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<?php
/**
* WordPress redirect module.
*
* Provides PHP controlled redirects and monitoring and is the core of the front-end redirection.
*/
class WordPress_Module extends Red_Module {
/**
* @var integer
*/
const MODULE_ID = 1;
/**
* Can we log?
*
* @var boolean
*/
private $can_log = true;
/**
* The target redirect URL
*
* @var string|false
*/
private $redirect_url = false;
/**
* The target redirect code
*
* @var integer
*/
private $redirect_code = 0;
/**
* Copy of redirects that match the requested URL
*
* @var Red_Item[]
*/
private $redirects = [];
/**
* Matched redirect
*
* @var Red_Item|false
*/
private $matched = false;
/**
* Return the module ID
*
* @return integer
*/
public function get_id() {
return self::MODULE_ID;
}
/**
* Return the module name
*
* @return string
*/
public function get_name() {
return 'WordPress';
}
/**
* Start the module. Hooks any filters and actions
*
* @return void
*/
public function start() {
// Only run redirect rules if we're not disabled
if ( ! red_is_disabled() ) {
// Canonical site settings - https, www, relocate, and aliases
add_action( 'init', [ $this, 'canonical_domain' ] );
// The main redirect loop
add_action( 'init', [ $this, 'init' ] );
// Send site HTTP headers as well as 410 error codes
add_action( 'send_headers', [ $this, 'send_headers' ] );
// Redirect HTTP headers and server-specific overrides
add_filter( 'wp_redirect', [ $this, 'wp_redirect' ], 1, 2 );
// Allow permalinks to be redirected
add_filter( 'pre_handle_404', [ $this, 'pre_handle_404' ], 10, 2 );
// Cache support
add_action( 'redirection_matched', [ $this, 'cache_redirects' ], 10, 3 );
add_action( 'redirection_last', [ $this, 'cache_unmatched_redirects' ], 10, 3 );
}
// Setup the various filters and actions that allow Redirection to happen
add_action( 'redirection_visit', [ $this, 'redirection_visit' ], 10, 3 );
add_action( 'redirection_do_nothing', [ $this, 'redirection_do_nothing' ] );
// Prevent WordPress overriding a canonical redirect
add_filter( 'redirect_canonical', [ $this, 'redirect_canonical' ], 10, 2 );
// Log 404s and perform 'URL and WordPress page type' redirects
add_action( 'template_redirect', [ $this, 'template_redirect' ] );
// Back-compat for < database 4.2
add_filter( 'redirection_404_data', [ $this, 'log_back_compat' ] );
add_filter( 'redirection_log_data', [ $this, 'log_back_compat' ] );
// Record the redirect agent
add_filter( 'x_redirect_by', [ $this, 'record_redirect_by' ], 90 );
}
/**
* Called after no redirect is matched. This allows us to cache a negative result/
*
* @param string $url URL.
* @param WordPress_Module $wp This.
* @param array $redirects Array of redirects.
* @return void
*/
public function cache_unmatched_redirects( $url, $wp, $redirects ) {
if ( $this->matched ) {
return;
}
$this->cache_redirects( $url, $this->matched, $redirects );
}
/**
* Called when a redirect is matched. This allows us to cache a positive result.
*
* @param string $url URL.
* @param Red_Item|false $matched_redirect Matched redirect.
* @param array $redirects Array of redirects.
* @return void
*/
public function cache_redirects( $url, $matched_redirect, $redirects ) {
$cache = Redirect_Cache::init();
$cache->set( $url, $matched_redirect, $redirects );
}
/**
* If we have a 404 then check for any permalink migrations
*
* @param boolean $result Return result.
* @param WP_Query $query WP_Query object.
* @return boolean
*/
public function pre_handle_404( $result, WP_Query $query ) {
$options = red_get_options();
if ( count( $options['permalinks'] ) > 0 ) {
include_once dirname( dirname( __FILE__ ) ) . '/models/permalinks.php';
$permalinks = new Red_Permalinks( $options['permalinks'] );
$permalinks->migrate( $query );
}
return $result;
}
/**
* Back-compatability for Redirection databases older than 4.2. Prevents errors from storing data that has no DB column
*
* @param array $insert Data to log.
* @return array
*/
public function log_back_compat( $insert ) {
// Remove columns not supported in older versions
$status = new Red_Database_Status();
if ( ! $status->does_support( '4.2' ) ) {
foreach ( [ 'request_data', 'request_method', 'http_code', 'domain', 'redirect_by' ] as $ignore ) {
unset( $insert[ $ignore ] );
}
}
return $insert;
}
/**
* This ensures that a matched URL is not overriddden by WordPress, if the URL happens to be a WordPress URL of some kind
* For example: /?author=1 will be redirected to /author/name unless this returns false
*
* @param string $redirect_url The redirected URL.
