Flysystem (#92)

* Flysystem adapter and REST API accepts Content-Location with a stream wrapper

* First pass is working now

* Config dump

* typo in composer.json

* Testing install

* Tests.  Coding standards

* Adding token as a depenedency

* Unneccessary config

* Adding drupal/token to composer.json

* Applying the file's uri using the mapping predicate alter.

* Tests vs coding standards whack-a-mole

* Sneaky image resize bug

* Test refactor to quiesce phpcpd.  How you like that @bradspry?

* _slightly_ better error reporting for tests

* Moar test updates

* phpcbf to the rescue

* Config export

* Fixing the Canoncial typo once and for all

* Better trimming

* Collapsing 'Is' style conditions into a singular 'ContentEntityType' condition

* Coding standards

* Was referencing is_node in a test

* Unbreaking core block placement

* Copy pasta fix and removing conditions I obliterated from the schema file.

composer.json

@@ -27,7 +27,10 @@
     "drupal/migrate_plus" : "4.0-beta3",
     "drupal/migrate_tools" : "4.0-beta3",
     "drupal/migrate_source_csv" : "^2.1",
-    "drupal/permissions_by_term" : "^1.51"
+    "drupal/permissions_by_term" : "^1.51",
+    "drupal/token" : "^1.3",
+    "drupal/flysystem" : "^1.0",
+    "islandora/chullo" : "dev-master"
   },
   "require-dev": {
     "phpunit/phpunit": "^6",

config/schema/islandora.schema.yml

@@ -64,22 +64,6 @@ action.configuration.delete_media_and_file:
   type: action_configuration_default
   label: 'Delete media and file'
 
-condition.plugin.is_node:
-  type: condition.plugin
-  mapping:
-
-condition.plugin.is_media:
-  type: condition.plugin
-  mapping:
-
-condition.plugin.is_file:
-  type: condition.plugin
-  mapping:
-
-condition.plugin.is_term:
-  type: condition.plugin
-  mapping:
-
 condition.plugin.node_has_term:
   type: condition.plugin
   mapping:
@@ -100,3 +84,27 @@ condition.plugin.parent_node_has_term:
     uri:
       type: text 
       label: 'Taxonomy Term URI'
+
+condition.plugin.file_uses_filesystem:
+  type: condition.plugin
+  mapping:
+    filesystems:
+      type: sequence
+      sequence:
+        type: string
+
+condition.plugin.media_uses_filesystem:
+  type: condition.plugin
+  mapping:
+    filesystems:
+      type: sequence
+      sequence:
+        type: string
+
+condition.plugin.content_entity_type:
+  type: condition.plugin
+  mapping:
+    types:
+      type: sequence
+      sequence:
+        type: string

islandora.info.yml

@@ -29,3 +29,5 @@ dependencies:
   - migrate_tools
   - migrate_source_csv
   - content_translation
+  - flysystem
+  - token

islandora.services.yml

@@ -47,7 +47,7 @@ services:
       - { name: 'context_provider' }
   islandora.media_source_service:
     class: Drupal\islandora\MediaSource\MediaSourceService
-    arguments: ['@entity_type.manager', '@current_user', '@stream_wrapper_manager', '@language_manager', '@token', '@entity.query']
+    arguments: ['@entity_type.manager', '@current_user', '@language_manager', '@entity.query', '@file_system']
   islandora.utils:
     class: Drupal\islandora\IslandoraUtils
-    arguments: ['@entity_type.manager', '@entity_field.manager', '@entity.query', '@context.manager', '@stream_wrapper_manager']
+    arguments: ['@entity_type.manager', '@entity_field.manager', '@entity.query', '@context.manager', '@flysystem_factory']

modules/islandora_core_feature/config/install/core.base_field_override.media.audio.name.yml

@@ -0,0 +1,19 @@
+langcode: en
+status: true
+dependencies:
+  config:
+    - media.type.audio
+id: media.audio.name
+field_name: name
+entity_type: media
+bundle: audio
+label: Name
+description: ''
+required: true
+translatable: true
+default_value:
+  -
+    value: ''
+default_value_callback: ''
+settings: {  }
+field_type: string

modules/islandora_core_feature/config/install/core.base_field_override.media.file.name.yml

@@ -0,0 +1,19 @@
+langcode: en
+status: true
+dependencies:
+  config:
+    - media.type.file
+id: media.file.name
+field_name: name
+entity_type: media
+bundle: file
+label: Name
+description: ''
+required: true
+translatable: true
+default_value:
+  -
+    value: ''
+default_value_callback: ''
+settings: {  }
+field_type: string

modules/islandora_core_feature/config/install/core.base_field_override.media.image.name.yml

@@ -0,0 +1,19 @@
+langcode: en
+status: true
+dependencies:
+  config:
+    - media.type.image
+id: media.image.name
+field_name: name
+entity_type: media
+bundle: image
+label: Name
+description: ''
+required: true
+translatable: true
+default_value:
+  -
+    value: ''
+default_value_callback: ''
+settings: {  }
+field_type: string

modules/islandora_core_feature/config/install/core.base_field_override.media.video.name.yml

@@ -0,0 +1,19 @@
+langcode: en
+status: true
+dependencies:
+  config:
+    - media.type.video
+id: media.video.name
+field_name: name
+entity_type: media
+bundle: video
+label: Name
+description: ''
+required: true
+translatable: true
+default_value:
+  -
+    value: ''
+default_value_callback: ''
+settings: {  }
+field_type: string

modules/islandora_core_feature/config/install/field.storage.media.field_media_audio_file.yml

@@ -12,10 +12,10 @@ field_name: field_media_audio_file
 entity_type: media
 type: file
 settings:
-  target_type: file
   display_field: false
   display_default: false
-  uri_scheme: public
+  uri_scheme: fedora
+  target_type: file
 module: file
 locked: false
 cardinality: 1

modules/islandora_core_feature/config/install/field.storage.media.field_media_file.yml

@@ -13,10 +13,10 @@ field_name: field_media_file
 entity_type: media
 type: file
 settings:
-  uri_scheme: public
-  target_type: file
   display_field: false
   display_default: false
+  uri_scheme: fedora
+  target_type: file
 module: file
 locked: false
 cardinality: 1

modules/islandora_core_feature/config/install/field.storage.media.field_media_image.yml

@@ -14,8 +14,9 @@ field_name: field_media_image
 entity_type: media
 type: image
 settings:
+  uri_scheme: fedora
   default_image:
-    uuid: null
+    uuid: ''
     alt: ''
     title: ''
     width: null
@@ -23,7 +24,6 @@ settings:
   target_type: file
   display_field: false
   display_default: false
-  uri_scheme: public
 module: image
 locked: false
 cardinality: 1

modules/islandora_core_feature/config/install/field.storage.media.field_media_video_file.yml

@@ -12,10 +12,10 @@ field_name: field_media_video_file
 entity_type: media
 type: file
 settings:
-  target_type: file
   display_field: false
   display_default: false
-  uri_scheme: public
+  uri_scheme: fedora
+  target_type: file
 module: file
 locked: false
 cardinality: 1

modules/islandora_core_feature/config/install/field.storage.media.field_mime_type.yml

@@ -17,7 +17,7 @@ settings:
 module: core
 locked: false
 cardinality: 1
-translatable: false
+translatable: true
 indexes: {  }
 persist_with_no_fields: false
 custom_storage: false

modules/islandora_core_feature/config/install/filehash.settings.yml

@@ -0,0 +1,5 @@
+algos:
+  sha1: sha1
+  md5: '0'
+  sha256: '0'
+dedupe: false

modules/islandora_core_feature/config/install/language.content_settings.media.audio.yml

@@ -8,6 +8,8 @@ dependencies:
 third_party_settings:
   content_translation:
     enabled: true
+    bundle_settings:
+      untranslatable_fields_hide: '0'
 id: media.audio
 target_entity_type_id: media
 target_bundle: audio

modules/islandora_core_feature/config/install/language.content_settings.media.file.yml

@@ -8,6 +8,8 @@ dependencies:
 third_party_settings:
   content_translation:
     enabled: true
+    bundle_settings:
+      untranslatable_fields_hide: '0'
 id: media.file
 target_entity_type_id: media
 target_bundle: file

modules/islandora_core_feature/config/install/language.content_settings.media.image.yml

@@ -8,6 +8,8 @@ dependencies:
 third_party_settings:
   content_translation:
     enabled: true
+    bundle_settings:
+      untranslatable_fields_hide: '0'
 id: media.image
 target_entity_type_id: media
 target_bundle: image

modules/islandora_core_feature/config/install/language.content_settings.media.video.yml

@@ -8,6 +8,8 @@ dependencies:
 third_party_settings:
   content_translation:
     enabled: true
+    bundle_settings:
+      untranslatable_fields_hide: '0'
 id: media.video
 target_entity_type_id: media
 target_bundle: video

modules/islandora_core_feature/config/install/language.content_settings.taxonomy_term.tags.yml

@@ -8,6 +8,8 @@ dependencies:
 third_party_settings:
   content_translation:
     enabled: false
+    bundle_settings:
+      untranslatable_fields_hide: '0'
 id: taxonomy_term.tags
 target_entity_type_id: taxonomy_term
 target_bundle: tags

modules/islandora_core_feature/config/install/system.action.delete_file_from_fedora.yml

@@ -7,9 +7,9 @@ dependencies:
   module:
     - islandora
 id: delete_file_from_fedora
-label: 'Delete File from Fedora'
+label: 'Delete Fedora File from Gemini'
 type: file
 plugin: emit_file_event
 configuration:
-  queue: islandora-indexing-fcrepo-delete
+  queue: islandora-indexing-fcrepo-file-delete
-  event: delete
+  event: Delete

modules/islandora_core_feature/config/install/system.action.index_file_in_fedora.yml

@@ -7,9 +7,9 @@ dependencies:
   module:
     - islandora
 id: index_file_in_fedora
-label: 'Index File in Fedora'
+label: 'Index Fedora File in Gemini'
 type: file
 plugin: emit_file_event
 configuration:
   queue: islandora-indexing-fcrepo-file
-  event: update
+  event: Create

modules/islandora_core_feature/config/install/views.view.file_checksum.yml

@@ -6,6 +6,7 @@ dependencies:
       - islandora_core_feature
   module:
     - file
+    - filehash
     - rest
     - serialization
 id: file_checksum

modules/islandora_core_feature/islandora_core_feature.info.yml

@@ -10,6 +10,7 @@ dependencies:
   - features
   - field
   - file
+  - filehash
   - image
   - islandora
   - jsonld

modules/islandora_demo_feature/config/install/context.context.external_media.yml

@@ -0,0 +1,46 @@
+langcode: en
+status: true
+dependencies:
+  module:
+    - islandora
+name: external_media
+label: 'External Media'
+group: Islandora
+description: 'Reactions for media whose source are outside of Fedora'
+requireAllConditions: true
+disabled: false
+conditions:
+  media_uses_filesystem:
+    id: media_uses_filesystem
+    filesystems:
+      fedora: fedora
+    negate: 1
+    uuid: 4f3c414a-8c94-464c-a4b9-5d3eb2b35e92
+    context_mapping:
+      media: '@islandora.media_route_context_provider:media'
+  content_entity_type:
+    id: content_entity_type
+    types:
+      media: media
+    negate: 0
+    uuid: c10985ef-16ef-4571-89ad-1a0926c83b83
+    context_mapping:
+      media: '@islandora.media_route_context_provider:media'
+reactions:
+  index:
+    id: index
+    actions:
+      index_media_in_triplestore: index_media_in_triplestore
+      index_node_in_fedora: index_node_in_fedora
+    saved: false
+  delete:
+    id: delete
+    actions:
+      delete_media_from_triplestore: delete_media_from_triplestore
+      delete_node_from_fedora: delete_node_from_fedora
+    saved: false
+  islandora_map_uri_predicate:
+    id: islandora_map_uri_predicate
+    drupal_uri_predicate: 'schema:sameAs'
+    saved: false
+weight: 0

modules/islandora_demo_feature/config/install/context.context.fedora_media.yml

@@ -1,22 +1,21 @@
 langcode: en
 status: true
 dependencies:
-  enforced:
-    module:
-      - islandora_demo_feature
   module:
     - islandora
-name: media
+name: fedora_media
-label: Media
+label: 'Fedora Media'
 group: Islandora
-description: 'All repository media'
+description: 'Reactions for media whose source is in Fedora'
 requireAllConditions: false
 disabled: false
 conditions:
-  is_media:
+  media_uses_filesystem:
-    id: is_media
+    id: media_uses_filesystem
+    filesystems:
+      fedora: fedora
     negate: 0
-    uuid: d43b2007-33d2-4503-b4a7-e3597f1e94de
+    uuid: 7754b373-7734-42ac-ba38-21b8574b60d6
     context_mapping:
       media: '@islandora.media_route_context_provider:media'
 reactions:
@@ -31,4 +30,8 @@ reactions:
     actions:
       delete_media_from_triplestore: delete_media_from_triplestore
     saved: false
+  islandora_map_uri_predicate:
+    id: islandora_map_uri_predicate
+    drupal_uri_predicate: 'schema:sameAs'
+    saved: false
 weight: 0

modules/islandora_demo_feature/config/install/context.context.files_in_fedora.yml

