/wp-content/plugins/jetpack/class.json-api.php

<?php



defined( 'WPCOM_JSON_API__DEBUG' ) or define( 'WPCOM_JSON_API__DEBUG', false );



class WPCOM_JSON_API {

	static $self = null;



	var $endpoints = array();



	var $token_details = array();



	var $method = '';

	var $url = '';

	var $path = '';

	var $version = null;

	var $query = array();

	var $post_body = null;

	var $files = null;

	var $content_type = null;

	var $accept = '';



	var $_server_https;

	var $exit = true;

	var $public_api_scheme = 'https';



	var $output_status_code = 200;



	var $trapped_error = null;

	var $did_output = false;



	static function init( $method = null, $url = null, $post_body = null ) {

		if ( !self::$self ) {

			$class = function_exists( 'get_called_class' ) ? get_called_class() : __CLASS__;

			self::$self = new $class( $method, $url, $post_body );

		}

		return self::$self;

	}



	function add( WPCOM_JSON_API_Endpoint $endpoint ) {

		$path_versions = serialize( array (

			$endpoint->path,

			$endpoint->min_version,

			$endpoint->max_version,

		) );

		if ( !isset( $this->endpoints[$path_versions] ) ) {

			$this->endpoints[$path_versions] = array();

		}

		$this->endpoints[$path_versions][$endpoint->method] = $endpoint;

	}



	static function is_truthy( $value ) {

		switch ( strtolower( (string) $value ) ) {

		case '1' :

		case 't' :

		case 'true' :

			return true;

		}



		return false;

	}



	static function is_falsy( $value ) {

		switch ( strtolower( (string) $value ) ) {

			case '0' :

			case 'f' :

			case 'false' :

				return true;

		}



		return false;

	}



	function __construct() {

		$args = func_get_args();

		call_user_func_array( array( $this, 'setup_inputs' ), $args );

	}



	function setup_inputs( $method = null, $url = null, $post_body = null ) {

		if ( is_null( $method ) ) {

			$this->method = strtoupper( $_SERVER['REQUEST_METHOD'] );

		} else {

			$this->method = strtoupper( $method );

		}

		if ( is_null( $url ) ) {

			$this->url = set_url_scheme( 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );

		} else {

			$this->url = $url;

		}



		$parsed     = parse_url( $this->url );

		$this->path = $parsed['path'];



		if ( !empty( $parsed['query'] ) ) {

			wp_parse_str( $parsed['query'], $this->query );

		}



		if ( isset( $_SERVER['HTTP_ACCEPT'] ) && $_SERVER['HTTP_ACCEPT'] ) {

			$this->accept = $_SERVER['HTTP_ACCEPT'];

		}



		if ( 'POST' === $this->method ) {

			if ( is_null( $post_body ) ) {

				$this->post_body = file_get_contents( 'php://input' );



				if ( isset( $_SERVER['HTTP_CONTENT_TYPE'] ) && $_SERVER['HTTP_CONTENT_TYPE'] ) {

					$this->content_type = $_SERVER['HTTP_CONTENT_TYPE'];

				} elseif ( isset( $_SERVER['CONTENT_TYPE'] ) && $_SERVER['CONTENT_TYPE'] ) {

					$this->content_type = $_SERVER['CONTENT_TYPE'] ;

				} elseif ( '{' === $this->post_body[0] ) {

					$this->content_type = 'application/json';

				} else {

					$this->content_type = 'application/x-www-form-urlencoded';

				}



				if ( 0 === strpos( strtolower( $this->content_type ), 'multipart/' ) ) {

					$this->post_body = http_build_query( stripslashes_deep( $_POST ) );

					$this->files = $_FILES;

					$this->content_type = 'multipart/form-data';

				}

			} else {

				$this->post_body = $post_body;

				$this->content_type = '{' === isset( $this->post_body[0] ) && $this->post_body[0] ? 'application/json' : 'application/x-www-form-urlencoded';

			}

		} else {

			$this->post_body = null;

			$this->content_type = null;

		}



		$this->_server_https = array_key_exists( 'HTTPS', $_SERVER ) ? $_SERVER['HTTPS'] : '--UNset--';

