/*
 * Copyright 2025 Apollo Authors
 *
 * 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 com.ctrip.framework.apollo.portal.filter;

import com.ctrip.framework.apollo.portal.component.UserIdentityContextHolder;
import com.ctrip.framework.apollo.portal.constant.UserIdentityConstants;

import java.io.IOException;
import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import org.springframework.security.authentication.AnonymousAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.web.filter.OncePerRequestFilter;

import static com.ctrip.framework.apollo.openapi.util.ConsumerAuthUtil.CONSUMER_ID;
import static com.ctrip.framework.apollo.portal.util.UserTokenAuthUtil.USER_TOKEN;

public class UserTypeResolverFilter extends OncePerRequestFilter {
  @Override
  protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,
      FilterChain filterChain) throws ServletException, IOException {

    String authType = resolve(request);
    UserIdentityContextHolder.setAuthType(authType);
    try {
      filterChain.doFilter(request, response);
    } finally {
      UserIdentityContextHolder.clear();
    }
  }

  private String resolve(HttpServletRequest req) {
    if (req.getAttribute(USER_TOKEN) != null) {
      return UserIdentityConstants.USER_TOKEN;
    }

    if (req.getAttribute(CONSUMER_ID) != null) {
      return UserIdentityConstants.CONSUMER;
    }

    Authentication auth = SecurityContextHolder.getContext().getAuthentication();
    if (auth != null && auth.isAuthenticated() && !(auth instanceof AnonymousAuthenticationToken)) {
      return UserIdentityConstants.USER;
    }

    return UserIdentityConstants.ANONYMOUS;
  }
}
