+      $this->cache->set('salesforce:object:' . $name, $response, 0, ['salesforce']);
+      return $response;
+    }
+  }
+
+  /**
+   * Create a new object of the given type.
+   *
+   * @param string $name
+   *   Object type name, E.g., Contact, Account, etc.
+   * @param array $params
+   *   Values of the fields to set for the object.
+   *
+   * @return Drupal\salesforce\SFID
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function objectCreate($name, array $params) {
+    $response = $this->apiCall("sobjects/{$name}", $params, 'POST', TRUE);
+    $data = $response->data;
+    return new SFID($data['id']);
+  }
+
+  /**
+   * Create new records or update existing records.
+   *
+   * The new records or updated records are based on the value of the specified
+   * field.  If the value is not unique, REST API returns a 300 response with
+   * the list of matching records and throws an Exception.
+   *
+   * @param string $name
+   *   Object type name, E.g., Contact, Account.
+   * @param string $key
+   *   The field to check if this record should be created or updated.
+   * @param string $value
+   *   The value for this record of the field specified for $key.
+   * @param array $params
+   *   Values of the fields to set for the object.
+   *
+   * @return Drupal\salesforce\SFID or NULL
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function objectUpsert($name, $key, $value, array $params) {
+    // If key is set, remove from $params to avoid UPSERT errors.
+    if (isset($params[$key])) {
+      unset($params[$key]);
+    }
+
+    $response = $this->apiCall("sobjects/{$name}/{$key}/{$value}", $params, 'PATCH', TRUE);
+
+    // On update, upsert method returns an empty body. Retreive object id, so that we can return a consistent response.
+    if ($response->getStatusCode() == 204) {
+      // We need a way to allow callers to distinguish updates and inserts. To
+      // that end, cache the original response and reset it after fetching the
+      // ID.
+      $this->original_response = $response;
+      $sf_object = $this->objectReadbyExternalId($name, $key, $value);
+      return $sf_object->id();
+    }
+    $data = $response->data;
+    return new SFID($data['id']);
+  }
+
+  /**
+   * Update an existing object.
+   *
+   * @param string $name
+   *   Object type name, E.g., Contact, Account.
+   * @param string $id
+   *   Salesforce id of the object.
+   * @param array $params
+   *   Values of the fields to set for the object.
+   *
+   * @return null
+   *   Update() doesn't return any data. Examine HTTP response or Exception.
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function objectUpdate($name, $id, array $params) {
+    $this->apiCall("sobjects/{$name}/{$id}", $params, 'PATCH');
+  }
+
+  /**
+   * Return a full loaded Salesforce object.
+   *
+   * @param string $name
+   *   Object type name, E.g., Contact, Account.
+   * @param string $id
+   *   Salesforce id of the object.
+   *
+   * @return SObject
+   *   Object of the requested Salesforce object.
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function objectRead($name, $id) {
+    return new SObject($this->apiCall("sobjects/{$name}/{$id}"));
+  }
+
+  /**
+   * Return a full loaded Salesforce object from External ID.
+   *
+   * @param string $name
+   *   Object type name, E.g., Contact, Account.
+   * @param string $field
+   *   Salesforce external id field name.
+   * @param string $value
+   *   Value of external id.
+   *
+   * @return SObject
+   *   Object of the requested Salesforce object.
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function objectReadbyExternalId($name, $field, $value) {
+    return new SObject($this->apiCall("sobjects/{$name}/{$field}/{$value}"));
+  }
+
+  /**
+   * Delete a Salesforce object. Note: if Object with given $id doesn't exist,
+   * objectDelete() will assume success unless $throw_exception is given.
+   *
+   * @param string $name
+   *   Object type name, E.g., Contact, Account.
+   * @param string $id
+   *   Salesforce id of the object.
+   * @pararm bool $throw_exception
+   *   (optional) If TRUE, 404 response code will cause RequestException to be
+   *   thrown. Otherwise, hide those errors. Default is FALSE.
+   *
+   * @addtogroup salesforce_apicalls
+   *
+   * @return null
+   *   Delete() doesn't return any data. Examine HTTP response or Exception.
