<?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
      {
          // Version prior to 8.0 can be enabled without deprecation
          if (\PHP_VERSION_ID < 80000) {
              return true;
          }
  
          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)
  ",
                  \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;
      }
  }