classes/i18n/LanguageAction.inc.php

<?php
// $Id: LanguageAction.inc.php,v 1.5 2008/07/01 01:16:09 asmecher Exp $


define('LANGUAGE_PACK_DESCRIPTOR_URL', 'http://pkp.sfu.ca/ojs/xml/%s/locales.xml');
define('LANGUAGE_PACK_TAR_URL', 'http://pkp.sfu.ca/ojs/xml/%s/%s.tar.gz');

if (!function_exists('stream_get_contents')) {
   function stream_get_contents($fp) {
      fflush($fp);
   }
}

class LanguageAction {
   function LanguageAction() {
   }

   function isDownloadAvailable() {
      // Check to see that proc_open is available
      if (!function_exists('proc_open')) return false;

      // Check to see that we're using at least PHP 4.3 for
      // stream_set_blocking.
      if (!version_compare(phpversion(), '4.3.0')) return false;

      // Check to see that tar can be executed
      $fds = array(
         0 => array('pipe', 'r'),
         1 => array('pipe', 'w'),
         2 => array('pipe', 'w')
      );
      $pipes = $process = null;
      @$process = proc_open('tar --version', $fds, $pipes);
      if (!is_resource($process)) return false;
      fclose($pipes[0]); // No input necessary
      stream_get_contents($pipes[1]); // Flush pipes. fflush seems to
      stream_get_contents($pipes[2]); // behave oddly, so it's avoided
      fclose($pipes[1]);
      fclose($pipes[2]);
      if (proc_close($process) !== 0) return false;

      // Check that we can write to a few locations
      if (!is_file(LOCALE_REGISTRY_FILE) || !is_writable(LOCALE_REGISTRY_FILE)) return false;

      return true;
   }

   function getDownloadableLocales() {
      $versionDao =& DAORegistry::getDAO('VersionDAO');
      $version =& $versionDao->getCurrentVersion();
      $versionString = $version->getVersionString();

      $descriptorFilename = sprintf(LANGUAGE_PACK_DESCRIPTOR_URL, $versionString);
      return Locale::loadLocaleList($descriptorFilename);
   }

   function downloadLocale($locale, &$errors) {
      $downloadableLocales =& $this->getDownloadableLocales();
      if (!is_array($downloadableLocales) || !isset($downloadableLocales[$locale])) {
         $errors[] = Locale::translate('admin.languages.download.cannotOpen');
         return false;
      }

      $versionDao =& DAORegistry::getDAO('VersionDAO');
      $version =& $versionDao->getCurrentVersion();
      $versionString = $version->getVersionString();

      // Set up to download and extract the language pack
      $fds = array(
         0 => array('pipe', 'r'),
         1 => array('pipe', 'w'),
         2 => array('pipe', 'w')
      );
      $pipes = null;
      $process = proc_open('tar -x -z --wildcards \\*' . $locale . '\\*.xml \\*' . $locale . '\\*.png', $fds, $pipes);
      if (!is_resource($process)) return false;

      // Download and feed the pack to the tar process
      $languagePackUrl = sprintf(LANGUAGE_PACK_TAR_URL, $versionString, $locale);
      $wrapper =& FileWrapper::wrapper($languagePackUrl);
      if (!$wrapper->open()) {
         $errors[] = Locale::translate('admin.languages.download.cannotOpen');
      }

      stream_set_blocking($pipes[0], 0);
      stream_set_blocking($pipes[1], 0);
      stream_set_blocking($pipes[2], 0);

      $pipeStdout = $pipeStderr = '';
      while ($data = $wrapper->read()) {
         fwrite($pipes[0], $data);
         $pipeStdout .= fgets($pipes[1]);
         $pipeStderr .= fgets($pipes[2]);
      }
      fclose($pipes[0]);
      fclose($pipes[1]);
      fclose($pipes[2]);
      unset($wrapper);

      if (!empty($pipeStderr)) {
         $errors[] = $pipeStderr;
         return false;
      }

      // Finish up the tar process
      if (proc_close($process) !== 0) return false;

      // The tar file has now been extracted -- check whether the
      // locales list needs to have the new locale added.
      $locales = Locale::getAllLocales();
      if (!isset($locales[$locale])) {
         // The locale does not exist in the local locale list
         $wrapper =& FileWrapper::wrapper(LOCALE_REGISTRY_FILE);
         $contents = $wrapper->contents();
         $pos = strpos($contents, '</locales>');
         if ($pos === false) {
            // Unable to locate insert point for new locale
            $errors[] = Locale::translate('admin.languages.download.cannotModifyRegistry');
            return false;
         }
         $contents = substr_replace($contents, "\t<locale key=\"$locale\" name=\"" . $downloadableLocales[$locale]['name'] . "\" />\n", $pos, 0);
         $fp = fopen(LOCALE_REGISTRY_FILE, 'w');
         if (!$fp) {
            // Unable to locate insert point for new locale
            $errors[] = Locale::translate('admin.languages.download.cannotModifyRegistry');
            return false;
         }
         fwrite($fp, $contents);
         fclose($fwrite);
      }

      return true;
   }
}

?>

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