41 lines
1.8 KiB
C#
41 lines
1.8 KiB
C#
using System.Security.Cryptography;
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using System.Text;
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namespace Common.Notify
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{
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/// <summary>
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/// IM 机器人 Webhook 加签工具（钉钉/飞书）
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/// 供 IOT_API 直连推送与 AlertBridge 跨网转发程序共用，保证两种模式签名算法一致
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/// </summary>
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public static class ImWebhookSigner
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{
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/// <summary>
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/// 钉钉机器人加签：sign = UrlEncode(Base64(HmacSHA256(timestamp + "\n" + secret, key=secret)))
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/// </summary>
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/// <param name="timestampMs">毫秒时间戳</param>
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/// <param name="secret">加签密钥（SEC 开头）</param>
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/// <returns>URL 编码后的签名</returns>
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public static string DingTalkSign(long timestampMs, string secret)
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{
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string stringToSign = $"{timestampMs}\n{secret}";
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using var hmac = new HMACSHA256(Encoding.UTF8.GetBytes(secret));
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byte[] signData = hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign));
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return Uri.EscapeDataString(Convert.ToBase64String(signData));
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}
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/// <summary>
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/// 飞书机器人加签：sign = Base64(HmacSHA256(空串, key=timestamp + "\n" + secret))
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/// 注意与钉钉相反：飞书以"时间戳\n密钥"为 key、对空内容签名
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/// </summary>
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/// <param name="timestampSec">秒级时间戳</param>
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/// <param name="secret">加签密钥</param>
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/// <returns>Base64 签名</returns>
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public static string FeishuSign(long timestampSec, string secret)
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{
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using var hmac = new HMACSHA256(Encoding.UTF8.GetBytes($"{timestampSec}\n{secret}"));
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byte[] signData = hmac.ComputeHash(Array.Empty<byte>());
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return Convert.ToBase64String(signData);
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}
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}
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}
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