	}



	function initialize() {

		$this->token_details['blog_id'] = Jetpack_Options::get_option( 'id' );

	}



	function serve( $exit = true ) {

		ini_set( 'display_errors', false );



		$this->exit = (bool) $exit;



		add_filter( 'home_url', array( $this, 'ensure_http_scheme_of_home_url' ), 10, 3 );



		add_filter( 'user_can_richedit', '__return_true' );



		add_filter( 'comment_edit_pre', array( $this, 'comment_edit_pre' ) );



		$initialization = $this->initialize();

		if ( 'OPTIONS' == $this->method ) {

			do_action( 'wpcom_json_api_options' );

			return $this->output( 200, '', 'plain/text' );

		}



		if ( is_wp_error( $initialization ) ) {

			$this->output_error( $initialization );

			return;

		}



		// Normalize path and extract API version

		$this->path = untrailingslashit( $this->path );

		preg_match( '#^/rest/v(\d+(\.\d+)*)#', $this->path, $matches );

		$this->path = substr( $this->path, strlen( $matches[0] ) );

		$this->version = $matches[1];



		$allowed_methods = array( 'GET', 'POST' );

		$four_oh_five = false;



		$is_help = preg_match( '#/help/?$#i', $this->path );

		$matching_endpoints = array();



		if ( $is_help ) {

			$origin = get_http_origin();



			if ( !empty( $origin ) && 'GET' == $this->method ) {

				header( 'Access-Control-Allow-Origin: ' . esc_url_raw( $origin ) );

			}

			

			$this->path = substr( rtrim( $this->path, '/' ), 0, -5 );

			// Show help for all matching endpoints regardless of method

			$methods = $allowed_methods;

			$find_all_matching_endpoints = true;

			// How deep to truncate each endpoint's path to see if it matches this help request

			$depth = substr_count( $this->path, '/' ) + 1;

			if ( false !== stripos( $this->accept, 'javascript' ) || false !== stripos( $this->accept, 'json' ) ) {

				$help_content_type = 'json';

			} else {

				$help_content_type = 'html';

			}

		} else {

			if ( in_array( $this->method, $allowed_methods ) ) {

				// Only serve requested method

				$methods = array( $this->method );

				$find_all_matching_endpoints = false;

			} else {

				// We don't allow this requested method - find matching endpoints and send 405

				$methods = $allowed_methods;

				$find_all_matching_endpoints = true;

				$four_oh_five = true;

			}

		}



		// Find which endpoint to serve

		$found = false;

		foreach ( $this->endpoints as $endpoint_path_versions => $endpoints_by_method ) {

			$endpoint_path_versions = unserialize( $endpoint_path_versions );

			$endpoint_path        = $endpoint_path_versions[0];

			$endpoint_min_version = $endpoint_path_versions[1];

			$endpoint_max_version = $endpoint_path_versions[2];

			foreach ( $methods as $method ) {

				if ( !isset( $endpoints_by_method[$method] ) ) {

					continue;

				}



				// Normalize

				$endpoint_path = untrailingslashit( $endpoint_path );

				if ( $is_help ) {

					// Truncate path at help depth

					$endpoint_path = join( '/', array_slice( explode( '/', $endpoint_path ), 0, $depth ) );

				}



				// Generate regular expression from sprintf()

				$endpoint_path_regex = str_replace( array( '%s', '%d' ), array( '([^/?&]+)', '(\d+)' ), $endpoint_path );



				if ( !preg_match( "#^$endpoint_path_regex\$#", $this->path, $path_pieces ) ) {

					// This endpoint does not match the requested path.

					continue;

				}



				if ( version_compare( $this->version, $endpoint_min_version, '<' ) || version_compare( $this->version, $endpoint_max_version, '>' ) ) {

					// This endpoint does not match the requested version.

					continue;

				}



				$found = true;



				if ( $find_all_matching_endpoints ) {

					$matching_endpoints[] = array( $endpoints_by_method[$method], $path_pieces );

				} else {

					// The method parameters are now in $path_pieces

					$endpoint = $endpoints_by_method[$method];

					break 2;

				}

			}

		}



		if ( !$found ) {

			return $this->output( 404, '', 'text/plain' );