* @param string $requested_url The requested URL.
* @return string|false
*/
public function redirect_canonical( $redirect_url, $requested_url ) {
if ( $this->matched ) {
return false;
}
return $redirect_url;
}
/**
* WordPress 'template_redirect' hook. Used to check for 404s
*
* @return void
*/
public function template_redirect() {
if ( ! is_404() || $this->matched ) {
return;
}
$this->is_url_and_page_type();
$options = red_get_options();
if ( isset( $options['expire_404'] ) && $options['expire_404'] >= 0 && $this->can_log() ) {
$details = [
'agent' => Redirection_Request::get_user_agent(),
'referrer' => Redirection_Request::get_referrer(),
'request_method' => Redirection_Request::get_request_method(),
'http_code' => 404,
];
if ( $options['log_header'] ) {
$details['request_data'] = [
'headers' => Redirection_Request::get_request_headers(),
];
}
Red_404_Log::create( Redirection_Request::get_server(), Redirection_Request::get_request_url(), Redirection_Request::get_ip(), $details );
}
}
/**
* Return `true` if any of the matched redirects is a 'url and page type', `false` otherwise
*
* @return boolean
*/
private function is_url_and_page_type() {
$page_types = array_values( array_filter( $this->redirects, function( Red_Item $redirect ) {
return $redirect->match && $redirect->match->get_type() === 'page';
} ) );
if ( count( $page_types ) > 0 ) {
$request = new Red_Url_Request( Redirection_Request::get_request_url() );
$action = $page_types[0]->get_match( $request->get_decoded_url(), $request->get_original_url() );
if ( $action ) {
$action->run();
}
return true;
}
return false;
}
/**
* Called by a 'do nothing' action. Return true to stop further processing of the 'do nothing'
*
* @return boolean
*/
public function redirection_do_nothing() {
$this->can_log = false;
return true;
}
/**
* Action fired when a redirect is performed, and used to log the data
*
* @param Red_Item $redirect The redirect.
* @param string $url The source URL.
* @param string $target The target URL.
* @return void
*/
public function redirection_visit( $redirect, $url, $target ) {
$redirect->visit( $url, $target );
}
/**
* Get canonical target
*
* @return string|false
*/
public function get_canonical_target() {
$options = red_get_options();
$canonical = new Redirection_Canonical( $options['https'], $options['preferred_domain'], $options['aliases'], get_home_url() );
// Relocate domain?
if ( $options['relocate'] ) {
return $canonical->relocate_request( $options['relocate'], Redirection_Request::get_server_name(), Redirection_Request::get_request_url() );
}
// Force HTTPS or www
return $canonical->get_redirect( Redirection_Request::get_request_server_name(), Redirection_Request::get_request_url() );
}
/**
* Checks for canonical domain requests
*
* @return void
*/
public function canonical_domain() {
$target = $this->get_canonical_target();
if ( $target ) {
// phpcs:ignore
wp_redirect( $target, 301, 'redirection' );
die();
}
}
/**
* Redirection 'main loop'. Checks the currently requested URL against the database and perform a redirect, if necessary.
*
* @return void
*/
public function init() {
if ( $this->matched ) {
return;
}
$request = new Red_Url_Request( Redirection_Request::get_request_url() );
// Make sure we don't try and redirect something essential
if ( $request->is_valid() && ! $request->is_protected_url() ) {
do_action( 'redirection_first', $request->get_decoded_url(), $this );
// Get all redirects that match the URL
$redirects = Red_Item::get_for_url( $request->get_decoded_url() );
// Redirects will be ordered by position. Run through the list until one fires
foreach ( (array) $redirects as $item ) {
$action = $item->get_match( $request->get_decoded_url(), $request->get_original_url() );
if ( $action ) {
$this->matched = $item;
do_action( 'redirection_matched', $request->get_decoded_url(), $item, $redirects );
$action->run();
break;
}
}
// We will only get here if there is no match (check $this->matched) or the action does not result in redirecting away
do_action( 'redirection_last', $request->get_decoded_url(), $this, $redirects );
if ( ! $this->matched ) {
// Keep them for later
$this->redirects = $redirects;
}
}
}
/**
* Fix for incorrect headers sent when using FastCGI/IIS
*
* @param string $status HTTP status line.
* @return string
*/
public function status_header( $status ) {
if ( substr( php_sapi_name(), 0, 3 ) === 'cgi' ) {
return str_replace( 'HTTP/1.1', 'Status:', $status );
}
return $status;
}
/**
* Add any custom HTTP headers to the response.
*
* @param array $obj Some object.
