package com.baiyue.lastleg.security;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ResponseStatusException;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;

@Component
public class InternalServiceTokenGuard {
    private final String expectedToken;
    public InternalServiceTokenGuard(@Value("${baiyue.security.internal-service-token:}") String expectedToken) { this.expectedToken=expectedToken; }
    public void verify(String actualToken) {
        if(expectedToken==null||expectedToken.isBlank()) throw new ResponseStatusException(HttpStatus.SERVICE_UNAVAILABLE,"内部事件接收令牌未配置");
        byte[] expected=expectedToken.getBytes(StandardCharsets.UTF_8);
        byte[] actual=actualToken==null?new byte[0]:actualToken.getBytes(StandardCharsets.UTF_8);
        if(!MessageDigest.isEqual(expected,actual)) throw new ResponseStatusException(HttpStatus.UNAUTHORIZED,"内部服务令牌无效");
    }
}