		}



		if ( $four_oh_five ) {

			$allowed_methods = array();

			foreach ( $matching_endpoints as $matching_endpoint ) {

				$allowed_methods[] = $matching_endpoint[0]->method;

			}



			header( 'Allow: ' . strtoupper( join( ',', array_unique( $allowed_methods ) ) ) );

			return $this->output( 405, array( 'error' => 'not_allowed', 'error_message' => 'Method not allowed' ) );

		}



		if ( $is_help ) {

			do_action( 'wpcom_json_api_output', 'help' );

			if ( 'json' === $help_content_type ) {

				$docs = array();

				foreach ( $matching_endpoints as $matching_endpoint ) {

					if ( $matching_endpoint[0]->is_publicly_documentable() || WPCOM_JSON_API__DEBUG )

						$docs[] = call_user_func( array( $matching_endpoint[0], 'generate_documentation' ) );

				}

				return $this->output( 200, $docs );

			} else {

				status_header( 200 );

				foreach ( $matching_endpoints as $matching_endpoint ) {

					if ( $matching_endpoint[0]->is_publicly_documentable() || WPCOM_JSON_API__DEBUG )

						call_user_func( array( $matching_endpoint[0], 'document' ) );

				}

			}

			exit;

		}



		if ( $endpoint->in_testing && !WPCOM_JSON_API__DEBUG ) {

			return $this->output( 404, '', 'text/plain' );

		}



		do_action( 'wpcom_json_api_output', $endpoint->stat );



		$response = $this->process_request( $endpoint, $path_pieces );



		if ( !$response && !is_array( $response ) ) {

			return $this->output( 500, '', 'text/plain' );

		} elseif ( is_wp_error( $response ) ) {

			return $this->output_error( $response );

		}



		$output_status_code = $this->output_status_code;

		$this->set_output_status_code();



		return $this->output( $output_status_code, $response );

	}



	function process_request( WPCOM_JSON_API_Endpoint $endpoint, $path_pieces ) {

		$this->endpoint = $endpoint;

		return call_user_func_array( array( $endpoint, 'callback' ), $path_pieces );

	}



	function output_early( $status_code, $response = null, $content_type = 'application/json' ) {

		$exit = $this->exit;

		$this->exit = false;

		if ( is_wp_error( $response ) )

			$this->output_error( $response );

		else

			$this->output( $status_code, $response, $content_type );

		$this->exit = $exit;

		$this->finish_request();

	}



	function set_output_status_code( $code = 200 ) {

		$this->output_status_code = $code;

	}



	function output( $status_code, $response = null, $content_type = 'application/json' ) {

		// In case output() was called before the callback returned

		if ( $this->did_output ) {

			if ( $this->exit )

				exit;

			return $content_type;

		}

		$this->did_output = true;



		// 400s and 404s are allowed for all origins

		if ( 404 == $status_code || 400 == $status_code )

			header( 'Access-Control-Allow-Origin: *' );



		if ( is_null( $response ) ) {

			$response = new stdClass;

		}



		if ( 'text/plain' === $content_type ) {

			status_header( (int) $status_code );

			header( 'Content-Type: text/plain' );

			echo $response;

			if ( $this->exit ) {

				exit;

			}



			return $content_type;

		}



		$response = $this->filter_fields( $response );



		if ( isset( $this->query['http_envelope'] ) && self::is_truthy( $this->query['http_envelope'] ) ) {

			$response = array(

				'code' => (int) $status_code,

				'headers' => array(

					array(

						'name' => 'Content-Type',

						'value' => $content_type,

					),

				),

				'body' => $response,

			);

			$status_code = 200;

			$content_type = 'application/json';

		}



		status_header( (int) $status_code );

		header( "Content-Type: $content_type" );

		if ( isset( $this->query['callback'] ) && is_string( $this->query['callback'] ) ) {

			$callback = preg_replace( '/[^a-z0-9_.]/i', '', $this->query['callback'] );

		} else {

			$callback = false;

		}



		if ( $callback ) {

			// Mitigate Rosetta Flash [1] by setting the Content-Type-Options: nosniff header

			// and by prepending the JSONP response with a JS comment.

