I don't know how to extract the id of principal

Question

I have this code ant I want to extract the UUID of principal and give it as a parameter in the saveProperty function. But I don't know how. Can someone help me?

    public String saveProperty(@ModelAttribute("property") Property property, Principal principal) {
        //UUID userUUID= principal.getId();
        propertyService.saveProperty(property, userUUID);
        //propertyService.saveProperty(property, UUID.randomUUID());
        return "redirect:/properties";
    }

Answer 1

You would implement the UserDetailsService interface and the UserDetails interface in another class as in this reference, you can get your model containing id in your controller class like this:

public String saveProperty(@ModelAttribute("property") Property property, 
                           Authentication authentication) {
    CustomUser customUser = (CustomUser)authentication.getPrincipal();
    UUID userUUID = customUser.getId();
    propertyService.saveProperty(property, userUUID);
    return "redirect:/properties";
}

OR

public String saveProperty(@ModelAttribute("property") Property property, 
                           @AuthenticationPrincipal CustomUser customUser) {
    UUID userUUID = customUser.getId();
    propertyService.saveProperty(property, userUUID);
    return "redirect:/properties";
}