91 lines
4.3 KiB
C#
91 lines
4.3 KiB
C#
using Backend.Models;
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using Microsoft.Extensions.Configuration;
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using Microsoft.Extensions.Options;
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using Microsoft.IdentityModel.Tokens;
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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.Security.Claims;
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using System.Text;
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namespace Backend.Jwt
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{
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public interface IJwtHelpers
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{
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TnToken GenerateToken(JwtLogin login);
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}
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public class JwtHelpers: IJwtHelpers
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{
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private readonly IConfiguration _configuration;
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public JwtHelpers(IConfiguration configuration)
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{
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_configuration = configuration;
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}
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public TnToken GenerateToken(JwtLogin login)
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{
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var issuer = _configuration.GetValue<string>("JwtSettings:Issuer");
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var signKey = _configuration.GetValue<string>("JwtSettings:SignKey");
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var lifeseconds = _configuration.GetValue<int>("JwtSettings:JwtLifeSeconds");
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// 設定要加入到 JWT Token 中的聲明資訊(Claims)
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var claims = new List<Claim>();
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// 在 RFC 7519 規格中(Section#4)，總共定義了 7 個預設的 Claims，我們應該只用的到兩種！
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claims.Add(new Claim(JwtRegisteredClaimNames.Iss, issuer));
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//claims.Add(new Claim(JwtRegisteredClaimNames.NameId, login.CustomerNo.ToString()));
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//claims.Add(new Claim(JwtRegisteredClaimNames.Sub, login.Username)); // User.Identity.Name
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//claims.Add(new Claim(JwtRegisteredClaimNames.Aud, "The Audience"));
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//claims.Add(new Claim(JwtRegisteredClaimNames.Exp, DateTimeOffset.UtcNow.AddSeconds(expireSeconds).ToUnixTimeSeconds().ToString()));
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//claims.Add(new Claim(JwtRegisteredClaimNames.Nbf, DateTimeOffset.UtcNow.ToUnixTimeSeconds().ToString())); // 必須為數字
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//claims.Add(new Claim(JwtRegisteredClaimNames.Iat, DateTimeOffset.UtcNow.ToUnixTimeSeconds().ToString())); // 必須為數字
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//claims.Add(new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString())); // JWT ID
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// 網路上常看到的這個 NameId 設定是多餘的
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//claims.Add(new Claim(JwtRegisteredClaimNames.NameId, userName));
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// 這個 Claim 也以直接被 JwtRegisteredClaimNames.Sub 取代，所以也是多餘的
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//claims.Add(new Claim(ClaimTypes.Name, userName));
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// 你可以自行擴充 "roles" 加入登入者該有的角色
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//claims.Add(new Claim("roles", "Users"));
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//claims.Add(new Claim("groupid", login.AreaCode));
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claims.Add(new Claim("userinfo_guid", login.userinfo_guid));
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claims.Add(new Claim("account", login.account));
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claims.Add(new Claim("full_name", login.full_name));
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claims.Add(new Claim("email", login.email));
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var userClaimsIdentity = new ClaimsIdentity(claims);
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// 建立一組對稱式加密的金鑰，主要用於 JWT 簽章之用
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var securityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(signKey));
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// HmacSha256 有要求必須要大於 128 bits，所以 key 不能太短，至少要 16 字元以上
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// https://stackoverflow.com/questions/47279947/idx10603-the-algorithm-hs256-requires-the-securitykey-keysize-to-be-greater
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var signingCredentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256Signature);
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var now = DateTime.Now;
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var expires = DateTime.Now.AddSeconds(lifeseconds);
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// 產出所需要的 JWT securityToken 物件，並取得序列化後的 Token 結果(字串格式)
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var tokenHandler = new JwtSecurityTokenHandler();
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var jst = new JwtSecurityToken(
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issuer: issuer,//Token釋出者
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//audience: _options.Value.Audience,//Token接受者
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claims: claims,//攜帶的負載
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notBefore: now,//當前時間token生成時間
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expires: expires,//過期時間
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signingCredentials: signingCredentials
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);
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var serializeToken = tokenHandler.WriteToken(jst);
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var data = new TnToken();
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data.token = serializeToken;
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data.type = "bearer";
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data.expires= lifeseconds;
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return data;
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}
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}
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}
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