src/main/java/com/juick/www/VisitorArgumentResolver.java


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/*
 * Copyright (C) 2008-2023, Juick
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.juick.www;

import com.juick.model.AnonymousUser;
import com.juick.model.User;
import com.juick.service.UserService;
import com.juick.service.security.entities.JuickUser;
import org.springframework.core.MethodParameter;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.oauth2.jwt.Jwt;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;

import javax.inject.Inject;

public class VisitorArgumentResolver implements HandlerMethodArgumentResolver {
    private final UserService userService;
    public VisitorArgumentResolver(UserService userService) {
        this.userService = userService;
    }
    @Override
    public boolean supportsParameter(MethodParameter parameter) {
        return parameter.getParameterType().equals(User.class);
    }

    @Override
    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer,
                                  NativeWebRequest webRequest, WebDataBinderFactory binderFactory) {
        var principal = SecurityContextHolder.getContext().getAuthentication().getPrincipal();
        if (principal != null) {
            if (principal instanceof JuickUser) {
                return ((JuickUser) principal).getUser();
            }
            if (principal instanceof Jwt) {
                var uname = (String) ((Jwt) principal).getClaims().get("sub");
                return userService.getUserByName(uname);
            }
        }
        return AnonymousUser.INSTANCE;
    }
}