class-mastodon-api.php

<?php
/**
 * Friends Mastodon API
 *
 * This contains the REST API handlers.
 *
 * @package Enable_Mastodon_Apps
 */

namespace Enable_Mastodon_Apps;

/**
 * This is the class that implements the Mastodon API endpoints.
 *
 * @since 0.1
 *
 * @package Enable_Mastodon_Apps
 * @author Alex Kirk
 */
class Mastodon_API {
	const ACTIVITYPUB_USERNAME_REGEXP = '(?:([A-Za-z0-9_-]+)@((?:[A-Za-z0-9_-]+\.)+[A-Za-z]+))';
	const VERSION = ENABLE_MASTODON_APPS_VERSION;
	/**
	 * The OAuth handler.
	 *
	 * @var Mastodon_OAuth
	 */
	private $oauth;

	/**
	 * The Mastodon App.
	 *
	 * @var Mastodon_App
	 */
	private $app;

	const PREFIX = 'enable-mastodon-apps';
	const APP_TAXONOMY = 'mastodon-app';
	const REMOTE_USER_TAXONOMY = 'mastodon-api-remote-user';
	const CPT = 'enable-mastodon-apps';

	/**
	 * Constructor
	 */
	public function __construct() {
		Mastodon_App::register_taxonomy();
		$this->oauth = new Mastodon_OAuth();
		$this->register_hooks();
		$this->register_taxonomy();
		$this->register_custom_post_type();
		new Mastodon_Admin( $this->oauth );
	}

	public function register_hooks() {
		add_action( 'wp_loaded', array( $this, 'rewrite_rules' ) );
		add_action( 'query_vars', array( $this, 'query_vars' ) );
		add_action( 'rest_api_init', array( $this, 'add_rest_routes' ) );
		add_filter( 'rest_pre_serve_request', array( $this, 'allow_cors' ), 10, 4 );
		add_filter( 'template_include', array( $this, 'log_404s' ) );
		add_filter( 'activitypub_post', array( $this, 'activitypub_post' ), 10, 2 );
		add_filter( 'enable_mastodon_apps_get_json', array( $this, 'get_json' ), 10, 4 );
		add_action( 'default_option_mastodon_api_default_post_formats', array( $this, 'default_option_mastodon_api_default_post_formats' ) );
	}

	public function allow_cors() {
		header( 'Access-Control-Allow-Origin: *' );
		header( 'Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS' );
		header( 'Access-Control-Allow-Headers: content-type, authorization' );
		header( 'Access-Control-Allow-Credentials: true' );
		if ( 'OPTIONS' === $_SERVER['REQUEST_METHOD'] ) {
			header( 'Access-Control-Allow-Origin: *', true, 204 );
			exit;
		}
	}

	public function register_taxonomy() {
		$args = array(
			'labels'       => array(
				'name'          => 'Mastodon Remote Users',
				'singular_name' => 'Mastodon Remote User',
				'menu_name'     => 'Mastodon Remote Users',
			),
			'public'       => false,
			'show_ui'      => false,
			'show_in_menu' => false,
			'show_in_rest' => false,
			'rewrite'      => false,
		);

		register_taxonomy( self::REMOTE_USER_TAXONOMY, null, $args );
	}

	public function register_custom_post_type() {
		$args = array(
			'labels'       => array(
				'name'          => 'Mapping',
				'singular_name' => 'Mapping',
				'menu_name'     => 'Mappings',
			),
			'public'       => false,
			'show_ui'      => false,
			'show_in_menu' => false,
			'show_in_rest' => false,
			'rewrite'      => false,
		);

		register_post_type( self::CPT, $args );
	}


	public function rewrite_rules() {
		$existing_rules = get_option( 'rewrite_rules' );
		$needs_flush = false;

		$generic = array(
			'api/v1/accounts/relationships',
			'api/v1/accounts/verify_credentials',
			'api/v1/accounts/familiar_followers',
			'api/v1/accounts/search',
			'api/v1/announcements',
			'api/v1/apps',
			'api/v1/bookmarks',
			'api/v1/conversations',
			'api/v1/custom_emojis',
			'api/v1/favourites',
			'api/v1/filters',
			'api/v1/follow_requests',
			'api/v1/followed_tags',
			'api/v1/instance/peers',
			'api/v2/instance',
			'api/v1/instance',
			'api/v1/lists',
			'api/v1/markers',
			'api/v1/mutes',
			'api/v1/notifications/clear',
			'api/v1/preferences',
			'api/v1/trends/statuses',
			'api/v1/push/subscription',
			'api/v1/streaming',
			'api/v2/media',
		);
		$parametrized = array(
			'api/v1/accounts/([^/]+)/featured_tags'  => 'api/v1/accounts/$matches[1]/featured_tags',
			'api/v1/accounts/([^/]+)/follow'         => 'api/v1/accounts/$matches[1]/follow',
			'api/v1/accounts/([^/]+)/unfollow'       => 'api/v1/accounts/$matches[1]/unfollow',
			'api/v1/accounts/([^/]+)/statuses'       => 'api/v1/accounts/$matches[1]/statuses',
			'api/v1/statuses/([0-9]+)/context'       => 'api/v1/statuses/$matches[1]/context',
			'api/v1/statuses/([0-9]+)/favourited_by' => 'api/v1/statuses/$matches[1]/favourited_by',
			'api/v1/statuses/([0-9]+)/favourite'     => 'api/v1/statuses/$matches[1]/favourite',
			'api/v1/statuses/([0-9]+)/unfavourite'   => 'api/v1/statuses/$matches[1]/unfavourite',
			'api/v1/statuses/([0-9]+)/reblog'        => 'api/v1/statuses/$matches[1]/reblog',
			'api/v1/statuses/([0-9]+)/unreblog'      => 'api/v1/statuses/$matches[1]/unreblog',
			'api/v1/notifications/([^/]+)/dismiss'   => 'api/v1/notifications/$matches[1]/dismiss',
			'api/v1/notifications/([^/|$]+)/?$'      => 'api/v1/notifications/$matches[1]',
			'api/v1/notifications'                   => 'api/v1/notifications',
			'api/nodeinfo/([0-9]+[.][0-9]+).json'    => 'api/nodeinfo/$matches[1].json',
			'api/v1/media/([0-9]+)'                  => 'api/v1/media/$matches[1]',
			'api/v1/statuses/([0-9]+)'               => 'api/v1/statuses/$matches[1]',
			'api/v1/statuses'                        => 'api/v1/statuses',
			'api/v1/accounts/(.+)'                   => 'api/v1/accounts/$matches[1]',
			'api/v1/timelines/(home|public)'         => 'api/v1/timelines/$matches[1]',
			'api/v1/timelines/tag/([^/|$]+)'         => 'api/v1/timelines/tag/$matches[1]',
			'api/v2/search'                          => 'api/v1/search',
		);

		foreach ( $generic as $rule ) {
			if ( empty( $existing_rules[ $rule ] ) ) {
				// Add a specific rewrite rule so that we can also catch requests without our prefix.
				$needs_flush = true;
			}
			add_rewrite_rule( '^' . $rule, 'index.php?rest_route=/' . self::PREFIX . '/' . $rule, 'top' );
		}

		foreach ( $parametrized as $rule => $rewrite ) {
			if ( empty( $existing_rules[ $rule ] ) ) {
				// Add a specific rewrite rule so that we can also catch requests without our prefix.
				$needs_flush = true;
			}
			add_rewrite_rule( '^' . $rule, 'index.php?rest_route=/' . self::PREFIX . '/' . $rewrite, 'top' );
		}

