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<?php
/**
* Provides Common Cartridge v1.1 converter class
*
* @package core
* @subpackage backup-convert
* @copyright 2011 Darko Miletic <dmiletic@moodlerooms.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
require_once($CFG->dirroot.'/backup/converter/convertlib.php');
require_once($CFG->dirroot.'/backup/cc/includes/constants.php');
require_once($CFG->dirroot.'/backup/cc/cc112moodle.php');
require_once($CFG->dirroot.'/backup/cc/validator.php');
class imscc11_converter extends base_converter {
/**
* Log a message
*
* @see parent::log()
* @param string $message message text
* @param int $level message level {@example backup::LOG_WARNING}
* @param null|mixed $a additional information
* @param null|int $depth the message depth
* @param bool $display whether the message should be sent to the output, too
*/
public function log($message, $level, $a = null, $depth = null, $display = false) {
parent::log('(imscc1) '.$message, $level, $a, $depth, $display);
}
/**
* Detects the Common Cartridge 1.0 format of the backup directory
*
* @param string $tempdir the name of the backup directory
* @return null|string backup::FORMAT_IMSCC11 if the Common Cartridge 1.1 is detected, null otherwise
*/
public static function detect_format($tempdir) {
$filepath = make_backup_temp_directory($tempdir, false);
if (!is_dir($filepath)) {
throw new convert_helper_exception('tmp_backup_directory_not_found', $filepath);
}
$manifest = cc112moodle::get_manifest($filepath);
if (file_exists($manifest)) {
// Looks promising, lets load some information.
$handle = fopen($manifest, 'r');
$xml_snippet = fread($handle, 1024);
fclose($handle);
// Check if it has the required strings.
$xml_snippet = strtolower($xml_snippet);
$xml_snippet = preg_replace('/\s*/m', '', $xml_snippet);
$xml_snippet = str_replace("'", '', $xml_snippet);
$xml_snippet = str_replace('"', '', $xml_snippet);
$search_string = "xmlns=http://www.imsglobal.org/xsd/imsccv1p1/imscp_v1p1";
if (strpos($xml_snippet, $search_string) !== false) {
return backup::FORMAT_IMSCC11;
}
}
return null;
}
/**
* Returns the basic information about the converter
*
* The returned array must contain the following keys:
* 'from' - the supported source format, eg. backup::FORMAT_MOODLE1
* 'to' - the supported target format, eg. backup::FORMAT_MOODLE
* 'cost' - the cost of the conversion, non-negative non-zero integer
*/
public static function description() {
return array(
'from' => backup::FORMAT_IMSCC11,
'to' => backup::FORMAT_MOODLE1,
'cost' => 10
);
}
protected function execute() {
global $CFG;
$manifest = cc112moodle::get_manifest($this->get_tempdir_path());
if (empty($manifest)) {
throw new imscc11_convert_exception('No Manifest detected!');
}
$this->log('validating manifest', backup::LOG_DEBUG, null, 1);
$validator = new manifest_validator($CFG->dirroot . '/backup/cc/schemas11');
if (!$validator->validate($manifest)) {
$this->log('validation error(s): '.PHP_EOL.error_messages::instance(), backup::LOG_DEBUG, null, 2);
throw new imscc11_convert_exception(error_messages::instance()->to_string(true));
}
$manifestdir = dirname($manifest);
$cc112moodle = new cc112moodle($manifest);
if ($cc112moodle->is_auth()) {
throw new imscc11_convert_exception('protected_cc_not_supported');
}
$status = $cc112moodle->generate_moodle_xml();
// Final cleanup.
$xml_error = new libxml_errors_mgr(true);
$mdoc = new DOMDocument();
$mdoc->preserveWhiteSpace = false;
$mdoc->formatOutput = true;
$mdoc->validateOnParse = false;
$mdoc->strictErrorChecking = false;
if ($mdoc->load($manifestdir.'/moodle.xml', LIBXML_NONET)) {
$mdoc->save($this->get_workdir_path().'/moodle.xml', LIBXML_NOEMPTYTAG);
} else {
$xml_error->collect();
$this->log('validation error(s): '.PHP_EOL.error_messages::instance(), backup::LOG_DEBUG, null, 2);
throw new imscc11_convert_exception(error_messages::instance()->to_string(true));
}
// Move the files to the workdir.
rename($manifestdir.'/course_files', $this->get_workdir_path().'/course_files');
}
}
/**
* Exception thrown by this converter
*/
class imscc11_convert_exception extends convert_exception {
}