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/***********************************************************************
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* Project: CoreCms
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* ProjectName: 核心内容管理系统
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* Web: https://www.corecms.net
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* Author: 大灰灰
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* Email: jianweie@163.com
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* CreateTime: 2021/1/31 21:45:10
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* Description: 暂无
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***********************************************************************/
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using System;
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using System.Collections.Generic;
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using System.IdentityModel.Tokens.Jwt;
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using System.Linq;
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using System.Security.Claims;
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using System.Text;
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using System.Threading.Tasks;
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using CoreCms.Net.Configuration;
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using Microsoft.IdentityModel.Tokens;
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namespace CoreCms.Net.Auth
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{
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public class TokenHelper
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{
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/// <summary>
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/// Use the below code to generate symmetric Secret Key
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/// var hmac = new HMACSHA256();
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/// var key = Convert.ToBase64String(hmac.Key);
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/// </summary>
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private const string Secret = "db3OIsj+BXE9NZDy0t8W3TcNekrF+2d/1sFnWG4HnV8TZY30iTOdtVWJG8abWvB1GlOgJuQZdcF2Luqm/hccMw==";
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public static string GenerateToken(string username, int expireMinutes = 120)
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{ // 此方法用来生成 Token
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var symmetricKey = Convert.FromBase64String(Secret); // 生成二进制字节数组
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var tokenHandler = new JwtSecurityTokenHandler(); // 创建一个JwtSecurityTokenHandler类用来生成Token
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var now = DateTime.UtcNow; // 获取当前时间
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var tokenDescriptor = new SecurityTokenDescriptor // 创建一个 Token 的原始对象
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{
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Subject = new ClaimsIdentity(new[] // Token的身份证,类似一个人可以有身份证,户口本
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{
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new Claim(ClaimTypes.Name, username) // 可以创建多个
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}),
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Expires = now.AddMinutes(Convert.ToInt32(expireMinutes)), // Token 有效期
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SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(symmetricKey), SecurityAlgorithms.HmacSha256)
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// 生成一个Token证书,第一个参数是根据预先的二进制字节数组生成一个安全秘钥,说白了就是密码,第二个参数是编码方式
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};
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var stoken = tokenHandler.CreateToken(tokenDescriptor); // 生成一个编码后的token对象实例
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var token = tokenHandler.WriteToken(stoken); // 生成token字符串,给前端使用
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return token;
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}
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public static ClaimsPrincipal GetPrincipal(string token)
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{ // 此方法用解码字符串token,并返回秘钥的信息对象
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try
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{
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var tokenHandler = new JwtSecurityTokenHandler(); // 创建一个JwtSecurityTokenHandler类,用来后续操作
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var jwtToken = tokenHandler.ReadToken(token) as JwtSecurityToken; // 将字符串token解码成token对象
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if (jwtToken == null)
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return null;
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var symmetricKey = Convert.FromBase64String(Secret); // 生成编码对应的字节数组
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var validationParameters = new TokenValidationParameters() // 生成验证token的参数
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{
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RequireExpirationTime = true, // token是否包含有效期
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ValidateIssuer = false, // 验证秘钥发行人,如果要验证在这里指定发行人字符串即可
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ValidateAudience = false, // 验证秘钥的接受人,如果要验证在这里提供接收人字符串即可
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IssuerSigningKey = new SymmetricSecurityKey(symmetricKey) // 生成token时的安全秘钥
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};
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SecurityToken securityToken; // 接受解码后的token对象
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var principal = tokenHandler.ValidateToken(token, validationParameters, out securityToken);
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return principal; // 返回秘钥的主体对象,包含秘钥的所有相关信息
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}
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catch
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{
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return null;
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}
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}
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/// <summary>
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/// 此方法用解码字符串token,并返回秘钥的信息对象
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/// </summary>
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/// <param name="token"></param>
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/// <returns></returns>
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public static int GetUserIdBySecurityToken(string token)
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{
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//读取配置文件
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var symmetricKeyAsBase64 = AppSettingsConstVars.JwtConfigSecretKey;
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var keyByteArray = Encoding.ASCII.GetBytes(symmetricKeyAsBase64);
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var signingKey = new SymmetricSecurityKey(keyByteArray);
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var issuer = AppSettingsConstVars.JwtConfigIssuer;
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var audience = AppSettingsConstVars.JwtConfigAudience;
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try
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{
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var tokenHandler = new JwtSecurityTokenHandler(); // 创建一个JwtSecurityTokenHandler类,用来后续操作
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var jwtToken = tokenHandler.ReadToken(token) as JwtSecurityToken; // 将字符串token解码成token对象
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if (jwtToken == null)
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return 0;
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var validationParameters = new TokenValidationParameters() // 生成验证token的参数
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{
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ValidateIssuerSigningKey = true, //是否验证SecurityKey
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IssuerSigningKey = signingKey, //拿到SecurityKey
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ValidateIssuer = true, //是否验证Issuer
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ValidIssuer = issuer,//发行人 //Issuer,这两项和前面签发jwt的设置一致
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ValidateAudience = true, //是否验证Audience
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ValidAudience = audience,//订阅人
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ValidateLifetime = true,//是否验证失效时间
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ClockSkew = TimeSpan.FromSeconds(60),
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RequireExpirationTime = true,
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};
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SecurityToken securityToken; // 接受解码后的token对象
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var principal = tokenHandler.ValidateToken(token, validationParameters, out securityToken);
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if (securityToken == null || string.IsNullOrEmpty(securityToken.Id))
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{
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return 0;
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}
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return Convert.ToInt32(securityToken.Id); // 返回秘钥的主体对象,包含秘钥的所有相关信息
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}
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catch
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{
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return 0;
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}
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}
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}
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}
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