@@ -1,22 +1,21 @@
 langcode: en
 status: true
 dependencies:
-  enforced:
-    module:
-      - islandora_demo_feature
   module:
     - islandora
-name: files
+name: files_in_fedora
-label: Files
+label: 'Fedora Files'
 group: Islandora
-description: 'All repository files'
+description: 'Files in Fedora'
 requireAllConditions: false
 disabled: false
 conditions:
-  is_file:
+  file_uses_filesystem:
-    id: is_file
+    id: file_uses_filesystem
+    filesystems:
+      fedora: fedora
     negate: 0
-    uuid: 19b1b4e1-ea50-41f8-ab5b-8afb83eb5588
+    uuid: ea9d2661-2dc1-4480-bc9b-3fedeceba5f9
     context_mapping:
       file: '@islandora.file_route_context_provider:file'
 reactions:

modules/islandora_demo_feature/config/install/context.context.repository_content.yml

@@ -35,4 +35,8 @@ reactions:
       delete_node_from_fedora: delete_node_from_fedora
       delete_node_from_triplestore: delete_node_from_triplestore
     saved: false
+  islandora_map_uri_predicate:
+    id: islandora_map_uri_predicate
+    drupal_uri_predicate: 'schema:sameAs'
+    saved: false
 weight: 0

modules/islandora_demo_feature/config/install/context.context.taxonomy_terms.yml

@@ -13,10 +13,12 @@ description: 'All taxonomy terms'
 requireAllConditions: false
 disabled: false
 conditions:
-  is_term:
+  content_entity_type:
-    id: is_term
+    id: content_entity_type
+    types:
+      taxonomy_term: taxonomy_term
     negate: 0
-    uuid: 71ad4847-3f48-4b16-b355-364672bdfc49
+    uuid: cd01ce46-58a9-4d0e-8643-66f981b2c137
     context_mapping:
       taxonomy_term: '@islandora.taxonomy_term_route_context_provider:taxonomy_term'
 reactions:

modules/islandora_demo_feature/config/install/core.base_field_override.node.islandora_object.menu_link.yml

@@ -0,0 +1,19 @@
+langcode: en
+status: true
+dependencies:
+  config:
+    - node.type.islandora_object
+id: node.islandora_object.menu_link
+field_name: menu_link
+entity_type: node
+bundle: islandora_object
+label: 'Menu link'
+description: 'Computed menu link for the node (only available during node saving).'
+required: false
+translatable: false
+default_value: {  }
+default_value_callback: ''
+settings:
+  handler: default
+  handler_settings: {  }
+field_type: entity_reference

modules/islandora_demo_feature/config/install/core.base_field_override.node.islandora_object.title.yml

@@ -0,0 +1,17 @@
+langcode: en
+status: true
+dependencies:
+  config:
+    - node.type.islandora_object
+id: node.islandora_object.title
+field_name: title
+entity_type: node
+bundle: islandora_object
+label: Title
+description: ''
+required: true
+translatable: true
+default_value: {  }
+default_value_callback: ''
+settings: {  }
+field_type: string

modules/islandora_demo_feature/config/install/core.entity_form_display.media.audio.default.yml

@@ -75,6 +75,9 @@ content:
     weight: 7
     region: content
     third_party_settings: {  }
+  translation:
+    weight: 10
+    region: content
   uid:
     type: entity_reference_autocomplete
     weight: 4

modules/islandora_demo_feature/config/install/core.entity_form_display.media.file.default.yml

@@ -75,6 +75,9 @@ content:
     weight: 7
     region: content
     third_party_settings: {  }
+  translation:
+    weight: 10
+    region: content
   uid:
     type: entity_reference_autocomplete
     weight: 4

modules/islandora_demo_feature/config/install/core.entity_form_display.media.image.default.yml

@@ -79,6 +79,9 @@ content:
     weight: 7
     region: content
     third_party_settings: {  }
+  translation:
+    weight: 10
+    region: content
   uid:
     type: entity_reference_autocomplete
     weight: 4

modules/islandora_demo_feature/config/install/core.entity_form_display.media.video.default.yml

@@ -75,6 +75,9 @@ content:
     weight: 7
     region: content
     third_party_settings: {  }
+  translation:
+    weight: 10
+    region: content
   uid:
     type: entity_reference_autocomplete
     weight: 4

modules/islandora_demo_feature/config/install/core.entity_form_display.node.islandora_object.default.yml

@@ -90,6 +90,9 @@ content:
       size: 60
       placeholder: ''
     third_party_settings: {  }
+  translation:
+    weight: 10
+    region: content
   uid:
     type: entity_reference_autocomplete
     weight: 4

modules/islandora_demo_feature/config/install/language.content_settings.node.islandora_object.yml

@@ -8,6 +8,8 @@ dependencies:
 third_party_settings:
   content_translation:
     enabled: true
+    bundle_settings:
+      untranslatable_fields_hide: '0'
 id: node.islandora_object
 target_entity_type_id: node
 target_bundle: islandora_object

modules/islandora_demo_feature/config/install/system.action.generate_a_service_file_from_preservation_master.yml

@@ -17,3 +17,5 @@ configuration:
   derivative_term_uri: 'http://pcdm.org/use#ServiceFile'
   mimetype: image/jpeg
   args: ''
+  scheme: public
+  path: '[date:custom:Y]-[date:custom:m]/[node:nid]-[term:name].jpg'

modules/islandora_demo_feature/config/install/system.action.generate_a_thumbnail_from_an_image_service_file.yml

@@ -17,3 +17,5 @@ configuration:
   derivative_term_uri: 'http://pcdm.org/use#ThumbnailImage'
   mimetype: image/jpeg
   args: '-thumbnail 100x100'
+  scheme: public
+  path: '[date:custom:Y]-[date:custom:m]/[node:nid]-[term:name].jpg'

src/Controller/MediaSourceController.php

@@ -143,17 +143,7 @@ class MediaSourceController extends ControllerBase {
       throw new BadRequestHttpException("Missing Content-Type header");
     }
 
-    $content_disposition = $request->headers->get('Content-Disposition', "");
+    $content_location = $request->headers->get('Content-Location', "");
-
-    if (empty($content_disposition)) {
-      throw new BadRequestHttpException("Missing Content-Disposition header");
-    }
-
-    $matches = [];
-    if (!preg_match('/attachment; filename="(.*)"/', $content_disposition, $matches)) {
-      throw new BadRequestHttpException("Malformed Content-Disposition header");
-    }
-    $filename = $matches[1];
 
     // Since we create both a Media and its File,
     // start a transaction.
@@ -166,7 +156,7 @@ class MediaSourceController extends ControllerBase {
         $taxonomy_term,
         $request->getContent(TRUE),
         $content_type,
-        $filename
+        $content_location
       );
 
       // We return the media if it was newly created.

src/EventGenerator/EmitEvent.php

@@ -4,6 +4,7 @@ namespace Drupal\islandora\EventGenerator;
 
 use Drupal\Core\Access\AccessResult;
 use Drupal\Core\Action\ConfigurableActionBase;
+use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Entity\EntityTypeManager;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
@@ -160,7 +161,7 @@ abstract class EmitEvent extends ConfigurableActionBase implements ContainerFact
   /**
    * Override this function to control what gets encoded as a json note.
    */
-  protected function generateData($entity) {
+  protected function generateData(EntityInterface $entity) {
     return $this->configuration;
   }
 

src/EventGenerator/EventGenerator.php

@@ -21,6 +21,15 @@ class EventGenerator implements EventGeneratorInterface {
 
     $user_url = $user->toUrl()->setAbsolute()->toString();
 
+    if ($entity instanceof FileInterface) {
+      $entity_url = $entity->url();
+      $mimetype = $entity->getMimeType();
+    }
+    else {
+      $entity_url = $entity->toUrl()->setAbsolute()->toString();
+      $mimetype = 'text/html';
+    }
+
     $event = [
       "@context" => "https://www.w3.org/ns/activitystreams",
       "actor" => [
@@ -38,7 +47,15 @@ class EventGenerator implements EventGeneratorInterface {
       ],
       "object" => [
         "id" => "urn:uuid:{$entity->uuid()}",
-        "url" => $entity instanceof FileInterface ? $this->generateFileLinks($entity) : $this->generateRestLinks($entity),
+        "url" => [
+          [
+            "name" => "Canonical",
+            "type" => "Link",
+            "href" => $entity_url,
+            "mediaType" => $mimetype,
+            "rel" => "canonical",
+          ],
+        ],
       ],
     ];
 
@@ -53,6 +70,24 @@ class EventGenerator implements EventGeneratorInterface {
       $event["summary"] = ucfirst($data["event"]) . " a " . ucfirst($entity_type);
     }
 
+    // Add REST links for non-file entities.
+    if ($entity_type != 'file') {
+      $event['object']['url'][] = [
+        "name" => "JSON",
+        "type" => "Link",
+        "href" => "$entity_url?_format=json",
+        "mediaType" => "application/json",
+        "rel" => "alternate",
+      ];
+      $event['object']['url'][] = [
+        "name" => "JSONLD",
+        "type" => "Link",
+        "href" => "$entity_url?_format=jsonld",
+        "mediaType" => "application/ld+json",
+        "rel" => "alternate",
+      ];
+    }
+
     unset($data["event"]);
     unset($data["queue"]);
 
@@ -67,69 +102,4 @@ class EventGenerator implements EventGeneratorInterface {
     return json_encode($event);
   }
 
-  /**
-   * Generates file urls.
-   *
-   * @param \Drupal\file\FileInterface $file
-   *   The file.
-   *
-   * @return array
-   *   AS2 Links.
-   */
-  protected function generateFileLinks(FileInterface $file) {
-    $file_url = $file->url();
-    $checksum_url = Url::fromRoute('view.file_checksum.rest_export_1', ['file' => $file->id()])
-      ->setAbsolute()
-      ->toString();
-
-    return [
-      [
-        "name" => "File",
-        "type" => "Link",
-        "href" => "$file_url",
-        "mediaType" => $file->getMimeType(),
-      ],
-      [
-        "name" => "Checksum",
-        "type" => "Link",
-        "href" => "$checksum_url?_format=json",
-        "mediaType" => "application/json",
-      ],
-    ];
-  }
-
-  /**
-   * Generates REST urls.
-   *
-   * @param \Drupal\Core\Entity\EntityInterface $entity
-   *   The entity.
-   *
-   * @return array
-   *   AS2 Links.
-   */
-  protected function generateRestLinks(EntityInterface $entity) {
-    $url = $entity->toUrl()->setAbsolute()->toString();
-    return [
-        [
-          "name" => "Canoncial",
-          "type" => "Link",
-          "href" => "$url",
-          "mediaType" => "text/html",
-          "rel" => "canonical",
-        ],
-        [
-          "name" => "JSONLD",
-          "type" => "Link",
-          "href" => "$url?_format=jsonld",
-          "mediaType" => "application/ld+json",
-        ],
-        [
-          "name" => "JSON",
-          "type" => "Link",
-          "href" => "$url?_format=json",
-          "mediaType" => "application/json",
-        ],
-    ];
-  }
-
 }