+   */
+  public function objectDelete($name, $id, $throw_exception = FALSE) {
+    try {
+      $this->apiCall("sobjects/{$name}/{$id}", [], 'DELETE');
+    }
+    catch (RequestException $e) {
+      if ($throw_exception || $e->getResponse()->getStatusCode() != 404) {
+        throw $e;
+      }
+    }
+  }
+
+  /**
+   * Retrieves the list of individual objects that have been deleted within the
+   * given timespan for a specified object type.
+   *
+   * @param string $type
+   *   Object type name, E.g., Contact, Account.
+   * @param string $startDate
+   *   Start date to check for deleted objects (in ISO 8601 format).
+   * @param string $endDate
+   *   End date to check for deleted objects (in ISO 8601 format).
+   * @return GetDeletedResult
+   */
+  public function getDeleted($type, $startDate, $endDate) {
+    return $this->apiCall("sobjects/{$type}/deleted/?start={$startDate}&end={$endDate}");
+  }
+
+  /**
+   * Return a list of available resources for the configured API version.
+   *
+   * @return Drupal\salesforce\Rest\RestResponse_Resources
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function listResources() {
+    return new RestResponse_Resources($this->apiCall('', [], 'GET', TRUE));
+  }
+
+  /**
+   * Return a list of SFIDs for the given object, which have been created or
+   * updated in the given timeframe.
+   *
+   * @param string $name
+   *   Object type name, E.g., Contact, Account.
+   *
+   * @param int $start
+   *   unix timestamp for older timeframe for updates.
+   *   Defaults to "-29 days" if empty.
+   *
+   * @param int $end
+   *   unix timestamp for end of timeframe for updates.
+   *   Defaults to now if empty
+   *
+   * @return array
+   *   return array has 2 indexes:
+   *     "ids": a list of SFIDs of those records which have been created or
+   *       updated in the given timeframe.
+   *     "latestDateCovered": ISO 8601 format timestamp (UTC) of the last date
+   *       covered in the request.
+   *
+   * @see https://developer.salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/resources_getupdated.htm
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function getUpdated($name, $start = null, $end = null) {
+    if (empty($start)) {
+      $start = strtotime('-29 days');
+    }
+    $start = urlencode(gmdate(DATE_ATOM, $start));
+
+    if (empty($end)) {
+      $end = time();
+    }
+    $end = urlencode(gmdate(DATE_ATOM, $end));
+
+    return $this->apiCall("sobjects/{$name}/updated/?start=$start&end=$end");
+  }
+
+  /**
+   * Retrieve all record types for this org. If $name is provided, retrieve
+   * record types for the given object type only.
+   *
+   * @param string $name
+   *   Object type name, e.g. Contact, Account, etc.
+   *
+   * @return array
+   *   If $name is given, an array of record types indexed by developer name.
+   *   Otherwise, an array of record type arrays, indexed by object type name.
+   */
+  public function getRecordTypes($name = NULL, $reset = FALSE) {
+    $cache = $this->cache->get('salesforce:record_types');
+
+    // Force the recreation of the cache when it is older than CACHE_LIFETIME
+    if ($cache && $this->getRequestTime() < ($cache->created + self::CACHE_LIFETIME) && !$reset) {
+      $record_types = $cache->data;
+    }
+    else {
+      $query = new SelectQuery('RecordType');
+      $query->fields = array('Id', 'Name', 'DeveloperName', 'SobjectType');
+      $result = $this->query($query);
+      $record_types = array();
+      foreach ($result->records() as $rt) {
+        $record_types[$rt->field('SobjectType')][$rt->field('DeveloperName')] = $rt;
+      }
+      $this->cache->set('salesforce:record_types', $record_types, 0, ['salesforce']);
+    }
+
+    if ($name != NULL) {
+      if (!isset($record_types[$name])) {
+        throw new \Exception("No record types for $name");
+      }
+      return $record_types[$name];
+    }
+    return $record_types;
+  }
+
+  /**
+   * Given a DeveloperName and SObject Name, return the SFID of the
+   * corresponding RecordType. DeveloperName doesn't change between Salesforce
+   * environments, so it's safer to rely on compared to SFID.
+   *
+   * @param string $name
+   *   Object type name, E.g., Contact, Account.
+   *
+   * @param string $devname
+   *   RecordType DeveloperName, e.g. Donation, Membership, etc.
+   *
+   * @return SFID
+   *   The Salesforce ID of the given Record Type, or null.
