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