<?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 $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 ) {
if ( !isset( $this->endpoints[$endpoint->path] ) ) {
$this->endpoints[$endpoint->path] = array();
}
$this->endpoints[$endpoint->path][$endpoint->method] = $endpoint;
}
static function is_truthy( $value ) {
switch ( strtolower( (string) $value ) ) {
case '1' :
case 't' :
case 'true' :
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 = ( is_ssl() ? 'https' : '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 = '{' === $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 ) {
$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 ( is_wp_error( $initialization ) ) {
$this->output_error( $initialization );
return;
}
// Normalize path and extract API version
$this->path = untrailingslashit( $this->path );
preg_match( '#^/rest/v1(\.\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 ) {
$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 => $endpoints_by_method ) {
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;
}
$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]->in_testing || 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]->in_testing || 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 ) {
return $this->output( 500, '', 'text/plain' );
} elseif ( is_wp_error( $response ) ) {
return $this->output_error( $response );
}
return $this->output( 200, $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 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;
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;
}
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 ( $callback ) {
echo "$callback(";
}
echo $this->json_encode( $response );
if ( $callback ) {
echo ");";
}
if ( $this->exit ) {
exit;
}
return $content_type;
}
function output_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 $this->output( $status_code, $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 ( -1 == get_option( 'blog_public' ) && !current_user_can( 'read' ) ) {
return new WP_Error( 'unauthorized', 'User cannot access this private blog.', 403 );
}
return $blog_id;
}
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 ) {
add_filter( 'pre_option_show_avatars', '__return_true', 999 );
$_SERVER['HTTPS'] = 'off';
$avatar_img_element = get_avatar( $email, 96, '' );
if ( !$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";
}
$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();
}
}