+   *
+   * @throws Exception if record type not found
+   */
+  public function getRecordTypeIdByDeveloperName($name, $devname, $reset = FALSE) {
+    $record_types = $this->getRecordTypes();
+    if (empty($record_types[$name][$devname])) {
+      throw new \Exception("No record type $devname for $name");
+    }
+    return $record_types[$name][$devname]->id();
+  }
+
+  /**
+   * Utility function to determine object type for given SFID
+   *
+   * @param SFID $id
+   * @return string
+   * @throws Exception if SFID doesn't match any object type
+   */
+  public static function getObjectTypeName(SFID $id) {
+    $prefix = substr((string)$id, 0, 3);
+    $describe = $this->objects();
+    foreach ($describe as $object) {
+      if ($prefix == $object['keyPrefix']) {
+        return $object['name'];
+      }
+    }
+    throw new \Exception('No matching object type');
+  }
+
+  protected function getRequestTime() {
+    return defined('REQUEST_TIME') ? REQUEST_TIME : (int) $_SERVER['REQUEST_TIME'];
+  }
+
+}
diff --git a/src/Rest/RestClientBaseInterface.php b/src/Rest/RestClientBaseInterface.php
new file mode 100644
index 00000000..d2bfbe59
--- /dev/null
+++ b/src/Rest/RestClientBaseInterface.php
@@ -0,0 +1,408 @@
+<?php
+
+namespace Drupal\salesforce\Rest;
+
+use Drupal\Component\Serialization\Json;
+use Drupal\Component\Utility\Unicode;
+use Drupal\Component\Utility\UrlHelper;
+use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\State\StateInterface;
+use Drupal\Core\Url;
+use Drupal\salesforce\SFID;
+use Drupal\salesforce\SObject;
+use Drupal\salesforce\SelectQuery;
+use Drupal\salesforce\SelectQueryResult;
+use GuzzleHttp\ClientInterface;
+use GuzzleHttp\Exception\RequestException;
+use GuzzleHttp\Psr7\Response;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Objects, properties, and methods to communicate with the Salesforce REST API.
+ */
+interface RestClientBaseInterface {
+
+  /**
+   * Determine if this SF instance is fully configured.
+   *
+   * @TODO: Consider making a test API call.
+   */
+  public function isAuthorized();
+
+  /**
+   * Make a call to the Salesforce REST API.
+   *
+   * @param string $path
+   *   Path to resource.
+   * @param array $params
+   *   Parameters to provide.
+   * @param string $method
+   *   Method to initiate the call, such as GET or POST.  Defaults to GET.
+   * @param bool $returnObject
+   *   If true, return a Drupal\salesforce\Rest\RestResponse;
+   *   Otherwise, return json-decoded response body only.
+   *   Defaults to FALSE for backwards compatibility.
+   *
+   * @return mixed
+   *
+   * @throws GuzzleHttp\Exception\RequestException
+   */
+  public function apiCall($path, array $params = [], $method = 'GET', $returnObject = FALSE);
+
+  /**
+   * Get the API end point for a given type of the API.
+   *
+   * @param string $api_type
+   *   E.g., rest, partner, enterprise.
+   *
+   * @return string
+   *   Complete URL endpoint for API access.
+   */
+  public function getApiEndPoint($api_type = 'rest');
+
+  /**
+   *
+   */
+  public function getConsumerKey();
+
+  /**
+   *
+   */
+  public function setConsumerKey($value);
+
+  /**
+   *
+   */
+  public function getConsumerSecret();
+
+  /**
+   *
+   */
+  public function setConsumerSecret($value);
+
+  /**
+   *
+   */
+  public function getLoginUrl();
+
+  /**
+   *
+   */
+  public function setLoginUrl($value);
+
+  /**
+   * Get the SF instance URL. Useful for linking to objects.
+   */
+  public function getInstanceUrl();
+
+  /**
+   * Get the access token.
+   */
+  public function getAccessToken();
+
+  /**
+   * Set the access token.
+   *
+   * @param string $token
+   *   Access token from Salesforce.
+   */
+  public function setAccessToken($token);
+
+  /**
+   * Helper callback for OAuth handshake, and refreshToken()
+   *
+   * @param GuzzleHttp\Psr7\Response $response
+   *   Response object from refreshToken or authToken endpoints.
