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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Translation\Util;
use Symfony\Component\Translation\Exception\InvalidArgumentException;
use Symfony\Component\Translation\Exception\InvalidResourceException;
/**
* Provides some utility methods for XLIFF translation files, such as validating
* their contents according to the XSD schema.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class XliffUtils
{
/**
* Gets xliff file version based on the root "version" attribute.
*
* Defaults to 1.2 for backwards compatibility.
*
* @throws InvalidArgumentException
*/
public static function getVersionNumber(\DOMDocument $dom): string
{
/** @var \DOMNode $xliff */
foreach ($dom->getElementsByTagName('xliff') as $xliff) {
$version = $xliff->attributes->getNamedItem('version');
if ($version) {
return $version->nodeValue;
}
$namespace = $xliff->attributes->getNamedItem('xmlns');
if ($namespace) {
if (0 !== substr_compare('urn:oasis:names:tc:xliff:document:', $namespace->nodeValue, 0, 34)) {
throw new InvalidArgumentException(sprintf('Not a valid XLIFF namespace "%s".', $namespace));
}
return substr($namespace, 34);
}
}
// Falls back to v1.2
return '1.2';
}
/**
* Validates and parses the given file into a DOMDocument.
*
* @throws InvalidResourceException
*/
public static function validateSchema(\DOMDocument $dom): array
{
$xliffVersion = static::getVersionNumber($dom);
$internalErrors = libxml_use_internal_errors(true);
if ($shouldEnable = self::shouldEnableEntityLoader()) {
$disableEntities = libxml_disable_entity_loader(false);
}
try {
$isValid = @$dom->schemaValidateSource(self::getSchema($xliffVersion));
if (!$isValid) {
return self::getXmlErrors($internalErrors);
}
} finally {
if ($shouldEnable) {
libxml_disable_entity_loader($disableEntities);
}
}
$dom->normalizeDocument();
libxml_clear_errors();
libxml_use_internal_errors($internalErrors);
return [];
}
private static function shouldEnableEntityLoader(): bool
{
static $dom, $schema;
if (null === $dom) {
$dom = new \DOMDocument();
$dom->loadXML('<?xml version="1.0"?><test/>');
$tmpfile = tempnam(sys_get_temp_dir(), 'symfony');
register_shutdown_function(static function () use ($tmpfile) {
@unlink($tmpfile);
});
$schema = '<?xml version="1.0" encoding="utf-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:include schemaLocation="file:///'.str_replace('\\', '/', $tmpfile).'" />
</xsd:schema>';
file_put_contents($tmpfile, '<?xml version="1.0" encoding="utf-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:element name="test" type="testType" />
<xsd:complexType name="testType"/>
</xsd:schema>');
}
return !@$dom->schemaValidateSource($schema);
}
public static function getErrorsAsString(array $xmlErrors): string
{
$errorsAsString = '';
foreach ($xmlErrors as $error) {
$errorsAsString .= sprintf("[%s %s] %s (in %s - line %d, column %d)\n",
\LIBXML_ERR_WARNING === $error['level'] ? 'WARNING' : 'ERROR',
$error['code'],
$error['message'],
$error['file'],
$error['line'],
$error['column']
);
}
return $errorsAsString;
}
private static function getSchema(string $xliffVersion): string
{
if ('1.2' === $xliffVersion) {
$schemaSource = file_get_contents(__DIR__.'/../Resources/schemas/xliff-core-1.2-strict.xsd');
$xmlUri = 'http://www.w3.org/2001/xml.xsd';
} elseif ('2.0' === $xliffVersion) {
$schemaSource = file_get_contents(__DIR__.'/../Resources/schemas/xliff-core-2.0.xsd');
$xmlUri = 'informativeCopiesOf3rdPartySchemas/w3c/xml.xsd';
} else {
throw new InvalidArgumentException(sprintf('No support implemented for loading XLIFF version "%s".', $xliffVersion));
}
return self::fixXmlLocation($schemaSource, $xmlUri);
}
/**
* Internally changes the URI of a dependent xsd to be loaded locally.
*/
private static function fixXmlLocation(string $schemaSource, string $xmlUri): string
{
$newPath = str_replace('\\', '/', __DIR__).'/../Resources/schemas/xml.xsd';
$parts = explode('/', $newPath);
$locationstart = 'file:///';
if (0 === stripos($newPath, 'phar://')) {
$tmpfile = tempnam(sys_get_temp_dir(), 'symfony');
if ($tmpfile) {
copy($newPath, $tmpfile);
$parts = explode('/', str_replace('\\', '/', $tmpfile));
} else {
array_shift($parts);
$locationstart = 'phar:///';
}
}
$drive = '\\' === \DIRECTORY_SEPARATOR ? array_shift($parts).'/' : '';
$newPath = $locationstart.$drive.implode('/', array_map('rawurlencode', $parts));
return str_replace($xmlUri, $newPath, $schemaSource);
}
/**
* Returns the XML errors of the internal XML parser.
*/
private static function getXmlErrors(bool $internalErrors): array
{
$errors = [];
foreach (libxml_get_errors() as $error) {
$errors[] = [
'level' => \LIBXML_ERR_WARNING == $error->level ? 'WARNING' : 'ERROR',
'code' => $error->code,
'message' => trim($error->message),
'file' => $error->file ?: 'n/a',
'line' => $error->line,
'column' => $error->column,
];
}
libxml_clear_errors();
libxml_use_internal_errors($internalErrors);
return $errors;
}
}
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