src/Flysystem/Adapter/FedoraAdapter.php

@@ -0,0 +1,324 @@
+<?php
+
+namespace Drupal\islandora\Flysystem\Adapter;
+
+use Islandora\Chullo\IFedoraApi;
+use League\Flysystem\AdapterInterface;
+use League\Flysystem\Adapter\Polyfill\NotSupportingVisibilityTrait;
+use League\Flysystem\Adapter\Polyfill\StreamedCopyTrait;
+use League\Flysystem\Config;
+use GuzzleHttp\Psr7;
+use GuzzleHttp\Psr7\Response;
+use GuzzleHttp\Psr7\StreamWrapper;
+use Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesserInterface;
+
+/**
+ * Fedora adapter for Flysystem.
+ */
+class FedoraAdapter implements AdapterInterface {
+
+  use StreamedCopyTrait;
+  use NotSupportingVisibilityTrait;
+
+  protected $fedora;
+  protected $mimeTypeGuesser;
+
+  /**
+   * Constructs a Fedora adapter for Flysystem.
+   *
+   * @param \Islandora\Chullo\IFedoraApi $fedora
+   *   Fedora client.
+   * @param \Symfony\Component\HttpFoundation\File\Mimetype\MimeTypeGuesserInterface $mime_type_guesser
+   *   Mimetype guesser.
+   */
+  public function __construct(IFedoraApi $fedora, MimeTypeGuesserInterface $mime_type_guesser) {
+    $this->fedora = $fedora;
+    $this->mimeTypeGuesser = $mime_type_guesser;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function has($path) {
+    $response = $this->fedora->getResourceHeaders($path);
+    return $response->getStatusCode() == 200;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function read($path) {
+    $meta = $this->readStream($path);
+
+    if (!$meta) {
+      return FALSE;
+    }
+
+    if (isset($meta['stream'])) {
+      $meta['contents'] = stream_get_contents($meta['stream']);
+      fclose($meta['stream']);
+      unset($meta['stream']);
+    }
+
+    return $meta;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function readStream($path) {
+    $response = $this->fedora->getResource($path);
+
+    if ($response->getStatusCode() != 200) {
+      return FALSE;
+    }
+
+    $meta = $this->getMetadataFromHeaders($response);
+    $meta['path'] = $path;
+
+    if ($meta['type'] == 'file') {
+      $meta['stream'] = StreamWrapper::getResource($response->getBody());
+    }
+
+    return $meta;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getMetadata($path) {
+    $response = $this->fedora->getResourceHeaders($path);
+
+    if ($response->getStatusCode() != 200) {
+      return FALSE;
+    }
+
+    $meta = $this->getMetadataFromHeaders($response);
+    $meta['path'] = $path;
+    return $meta;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getSize($path) {
+    return $this->getMetadata($path);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getMimetype($path) {
+    return $this->getMetadata($path);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getTimestamp($path) {
+    return $this->getMetadata($path);
+  }
+
+  /**
+   * Gets metadata from response headers.
+   *
+   * @param \GuzzleHttp\Psr7\Response $response
+   *   Response.
+   */
+  protected function getMetadataFromHeaders(Response $response) {
+    $last_modified = \DateTime::createFromFormat(
+        \DateTime::RFC1123,
+        $response->getHeader('Last-Modified')[0]
+    );
+
+    // NonRDFSource's are considered files.  Everything else is a
+    // directory.
+    $type = 'dir';
+    $links = Psr7\parse_header($response->getHeader('Link'));
+    foreach ($links as $link) {
+      if ($link['rel'] == 'type' && $link[0] == '<http://www.w3.org/ns/ldp#NonRDFSource>') {
+        $type = 'file';
+        break;
+      }
+    }
+
+    $meta = [
+      'type' => $type,
+      'timestamp' => $last_modified->getTimestamp(),
+    ];
+
+    if ($type == 'file') {
+      $meta['size'] = $response->getHeader('Content-Length')[0];
+      $meta['mimetype'] = $response->getHeader('Content-Type')[0];
+    }
+
+    return $meta;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function listContents($directory = '', $recursive = FALSE) {
+    // Strip leading and trailing whitespace and /'s.
+    $normalized = trim($directory, ' \t\n\r\0\x0B/');
+
+    // Exit early if it's a file.
+    $meta = $this->getMetadata($normalized);
+    if ($meta['type'] == 'file') {
+      return [];
+    }
+    // Get the resource from Fedora.
+    $response = $this->fedora->getResource($normalized, ['Accept' => 'application/ld+json']);
+    $jsonld = (string) $response->getBody();
+    $graph = json_decode($jsonld, TRUE);
+
+    $uri = $this->fedora->getBaseUri() . $normalized;
+
+    // Hack it out of the graph.
+    // There may be more than one resource returned.
+    $resource = [];
+    foreach ($graph as $elem) {
+      if (isset($elem['@id']) && $elem['@id'] == $uri) {
+        $resource = $elem;
+        break;
+      }
+    }
+
+    // Exit early if resource doesn't contain other resources.
+    if (!isset($resource['http://www.w3.org/ns/ldp#contains'])) {
+      return [];
+    }
+
+    // Collapse uris to a single array.
+    $contained = array_map(
+        function ($elem) {
+            return $elem['@id'];
+        },
+        $resource['http://www.w3.org/ns/ldp#contains']
+    );
+
+    // Exit early if not recursive.
+    if (!$recursive) {
+      // Transform results to their flysystem metadata.
+      return array_map(
+        [$this, 'transformToMetadata'],
+        $contained
+      );
+    }
+
+    // Recursively get containment for ancestors.
+    $ancestors = [];
+
+    foreach ($contained as $child_uri) {
+      $child_directory = explode($this->fedora->getBaseUri(), $child_uri)[1];
+      $ancestors = array_merge($this->listContents($child_directory, $recursive), $ancestors);
+    }
+
+    // // Transform results to their flysystem metadata.
+    return array_map(
+        [$this, 'transformToMetadata'],
+        array_merge($ancestors, $contained)
+    );
+  }
+
+  /**
+   * Normalizes data for listContents().
+   *
+   * @param string $uri
+   *   Uri.
+   */
+  protected function transformToMetadata($uri) {
+    if (is_array($uri)) {
+      return $uri;
+    }
+    $exploded = explode($this->fedora->getBaseUri(), $uri);
+    return $this->getMetadata($exploded[1]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function write($path, $contents, Config $config) {
+    $headers = [
+      'Content-Type' => $this->mimeTypeGuesser->guess($path),
+    ];
+
+    $response = $this->fedora->saveResource(
+        $path,
+        $contents,
+        $headers
+    );
+
+    $code = $response->getStatusCode();
+    if (!in_array($code, [201, 204])) {
+      return FALSE;
+    }
+
+    return $this->getMetadata($path);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function writeStream($path, $contents, Config $config) {
+    return $this->write($path, $contents, $config);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function update($path, $contents, Config $config) {
+    return $this->write($path, $contents, $config);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function updateStream($path, $contents, Config $config) {
+    return $this->write($path, $contents, $config);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function delete($path) {
+    $response = $this->fedora->deleteResource($path);
+
+    $code = $response->getStatusCode();
+    return in_array($code, [204, 404]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function deleteDir($dirname) {
+    return $this->delete($dirname);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function rename($path, $newpath) {
+    if ($this->copy($path, $newpath)) {
+      return $this->delete($path);
+    }
+    return FALSE;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function createDir($dirname, Config $config) {
+    $response = $this->fedora->saveResource(
+        $dirname
+    );
+
+    $code = $response->getStatusCode();
+    if (!in_array($code, [201, 204])) {
+      return FALSE;
+    }
+
+    return $this->getMetadata($dirname);
+  }
+
+}

src/Flysystem/Fedora.php

@@ -0,0 +1,124 @@
+<?php
+
+namespace Drupal\islandora\Flysystem;
+
+use Drupal\Core\Logger\RfcLogLevel;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\flysystem\Plugin\FlysystemPluginInterface;
+use Drupal\flysystem\Plugin\FlysystemUrlTrait;
+use Drupal\islandora\Flysystem\Adapter\FedoraAdapter;
+use GuzzleHttp\HandlerStack;
+use GuzzleHttp\Client;
+use Islandora\Chullo\IFedoraApi;
+use Islandora\Chullo\FedoraApi;
+use Psr\Http\Message\RequestInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesserInterface;
+
+/**
+ * Drupal plugin for the Fedora Flysystem adapter.
+ *
+ * @Adapter(id = "fedora")
+ */
+class Fedora implements FlysystemPluginInterface, ContainerFactoryPluginInterface {
+
+  use FlysystemUrlTrait;
+
+  protected $fedora;
+
+  protected $mimeTypeGuesser;
+
+  /**
+   * Constructs a Fedora plugin for Flysystem.
+   *
+   * @param \Islandora\Chullo\IFedoraApi $fedora
+   *   Fedora client.
+   * @param \Symfony\Component\HttpFoundation\File\Mimetype\MimeTypeGuesserInterface $mime_type_guesser
+   *   Mimetype guesser.
+   */
+  public function __construct(
+    IFedoraApi $fedora,
+    MimeTypeGuesserInterface $mime_type_guesser
+  ) {
+    $this->fedora = $fedora;
+    $this->mimeTypeGuesser = $mime_type_guesser;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    // Construct Authorization header using jwt token.
+    $jwt = $container->get('jwt.authentication.jwt');
+    $auth = 'Bearer ' . $jwt->generateToken();
+
+    // Construct guzzle client to middleware that adds the header.
+    $stack = HandlerStack::create();
+    $stack->push(static::addHeader('Authorization', $auth));
+    $client = new Client([
+      'handler' => $stack,
+      'base_uri' => $configuration['root'],
+    ]);
+    $fedora = new FedoraApi($client);
+
+    // Return it.
+    return new static(
+      $fedora,
+      $container->get('file.mime_type.guesser')
+    );
+  }
+
+  /**
+   * Guzzle middleware to add a header to outgoing requests.
+   *
+   * @param string $header
+   *   Header name.
+   * @param string $value
+   *   Header value.
+   */
+  public static function addHeader($header, $value) {
+    return function (callable $handler) use ($header, $value) {
+      return function (
+        RequestInterface $request,
+        array $options
+      ) use (
+$handler,
+ $header,
+ $value
+) {
+        $request = $request->withHeader($header, $value);
+        return $handler($request, $options);
+      };
+    };
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getAdapter() {
+    return new FedoraAdapter($this->fedora, $this->mimeTypeGuesser);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function ensure($force = FALSE) {
+    // Check fedora root for sanity.
+    $response = $this->fedora->getResourceHeaders('');
+
+    if ($response->getStatusCode() != 200) {
+      return [[
+        'severity' => RfcLogLevel::ERROR,
+        'message' => '%url returned %status',
+        'context' => [
+          '%url' => $this->fedora->getBaseUri(),
+          '%status' => $response->getStatusCode(),
+        ],
+      ],
+      ];
+    }
+
+    return [];
+  }
+
+}

src/IslandoraUtils.php

@@ -7,8 +7,9 @@ use Drupal\Core\Entity\ContentEntityInterface;
 use Drupal\Core\Entity\EntityFieldManager;
 use Drupal\Core\Entity\EntityTypeManager;
 use Drupal\Core\Entity\Query\QueryFactory;
-use Drupal\Core\StreamWrapper\StreamWrapperManager;
+use Drupal\Core\Site\Settings;
 use Drupal\file\FileInterface;
+use Drupal\flysystem\FlysystemFactory;
 use Drupal\islandora\ContextProvider\NodeContextProvider;
 use Drupal\islandora\ContextProvider\MediaContextProvider;
 use Drupal\islandora\ContextProvider\FileContextProvider;
@@ -55,11 +56,11 @@ class IslandoraUtils {
   protected $contextManager;
 
   /**
-   * Stream wrapper manager.
+   * Flysystem factory.
    *
-   * @var \Drupal\Core\StreamWrapper\StreamWrapperManager
+   * @var \Drupal\flysystem\FlysystemFactory
    */
-  protected $streamWrapperManager;
+  protected $flysystemFactory;
 
   /**
    * Constructor.
@@ -72,21 +73,21 @@ class IslandoraUtils {
    *   Entity query.
    * @param \Drupal\context\ContextManager $context_manager
    *   Context manager.
-   * @param \Drupal\Core\StreamWrapper\StreamWrapperManager $stream_wrapper_manager
+   * @param \Drupal\flysystem\FlysystemFactory $flysystem_factory
-   *   Stream wrapper manager.
+   *   Flysystem factory.
    */
   public function __construct(
     EntityTypeManager $entity_type_manager,
     EntityFieldManager $entity_field_manager,
     QueryFactory $entity_query,
     ContextManager $context_manager,
-    StreamWrapperManager $stream_wrapper_manager
+    FlysystemFactory $flysystem_factory
   ) {
     $this->entityTypeManager = $entity_type_manager;
     $this->entityFieldManager = $entity_field_manager;
     $this->entityQuery = $entity_query;
     $this->contextManager = $context_manager;
-    $this->streamWrapperManager = $stream_wrapper_manager;
+    $this->flysystemFactory = $flysystem_factory;
   }
 
   /**
@@ -367,4 +368,18 @@ class IslandoraUtils {
     return FALSE;
   }
 
+  /**
+   * Returns a list of all available filesystem schemes.
+   *
+   * @return String[]
+   *   List of all available filesystem schemes.
+   */
+  public function getFilesystemSchemes() {
+    $schemes = ['public'];
+    if (!empty(Settings::get('file_private_path'))) {
+      $schemes[] = 'private';
+    }
+    return array_merge($schemes, $this->flysystemFactory->getSchemes());
+  }
+
 }

src/MediaSource/MediaSourceService.php

@@ -2,13 +2,11 @@
 
 namespace Drupal\islandora\MediaSource;
 
-use Drupal\Component\Render\PlainTextOutput;
 use Drupal\Core\Entity\EntityTypeManager;
 use Drupal\Core\Entity\Query\QueryFactory;
+use Drupal\Core\File\FileSystem;
 use Drupal\Core\Language\LanguageManagerInterface;
 use Drupal\Core\Session\AccountInterface;
-use Drupal\Core\StreamWrapper\StreamWrapperManager;
-use Drupal\Core\Utility\Token;
 use Drupal\file\FileInterface;
 use Drupal\media\MediaInterface;
 use Drupal\media\MediaTypeInterface;
@@ -37,13 +35,6 @@ class MediaSourceService {
    */
   protected $account;
 
-  /**
-   * Stream wrapper manager.
-   *
-   * @var \Drupal\Core\StreamWrapper\StreamWrapperManager
-   */
-  protected $streamWrapperManager;
-
   /**
    * Language manager.
    *
@@ -52,18 +43,18 @@ class MediaSourceService {
   protected $languageManager;
 
   /**
-   * Token service.
+   * Entity query.
    *
-   * @var \Drupal\Core\Utility\Token
+   * @var \Drupal\Core\Entity\Query\QueryFactory
    */
-  protected $token;
+  protected $entityQuery;
 
   /**
-   * Entity query.
+   * File system service.
    *
-   * @var \Drupal\Core\Entity\Query\QueryFactory
+   * @var \Drupal\Core\File\FileSystem
    */
-  protected $entityQuery;
+  protected $fileSystem;
 