		if ( $needs_flush ) {
			global $wp_rewrite;
			$wp_rewrite->flush_rules();
		}
	}
	public function add_rest_routes() {
		register_rest_route(
			self::PREFIX,
			'api/v1/apps',
			array(
				'methods'             => 'POST',
				'callback'            => array( $this, 'api_apps' ),
				'permission_callback' => array( $this, 'public_api_permission' ),
			)
		);
		register_rest_route(
			self::PREFIX,
			'api/v1/announcements',
			array(
				'methods'             => 'GET',
				'callback'            => array( $this, 'api_announcements' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);
		register_rest_route(
			self::PREFIX,
			'api/v1/instance/peers',
			array(
				'methods'             => 'GET',
				'callback'            => '__return_empty_array',
				'permission_callback' => array( $this, 'public_api_permission' ),
			)
		);
		register_rest_route(
			self::PREFIX,
			'api/v1/instance',
			array(
				'methods'             => 'GET',
				'callback'            => array( $this, 'api_instance' ),
				'permission_callback' => array( $this, 'public_api_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v2/instance',
			array(
				'methods'             => 'GET',
				'callback'            => array( $this, 'api_instance_v2' ),
				'permission_callback' => array( $this, 'public_api_permission' ),
			)
		);
		register_rest_route(
			self::PREFIX,
			'api/nodeinfo/2.0.json',
			array(
				'methods'             => 'GET',
				'callback'            => array( $this, 'api_nodeinfo' ),
				'permission_callback' => array( $this, 'public_api_permission' ),
			)
		);
		register_rest_route(
			self::PREFIX,
			'api/v1/follow_requests',
			array(
				'methods'             => 'GET',
				'callback'            => '__return_empty_array',
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);
		register_rest_route(
			self::PREFIX,
			'api/v1/followed_tags',
			array(
				'methods'             => 'GET',
				'callback'            => '__return_empty_array',
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);
		register_rest_route(
			self::PREFIX,
			'api/v1/bookmarks',
			array(
				'methods'             => 'GET',
				'callback'            => '__return_empty_array',
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);
		register_rest_route(
			self::PREFIX,
			'api/v1/conversations',
			array(
				'methods'             => 'GET',
				'callback'            => '__return_empty_array',
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/favourites',
			array(
				'methods'             => 'GET',
				'callback'            => '__return_empty_array',
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);
		register_rest_route(
			self::PREFIX,
			'api/v1/filters',
			array(
				'methods'             => 'GET',
				'callback'            => '__return_empty_array',
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);
		register_rest_route(
			self::PREFIX,
			'api/v1/lists',
			array(
				'methods'             => 'GET',
				'callback'            => '__return_empty_array',
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/markers',
			array(
				'methods'             => 'GET',
				'callback'            => '__return_empty_array',
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/mutes',
			array(
				'methods'             => 'GET',
				'callback'            => '__return_empty_array',
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/notifications/clear',
			array(
				'methods'             => array( 'POST', 'OPTIONS' ),
				'callback'            => array( $this, 'api_notification_clear' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/notifications/(?P<id>[^/]+)/dismiss',
			array(
				'methods'             => array( 'POST', 'OPTIONS' ),
				'callback'            => array( $this, 'api_notification_dismiss' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/notifications/(?P<id>.+)$',
			array(
				'methods'             => array( 'GET', 'OPTIONS' ),
				'callback'            => array( $this, 'api_notification_get' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/notifications',
			array(
				'methods'             => 'GET',
				'callback'            => array( $this, 'api_notifications' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/preferences',
			array(
				'methods'             => 'GET',
				'callback'            => array( $this, 'api_preferences' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/trends/statuses',
			array(
				'methods'             => 'GET',
				'callback'            => '__return_empty_array',
				'permission_callback' => array( $this, 'public_api_permission' ),
			)
		);
		register_rest_route(
			self::PREFIX,
			'api/v1/custom_emojis',
			array(
				'methods'             => 'GET',
				'callback'            => '__return_empty_array',
				'permission_callback' => array( $this, 'public_api_permission' ),
			)
		);      register_rest_route(
			self::PREFIX,
			'api/v1/accounts/familiar_followers',
			array(
				'methods'             => 'GET',
				'callback'            => '__return_empty_array',
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/accounts/verify_credentials',
			array(
				'methods'             => array( 'GET', 'OPTIONS' ),
				'callback'            => array( $this, 'api_verify_credentials' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/accounts/search',
			array(
				'methods'             => array( 'GET', 'OPTIONS' ),
				'callback'            => array( $this, 'api_accounts_search' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v2/media',
			array(
				'methods'             => array( 'POST', 'OPTIONS' ),
				'callback'            => array( $this, 'api_post_media' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/media/(?P<post_id>[0-9]+)',
			array(
				'methods'             => array( 'GET', 'OPTIONS' ),
				'callback'            => array( $this, 'api_get_media' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/media/(?P<post_id>[0-9]+)',
			array(
				'methods'             => array( 'PUT', 'OPTIONS' ),
				'callback'            => array( $this, 'api_update_media' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/statuses',
			array(
				'methods'             => array( 'POST', 'OPTIONS' ),
				'callback'            => array( $this, 'api_submit_post' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/statuses/(?P<post_id>[0-9]+)/context',
			array(
				'methods'             => array( 'GET', 'OPTIONS' ),
				'callback'            => array( $this, 'api_get_post_context' ),
				'permission_callback' => array( $this, 'logged_in_for_private_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/statuses/(?P<post_id>[0-9]+)/favourited_by',
			array(
				'methods'             => array( 'GET', 'OPTIONS' ),
				'callback'            => '__return_empty_array',
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/statuses/(?P<post_id>[0-9]+)/favourite',
			array(
				'methods'             => array( 'POST', 'OPTIONS' ),
				'callback'            => array( $this, 'api_favourite_post' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/statuses/(?P<post_id>[0-9]+)/unfavourite',
			array(
				'methods'             => array( 'POST', 'OPTIONS' ),
				'callback'            => array( $this, 'api_unfavourite_post' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/statuses/(?P<post_id>[0-9]+)/reblog',
			array(
				'methods'             => array( 'POST', 'OPTIONS' ),
				'callback'            => array( $this, 'api_reblog_post' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/statuses/(?P<post_id>[0-9]+)/unreblog',
			array(
				'methods'             => array( 'POST', 'OPTIONS' ),
				'callback'            => array( $this, 'api_unreblog_post' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/statuses/(?P<post_id>[0-9]+)',
			array(
				'methods'             => array( 'DELETE', 'OPTIONS' ),
				'callback'            => array( $this, 'api_delete_post' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/statuses/(?P<post_id>[0-9]+)',
			array(
				'methods'             => array( 'GET', 'OPTIONS' ),
				'callback'            => array( $this, 'api_get_post' ),
				'permission_callback' => array( $this, 'logged_in_for_private_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/timelines/(home)',
			array(
				'methods'             => array( 'GET', 'OPTIONS' ),
				'callback'            => array( $this, 'api_timelines' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/timelines/(tag)/(?P<hashtag>[^/]+)',
			array(
				'methods'             => array( 'GET', 'OPTIONS' ),
				'callback'            => array( $this, 'api_tag_timelines' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/timelines/(public)',
			array(
				'methods'             => array( 'GET', 'OPTIONS' ),
				'callback'            => array( $this, 'api_public_timeline' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/streaming(/public)?(/local)?',
			array(
				'methods'             => array( 'GET', 'OPTIONS' ),
				'callback'            => '__return_empty_array',
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/push/subscription',
			array(
				'methods'             => array( 'GET', 'POST', 'OPTIONS' ),
				'callback'            => array( $this, 'api_push_subscription' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/search',
			array(
				'methods'             => array( 'GET', 'OPTIONS' ),
				'callback'            => array( $this, 'api_search' ),
				'permission_callback' => array( $this, 'have_token_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/accounts/relationships',
			array(
				'methods'             => array( 'GET', 'OPTIONS' ),
				'callback'            => array( $this, 'api_account_relationships' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/accounts/(?P<user_id>[^/]+)/featured_tags',
			array(
				'methods'             => array( 'GET', 'OPTIONS' ),
				'callback'            => '__return_empty_array',
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);
		register_rest_route(
			self::PREFIX,
			'api/v1/accounts/(?P<user_id>[^/]+)/follow',
			array(
				'methods'             => array( 'POST', 'OPTIONS' ),
				'callback'            => array( $this, 'api_account_follow' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/accounts/(?P<user_id>[^/]+)/unfollow',
			array(
				'methods'             => array( 'POST', 'OPTIONS' ),
				'callback'            => array( $this, 'api_account_unfollow' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/accounts/(?P<user_id>[^/]+)/statuses',
			array(
				'methods'             => array( 'GET', 'OPTIONS' ),
				'callback'            => array( $this, 'api_account_statuses' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);

		register_rest_route(
			self::PREFIX,
			'api/v1/accounts/(?P<user_id>[^/]+)$',
			array(
				'methods'             => array( 'GET', 'OPTIONS' ),
				'callback'            => array( $this, 'api_account' ),
				'permission_callback' => array( $this, 'logged_in_permission' ),
			)
		);
	}

	public function query_vars( $query_vars ) {
		$query_vars[] = 'enable-mastodon-apps';
		return $query_vars;
	}

	public function public_api_permission( $request ) {
		$this->allow_cors();
		// Optionally log in.
		$token = $this->oauth->get_token();
		if ( ! $token ) {
			if ( get_option( 'mastodon_api_debug_mode' ) > time() ) {
				$app = Mastodon_App::get_debug_app();
				$app->was_used(
					$request,
					array(
						'user_agent' => $_SERVER['HTTP_USER_AGENT'],
					)
				);
			}
			return true;
		}
		$this->app = Mastodon_App::get_by_client_id( $token['client_id'] );
		$this->app->was_used( $request );
		wp_set_current_user( $token['user_id'] );
		return is_user_logged_in();
	}

	public function log_404s( $template ) {
		if ( ! is_404() ) {
			return $template;
		}
		if ( get_option( 'mastodon_api_debug_mode' ) <= time() ) {
			return $template;
		}
		if ( 0 !== strpos( $_SERVER['REQUEST_URI'], '/api/v' ) ) {
			return $template;
		}
		$request = new \WP_REST_Request( $_SERVER['REQUEST_METHOD'], $_SERVER['REQUEST_URI'] );
		$request->set_query_params( $_GET );
		$request->set_body_params( $_POST );
		$request->set_headers( getallheaders() );
		if ( ! empty( $_SERVER['HTTP_AUTHORIZATION'] ) ) {
			$this->oauth->get_token();
		}
		$app = $this->app;
		if ( ! $app ) {
			$app = Mastodon_App::get_debug_app();
		}
		$app->was_used(
			$request,
			array(
				'user_agent' => $_SERVER['HTTP_USER_AGENT'],
				'status'     => 404,
			)
		);

		return $template;
	}

	public function api_apps( $request ) {
		if ( get_option( 'mastodon_api_disable_logins' ) ) {
			return new \WP_Error( 'registation-disabled', __( 'App registration has been disabled.', 'enable-mastodon-apps' ), array( 'status' => 403 ) );
		}

		try {
			$redirect_uris = $request->get_param( 'redirect_uris' );
			if ( ! $redirect_uris ) {
				$redirect_uris = '';
			}
			if ( ! is_array( $redirect_uris ) ) {
				$redirect_uris = explode( ',', $redirect_uris );
			}
			$app = Mastodon_App::save(
				$request->get_param( 'client_name' ),
				$redirect_uris,
				$request->get_param( 'scopes' ),
				$request->get_param( 'website' )
			);
		} catch ( \Exception $e ) {
			list( $code, $message ) = explode( ',', $e->getMessage(), 2 );
			$app = new \WP_Error( $code, $message, array( 'status' => 422 ) );
		}

		if ( is_wp_error( $app ) ) {
			return $app;
		}

		return array(
			'id'            => $app->get_client_id(),
			'name'          => $app->get_client_name(),
			'website'       => $app->get_website(),
			'redirect_uri'  => implode( ',', is_array( $redirect_uris ) ? $redirect_uris : array( $redirect_uris ) ),
			'client_id'     => $app->get_client_id(),
			'client_secret' => $app->get_client_secret(),

		);
	}

	public function logged_in_permission( $request ) {
		$this->allow_cors();
		$token = $this->oauth->get_token();
		if ( ! $token ) {
			return is_user_logged_in();
		}

		OAuth2\AccessTokenStorage::was_used( $token['access_token'] );
		$this->app = Mastodon_App::get_by_client_id( $token['client_id'] );
		wp_set_current_user( $token['user_id'] );
		$this->app->was_used( $request );
		return is_user_logged_in();
	}

	public function have_token_permission( $request ) {
		$this->allow_cors();
		$token = $this->oauth->get_token();
		if ( ! $token ) {
			return is_user_logged_in();
		}
		OAuth2\AccessTokenStorage::was_used( $token['access_token'] );
		$this->app = Mastodon_App::get_by_client_id( $token['client_id'] );
		$this->app->was_used( $request );
		return true;
	}

	public function logged_in_for_private_permission( $request ) {
		$post_id = $request->get_param( 'post_id' );
		if ( ! $post_id ) {
			return false;
		}

		if ( get_post_status( $post_id ) !== 'publish' ) {
			return $this->logged_in_permission( $request );
		}

		return true;
	}

	public function activitypub_post( $data, $post ) {
		if ( $post->post_parent ) {
			$parent_post = get_post( $post->post_parent );
			$data['inReplyTo'] = $parent_post->guid;
		}

		if ( get_post_meta( $post->ID, 'activitypub_in_reply_to', true ) ) {
			$data['inReplyTo'] = get_post_meta( $post->ID, 'activitypub_in_reply_to', true );
		}

		return $data;
	}

	/**
	 * Set the default post format.
	 *
	 * @param mixed $post_formats The default value to return if the option does not exist
	 *                        in the database.
	 *
	 * @return     array   The potentially modified default value.
	 */
	public function default_option_mastodon_api_default_post_formats( $post_formats ) {
		if ( ! defined( 'FRIENDS_VERSION' ) ) {
			$post_formats = array(
				'standard',
			);
		}

		return $post_formats;
	}

	public function api_verify_credentials( $request ) {
		return $this->get_friend_account_data( get_current_user_id() );
	}

	private function get_posts_query_args( $request ) {
		$limit = $request->get_param( 'limit' );
		if ( $limit < 1 ) {
			$limit = 10;
		}

		$args = array(
			'posts_per_page'   => $limit,
			'post_type'        => apply_filters( 'friends_frontend_post_types', array( 'post' ) ),
			'suppress_filters' => false,
			'post_status'      => array( 'publish', 'private' ),
		);

		$pinned = $request->get_param( 'pinned' );
		if ( $pinned || 'true' === $pinned ) {
			$args['pinned'] = true;
			$args['post__in'] = get_option( 'sticky_posts' );
			if ( empty( $args['post__in'] ) ) {
				// No pinned posts, we need to find nothing.
				$args['post__in'] = array( -1 );
			}
		}

		if ( $this->app ) {
			$args = $this->app->modify_wp_query_args( $args );
		} else {
			$args['tax_query'] = array(
				array(
					'taxonomy' => 'post_format',
					'field'    => 'slug',
					'terms'    => array( 'post-format-status' ),
				),
			);
		}

