.NET core 8.0 token 验证

安装包 Microsoft.AspNetCore.Authentication.JwtBearer

在.net8.0 在program.cs 内添加 以下：

// token验证
builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme).AddJwtBearer(options =>
    options.TokenValidationParameters = new TokenValidationParameters()
    {
        ValidateIssuer = true,
        ValidIssuer =builder.Configuration["JWT:Issuer"],
        ValidateAudience = true,
        ValidAudience = builder.Configuration["JWT:Audience"],
        ValidateLifetime = true,
        IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(builder.Configuration["JWT:SecretKey"]))

    }

);

配置文件 appsetting.json：

 "JWT": {
    "SecretKey": "密钥自定义",
    "Issuer": "自定义",
    "Expires": 24,     //token过期时间
    "Audience": "自定义"
  }

在program.cs内添加

//开启认证
app.UseAuthentication();
//开启授权
app.UseAuthorization();

编写生成Token方法

需要下载 Microsoft.Extensions.Configuration包;

public class TokenCode
{
    private readonly IConfiguration Configuration;
    public TokenCode(IConfiguration Configuration)
    {
        this.Configuration = Configuration;
    }
    /// <summary>
    /// 生成token
    /// </summary>
    /// <param name="uid">用户的id</param>
    /// <returns>自己创建的类</returns>
    public LoginDTO CreateToken(string uid)
    {
        // 1. 定义需要使用到的Claims
        var claims = new[]
        {
            //把用户的id加密进去，使用的时候可以从token里解密拿出来
            new Claim("uid", uid),
            //也可以多传几个参数
            //new Claim("name", "Admin")
        };

        // 2. 从 appsettings.json 中读取SecretKey
        var secretKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(Configuration["JWT:SecretKey"]));
    
        // 3. 选择加密算法
        var algorithm = SecurityAlgorithms.HmacSha256;
    
        // 4. 生成Credentials
        var signingCredentials = new SigningCredentials(secretKey, algorithm);
    
        // 5. 从 appsettings.json 中读取Expires
        var expires = Convert.ToDouble(Configuration["JWT:Expires"]);
    
        // 6. 根据以上，生成token
        var token = new JwtSecurityToken(
            Configuration["JWT:Issuer"],     //Issuer
            Configuration["JWT:Audience"],   //Audience
            claims,                          //Claims,
            DateTime.Now,                    //notBefore
            DateTime.Now.AddHours(expires),  //expires token过期时间，这里我设置了24小时
            signingCredentials               //Credentials
        );
    
        // 7. 将token变为string
        var jwtToken = new JwtSecurityTokenHandler().WriteToken(token);
    
        return new LoginDTO
        {
            UID = uid,
            //LoginDTO是自定义的类，Expires我定义为unix时间戳类型，可以改成其他类型
            Expires = DateTime.Now.AddHours(expires),
            Token = jwtToken
        };
    
    }

}

从Token获取验证信息

  protected ValueTask<string> GetUserIdAsync()
    {
        //在Claim中填入的uid取出来
        var userId = HttpContext.User.Claims.FirstOrDefault(t => t.Type == "uid")?.Value ?? string.Empty;
        if (!string.IsNullOrWhiteSpace(userId))
        {
            return new ValueTask<string>(userId);
        }
        return new ValueTask<string>("-1");
    }

调用

string userId= await GetUserIdAsync();

那个控制器接口需要Token验证加上

[Authorize]