   /**
    * Constructor.
@@ -72,29 +63,25 @@ class MediaSourceService {
    *   The entity type manager.
    * @param \Drupal\Core\Session\AccountInterface $account
    *   The current user.
-   * @param \Drupal\Core\StreamWrapper\StreamWrapperManager $stream_wrapper_manager
-   *   Stream wrapper manager.
    * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
    *   Language manager.
-   * @param \Drupal\Core\Utility\Token $token
-   *   Token service.
    * @param \Drupal\Core\Entity\Query\QueryFactory $entity_query
    *   Entity query.
+   * @param \Drupal\Core\File\FileSystem $file_system
+   *   File system service.
    */
   public function __construct(
     EntityTypeManager $entity_type_manager,
     AccountInterface $account,
-    StreamWrapperManager $stream_wrapper_manager,
     LanguageManagerInterface $language_manager,
-    Token $token,
+    QueryFactory $entity_query,
-    QueryFactory $entity_query
+    FileSystem $file_system
   ) {
     $this->entityTypeManager = $entity_type_manager;
     $this->account = $account;
-    $this->streamWrapperManager = $stream_wrapper_manager;
     $this->languageManager = $language_manager;
-    $this->token = $token;
     $this->entityQuery = $entity_query;
+    $this->fileSystem = $file_system;
   }
 
   /**
@@ -120,6 +107,32 @@ class MediaSourceService {
     return $type_configuration['source_field'];
   }
 
+  /**
+   * Gets the value of a source field for a Media.
+   *
+   * @param \Drupal\media\MediaInterface $media
+   *   Media whose source field you are searching for.
+   *
+   * @return \Drupal\file\FileInterface
+   *   File if it exists
+   *
+   * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
+   */
+  public function getSourceFile(MediaInterface $media) {
+    // Get the source field for the media type.
+    $source_field = $this->getSourceFieldName($media->bundle());
+
+    if (empty($source_field)) {
+      throw new NotFoundHttpException("Source field not set for {$media->bundle()} media");
+    }
+
+    // Get the file from the media.
+    $files = $media->get($source_field)->referencedEntities();
+    $file = reset($files);
+
+    return $file;
+  }
+
   /**
    * Updates a media's source field with the supplied resource.
    *
@@ -137,25 +150,19 @@ class MediaSourceService {
     $resource,
     $mimetype
   ) {
-    // Get the source field for the media type.
     $source_field = $this->getSourceFieldName($media->bundle());
-
+    $file = $this->getSourceFile($media);
-    if (empty($source_field)) {
-      throw new NotFoundHttpException("Source field not set for {$media->bundle()} media");
-    }
-
-    // Get the file from the media.
-    $files = $media->get($source_field)->referencedEntities();
-    $file = reset($files);
 
     // Update it.
     $this->updateFile($file, $resource, $mimetype);
+    $file->save();
 
     // Set fields provided by type plugin and mapped in bundle configuration
     // for the media.
     foreach ($media->bundle->entity->getFieldMap() as $source => $destination) {
       if ($media->hasField($destination) && $value = $media->getSource()->getMetadata($media, $source)) {
         $media->set($destination, $value);
+      }
       // Ensure width and height are updated on File reference when it's an
       // image. Otherwise you run into scaling problems when updating images
       // with different sizes.
@@ -163,7 +170,6 @@ class MediaSourceService {
         $media->get($source_field)->first()->set($source, $value);
       }
     }
-    }
 
     $media->save();
   }
@@ -180,11 +186,13 @@ class MediaSourceService {
    */
   protected function updateFile(FileInterface $file, $resource, $mimetype = NULL) {
     $uri = $file->getFileUri();
-    $file_stream_wrapper = $this->streamWrapperManager->getViaUri($uri);
+
-    $path = "";
+    $destination = fopen($uri, 'wb');
-    $file_stream_wrapper->stream_open($uri, 'w', STREAM_REPORT_ERRORS, $path);
+    if (!$destination) {
-    $file_stream = $file_stream_wrapper->stream_cast(STREAM_CAST_AS_STREAM);
+      throw new HttpException(500, "File $uri could not be opened to write.");
-    $content_length = stream_copy_to_stream($resource, $file_stream);
+    }
+
+    $content_length = stream_copy_to_stream($resource, $destination);
 
     if ($content_length === FALSE) {
       throw new HttpException(500, "Request body could not be copied to $uri");
@@ -192,8 +200,8 @@ class MediaSourceService {
 
     if ($content_length === 0) {
       // Clean up the newly created, empty file.
-      $file_stream_wrapper->unlink($uri);
+      unlink($uri);
-      throw new BadRequestHttpException("The request contents are empty.");
+      throw new HttpException(400, "No bytes were copied to $uri");
     }
 
     if (!empty($mimetype)) {
@@ -217,8 +225,8 @@ class MediaSourceService {
    *   New file contents as a resource.
    * @param string $mimetype
    *   New mimetype of contents.
-   * @param string $filename
+   * @param string $content_location
-   *   New filename for contents.
+   *   Drupal/PHP stream wrapper for where to upload the binary.
    *
    * @throws HttpException
    */
@@ -228,9 +236,8 @@ class MediaSourceService {
     TermInterface $taxonomy_term,
     $resource,
     $mimetype,
-    $filename
+    $content_location
   ) {
-
     $existing = $this->entityQuery->get('media')
       ->condition('field_media_of', $node->id())
       ->condition('field_tags', $taxonomy_term->id())
@@ -256,22 +263,11 @@ class MediaSourceService {
         throw new NotFoundHttpException("Source field not set for $bundle media");
       }
 
-      // Load its config to get file extensions and upload path.
-      $source_field_config = $this->entityTypeManager->getStorage('field_config')->load("media.$bundle.$source_field");
-
-      // Construct the destination uri.
-      $directory = $source_field_config->getSetting('file_directory');
-      $directory = trim($directory, '/');
-      $directory = PlainTextOutput::renderFromHtml($this->token->replace($directory, ['node' => $node]));
-      $scheme = file_default_scheme();
-      $destination_directory = "$scheme://$directory";
-      $destination = "$destination_directory/$filename";
-
       // Construct the File.
       $file = $this->entityTypeManager->getStorage('file')->create([
         'uid' => $this->account->id(),
-        'uri' => $destination,
+        'uri' => $content_location,
-        'filename' => $filename,
+        'filename' => $this->fileSystem->basename($content_location),
         'filemime' => $mimetype,
         'status' => FILE_STATUS_PERMANENT,
       ]);
@@ -285,7 +281,8 @@ class MediaSourceService {
         throw new BadRequestHttpException("Invalid file extension.  Valid types are $valid_extensions");
       }
 
-      if (!file_prepare_directory($destination_directory, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS)) {
+      $directory = $this->fileSystem->dirname($content_location);
+      if (!file_prepare_directory($directory, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS)) {
         throw new HttpException(500, "The destination directory does not exist, could not be created, or is not writable");
       }
 
@@ -297,7 +294,7 @@ class MediaSourceService {
       $media_struct = [
         'bundle' => $bundle,
         'uid' => $this->account->id(),
-        'name' => $filename,
+        'name' => $file->getFilename(),
         'langcode' => $this->languageManager->getDefaultLanguage()->getId(),
         "$source_field" => [
           'target_id' => $file->id(),
@@ -312,7 +309,7 @@ class MediaSourceService {
 
       // Set alt text.
       if ($source_field_config->getSetting('alt_field') && $source_field_config->getSetting('alt_field_required')) {
-        $media_struct[$source_field]['alt'] = $filename;
+        $media_struct[$source_field]['alt'] = $file->getFilename;
       }
 
       $media = $this->entityTypeManager->getStorage('media')->create($media_struct);

src/Plugin/Action/EmitFileEvent.php

@@ -2,7 +2,16 @@
 
 namespace Drupal\islandora\Plugin\Action;
 
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Entity\EntityTypeManager;
+use Drupal\Core\File\FileSystem;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Site\Settings;
+use Drupal\jwt\Authentication\Provider\JwtAuth;
 use Drupal\islandora\EventGenerator\EmitEvent;
+use Drupal\islandora\EventGenerator\EventGeneratorInterface;
+use Stomp\StatefulStomp;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
  * Emits a File event.
@@ -13,4 +22,91 @@ use Drupal\islandora\EventGenerator\EmitEvent;
  *   type = "file"
  * )
  */
-class EmitFileEvent extends EmitEvent {}
+class EmitFileEvent extends EmitEvent {
+
+  /**
+   * File system service.
+   *
+   * @var \Drupal\Core\File\FileSystem
+   */
+  protected $fileSystem;
+
+  /**
+   * Constructs a EmitEvent action.
+   *
+   * @param array $configuration
+   *   A configuration array containing information about the plugin instance.
+   * @param string $plugin_id
+   *   The plugin_id for the plugin instance.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param \Drupal\Core\Session\AccountInterface $account
+   *   Current user.
+   * @param \Drupal\Core\Entity\EntityTypeManager $entity_type_manager
+   *   Entity type manager.
+   * @param \Drupal\islandora\EventGenerator\EventGeneratorInterface $event_generator
+   *   EventGenerator service to serialize AS2 events.
+   * @param \Stomp\StatefulStomp $stomp
+   *   Stomp client.
+   * @param \Drupal\jwt\Authentication\Provider\JwtAuth $auth
+   *   JWT Auth client.
+   * @param \Drupal\Core\File\FileSystem $file_system
+   *   File system service.
+   */
+  public function __construct(
+    array $configuration,
+    $plugin_id,
+    $plugin_definition,
+    AccountInterface $account,
+    EntityTypeManager $entity_type_manager,
+    EventGeneratorInterface $event_generator,
+    StatefulStomp $stomp,
+    JwtAuth $auth,
+    FileSystem $file_system
+  ) {
+    parent::__construct(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $account,
+      $entity_type_manager,
+      $event_generator,
+      $stomp,
+      $auth
+    );
+    $this->fileSystem = $file_system;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $container->get('current_user'),
+      $container->get('entity_type.manager'),
+      $container->get('islandora.eventgenerator'),
+      $container->get('islandora.stomp'),
+      $container->get('jwt.authentication.jwt'),
+      $container->get('file_system')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function generateData(EntityInterface $entity) {
+    $uri = $entity->getFileUri();
+    $scheme = $this->fileSystem->uriScheme($uri);
+    $flysystem_config = Settings::get('flysystem');
+
+    $data = parent::generateData($entity);
+    if (isset($flysystem_config[$scheme]) && $flysystem_config[$scheme]['driver'] == 'fedora') {
+      $data['fedora_uri'] = str_replace("$scheme://", $flysystem_config[$scheme]['config']['root'], $uri);
+    }
+    return $data;
+  }
+
+}

src/Plugin/Action/EmitMediaEvent.php

@@ -2,7 +2,15 @@
 
 namespace Drupal\islandora\Plugin\Action;
 
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Entity\EntityTypeManager;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\jwt\Authentication\Provider\JwtAuth;
 use Drupal\islandora\EventGenerator\EmitEvent;
+use Drupal\islandora\EventGenerator\EventGeneratorInterface;
+use Drupal\islandora\MediaSource\MediaSourceService;
+use Stomp\StatefulStomp;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
  * Emits a Media event.
@@ -13,4 +21,85 @@ use Drupal\islandora\EventGenerator\EmitEvent;
  *   type = "media"
  * )
  */
-class EmitMediaEvent extends EmitEvent {}
+class EmitMediaEvent extends EmitEvent {
+
+  /**
+   * Media source service.
+   *
+   * @var \Drupal\islandora\MediaSource\MediaSourceService
+   */
+  protected $mediaSource;
+
+  /**
+   * Constructs a EmitEvent action.
+   *
+   * @param array $configuration
+   *   A configuration array containing information about the plugin instance.
+   * @param string $plugin_id
+   *   The plugin_id for the plugin instance.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param \Drupal\Core\Session\AccountInterface $account
+   *   Current user.
+   * @param \Drupal\Core\Entity\EntityTypeManager $entity_type_manager
+   *   Entity type manager.
+   * @param \Drupal\islandora\EventGenerator\EventGeneratorInterface $event_generator
+   *   EventGenerator service to serialize AS2 events.
+   * @param \Stomp\StatefulStomp $stomp
+   *   Stomp client.
+   * @param \Drupal\jwt\Authentication\Provider\JwtAuth $auth
+   *   JWT Auth client.
+   * @param \Drupal\islandora\MediaSource\MediaSourceService $media_source
+   *   Media source service.
+   */
+  public function __construct(
+    array $configuration,
+    $plugin_id,
+    $plugin_definition,
+    AccountInterface $account,
+    EntityTypeManager $entity_type_manager,
+    EventGeneratorInterface $event_generator,
+    StatefulStomp $stomp,
+    JwtAuth $auth,
+    MediaSourceService $media_source
+  ) {
+    parent::__construct(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $account,
+      $entity_type_manager,
+      $event_generator,
+      $stomp,
+      $auth
+    );
+    $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('current_user'),
+      $container->get('entity_type.manager'),
+      $container->get('islandora.eventgenerator'),
+      $container->get('islandora.stomp'),
+      $container->get('jwt.authentication.jwt'),
+      $container->get('islandora.media_source_service')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function generateData(EntityInterface $entity) {
+    $data = parent::generateData($entity);
+    $data['source_field'] = $this->mediaSource->getSourceFieldName($entity->bundle());
+    return $data;
+  }
+
+}

