Issue #2357119 by claudiu.cristea, mondrake, attiks: Allow image toolkit derivatives

core/core.services.yml

@@ -1256,7 +1256,7 @@ services:
       - { name: plugin_manager_cache_clear }
   image.toolkit.operation.manager:
     class: Drupal\Core\ImageToolkit\ImageToolkitOperationManager
-    arguments: ['@logger.channel.image']
+    arguments: ['@logger.channel.image', '@image.toolkit.manager']
     parent: default_plugin_manager
     tags:
       - { name: plugin_manager_cache_clear }

core/lib/Drupal/Core/ImageToolkit/ImageToolkitOperationManager.php

@@ -32,6 +32,13 @@ class ImageToolkitOperationManager extends DefaultPluginManager implements Image
    */
   protected $logger;
 
+  /**
+   * The image toolkit manager.
+   *
+   * @var \Drupal\Core\ImageToolkit\ImageToolkitManager
+   */
+  protected $toolkitManager;
+
   /**
    * Constructs the ImageToolkitOperationManager object.
    *
@@ -44,20 +51,23 @@ class ImageToolkitOperationManager extends DefaultPluginManager implements Image
    *   The module handler to invoke the alter hook with.
    * @param \Psr\Log\LoggerInterface $logger
    *   A logger instance.
+   * @param \Drupal\Core\ImageToolkit\ImageToolkitManager $toolkit_manager
+   *   The image toolkit manager.
    */
-  public function __construct(\Traversable $namespaces, CacheBackendInterface $cache_backend, ModuleHandlerInterface $module_handler, LoggerInterface $logger) {
+  public function __construct(\Traversable $namespaces, CacheBackendInterface $cache_backend, ModuleHandlerInterface $module_handler, LoggerInterface $logger, ImageToolkitManager $toolkit_manager) {
     parent::__construct('Plugin/ImageToolkit/Operation', $namespaces, $module_handler, 'Drupal\Core\ImageToolkit\ImageToolkitOperationInterface', 'Drupal\Core\ImageToolkit\Annotation\ImageToolkitOperation');
 
     $this->alterInfo('image_toolkit_operation');
     $this->setCacheBackend($cache_backend, 'image_toolkit_operation_plugins');
     $this->logger = $logger;
+    $this->toolkitManager = $toolkit_manager;
   }
 
   /**
    * Returns the plugin ID for a given toolkit and operation.
    *
-   * @param string $toolkit_id
-   *   The toolkit plugin ID.
+   * @param \Drupal\Core\ImageToolkit\ImageToolkitInterface $toolkit
+   *   The toolkit instance.
    * @param string $operation
    *   The operation (e.g. "crop").
    *
@@ -67,7 +77,8 @@ class ImageToolkitOperationManager extends DefaultPluginManager implements Image
    * @throws \Drupal\Component\Plugin\Exception\PluginNotFoundException
    *   When no plugin is available.
    */
-  protected function getToolkitOperationPluginId($toolkit_id, $operation) {
+  protected function getToolkitOperationPluginId(ImageToolkitInterface $toolkit, $operation) {
+    $toolkit_id = $toolkit->getPluginId();
     $definitions = $this->getDefinitions();
 
     $definitions = array_filter($definitions,
@@ -77,6 +88,14 @@ class ImageToolkitOperationManager extends DefaultPluginManager implements Image
     );
 
     if (!$definitions) {
+      // If this image toolkit plugin is a derivative and returns no operation,
+      // try once again with its base plugin.
+      $base_toolkit_id = $toolkit->getBaseId();
+      if (($toolkit_id != $base_toolkit_id) && !empty($base_toolkit_id)) {
+        $base_toolkit = $this->toolkitManager->createInstance($base_toolkit_id);
+        return $this->getToolkitOperationPluginId($base_toolkit, $operation);
+      }
+
       $message = SafeMarkup::format("No image operation plugin for '@toolkit' toolkit and '@operation' operation.", array('@toolkit' => $toolkit_id, '@operation' => $operation));
       throw new PluginNotFoundException($toolkit_id . '.' . $operation, $message);
     }
@@ -102,7 +121,7 @@ class ImageToolkitOperationManager extends DefaultPluginManager implements Image
    * {@inheritdoc}
    */
   public function getToolkitOperation(ImageToolkitInterface $toolkit, $operation) {
-    $plugin_id = $this->getToolkitOperationPluginId($toolkit->getPluginId(), $operation);
+    $plugin_id = $this->getToolkitOperationPluginId($toolkit, $operation);
     return $this->createInstance($plugin_id, array(), $toolkit);
   }
 