+   *
+   * @see SalesforceController::oauthCallback()
+   * @see self::refreshToken()
+   */
+  public function handleAuthResponse(Response $response);
+
+  /**
+   * Retrieve and store the Salesforce identity given an ID url.
+   *
+   * @param string $id
+   *   Identity URL.
+   *
+   * @throws Exception
+   */
+  public function initializeIdentity($id);
+
+  /**
+   * Return the Salesforce identity, which is stored in a variable.
+   *
+   * @return array
+   *   Returns FALSE is no identity has been stored.
+   */
+  public function getIdentity();
+
+  /**
+   * Helper to build the redirect URL for OAUTH workflow.
+   *
+   * @return string
+   *   Redirect URL.
+   *
+   * @see Drupal\salesforce\Controller\SalesforceController
+   */
+  public function getAuthCallbackUrl();
+
+  /**
+   * Get Salesforce oauth login endpoint. (OAuth step 1)
+   *
+   * @return string
+   *   REST OAuth Login URL.
+   */
+  public function getAuthEndpointUrl();
+
+  /**
+   * Get Salesforce oauth token endpoint. (OAuth step 2)
+   *
+   * @return string
+   *   REST OAuth Token URL.
+   */
+  public function getAuthTokenUrl();
+
+  /**
+   * @defgroup salesforce_apicalls Wrapper calls around core apiCall()
+   */
+
+  /**
+   * Available objects and their metadata for your organization's data.
+   *
+   * @param array $conditions
+   *   Associative array of filters to apply to the returned objects. Filters
+   *   are applied after the list is returned from Salesforce.
+   * @param bool $reset
+   *   Whether to reset the cache and retrieve a fresh version from Salesforce.
+   *
+   * @return array
+   *   Available objects and metadata.
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function objects(array $conditions = ['updateable' => TRUE], $reset = FALSE);
+
+  /**
+   * Use SOQL to get objects based on query string.
+   *
+   * @param SelectQuery $query
+   *   The constructed SOQL query.
+   *
+   * @return SelectQueryResult
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function query(SelectQuery $query);
+
+  /**
+   * Retreieve all the metadata for an object.
+   *
+   * @param string $name
+   *   Object type name, E.g., Contact, Account, etc.
+   * @param bool $reset
+   *   Whether to reset the cache and retrieve a fresh version from Salesforce.
+   *
+   * @return RestResponse_Describe
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function objectDescribe($name, $reset = FALSE);
+
+  /**
+   * Create a new object of the given type.
+   *
+   * @param string $name
+   *   Object type name, E.g., Contact, Account, etc.
+   * @param array $params
+   *   Values of the fields to set for the object.
+   *
+   * @return Drupal\salesforce\SFID
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function objectCreate($name, array $params);
+
+  /**
+   * Create new records or update existing records.
+   *
+   * The new records or updated records are based on the value of the specified
+   * field.  If the value is not unique, REST API returns a 300 response with
+   * the list of matching records and throws an Exception.
+   *
+   * @param string $name
+   *   Object type name, E.g., Contact, Account.
+   * @param string $key
+   *   The field to check if this record should be created or updated.
+   * @param string $value
+   *   The value for this record of the field specified for $key.
+   * @param array $params
+   *   Values of the fields to set for the object.
+   *
+   * @return Drupal\salesforce\SFID or NULL
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function objectUpsert($name, $key, $value, array $params);
+
+  /**
+   * Update an existing object.
+   *
+   * @param string $name
+   *   Object type name, E.g., Contact, Account.
+   * @param string $id
+   *   Salesforce id of the object.
+   * @param array $params
+   *   Values of the fields to set for the object.
+   *
+   * @return null
+   *   Update() doesn't return any data. Examine HTTP response or Exception.
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function objectUpdate($name, $id, array $params);
+
+  /**
+   * Return a full loaded Salesforce object.
+   *
+   * @param string $name
+   *   Object type name, E.g., Contact, Account.
+   * @param string $id
+   *   Salesforce id of the object.
+   *
+   * @return SObject
+   *   Object of the requested Salesforce object.
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function objectRead($name, $id);
+
+  /**
+   * Return a full loaded Salesforce object from External ID.
+   *
+   * @param string $name
+   *   Object type name, E.g., Contact, Account.
