str = key + url_encode(path) + ts

sgin = md5(S).toLowerCase()

import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.util.Objects;

public class AuthInterceptor implements HandlerInterceptor {
    private final String secretKey; // 從配置文件獲取密鑰，例如application.properties
    private final long maxClockSkew = 60 * 1000; // 時間窗口：60秒（允許客戶端與服務端的時間誤差）

    public AuthInterceptor(String secretKey) {
        this.secretKey = secretKey;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
        // 1. 校驗時間戳是否存在
        String ts = request.getHeader("ts");
        if (StringUtils.isEmpty(ts)) {
            response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
            response.setContentType("application/json");
            // 返回錯誤信息：缺少時間戳
            return false;
        }

        // 2. 校驗時間戳格式及有效性
        long ts;
        try {
            ts = Long.parseLong(ts );
        } catch (NumberFormatException e) {
            response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
            // 返回錯誤信息：時間戳格式錯誤
            return false;
        }
        long currentTime = System.currentTimeMillis();
        if (currentTime - ts > maxClockSkew|| ts - currentTime > maxClockSkew) {
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            // 返回錯誤信息：請求已過期
            return false;
        }

        // 3. 校驗簽名是否存在
        String sign= request.getHeader("sign");
        if (StringUtils.isEmpty(sign)) {
            response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
            // 返回錯誤信息：缺少簽名
            return false;
        }

        // 4. 構造原始簽名字符串并生成簽名
        String path = request.getRequestURI(); // 獲取路徑，例如"/api/v1/user"
        String encodedPath = URLEncoder.encode(path, StandardCharsets.UTF_8.toString())
                .replace("+", "%20") // 處理空格編碼差異（URLEncoder默認用+，此處統(tǒng)一為%20）
                .replace("%7E", "~"); // 保留波浪線~的原始格式
        String rawString = secretKey + encodedPath + tsHeader;

        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] digest = md.digest(rawString.getBytes(StandardCharsets.UTF_8));
            StringBuilder sb = new StringBuilder();
            for (byte b : digest) {
                sb.append(String.format("%02x", b)); // 轉換為小寫16進制字符串
            }
            String generatedSign = sb.toString();

            // 5. 對比簽名
            if (!generatedSign.equals(sign)) {
                response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
                // 返回錯誤信息：簽名校驗失敗
                return false;
            }
        } catch (Exception e) {
            response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
            return false;
        }

        return true; // 校驗通過，允許請求繼續(xù)
    }
}

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class WebConfig implements WebMvcConfigurer {
    private final String secretKey; // 從配置文件獲取密鑰，例如通過@Value注入

    public WebConfig(String secretKey) {
        this.secretKey = secretKey;
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        AuthInterceptor authInterceptor = new AuthInterceptor(secretKey);
        registry.addInterceptor(authInterceptor)
                .addPathPatterns("/api/v1/**") // 需要鑒權的接口路徑（如/api/v1下所有接口）
                .excludePathPatterns("/api/v1/public/**"); // 無需鑒權的公共接口（可選）
    }
}

# 密鑰（建議從環(huán)境變量或配置中心獲取，而非硬編碼）
auth.secret-key=your_secret_key_here

function generateSignature(key, path, ts) {
    const encodedPath = encodeURIComponent(path).replace(/[!'()*]/g, encodeURIComponent); // 嚴格編碼特殊字符
    const rawString = key + encodedPath + ts;
    const md5 = require('crypto-js/md5'); // 需要安裝crypto-js庫
    return md5(rawString).toString().toLowerCase();
}

// 示例調用
const key = 'your_secret_key';
const path = '/api/v1/user'; // 接口路徑
const ts = Date.now(); // 當前時間戳（13位）
const sign = generateSignature(key, path, ts);
console.log(sign); // 輸出簽名值