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<?php
namespace MediaWiki\Registration;
use Exception;
use MediaWiki\Html\TemplateParser;
use Wikimedia\Http\HttpStatus;
use Wikimedia\ObjectCache\EmptyBagOStuff;
/**
* Thrown when ExtensionRegistry cannot open the extension.json or skin.json file.
*
* We handle this case specially, because it is one of the more
* common errors a new MW sysadmin is likely to encounter and we
* want their initial experience to be good. wfLoadExtension()
* generally happens before MWExceptionRenderer gets installed
* so we cannot use that.
*
* @ingroup ExtensionRegistry
* @internal
*/
class MissingExtensionException extends Exception {
private bool $isSkin;
private string $extName = 'unknown';
private string $path;
private string $error;
/**
* @param string $path Path of file that cannot be read
* @param string $error Text of error mtime gave
*/
public function __construct( string $path, string $error ) {
$this->isSkin = str_ends_with( $path, "/skin.json" );
$m = [];
preg_match( "!/([^/]*)/[^/]*.json$!", $path, $m );
if ( $m ) {
$this->extName = $m[1];
}
$this->path = $path;
$this->error = $error;
parent::__construct( "Error Loading extension. Unable to open file $path: $error" );
}
/**
* Output error message as html.
*
* Avoid relying on MW stuff, as it might not be setup yet.
* We don't bother translating, as the user may not have even set lang yet.
*
*/
private function renderHtml() {
if ( !headers_sent() ) {
HttpStatus::header( 500 );
header( 'Content-Type: text/html; charset=UTF-8' );
}
$templateParser = new TemplateParser( null, new EmptyBagOStuff() );
try {
echo $templateParser->processTemplate(
'ExtensionConfigError',
[
'version' => MW_VERSION,
'path' => $this->path,
'type' => $this->isSkin ? 'skin' : 'extension',
'error' => $this->error,
'extName' => $this->extName,
'trace' => $this->getTraceAsString(),
'mwLogo' => $this->getMWLogo(),
]
);
} catch ( Exception $e ) {
echo 'Error: ' . htmlspecialchars( $e->getMessage() );
}
}
/**
* Render the error for CLI
*/
private function renderText() {
$type = $this->isSkin ? 'skin' : 'extension';
echo "Error: The $this->extName $type cannot be loaded. "
. "Check that all of its files are installed properly.\n\n";
echo $this->getTraceAsString();
echo "\n";
}
/**
* Output an error response and exit.
*
* @return never
*/
public function render() {
if ( wfIsCli() ) {
$this->renderText();
} else {
$this->renderHtml();
}
// Make sure that the error gets into logs.
// This will also stop execution.
trigger_error( $this->getMessage(), E_USER_ERROR );
}
/**
* Get the url for the MW logo
*
* @return string
*/
private function getMWLogo() {
global $wgResourceBasePath;
$suffix = "/resources/assets/mediawiki.png";
if ( $wgResourceBasePath !== null ) {
// We are early in setup, so we can't rely on this.
return $wgResourceBasePath . $suffix;
}
$path = '/';
foreach ( array_filter( explode( '/', $_SERVER['PHP_SELF'] ) ) as $part ) {
if ( !preg_match( '/\.php$/', $part ) ) {
$path .= "$part/";
} else {
break;
}
}
return $path . $suffix;
}
}
/** @deprecated class alias since 1.43 */
class_alias( MissingExtensionException::class, 'MissingExtensionException' );