src/Plugin/Condition/ContentEntityType.php

@@ -0,0 +1,105 @@
+<?php
+
+namespace Drupal\islandora\Plugin\Condition;
+
+use Drupal\Core\Condition\ConditionPluginBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Provides a 'Content Entity Type' condition.
+ *
+ * @Condition(
+ *   id = "content_entity_type",
+ *   label = @Translation("Content Entity Type"),
+ *   context = {
+ *     "node" = @ContextDefinition("entity:node", required = FALSE, label = @Translation("Node")),
+ *     "media" = @ContextDefinition("entity:media", required = FALSE, label = @Translation("Media")),
+ *     "file" = @ContextDefinition("entity:file", required = FALSE, label = @Translation("File")),
+ *     "taxonomy_term" = @ContextDefinition("entity:taxonomy_term", required = FALSE, label = @Translation("Term"))
+ *   }
+ * )
+ */
+class ContentEntityType extends ConditionPluginBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
+    $form['types'] = [
+      '#title' => $this->t('Content Entity Types'),
+      '#type' => 'checkboxes',
+      '#options' => [
+        'node' => $this->t('Node'),
+        'media' => $this->t('Media'),
+        'file' => $this->t('File'),
+        'taxonomy_term' => $this->t('Taxonomy Term'),
+      ],
+      '#default_value' => $this->configuration['types'],
+    ];
+    return parent::buildConfigurationForm($form, $form_state);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
+    $this->configuration['types'] = array_filter($form_state->getValue('types'));
+    parent::submitConfigurationForm($form, $form_state);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function evaluate() {
+    if (empty($this->configuration['types']) && !$this->isNegated()) {
+      return TRUE;
+    }
+
+    foreach ($this->configuration['types'] as $type) {
+      if ($this->getContext($type)->hasContextValue()) {
+        $entity = $this->getContextValue($type);
+        if ($entity && $entity->getEntityTypeId() == $type) {
+          return TRUE;
+        }
+      }
+    }
+
+    return FALSE;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function summary() {
+    if (count($this->configuration['types']) > 1) {
+      $types = $this->configuration['types'];
+      $last = array_pop($types);
+      $types = implode(', ', $types);
+      return $this->t(
+        'The content entity is a @types or @last',
+        [
+          '@types' => $types,
+          '@last' => $last,
+        ]
+      );
+    }
+    $type = reset($this->configuration['types']);
+    return $this->t(
+      'The content entity is a @type',
+      [
+        '@type' => $type,
+      ]
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultConfiguration() {
+    return array_merge(
+      ['types' => []],
+      parent::defaultConfiguration()
+    );
+  }
+
+}

src/Plugin/Condition/FileUsesFilesystem.php

@@ -0,0 +1,168 @@
+<?php
+
+namespace Drupal\islandora\Plugin\Condition;
+
+use Drupal\Core\Condition\ConditionPluginBase;
+use Drupal\Core\File\FileSystem;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\file\FileInterface;
+use Drupal\islandora\IslandoraUtils;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a condition to filter media based on where its source file resides.
+ *
+ * @Condition(
+ *   id = "file_uses_filesystem",
+ *   label = @Translation("File uses filesystem"),
+ *   context = {
+ *     "file" = @ContextDefinition("entity:file", required = TRUE , label = @Translation("file"))
+ *   }
+ * )
+ */
+class FileUsesFilesystem extends ConditionPluginBase implements ContainerFactoryPluginInterface {
+
+  /**
+   * Islandora utility functions.
+   *
+   * @var \Drupal\islandora\IslandoraUtils
+   */
+  protected $utils;
+
+  /**
+   * File system service.
+   *
+   * @var \Drupal\Core\File\FileSystem
+   */
+  protected $fileSystem;
+
+  /**
+   * 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\File\FileSystem $file_system
+   *   File system service.
+   */
+  public function __construct(
+    array $configuration,
+    $plugin_id,
+    $plugin_definition,
+    IslandoraUtils $utils,
+    FileSystem $file_system
+  ) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+    $this->utils = $utils;
+    $this->fileSystem = $file_system;
+  }
+
+  /**
+   * {@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('file_system')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
+    $schemes = $this->utils->getFilesystemSchemes();
+    $options = array_combine($schemes, $schemes);
+
+    $form['filesystems'] = [
+      '#title' => $this->t('Filesystems'),
+      '#type' => 'checkboxes',
+      '#options' => $options,
+      '#default_value' => $this->configuration['filesystems'],
+    ];
+    return parent::buildConfigurationForm($form, $form_state);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
+    $this->configuration['filesystems'] = array_filter($form_state->getValue('filesystems'));
+    parent::submitConfigurationForm($form, $form_state);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function summary() {
+    if (count($this->configuration['filesystems']) > 1) {
+      $filesystems = $this->configuration['filesystems'];
+      $last = array_pop($filesystems);
+      $filesystems = implode(', ', $filesystems);
+      return $this->t(
+        'The file uses @filesystems or @last',
+        [
+          '@filesystems' => $filesystems,
+          '@last' => $last,
+        ]
+      );
+    }
+    $filesystem = reset($this->configuration['filesystems']);
+    return $this->t(
+      'The file uses @filesystem',
+      [
+        '@filesystem' => $filesystem,
+      ]
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function evaluate() {
+    if (empty($this->configuration['filesystems']) && !$this->isNegated()) {
+      return TRUE;
+    }
+
+    $file = $this->getContextValue('file');
+    return $this->evaluateFile($file);
+  }
+
+  /**
+   * The actual evaluate function.
+   *
+   * @param \Drupal\file\FileInterface $file
+   *   File.
+   *
+   * @return bool
+   *   TRUE on success.
+   */
+  protected function evaluateFile(FileInterface $file) {
+    $uri = $file->getFileUri();
+    $scheme = $this->fileSystem->uriScheme($uri);
+    return !empty($this->configuration['filesystems'][$scheme]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultConfiguration() {
+    return array_merge(
+      ['filesystems' => []],
+      parent::defaultConfiguration()
+    );
+  }
+
+}

src/Plugin/Condition/IsFile.php

@@ -1,35 +0,0 @@
-<?php
-
-namespace Drupal\islandora\Plugin\Condition;
-
-use Drupal\Core\Condition\ConditionPluginBase;
-use Drupal\file\FileInterface;
-
-/**
- * Provides an 'Is File' condition.
- *
- * @Condition(
- *   id = "is_file",
- *   label = @Translation("Is File"),
- *   context = {
- *     "file" = @ContextDefinition("entity:file", label = @Translation("File"))
- *   }
- * )
- */
-class IsFile extends ConditionPluginBase {
-
-  /**
-   * {@inheritdoc}
-   */
-  public function summary() {
-    return $this->t('The entity is a File');
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function evaluate() {
-    return $this->getContextValue('file') instanceof FileInterface;
-  }
-
-}

src/Plugin/Condition/IsMedia.php

@@ -1,35 +0,0 @@
-<?php
-
-namespace Drupal\islandora\Plugin\Condition;
-
-use Drupal\Core\Condition\ConditionPluginBase;
-use Drupal\media\MediaInterface;
-
-/**
- * Provides an 'Is Media' condition.
- *
- * @Condition(
- *   id = "is_media",
- *   label = @Translation("Is Media"),
- *   context = {
- *     "media" = @ContextDefinition("entity:media", label = @Translation("Media"))
- *   }
- * )
- */
-class IsMedia extends ConditionPluginBase {
-
-  /**
-   * {@inheritdoc}
-   */
-  public function summary() {
-    return $this->t('The entity is a Media');
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function evaluate() {
-    return $this->getContextValue('media') instanceof MediaInterface;
-  }
-
-}

src/Plugin/Condition/IsNode.php

@@ -1,35 +0,0 @@
-<?php
-
-namespace Drupal\islandora\Plugin\Condition;
-
-use Drupal\Core\Condition\ConditionPluginBase;
-use Drupal\node\NodeInterface;
-
-/**
- * Provides an 'Is Node' condition.
- *
- * @Condition(
- *   id = "is_node",
- *   label = @Translation("Is Node"),
- *   context = {
- *     "node" = @ContextDefinition("entity:node", label = @Translation("Node"))
- *   }
- * )
- */
-class IsNode extends ConditionPluginBase {
-
-  /**
-   * {@inheritdoc}
-   */
-  public function summary() {
-    return $this->t('The entity is a Node');
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function evaluate() {
-    return $this->getContextValue('node') instanceof NodeInterface;
-  }
-
-}

src/Plugin/Condition/IsTerm.php

@@ -1,43 +0,0 @@
-<?php
-
-namespace Drupal\islandora\Plugin\Condition;
-
-use Drupal\Core\Condition\ConditionPluginBase;
-use Drupal\taxonomy\TermInterface;
-
-/**
- * Provides an 'Is Term' condition.
- *
- * @Condition(
- *   id = "is_term",
- *   label = @Translation("Is Term"),
- *   context = {
- *     "taxonomy_term" = @ContextDefinition("entity:taxonomy_term", label = @Translation("Term"))
- *   }
- * )
- */
-class IsTerm extends ConditionPluginBase {
-
-  /**
-   * {@inheritdoc}
-   */
-  public function summary() {
-    return $this->t('The entity is a Taxonomy Term');
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getContextMapping() {
-    $this->configuration['context_mapping'] = ['taxonomy_term' => '@islandora.taxonomy_term_route_context_provider:taxonomy_term'];
-    return parent::getContextMapping();
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function evaluate() {
-    return $this->getContextValue('taxonomy_term') instanceof TermInterface;
-  }
-
-}

src/Plugin/Condition/MediaHasTerm.php

@@ -19,6 +19,10 @@ class MediaHasTerm extends NodeHasTerm {
    * {@inheritdoc}
    */
   public function evaluate() {
+    if (empty($this->configuration['uri']) && !$this->isNegated()) {
+      return TRUE;
+    }
+
     $media = $this->getContextValue('media');
     if (!$media) {
       return FALSE;

src/Plugin/Condition/MediaUsesFilesystem.php

@@ -0,0 +1,116 @@
+<?php
+
+namespace Drupal\islandora\Plugin\Condition;
+
+use Drupal\Core\File\FileSystem;
+use Drupal\islandora\MediaSource\MediaSourceService;
+use Drupal\islandora\IslandoraUtils;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a condition to filter media based on where its source file resides.
+ *
+ * @Condition(
+ *   id = "media_uses_filesystem",
+ *   label = @Translation("Media uses filesystem"),
+ *   context = {
+ *     "media" = @ContextDefinition("entity:media", required = TRUE , label = @Translation("media"))
+ *   }
+ * )
+ */
+class MediaUsesFilesystem extends FileUsesFilesystem {
+
+  /**
+   * Media source service.
+   *
+   * @var \Drupal\islandora\MediaSource\MediaSourceService
+   */
+  protected $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\File\FileSystem $file_system
+   *   File system service.
+   * @param \Drupal\islandora\MediaSource\MediaSourceService $media_source
+   *   Media source service.
+   */
+  public function __construct(
+    array $configuration,
+    $plugin_id,
+    $plugin_definition,
+    IslandoraUtils $utils,
+    FileSystem $file_system,
+    MediaSourceService $media_source
+  ) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition, $utils, $file_system);
+    $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('file_system'),
+      $container->get('islandora.media_source_service')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function summary() {
+    if (count($this->configuration['filesystems']) > 1) {
+      $filesystems = $this->configuration['filesystems'];
+      $last = array_pop($filesystems);
+      $filesystems = implode(', ', $filesystems);
+      return $this->t(
+        'The media uses @filesystems or @last',
+        [
+          '@filesystems' => $filesystems,
+          '@last' => $last,
+        ]
+      );
+    }
+    $filesystem = reset($this->configuration['filesystems']);
+    return $this->t(
+      'The media uses @filesystem',
+      [
+        '@filesystem' => $filesystem,
+      ]
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function evaluate() {
+    if (empty($this->configuration['filesystems']) && !$this->isNegated()) {
+      return TRUE;
+    }
+
+    $media = $this->getContextValue('media');
+    $file = $this->mediaSource->getSourceFile($media);
+    if (!$file) {
+      return FALSE;
+    }
+    return $this->evaluateFile($file);
+  }
+
+}

src/Plugin/Condition/NodeHasTerm.php

@@ -94,7 +94,6 @@ class NodeHasTerm extends ConditionPluginBase implements ContainerFactoryPluginI
       '#type' => 'entity_autocomplete',
       '#title' => $this->t('Term'),
       '#tags' => TRUE,
-      '#required' => TRUE,
       '#default_value' => $default,
       '#target_type' => 'taxonomy_term',
     ];
@@ -124,6 +123,10 @@ class NodeHasTerm extends ConditionPluginBase implements ContainerFactoryPluginI
    * {@inheritdoc}
    */
   public function evaluate() {
+    if (empty($this->configuration['uri']) && !$this->isNegated()) {
+      return TRUE;
+    }
+
     $node = $this->getContextValue('node');
     if (!$node) {
       return FALSE;

src/Plugin/Condition/ParentNodeHasTerm.php

@@ -19,6 +19,10 @@ class ParentNodeHasTerm extends NodeHasTerm {
    * {@inheritdoc}
    */
   public function evaluate() {
+    if (empty($this->configuration['uri']) && !$this->isNegated()) {
+      return TRUE;
+    }
+
     $media = $this->getContextValue('media');
     if (!$media) {
       return FALSE;

src/Plugin/ContextReaction/MappingUriPredicateReaction.php

@@ -4,8 +4,12 @@ namespace Drupal\islandora\Plugin\ContextReaction;
 
