Add BC layer for notification blueprints

This gives extension authors time to add the new `getAttributes()`
method to their `BlueprintInterface` implementations.

The layer itself is easy to remove in beta.14.

src/Notification/Blueprint/AbstractBlueprint.php

@@ -1,23 +0,0 @@
-<?php
-
-/*
- * This file is part of Flarum.
- *
- * For detailed copyright and license information, please view the
- * LICENSE file that was distributed with this source code.
- */
-
-namespace Flarum\Notification\Blueprint;
-
-abstract class AbstractBlueprint implements BlueprintInterface
-{
-    public function getAttributes(): array
-    {
-        return [
-            'type' => static::getType(),
-            'from_user_id' => ($fromUser = $this->getFromUser()) ? $fromUser->id : null,
-            'subject_id' => ($subject = $this->getSubject()) ? $subject->getKey() : null,
-            'data' => ($data = $this->getData()) ? json_encode($data) : null
-        ];
-    }
-}

src/Notification/Blueprint/BlueprintInterface.php

@@ -22,6 +22,7 @@ interface BlueprintInterface
     /**
      * Get the user that sent the notification.
      *
+     * @deprecated Will be removed for beta.14
      * @return User|null
      */
     public function getFromUser();
@@ -29,6 +30,7 @@ interface BlueprintInterface
     /**
      * Get the model that is the subject of this activity.
      *
+     * @deprecated Will be removed for beta.14
      * @return AbstractModel|null
      */
     public function getSubject();
@@ -36,10 +38,19 @@ interface BlueprintInterface
     /**
      * Get the data to be stored in the notification.
      *
+     * @deprecated Will be removed for beta.14
      * @return array|null
      */
     public function getData();
 
+    /**
+     * Get the attributes that uniquely identify a notification, plus metadata.
+     * TODO: Uncomment this for beta.14.
+     *
+     * @return array
+     */
+    //public function getAttributes(): array;
+
     /**
      * Get the serialized type of this activity.
      *

src/Notification/BlueprintBC.php

@@ -0,0 +1,36 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Flarum\Notification;
+
+use Flarum\Notification\Blueprint\BlueprintInterface;
+
+/**
+ * A backwards compatibility layer for notification blueprints.
+ *
+ * Will be removed for Beta 14 in favor of BlueprintInterface::getAttributes().
+ *
+ * @deprecated
+ */
+class BlueprintBC
+{
+    public static function getAttributes(BlueprintInterface $blueprint): array
+    {
+        if (method_exists($blueprint, 'getAttributes')) {
+            return $blueprint->getAttributes();
+        } else {
+            return [
+                'type' => $blueprint::getType(),
+                'from_user_id' => ($fromUser = $blueprint->getFromUser()) ? $fromUser->id : null,
+                'subject_id' => ($subject = $blueprint->getSubject()) ? $subject->id : null,
+                'data' => ($data = $blueprint->getData()) ? json_encode($data) : null
+            ];
+        }
+    }
+}

src/Notification/Job/SendNotificationsJob.php

@@ -11,6 +11,7 @@ namespace Flarum\Notification\Job;
 
 use Carbon\Carbon;
 use Flarum\Notification\Blueprint\BlueprintInterface;
+use Flarum\Notification\BlueprintBC;
 use Flarum\Notification\Event\Sending;
 use Flarum\Notification\Notification;
 use Flarum\Queue\AbstractJob;
@@ -40,7 +41,7 @@ class SendNotificationsJob extends AbstractJob
 
         event(new Sending($this->blueprint, $this->recipients));
 
-        $attributes = $this->blueprint->getAttributes();
+        $attributes = BlueprintBC::getAttributes($this->blueprint);
 
         Notification::insert(
             array_map(function (User $user) use ($attributes, $now) {

src/Notification/NotificationSyncer.php

@@ -58,7 +58,7 @@ class NotificationSyncer
      */
     public function sync(Blueprint\BlueprintInterface $blueprint, array $users)
     {
-        $attributes = $blueprint->getAttributes();
+        $attributes = BlueprintBC::getAttributes($blueprint);
 
         // Find all existing notification records in the database matching this
         // blueprint. We will begin by assuming that they all need to be
@@ -121,7 +121,7 @@ class NotificationSyncer
      */
     public function delete(BlueprintInterface $blueprint)
     {
-        Notification::where($blueprint->getAttributes())->update(['is_deleted' => true]);
+        Notification::where(BlueprintBC::getAttributes($blueprint))->update(['is_deleted' => true]);
     }
 
     /**
@@ -132,7 +132,7 @@ class NotificationSyncer
      */
     public function restore(BlueprintInterface $blueprint)
     {
-        Notification::where($blueprint->getAttributes())->update(['is_deleted' => false]);
+        Notification::where(BlueprintBC::getAttributes($blueprint))->update(['is_deleted' => false]);
     }
 
     /**