/**
* Return the launch data for a given external tool.
*
* @param int $toolid the external tool instance id
* @return array of warnings and launch data
* @since Moodle 3.0
* @throws moodle_exception
*/
public static function get_tool_launch_data($toolid)
{
global $DB, $CFG;
require_once $CFG->dirroot . '/mod/lti/lib.php';
$params = self::validate_parameters(self::get_tool_launch_data_parameters(), array('toolid' => $toolid));
$warnings = array();
// Request and permission validation.
$lti = $DB->get_record('lti', array('id' => $params['toolid']), '*', MUST_EXIST);
list($course, $cm) = get_course_and_cm_from_instance($lti, 'lti');
$context = context_module::instance($cm->id);
self::validate_context($context);
require_capability('mod/lti:view', $context);
$lti->cmid = $cm->id;
list($endpoint, $parms) = lti_get_launch_data($lti);
$parameters = array();
foreach ($parms as $name => $value) {
$parameters[] = array('name' => $name, 'value' => $value);
}
$result = array();
$result['endpoint'] = $endpoint;
$result['parameters'] = $parameters;
$result['warnings'] = $warnings;
return $result;
}
/**
* Launch an external tool activity.
*
* @param stdClass $instance the external tool activity settings
* @return string The HTML code containing the javascript code for the launch
*/
function lti_launch_tool($instance)
{
list($endpoint, $parms) = lti_get_launch_data($instance);
$debuglaunch = $instance->debuglaunch == 1;
$content = lti_post_launch_html($parms, $endpoint, $debuglaunch);
echo $content;
}
