Start adding support for outgoing mentions

includes/class-activity-dispatcher.php

@@ -23,17 +23,36 @@ class Activity_Dispatcher {
 	 *
 	 * @param \Activitypub\Model\Post $activitypub_post
 	 */
-	public static function send_post_activity( $activitypub_post ) {
+	public static function send_post_activity( Model\Post $activitypub_post ) {
 		// get latest version of post
 		$user_id = $activitypub_post->get_post_author();
 
 		$activitypub_activity = new \Activitypub\Model\Activity( 'Create', \Activitypub\Model\Activity::TYPE_FULL );
-		$activitypub_activity->from_post( $activitypub_post->to_array() );
+		$activitypub_activity->from_post( $activitypub_post );
 
+		$sent = array();
 		foreach ( \Activitypub\get_follower_inboxes( $user_id ) as $inbox => $to ) {
+			$sent[ $to ] = true;
 			$activitypub_activity->set_to( $to );
 			$activity = $activitypub_activity->to_json(); // phpcs:ignore
 
+			\Activitypub\safe_remote_post( $inbox, $activity, $user_id );
+		}
+		$followers_url = \get_rest_url( null, '/activitypub/1.0/users/' . intval( $user_id ) . '/followers' );
+		foreach ( $activitypub_activity->get_cc() as $cc ) {
+			if ( $cc === $followers_url ) {
+				continue;
+			}
+			$inbox = \Activitypub\get_inbox_by_actor( $cc );
+			if ( ! $inbox || \is_wp_error( $inbox ) ) {
+				continue;
+			}
+			if ( isset( $sent[ $cc ] ) ) {
+				continue;
+			}
+			$sent[ $cc ] = true;
+			$activity = $activitypub_activity->to_json(); // phpcs:ignore
+
 			\Activitypub\safe_remote_post( $inbox, $activity, $user_id );
 		}
 	}

includes/model/class-activity.php

@@ -45,16 +45,24 @@ class Activity {
 		}
 	}
 
-	public function from_post( $object ) {
+	public function from_post( Post $post ) {
+		$object = apply_filters( 'activitypub_from_post_array', $post->to_array() );
 		$this->object = $object;
+
 		if ( isset( $object['published'] ) ) {
 			$this->published = $object['published'];
 		}
+		$this->cc = array( \get_rest_url( null, '/activitypub/1.0/users/' . intval( $post->get_post_author() ) . '/followers' ) );
 
 		if ( isset( $object['attributedTo'] ) ) {
 			$this->actor = $object['attributedTo'];
 		}
 
+		$mentions = apply_filters( 'activitypub_extract_mentions', array(), $post );
+		foreach ( $mentions as $mention ) {
+			$this->cc[] = $mention;
+		}
+
 		$type = \strtolower( $this->type );
 