* @return void
*/
public function send_headers( $obj ) {
if ( ! empty( $this->matched ) && $this->matched->action && $this->matched->action->get_code() === 410 ) {
add_filter( 'status_header', [ $this, 'set_header_410' ] );
}
// Add any custom headers
$options = red_get_options();
$headers = new Red_Http_Headers( $options['headers'] );
$headers->run( $headers->get_site_headers() );
}
/**
* Add support for a 410 response.
*
* @return string
*/
public function set_header_410() {
return 'HTTP/1.1 410 Gone';
}
/**
* IIS fix. Don't know if this is still needed
*
* @param string $url URL.
* @return void
*/
private function iis_fix( $url ) {
global $is_IIS;
if ( $is_IIS ) {
header( "Refresh: 0;url=$url" );
}
}
/**
* Don't know if this is still needed
*
* @param string $url URL.
* @param integer $status HTTP status code.
* @return void
*/
private function cgi_fix( $url, $status ) {
if ( $status === 301 && php_sapi_name() === 'cgi-fcgi' ) {
$servers_to_check = [ 'lighttpd', 'nginx' ];
$server = '';
if ( isset( $_SERVER['SERVER_SOFTWARE'] ) && is_string( $_SERVER['SERVER_SOFTWARE'] ) ) {
$server = sanitize_text_field( $_SERVER['SERVER_SOFTWARE'] );
}
foreach ( $servers_to_check as $name ) {
if ( stripos( $server, $name ) !== false ) {
status_header( $status );
header( "Location: $url" );
exit( 0 );
}
}
}
}
/**
* Get a 'source' for a redirect by digging through the backtrace.
*
* @return string[]
*/
private function get_redirect_source() {
$ignore = [
'WP_Hook',
'template-loader.php',
'wp-blog-header.php',
];
// phpcs:ignore
$source = wp_debug_backtrace_summary( null, 5, false );
return array_filter( $source, function( $item ) use ( $ignore ) {
foreach ( $ignore as $ignore_item ) {
if ( strpos( $item, $ignore_item ) !== false ) {
return false;
}
}
return true;
} );
}
/**
* Record a redirect.
*
* @param string $agent Redirect agent.
* @return string
*/
public function record_redirect_by( $agent ) {
// Have we already redirected with Redirection?
if ( $this->matched || $agent === 'redirection' ) {
return $agent;
}
$options = red_get_options();
if ( ! $options['log_external'] ) {
return $agent;
}
$details = [
'target' => $this->redirect_url,
'agent' => Redirection_Request::get_user_agent(),
'referrer' => Redirection_Request::get_referrer(),
'request_method' => Redirection_Request::get_request_method(),
'redirect_by' => $agent ? $agent : 'wordpress',
'http_code' => $this->redirect_code,
'request_data' => [
'source' => array_values( $this->get_redirect_source() ),
],
];
if ( $options['log_header'] ) {
$details['request_data']['headers'] = Redirection_Request::get_request_headers();
}
Red_Redirect_Log::create( Redirection_Request::get_server(), Redirection_Request::get_request_url(), Redirection_Request::get_ip(), $details );
return $agent;
}
/**
* Perform any pre-redirect processing, such as logging and header fixing.
*
* @param string $url Target URL.
* @param integer $status HTTP status.
* @return string
*/
public function wp_redirect( $url, $status = 302 ) {
global $wp_version;
$this->redirect_url = $url;
$this->redirect_code = $status;
$this->iis_fix( $url );
$this->cgi_fix( $url, $status );
if ( intval( $status, 10 ) === 307 ) {
status_header( $status );
nocache_headers();
return $url;
}
$options = red_get_options();
$headers = new Red_Http_Headers( $options['headers'] );
$headers->run( $headers->get_redirect_headers() );
// Do we need to set the cache header?
if ( ! headers_sent() && isset( $options['redirect_cache'] ) && $options['redirect_cache'] !== 0 && intval( $status, 10 ) === 301 ) {
if ( $options['redirect_cache'] === -1 ) {
// No cache - just use WP function
nocache_headers();
} else {
// Custom cache
header( 'Expires: ' . gmdate( 'D, d M Y H:i:s T', time() + $options['redirect_cache'] * 60 * 60 ) );
header( 'Cache-Control: max-age=' . $options['redirect_cache'] * 60 * 60 );
}
}
status_header( $status );
return $url;
}
/**
* Reset the module. Used for unit tests
*
* @param Red_Item|false $matched Set the `matched` var.
* @return void
*/
public function reset( $matched = false ) {
$this->can_log = true;
$this->matched = $matched;
}
/**
* Can we log a redirect?
*
* @return boolean
*/
public function can_log() {
return apply_filters( 'redirection_log_404', $this->can_log );
}
}