+   * @param string $field
+   *   Salesforce external id field name.
+   * @param string $value
+   *   Value of external id.
+   *
+   * @return SObject
+   *   Object of the requested Salesforce object.
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function objectReadbyExternalId($name, $field, $value);
+
+  /**
+   * Delete a Salesforce object. Note: if Object with given $id doesn't exist,
+   * objectDelete() will assume success unless $throw_exception is given.
+   *
+   * @param string $name
+   *   Object type name, E.g., Contact, Account.
+   * @param string $id
+   *   Salesforce id of the object.
+   * @pararm bool $throw_exception
+   *   (optional) If TRUE, 404 response code will cause RequestException to be
+   *   thrown. Otherwise, hide those errors. Default is FALSE.
+   *
+   * @addtogroup salesforce_apicalls
+   *
+   * @return null
+   *   Delete() doesn't return any data. Examine HTTP response or Exception.
+   */
+  public function objectDelete($name, $id, $throw_exception = FALSE);
+
+  /**
+   * Retrieves the list of individual objects that have been deleted within the
+   * given timespan for a specified object type.
+   *
+   * @param string $type
+   *   Object type name, E.g., Contact, Account.
+   * @param string $startDate
+   *   Start date to check for deleted objects (in ISO 8601 format).
+   * @param string $endDate
+   *   End date to check for deleted objects (in ISO 8601 format).
+   * @return GetDeletedResult
+   */
+  public function getDeleted($type, $startDate, $endDate);
+
+  /**
+   * Return a list of available resources for the configured API version.
+   *
+   * @return Drupal\salesforce\Rest\RestResponse_Resources
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function listResources();
+
+  /**
+   * Return a list of SFIDs for the given object, which have been created or
+   * updated in the given timeframe.
+   *
+   * @param string $name
+   *   Object type name, E.g., Contact, Account.
+   *
+   * @param int $start
+   *   unix timestamp for older timeframe for updates.
+   *   Defaults to "-29 days" if empty.
+   *
+   * @param int $end
+   *   unix timestamp for end of timeframe for updates.
+   *   Defaults to now if empty
+   *
+   * @return array
+   *   return array has 2 indexes:
+   *     "ids": a list of SFIDs of those records which have been created or
+   *       updated in the given timeframe.
+   *     "latestDateCovered": ISO 8601 format timestamp (UTC) of the last date
+   *       covered in the request.
+   *
+   * @see https://developer.salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/resources_getupdated.htm
+   *
+   * @addtogroup salesforce_apicalls
+   */
+  public function getUpdated($name, $start = null, $end = null);
+
+  /**
+   * Retrieve all record types for this org. If $name is provided, retrieve
+   * record types for the given object type only.
+   *
+   * @param string $name
+   *   Object type name, e.g. Contact, Account, etc.
+   *
+   * @return array
+   *   If $name is given, an array of record types indexed by developer name.
+   *   Otherwise, an array of record type arrays, indexed by object type name.
+   */
+  public function getRecordTypes($name = NULL);
+
+  /**
+   * Given a DeveloperName and SObject Name, return the SFID of the
+   * corresponding RecordType. DeveloperName doesn't change between Salesforce
+   * environments, so it's safer to rely on compared to SFID.
+   *
+   * @param string $name
+   *   Object type name, E.g., Contact, Account.
+   *
+   * @param string $devname
+   *   RecordType DeveloperName, e.g. Donation, Membership, etc.
+   *
+   * @return SFID
+   *   The Salesforce ID of the given Record Type, or null.
+   *
+   * @throws Exception if record type not found
+   */
+  public function getRecordTypeIdByDeveloperName($name, $devname, $reset = FALSE);
+
+  /**
+   * Utility function to determine object type for given SFID
+   *
+   * @param SFID $id
+   * @return string
+   * @throws Exception if SFID doesn't match any object type
+   */
+  public static function getObjectTypeName(SFID $id);
+
+}
diff --git a/src/Rest/RestClientInterface.php b/src/Rest/RestClientInterface.php
index 09d81894..8f9181a3 100644
--- a/src/Rest/RestClientInterface.php
+++ b/src/Rest/RestClientInterface.php
@@ -17,408 +17,27 @@ use GuzzleHttp\ClientInterface;
 use GuzzleHttp\Exception\RequestException;
 use GuzzleHttp\Psr7\Response;
 use Symfony\Component\DependencyInjection\ContainerInterface;
+use Drupal\salesforce\Rest\RestClientBaseInterface;
 
 /**
  * Objects, properties, and methods to communicate with the Salesforce REST API.