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
 use Drupal\islandora\ContextReaction\NormalizerAlterReaction;
+use Drupal\islandora\MediaSource\MediaSourceService;
 use Drupal\jsonld\Normalizer\NormalizerBase;
+use Drupal\media\MediaInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
  * Map URI to predicate context reaction.
@@ -15,10 +19,32 @@ use Drupal\jsonld\Normalizer\NormalizerBase;
  *   label = @Translation("Map URI to predicate")
  * )
  */
-class MappingUriPredicateReaction extends NormalizerAlterReaction {
+class MappingUriPredicateReaction extends NormalizerAlterReaction implements ContainerFactoryPluginInterface {
 
   const URI_PREDICATE = 'drupal_uri_predicate';
 
+  protected $mediaSource;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, MediaSourceService $media_source) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+    $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,
+      $container->get('islandora.media_source_service')
+    );
+  }
+
   /**
    * {@inheritdoc}
    */
@@ -43,6 +69,10 @@ class MappingUriPredicateReaction extends NormalizerAlterReaction {
       if (isset($normalized['@graph']) && is_array($normalized['@graph'])) {
         foreach ($normalized['@graph'] as &$graph) {
           if (isset($graph['@id']) && $graph['@id'] == $url) {
+            if ($entity instanceof MediaInterface) {
+              $file = $this->mediaSource->getSourceFile($entity);
+              $url = $file->url('canonical', ['absolute' => TRUE]);
+            }
             if (isset($graph[$drupal_predicate])) {
               if (!is_array($graph[$drupal_predicate])) {
                 if ($graph[$drupal_predicate] == $url) {

tests/src/Functional/AddMediaToNodeTest.php

@@ -84,7 +84,7 @@ class AddMediaToNodeTest extends IslandoraFunctionalTestBase {
       'http_errors' => FALSE,
       'headers' => [
         'Content-Type' => 'text/plain',
-        'Content-Disposition' => 'attachment; filename="test_file.txt"',
+        'Content-Location' => 'public://test_file.txt',
       ],
       'body' => $file_contents,
     ];
@@ -124,14 +124,14 @@ class AddMediaToNodeTest extends IslandoraFunctionalTestBase {
       'auth' => [$account->getUsername(), $account->pass_raw],
       'http_errors' => FALSE,
       'headers' => [
-        'Content-Disposition' => 'attachment; filename="test_file.txt"',
+        'Content-Location' => 'public://test_file.txt',
       ],
       'body' => $file_contents,
     ];
     $response = $client->request('PUT', $add_to_node_url, $options);
     $this->assertTrue($response->getStatusCode() == 400, "Expected 400, received {$response->getStatusCode()}");
 
-    // Request without Content-Disposition header should fail with 400.
+    // Request without Content-Location header should fail with 400.
     $options = [
       'auth' => [$account->getUsername(), $account->pass_raw],
       'http_errors' => FALSE,
@@ -143,26 +143,13 @@ class AddMediaToNodeTest extends IslandoraFunctionalTestBase {
     $response = $client->request('PUT', $add_to_node_url, $options);
     $this->assertTrue($response->getStatusCode() == 400, "Expected 400, received {$response->getStatusCode()}");
 
-    // Request with malformed Content-Disposition header should fail with 400.
-    $options = [
-      'auth' => [$account->getUsername(), $account->pass_raw],
-      'http_errors' => FALSE,
-      'headers' => [
-        'Content-Type' => 'text/plain',
-        'Content-Disposition' => 'garbage; filename="test_file.txt"',
-      ],
-      'body' => $file_contents,
-    ];
-    $response = $client->request('PUT', $add_to_node_url, $options);
-    $this->assertTrue($response->getStatusCode() == 400, "Expected 400, received {$response->getStatusCode()}");
-
     // Request without body should fail with 400.
     $options = [
       'auth' => [$account->getUsername(), $account->pass_raw],
       'http_errors' => FALSE,
       'headers' => [
         'Content-Type' => 'text/plain',
-        'Content-Disposition' => 'attachment; filename="test_file.txt"',
+        'Content-Location' => 'public://test_file.txt',
       ],
     ];
     $response = $client->request('PUT', $add_to_node_url, $options);
@@ -174,7 +161,7 @@ class AddMediaToNodeTest extends IslandoraFunctionalTestBase {
       'http_errors' => FALSE,
       'headers' => [
         'Content-Type' => 'text/plain',
-        'Content-Disposition' => 'attachment; filename="test_file.txt"',
+        'Content-Location' => 'public://test_file.txt',
       ],
       'body' => $file_contents,
     ];
@@ -217,7 +204,7 @@ class AddMediaToNodeTest extends IslandoraFunctionalTestBase {
       'http_errors' => FALSE,
       'headers' => [
         'Content-Type' => 'text/plain',
-        'Content-Disposition' => 'attachment; filename="test_file.txt"',
+        'Content-Location' => 'public://test_file.txt',
       ],
       'body' => $file_contents,
     ];

tests/src/Functional/ContentEntityTypeTest.php

@@ -3,11 +3,11 @@
 namespace Drupal\Tests\islandora\Functional;
 
 /**
- * Tests the IsNode condition.
+ * Tests the ContentEntityType condition.
  *
  * @group islandora
  */
-class IsNodeTest extends IslandoraFunctionalTestBase {
+class ContentEntityTypeTest extends IslandoraFunctionalTestBase {
 
   /**
    * @covers \Drupal\islandora\ContextProvider\NodeContextProvider::__construct
@@ -16,13 +16,15 @@ class IsNodeTest extends IslandoraFunctionalTestBase {
    * @covers \Drupal\islandora\ContextProvider\MediaContextProvider::getRuntimeContexts
    * @covers \Drupal\islandora\IslandoraContextManager::evaluateContexts
    * @covers \Drupal\islandora\IslandoraContextManager::applyContexts
-   * @covers \Drupal\islandora\Plugin\Condition\IsNode::evaluate
+   * @covers \Drupal\islandora\Plugin\Condition\ContentEntityType::buildConfigurationForm
+   * @covers \Drupal\islandora\Plugin\Condition\ContentEntityType::submitConfigurationForm
+   * @covers \Drupal\islandora\Plugin\Condition\ContentEntityType::evaluate
    * @covers \Drupal\islandora\PresetReaction\PresetReaction::buildConfigurationForm
    * @covers \Drupal\islandora\PresetReaction\PresetReaction::submitConfigurationForm
    * @covers \Drupal\islandora\PresetReaction\PresetReaction::execute
    * @covers \Drupal\islandora\IslandoraServiceProvider::alter
    */
-  public function testIsNode() {
+  public function testContentEntityType() {
     // Create a test user.
     $account = $this->drupalCreateUser([
       'bypass node access',
@@ -34,7 +36,10 @@ class IsNodeTest extends IslandoraFunctionalTestBase {
     $this->drupalLogin($account);
 
     $this->createContext('Test', 'test');
-    $this->addCondition('test', 'is_node');
+    $this->addCondition('test', 'content_entity_type');
+    $this->getSession()->getPage()->checkField("edit-conditions-content-entity-type-types-node");
+    $this->getSession()->getPage()->findById("edit-conditions-content-entity-type-context-mapping-node")->selectOption("@node.node_route_context:node");
+    $this->getSession()->getPage()->pressButton(t('Save and continue'));
     $this->addPresetReaction('test', 'index', 'hello_world');
 
     // Create a new node confirm Hello World! is printed to the screen.

tests/src/Functional/EmitNodeEventTest.php

@@ -18,7 +18,9 @@ class EmitNodeEventTest extends IslandoraFunctionalTestBase {
    * @covers \Drupal\islandora\EventGenerator\EventGenerator::generateEvent
    * @covers \Drupal\islandora\IslandoraContextManager::evaluateContexts
    * @covers \Drupal\islandora\IslandoraContextManager::applyContexts
-   * @covers \Drupal\islandora\Plugin\Condition\IsNode::evaluate
+   * @covers \Drupal\islandora\Plugin\Condition\ContentEntityType::buildConfigurationForm
+   * @covers \Drupal\islandora\Plugin\Condition\ContentEntityType::submitConfigurationForm
+   * @covers \Drupal\islandora\Plugin\Condition\ContentEntityType::evaluate
    * @covers \Drupal\islandora\PresetReaction\PresetReaction::buildConfigurationForm
    * @covers \Drupal\islandora\PresetReaction\PresetReaction::submitConfigurationForm
    * @covers \Drupal\islandora\PresetReaction\PresetReaction::execute
@@ -38,7 +40,12 @@ class EmitNodeEventTest extends IslandoraFunctionalTestBase {
 
     // Create a context and add the action as an index reaction.
     $this->createContext('Test', 'test');
-    $this->addCondition('test', 'is_node');
+
+    $this->addCondition('test', 'content_entity_type');
+    $this->getSession()->getPage()->checkField("edit-conditions-content-entity-type-types-node");
+    $this->getSession()->getPage()->findById("edit-conditions-content-entity-type-context-mapping-node")->selectOption("@node.node_route_context:node");
+    $this->getSession()->getPage()->pressButton(t('Save and continue'));
+
     $this->addPresetReaction('test', 'index', $action_id);
     $this->assertSession()->statusCodeEquals(200);
 

tests/src/Functional/IsFileTest.php

@@ -1,63 +0,0 @@
-<?php
-
-namespace Drupal\Tests\islandora\Functional;
-
-/**
- * Tests the IsFile condition.
- *
- * @group islandora
- */
-class IsFileTest extends IslandoraFunctionalTestBase {
-
-  /**
-   * @covers \Drupal\islandora\ContextProvider\FileContextProvider::__construct
-   * @covers \Drupal\islandora\ContextProvider\FileContextProvider::getRuntimeContexts
-   * @covers \Drupal\islandora\ContextProvider\MediaContextProvider::__construct
-   * @covers \Drupal\islandora\ContextProvider\MediaContextProvider::getRuntimeContexts
-   * @covers \Drupal\islandora\IslandoraContextManager::evaluateContexts
-   * @covers \Drupal\islandora\IslandoraContextManager::applyContexts
-   * @covers \Drupal\islandora\Plugin\Condition\IsFile::evaluate
-   * @covers \Drupal\islandora\PresetReaction\PresetReaction::buildConfigurationForm
-   * @covers \Drupal\islandora\PresetReaction\PresetReaction::submitConfigurationForm
-   * @covers \Drupal\islandora\PresetReaction\PresetReaction::execute
-   * @covers \Drupal\islandora\IslandoraServiceProvider::alter
-   */
-  public function testIsFile() {
-    // Create a test user.
-    $account = $this->drupalCreateUser([
-      'administer contexts',
-      'view media',
-      'create media',
-      'update media',
-    ]);
-    $this->drupalLogin($account);
-
-    // Set it up.
-    $this->createContext('Test', 'test');
-    $this->addCondition('test', 'is_file');
-    $this->addPresetReaction('test', 'index', 'hello_world');
-
-    // Add a new media and confirm Hello World! is printed to the
-    // screen for the file upload.
-    $file = current($this->getTestFiles('file'));
-    $values = [
-      'name[0][value]' => 'Test Media',
-      'files[field_media_file_0]' => __DIR__ . '/../../fixtures/test_file.txt',
-    ];
-    $this->drupalPostForm('media/add/' . $this->testMediaType->id(), $values, t('Save'));
-    $this->assertSession()->pageTextContains("Hello World!");
-
-    // Stash the media's url.
-    $url = $this->getUrl();
-
-    // Edit the media, not touching the file this time.
-    $values = [
-      'name[0][value]' => 'Test Media Changed',
-    ];
-    $this->postEntityEditForm($url, $values, 'Save');
-
-    // Confirm Hello World! is not printed to the screen.
-    $this->assertSession()->pageTextNotContains("Hello World!");
-  }
-
-}

tests/src/Functional/IsMediaTest.php

@@ -1,56 +0,0 @@
-<?php
-
-namespace Drupal\Tests\islandora\Functional;
-
-/**
- * Tests the IsMedia condition.
- *
- * @group islandora
- */
-class IsMediaTest extends IslandoraFunctionalTestBase {
-
-  /**
-   * @covers \Drupal\islandora\ContextProvider\NodeContextProvider::__construct
-   * @covers \Drupal\islandora\ContextProvider\NodeContextProvider::getRuntimeContexts
-   * @covers \Drupal\islandora\ContextProvider\MediaContextProvider::__construct
-   * @covers \Drupal\islandora\ContextProvider\MediaContextProvider::getRuntimeContexts
-   * @covers \Drupal\islandora\IslandoraContextManager::evaluateContexts
-   * @covers \Drupal\islandora\IslandoraContextManager::applyContexts
-   * @covers \Drupal\islandora\Plugin\Condition\IsMedia::evaluate
-   * @covers \Drupal\islandora\PresetReaction\PresetReaction::buildConfigurationForm
-   * @covers \Drupal\islandora\PresetReaction\PresetReaction::submitConfigurationForm
-   * @covers \Drupal\islandora\PresetReaction\PresetReaction::execute
-   * @covers \Drupal\islandora\IslandoraServiceProvider::alter
-   */
-  public function testIsMedia() {
-    // Create a test user.
-    $account = $this->drupalCreateUser([
-      'bypass node access',
-      'administer contexts',
-      'view media',
-      'create media',
-      'update media',
-    ]);
-    $this->drupalLogin($account);
-
-    $this->createContext('Test', 'test');
-    $this->addCondition('test', 'is_media');
-    $this->addPresetReaction('test', 'index', 'hello_world');
-
-    // Add a new media and confirm Hello World! is printed to the
-    // screen.
-    $values = [
-      'name[0][value]' => 'Test Media',
-      'files[field_media_file_0]' => __DIR__ . '/../../fixtures/test_file.txt',
-    ];
-    $this->drupalPostForm('media/add/' . $this->testMediaType->id(), $values, t('Save'));
-    $this->assertSession()->pageTextContains("Hello World!");
-
-    // Create a new node.
-    $this->postNodeAddForm('test_type', ['title[0][value]' => 'Test Node'], 'Save');
-
-    // Confirm Hello World! is not printed to the screen.
-    $this->assertSession()->pageTextNotContains("Hello World!");
-  }
-
-}