 		if ( isset( $object['id'] ) ) {

tests/test-class-activitypub-activity-dispatcher.php

@@ -0,0 +1,97 @@
+<?php
+class Test_Activitypub_Activity_Dispatcher extends WP_UnitTestCase {
+	public static $users = array();
+	public function test_dispatch_mentions() {
+		$post = \wp_insert_post(
+			array(
+				'post_author' => 1,
+				'post_content' => '@alex hello',
+			)
+		);
+
+		self::$users['https://example.com/alex'] = array(
+			'url' => 'https://example.com/alex',
+			'inbox' => 'https://example.com/alex/inbox',
+			'name'  => 'alex',
+		);
+
+		add_filter(
+			'activitypub_extract_mentions',
+			function( $mentions ) {
+				$mentions[] = 'https://example.com/alex';
+				return $mentions;
+			},
+			10
+		);
+
+		$pre_http_request = new MockAction();
+		add_filter( 'pre_http_request', array( $pre_http_request, 'filter' ), 10, 3 );
+
+		$activitypub_post = new \Activitypub\Model\Post( $post );
+		\Activitypub\Activity_Dispatcher::send_post_activity( $activitypub_post );
+
+		$this->assertSame( 1, $pre_http_request->get_call_count() );
+		$all_args = $pre_http_request->get_args();
+		$first_call_args = $all_args[0];
+		$this->assertEquals( 'https://example.com/alex/inbox', $first_call_args[2] );
+
+		remove_all_filters( 'activitypub_from_post_object' );
+		remove_filter( 'pre_http_request', array( $pre_http_request, 'filter' ), 10 );
+	}
+
+	public function set_up() {
+		parent::set_up();
+
+		add_filter( 'pre_http_request', array( get_called_class(), 'pre_http_request' ), 10, 3 );
+		add_filter( 'http_response', array( get_called_class(), 'http_response' ), 10, 3 );
+		add_filter( 'http_request_host_is_external', array( get_called_class(), 'http_request_host_is_external' ), 10, 2 );
+		add_filter( 'http_request_args', array( get_called_class(), 'http_request_args' ), 10, 2 );
+		add_filter( 'pre_get_remote_metadata_by_actor', array( get_called_class(), 'pre_get_remote_metadata_by_actor' ), 10, 2 );
+
+		_delete_all_posts();
+	}
+
+	public function tear_down() {
+		remove_filter( 'pre_http_request', array( get_called_class(), 'pre_http_request' ) );
+		remove_filter( 'http_response', array( get_called_class(), 'http_response' ) );
+		remove_filter( 'http_request_host_is_external', array( get_called_class(), 'http_request_host_is_external' ) );
+		remove_filter( 'http_request_args', array( get_called_class(), 'http_request_args' ) );
+		remove_filter( 'pre_get_remote_metadata_by_actor', array( get_called_class(), 'pre_get_remote_metadata_by_actor' ) );
+		parent::tear_down();
+	}
+
+	public static function pre_get_remote_metadata_by_actor( $pre, $actor ) {
+		if ( isset( self::$users[ $actor ] ) ) {
+			return self::$users[ $actor ];
+		}
+		return $pre;
+	}
+
+	public static function http_request_host_is_external( $in, $host ) {
+		if ( in_array( $host, array( 'example.com', 'example.org' ), true ) ) {
+			return true;
+		}
+		return $in;
+	}
+	public static function http_request_args( $args, $url ) {
+		if ( in_array( parse_url( $url, PHP_URL_HOST ), array( 'example.com', 'example.org' ), true ) ) {
+			$args['reject_unsafe_urls'] = false;
+		}
+		return $args;
+	}
+	public static function pre_http_request( $preempt, $request, $url ) {
+		return array(
+			'headers'  => array(
+				'content-type' => 'text/json',
+			),
+			'body'     => '',
+			'response' => array(
+				'code' => 202,
+			),
+		);
+	}
+
+	public static function http_response( $response, $args, $url ) {
+		return $response;
+	}
+}

tests/test-class-activitypub-activity.php

@@ -0,0 +1,32 @@
+<?php
+class Test_Activitypub_Activity extends WP_UnitTestCase {
+	public function test_activity_mentions() {
+		$post = \wp_insert_post(
+			array(
+				'post_author' => 1,
+				'post_content' => '@alex hello',
+			)
+		);
+
+		add_filter(
+			'activitypub_extract_mentions',
+			function( $mentions, $post ) {
+				$mentions[] = 'https://example.com/alex';
+				return $mentions;
+			},
+			10,
+			2
+		);
+
+		$activitypub_post = new \Activitypub\Model\Post( $post );
+
+		$activitypub_activity = new \Activitypub\Model\Activity( 'Create', \Activitypub\Model\Activity::TYPE_FULL );
+		$activitypub_activity->from_post( $activitypub_post );
+
+		$this->assertContains( \get_rest_url( null, '/activitypub/1.0/users/1/followers' ), $activitypub_activity->get_cc() );
+		$this->assertContains( 'https://example.com/alex', $activitypub_activity->get_cc() );
+
+		remove_all_filters( 'activitypub_from_post_object' );
+		\wp_trash_post( $post );
+	}
+}