		$post_id = $request->get_param( 'post_id' );
		if ( $post_id ) {
			$args['p'] = $post_id;
		}

		return $args;
	}

	private function get_posts( $args, $min_id = null, $max_id = null ) {
		if ( $min_id ) {
			$min_filter_handler = function ( $where ) use ( $min_id ) {
				global $wpdb;
				return $where . $wpdb->prepare( " AND {$wpdb->posts}.ID > %d", $min_id );
			};
			add_filter( 'posts_where', $min_filter_handler );
		}

		if ( $max_id ) {
			$max_filter_handler = function ( $where ) use ( $max_id ) {
				global $wpdb;
				return $where . $wpdb->prepare( " AND {$wpdb->posts}.ID < %d", $max_id );
			};
			add_filter( 'posts_where', $max_filter_handler );
		}

		$posts = get_posts( $args );
		if ( $min_id ) {
			remove_filter( 'posts_where', $min_filter_handler );
		}
		if ( $max_id ) {
			remove_filter( 'posts_where', $max_filter_handler );
		}

		$statuses = array();
		foreach ( $posts as $post ) {
			$status = $this->get_status_array( $post );
			if ( $status ) {
				$statuses[ $post->post_date ] = $status;
			}
		}

		if ( ! isset( $args['pinned'] ) || ! $args['pinned'] ) {
			// Comments cannot be pinned for now.
			$comments = get_comments(
				array(
					'meta_key'   => 'protocol',
					'meta_value' => 'activitypub',
				)
			);

			foreach ( $comments as $comment ) {
				$status = $this->get_comment_status_array( $comment );
				if ( $status ) {
					$statuses[ $comment->comment_date ] = $status;
				}
			}
		}
		ksort( $statuses );

		if ( $min_id ) {
			$min_id = strval( $min_id );
			$min_id_exists_in_statuses = false;
			foreach ( $statuses as $status ) {
				if ( $status['id'] === $min_id ) {
					$min_id_exists_in_statuses = true;
					break;
				}
			}
			if ( ! $min_id_exists_in_statuses ) {
				// We don't need to watch the min_id.
				$min_id = null;
			}
		}

		$ret = array();
		$c = $args['posts_per_page'];
		$next_max_id = false;
		foreach ( $statuses as $status ) {
			if ( false === $next_max_id ) {
				$next_max_id = $status['id'];
			}
			if ( $min_id ) {
				if ( $status['id'] !== $min_id ) {
					continue;
				}
				// We can now include results but need to skip this one.
				$min_id = null;
				continue;
			}
			if ( $max_id && strval( $max_id ) === $status['id'] ) {
				break;
			}
			if ( $c-- <= 0 ) {
				break;
			}
			array_unshift( $ret, $status );
		}

		if ( ! empty( $ret ) ) {
			if ( $next_max_id ) {
				header( 'Link: <' . add_query_arg( 'max_id', $next_max_id, home_url( strtok( $_SERVER['REQUEST_URI'], '?' ) ) ) . '>; rel="next"', false );
			}
			header( 'Link: <' . add_query_arg( 'min_id', $ret[0]['id'], home_url( strtok( $_SERVER['REQUEST_URI'], '?' ) ) ) . '>; rel="prev"', false );
		}

		return $ret;
	}

	private function get_comment_status_array( \WP_Comment $comment ) {
		$post = (object) array(
			'ID'           => $this->remap_comment_id( $comment->comment_ID ),
			'guid'         => $comment->guid . '#comment-' . $comment->comment_ID,
			'post_author'  => $comment->user_id,
			'post_content' => $comment->comment_content,
			'post_date'    => $comment->comment_date,
			'post_status'  => $comment->post_status,
			'post_type'    => $comment->post_type,
			'post_title'   => '',
		);

		return $this->get_status_array(
			$post,
			array(
				'in_reply_to_id' => $comment->comment_post_ID,
			)
		);
	}

	private function get_user_id_from_request( $request ) {
		$user_id = $request->get_param( 'user_id' );

		if ( $user_id > 1e10 ) {
			$remote_user_id = get_term_by( 'id', intval( $user_id ) - 1e10, self::REMOTE_USER_TAXONOMY );
			if ( $remote_user_id ) {
				return $remote_user_id->name;
			}
		}

		return $user_id;
	}

	/**
	 * Strip empty whitespace
	 *
	 * @param      string $post_content  The post content.
	 *
	 * @return     string  The normalized content.
	 */
	private function normalize_whitespace( $post_content ) {
		$post_content = preg_replace( '#<!-- /?wp:paragraph -->\s*<!-- /?wp:paragraph -->#', PHP_EOL, $post_content );
		$post_content = preg_replace( '#\n\s*\n+#', PHP_EOL, $post_content );
		$post_content = str_replace( '&#039;', "'", $post_content );

		return trim( $post_content );
	}

	private function get_status_array( $post, $data = array() ) {
		$meta = get_post_meta( $post->ID, 'activitypub', true );
		$feed_url = get_post_meta( $post->ID, 'feed_url', true );

		$user_id = $post->post_author;
		if ( class_exists( '\Friends\User' ) && $post instanceof \WP_Post ) {
			$user = \Friends\User::get_post_author( $post );
			$user_id = $user->ID;
		} elseif ( isset( $meta['attributedTo']['id'] ) && $meta['attributedTo']['id'] ) {
			// It's an ActivityPub post, so the feed_url is the ActivityPub URL.
			if ( $feed_url ) {
				$user_id = $feed_url;
			} else {
				$user_id = $meta['attributedTo']['id'];
			}
		}

		if ( ! $user_id ) {
			return null;
		}
		$account_data = $this->get_friend_account_data( $user_id, $meta );
		if ( is_wp_error( $account_data ) ) {
			return null;
		}

		$reblogged = get_post_meta( $post->ID, 'reblogged' );
		$reblogged_by = array();
		if ( $reblogged ) {
			$reblog_user_ids = get_post_meta( $post->ID, 'reblogged_by' );
			if ( ! is_array( $reblog_user_ids ) ) {
				$reblog_user_ids = array();
			}
			$reblog_user_ids = array_map( 'intval', $reblog_user_ids );
			$reblogged_by = array_map(
				function ( $user_id ) {
					return $this->get_friend_account_data( $user_id );
				},
				$reblog_user_ids
			);
			$reblogged = in_array( get_current_user_id(), $reblog_user_ids, true );
		} else {
			$reblogged = false;
		}

		$data = array_merge(
			array(
				'id'                     => strval( $post->ID ),
				'created_at'             => mysql2date( 'Y-m-d\TH:i:s.000P', $post->post_date, false ),
				'in_reply_to_id'         => null,
				'in_reply_to_account_id' => null,
				'sensitive'              => false,
				'spoiler_text'           => '',
				'visibility'             => 'publish' === $post->post_status ? 'public' : 'unlisted',
				'language'               => null,
				'uri'                    => $post->guid,
				'url'                    => null,
				'replies_count'          => 0,
				'reblogs_count'          => 0,
				'favourites_count'       => 0,
				'edited_at'              => null,
				'favourited'             => false,
				'reblogged'              => $reblogged,
				'reblogged_by'           => $reblogged_by,
				'muted'                  => false,
				'bookmarked'             => false,
				'content'                => $this->normalize_whitespace( $post->post_title . PHP_EOL . $post->post_content ),
				'filtered'               => array(),
				'reblog'                 => null,
				'account'                => $account_data,
				'media_attachments'      => array(),
				'mentions'               => array(),
				'tags'                   => array(),
				'emojis'                 => array(),
				'pinned'                 => is_sticky( $post->ID ),
				'card'                   => null,
				'poll'                   => null,
			),
			$data
		);

		if ( ! $reblogged ) {
			unset( $data['reblogged_by'] );
		}

		if ( ! $data['pinned'] ) {
			unset( $data['pinned'] );
		}

		// get the attachments for the post.
		$attachments = get_attached_media( '', $post->ID );
		$p = strpos( $data['content'], '<!-- wp:image' );
		while ( false !== $p ) {
			$e = strpos( $data['content'], '<!-- /wp:image', $p );
			if ( ! $e ) {
				break;
			}
			$img = substr( $data['content'], $p, $e - $p + 19 );
			if ( preg_match( '#<img(?:\s+src="(?P<url>[^"]+)"|\s+width="(?P<width>\d+)"|\s+height="(?P<height>\d+)"|\s+class="(?P<class>[^"]+)|\s+.*="[^"]+)+"#i', $img, $img_tag ) ) {
				if ( ! empty( $img_tag['url'] ) ) {
					$url = $img_tag['url'];
					$media_id = crc32( $url );
					$img_meta = array();
					foreach ( $attachments as $attachment_id => $attachment ) {
						if (
						wp_get_attachment_url( $attachment_id ) === $url
						|| ( isset( $img_tag['class'] ) && preg_match( '#\bwp-image-' . $attachment_id . '\b#', $img_tag['class'] ) )

						) {
							$media_id = $attachment_id;
							$attachment_metadata = \wp_get_attachment_metadata( $attachment_id );
							$img_tag['width'] = $attachment_metadata['width'];
							$img_tag['height'] = $attachment_metadata['height'];
							unset( $attachments[ $attachment_id ] );

							$img_meta['original'] = array(
								'width'  => intval( $img_tag['width'] ),
								'height' => intval( $img_tag['height'] ),
								'size'   => $img_tag['width'] . 'x' . $img_tag['height'],
								'aspect' => $img_tag['width'] / max( 1, $img_tag['height'] ),
							);

							break;
						}
					}
					$data['media_attachments'][] = array(
						'id'                 => strval( $media_id ),
						'type'               => 'image',
						'url'                => $url,
						'preview_remote_url' => $url,
						'remote_url'         => $url,
						'preview_url'        => $url,
						'text_url'           => $url,
						'meta'               => array_merge(
							$img_meta,
							array(
								'description' => isset( $attachment ) && $attachment ? $attachment->post_excerpt : '',
							)
						),
					);
				}
			}
			$data['content'] = trim( substr( $data['content'], 0, $p ) . substr( $data['content'], $e + 19 ) );
			$p = strpos( $data['content'], '<!-- wp:image' );
		}

		foreach ( $attachments as $attachment_id => $attachment ) {
			$url = wp_get_attachment_url( $attachment_id );
			$attachment_metadata = wp_get_attachment_metadata( $attachment_id );

			$type = 'image';
			if ( preg_match( '#^image/#', $attachment_metadata['mime-type'] ) || preg_match( '#\.(gif|png|jpe?g)$#i', $url ) ) {
				$type = 'image';
			} elseif ( preg_match( '#^audio/#', $attachment_metadata['mime-type'] ) || preg_match( '#\.(mp3|m4a|wav|aiff)$#i', $url ) ) {
				$type = 'audio';
			} elseif ( preg_match( '#^video/#', $attachment_metadata['mime-type'] ) || preg_match( '#\.(mov|mkv|mp4)$#i', $url ) ) {
				$type = 'video';
			}