tests/src/Functional/IsTermTest.php

@@ -1,51 +0,0 @@
-<?php
-
-namespace Drupal\Tests\islandora\Functional;
-
-/**
- * Tests the IsTerm condition.
- *
- * @group islandora
- */
-class IsTermTest extends IslandoraFunctionalTestBase {
-
-  /**
-   * @covers \Drupal\islandora\ContextProvider\NodeContextProvider::__construct
-   * @covers \Drupal\islandora\ContextProvider\NodeContextProvider::getRuntimeContexts
-   * @covers \Drupal\islandora\ContextProvider\MediaContextProvider::__construct
-   * @covers \Drupal\islandora\ContextProvider\MediaContextProvider::getRuntimeContexts
-   * @covers \Drupal\islandora\IslandoraContextManager::evaluateContexts
-   * @covers \Drupal\islandora\IslandoraContextManager::applyContexts
-   * @covers \Drupal\islandora\Plugin\Condition\IsTerm::evaluate
-   * @covers \Drupal\islandora\PresetReaction\PresetReaction::buildConfigurationForm
-   * @covers \Drupal\islandora\PresetReaction\PresetReaction::submitConfigurationForm
-   * @covers \Drupal\islandora\PresetReaction\PresetReaction::execute
-   * @covers \Drupal\islandora\IslandoraServiceProvider::alter
-   */
-  public function testIsTerm() {
-    // Create a test user.
-    $account = $this->drupalCreateUser([
-      'bypass node access',
-      'administer contexts',
-      'administer taxonomy',
-    ]);
-    $this->drupalLogin($account);
-
-    $this->createContext('Test', 'test');
-    $this->addCondition('test', 'is_term');
-    $this->addPresetReaction('test', 'index', 'hello_world');
-
-    // Create a new term and confirm Hello World! is printed to the screen.
-    $this->drupalPostForm(
-      'admin/structure/taxonomy/manage/' . $this->testVocabulary->id() . '/add',
-      ['name[0][value]' => 'Test Term'],
-      t('Save')
-    );
-    $this->assertSession()->pageTextContains("Hello World!");
-
-    // Create a new node and confirm Hello World! is not printed to the screen.
-    $this->postNodeAddForm('test_type', ['title[0][value]' => 'Test Node'], 'Save');
-    $this->assertSession()->pageTextNotContains("Hello World!");
-  }
-
-}

