public async Task <IActionResult> RefreshToken(RefreshTokenRequest request)
{
var(accessToken, refreshToken) = (request.AccessToken, request.RefreshToken);
var tokenIsValid = ValidateToken(accessToken);
if (!tokenIsValid)
{
throw new BadRequestException("The token is not valid");
}
var claimsPrincipal = GetTokenClaimsPrincipal(request.AccessToken);
var expiryDateUnix = long.Parse(claimsPrincipal.Claims.Single(c => c.Type == JwtRegisteredClaimNames.Exp).Value);
var expiryDateUtc = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc).AddSeconds(expiryDateUnix);
var tokenHasExpired = DateTime.UtcNow > expiryDateUtc;
if (!tokenHasExpired)
{
throw new BadRequestException("The token has not expired yet");
}
var userRefreshToken = _dbContext.RefreshTokens.SingleOrDefault(r => r.RefreshTokenValue == refreshToken);
if (userRefreshToken == null)
{
throw new BadRequestException("The refresh token does not exists");
}
var refreshTokenHasExpired = DateTime.UtcNow > userRefreshToken.ExpiryDate;
if (refreshTokenHasExpired)
{
throw new BadRequestException("The refresh token has expired");
}
if (userRefreshToken.Invalidated)
{
throw new BadRequestException("The refresh token has been invalidated");
}
var jtiClaimValue = claimsPrincipal.Claims.Single(c => c.Type == JwtRegisteredClaimNames.Jti).Value;
var refreshTokenMatchWithTheAccessToken = jtiClaimValue == userRefreshToken.JwtId;
if (!refreshTokenMatchWithTheAccessToken)
{
throw new BadRequestException("The refresh token does not match with the provided access token");
}
if (userRefreshToken.Used)
{
throw new BadRequestException("The refresh token has already been used");
}
userRefreshToken.Used = true;
_dbContext.RefreshTokens.Update(userRefreshToken);
await _dbContext.SaveChangesAsync();
var userId = claimsPrincipal.Claims.Single(c => c.Type == "id").Value;
var user = await _userManager.FindByIdAsync(userId);
return(GenerateUserAccessTokenAndRefreshToken(user));
}