final fixes and more tests

includes/functions.php

@@ -312,14 +312,16 @@ function is_user_disabled( $user_id ) {
  * @return boolean True if the blog is in single-user mode, false otherwise.
  */
 function is_single_user() {
+	$return = false;
+
 	if (
 		false === ACTIVITYPUB_DISABLE_BLOG_USER &&
 		true === ACTIVITYPUB_DISABLE_USER
 	) {
-		return true;
+		$return = true;
 	}
 
-	return false;
+	return apply_filters( 'activitypub_is_single_user', $return );
 }
 
 if ( ! function_exists( 'get_self_link' ) ) {

includes/transformer/class-post.php

@@ -3,7 +3,7 @@ namespace Activitypub\Transformer;
 
 use WP_Post;
 use Activitypub\Collection\Users;
-use Activitypub\Collection\Blog_Users;
+use Activitypub\Model\Blog_User;
 use Activitypub\Activity\Base_Object;
 
 use function Activitypub\is_single_user;

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

@@ -47,6 +47,8 @@ class Test_Activitypub_Activity_Dispatcher extends ActivityPub_TestCase_Cache_HT
 
 		$json = json_decode( $second_call_args[1]['body'] );
 		$this->assertEquals( 'Create', $json->type );
+		$this->assertEquals( 'http://example.org/?author=1', $json->actor );
+		$this->assertEquals( 'http://example.org/?author=1', $json->object->attributedTo );
 
 		remove_filter( 'pre_http_request', array( $pre_http_request, 'filter' ), 10 );
 	}
@@ -125,6 +127,47 @@ class Test_Activitypub_Activity_Dispatcher extends ActivityPub_TestCase_Cache_HT
 		remove_filter( 'pre_http_request', array( $pre_http_request, 'filter' ), 10 );
 	}
 
+	public function test_dispatch_blog_activity() {
+		$followers = array( 'https://example.com/author/jon' );
+
+		add_filter(
+			'activitypub_is_single_user',
+			function( $return ) {
+				return true;
+			}
+		);
+
+		foreach ( $followers as $follower ) {
+			\Activitypub\Collection\Followers::add_follower( \Activitypub\Collection\Users::BLOG_USER_ID, $follower );
+		}
+
+		$post = \wp_insert_post(
+			array(
+				'post_author' => 1,
+				'post_content' => 'hello',
+			)
+		);
+
+		$pre_http_request = new MockAction();
+		add_filter( 'pre_http_request', array( $pre_http_request, 'filter' ), 10, 3 );
+
+		\Activitypub\Activity_Dispatcher::send_activity_or_announce( get_post( $post ), 'Create' );
+
+		$all_args = $pre_http_request->get_args();
+		$first_call_args = $all_args[0];
+
+		$this->assertSame( 1, $pre_http_request->get_call_count() );
+
+		$user = new \Activitypub\Model\Blog_User();
+
+		$json = json_decode( $first_call_args[1]['body'] );
+		$this->assertEquals( 'Create', $json->type );
+		$this->assertEquals( $user->get_url(), $json->actor );
+		$this->assertEquals( $user->get_url(), $json->object->attributedTo );
+
+		remove_filter( 'pre_http_request', array( $pre_http_request, 'filter' ), 10 );
+	}
+
 	public function set_up() {
 		parent::set_up();
 		add_filter( 'pre_get_remote_metadata_by_actor', array( get_called_class(), 'pre_get_remote_metadata_by_actor' ), 10, 2 );