  */
-interface RestClientInterface {
+interface RestClientInterface extends RestClientBaseInterface {
 
   /**
    * Constructor which initializes the consumer.
    *
-   * @param \Drupal\Core\Http\Client $http_client
-   *   The HTTP Client.
-   * @param \Guzzle\Http\ClientInterface $http_client
-   *   The Guzzle Client.
+   * @param \GuzzleHttp\ClientInterface $http_client
+   *   The GuzzleHttp Client.
+   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
+   *   The config factory service.
    * @param \Drupal\Core\State\StateInterface $state
    *   The state service.
-   * @param \Drupal\Core\Cache\CacheBackendInterface cache
+   * @param \Drupal\Core\Cache\CacheBackendInterface $cache
    *   The cache service.
    * @param \Drupal\Component\Serialization\Json $json
    *   The JSON serializer service.
    */
   public function __construct(ClientInterface $http_client, ConfigFactoryInterface $config_factory, StateInterface $state, CacheBackendInterface $cache, Json $json);
 
-  /**
-   * Determine if this SF instance is fully configured.
-   *
-   * @TODO: Consider making a test API call.
-   */
-  public function isAuthorized();
-
-  /**
-   * Make a call to the Salesforce REST API.
-   *
-   * @param string $path
-   *   Path to resource.
-   * @param array $params
-   *   Parameters to provide.
-   * @param string $method
-   *   Method to initiate the call, such as GET or POST.  Defaults to GET.
-   * @param bool $returnObject
-   *   If true, return a Drupal\salesforce\Rest\RestResponse;
-   *   Otherwise, return json-decoded response body only.
-   *   Defaults to FALSE for backwards compatibility.
-   *
-   * @return mixed
-   *
-   * @throws GuzzleHttp\Exception\RequestException
-   */
-  public function apiCall($path, array $params = [], $method = 'GET', $returnObject = FALSE);
-
-  /**
-   * Get the API end point for a given type of the API.
-   *
-   * @param string $api_type
-   *   E.g., rest, partner, enterprise.
-   *
-   * @return string
-   *   Complete URL endpoint for API access.
-   */
-  public function getApiEndPoint($api_type = 'rest');
-
-  /**
-   *
-   */
-  public function getConsumerKey();
-
-  /**
-   *
-   */
-  public function setConsumerKey($value);
-
-  /**
-   *
-   */
-  public function getConsumerSecret();
-
-  /**
-   *
-   */
-  public function setConsumerSecret($value);
-
-  /**
-   *
-   */
-  public function getLoginUrl();
-
-  /**
-   *
-   */
-  public function setLoginUrl($value);
-
-  /**
-   * Get the SF instance URL. Useful for linking to objects.
-   */
-  public function getInstanceUrl();
-
-  /**
-   * Get the access token.
-   */
-  public function getAccessToken();
-
-  /**
-   * Set the access token.
-   *
-   * @param string $token
-   *   Access token from Salesforce.
-   */
-  public function setAccessToken($token);
-
-  /**
-   * Helper callback for OAuth handshake, and refreshToken()
-   *
-   * @param GuzzleHttp\Psr7\Response $response
-   *   Response object from refreshToken or authToken endpoints.
-   *
-   * @see SalesforceController::oauthCallback()
-   * @see self::refreshToken()
-   */
-  public function handleAuthResponse(Response $response);
-
-  /**
-   * Retrieve and store the Salesforce identity given an ID url.
-   *
-   * @param string $id
-   *   Identity URL.
-   *
-   * @throws Exception
-   */
-  public function initializeIdentity($id);
-
-  /**
-   * Return the Salesforce identity, which is stored in a variable.
-   *
-   * @return array
-   *   Returns FALSE is no identity has been stored.
-   */
-  public function getIdentity();
-
-  /**
-   * Helper to build the redirect URL for OAUTH workflow.
-   *
-   * @return string
-   *   Redirect URL.