			// [1] http://miki.it/blog/2014/7/8/abusing-jsonp-with-rosetta-flash/

			echo "/**/$callback(";



		}

		echo $this->json_encode( $response );

		if ( $callback ) {

			echo ");";

		}



		if ( $this->exit ) {

			exit;

		}



		return $content_type;

	}



	public static function serializable_error ( $error ) {



		$status_code = $error->get_error_data();



		if ( is_array( $status_code ) )

			$status_code = $status_code['status_code'];



		if ( !$status_code ) {

			$status_code = 400;

		}

		$response = array(

			'error'   => $error->get_error_code(),

			'message' => $error->get_error_message(),

		);

		return array(

			'status_code' => $status_code,

			'errors' => $response

		);

	}



	function output_error( $error ) {

		if ( function_exists( 'bump_stats_extra' ) ) {

			$client_id = ! empty( $this->token_details['client_id'] ) ? $this->token_details['client_id'] : 0;

			bump_stats_extra( 'rest-api-errors', $client_id );

		}



		$error_response = $this->serializable_error( $error );



		return $this->output( $error_response[ 'status_code'], $error_response['errors'] );

	}



	function filter_fields( $response ) {

		if ( empty( $this->query['fields'] ) || ( is_array( $response ) && ! empty( $response['error'] ) ) || ! empty( $this->endpoint->custom_fields_filtering ) )

			return $response;



		$fields = array_map( 'trim', explode( ',', $this->query['fields'] ) );



		if ( is_object( $response ) ) {

			$response = (array) $response;

		}



		$has_filtered = false;

		if ( is_array( $response ) && empty( $response['ID'] ) ) {

			$keys_to_filter = array(

				'categories',

				'comments',

				'connections',

				'domains',

				'groups',

				'likes',

				'media',

				'notes',

				'posts',

				'services',

				'sites',

				'suggestions',

				'tags',

				'themes',

				'topics',

				'users',

			);



			foreach ( $keys_to_filter as $key_to_filter ) {

				if ( ! isset( $response[ $key_to_filter ] ) || $has_filtered )

					continue;



				foreach ( $response[ $key_to_filter ] as $key => $values ) {

					if ( is_object( $values ) ) {

						$response[ $key_to_filter ][ $key ] = (object) array_intersect_key( (array) $values, array_flip( $fields ) );

					} elseif ( is_array( $values ) ) {

						$response[ $key_to_filter ][ $key ] = array_intersect_key( $values, array_flip( $fields ) );

					}

				}



				$has_filtered = true;

			}

		}



		if ( ! $has_filtered ) {

			if ( is_object( $response ) ) {

				$response = (object) array_intersect_key( (array) $response, array_flip( $fields ) );

			} else if ( is_array( $response ) ) {

				$response = array_intersect_key( $response, array_flip( $fields ) );

			}

		}



		return $response;

	}



	function ensure_http_scheme_of_home_url( $url, $path, $original_scheme ) {

		if ( $original_scheme ) {

			return $url;

		}



		return preg_replace( '#^https:#', 'http:', $url );

	}



	function comment_edit_pre( $comment_content ) {

		return htmlspecialchars_decode( $comment_content, ENT_QUOTES );

	}



	function json_encode( $data ) {

		return json_encode( $data );

	}



	function ends_with( $haystack, $needle ) {

		return $needle === substr( $haystack, -strlen( $needle ) );

	}



	// Returns the site's blog_id in the WP.com ecosystem

	function get_blog_id_for_output() {

		return $this->token_details['blog_id'];

	}



	// Returns the site's local blog_id

	function get_blog_id( $blog_id ) {

		return $GLOBALS['blog_id'];

	}



	function switch_to_blog_and_validate_user( $blog_id = 0, $verify_token_for_blog = true ) {

		if ( $this->is_restricted_blog( $blog_id ) ) {

			return new WP_Error( 'unauthorized', 'User cannot access this restricted blog', 403 );

		}



		if ( -1 == get_option( 'blog_public' ) && !current_user_can( 'read' ) ) {

			return new WP_Error( 'unauthorized', 'User cannot access this private blog.', 403 );

		}



		return $blog_id;

