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redirect-canonical.php
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redirect-canonical.php
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<?php
/**
* redirect-canonical.php
*
* It handles URLs that miss the /wiki/ prefix. Instead of just adding /wiki/ in front
* of the URLs, the full canonical URL is constructed (using $title->getFullURL).
* This limits number of redirects and redirects to the best possible URL in one run.
*
* This is a simple replacement for Our404Handler and should be configured as follows in
* Apache config:
*
* ErrorDocument 404 /redirect-canonical.php
*/
use \Wikia\Logger\WikiaLogger;
require_once( dirname( __FILE__ ) . '/includes/WebStart.php' );
/**
* Try to construct the MW title out of the given URL path.
*
* If unsuccessful return the title for the main page.
*
* @param $path
* @return Title
*/
function guessTitle( $path ) {
$path = trim( rawurldecode( $path ), '/ _' );
// Hack to better recover Mercury modular home pages URLs
// (they have double-encoded URLs for some reason)
if ( startsWith( $path, 'main/' ) ) {
$path = rawurldecode( $path );
}
$logContext = [
'ex' => new Exception(),
// To verify if Kibana trims the strings:
'uri' => $_SERVER['REQUEST_URI'],
'uriLen' => strlen( $_SERVER['REQUEST_URI'] ),
];
if ( !$path ) {
WikiaLogger::instance()->warning( '404 redirector: malformed URI', $logContext );
}
$path = str_replace( [ '%', '<', '>', '[', ']', '{', '}' ], '_', $path, $count );
if ( $count ) {
WikiaLogger::instance()->warning( '404 redirector: forbidden char in URI', $logContext );
}
$title = Title::newFromText( $path );
if ( !$title ) {
WikiaLogger::instance()->warning( '404 redirector: not a valid title in URI', $logContext );
$title = Title::newMainPage();
}
return $title;
}
/**
* Read superglobal variables and return the URL to redirect to
*
* @return string
*/
function getTargetUrl() {
// Extract the URL path from the REQUEST_URI
$requestUri = $_SERVER['REQUEST_URI'];
if ( filter_var( $requestUri, FILTER_VALIDATE_URL ) ) {
// Possible when using proxies, like curl -x
$path = parse_url( $requestUri, PHP_URL_PATH );
} else {
// Upgrade the URI to a full URL to prevent URIs like Foo:111 being interpreted as host:port
$path = parse_url( 'http://wikia.com/' . $requestUri, PHP_URL_PATH );
}
// Strip the leading slashes
$path = ltrim( $path, '/' );
// Decide which URL to redirect to
if ( stripos( $path, '%2F' ) !== false ) {
// Called by Apache because there was "%2F" (an encoded slash) in the URL.
// @see http://httpd.apache.org/docs/2.2/mod/core.html#allowencodedslashes
$localUrl = '/' . str_ireplace( [ '%2F', '%3A' ], [ '/', ':' ], $path );
$url = wfExpandUrl( $localUrl, PROTO_CANONICAL );
header( 'X-Redirected-By: redirect-canonical.php (encoded slash)' );
} else {
// Called by Apache because the URL matched no rewrite rules
$title = guessTitle( $path );
$url = $title->getFullURL();
header( 'X-Redirected-By: redirect-canonical.php' );
}
// Preserve the query string
if ( isset( $_SERVER['REDIRECT_QUERY_STRING'] ) ) {
// Called from Apache's ErrorHandler
$qs = $_SERVER['REDIRECT_QUERY_STRING'];
} else {
// Called directly
$qs = $_SERVER['QUERY_STRING'];
}
$url = wfAppendQuery( $url, $qs );
return $url;
}
// Issue the redirect
$url = getTargetUrl();
header( 'Location: ' . $url, 302 );
echo sprintf( 'Moved to <a href="%s">%s</a>', htmlspecialchars( $url ), htmlspecialchars( $url ) );