			$data['media_attachments'][] = array(
				'id'          => $attachment_id,
				'type'        => $type,
				'url'         => $url,
				'preview_url' => $url,
				'text_url'    => $url,
				'meta'        => array(
					'original' => array(
						'width'  => intval( $attachment_metadata['width'] ),
						'height' => intval( $attachment_metadata['height'] ),
						'size'   => $attachment_metadata['width'] . 'x' . $attachment_metadata['height'],
						'aspect' => $attachment_metadata['width'] / max( 1, $attachment_metadata['height'] ),
					),
				),
				'description' => $attachment->post_excerpt,
			);
		}
		$author_name = $data['account']['display_name'];
		$override_author_name = get_post_meta( $post->ID, 'author', true );

		if ( isset( $meta['reblog'] ) && $meta['reblog'] && isset( $meta['attributedTo']['id'] ) ) {
			$data['reblog'] = $data;
			$data['reblog']['id'] = $this->remap_reblog_id( $data['reblog']['id'] ); // ensure that the id is different from the post as it might crash some clients (Ivory).
			$data['media_attachments'] = array();
			$data['mentions'] = array();
			$data['tags'] = array();
			unset( $data['pinned'] );
			$data['content'] = '';
			$data['reblog']['account'] = $this->get_friend_account_data( $this->get_acct( $meta['attributedTo']['id'] ), $meta );
			if ( ! $data['reblog']['account']['acct'] ) {
				$data['reblog'] = null;
			}
		} elseif ( $override_author_name && $author_name !== $override_author_name ) {
			$data['account']['display_name'] = $override_author_name;
		}

		$reactions = apply_filters( 'friends_get_user_reactions', array(), $post->ID );
		if ( ! empty( $reactions ) ) {
			$data['favourited'] = true;
		}

		return $data;
	}

	private function get_notification_array( $type, $date, $account, $status = array() ) {
		$notification = array(
			'id'         => preg_replace( '/[^0-9]/', '', $date ),
			'created_at' => $date,
		);
		switch ( $type ) {
			// As per https://docs.joinmastodon.org/entities/Notification/.
			case 'mention': // Someone mentioned you in their status.
			case 'status': // Someone you enabled notifications for has posted a status.
			case 'reblog': // Someone boosted one of your statuses.
			case 'follow': // Someone followed you.
			case 'follow_request': // Someone requested to follow you.
			case 'favourite': // Someone favourited one of your statuses.
			case 'poll': // A poll you have voted in or created has ended.
			case 'update': // A status you interacted with has been edited.
				$notification['type'] = $type;
				break;
			default:
				return array();
		}

		if ( $account ) {
			$notification['account'] = $account;
		}

		if ( $status ) {
			$notification['status'] = $status;
			$notification['id'] .= $status['id'];
		}

		return $notification;
	}

	public function api_submit_post( $request ) {
		$status = $request->get_param( 'status' );
		if ( empty( $status ) ) {
			return new \WP_Error( 'mastodon_api_submit_post', 'Validation failed: Text can\'t be blank', array( 'status' => 422 ) );
		}

		$status = make_clickable( $status );
		if ( class_exists( '\Activitypub\Mention' ) ) {
			$status = \Activitypub\Mention::the_content( $status );
		}
		$status = trim( $status );

		$visibility = $request->get_param( 'visibility' );
		if ( empty( $visibility ) ) {
			$visibility = 'public';
		}
		$post_data = array();

		$parent_post    = false;
		$parent_post_id = $request->get_param( 'in_reply_to_id' );
		if ( ! empty( $parent_post_id ) ) {
			$parent_post = get_post( $parent_post_id );
			if ( $parent_post && get_option( 'mastodon_api_reply_as_comment' ) ) {
				$user = wp_get_current_user();

				$commentdata = array(
					'comment_post_ID'      => $parent_post_id,
					'comment_author'       => $user->user_nicename,
					'user_id'              => get_current_user_id(),
					'comment_author_email' => $user->user_email,
					'comment_author_url'   => $user->user_url,
					'comment_content'      => $status,
					'comment_type'         => 'comment',
					'comment_parent'       => 0,
					'comment_meta'         => array(
						'protocol' => 'activitypub',
					),
				);

				\remove_action( 'check_comment_flood', 'check_comment_flood_db', 10 );

				$id = \wp_new_comment( $commentdata, true );
				if ( is_wp_error( $id ) ) {
					return $id;
				}

				\add_action( 'check_comment_flood', 'check_comment_flood_db', 10, 4 );

				return $this->get_comment_status_array( get_comment( $id ) );
			}

			if ( ! $parent_post ) {
				$post_data['post_meta_input'] = array(
					'activitypub_in_reply_to' => $parent_post_id,
				);
			}
		}

		$post_data['post_content'] = $status;
		$post_data['post_status']  = 'public' === $visibility ? 'publish' : 'private';
		$post_data['post_type']    = 'post';
		$post_data['post_title']   = '';

		$app_post_formats = $this->app->get_post_formats();
		if ( empty( $app_post_formats ) ) {
			$app_post_formats = array( 'status' );
		}
		$post_format = apply_filters( 'mastodon_api_new_post_format', $app_post_formats[0] );
		if ( 'standard' === $post_format ) {
			// Use the first line of a post as the post title if we're using a standard post format.
			list( $post_title, $post_content ) = explode( PHP_EOL, $post_data['post_content'], 2 );
			$post_data['post_title']   = $post_title;
			$post_data['post_content'] = trim( $post_content );
		}

		if ( $parent_post ) {
			$post_data['post_parent'] = $parent_post->ID;
		}

		$scheduled_at = $request->get_param( 'scheduled_at' );
		if ( $scheduled_at ) {
			$post_data['post_status'] = 'future';
			$post_data['post_date'] = $scheduled_at;
		}

		$media_ids = $request->get_param( 'media_ids' );
		if ( ! empty( $media_ids ) ) {
			foreach ( $media_ids as $media_id ) {
				$media = get_post( $media_id );
				if ( ! $media ) {
					return new \WP_Error( 'mastodon_api_submit_post', 'Media not found', array( 'status' => 400 ) );
				}
				if ( 'attachment' !== $media->post_type ) {
					return new \WP_Error( 'mastodon_api_submit_post', 'Media not found', array( 'status' => 400 ) );
				}
				$attachment = \wp_get_attachment_metadata( $media_id );
				$post_data['post_content'] .= PHP_EOL;
				$post_data['post_content'] .= '<!-- wp:image -->';
				$post_data['post_content'] .= '<p><img src="' . esc_url( wp_get_attachment_url( $media_id ) ) . '" width="' . esc_attr( $attachment['width'] ) . '"  height="' . esc_attr( $attachment['height'] ) . '" class="size-full" /></p>';
				$post_data['post_content'] .= '<!-- /wp:image -->';
			}
		}

		$post_id = wp_insert_post( $post_data );
		if ( is_wp_error( $post_id ) ) {
			return $post_id;
		}

		if ( 'standard' !== $post_format ) {
			set_post_format( $post_id, $post_format );
		}

		if ( ! empty( $media_ids ) ) {
			foreach ( $media_ids as $media_id ) {
				wp_update_post(
					array(
						'ID'          => $media_id,
						'post_parent' => $post_id,
					)
				);
			}
		}

		if ( $scheduled_at ) {
			return array(
				'id'           => $post_id,
				'scheduled_at' => $scheduled_at,
				'params'       => array(
					'text'         => $status,
					'visibility'   => $visibility,
					'scheduled_at' => $scheduled_at,
				),
			);
		}
		return $this->get_status_array( get_post( $post_id ) );
	}

	public function api_get_media( $request ) {
		$post_id = $request->get_param( 'post_id' );
		if ( ! is_numeric( $post_id ) || $post_id < 0 ) {
			return new \WP_Error( 'mastodon_api_get_media', 'Invalid post ID', array( 'status' => 400 ) );
		}
		$attachment = wp_get_attachment_metadata( $post_id );
		$post = get_post( $post_id );
		return array(
			'id'          => $post_id,
			'type'        => 'image',
			'url'         => wp_get_attachment_url( $post_id ),
			'preview_url' => wp_get_attachment_url( $post_id ),
			'height'      => $attachment['height'],
			'width'       => $attachment['width'],
			'description' => $post->post_excerpt,
		);
	}

	public function api_post_media( $request ) {
		$media = $request->get_file_params();
		if ( empty( $media ) ) {
			return new \WP_Error( 'mastodon_api_post_media', 'Media is empty', array( 'status' => 422 ) );
		}

		require_once ABSPATH . 'wp-admin/includes/media.php';
		require_once ABSPATH . 'wp-admin/includes/file.php';
		require_once ABSPATH . 'wp-admin/includes/image.php';

		if ( ! isset( $media['file']['name'] ) || false === strpos( $media['file']['name'], '.' ) ) {
			switch ( $media['file']['type'] ) {
				case 'image/png':
					$media['file']['name'] = 'image.png';
					break;
				case 'image/jpeg':
					$media['file']['name'] = 'image.jpg';
					break;
				case 'image/gif':
					$media['file']['name'] = 'image.gif';
					break;
			}
		}
		$attachment_id = \media_handle_sideload( $media['file'] );
		if ( is_wp_error( $attachment_id ) ) {
			return new \WP_Error( 'mastodon_api_post_media', $attachment_id->get_error_message(), array( 'status' => 422 ) );
		}

		$description = $request->get_param( 'description' );
		if ( $description ) {
			wp_update_post(
				array(
					'ID'           => $attachment_id,
					'post_excerpt' => $description,
				)
			);
		}

		$thumb = \wp_get_attachment_image_src( $attachment_id, 'thumbnail' );
		$meta = \wp_get_attachment_metadata( $attachment_id );

		return array(
			'id'          => strval( $attachment_id ),
			'type'        => 'image',
			'url'         => \wp_get_attachment_url( $attachment_id ),
			'preview_url' => $thumb[0],
			'text_url'    => \wp_get_attachment_url( $attachment_id ),
			'description' => $description,
			'meta'        => array(
				'original' => array(
					'width'  => $meta['width'],
					'height' => $meta['height'],
					'size'   => $meta['width'] . 'x' . $meta['height'],
					'aspect' => $meta['width'] / $meta['height'],
				),
				'small'    => array(
					'width'  => $thumb[1],
					'height' => $thumb[2],
					'size'   => $thumb[1] . 'x' . $thumb[2],
					'aspect' => $thumb[1] / $thumb[2],
				),
			),
		);
	}

	public function api_update_media( $request ) {
		$post_id = $request->get_param( 'post_id' );
		if ( ! is_numeric( $post_id ) || $post_id < 0 ) {
			return new \WP_Error( 'mastodon_api_get_media', 'Invalid post ID', array( 'status' => 400 ) );
		}