	}



	// Returns true if the specified blog ID is a restricted blog

	function is_restricted_blog( $blog_id ) {

		$restricted_blog_ids = apply_filters( 'wpcom_json_api_restricted_blog_ids', array() );

		return true === in_array( $blog_id, $restricted_blog_ids );

	}



	function post_like_count( $blog_id, $post_id ) {

		return 0;

	}



	function is_liked( $blog_id, $post_id ) {

		return false;

	}



	function is_reblogged( $blog_id, $post_id ) {

		return false;

	}



	function is_following( $blog_id ) {

		return false;

	}



	function add_global_ID( $blog_id, $post_id ) {

		return '';

	}



	function get_avatar_url( $email, $avatar_size = 96 ) {

		add_filter( 'pre_option_show_avatars', '__return_true', 999 );

		$_SERVER['HTTPS'] = 'off';



		$avatar_img_element = get_avatar( $email, $avatar_size, '' );



		if ( !$avatar_img_element || is_wp_error( $avatar_img_element ) ) {

			$return = '';

		} elseif ( !preg_match( '#src=([\'"])?(.*?)(?(1)\\1|\s)#', $avatar_img_element, $matches ) ) {

			$return = '';

		} else {

			$return = esc_url_raw( htmlspecialchars_decode( $matches[2] ) );

		}



		remove_filter( 'pre_option_show_avatars', '__return_true', 999 );

		if ( '--UNset--' === $this->_server_https ) {

			unset( $_SERVER['HTTPS'] );

		} else {

			$_SERVER['HTTPS'] = $this->_server_https;

		}



		return $return;

	}



	/**

	 * Traps `wp_die()` calls and outputs a JSON response instead.

	 * The result is always output, never returned.

	 *

	 * @param string|null $error_code.  Call with string to start the trapping.  Call with null to stop.

	 */

	function trap_wp_die( $error_code = null ) {

		// Stop trapping

		if ( is_null( $error_code ) ) {

			$this->trapped_error = null;

			remove_filter( 'wp_die_handler', array( $this, 'wp_die_handler_callback' ) );

			return;

		}



		// If API called via PHP, bail: don't do our custom wp_die().  Do the normal wp_die().

		if ( defined( 'IS_WPCOM' ) && IS_WPCOM ) {

			if ( ! defined( 'REST_API_REQUEST' ) || ! REST_API_REQUEST ) {

				return;

			}

		} else {

			if ( ! defined( 'XMLRPC_REQUEST' ) || ! XMLRPC_REQUEST ) {

				return;

			}

		}



		// Start trapping

		$this->trapped_error = array(

			'status'  => 500,

			'code'    => $error_code,

			'message' => '',

		);



		add_filter( 'wp_die_handler', array( $this, 'wp_die_handler_callback' ) );

	}



	function wp_die_handler_callback() {

		return array( $this, 'wp_die_handler' );

	}



	function wp_die_handler( $message, $title = '', $args = array() ) {

		$args = wp_parse_args( $args, array(

			'response' => 500,

		) );



		if ( $title ) {

			$message = "$title: $message";

		}



		switch ( $this->trapped_error['code'] ) {

		case 'comment_failure' :

			if ( did_action( 'comment_duplicate_trigger' ) ) {

				$this->trapped_error['code'] = 'comment_duplicate';

			} else if ( did_action( 'comment_flood_trigger' ) ) {

				$this->trapped_error['code'] = 'comment_flood';

			}

			break;

		}



		$this->trapped_error['status']  = $args['response'];

		$this->trapped_error['message'] = wp_kses( $message, array() );



		// We still want to exit so that code execution stops where it should.

		// Attach the JSON output to WordPress' shutdown handler

		add_action( 'shutdown', array( $this, 'output_trapped_error' ), 0 );

		exit;

	}



	function output_trapped_error() {

		$this->exit = false; // We're already exiting once.  Don't do it twice.

		$this->output( $this->trapped_error['status'], (object) array(

			'error'   => $this->trapped_error['code'],

			'message' => $this->trapped_error['message'],

		) );

	}



	function finish_request() {

		if ( function_exists( 'fastcgi_finish_request' ) )

			return fastcgi_finish_request();

	}

}