88 lines
3.0 KiB
C#
88 lines
3.0 KiB
C#
using System;
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using System.Buffers.Text;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using YuanXuan.IM.Common.Exceptions;
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using YuanXuan.IM.Common.Helpers;
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using YuanXuan.IM.Infrastructure.Redis;
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namespace YuanXuan.IM.Api.Helper
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{
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/// <summary>
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/// 手机跳H5用户签名帮助类
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/// </summary>
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public static class MobileToH5UserSign
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{
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/// <summary>
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/// 获取用户跳转H5的签名，并缓存sign 1小时
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/// </summary>
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/// <param name="UserId"></param>
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/// <param name="DataId"></param>
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/// <returns></returns>
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public static string GetUserSign(string UserId, long? DataId)
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{
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//生成sign，规则为：Id + "&" + userId
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var sign = $"{UserId}";
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if (DataId != null)
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{
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sign = $"{DataId}&" + sign;
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}
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//aes加密sign
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sign = AesEncryptHelper.EncryptToShortString(sign);
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//sign进行base64
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// 将字符串转换为字节数组
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byte[] byteArray = Encoding.UTF8.GetBytes(sign);
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// 将字节数组转换为Base64字符串
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string base64String = Convert.ToBase64String(byteArray);
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//存储到redis中，有效期1小时
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RedisHelper.Instance.Set(base64String, $"{DataId}&{UserId}", TimeSpan.FromHours(1));
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return base64String;
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}
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/// <summary>
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/// 解密用户跳转H5的签名，获取Id（有可能为null）和userId
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/// </summary>
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/// <param name="sign"></param>
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/// <param name="parCount">正确参数个数</param>
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/// <returns></returns>
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/// <exception cref="Exception"></exception>
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public static (long? DataId, long UserId) DecryptUserSign(string sign, int parCount)
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{
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//判断redis中是否存在sign
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var redisSign = RedisHelper.Instance.Get(sign);
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if (string.IsNullOrEmpty(redisSign))
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{
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throw new BusinessException("链接已过期，请重新获取");
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}
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//sign的base64解码
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byte[] decodedBytes = Convert.FromBase64String(sign);
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// 转换为UTF8字符串
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string decodedString = Encoding.UTF8.GetString(decodedBytes);
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//解密sign
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sign = AesEncryptHelper.DecryptFromShortString(decodedString);
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var arr = sign.Split('&');
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if (parCount!=arr.Length)
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{
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throw new BusinessException("参数错误");
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}
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if (arr.Length == 1)
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{
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var userId = Convert.ToInt64(arr[0]);
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return (null, userId);
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}
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else if (true)
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{
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var id = Convert.ToInt64(arr[0]);
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var userId = Convert.ToInt64(arr[1]);
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return (id, userId);
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}
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else
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{
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throw new BusinessException("参数错误");
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}
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}
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}
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}
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