		$description = $request->get_param( 'description' );
		if ( $description ) {
			wp_update_post(
				array(
					'ID'           => $post_id,
					'post_excerpt' => $description,
				)
			);
		}
		return $this->api_get_media( $request );
	}

	public function api_timelines( $request ) {
		$args = $this->get_posts_query_args( $request );
		if ( empty( $args ) ) {
			return array();
		}
		$args = apply_filters( 'mastodon_api_timelines_args', $args, $request );

		return $this->get_posts( $args, $request->get_param( 'min_id' ), $request->get_param( 'max_id' ) );
	}

	public function api_tag_timelines( $request ) {
		$args = $this->get_posts_query_args( $request );
		$args['tag'] = $request->get_param( 'hashtag' );
		$args = apply_filters( 'mastodon_api_timelines_args', $args, $request );

		return $this->get_posts( $args, $request->get_param( 'min_id' ), $request->get_param( 'max_id' ) );
	}

	public function api_accounts_search( $request ) {
		$request->set_param( 'type', 'accounts' );
		$ret = $this->api_search( $request );
		return $ret['accounts'];
	}

	public function api_search( $request ) {
		$type = $request->get_param( 'type' );
		$ret = array(
			'accounts' => array(),
			'statuses' => array(),
		);
		if ( ! $type || 'accounts' === $type ) {
			if ( preg_match( '/^@?' . self::ACTIVITYPUB_USERNAME_REGEXP . '$/i', $request->get_param( 'q' ) ) && ! $request->get_param( 'offset' ) ) {
				$ret['accounts'][] = $this->get_friend_account_data( $request->get_param( 'q' ), array(), true );
			}
			$query = new \WP_User_Query(
				array(
					'search'         => '*' . $request->get_param( 'q' ) . '*',
					'search_columns' => array(
						'user_login',
						'user_nicename',
						'user_email',
						'user_url',
						'display_name',
					),
					'offset'         => $request->get_param( 'offset' ),
					'number'         => $request->get_param( 'limit' ),
				)
			);
			$users = $query->get_results();
			foreach ( $users as $user ) {
				$ret['accounts'][] = $this->get_friend_account_data( $user->ID );
			}
		}
		if ( ! $type || 'statuses' === $type ) {
			$args = $this->get_posts_query_args( $request );
			if ( empty( $args ) ) {
				return array();
			}
			$args = apply_filters( 'mastodon_api_timelines_args', $args, $request );
			$valid_url = wp_parse_url( $request->get_param( 'q' ) );
			if ( $valid_url && isset( $valid_url['host'] ) ) {
				if ( ! $request->get_param( 'offset' ) ) {
					$url = $request->get_param( 'q' );
					$json = $this->get_json( $url, crc32( $url ) );
					if ( ! is_wp_error( $json ) && isset( $json['id'], $json['attributedTo'] ) ) {
						$user_id = $this->get_acct( $json['attributedTo'] );
						$ret['statuses'][] = $this->convert_activity_to_status(
							array(
								'id'     => $json['id'] . '#create-activity',
								'object' => $json,

							),
							$user_id
						);
					}
				}
			} elseif ( is_user_logged_in() ) {
				$args['s'] = $request->get_param( 'q' );
				$args['offset'] = $request->get_param( 'offset' );
				$args['posts_per_page'] = $request->get_param( 'limit' );
				$ret['statuses'] = array_merge( $ret['statuses'], $this->get_posts( $args ) );
			}
		}
		return $ret;
	}

	public function api_push_subscription( $request ) {
		return array();
	}

	public function api_public_timeline( $request ) {
		return array();
	}

	public function api_get_post_context( $request ) {
		$post_id = $request->get_param( 'post_id' );
		if ( ! $post_id ) {
			return false;
		}

		$post_id = $this->maybe_get_remapped_reblog_id( $post_id );

		$context = array(
			'ancestors'   => array(),
			'descendants' => array(),
		);

		$meta = get_post_meta( $post_id, 'activitypub', true );
		if ( $meta ) {
			$transient_key = 'mastodon_api_get_post_context_' . $post_id;
			$saved_context = get_transient( $transient_key );
			if ( $saved_context ) {
				// $context = $saved_context;
			} else {
				$post = get_post( $post_id );
				if ( preg_match( '#^https://([^/]+)/(?:users/)?[^/]+(?:/statuses)?/(.+)$#', $post->guid, $matches ) ) {
					$domain = $matches[1];
					$id = $matches[2];
					$context_api_url = 'https://' . $domain . '/api/v1/statuses/' . $id . '/context';
					$response = wp_safe_remote_get(
						$context_api_url,
						array(
							'timeout'     => apply_filters( 'friends_http_timeout', 20 ),
							'redirection' => 1,
						)
					);

					if ( ! is_wp_error( $response ) ) {
						$context = json_decode( wp_remote_retrieve_body( $response ), true );
						if ( isset( $context['error'] ) ) {
							$context = array_merge(
								$context,
								array(
									'ancestors'   => array(),
									'descendants' => array(),
								)
							);
						} else {
							foreach ( $context as $key => $posts ) {
								foreach ( $posts as $index => $post ) {
									if ( false === strpos( $post['account']['acct'], '@' ) ) {
										$post['account']['acct'] .= '@' . $domain;
									}
									$context[ $key ][ $index ]['account']['id'] = $post['account']['acct'];
								}
							}
						}

						set_transient( $transient_key, $context, HOUR_IN_SECONDS );
					}
				}
			}
		}

		$comment_id = $this->get_remapped_comment_id( $post_id );
		if ( $comment_id ) {
			$comment = get_comment( $comment_id );
			$post_id = $comment->comment_post_ID;
			$status = $this->get_status_array( get_post( $post_id ) );
			if ( $status ) {
				$context['ancestors'][] = $status;
			}
		}

		foreach ( get_comments( array( 'post_id' => $post_id ) ) as $comment ) {
			if ( intval( $comment->comment_ID ) === $comment_id ) {
				continue;
			}
			$status = $this->get_comment_status_array( $comment );
			if ( $status ) {
				$context['descendants'][] = $status;
			}
		}

		return $context;
	}

	public function api_favourite_post( $request ) {
		$post_id = $request->get_param( 'post_id' );
		if ( ! $post_id ) {
			return false;
		}

		$post_id = $this->maybe_get_remapped_reblog_id( $post_id );

		// 2b50 = star
		// 2764 = heart
		do_action( 'mastodon_api_react', $post_id, '2b50' );

		$post = get_post( $post_id );

		return $this->get_status_array( $post );
	}

	public function api_unfavourite_post( $request ) {
		$post_id = $request->get_param( 'post_id' );
		if ( ! $post_id ) {
			return false;
		}

		$post_id = $this->maybe_get_remapped_reblog_id( $post_id );

		// 2b50 = star
		// 2764 = heart
		do_action( 'mastodon_api_unreact', $post_id, '2b50' );

		$post = get_post( $post_id );

		return $this->get_status_array( $post );
	}

	public function api_reblog_post( $request ) {
		$post_id = $request->get_param( 'post_id' );
		if ( ! $post_id ) {
			return false;
		}

		$post_id = $this->maybe_get_remapped_reblog_id( $post_id );

		$post = get_post( $post_id );

		if ( $post ) {
			do_action( 'mastodon_api_reblog', $post );
		}
		$post = get_post( $post_id );

		return $this->get_status_array( $post );
	}

	public function api_unreblog_post( $request ) {
		$post_id = $request->get_param( 'post_id' );
		if ( ! $post_id ) {
			return false;
		}

		$post_id = $this->maybe_get_remapped_reblog_id( $post_id );

		$post = get_post( $post_id );
		if ( $post ) {
			do_action( 'mastodon_api_unreblog', $post );
		}
		$post = get_post( $post_id );

		return $this->get_status_array( $post );
	}

	public function api_delete_post( $request ) {
		$post_id = $request->get_param( 'post_id' );
		if ( ! $post_id ) {
			return false;
		}

		$comment_id = $this->get_remapped_comment_id( $post_id );
		if ( $comment_id ) {
			$comment = get_comment( $comment_id );
			if ( intval( $comment->user_id ) === get_current_user_id() ) {
				wp_trash_comment( $comment_id );
			}
			return $this->get_comment_status_array( get_comment( $comment_id ) );
		}

		$post = get_post( $post_id );
		if ( intval( $post->post_author ) === get_current_user_id() ) {
			wp_trash_post( $post_id );
		}

		return $this->get_status_array( get_post( $post_id ) );
	}

	public function api_get_post( $request ) {
		$post_id = $request->get_param( 'post_id' );
		if ( ! $post_id ) {
			return false;
		}

		$comment_id = $this->get_remapped_comment_id( $post_id );
		if ( $comment_id ) {
			return $this->get_comment_status_array( get_comment( $comment_id ) );
		}

		return $this->get_status_array( get_post( $post_id ) );
	}

	private function convert_outbox_to_status( $outbox, $user_id ) {
		$items = array();
		foreach ( $outbox['orderedItems'] as $item ) {
			$status = $this->convert_activity_to_status( $item, $user_id );
			if ( $status ) {
				$items[] = $status;
			}
		}
		return $items;
	}

	public function convert_activity_to_status( $activity, $user_id ) {
		if ( ! isset( $activity['object']['type'] ) || 'Note' !== $activity['object']['type'] ) {
			return null;
		}

		$id_parts = explode( '/', $activity['object']['id'] );
		return array(
			'id'                     => array_pop( $id_parts ),
			'created_at'             => $activity['object']['published'],
			'in_reply_to_id'         => $activity['object']['inReplyTo'],
			'in_reply_to_account_id' => null,
			'sensitive'              => $activity['object']['sensitive'],
			'spoiler_text'           => '',
			'language'               => null,
			'uri'                    => $activity['object']['id'],
			'url'                    => $activity['object']['url'],
			'muted'                  => false,
			'replies_count'          => 0, // could be fetched.
			'reblogs_count'          => 0,
			'favourites_count'       => 0,
			'edited_at'              => null,
			'favourited'             => false,
			'reblogged'              => false,
			'muted'                  => false,
			'bookmarked'             => false,
			'content'                => $activity['object']['content'],
			'filtered'               => array(),
			'reblog'                 => null,
			'account'                => $this->get_friend_account_data( $user_id ),
			'media_attachments'      => array_map(
				function ( $attachment ) {
					return array(
						'id'          => crc32( $attachment['url'] ),
						'type'        => strtok( $attachment['mediaType'], '/' ),
						'url'         => $attachment['url'],
						'preview_url' => $attachment['url'],
						'text_url'    => $attachment['url'],
						'meta'        => array(
							'original' => array(
								'width'  => intval( $attachment['width'] ),
								'height' => intval( $attachment['height'] ),
								'size'   => $attachment['width'] . 'x' . $attachment['height'],
								'aspect' => $attachment['width'] / max( 1, $attachment['height'] ),
							),
						),
						'description' => ! empty( $attachment['description'] ) ? $attachment['description'] : '',
					);
				},
				$activity['object']['attachment']
			),
			'mentions'               => array_values(
				array_map(
					function ( $mention ) {
						return array(
							'id'       => $mention['href'],
							'username' => $mention['name'],
							'acct'     => $mention['name'],
							'url'      => $mention['href'],
						);
					},
					array_filter(
						$activity['object']['tag'],
						function ( $tag ) {
							if ( isset( $tag['type'] ) ) {
								return 'Mention' === $tag['type'];
							}
							return false;
						}
					)
				)
			),

			'tags'                   => array_values(
				array_map(
					function ( $tag ) {
						return array(
							'name' => $tag['name'],
							'url'  => $tag['href'],
						);
					},
					array_filter(
						$activity['object']['tag'],
						function ( $tag ) {
							if ( isset( $tag['type'] ) ) {
								return 'Hashtag' === $tag['type'];
							}
							return false;
						}
					)
				)
			),

