Backend/C_shape/WEBAPI/JWT/JWTdemo/Authorization/JwtUtils.cs

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2024-05-06 14:09:39 +08:00
namespace JWTdemo.Authorization;
using Microsoft.Extensions.Options;
using Microsoft.IdentityModel.Tokens;
using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using System.Text;
using JWTdemo.Entities;
using JWTdemo.Helpers;
public interface IJwtUtils
{
public string GenerateJwtToken(User user);
public int? ValidateJwtToken(string? token);
}
public class JwtUtils : IJwtUtils
{
private readonly AppSettings _appSettings;
public JwtUtils(IOptions<AppSettings> appSettings)
{
_appSettings = appSettings.Value;
if (string.IsNullOrEmpty(_appSettings.Secret))
throw new Exception("JWT secret not configured");
}
public string GenerateJwtToken(User user)
{
// generate token that is valid for 7 days
var tokenHandler = new JwtSecurityTokenHandler(); //實例化JWT令牌
var key = Encoding.ASCII.GetBytes(_appSettings.Secret!); //從配置中獲取應用程序密鑰,用於簽名令牌以確保其完整性和安全性
var tokenDescriptor = new SecurityTokenDescriptor //定義令牌格式其包含header(SigningCredentials).payload(expires和subject).signature(簽在header裡面)
{
Subject = new ClaimsIdentity(new[] { new Claim("id", user.Id.ToString()) }), //payload
Expires = DateTime.UtcNow.AddDays(7), //payload令牌過期時間
SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(key), SecurityAlgorithms.HmacSha256Signature) //header
};
var token = tokenHandler.CreateToken(tokenDescriptor); //創建JWT令牌
return tokenHandler.WriteToken(token); //將JWT令牌轉為base64編碼
}
public int? ValidateJwtToken(string? token)
{
if (token == null)
return null;
var tokenHandler = new JwtSecurityTokenHandler();
var key = Encoding.ASCII.GetBytes(_appSettings.Secret!);
try
{
tokenHandler.ValidateToken(token, new TokenValidationParameters
{
ValidateIssuerSigningKey = true,
IssuerSigningKey = new SymmetricSecurityKey(key),
ValidateIssuer = false,
ValidateAudience = false,
// set clockskew to zero so tokens expire exactly at token expiration time (instead of 5 minutes later)
ClockSkew = TimeSpan.Zero
}, out SecurityToken validatedToken);
var jwtToken = (JwtSecurityToken)validatedToken;
var userId = int.Parse(jwtToken.Claims.First(x => x.Type == "id").Value);
// return user id from JWT token if validation successful
return userId;
}
catch
{
// return null if validation fails
return null;
}
}
//0523
public bool ValidateToken(string token)
{
var tokenHandler = new JwtSecurityTokenHandler();
var jwtSecret = "your_jwt_secret"; // JWT 密钥,应与生成令牌时使用的密钥相匹配
var validationParameters = new TokenValidationParameters
{
ValidateIssuerSigningKey = true,
IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(jwtSecret)),
ValidateIssuer = false,
ValidateAudience = false,
ValidateLifetime = true,
ClockSkew = TimeSpan.Zero // 设置为零以确保令牌过期时立即失效
};
try
{
SecurityToken validatedToken;
tokenHandler.ValidateToken(token, validationParameters, out validatedToken);
return true;
}
catch
{
return false;
}
}
}