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<?php
/**
* Functions to be used with PHP's output buffer.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
/**
* Standard output handler for use with ob_start
*
* @param string $s
*
* @return string
*/
function wfOutputHandler( $s ) {
global $wgDisableOutputCompression, $wgValidateAllHtml, $wgMangleFlashPolicy;
if ( $wgMangleFlashPolicy ) {
$s = wfMangleFlashPolicy( $s );
}
if ( $wgValidateAllHtml ) {
$headers = headers_list();
$isHTML = false;
foreach ( $headers as $header ) {
$parts = explode( ':', $header, 2 );
if ( count( $parts ) !== 2 ) {
continue;
}
$name = strtolower( trim( $parts[0] ) );
$value = trim( $parts[1] );
if ( $name == 'content-type' && ( strpos( $value, 'text/html' ) === 0
|| strpos( $value, 'application/xhtml+xml' ) === 0 )
) {
$isHTML = true;
break;
}
}
if ( $isHTML ) {
$s = wfHtmlValidationHandler( $s );
}
}
if ( !$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
*
* @return string
*/
function wfRequestExtension() {
/// @todo 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.
*
* @param string $s
*
* @return string
*/
function wfGzipHandler( $s ) {
if ( !function_exists( 'gzencode' ) ) {
wfDebug( __FUNCTION__ . "() skipping compression (gzencode unavailable)\n" );
return $s;
}
if ( headers_sent() ) {
wfDebug( __FUNCTION__ . "() skipping compression (headers already sent)\n" );
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;
}
if ( wfClientAcceptsGzip() ) {
wfDebug( __FUNCTION__ . "() is compressing output\n" );
header( 'Content-Encoding: gzip' );
$s = gzencode( $s, 6 );
}
// Set vary header if it hasn't been set already
$headers = headers_list();
$foundVary = false;
foreach ( $headers as $header ) {
$headerName = strtolower( substr( $header, 0, 5 ) );
if ( $headerName == 'vary:' ) {
$foundVary = true;
break;
}
}
if ( !$foundVary ) {
header( 'Vary: Accept-Encoding' );
global $wgUseKeyHeader;
if ( $wgUseKeyHeader ) {
header( 'Key: Accept-Encoding;match=gzip' );
}
}
return $s;
}
/**
* Mangle flash policy tags which open up the site to XSS attacks.
*
* @param string $s
*
* @return string
*/
function wfMangleFlashPolicy( $s ) {
# Avoid weird excessive memory usage in PCRE on big articles
if ( preg_match( '/\<\s*cross-domain-policy(?=\s|\>)/i', $s ) ) {
return preg_replace( '/\<(\s*)(cross-domain-policy(?=\s|\>))/i', '<$1NOT-$2', $s );
} else {
return $s;
}
}
/**
* Add a Content-Length header if possible. This makes it cooperate with CDN better.
*
* @param int $length
*/
function wfDoContentLength( $length ) {
if ( !headers_sent()
&& isset( $_SERVER['SERVER_PROTOCOL'] )
&& $_SERVER['SERVER_PROTOCOL'] == 'HTTP/1.0'
) {
header( "Content-Length: $length" );
}
}
/**
* Replace the output with an error if the HTML is not valid
*
* @param string $s
*
* @return string
*/
function wfHtmlValidationHandler( $s ) {
$errors = '';
if ( MWTidy::checkErrors( $s, $errors ) ) {
return $s;
}
header( 'Cache-Control: no-cache' );
$out = Html::element( 'h1', null, 'HTML validation error' );
$out .= Html::openElement( 'ul' );
$error = strtok( $errors, "\n" );
$badLines = [];
while ( $error !== false ) {
if ( preg_match( '/^line (\d+)/', $error, $m ) ) {
$lineNum = intval( $m[1] );
$badLines[$lineNum] = true;
$out .= Html::rawElement( 'li', null,
Html::element( 'a', [ 'href' => "#line-{$lineNum}" ], $error ) ) . "\n";
}
$error = strtok( "\n" );
}
$out .= Html::closeElement( 'ul' );
$out .= Html::element( 'pre', null, $errors );
$out .= Html::openElement( 'ol' ) . "\n";
$line = strtok( $s, "\n" );
$i = 1;
while ( $line !== false ) {
$attrs = [];
if ( isset( $badLines[$i] ) ) {
$attrs['class'] = 'highlight';
$attrs['id'] = "line-$i";
}
$out .= Html::element( 'li', $attrs, $line ) . "\n";
$line = strtok( "\n" );
$i++;
}
$out .= Html::closeElement( 'ol' );
$style = <<<CSS
.highlight { background-color: #ffc }
li { white-space: pre }
CSS;
$out = Html::htmlHeader( [ 'lang' => 'en', 'dir' => 'ltr' ] ) .
Html::rawElement( 'head', null,
Html::element( 'title', null, 'HTML validation error' ) .
Html::inlineStyle( $style ) ) .
Html::rawElement( 'body', null, $out ) .
Html::closeElement( 'html' );
return $out;
}