			'emojis'                 => array(),
			'card'                   => null,
			'poll'                   => null,
		);
	}

	public function api_account_statuses( $request ) {
		$user_id = $this->get_user_id_from_request( $request );

		if ( preg_match( '/^@?' . self::ACTIVITYPUB_USERNAME_REGEXP . '$/i', $user_id ) ) {
			$url = $this->get_activitypub_url( $user_id );
			if ( $url ) {
				$account = $this->get_acct( $user_id );
				$meta = apply_filters( 'friends_get_activitypub_metadata', array(), $url );
				if ( $meta && ! is_wp_error( $meta ) ) {
					$outbox = $this->get_json( $meta['outbox'], 'outbox-' . $account, array( 'first' => null ) );
					$outbox_page = $this->get_json( $outbox['first'], 'outboxpage-' . $account, array( 'orderedItems' => array() ) );

					$items = $this->convert_outbox_to_status( $outbox_page, $user_id );
					return $items;
				}
			}
		}

		$args = $this->get_posts_query_args( $request );
		if ( empty( $args ) ) {
			return array();
		}
		$args['author'] = $user_id;
		if ( class_exists( '\Friends\User' ) ) {
			$user = \Friends\User::get_user_by_id( $user_id );

			if (
				$user instanceof \Friends\User
				&& method_exists( $user, 'modify_get_posts_args_by_author' )
			) {
				$args = $user->modify_get_posts_args_by_author( $args );
			}
		}

		$args = apply_filters( 'mastodon_api_account_statuses_args', $args, $request );

		return $this->get_posts( $args );
	}

	public function api_account_follow( $request ) {
		$user_id = $this->get_user_id_from_request( $request );
		$relationships = array();

		$user = \Friends\User::get_user_by_id( $user_id );
		if ( $user ) {
			foreach ( $user->get_feeds() as $feed ) {
				if ( $feed->get_parser() !== 'activitypub' ) {
					continue;
				}

				if ( ! $feed->is_active() ) {
					$feed->activate();
				}
			}

			$request->set_param( 'id', $user->ID );
			$relationships = $this->api_account_relationships( $request );
		} elseif ( preg_match( '/^@?' . self::ACTIVITYPUB_USERNAME_REGEXP . '$/i', $user_id ) ) {
			$url = $this->get_activitypub_url( $user_id );
			$meta = apply_filters( 'friends_get_activitypub_metadata', array(), $url );

			$vars = array();
			if ( ! empty( $meta['name'] ) ) {
				$vars['display_name'] = $meta['name'];
			}

			$new_user_id = apply_filters( 'friends_create_and_follow', $user_id, $url, 'application/activity+json', $vars );
			if ( is_wp_error( $new_user_id ) ) {
				return $new_user_id;
			}

			$request->set_param( 'id', $new_user_id );
			$relationships = $this->api_account_relationships( $request );
		}

		if ( empty( $relationships ) ) {
			return new \WP_Error( 'invalid-user', 'Invalid user', array( 'status' => 404 ) );
		}

		return $relationships[0];
	}

	public function api_account_unfollow( $request ) {
		$user_id = $this->get_user_id_from_request( $request );
		$relationships = array();

		if ( is_numeric( $user_id ) && class_exists( '\Friends\User' ) ) {
			$user = \Friends\User::get_user_by_id( $user_id );
			if ( ! $user || is_wp_error( $user ) ) {
				return array();
			}

			foreach ( $user->get_feeds() as $feed ) {
				if ( $feed->get_parser() !== 'activitypub' ) {
					continue;
				}
				if ( $feed->is_active() ) {
					$feed->deactivate();
				}
			}

			$request->set_param( 'id', $user->ID );
			$relationships = $this->api_account_relationships( $request );
		}

		if ( empty( $relationships ) ) {
			return new \WP_Error( 'invalid-user', 'Invalid user', array( 'status' => 404 ) );
		}

		return $relationships[0];
	}

	public function api_account_relationships( $request ) {
		$relationships = array();
		$user_ids = $request->get_param( 'id' );
		if ( ! is_array( $user_ids ) ) {
			$user_ids = array( $user_ids );
		}

		foreach ( $user_ids as $user_id ) {
			$relationship = array(
				'id'                   => $user_id,
				'following'            => false,
				'showing_reblogs'      => false,
				'notifying'            => false,
				'followed_by'          => false,
				'blocking'             => false,
				'blocked_by'           => false,
				'muting'               => false,
				'muting_notifications' => false,
				'requested'            => false,
				'domain_blocking'      => false,
				'endorsed'             => false,
				'note'                 => '',
			);

			if ( $user_id > 1e10 ) {
				$remote_user_id = get_term_by( 'id', $user_id - 1e10, self::REMOTE_USER_TAXONOMY );
				if ( $remote_user_id ) {
					$user_id = $remote_user_id->name;
				}
			}

			if ( class_exists( '\Friends\User' ) ) {
				$user = \Friends\User::get_user_by_id( $user_id );
				if ( $user ) {
					foreach ( $user->get_feeds() as $feed ) {
						if ( $feed->get_parser() !== 'activitypub' ) {
							continue;
						}

						if ( $feed->is_active() ) {
							$relationship['following'] = true;
						}
					}

					if ( $user->has_cap( 'friend_request' ) ) {
						$relationship['requested'] = true;
					}
				}
			} elseif ( preg_match( '/^@?' . self::ACTIVITYPUB_USERNAME_REGEXP . '$/i', $user_id ) ) {
				$relationship['following'] = false;
			}
			$relationships[] = $relationship;
		}

		return $relationships;
	}

	public function api_notification_clear( $request ) {
		$notification_dismissed_tag = apply_filters( 'mastodon_api_notification_dismissed_tag', 'notification-dismissed' );
		$notifications = $this->api_notifications( $request );
		foreach ( $notifications as $notification ) {
			if ( $notification['status'] ) {
				wp_set_object_terms( $notification['status']['id'], $notification_dismissed_tag, 'post_tag', true );
			}
		}

		return (object) array();
	}

	public function api_notification_dismiss( $request ) {
		$notification_dismissed_tag = apply_filters( 'mastodon_api_notification_dismissed_tag', 'notification-dismissed' );
		$notifications = $this->api_notifications( $request );
		foreach ( $notifications as $notification ) {
			if ( $request->get_param( 'id' ) !== $notification['id'] ) {
				continue;
			}
			if ( $notification['status'] ) {
				wp_set_object_terms( $notification['status']['id'], $notification_dismissed_tag, 'post_tag', true );
				return (object) array();
			}
		}
		return (object) array();
	}

	public function api_notification_get( $request ) {
		$notifications = $this->api_notifications( $request );
		foreach ( $notifications as $notification ) {
			if ( $request->get_param( 'id' ) !== $notification['id'] ) {
				continue;
			}
			return $notification;
		}

		return (object) array();
	}

	public function api_notifications( $request ) {
		$limit = $request->get_param( 'limit' ) ? $request->get_param( 'limit' ) : 15;
		$notifications = array();
		$types = $request->get_param( 'types' );
		$args = array(
			'posts_per_page' => $limit + 2,
		);
		$exclude_types = $request->get_param( 'exclude_types' );
		if ( ( ! is_array( $types ) || in_array( 'mention', $types, true ) ) && ( ! is_array( $exclude_types ) || ! in_array( 'mention', $exclude_types, true ) ) ) {
			$external_user = apply_filters( 'mastodon_api_external_mentions_user', null );
			if ( ! $external_user || ! ( $external_user instanceof \WP_User ) ) {
				return array();
			}
			$args = $this->get_posts_query_args( $request );
			$args['posts_per_page'] = $limit + 2;
			$args['author'] = $external_user->ID;
			if ( class_exists( '\Friends\User' ) ) {
				if (
					$external_user instanceof \Friends\User
					&& method_exists( $external_user, 'modify_get_posts_args_by_author' )
				) {
					$args = $external_user->modify_get_posts_args_by_author( $args );
				}
			}

			$notification_dismissed_tag = get_term_by( 'slug', apply_filters( 'mastodon_api_notification_dismissed_tag', 'notification-dismissed' ), 'post_tag' );
			if ( $notification_dismissed_tag ) {
				$args['tag__not_in'] = array( $notification_dismissed_tag->term_id );
			}
			foreach ( get_posts( $args ) as $post ) {
				$meta = get_post_meta( $post->ID, 'activitypub', true );
				if ( ! $meta ) {
					continue;
				}
				$user_id = $post->post_author;
				if ( class_exists( '\Friends\User' ) && $post instanceof \WP_Post ) {
					$user = \Friends\User::get_post_author( $post );
					$user_id = $user->ID;
				}
				$notifications[] = $this->get_notification_array( 'mention', mysql2date( 'Y-m-d\TH:i:s.000P', $post->post_date, false ), $this->get_friend_account_data( $user_id, $meta ), $this->get_status_array( $post ) );
			}
		}

		$min_id   = $request->get_param( 'min_id' );
		$max_id   = $request->get_param( 'max_id' );
		$since_id = $request->get_param( 'since_id' );
		$next_min_id = false;

		$last_modified = $request->get_header( 'if-modified-since' );
		if ( $last_modified ) {
			$last_modified = gmdate( 'Y-m-d\TH:i:s.000P', strtotime( $last_modified ) );
			if ( $last_modified > $max_id ) {
				$max_id = $last_modified;
			}
		}

		$ret = array();
		$c = $limit;
		foreach ( $notifications as $notification ) {
			if ( $max_id ) {
				if ( strval( $notification['id'] ) >= strval( $max_id ) ) {
					continue;
				}
				$max_id = null;
			}
			if ( false === $next_min_id ) {
				$next_min_id = $notification['id'];
			}
			if ( $min_id && strval( $min_id ) >= strval( $notification['id'] ) ) {
				break;
			}
			if ( $since_id && strval( $since_id ) > strval( $notification['id'] ) ) {
				break;
			}
			if ( $c-- <= 0 ) {
				break;
			}
			$ret[] = $notification;
		}

		if ( ! empty( $ret ) ) {
			if ( $next_min_id ) {
				header( 'Link: <' . add_query_arg( 'min_id', $next_min_id, home_url( '/api/v1/notifications' ) ) . '>; rel="prev"', false );
			}
			header( 'Link: <' . add_query_arg( 'max_id', $ret[ count( $ret ) - 1 ]['id'], home_url( '/api/v1/notifications' ) ) . '>; rel="next"', false );
		}
		return $ret;
	}

	public function api_preferences( $request ) {
		$preferences = array(
			'posting:default:language'   => self::get_mastodon_language( get_user_locale() ),
			'posting:default:visibility' => apply_filters( 'mastodon_api_account_visibility', 'public', wp_get_current_user() ),
		);
		return $preferences;
	}

	public function api_account( $request ) {
		$user_id = $this->get_user_id_from_request( $request );
		return $this->get_friend_account_data( $user_id, array(), true );
	}

	/**
	 * Check whether this is a valid URL
	 *
	 * @param string $url The URL to check.
	 * @return false|string URL or false on failure.
	 */
	public static function check_url( $url ) {
		$host = parse_url( $url, PHP_URL_HOST );

