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<?php
/**
* Standard output handler for use with ob_start
*/
function wfOutputHandler( $s ) {
global $wgDisableOutputCompression;
$s = wfMangleFlashPolicy( $s );
if ( !$wgDisableOutputCompression && !ini_get( 'zlib.output_compression' ) ) {
if ( !defined( 'MW_NO_OUTPUT_COMPRESSION' ) ) {
$s = wfGzipHandler( $s );
}
if ( !ini_get( 'output_handler' ) ) {
wfDoContentLength( strlen( $s ) );
}
}
return $s;
}
/**
* Get the "file extension" that some client apps will estimate from
* the currently-requested URL.
* This isn't on WebRequest because we need it when things aren't initialized
* @private
*/
function wfRequestExtension() {
/// @fixme -- this sort of dupes some code in WebRequest::getRequestUrl()
if( isset( $_SERVER['REQUEST_URI'] ) ) {
// Strip the query string...
list( $path ) = explode( '?', $_SERVER['REQUEST_URI'], 2 );
} elseif( isset( $_SERVER['SCRIPT_NAME'] ) ) {
// Probably IIS. QUERY_STRING appears separately.
$path = $_SERVER['SCRIPT_NAME'];
} else {
// Can't get the path from the server? :(
return '';
}
$period = strrpos( $path, '.' );
if( $period !== false ) {
return strtolower( substr( $path, $period ) );
}
return '';
}
/**
* Handler that compresses data with gzip if allowed by the Accept header.
* Unlike ob_gzhandler, it works for HEAD requests too.
*/
function wfGzipHandler( $s ) {
if( !function_exists( 'gzencode' ) || headers_sent() ) {
return $s;
}
$ext = wfRequestExtension();
if( $ext == '.gz' || $ext == '.tgz' ) {
// Don't do gzip compression if the URL path ends in .gz or .tgz
// This confuses Safari and triggers a download of the page,
// even though it's pretty clearly labeled as viewable HTML.
// Bad Safari! Bad!
return $s;
}
$tokens = preg_split( '/[,; ]/', $_SERVER['HTTP_ACCEPT_ENCODING'] );
if ( in_array( 'gzip', $tokens ) ) {
header( 'Content-Encoding: gzip' );
$s = gzencode( $s, 3 );
}
// Set vary header if it hasn't been set already
$headers = headers_list();
$foundVary = false;
foreach ( $headers as $header ) {
if ( substr( $header, 0, 5 ) == 'Vary:' ) {
$foundVary = true;
break;
}
}
if ( !$foundVary ) {
header( 'Vary: Accept-Encoding' );
}
return $s;
}
/**
* Mangle flash policy tags which open up the site to XSS attacks.
*/
function wfMangleFlashPolicy( $s ) {
return preg_replace( '/\<\s*cross-domain-policy\s*\>/i', '<NOT-cross-domain-policy>', $s );
}
/**
* Add a Content-Length header if possible. This makes it cooperate with squid better.
*/
function wfDoContentLength( $length ) {
if ( !headers_sent() && $_SERVER['SERVER_PROTOCOL'] == 'HTTP/1.0' ) {
header( "Content-Length: $length" );
}
}
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