tests/src/Kernel/FedoraAdapterTest.php

@@ -0,0 +1,549 @@
+<?php
+
+namespace Drupal\Tests\islandora\Kernel;
+
+use GuzzleHttp\Psr7;
+use GuzzleHttp\Psr7\Response;
+use Drupal\islandora\Flysystem\Adapter\FedoraAdapter;
+use Islandora\Chullo\IFedoraApi;
+use League\Flysystem\Config;
+use Prophecy\Argument;
+use Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesserInterface;
+
+/**
+ * Tests the Fedora adapter for Flysystem.
+ *
+ * @group islandora
+ * @coversDefaultClass \Drupal\islandora\Flysystem\Adapter\FedoraAdapter
+ */
+class FedoraAdapterTest extends IslandoraKernelTestBase {
+
+  /**
+   * Mocks up an adapter for Fedora calls that return 404.
+   */
+  protected function createAdapterForFail() {
+    $prophecy = $this->prophesize(Response::class);
+    $prophecy->getStatusCode()->willReturn(404);
+    $response = $prophecy->reveal();
+
+    $prophecy = $this->prophesize(IFedoraApi::class);
+    $prophecy->getResourceHeaders('')->willReturn($response);
+    $prophecy->getResource('')->willReturn($response);
+    $api = $prophecy->reveal();
+
+    $mime_guesser = $this->prophesize(MimeTypeGuesserInterface::class)->reveal();
+
+    return new FedoraAdapter($api, $mime_guesser);
+  }
+
+  /**
+   * Mocks up an adapter for Fedora LDP-NR response.
+   */
+  protected function createAdapterForFile() {
+    $prophecy = $this->prophesize(Response::class);
+    $prophecy->getStatusCode()->willReturn(200);
+    $prophecy->getHeader('Last-Modified')->willReturn(["Wed, 25 Jul 2018 17:42:04 GMT"]);
+    $prophecy->getHeader('Link')->willReturn(['<http://www.w3.org/ns/ldp#Resource>;rel="type"', '<http://www.w3.org/ns/ldp#NonRDFSource>;rel="type"']);
+    $prophecy->getHeader('Content-Type')->willReturn(['text/plain']);
+    $prophecy->getHeader('Content-Length')->willReturn([strlen("DERP")]);
+    $prophecy->getBody()->willReturn(PSR7\stream_for("DERP"));
+    $response = $prophecy->reveal();
+
+    $prophecy = $this->prophesize(IFedoraApi::class);
+    $prophecy->getResourceHeaders('')->willReturn($response);
+    $prophecy->getResource('')->willReturn($response);
+    $api = $prophecy->reveal();
+
+    $mime_guesser = $this->prophesize(MimeTypeGuesserInterface::class)->reveal();
+
+    return new FedoraAdapter($api, $mime_guesser);
+  }
+
+  /**
+   * Mocks up an adapter for Fedora LDP-RS response.
+   */
+  protected function createAdapterForDirectory() {
+    $prophecy = $this->prophesize(Response::class);
+    $prophecy->getStatusCode()->willReturn(200);
+    $prophecy->getHeader('Last-Modified')->willReturn(["Wed, 25 Jul 2018 17:42:04 GMT"]);
+    $prophecy->getHeader('Link')->willReturn(['<http://www.w3.org/ns/ldp#Resource>;rel="type"', '<http://www.w3.org/ns/ldp#RDFSource>;rel="type"']);
+    $response = $prophecy->reveal();
+
+    $prophecy = $this->prophesize(IFedoraApi::class);
+    $prophecy->getResourceHeaders('')->willReturn($response);
+    $api = $prophecy->reveal();
+
+    $mime_guesser = $this->prophesize(MimeTypeGuesserInterface::class)->reveal();
+
+    return new FedoraAdapter($api, $mime_guesser);
+  }
+
+  /**
+   * Mocks up an adapter for Fedora write requests.
+   */
+  protected function createAdapterForWrite() {
+    $fedora_prophecy = $this->prophesize(IFedoraApi::class);
+
+    $prophecy = $this->prophesize(Response::class);
+    $prophecy->getStatusCode()->willReturn(201);
+
+    $fedora_prophecy->saveResource('', '', Argument::any())->willReturn($prophecy->reveal());
+
+    $prophecy = $this->prophesize(Response::class);
+    $prophecy->getStatusCode()->willReturn(200);
+    $prophecy->getHeader('Last-Modified')->willReturn(["Wed, 25 Jul 2018 17:42:04 GMT"]);
+    $prophecy->getHeader('Link')->willReturn(['<http://www.w3.org/ns/ldp#Resource>;rel="type"', '<http://www.w3.org/ns/ldp#NonRDFSource>;rel="type"']);
+    $prophecy->getHeader('Content-Type')->willReturn(['text/plain']);
+    $prophecy->getHeader('Content-Length')->willReturn([strlen("DERP")]);
+    $prophecy->getBody()->willReturn(PSR7\stream_for("DERP"));
+
+    $fedora_prophecy->getResourceHeaders('')->willReturn($prophecy->reveal());
+
+    $api = $fedora_prophecy->reveal();
+
+    $mime_guesser = $this->prophesize(MimeTypeGuesserInterface::class)->reveal();
+
+    return new FedoraAdapter($api, $mime_guesser);
+  }
+
+  /**
+   * Mocks up an adapter for Fedora write requests that fail.
+   */
+  protected function createAdapterForWriteFail() {
+    $fedora_prophecy = $this->prophesize(IFedoraApi::class);
+
+    $prophecy = $this->prophesize(Response::class);
+    $prophecy->getStatusCode()->willReturn(500);
+
+    $fedora_prophecy->saveResource('', '', Argument::any())->willReturn($prophecy->reveal());
+
+    $api = $fedora_prophecy->reveal();
+
+    $mime_guesser = $this->prophesize(MimeTypeGuesserInterface::class)->reveal();
+
+    return new FedoraAdapter($api, $mime_guesser);
+  }
+
+  /**
+   * Mocks up an adapter for creating directories requests.
+   */
+  protected function createAdapterForCreateDir() {
+    $fedora_prophecy = $this->prophesize(IFedoraApi::class);
+
+    $prophecy = $this->prophesize(Response::class);
+    $prophecy->getStatusCode()->willReturn(201);
+
+    $fedora_prophecy->saveResource('')->willReturn($prophecy->reveal());
+
+    $prophecy = $this->prophesize(Response::class);
+    $prophecy->getStatusCode()->willReturn(200);
+    $prophecy->getHeader('Last-Modified')->willReturn(["Wed, 25 Jul 2018 17:42:04 GMT"]);
+    $prophecy->getHeader('Link')->willReturn(['<http://www.w3.org/ns/ldp#Resource>;rel="type"', '<http://www.w3.org/ns/ldp#RDFSource>;rel="type"']);
+
+    $fedora_prophecy->getResourceHeaders('')->willReturn($prophecy->reveal());
+
+    $api = $fedora_prophecy->reveal();
+
+    $mime_guesser = $this->prophesize(MimeTypeGuesserInterface::class)->reveal();
+
+    return new FedoraAdapter($api, $mime_guesser);
+  }
+
+  /**
+   * Mocks up an adapter for Delete requests.
+   */
+  protected function createAdapterForDelete() {
+    $fedora_prophecy = $this->prophesize(IFedoraApi::class);
+
+    $prophecy = $this->prophesize(Response::class);
+    $prophecy->getStatusCode()->willReturn(204);
+
+    $fedora_prophecy->deleteResource('')->willReturn($prophecy->reveal());
+    $fedora_prophecy->getResourceHeaders('')->willReturn($prophecy->reveal());
+    $api = $fedora_prophecy->reveal();
+
+    $mime_guesser = $this->prophesize(MimeTypeGuesserInterface::class)->reveal();
+
+    return new FedoraAdapter($api, $mime_guesser);
+  }
+
+  /**
+   * Mocks up an adapter for Delete requests that fail.
+   */
+  protected function createAdapterForDeleteFail() {
+    $fedora_prophecy = $this->prophesize(IFedoraApi::class);
+
+    $prophecy = $this->prophesize(Response::class);
+    $prophecy->getStatusCode()->willReturn(500);
+
+    $fedora_prophecy->deleteResource('')->willReturn($prophecy->reveal());
+
+    $api = $fedora_prophecy->reveal();
+
+    $mime_guesser = $this->prophesize(MimeTypeGuesserInterface::class)->reveal();
+
+    return new FedoraAdapter($api, $mime_guesser);
+  }
+
+  /**
+   * Asserts the stucture/contents of a metadata response for a file.
+   */
+  protected function assertFileMetadata(array $metadata) {
+    $this->assertTrue($metadata['type'] == 'file', "Expecting 'type' of 'file', received '" . $metadata['type'] . "'");
+    $this->assertTrue($metadata['timestamp'] == '1532540524', "Expecting 'timestamp' of '1532540524', received '" . $metadata['timestamp'] . "'");
+    $this->assertTrue($metadata['size'] == strlen("DERP"), "Expecting 'size' of '" . strlen("DERP") . "', received '" . $metadata['size'] . "'");
+    $this->assertTrue($metadata['mimetype'] == 'text/plain', "Expecting 'mimetype' of 'image/png', received '" . $metadata['mimetype'] . "'");
+  }
+
+  /**
+   * Asserts the stucture/contents of a metadata response for a directory.
+   */
+  protected function assertDirMetadata(array $metadata) {
+    $this->assertTrue($metadata['type'] == 'dir', "Expecting 'type' of 'dir', received '" . $metadata['type'] . "'");
+    $this->assertTrue($metadata['timestamp'] == '1532540524', "Expecting 'timestamp' of '1532540524', received '" . $metadata['timestamp'] . "'");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::getMetadata
+   */
+  public function testGetMetadataFail() {
+    $adapter = $this->createAdapterForFail();
+
+    $this->assertTrue($adapter->getMetadata('') == FALSE, "getMetadata() must return FALSE on non-200");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::getMetadata
+   */
+  public function testGetMetadataForFile() {
+    $adapter = $this->createAdapterForFile();
+
+    $metadata = $adapter->getMetadata('');
+    $this->assertFileMetadata($metadata);
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::getMetadata
+   */
+  public function testGetMetadataForDirectory() {
+    $adapter = $this->createAdapterForDirectory();
+
+    $metadata = $adapter->getMetadata('');
+    $this->assertDirMetadata($metadata);
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::readStream
+   */
+  public function testReadStream() {
+    $adapter = $this->createAdapterForFile();
+
+    $metadata = $adapter->readStream('');
+    $this->assertFileMetadata($metadata);
+    $this->assertTrue(is_resource($metadata['stream']), "Expecting a 'stream' that is a resource");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::readStream
+   */
+  public function testReadStreamFail() {
+    $adapter = $this->createAdapterForFail();
+
+    $this->assertTrue($adapter->readStream('') == FALSE, "readStream() should return FALSE on non-200 from Fedora");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::read
+   */
+  public function testRead() {
+    $adapter = $this->createAdapterForFile();
+
+    $metadata = $adapter->read('');
+    $this->assertFileMetadata($metadata);
+    $this->assertTrue($metadata['contents'] == "DERP", "Expecting 'content' of 'DERP', received '${metadata['contents']}'");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::read
+   */
+  public function testReadFail() {
+    $adapter = $this->createAdapterForFail();
+
+    $this->assertTrue($adapter->read('') == FALSE, "readStream() should return FALSE on non-200 from Fedora");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::has
+   */
+  public function testHasFail() {
+    $adapter = $this->createAdapterForFail();
+
+    $this->assertTrue($adapter->has('') == FALSE, "has() must return FALSE on non-200");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::has
+   */
+  public function testHasSuccess() {
+    $adapter = $this->createAdapterForFile();
+
+    $this->assertTrue($adapter->has('') == TRUE, "has() must return TRUE on 200");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::getSize
+   */
+  public function testGetSizeFail() {
+    $adapter = $this->createAdapterForFail();
+
+    $this->assertTrue($adapter->getSize('') == FALSE, "getSize() must return FALSE on non-200");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::getSize
+   */
+  public function testGetSizeSuccess() {
+    $adapter = $this->createAdapterForFile();
+
+    $metadata = $adapter->getSize('');
+    $this->assertTrue($metadata['size'] == strlen("DERP"), "Expecting 'size' of '" . strlen("DERP") . "', received '" . $metadata['size'] . "'");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::getMimetype
+   */
+  public function testGetMimetypeFail() {
+    $adapter = $this->createAdapterForFail();
+
+    $this->assertTrue($adapter->getMimetype('') == FALSE, "getMimetype() must return FALSE on non-200");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::getMimetype
+   */
+  public function testGetMimetypeSuccess() {
+    $adapter = $this->createAdapterForFile();
+
+    $metadata = $adapter->getMimetype('');
+    $this->assertTrue($metadata['mimetype'] == 'text/plain', "Expecting 'mimetype' of 'text/plain', received '" . $metadata['mimetype'] . "'");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::getTimestamp
+   */
+  public function testGetTimestampFail() {
+    $adapter = $this->createAdapterForFail();
+
+    $this->assertTrue($adapter->getTimestamp('') == FALSE, "getTimestamp() must return FALSE on non-200");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::getTimestamp
+   */
+  public function testGetTimestampSuccess() {
+    $adapter = $this->createAdapterForFile();
+
+    $metadata = $adapter->getTimestamp('');
+    $this->assertTrue($metadata['timestamp'] == '1532540524', "Expecting 'timestamp' of '1532540524', received '" . $metadata['timestamp'] . "'");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::write
+   */
+  public function testWriteFail() {
+    $adapter = $this->createAdapterForWriteFail();
+
+    $this->assertTrue($adapter->write('', '', $this->prophesize(Config::class)->reveal()) == FALSE, "write() must return FALSE on non-201 or non-204");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::write
+   */
+  public function testWrite() {
+    $adapter = $this->createAdapterForWrite();
+
+    $metadata = $adapter->write('', '', $this->prophesize(Config::class)->reveal());
+    $this->assertFileMetadata($metadata);
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::writeStream
+   */
+  public function testWriteStreamFail() {
+    $adapter = $this->createAdapterForWriteFail();
+
+    $this->assertTrue($adapter->writeStream('', '', $this->prophesize(Config::class)->reveal()) == FALSE, "writeStream() must return FALSE on non-201 or non-204");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::writeStream
+   */
+  public function testWriteStream() {
+    $adapter = $this->createAdapterForWrite();
+
+    $metadata = $adapter->writeStream('', '', $this->prophesize(Config::class)->reveal());
+    $this->assertFileMetadata($metadata);
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::update
+   */
+  public function testUpdateFail() {
+    $adapter = $this->createAdapterForWriteFail();
+
+    $this->assertTrue($adapter->update('', '', $this->prophesize(Config::class)->reveal()) == FALSE, "write() must return FALSE on non-201 or non-204");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::update
+   */
+  public function testUpdate() {
+    $adapter = $this->createAdapterForWrite();
+
+    $metadata = $adapter->update('', '', $this->prophesize(Config::class)->reveal());
+    $this->assertFileMetadata($metadata);
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::updateStream
+   */
+  public function testUpdateStreamFail() {
+    $adapter = $this->createAdapterForWriteFail();
+
+    $this->assertTrue($adapter->updateStream('', '', $this->prophesize(Config::class)->reveal()) == FALSE, "writeStream() must return FALSE on non-201 or non-204");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::updateStream
+   */
+  public function testUpdateStream() {
+    $adapter = $this->createAdapterForWrite();
+
+    $metadata = $adapter->updateStream('', '', $this->prophesize(Config::class)->reveal());
+    $this->assertFileMetadata($metadata);
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::delete
+   */
+  public function testDeleteFail() {
+    $adapter = $this->createAdapterForDeleteFail();
+
+    $this->assertTrue($adapter->delete('') == FALSE, "delete() must return FALSE on non-204 or non-404");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::delete
+   */
+  public function testDelete() {
+    $adapter = $this->createAdapterForDelete();
+
+    $this->assertTrue($adapter->delete('') == TRUE, "delete() must return TRUE on 204 or 404");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::deleteDir
+   */
+  public function testDeleteDirFail() {
+    $adapter = $this->createAdapterForDeleteFail();
+
+    $this->assertTrue($adapter->deleteDir('') == FALSE, "deleteDir() must return FALSE on non-204 or non-404");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::deleteDir
+   */
+  public function testDeleteDir() {
+    $adapter = $this->createAdapterForDelete();
+
+    $this->assertTrue($adapter->deleteDir('') == TRUE, "deleteDir() must return TRUE on 204 or 404");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::rename
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::copy
+   */
+  public function testRenameFail() {
+    $adapter = $this->createAdapterForFail();
+
+    $this->assertTrue($adapter->rename('', '') == FALSE, "rename() must return FALSE on Fedora error");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::rename
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::copy
+   */
+  public function testRename() {
+    $prophecy = $this->prophesize(Response::class);
+    $prophecy->getStatusCode()->willReturn(200);
+    $prophecy->getHeader('Last-Modified')->willReturn(["Wed, 25 Jul 2018 17:42:04 GMT"]);
+    $prophecy->getHeader('Link')->willReturn(['<http://www.w3.org/ns/ldp#Resource>;rel="type"', '<http://www.w3.org/ns/ldp#NonRDFSource>;rel="type"']);
+    $prophecy->getHeader('Content-Type')->willReturn(['text/plain']);
+    $prophecy->getHeader('Content-Length')->willReturn([strlen("DERP")]);
+    $prophecy->getBody()->willReturn(PSR7\stream_for("DERP"));
+    $response = $prophecy->reveal();
+
+    $fedora_prophecy = $this->prophesize(IFedoraApi::class);
+    $fedora_prophecy->getResource(Argument::any())->willReturn($response);
+
+    $prophecy = $this->prophesize(Response::class);
+    $prophecy->getStatusCode()->willReturn(201);
+    $response = $prophecy->reveal();
+
+    $fedora_prophecy->saveResource(Argument::any(), Argument::any(), Argument::any())->willReturn($response);
+
+    $prophecy = $this->prophesize(Response::class);
+    $prophecy->getStatusCode()->willReturn(200);
+    $prophecy->getHeader('Last-Modified')->willReturn(["Wed, 25 Jul 2018 17:42:04 GMT"]);
+    $prophecy->getHeader('Link')->willReturn(['<http://www.w3.org/ns/ldp#Resource>;rel="type"', '<http://www.w3.org/ns/ldp#NonRDFSource>;rel="type"']);
+    $prophecy->getHeader('Content-Type')->willReturn(['text/plain']);
+    $prophecy->getHeader('Content-Length')->willReturn([strlen("DERP")]);
+    $response = $prophecy->reveal();
+
+    $fedora_prophecy->getResourceHeaders(Argument::any())->willReturn($response);
+
+    $prophecy = $this->prophesize(Response::class);
+    $prophecy->getStatusCode()->willReturn(204);
+    $response = $prophecy->reveal();
+
+    $fedora_prophecy->deleteResource(Argument::any())->willReturn($response);
+
+    $api = $fedora_prophecy->reveal();
+
+    $mime_guesser = $this->prophesize(MimeTypeGuesserInterface::class)->reveal();
+
+    $adapter = new FedoraAdapter($api, $mime_guesser);
+
+    $this->assertTrue($adapter->rename('', '') == TRUE, "rename() must return TRUE on success");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::createDir
+   */
+  public function testCreateDirFail() {
+    $prophecy = $this->prophesize(Response::class);
+    $prophecy->getStatusCode()->willReturn(500);
+
+    $fedora_prophecy = $this->prophesize(IFedoraApi::class);
+    $fedora_prophecy->saveResource('')->willReturn($prophecy->reveal());
+
+    $api = $fedora_prophecy->reveal();
+
+    $mime_guesser = $this->prophesize(MimeTypeGuesserInterface::class)->reveal();
+
+    $adapter = new FedoraAdapter($api, $mime_guesser);
+
+    $this->assertTrue($adapter->createDir('', $this->prophesize(Config::class)->reveal()) == FALSE, "createDir() must return FALSE on fail");
+  }
+
+  /**
+   * @covers \Drupal\islandora\Flysystem\Adapter\FedoraAdapter::createDir
+   */
+  public function testCreateDir() {
+    $adapter = $this->createAdapterForCreateDir();
+
+    $metadata = $adapter->createDir('', $this->prophesize(Config::class)->reveal());
+    $this->assertDirMetadata($metadata);
+  }
+
+}

tests/src/Kernel/FedoraPluginTest.php

@@ -0,0 +1,62 @@
+<?php
+
+namespace Drupal\Tests\islandora\Kernel;
+
+use Drupal\islandora\Flysystem\Fedora;
+use League\Flysystem\AdapterInterface;
+use Islandora\Chullo\IFedoraApi;
+use Psr\Http\Message\ResponseInterface;
+use Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesserInterface;
+
+/**
+ * Tests the Fedora plugin for Flysystem.
+ *
+ * @group islandora
+ * @coversDefaultClass \Drupal\islandora\Flysystem\Fedora
+ */
+class FedoraPluginTest extends IslandoraKernelTestBase {
+
+  /**
+   * Mocks up a plugin.
+   */
+  protected function createPlugin($return_code) {
+    $prophecy = $this->prophesize(ResponseInterface::class);
+    $prophecy->getStatusCode()->willReturn($return_code);
+    $response = $prophecy->reveal();
+
+    $prophecy = $this->prophesize(IFedoraApi::class);
+    $prophecy->getResourceHeaders('')->willReturn($response);
+    $prophecy->getBaseUri()->willReturn("");
+    $api = $prophecy->reveal();
+
+    $mime_guesser = $this->prophesize(MimeTypeGuesserInterface::class)->reveal();
+
+    return new Fedora($api, $mime_guesser);
+  }
+
+  /**
+   * Tests the getAdapter() method.
+   *
+   * @covers \Drupal\islandora\Flysystem\Fedora::getAdapter
+   */
+  public function testGetAdapter() {
+    $plugin = $this->createPlugin(200);
+    $adapter = $plugin->getAdapter();
+
+    $this->assertTrue($adapter instanceof AdapterInterface, "getAdapter() must return an AdapterInterface");
+  }
+
+  /**
+   * Tests the ensure() method.
+   *
+   * @covers \Drupal\islandora\Flysystem\Fedora::ensure
+   */
+  public function testEnsure() {
+    $plugin = $this->createPlugin(200);
+    $this->assertTrue(empty($plugin->ensure()), "ensure() must return an empty array on success");
+
+    $plugin = $this->createPlugin(404);
+    $this->assertTrue(!empty($plugin->ensure()), "ensure() must return a non-empty array on fail");
+  }
+
+}

tests/src/Kernel/IslandoraKernelTestBase.php

@@ -37,6 +37,7 @@ abstract class IslandoraKernelTestBase extends KernelTestBase {
     'image',
     'media',
     'islandora',
+    'flysystem',
   ];
 
   /**