core/modules/system/src/Tests/Image/ToolkitTest.php

@@ -21,6 +21,7 @@ class ToolkitTest extends ToolkitTestBase {
     $manager = $this->container->get('image.toolkit.manager');
     $toolkits = $manager->getAvailableToolkits();
     $this->assertTrue(isset($toolkits['test']), 'The working toolkit was returned.');
+    $this->assertTrue(isset($toolkits['test:derived_toolkit']), 'The derived toolkit was returned.');
     $this->assertFalse(isset($toolkits['broken']), 'The toolkit marked unavailable was not returned');
     $this->assertToolkitOperationsCalled(array());
   }
@@ -71,4 +72,22 @@ class ToolkitTest extends ToolkitTestBase {
     $this->assertEqual($calls['apply'][0][0], 'my_operation', "'my_operation' was passed correctly as operation");
     $this->assertEqual($calls['apply'][0][1], array(), 'passing no parameters was handled correctly');
   }
+
+  /**
+   * Tests image toolkit operations inheritance by derivative toolkits.
+   */
+  public function testDerivative() {
+    $toolkit_manager = $this->container->get('image.toolkit.manager');
+    $operation_manager = $this->container->get('image.toolkit.operation.manager');
+
+    $toolkit = $toolkit_manager->createInstance('test:derived_toolkit');
+
+    // Load an overwritten and an inherited operation.
+    $blur = $operation_manager->getToolkitOperation($toolkit, 'blur');
+    $invert = $operation_manager->getToolkitOperation($toolkit, 'invert');
+
+    $this->assertIdentical('foo_derived', $blur->getPluginId(), "'Blur' operation overwritten by derivative.");
+    $this->assertIdentical('bar', $invert->getPluginId(), '"Invert" operation inherited from base plugin.');
+  }
+
 }

core/modules/system/tests/modules/image_test/src/Plugin/ImageToolkit/DerivedToolkit.php

@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\image_test\Plugin\ImageToolkit\DerivedToolkit.
+ */
+
+namespace Drupal\image_test\Plugin\ImageToolkit;
+
+/**
+ * Provides a derivative of TestToolkit.
+ *
+ * @ImageToolkit(
+ *   id = "test:derived_toolkit",
+ *   title = @Translation("A dummy toolkit, derivative of 'test'.")
+ * )
+ */
+class DerivedToolkit extends TestToolkit { }

core/modules/system/tests/modules/image_test/src/Plugin/ImageToolkit/Operation/test/Bar.php

@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\image_test\Plugin\ImageToolkit\Operation\test\Bar
+ */
+
+namespace Drupal\image_test\Plugin\ImageToolkit\Operation\test;
+
+/**
+ * Builds an image toolkit operation.
+ *
+ * @ImageToolkitOperation(
+ *   id = "bar",
+ *   toolkit = "test",
+ *   operation = "invert",
+ *   label = @Translation("Invert"),
+ *   description = @Translation("Bar.")
+ * )
+ */
+class Bar extends OperationBase { }

core/modules/system/tests/modules/image_test/src/Plugin/ImageToolkit/Operation/test/Foo.php

@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\image_test\Plugin\ImageToolkit\Operation\test\Foo
+ */
+
+namespace Drupal\image_test\Plugin\ImageToolkit\Operation\test;
+
+/**
+ * Builds an image toolkit operation.
+ *
+ * @ImageToolkitOperation(
+ *   id = "foo",
+ *   toolkit = "test",
+ *   operation = "blur",
+ *   label = @Translation("Blur"),
+ *   description = @Translation("Foo.")
+ * )
+ */
+class Foo extends OperationBase { }

core/modules/system/tests/modules/image_test/src/Plugin/ImageToolkit/Operation/test/FooDerived.php

@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\image_test\Plugin\ImageToolkit\Operation\test\FooDerived
+ */
+
+namespace Drupal\image_test\Plugin\ImageToolkit\Operation\test;
+
+/**
+ * Builds an image toolkit operation.
+ *
+ * @ImageToolkitOperation(
+ *   id = "foo_derived",
+ *   toolkit = "test:derived_toolkit",
+ *   operation = "blur",
+ *   label = @Translation("Blur Derived"),
+ *   description = @Translation("Foo derived.")
+ * )
+ */
+class FooDerived extends OperationBase { }

core/modules/system/tests/modules/image_test/src/Plugin/ImageToolkit/Operation/test/OperationBase.php

@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\image_test\Plugin\ImageToolkit\Operation\test\OperationBase.
+ */
+
+namespace Drupal\image_test\Plugin\ImageToolkit\Operation\test;
+
+use Drupal\Core\ImageToolkit\ImageToolkitOperationBase;
+
+/**
+ * Provides a base class for test operations.
+ */
+abstract class OperationBase extends ImageToolkitOperationBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function arguments() {
+    return array();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function execute(array $arguments) {
+    // Nothing to do.
+  }
+
+}