<?php
/**
 * WP_oEmbed_Controller class, used to provide an oEmbed endpoint.
 *
 * @package WordPress
 * @subpackage Embeds
 * @since 4.4.0
 */

/**
 * oEmbed API endpoint controller.
 *
 * Registers the API route and delivers the response data.
 * The output format (XML or JSON) is handled by the REST API.
 *
 * @since 4.4.0
 */
final class WP_oEmbed_Controller {
	/**
	 * Register the oEmbed REST API route.
	 *
	 * @since 4.4.0
	 * @access public
	 */
	public function register_routes() {
		/**
		 * Filters the maxwidth oEmbed parameter.
		 *
		 * @since 4.4.0
		 *
		 * @param int $maxwidth Maximum allowed width. Default 600.
		 */
		$maxwidth = apply_filters( 'oembed_default_width', 600 );

		register_rest_route( 'oembed/1.0', '/embed', array(
			array(
				'methods'  => WP_REST_Server::READABLE,
				'callback' => array( $this, 'get_item' ),
				'args'     => array(
					'url'      => array(
						'required'          => true,
						'sanitize_callback' => 'esc_url_raw',
					),
					'format'   => array(
						'default'           => 'json',
						'sanitize_callback' => 'wp_oembed_ensure_format',
					),
					'maxwidth' => array(
						'default'           => $maxwidth,
						'sanitize_callback' => 'absint',
					),
				),
			),
		) );

		register_rest_route( 'oembed/1.0', '/proxy', array(
			array(
				'methods'  => WP_REST_Server::READABLE,
				'callback' => array( $this, 'get_proxy_item' ),
				'permission_callback' => array( $this, 'get_proxy_item_permissions_check' ),
				'args'     => array(
					'url'      => array(
						'description'       => __( 'The URL of the resource for which to fetch oEmbed data.' ),
						'type'              => 'string',
						'required'          => true,
						'sanitize_callback' => 'esc_url_raw',
					),
					'format'   => array(
						'description'       => __( 'The oEmbed format to use.' ),
						'type'              => 'string',
						'default'           => 'json',
						'enum'              => array(
							'json',
							'xml',
						),
					),
					'maxwidth' => array(
						'description'       => __( 'The maximum width of the embed frame in pixels.' ),
						'type'              => 'integer',
						'default'           => $maxwidth,
						'sanitize_callback' => 'absint',
					),
					'maxheight' => array(
						'description'       => __( 'The maximum height of the embed frame in pixels.' ),
						'type'              => 'integer',
						'sanitize_callback' => 'absint',
					),
					'discover' => array(
						'description'       => __( 'Whether to perform an oEmbed discovery request for non-whitelisted providers.' ),
						'type'              => 'boolean',
						'default'           => true,
					),
				),
			),
		) );
	}

	/**
	 * Callback for the embed API endpoint.
	 *
	 * Returns the JSON object for the post.
	 *
	 * @since 4.4.0
	 * @access public
	 *
	 * @param WP_REST_Request $request Full data about the request.
	 * @return WP_Error|array oEmbed response data or WP_Error on failure.
	 */
	public function get_item( $request ) {
		$post_id = url_to_postid( $request['url'] );

		/**
		 * Filters the determined post ID.
		 *
		 * @since 4.4.0
		 *
		 * @param int    $post_id The post ID.
		 * @param string $url     The requested URL.
		 */
		$post_id = apply_filters( 'oembed_request_post_id', $post_id, $request['url'] );

		$data = get_oembed_response_data( $post_id, $request['maxwidth'] );

		if ( ! $data ) {
			return new WP_Error( 'oembed_invalid_url', get_status_header_desc( 404 ), array( 'status' => 404 ) );
		}

		return $data;
	}

	/**
	 * Checks if current user can make a proxy oEmbed request.
	 *
	 * @since 4.8.0
	 * @access public
	 *
	 * @return true|WP_Error True if the request has read access, WP_Error object otherwise.
	 */
	public function get_proxy_item_permissions_check() {
		if ( ! current_user_can( 'edit_posts' ) ) {
			return new WP_Error( 'rest_forbidden', __( 'Sorry, you are not allowed to make proxied oEmbed requests.' ), array( 'status' => rest_authorization_required_code() ) );
		}
		return true;
	}

	/**
	 * Callback for the proxy API endpoint.
	 *
	 * Returns the JSON object for the proxied item.
	 *
	 * @since 4.8.0
	 * @access public
	 *
	 * @see WP_oEmbed::get_html()
	 * @param WP_REST_Request $request Full data about the request.
	 * @return WP_Error|array oEmbed response data or WP_Error on failure.
	 */
	public function get_proxy_item( $request ) {
		$args = $request->get_params();

		// Serve oEmbed data from cache if set.
		$cache_key = 'oembed_' . md5( serialize( $args ) );
		$data = get_transient( $cache_key );
		if ( ! empty( $data ) ) {
			return $data;
		}

		$url = $request['url'];
		unset( $args['url'] );

		$data = _wp_oembed_get_object()->get_data( $url, $args );

		if ( false === $data ) {
			return new WP_Error( 'oembed_invalid_url', get_status_header_desc( 404 ), array( 'status' => 404 ) );
		}

		/**
		 * Filters the oEmbed TTL value (time to live).
		 *
		 * Similar to the {@see 'oembed_ttl'} filter, but for the REST API
		 * oEmbed proxy endpoint.
		 *
		 * @since 4.8.0
		 *
		 * @param int    $time    Time to live (in seconds).
		 * @param string $url     The attempted embed URL.
		 * @param array  $args    An array of embed request arguments.
		 */
		$ttl = apply_filters( 'rest_oembed_ttl', DAY_IN_SECONDS, $url, $args );

		set_transient( $cache_key, $data, $ttl );

		return $data;
	}
}