-   *
-   * @see Drupal\salesforce\Controller\SalesforceController
-   */
-  public function getAuthCallbackUrl();
-
-  /**
-   * Get Salesforce oauth login endpoint. (OAuth step 1)
-   *
-   * @return string
-   *   REST OAuth Login URL.
-   */
-  public function getAuthEndpointUrl();
-
-  /**
-   * Get Salesforce oauth token endpoint. (OAuth step 2)
-   *
-   * @return string
-   *   REST OAuth Token URL.
-   */
-  public function getAuthTokenUrl();
-
-  /**
-   * @defgroup salesforce_apicalls Wrapper calls around core apiCall()
-   */
-
-  /**
-   * Available objects and their metadata for your organization's data.
-   *
-   * @param array $conditions
-   *   Associative array of filters to apply to the returned objects. Filters
-   *   are applied after the list is returned from Salesforce.
-   * @param bool $reset
-   *   Whether to reset the cache and retrieve a fresh version from Salesforce.
-   *
-   * @return array
-   *   Available objects and metadata.
-   *
-   * @addtogroup salesforce_apicalls
-   */
-  public function objects(array $conditions = ['updateable' => TRUE], $reset = FALSE);
-
-  /**
-   * Use SOQL to get objects based on query string.
-   *
-   * @param SelectQuery $query
-   *   The constructed SOQL query.
-   *
-   * @return SelectQueryResult
-   *
-   * @addtogroup salesforce_apicalls
-   */
-  public function query(SelectQuery $query);
-
-  /**
-   * Retreieve all the metadata for an object.
-   *
-   * @param string $name
-   *   Object type name, E.g., Contact, Account, etc.
-   * @param bool $reset
-   *   Whether to reset the cache and retrieve a fresh version from Salesforce.
-   *
-   * @return RestResponse_Describe
-   *
-   * @addtogroup salesforce_apicalls
-   */
-  public function objectDescribe($name, $reset = FALSE);
-
-  /**
-   * Create a new object of the given type.
-   *
-   * @param string $name
-   *   Object type name, E.g., Contact, Account, etc.
-   * @param array $params
-   *   Values of the fields to set for the object.
-   *
-   * @return Drupal\salesforce\SFID
-   *
-   * @addtogroup salesforce_apicalls
-   */
-  public function objectCreate($name, array $params);
-
-  /**
-   * Create new records or update existing records.
-   *
-   * The new records or updated records are based on the value of the specified
-   * field.  If the value is not unique, REST API returns a 300 response with
-   * the list of matching records and throws an Exception.
-   *
-   * @param string $name
-   *   Object type name, E.g., Contact, Account.
-   * @param string $key
-   *   The field to check if this record should be created or updated.
-   * @param string $value
-   *   The value for this record of the field specified for $key.
-   * @param array $params
-   *   Values of the fields to set for the object.
-   *
-   * @return Drupal\salesforce\SFID or NULL
-   *
-   * @addtogroup salesforce_apicalls
-   */
-  public function objectUpsert($name, $key, $value, array $params);
-
-  /**
-   * Update an existing object.
-   *
-   * @param string $name
-   *   Object type name, E.g., Contact, Account.
-   * @param string $id
-   *   Salesforce id of the object.
-   * @param array $params
-   *   Values of the fields to set for the object.
-   *
-   * @return null
-   *   Update() doesn't return any data. Examine HTTP response or Exception.
-   *
-   * @addtogroup salesforce_apicalls
-   */
-  public function objectUpdate($name, $id, array $params);
-
-  /**
-   * Return a full loaded Salesforce object.
-   *
-   * @param string $name
-   *   Object type name, E.g., Contact, Account.
-   * @param string $id
-   *   Salesforce id of the object.
-   *
-   * @return SObject
-   *   Object of the requested Salesforce object.
-   *
-   * @addtogroup salesforce_apicalls
-   */
-  public function objectRead($name, $id);
-
-  /**
-   * Return a full loaded Salesforce object from External ID.
-   *
-   * @param string $name
-   *   Object type name, E.g., Contact, Account.
-   * @param string $field
-   *   Salesforce external id field name.
-   * @param string $value
-   *   Value of external id.
-   *
-   * @return SObject
-   *   Object of the requested Salesforce object.