		$check_url = apply_filters( 'friends_host_is_valid', null, $host );
		if ( ! is_null( $check_url ) ) {
			return $check_url;
		}

		return wp_http_validate_url( $url );
	}

	public function get_json( $url, $transient_key, $fallback = null, $force_retrieval = false ) {
		$expiry_key = $transient_key . '_expiry';
		$transient_expiry = \get_transient( $expiry_key );
		$response = \get_transient( $transient_key );
		if ( $transient_expiry < time() ) {
			// Re-retrieve it later.
			wp_schedule_single_event( time(), 'enable_mastodon_apps_get_json', array( $url, $transient_key, $fallback, true ) );
		}
		if ( $response && ! $force_retrieval ) {
			if ( is_wp_error( $response ) ) {
				if ( $fallback && 'http_request_failed' !== $response->get_error_code() ) {
					return $fallback;
				}
			} else {
				return $response;
			}
		}

		$response = \wp_remote_get(
			$url,
			array(
				'headers'     => array( 'Accept' => 'application/activity+json' ),
				'redirection' => 2,
				'timeout'     => 5,
			)
		);

		if ( \is_wp_error( $response ) ) {
			\set_transient( $transient_key, $response, HOUR_IN_SECONDS ); // Cache the error for a shorter period.
			if ( $fallback ) {
				return $fallback;
			}
			return $response;
		}

		if ( \is_wp_error( $response ) ) {
			\set_transient( $transient_key, $response, HOUR_IN_SECONDS ); // Cache the error for a shorter period.
			if ( $fallback ) {
				return $fallback;
			}
			return $response;
		}

		$body = \wp_remote_retrieve_body( $response );
		$body = \json_decode( $body, true );

		\set_transient( $transient_key, $body, YEAR_IN_SECONDS );
		\set_transient( $expiry_key, time() + HOUR_IN_SECONDS );

		return $body;
	}

	private function update_account_data_with_meta( $data, $meta, $full_metadata = false ) {
		if ( ! $meta || is_wp_error( $meta ) || isset( $meta['error'] ) ) {
			if ( empty( $data['username'] ) || ! $data['username'] ) {
				$data['username'] = strtok( $data['id'], '@' );
			}
			if ( empty( $data['display_name'] ) || ! $data['display_name'] ) {
				$data['display_name'] = $data['username'];
			}

			if ( empty( $data['created_at'] ) || ! $data['created_at'] ) {
				$data['created_at'] = '1970-01-01T00:00:00Z';
			}
			if ( ! $data['last_status_at'] ) {
				$data['last_status_at'] = $data['created_at'];
			}

			return $data;
		}
		if ( $full_metadata ) {
			$followers = $this->get_json( $meta['followers'], 'followers-' . $data['acct'], array( 'totalItems' => 0 ) );
			$following = $this->get_json( $meta['following'], 'following-' . $data['acct'], array( 'totalItems' => 0 ) );
			$outbox = $this->get_json( $meta['outbox'], 'outbox-' . $data['acct'], array( 'totalItems' => 0 ) );
			$data['followers_count'] = intval( $followers['totalItems'] );
			$data['following_count'] = intval( $following['totalItems'] );
			$data['statuses_count'] = intval( $outbox['totalItems'] );
		}

		if ( empty( $data['username'] ) || ! $data['username'] ) {
			if ( isset( $meta['preferredUsername'] ) && $meta['preferredUsername'] ) {
				$data['username'] = $meta['preferredUsername'];
			} else {
				$data['username'] = strtok( $data['id'], '@' );
			}
		}
		if ( empty( $data['display_name'] ) || ! $data['display_name'] ) {
			if ( isset( $meta['name'] ) && $meta['name'] ) {
				$data['display_name'] = $meta['name'];
			} else {
				$data['display_name'] = $data['username'];
			}
		}
		if ( ! empty( $meta['summary'] ) ) {
			$data['note'] = (string) $meta['summary'];
		}
		if ( empty( $data['created_at'] ) || ! $data['created_at'] ) {
			if ( isset( $meta['published'] ) && $meta['published'] ) {
				$data['created_at'] = $meta['published'];
			} else {
				$data['created_at'] = '1970-01-01T00:00:00Z';
			}
		}
		if ( ! $data['last_status_at'] ) {
			$data['last_status_at'] = $data['created_at'];
		}
		$data['url'] = $meta['url'];
		if ( isset( $meta['icon'] ) ) {
			$data['avatar'] = $meta['icon']['url'];
			$data['avatar_static'] = $meta['icon']['url'];
		}
		if ( isset( $meta['image'] ) ) {
			$data['header'] = $meta['image']['url'];
			$data['header_static'] = $meta['image']['url'];
		}
		if ( isset( $meta['discoverable'] ) ) {
			$data['discoverable'] = $meta['discoverable'];
		}
		return $data;
	}

	private function get_friend_account_data( $user_id, $meta = array(), $full_metadata = false ) {
		$external_user = apply_filters( 'mastodon_api_external_mentions_user', null );
		$is_external_mention = $external_user && strval( $external_user->ID ) === strval( $user_id );
		if ( $is_external_mention && isset( $meta['attributedTo']['id'] ) ) {
			$user_id = $meta['attributedTo']['id'];
		}

		$cache_key = 'account-' . $user_id;

		$url = false;
		if (
			preg_match( '#^https?://[^/]+/@[a-z0-9-]+$#i', $user_id )
			|| preg_match( '#^https?://[^/]+/(users|author)/[a-z0-9-]+$#i', $user_id )
		) {
			$url = $user_id;
		}

		if (
			preg_match( '/^@?' . self::ACTIVITYPUB_USERNAME_REGEXP . '$/i', $user_id )
			|| $url
		) {
			$account = $this->get_acct( $user_id );

			if ( $account ) {
				$remote_user_id = get_term_by( 'name', $account, self::REMOTE_USER_TAXONOMY );
				if ( $remote_user_id ) {
					$remote_user_id = $remote_user_id->term_id;
				} else {
					$remote_user_id = wp_insert_term( $account, self::REMOTE_USER_TAXONOMY );
					if ( ! is_wp_error( $remote_user_id ) ) {
						$remote_user_id = $remote_user_id['term_id'];
					}
				}
			} elseif ( $user_id ) {
				$remote_user_id = get_term_by( 'name', $user_id, self::REMOTE_USER_TAXONOMY );
				if ( $remote_user_id ) {
					$remote_user_id = $remote_user_id->term_id;
				} else {
					$remote_user_id = wp_insert_term( $user_id, self::REMOTE_USER_TAXONOMY );
					if ( ! is_wp_error( $remote_user_id ) ) {
						$remote_user_id = $remote_user_id['term_id'];
					}
				}
			}

			if ( $remote_user_id ) {
				$cache_key = 'account-' . ( 1e10 + $remote_user_id );
			}
		}

		$ret = wp_cache_get( $cache_key, 'enable-mastodon-apps' );
		if ( false !== $ret ) {
			return $ret;
		}

		// Data URL of an 1x1px transparent png.
		$placeholder_image = 'https://files.mastodon.social/media_attachments/files/003/134/405/original/04060b07ddf7bb0b.png';
		// $placeholder_image = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=';

		if (
			preg_match( '/^@?' . self::ACTIVITYPUB_USERNAME_REGEXP . '$/i', $user_id )
			|| $url
		) {
			if ( ! $remote_user_id ) {
				return null;
			}

			if ( ! $url ) {
				if ( isset( $meta['attributedTo']['id'] ) ) {
					$url = $meta['attributedTo']['id'];
					$user_id = $meta['attributedTo']['id'];
				} else {
					$url = $this->get_activitypub_url( $user_id );
				}
			}
			if ( ! $url ) {
				$data = new \WP_Error( 'user-not-found', 'User not found.', array( 'status' => 404 ) );
				wp_cache_set( $cache_key, $data, 'enable-mastodon-apps' );
				return $data;
			}
			$meta = apply_filters( 'friends_get_activitypub_metadata', array(), $url );

			$data = array(
				'id'              => strval( 1e10 + $remote_user_id ),
				'username'        => '',
				'acct'            => $account,
				'display_name'    => '',
				'locked'          => false,
				'bot'             => false,
				'discoverable'    => true,
				'group'           => false,
				'created_at'      => gmdate( 'Y-m-d\TH:i:s.000P' ),
				'note'            => '',
				'url'             => '',
				'avatar'          => $placeholder_image,
				'avatar_static'   => $placeholder_image,
				'header'          => $placeholder_image,
				'header_static'   => $placeholder_image,
				'followers_count' => 0,
				'following_count' => 0,
				'statuses_count'  => 0,
				'last_status_at'  => gmdate( 'Y-m-d' ),
				'emojis'          => array(),
				'fields'          => array(),
			);

			$data = $this->update_account_data_with_meta( $data, $meta, $full_metadata );

			wp_cache_set( $cache_key, $data, 'enable-mastodon-apps' );

			return $data;
		}

		$user = false;
		if ( class_exists( '\Friends\User' ) ) {
			$user = \Friends\User::get_user_by_id( $user_id );

			if ( $user instanceof \Friends\Subscription ) {
				$remote_user_id = get_term_by( 'name', $user->ID, self::REMOTE_USER_TAXONOMY );
				if ( $remote_user_id ) {
					$remote_user_id = $remote_user_id->term_id;
				} else {
					$remote_user_id = wp_insert_term( $user->ID, self::REMOTE_USER_TAXONOMY );
					if ( ! is_wp_error( $remote_user_id ) ) {
						$remote_user_id = $remote_user_id['term_id'];
					}
				}
				$user->ID = 1e10 + $remote_user_id;
			}
		}

		if ( ! $user || is_wp_error( $user ) ) {
			$user = new \WP_User( $user_id );
			if ( ! $user || is_wp_error( $user ) ) {
				$data = new \WP_Error( 'user-not-found', 'User not found.', array( 'status' => 404 ) );
				wp_cache_set( $cache_key, $data, 'enable-mastodon-apps' );
				return $data;
			}
		}
		$followers_count = 0;
		$following_count = 0;
		$avatar = get_avatar_url( $user->ID );
		if ( $user instanceof \Friends\User ) {
			$posts = $user->get_post_count_by_post_format();
		} else {
			// Get post count for the post format status for the user.
			$posts = array(
				'status' => count_user_posts( $user->ID, 'post', true ),
			);
		}
		if ( get_current_user_id() === $user->ID ) {
			if ( class_exists( '\Activitypub\Peer\Followers' ) ) {
				$followers_count = count( \Activitypub\Peer\Followers::get_followers( $user->ID ) );
			}
		}

		$data = array(
			'id'              => strval( $user->ID ),
			'username'        => $user->user_login,
			'display_name'    => $user->display_name,
			'avatar'          => $avatar,
			'avatar_static'   => $avatar,
			'header'          => $placeholder_image,
			'header_static'   => $placeholder_image,
			'acct'            => $user->user_login,
			'note'            => '',
			'created_at'      => mysql2date( 'Y-m-d\TH:i:s.000P', $user->user_registered, false ),
			'followers_count' => $followers_count,
			'following_count' => $following_count,
			'statuses_count'  => isset( $posts['status'] ) ? intval( $posts['status'] ) : 0,
			'last_status_at'  => mysql2date( 'Y-m-d\TH:i:s.000P', $user->user_registered, false ),
			'fields'          => array(),
			'locked'          => false,
			'emojis'          => array(),
			'url'             => get_author_posts_url( $user->ID ),
			'source'          => array(
				'privacy'   => apply_filters( 'mastodon_api_account_visibility', 'public', $user ),
				'sensitive' => false,
				'language'  => self::get_mastodon_language( get_user_locale( $user->ID ) ),
				'note'      => '',
				'fields'    => array(),
			),
			'bot'             => false,
			'discoverable'    => true,
		);

		if ( isset( $meta['attributedTo']['id'] ) && $is_external_mention ) {
			$data['acct'] = $this->get_acct( $meta['attributedTo']['id'] );
			$data['id'] = $data['acct'];
			$data['username'] = strtok( $data['acct'], '@' );

