package cn.mb.cloud.auth.security.handler;

import cn.hutool.core.map.MapUtil;
import cn.hutool.core.util.CharsetUtil;
import cn.mb.cloud.auth.security.util.AuthUtils;
import cn.mb.cloud.common.core.util.ResponseData;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.Builder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.core.Authentication;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.oauth2.common.OAuth2AccessToken;
import org.springframework.security.oauth2.common.exceptions.InvalidClientException;
import org.springframework.security.oauth2.common.exceptions.UnapprovedClientAuthenticationException;
import org.springframework.security.oauth2.provider.*;
import org.springframework.security.oauth2.provider.request.DefaultOAuth2RequestValidator;
import org.springframework.security.oauth2.provider.token.AuthorizationServerTokenServices;
import org.springframework.security.web.authentication.AuthenticationSuccessHandler;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * @author jason
 * 手机号登录成功，返回oauth token
 */
@Slf4j
@Builder
public class MobileLoginSuccessHandler implements AuthenticationSuccessHandler {
    private static final String BASIC_ = "Basic ";
    private ObjectMapper objectMapper;
    private PasswordEncoder passwordEncoder;
    private ClientDetailsService clientDetailsService;
    private AuthorizationServerTokenServices defaultAuthorizationServerTokenServices;

    /**
     * Called when a user has been successfully authenticated.
     * 调用spring security oauth API 生成 oAuth2AccessToken
     *
     * @param request        the request which caused the successful authentication
     * @param response       the response
     * @param authentication the <tt>Authentication</tt> object which was created during
     */
    @Override
    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication) {
        String header = request.getHeader(HttpHeaders.AUTHORIZATION);

        if (header == null || !header.startsWith(BASIC_)) {
            throw new UnapprovedClientAuthenticationException("请求头中client信息为空");
        }

        try {
            String[] tokens = AuthUtils.extractAndDecodeHeader(header);
            assert tokens.length == 2;
            String clientId = tokens[0];

            ClientDetails clientDetails = clientDetailsService.loadClientByClientId(clientId);

            //校验secret
            if (!passwordEncoder.matches(tokens[1], clientDetails.getClientSecret())) {
                throw new InvalidClientException("Given client ID does not match authenticated client");

            }

            TokenRequest tokenRequest = new TokenRequest(MapUtil.newHashMap(), clientId, clientDetails.getScope(), "mobile");

            //校验scope
            new DefaultOAuth2RequestValidator().validateScope(tokenRequest, clientDetails);
            OAuth2Request oAuth2Request = tokenRequest.createOAuth2Request(clientDetails);
            OAuth2Authentication oAuth2Authentication = new OAuth2Authentication(oAuth2Request, authentication);
            OAuth2AccessToken oAuth2AccessToken = defaultAuthorizationServerTokenServices.createAccessToken(oAuth2Authentication);
            log.info("获取token 成功：{}", oAuth2AccessToken.getValue());

            response.setCharacterEncoding(CharsetUtil.UTF_8);
            response.setContentType(MediaType.APPLICATION_JSON_UTF8_VALUE);
            PrintWriter printWriter = response.getWriter();
            printWriter.append(objectMapper.writeValueAsString(ResponseData.success(oAuth2AccessToken)));
        } catch (IOException e) {
            throw new BadCredentialsException(
                    "Failed to decode basic authentication token");
        }

    }


}