@EnableZuulProxy
@SpringBootApplication
public class GatewayApplication {

	public static void main(String[] args) {
		SpringApplication.run(GatewayApplication.class, args);
	}
}

@RestController
@RequestMapping("/user")
public class LoginController {

	@PostMapping("/login")
	public Result login(String username, String password, HttpServletResponse response) {
		
		
		if ("admin".equals(username) && "admin".equals(password)) {
			// 模拟生成 token，实际开发中 token 应存放在数据库或缓存中
			String token = "123456";
			Cookie cookie = new Cookie("token", token);
			cookie.setPath("/");
			cookie.setMaxAge(60 * 10);
			response.addCookie(cookie);
			
			return Result.success();
		}
		
		return Result.fail(401, "账号或密码错误");
	}
}

@EnableEurekaClient
@SpringBootApplication
public class UserServerApplication {

	public static void main(String[] args) {
		SpringApplication.run(UserServerApplication.class, args);
	}
}

@Component
public class AuthenticationFilter extends ZuulFilter {

	/**
	 * 是否开启过滤
	 */
	@Override
	public boolean shouldFilter() {
		RequestContext context = RequestContext.getCurrentContext();
        HttpServletRequest request = context.getRequest();
        
		boolean flag = request.getRequestURI().contains("/login");
		// 如果是登录请求不进行过滤
		if (flag) {
			System.out.println("========不执行 zuul 过滤方法=======");
		} else {
			System.out.println("========执行 zuul 过滤方法=======");
		}
		return !flag;
	}

	/**
	 * 过滤器执行内容
	 */
	@Override
	public Object run() throws ZuulException {
		
		RequestContext context = RequestContext.getCurrentContext();
        HttpServletRequest request = context.getRequest();
        String token = request.getParameter("token");
        // 此处模拟获取数据库或缓存中的 token
        String dbToken = "123456";
        // 此处简单检验 token
        if (token == null || "".equals(token) || !dbToken.equals(token)) {
        	context.setSendZuulResponse(false);
        	context.setResponseStatusCode(HttpStatus.UNAUTHORIZED.value());
        }
        
		return null;
	}

	/**
	 * 过滤器类型
	 */
	@Override
	public String filterType() {
		return "pre";
	}

	/**
	 * 过滤器执行顺序
	 */
	@Override
	public int filterOrder() {
		return 0;
	}

}