Implement Like activity

inc/activities/delete.php

@@ -6,7 +6,9 @@ require_once plugin_dir_path( __FILE__ ) . '/../objects.php';
 function handle( $actor, $activity ) {
     if ( !array_key_exists( 'object', $activity ) ) {
         return new \WP_Error(
-            'invalid_activity', __( 'Expected an object', 'activitypub' )
+            'invalid_activity',
+            __( 'Expected an object', 'activitypub' ),
+            array( 'status' => 40 )
         );
     }
     $object = $activity['object'];

inc/activities/like.php

@@ -1,4 +1,31 @@
 <?php
 namespace activites\like;
 
+require_once plugin_dir_path( __FILE__ ) . '/../likes.php';
+require_once plugin_dir_path( __FILE__ ) . '/../actors.php';
+
+function handle( $actor, $activity ) {
+    if ( !array_key_exists( 'object', $activity ) ) {
+        return new \WP_Error(
+            'invalid_activity',
+            __( 'Expected an object', 'activitypub' ),
+            array( 'status' => 400 )
+        );
+    }
+    $object = $activity['object'];
+    if ( !array_key_exists( 'id', $object ) ) {
+        return new \WP_Error(
+            'invalid_object',
+            __( 'Expected an object id', 'activitypub' ),
+            array( 'status' => 400 )
+        );
+    }
+    $object_id = $object['id'];
+    $actor_id = \actors\get_actor_id( $actor );
+    $res = \likes\create_like( $actor_id, $object_id );
+    if ( is_wp_error( $res ) ) {
+        return $res;
+    }
+    return $activity;
+}
 ?>

inc/actors.php

@@ -17,6 +17,13 @@ function get_actor_by_slug ( $slug ) {
     return get_user_from_row( $row );
 }
 
+function get_actor_id( $slug ) {
+    global $wpdb;
+    return $wpdb->get_var( $wpdb->prepare(
+        "SELECT slug FROM activitypub_actors WHERE slug = %s", $slug
+    ) );
+}
+
 function get_user_from_row( $row ) {
     switch ( $row->type ) {
     case "user":

inc/init.php

@@ -6,6 +6,7 @@ require_once plugin_dir_path( __FILE__ ) . '/api.php';
 require_once plugin_dir_path( __FILE__ ) . '/objects.php';
 require_once plugin_dir_path( __FILE__ ) . '/activities.php';
 require_once plugin_dir_path( __FILE__ ) . '/actors.php';
+require_once plugin_dir_path( __FILE__ ) . '/likes.php';
 
 add_action( 'rest_api_init', function() {
     \api\register_routes();
@@ -22,5 +23,6 @@ add_action( 'activitypub_init', function() {
     \outbox\create_outbox_table();
     \actors\create_actors_table();
     \actors\initialize_user_actors();
+    \likes\create_likes_table();
 } );
 ?>

inc/likes.php

@@ -1,6 +1,13 @@
 <?php
 namespace likes;
 
+function create_like( $actor_id, $object_id ) {
+    global $wpdb;
+    return $wpdb->insert(
+        'activitypub_likes', array( 'actor_id' => $actor_id, 'object_url' => $object_id )
+    );
+}
+
 function create_likes_table() {
     global $wpdb;
     $wpdb->query(
@@ -8,7 +15,8 @@ function create_likes_table() {
         CREATE TABLE IF NOT EXISTS activitypub_likes (
             actor_id INT NOT NULL,
             object_url TEXT NOT NULL,
-
+            FOREIGN KEY actor_fk(actor_id)
+            REFERENCES activitypub_actors(id)
         );
         "
     );