/**
* Prevent downgrades to Kunena 1.7 and older releases
*/
public function onExtensionBeforeUpdate($type, $manifest)
{
if ($type != 'component') {
return true;
}
// Generate component name
$name = strtolower(JFilterInput::getInstance()->clean((string) $manifest->name, 'cmd'));
$element = substr($name, 0, 4) == "com_" ? $name : "com_{$name}";
if ($element != 'com_kunena') {
return true;
}
// Kunena 2.0.0-BETA2 and later support this feature in their installer
if (version_compare($manifest->version, '2.0.0', '>=')) {
return true;
}
// Check if we can downgrade to the current version
if (class_exists('KunenaInstaller') && KunenaInstaller::canDowngrade($manifest->version)) {
return true;
}
// Old version detected: emulate failed installation
$app = JFactory::getApplication();
$app->enqueueMessage(sprintf('Sorry, it is not possible to downgrade Kunena %s to version %s.', KunenaForum::version(), $manifest->version), 'warning');
$app->enqueueMessage(JText::_('JLIB_INSTALLER_ABORT_COMP_INSTALL_CUSTOM_INSTALL_FAILURE'), 'error');
$app->enqueueMessage(JText::sprintf('COM_INSTALLER_MSG_UPDATE_ERROR', JText::_('COM_INSTALLER_TYPE_TYPE_' . strtoupper($type))));
$app->redirect('index.php?option=com_installer');
return true;
}
protected function checkKunena($version)
{
$app = JFactory::getApplication();
// Always load Kunena API if it exists.
$api = JPATH_ADMINISTRATOR . '/components/com_kunena/api.php';
if (file_exists($api)) {
require_once $api;
}
// Do not install over Git repository (K1.6+).
if (class_exists('Kunena') && method_exists('Kunena', 'isSvn') && Kunena::isSvn() || class_exists('KunenaForum') && method_exists('KunenaForum', 'isDev') && KunenaForum::isDev()) {
$app->enqueueMessage('Oops! You should not install Kunena over your Git reporitory!', 'notice');
return false;
}
$db = JFactory::getDBO();
// Check if Kunena can be found from the database
$table = $db->getPrefix() . 'kunena_version';
$db->setQuery("SHOW TABLES LIKE {$db->quote($table)}");
if ($db->loadResult() != $table) {
return true;
}
// Get installed Kunena version
$db->setQuery("SELECT version FROM {$db->quoteName($table)} ORDER BY `id` DESC", 0, 1);
$installed = $db->loadResult();
if (!$installed) {
return true;
}
// Always allow upgrade to the newer version
if (version_compare($version, $installed, '>=')) {
return true;
}
// Check if we can downgrade to the current version
if (class_exists('KunenaInstaller')) {
if (KunenaInstaller::canDowngrade($version)) {
return true;
}
} else {
// Workaround when Kunena files were removed to allow downgrade between bugfix versions.
$major = preg_replace('/(\\d+.\\d+)\\..*$/', '\\1', $version);
if (version_compare($installed, $major, '>')) {
return true;
}
}
$app->enqueueMessage(sprintf('Sorry, it is not possible to downgrade Kunena %s to version %s.', $installed, $version), 'notice');
return false;
}