src/main/java/org/apache/pulsar/manager/interceptor/AdminHandlerInterceptor.java

/**
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.pulsar.manager.interceptor;

import com.google.common.collect.Maps;
import com.google.gson.Gson;
import org.apache.pulsar.manager.entity.EnvironmentEntity;
import org.apache.pulsar.manager.entity.EnvironmentsRepository;
import org.apache.pulsar.manager.entity.UserInfoEntity;
import org.apache.pulsar.manager.entity.UsersRepository;
import org.apache.pulsar.manager.service.JwtService;
import org.apache.pulsar.manager.service.PulsarEvent;
import org.apache.pulsar.manager.service.RolesService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.lang.Nullable;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.Optional;

@Component
public class AdminHandlerInterceptor extends HandlerInterceptorAdapter {

    private final JwtService jwtService;
    private final EnvironmentsRepository environmentsRepository;

    @Autowired
    public AdminHandlerInterceptor(JwtService jwtService, EnvironmentsRepository environmentsRepository) {
        this.jwtService = jwtService;
        this.environmentsRepository = environmentsRepository;
    }

    @Autowired
    private UsersRepository usersRepository;

    @Value("${user.management.enable}")
    private boolean userManagementEnable;

    @Autowired
    private RolesService rolesService;

    @Autowired
    private PulsarEvent pulsarEvent;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // allow frontend requests, in case of front-end running on the same process of backend

        if (request.getServletPath().startsWith("/ui")
                || request.getServletPath().startsWith("/static")) {
            return true;
        }
        String token = request.getHeader("token");
        String saveToken = jwtService.getToken(request.getSession().getId());
        Map<String, Object> map = Maps.newHashMap();
        Gson gson = new Gson();
        if (token == null || !token.equals(saveToken)) {
            map.put("message", "Please login.");
            response.setStatus(401);
            response.getWriter().append(gson.toJson(map));
            return false;
        }
        if (userManagementEnable) {
            Optional<UserInfoEntity> optionalUserInfoEntity = usersRepository.findByAccessToken(token);
            if (!optionalUserInfoEntity.isPresent()) {
                map.put("message", "Please login.");
                response.setStatus(401);
                response.getWriter().append(gson.toJson(map));
                return false;
            }
            String username = request.getHeader("username");
            UserInfoEntity userInfoEntity = optionalUserInfoEntity.get();
            if (!userInfoEntity.getName().equals(username)) {
                map.put("message", "Please login.");
                response.setStatus(401);
                response.getWriter().append(gson.toJson(map));
                return false;
            }
        }
        String requestUri = request.getServletPath();
        if (!requestUri.equals("/pulsar-manager/users/userInfo")) {
            String environment = request.getHeader("environment");
            Optional<EnvironmentEntity> environmentEntityOptional = environmentsRepository.findByName(environment);
            if (!request.getServletPath().startsWith("/pulsar-manager/environments") && !environmentEntityOptional.isPresent()) {
                map.put("message", "Currently there is no active environment, please set one");
                response.setStatus(400);
                response.getWriter().append(gson.toJson(map));
                return false;
            }
        }
        if (!rolesService.isSuperUser(token)) {
            if (requestUri.startsWith("/admin/v2/clusters")
                    || requestUri.startsWith("/admin/v2/brokers")) {
                map.put("message", "This user no permissions for this resource");
                response.setStatus(401);
                response.getWriter().append(gson.toJson(map));
                return false;
            }
            if (requestUri.startsWith("/admin/v2/tenants")) {
                if (request.getMethod() != "GET") {
                    map.put("message", "This user no permissions for this resource");
                    response.setStatus(401);
                    response.getWriter().append(gson.toJson(map));
                    return false;
                }
            }
            if (requestUri.startsWith("/pulsar-manager/admin/v2/namespaces")
                    || requestUri.startsWith("/pulsar-manager/admin/v2/persistent")
                    || requestUri.startsWith("/pulsar-manager/admin/v2/non-persistent")) {
                Map<String, String> result = pulsarEvent.validateTenantPermission(requestUri, token);
                if (result.get("error") != null) {
                    map.put("message", result.get("error"));
                    response.setStatus(401);
                    response.getWriter().append(gson.toJson(map));
                    return false;
                }
            }
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                           @Nullable ModelAndView modelAndView) throws Exception {
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
            throws Exception {}

}