			$meta = apply_filters( 'friends_get_activitypub_metadata', array(), $meta['attributedTo']['id'] );
			$data = $this->update_account_data_with_meta( $data, $meta, $full_metadata );
		} else {
			$acct = $this->get_user_acct( $user );
			if ( $acct ) {
				$data['acct'] = $acct;
			}

			foreach ( apply_filters( 'friends_get_user_feeds', array(), $user ) as $feed ) {
				$meta = apply_filters( 'friends_get_feed_metadata', array(), $feed );
				if ( $meta && ! is_wp_error( $meta ) && ! isset( $meta['error'] ) ) {
					$data['acct'] = $this->get_acct( $meta['id'] );
					$data = $this->update_account_data_with_meta( $data, $meta, $full_metadata );
					break;
				}
			}
		}

		wp_cache_set( $cache_key, $data, 'enable-mastodon-apps' );
		return $data;
	}

	public static function get_mastodon_language( $lang ) {
		if ( false === strpos( $lang, '_' ) ) {
			return $lang . '_' . strtoupper( $lang );
		}
		return $lang;
	}

	public function get_user_acct( $user ) {
		return strtok( $this->get_acct( get_author_posts_url( $user->ID ) ), '@' );
	}

	public function get_acct( $id_or_url ) {
		if ( is_wp_error( $id_or_url ) ) {
			return '';
		}
		$webfinger = $this->webfinger( $id_or_url );
		if ( is_wp_error( $webfinger ) || ! isset( $webfinger['subject'] ) ) {
			return '';
		}
		if ( substr( $webfinger['subject'], 0, 5 ) === 'acct:' ) {
			return substr( $webfinger['subject'], 5 );
		}
		return $webfinger['subject'];
	}

	public function get_activitypub_url( $id_or_url ) {
		$webfinger = $this->webfinger( $id_or_url );
		if ( is_wp_error( $webfinger ) || empty( $webfinger['links'] ) ) {
			return false;
		}
		foreach ( $webfinger['links'] as $link ) {
			if ( ! isset( $link['rel'] ) ) {
				continue;
			}
			if ( 'self' === $link['rel'] && 'application/activity+json' === $link['type'] && in_array( $link['href'], $webfinger['aliases'] ) ) {
				return $link['href'];
			}
		}

		if ( ! empty( $webfinger['aliases'] ) ) {
			return $webfinger['aliases'][0];
		}

		return false;
	}

	private function webfinger( $id_or_url ) {
		if ( strpos( $id_or_url, 'acct:' ) === 0 ) {
			$id_or_url = substr( $id_or_url, 5 );
		}

		$body = apply_filters( 'mastodon_api_webfinger', null, $id_or_url );
		if ( $body ) {
			return $body;
		}

		$id = $id_or_url;
		if ( preg_match( '#^https://([^/]+)/(?:@|users/|author/)([^/]+)/?$#', $id_or_url, $m ) ) {
			$id = $m[2] . '@' . $m[1];
			$host = $m[1];
		} elseif ( false !== strpos( $id_or_url, '@' ) ) {
			$parts = explode( '@', ltrim( $id_or_url, '@' ) );
			$host = $parts[1];
		} else {
			return null;
		}

		$transient_key = 'mastodon_api_webfinger_' . md5( $id_or_url );

		$body = \get_transient( $transient_key );
		if ( $body ) {
			if ( is_wp_error( $body ) ) {
				return $id;
			}
			return $body;
		}

		$url = \add_query_arg( 'resource', 'acct:' . ltrim( $id, '@' ), 'https://' . $host . '/.well-known/webfinger' );
		if ( ! self::check_url( $url ) ) {
			$response = new \WP_Error( 'invalid_webfinger_url', null, $url );
			\set_transient( $transient_key, $response, HOUR_IN_SECONDS ); // Cache the error for a shorter period.
			return $response;
		}

		$body = $this->get_json( $url, $transient_key );

		if ( \is_wp_error( $body ) ) {
			$body = new \WP_Error( 'webfinger_url_not_accessible', null, $url );
			\set_transient( $transient_key, $body, HOUR_IN_SECONDS ); // Cache the error for a shorter period.
			return $body;
		}

		\set_transient( $transient_key, $body, WEEK_IN_SECONDS );
		return $body;
	}

	private function remap_reblog_id( $post_id ) {
		$remapped_post_id = get_post_meta( $post_id, 'mastodon_reblog_id', true );
		if ( ! $remapped_post_id ) {
			$remapped_post_id = wp_insert_post(
				array(
					'post_type'   => self::CPT,
					'post_author' => 0,
					'post_status' => 'publish',
					'post_title'  => 'Reblog of ' . $post_id,
					'meta_input'  => array(
						'mastodon_reblog_id' => $post_id,
					),
				)
			);

			update_post_meta( $post_id, 'mastodon_reblog_id', $remapped_post_id );
		}
		return $remapped_post_id;
	}

	private function maybe_get_remapped_reblog_id( $remapped_post_id ) {
		$post_id = get_post_meta( $remapped_post_id, 'mastodon_reblog_id', true );
		if ( $post_id ) {
			return $post_id;
		}
		return $remapped_post_id;
	}

	private function remap_comment_id( $comment_id ) {
		$remapped_comment_id = get_comment_meta( $comment_id, 'mastodon_comment_id', true );
		if ( ! $remapped_comment_id ) {
			$remapped_comment_id = wp_insert_post(
				array(
					'post_type'   => self::CPT,
					'post_author' => 0,
					'post_status' => 'publish',
					'post_title'  => 'Comment ' . $comment_id,
					'meta_input'  => array(
						'mastodon_comment_id' => $comment_id,
					),
				)
			);

			update_comment_meta( $comment_id, 'mastodon_comment_id', $remapped_comment_id );
		}
		return $remapped_comment_id;
	}

	private function get_remapped_comment_id( $remapped_comment_id ) {
		$comment_id = get_post_meta( $remapped_comment_id, 'mastodon_comment_id', true );
		if ( $comment_id ) {
			return $comment_id;
		}
		return false;
	}

	private function software_string() {
		global $wp_version;
		$software = 'WordPress/' . $wp_version;
		if ( defined( 'FRIENDS_VERSION' ) ) {
			$software .= ', Friends/' . FRIENDS_VERSION;
		}
		if ( defined( 'ACTIVITYPUB_VERSION' ) ) {
			$software .= ', ActivityPub/' . ACTIVITYPUB_VERSION;
		}
		$software .= ', EMA/' . self::VERSION;
		return $software;
	}

	public function api_nodeinfo() {
		global $wp_version;
		$software = array(
			'name'    => $this->software_string(),
			'version' => Mastodon_API::VERSION,
		);
		$software = apply_filters( 'mastodon_api_nodeinfo_software', $software );
		$ret = array(
			'metadata'          => array(
				'nodeName'        => html_entity_decode( get_bloginfo( 'name' ), ENT_QUOTES ),
				'nodeDescription' => html_entity_decode( get_bloginfo( 'description' ), ENT_QUOTES ),
				'software'        => $software,
				'config'          => array(
					'features' => array(
						'timelines'   => array(
							'local'   => true,
							'network' => true,
						),
						'mobile_apis' => true,
						'stories'     => false,
						'video'       => false,
						'import'      => array(
							'instagram' => false,
							'mastodon'  => false,
							'pixelfed'  => false,
						),
					),
				),
			),
			'version'           => '2.0',
			'protocols'         => array(
				'activitpypub',
			),
			'services'          => array(
				'inbound'  => array(),
				'outbound' => array(),
			),

			'software'          => $software,
			'openRegistrations' => false,
		);

		return apply_filters( 'mastodon_api_nodeinfo', $ret );
	}

	public function api_announcements() {
		$ret = array();

		$content   = array();
		$content[] = sprintf(
			// Translators: %1$s is a URL, %2$s is the domain of your blog.
			__( 'Using this Mastodon app is made possible by the <a href=%1$s>Enable Mastodon Apps WordPress plugin</a> on %2$s.', 'enable-mastodon-apps' ),
			'"https://wordpress.org/plugins/enable-mastodon-apps"',
			'<a href="' . home_url() . '">' . get_bloginfo( 'name' ) . '</a>'
		);

		$content[] = sprintf(
			// Translators: %s is the post formats.
			_n( 'Posts with the post format <strong>%s</strong> will appear in this app.', 'Posts with the post formats <strong>%s</strong> will appear in this app.', count( $this->app->get_post_formats() ), 'enable-mastodon-apps' ),
			implode( ', ', $this->app->get_post_formats() )
		);

		$content[] = sprintf(
			// Translators: %s is the post format.
			__( 'If you create a new note in this app, it will be created with the <strong>%s</strong> post format.', 'enable-mastodon-apps' ),
			reset( $this->app->get_post_formats() )
		);

		if ( 'standard' === reset( $this->app->get_post_formats() ) ) {
			$content[] = __( 'If you want to create a post in WordPress with a title, add a new line after the title. The first line will then appear as the title of the post.', 'enable-mastodon-apps' );
		} else {
			$content[] = __( 'Because a new post is not created in the standard post format, it will be published without title. To change this, select the <strong>standard</strong> post format in the Enable Mastodon Apps settings.', 'enable-mastodon-apps' );
		}

		$ret[] = array(
			'id'           => 1,
			'content'      => '<h1><strong>' . __( 'Mastodon Apps', 'enable-mastodon-apps' ) . '</strong></h1><p>' . implode( '</p><p>' . PHP_EOL, $content ) . '</p>',
			'published_at' => $this->app->get_creation_date(),
			'updated_at'   => time(),
			'starts_at'    => null,
			'ends_at'      => null,
			'all_day'      => false,
			'read'         => true,
			'mentions'     => array(),
			'statuses'     => array(),
			'tags'         => array(),
			'emojis'       => array(),
			'reactions'    => array(),

		);

		return $ret;
	}

	public function api_instance() {
		$ret = array(
			'title'             => html_entity_decode( get_bloginfo( 'name' ), ENT_QUOTES ),
			'description'       => html_entity_decode( get_bloginfo( 'description' ), ENT_QUOTES ),
			'short_description' => html_entity_decode( get_bloginfo( 'description' ), ENT_QUOTES ),
			'email'             => 'not@public.example',
			'version'           => $this->software_string(),
			'stats'             => array(
				'user_count'   => 1,
				'status_count' => 1,
				'domain_count' => 1,
			),

			'account_domain'    => \wp_parse_url( \home_url(), \PHP_URL_HOST ),
			'registrations'     => false,
			'approval_required' => false,
			'uri'               => home_url(),
		);

		return apply_filters( 'mastodon_api_instance_v1', $ret );
	}

	public function api_instance_v2() {
		$api_instance = $this->api_instance();
		$ret = array_merge(
			array(
				'domain' => $api_instance['account_domain'],
			),
			$api_instance
		);

		unset( $ret['account_domain'] );

		return apply_filters( 'mastodon_api_instance_v2', $ret );
	}
}