-   *
-   * @addtogroup salesforce_apicalls
-   */
-  public function objectReadbyExternalId($name, $field, $value);
-
-  /**
-   * Delete a Salesforce object. Note: if Object with given $id doesn't exist,
-   * objectDelete() will assume success unless $throw_exception is given.
-   *
-   * @param string $name
-   *   Object type name, E.g., Contact, Account.
-   * @param string $id
-   *   Salesforce id of the object.
-   * @pararm bool $throw_exception
-   *   (optional) If TRUE, 404 response code will cause RequestException to be
-   *   thrown. Otherwise, hide those errors. Default is FALSE.
-   *
-   * @addtogroup salesforce_apicalls
-   *
-   * @return null
-   *   Delete() doesn't return any data. Examine HTTP response or Exception.
-   */
-  public function objectDelete($name, $id, $throw_exception = FALSE);
-
-  /**
-   * Retrieves the list of individual objects that have been deleted within the
-   * given timespan for a specified object type.
-   *
-   * @param string $type
-   *   Object type name, E.g., Contact, Account.
-   * @param string $startDate
-   *   Start date to check for deleted objects (in ISO 8601 format).
-   * @param string $endDate
-   *   End date to check for deleted objects (in ISO 8601 format).
-   * @return GetDeletedResult
-   */
-  public function getDeleted($type, $startDate, $endDate);
-
-  /**
-   * Return a list of available resources for the configured API version.
-   *
-   * @return Drupal\salesforce\Rest\RestResponse_Resources
-   *
-   * @addtogroup salesforce_apicalls
-   */
-  public function listResources();
-
-  /**
-   * Return a list of SFIDs for the given object, which have been created or
-   * updated in the given timeframe.
-   *
-   * @param string $name
-   *   Object type name, E.g., Contact, Account.
-   *
-   * @param int $start
-   *   unix timestamp for older timeframe for updates.
-   *   Defaults to "-29 days" if empty.
-   *
-   * @param int $end
-   *   unix timestamp for end of timeframe for updates.
-   *   Defaults to now if empty
-   *
-   * @return array
-   *   return array has 2 indexes:
-   *     "ids": a list of SFIDs of those records which have been created or
-   *       updated in the given timeframe.
-   *     "latestDateCovered": ISO 8601 format timestamp (UTC) of the last date
-   *       covered in the request.
-   *
-   * @see https://developer.salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/resources_getupdated.htm
-   *
-   * @addtogroup salesforce_apicalls
-   */
-  public function getUpdated($name, $start = null, $end = null);
-
-  /**
-   * Retrieve all record types for this org. If $name is provided, retrieve
-   * record types for the given object type only.
-   *
-   * @param string $name
-   *   Object type name, e.g. Contact, Account, etc.
-   *
-   * @return array
-   *   If $name is given, an array of record types indexed by developer name.
-   *   Otherwise, an array of record type arrays, indexed by object type name.
-   */
-  public function getRecordTypes($name = NULL);
-
-  /**
-   * Given a DeveloperName and SObject Name, return the SFID of the
-   * corresponding RecordType. DeveloperName doesn't change between Salesforce
-   * environments, so it's safer to rely on compared to SFID.
-   *
-   * @param string $name
-   *   Object type name, E.g., Contact, Account.
-   *
-   * @param string $devname
-   *   RecordType DeveloperName, e.g. Donation, Membership, etc.
-   *
-   * @return SFID
-   *   The Salesforce ID of the given Record Type, or null.
-   *
-   * @throws Exception if record type not found
-   */
-  public function getRecordTypeIdByDeveloperName($name, $devname, $reset = FALSE);
-
-  /**
-   * Utility function to determine object type for given SFID
-   *
-   * @param SFID $id
-   * @return string
-   * @throws Exception if SFID doesn't match any object type
-   */
-  public static function getObjectTypeName(SFID $id);
-
 }
diff --git a/tests/src/Unit/RestClientTest.php b/tests/src/Unit/RestClientTest.php
index 9500d154..d208ccab 100644
--- a/tests/src/Unit/RestClientTest.php
+++ b/tests/src/Unit/RestClientTest.php
@@ -54,7 +54,7 @@ class RestClientTest extends UnitTestCase {
   }
 
   /**
-   * @covers ::__constrict
+   * @covers ::__construct
    */
   private function initClient($methods = NULL) {
     if (empty($methods)) {
-- 
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