/// <summary>
/// 获取JWT字符串并存入缓存
/// </summary>
/// <param name="tm"></param>
/// <param name="expireSliding"></param>
/// <param name="expireAbsoulte"></param>
/// <returns></returns>
public static string IssueJWT(TokenModel tokenModel, TimeSpan expiresSliding, TimeSpan expiresAbsoulte)
{
DateTime UTC = DateTime.UtcNow;
Claim[] claims = new Claim[]
{
new Claim(JwtRegisteredClaimNames.Sub, tokenModel.Sub), //Subject,
new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString()), //JWT ID,JWT的唯一标识
new Claim(JwtRegisteredClaimNames.Iat, UTC.ToString(), ClaimValueTypes.Integer64), //Issued At，JWT颁发的时间，采用标准unix时间，用于验证过期
};
JwtSecurityToken jwt = new JwtSecurityToken(
issuer: "Api", //jwt签发者,非必须，自定义
audience: tokenModel.Uname, //jwt的接收该方，非必须
claims: claims, //声明集合
expires: UTC.AddHours(12), //指定token的生命周期，unix时间戳格式,非必须
signingCredentials: new Microsoft.IdentityModel.Tokens
.SigningCredentials(new SymmetricSecurityKey(Encoding.ASCII.GetBytes("Blog.Core's Secret Key")), SecurityAlgorithms.HmacSha256));
var encodedJwt = new JwtSecurityTokenHandler().WriteToken(jwt);
RayPIMemoryCache.AddMemoryCache(encodedJwt, tokenModel, expiresSliding, expiresAbsoulte); //将JWT字符串，令牌实体，存入缓存
return(encodedJwt);
}
