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<?php
/**
* Contains class with wrapper around font-config.
*
* @author Niklas Laxström
* @author Harry Burt
* @license Unlicense
* @file
*/
/**
* Wrapper around font-config to get useful ttf font given a language code.
* Uses wfShellExec, wfEscapeShellArg and wfDebugLog, wfGetCache and
* wfMemckey from %MediaWiki.
*
* @ingroup Stats
*/
class FCFontFinder {
/**
* Searches for suitable font in the system.
* @param string $code Language code.
* @return bool|string Full path to the font file, false on failure
*/
public static function findFile( $code ) {
$data = self::callFontConfig( $code );
if ( is_array( $data ) ) {
return $data['file'];
}
return false;
}
/**
* Searches for suitable font family in the system.
* @param string $code Language code.
* @return bool|string Name of font family, false on failure
*/
public static function findFamily( $code ) {
$data = self::callFontConfig( $code );
if ( is_array( $data ) ) {
return $data['family'];
}
return false;
}
protected static function callFontConfig( $code ) {
if ( ini_get( 'open_basedir' ) ) {
wfDebugLog( 'fcfont', 'Disabled because of open_basedir is active' );
// Most likely we can't access any fonts we might find
return false;
}
$cache = self::getCache();
$cachekey = wfMemcKey( 'fcfont', $code );
$timeout = 60 * 60 * 12;
$cached = $cache->get( $cachekey );
if ( is_array( $cached ) ) {
return $cached;
} elseif ( $cached === 'NEGATIVE' ) {
return false;
}
$code = wfEscapeShellArg( ":lang=$code" );
$ok = 0;
$cmd = "fc-match $code";
$suggestion = wfShellExec( $cmd, $ok );
wfDebugLog( 'fcfont', "$cmd returned $ok" );
if ( $ok !== 0 ) {
wfDebugLog( 'fcfont', "fc-match error output: $suggestion" );
$cache->set( $cachekey, 'NEGATIVE', $timeout );
return false;
}
$pattern = '/^(.*?): "(.*)" "(.*)"$/';
$matches = [];
if ( !preg_match( $pattern, $suggestion, $matches ) ) {
wfDebugLog( 'fcfont', "fc-match: return format not understood: $suggestion" );
$cache->set( $cachekey, 'NEGATIVE', $timeout );
return false;
}
list( , $file, $family, $type ) = $matches;
wfDebugLog( 'fcfont', "fc-match: got $file: $family $type" );
$file = wfEscapeShellArg( $file );
$family = wfEscapeShellArg( $family );
$type = wfEscapeShellArg( $type );
$cmd = "fc-list $family $type $code file | grep $file";
$candidates = trim( wfShellExec( $cmd, $ok ) );
wfDebugLog( 'fcfont', "$cmd returned $ok" );
if ( $ok !== 0 ) {
wfDebugLog( 'fcfont', "fc-list error output: $candidates" );
$cache->set( $cachekey, 'NEGATIVE', $timeout );
return false;
}
# trim spaces
$files = array_map( 'trim', explode( "\n", $candidates ) );
$count = count( $files );
if ( !$count ) {
wfDebugLog( 'fcfont', "fc-list got zero canditates: $candidates" );
}
# remove the trailing ":"
$chosen = substr( $files[0], 0, -1 );
wfDebugLog( 'fcfont', "fc-list got $count candidates; using $chosen" );
$data = [
'family' => $family,
'type' => $type,
'file' => $chosen,
];
$cache->set( $cachekey, $data, $timeout );
return $data;
}
/**
* @return BagOStuff
*/
protected static function getCache() {
return wfGetCache( CACHE_ANYTHING );
}
}
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