74 lines
2.8 KiB
C#
74 lines
2.8 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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namespace YD_WeChatApplet.Commons.Utils
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{
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public static class SaTokenSignHelper
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{
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/// <summary>
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/// 根据业务参数生成 Java Sa-Token Sign 兼容的 QueryString
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/// 自动生成 timestamp 和 nonce，如果外部未提供
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/// </summary>
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/// <param name="paramMap">业务参数字典（可包含 teacherNo 等）</param>
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/// <param name="secretKey">应用密钥</param>
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/// <param name="channel">应用编码，例如 sk-yuedong</param>
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/// <returns>带 sign 的完整 QueryString</returns>
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public static string BuildQueryString(Dictionary<string, object> paramMap, string secretKey)
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{
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if (paramMap == null)
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paramMap = new Dictionary<string, object>();
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// 1️⃣ TreeMap 排序（ASCII 升序）
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var sorted = new SortedDictionary<string, string>(StringComparer.Ordinal);
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foreach (var kv in paramMap)
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sorted[kv.Key] = kv.Value.ToString();
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// 2️⃣ 拼接签名字符串 k=v&k=v&...&key=secretKey
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var sbSign = new StringBuilder();
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foreach (var kv in sorted)
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sbSign.Append(kv.Key).Append("=").Append(kv.Value).Append("&");
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sbSign.Append("key=").Append(secretKey.Trim());
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string sign = Md5(sbSign.ToString());
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// 3️⃣ 拼接 QueryString（保留外部字典原顺序）
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var sbQuery = new StringBuilder();
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foreach (var kv in paramMap)
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sbQuery.Append(Uri.EscapeDataString(kv.Key))
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.Append("=")
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.Append(Uri.EscapeDataString(kv.Value.ToString()))
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.Append("&");
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sbQuery.Append("sign=").Append(sign);
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return sbQuery.ToString();
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}
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/// <summary>
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/// MD5 小写 32 位
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/// </summary>
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private static string Md5(string input)
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{
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using var md5 = MD5.Create();
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var bytes = md5.ComputeHash(Encoding.UTF8.GetBytes(input));
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var sb = new StringBuilder();
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foreach (var b in bytes)
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sb.Append(b.ToString("x2"));
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return sb.ToString();
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}
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/// <summary>
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/// 生成随机字符串 nonce，可指定长度
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/// </summary>
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public static string RandomString(int length = 20)
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{
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const string chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
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var random = new Random();
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return new string(Enumerable.Repeat(chars, length).Select(s => s[random.Next(s.Length)]).ToArray());
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}
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}
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}
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