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/*
 * Licensed to Laurent Broudoux (the "Author") under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Author licenses this
 * file to you 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 io.github.microcks.security;

import org.keycloak.KeycloakSecurityContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * A Spring Web HandlerInterceptor that checks if @EnabledUserInfoInContext annotation is present on controller method
 * in order to inject UserInfo as a HTTP request attribute.
 * @author laurent
 */
public class UserInfoInContextInterceptor implements HandlerInterceptor  {

   /** A simple logger for diagnostic messages. */
   private static Logger log = LoggerFactory.getLogger(UserInfoInContextInterceptor.class);

   @Override
   public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
      log.debug("Intercepting and pre-handling request to check @EnableUserInfoInContext");
      if (handler instanceof HandlerMethod) {
         EnableUserInfoInContext needUserInfo = ((HandlerMethod) handler).getMethodAnnotation(EnableUserInfoInContext.class);
         if (needUserInfo == null) {
            needUserInfo = ((HandlerMethod) handler).getMethod().getDeclaringClass().getAnnotation(EnableUserInfoInContext.class);
         }

         // We're sure we do not need to inject UserInfo in context, so xew can proceed.
         if (needUserInfo == null) {
            return true;
         }

         log.debug("@EnableUserInfoInContext is present on {}", handler);
         Object ksc = request.getAttribute(KeycloakSecurityContext.class.getName());
         if (ksc != null) {
            log.debug("Found a KeycloakSecurityContext to map to UserInfo");
            KeycloakSecurityContext context = KeycloakSecurityContext.class.cast(ksc);

            // Create and store UserInfo in request attribute.
            UserInfo userInfo = KeycloakTokenToUserInfoMapper.map(context);
            request.setAttribute(UserInfo.class.getName(), userInfo);
         }
      }
      return HandlerInterceptor.super.preHandle(request, response, handler);
   }
}