public String favorite(Extension ex, String user)
{
String pluginKey = ex.getKey();
data.favorite(pluginKey, user);
sendFavoritedEmail(ex, user);
eventPublisher.publish(new ExtensionFavoritedEvent(pluginKey)
.setUserName(user)
.setUserEmail(userManager.getUserProfile(user).getEmail()));
return pluginKey;
}