JWT 如何添加自定义声明和解码声明

Question

我正在尝试检索我在创建令牌时所做的一些自定义声明。但是，我不确定我应该写什么来检索这些声明。

这是我的令牌创建函数

public String createToken(AuthenticationDTO Input)
{
    //Set issued at date
    DateTime issuedAt = DateTime.UtcNow;
    //set the time when it expires
    DateTime expires = DateTime.UtcNow.AddDays(7);

    //http://stackoverflow.com/questions/18223868/how-to-encrypt-jwt-security-token
    var tokenHandler = new JwtSecurityTokenHandler();

    //create a identity and add claims to the user which we want to log in
    ClaimsIdentity claimsIdentity = new ClaimsIdentity(new[]
    {
        new Claim("UserName", Input.UserName),
        new Claim("Email",Input.Email),
        new Claim("PhoneNumber",Input.PhoneNumber),
        new Claim("FirstName",Input.FirstName),
        new Claim("LastName",Input.LastName),
        new Claim("Id",Input.Id)
    });

    const string sec = HostConfig.SecurityKey;
    var now = DateTime.UtcNow;
    var securityKey = new SymmetricSecurityKey(System.Text.Encoding.Default.GetBytes(sec));
    var signingCredentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256Signature);


    //create the jwt
    var token =(JwtSecurityToken)
            tokenHandler.CreateJwtSecurityToken(issuer: HostConfig.Issuer, audience: HostConfig.Audience,
                subject: claimsIdentity, notBefore: issuedAt, expires: expires, signingCredentials: signingCredentials);
    var tokenString = tokenHandler.WriteToken(token);

    return tokenString;
}

我决定命名我自己的声明，而不是使用提供的标准声明。但是，我不知道如何检索它们。这是我目前拥有的：

public AuthenticationDTO DecodeToken(String Input)
{
    var key = Encoding.ASCII.GetBytes(HostConfig.SecurityKey);
    var handler = new JwtSecurityTokenHandler();
    var tokenSecure = handler.ReadToken(Input) as SecurityToken;
    var validations = new TokenValidationParameters
    {
        ValidateIssuerSigningKey = true,
        IssuerSigningKey = new SymmetricSecurityKey(key),
        ValidateIssuer = false,
        ValidateAudience = false
    };
    var claims = handler.ValidateToken(Input, validations, out tokenSecure);
    return null;
}

编辑：

我注意到我的索赔是这样来的

如何提取它们？

EDIT2：

添加了 AuthentcationDTO

public class AuthenticationDTO
{
    public String Id { get; set; }
    public String UserName { get; set; }
    public String Email { get; set; }
    public String FirstName { get; set; }
    public String LastName { get; set; }
    public String PhoneNumber { get; set; }
}

Answer 1

如果您想获得声明，即preferred_username，您可以从 ClaimsPrincipal 获得。

var user = User as ClaimsPrincipal;
string username = user.Claims.Where(c => c.Type == "preferred_username")
    .Select(x => x.Value).FirstOrDefault();

User 将来自Claims。对于那个写

using System.Security.Claims;

似乎User 并非在所有版本中都可用。获得索赔的另一种方法是类似的。

var prinicpal = (ClaimsPrincipal)Thread.CurrentPrincipal;
var email = prinicpal.Claims.Where(c => c.Type == ClaimTypes.Email)
    .Select(c => c.Value).SingleOrDefault();

为AuthenticationDTO分配所有值。

public AuthenticationDTO DecodeToken(String Input)
{
    var key = Encoding.ASCII.GetBytes(HostConfig.SecurityKey);
    var handler = new JwtSecurityTokenHandler();
    var tokenSecure = handler.ReadToken(Input) as SecurityToken;
    var validations = new TokenValidationParameters
    {
        ValidateIssuerSigningKey = true,
        IssuerSigningKey = new SymmetricSecurityKey(key),
        ValidateIssuer = false,
        ValidateAudience = false
    };
    var claims = handler.ValidateToken(Input, validations, out tokenSecure);
    var prinicpal = (ClaimsPrincipal)Thread.CurrentPrincipal;
    if (principal is ClaimsPrincipal claims)
    {
         return new ApplicationDTO
             {
                 Id = claims.Claims.FirstOrDefault(x => x.Type == "sub")?.Value ?? "",
                 UserName = claims.Claims.FirstOrDefault(x => x.Type == "preferred_username")?.Value ?? "",
                 Email = claims.Claims.FirstOrDefault(x => x.Type == "email")?.Value ?? ""
             };
    }
    return null;
}