From f17b5d44e6c39f5969fcda7e1e6adb0b1b77a833 Mon Sep 17 00:00:00 2001
From: Mark Jordan <mark2jordan@gmail.com>
Date: Wed, 26 Jun 2019 12:04:36 -0700
Subject: [PATCH] Adds a Context Condition to detect the MIME type of the media
 (#145)

---
 config/schema/islandora.schema.yml        |   7 +
 islandora.module                          |   1 +
 src/Plugin/Condition/MediaHasMimetype.php | 174 ++++++++++++++++++++++
 3 files changed, 182 insertions(+)
 create mode 100644 src/Plugin/Condition/MediaHasMimetype.php

diff --git a/config/schema/islandora.schema.yml b/config/schema/islandora.schema.yml
index 1df5b7e8..9c2d33fe 100644
--- a/config/schema/islandora.schema.yml
+++ b/config/schema/islandora.schema.yml
@@ -113,6 +113,13 @@ condition.plugin.media_uses_filesystem:
       sequence:
         type: string
 
+condition.plugin.media_has_mimetype:
+  type: condition.plugin
+  mapping:
+    mimetypes:
+      type: text
+      label: 'Mime types'
+
 condition.plugin.content_entity_type:
   type: condition.plugin
   mapping:
diff --git a/islandora.module b/islandora.module
index 8b0d52e1..5d55da16 100644
--- a/islandora.module
+++ b/islandora.module
@@ -347,6 +347,7 @@ function islandora_form_block_form_alter(&$form, FormStateInterface $form_state,
   unset($form['visibility']['file_uses_filesystem']);
   unset($form['visibility']['node_has_term']);
   unset($form['visibility']['media_uses_filesystem']);
+  unset($form['visibility']['media_has_mimetype']);
 }
 
 /**
diff --git a/src/Plugin/Condition/MediaHasMimetype.php b/src/Plugin/Condition/MediaHasMimetype.php
new file mode 100644
index 00000000..fcf085ed
--- /dev/null
+++ b/src/Plugin/Condition/MediaHasMimetype.php
@@ -0,0 +1,174 @@
+<?php
+
+namespace Drupal\islandora\Plugin\Condition;
+
+use Drupal\Core\Condition\ConditionPluginBase;
+use Drupal\Core\Entity\EntityTypeManager;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\islandora\IslandoraUtils;
+use Drupal\islandora\MediaSource\MediaSourceService;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a condition based on a node's media's MimeType.
+ *
+ * Note that this condition applies when the parent node is viewed.
+ * It is not fired during ingest (i.e., it doesn't apply to
+ * derivative generation).
+ *
+ * @Condition(
+ *   id = "media_has_mimetype",
+ *   label = @Translation("Media has Mime type"),
+ *   context_definitions = {
+ *     "node" = @ContextDefinition("entity:node", label = @Translation("node"))
+ *   }
+ * )
+ */
+class MediaHasMimetype extends ConditionPluginBase implements ContainerFactoryPluginInterface {
+
+  /**
+   * Islandora utils.
+   *
+   * @var \Drupal\islandora\IslandoraUtils
+   */
+  protected $utils;
+
+  /**
+   * Term storage.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManager
+   */
+  protected $entityTypeManager;
+
+  /**
+   * A MediaSourceService.
+   *
+   * @var \Drupal\islandora\MediaSource\MediaSourceService
+   */
+  private $mediaSource;
+
+  /**
+   * Constructor.
+   *
+   * @param array $configuration
+   *   The plugin configuration, i.e. an array with configuration values keyed
+   *   by configuration option name. The special key 'context' may be used to
+   *   initialize the defined contexts by setting it to an array of context
+   *   values keyed by context names.
+   * @param string $plugin_id
+   *   The plugin_id for the plugin instance.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param \Drupal\islandora\IslandoraUtils $utils
+   *   Islandora utility functions.
+   * @param \Drupal\Core\Entity\EntityTypeManager $entity_type_manager
+   *   Entity type manager.
+   * @param \Drupal\islandora\MediaSource\MediaSourceService $media_source
+   *   Media source service.
+   */
+  public function __construct(
+    array $configuration,
+    $plugin_id,
+    $plugin_definition,
+    IslandoraUtils $utils,
+    EntityTypeManager $entity_type_manager,
+    MediaSourceService $media_source
+  ) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition, $utils);
+    $this->utils = $utils;
+    $this->entityTypeManager = $entity_type_manager;
+    $this->mediaSource = $media_source;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $container->get('islandora.utils'),
+      $container->get('entity_type.manager'),
+      $container->get('islandora.media_source_service')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
+    $form['mimetypes'] = [
+      '#type' => 'textfield',
+      '#title' => t('Mime types'),
+      '#default_value' => $this->configuration['mimetypes'],
+      '#required' => TRUE,
+      '#maxlength' => 256,
+      '#description' => t('Comma-delimited list of Mime types (e.g. image/jpeg, video/mp4, etc...) that trigger the condition.'),
+    ];
+    return parent::buildConfigurationForm($form, $form_state);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
+    $this->configuration['mimetypes'] = $form_state->getValue('mimetypes');
+    parent::submitConfigurationForm($form, $form_state);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function summary() {
+    $mimetypes = $this->configuration['mimetypes'];
+    return $this->t(
+      'The media has one of the Mime types @mimetypes',
+      [
+        '@mimetypes' => $mimetypes,
+      ]
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function evaluate() {
+    if (empty($this->configuration['mimetypes']) && !$this->isNegated()) {
+      return TRUE;
+    }
+
+    $node = \Drupal::routeMatch()->getParameter('node');
+
+    if (is_null($node) || is_string($node)) {
+      return FALSE;
+    }
+
+    $media = $this->utils->getMedia($node);
+
+    if (count($media) > 0) {
+      $mimetypes = explode(',', str_replace(' ', '', $this->configuration['mimetypes']));
+      foreach ($media as $medium) {
+        $file = $this->mediaSource->getSourceFile($medium);
+        if (in_array($file->getMimeType(), $mimetypes)) {
+          return $this->isNegated() ? FALSE : TRUE;
+        }
+      }
+    }
+    else {
+      return FALSE;
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultConfiguration() {
+    return array_merge(
+      ['mimetypes' => ''],
+      parent::defaultConfiguration()
+    );
+  }
+
+}