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using Microsoft.AspNetCore.Authentication;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Microsoft.IdentityModel.Tokens;
using Microsoft.Net.Http.Headers;
using System;
using System.IdentityModel.Tokens.Jwt;
using System.Text.Encodings.Web;
using System.Threading.Tasks;
namespace Timeline.Authenticate
{
static class AuthConstants
{
public const string Scheme = "Bearer";
public const string DisplayName = "My Jwt Auth Scheme";
}
class AuthOptions : AuthenticationSchemeOptions
{
/// <summary>
/// The query param key to search for token. If null then query params are not searched for token. Default to <c>"token"</c>.
/// </summary>
public string TokenQueryParamKey { get; set; } = "token";
public TokenValidationParameters TokenValidationParameters { get; set; } = new TokenValidationParameters();
}
class AuthHandler : AuthenticationHandler<AuthOptions>
{
private readonly ILogger<AuthHandler> _logger;
public AuthHandler(IOptionsMonitor<AuthOptions> options, ILoggerFactory logger, UrlEncoder encoder, ISystemClock clock)
: base(options, logger, encoder, clock)
{
_logger = logger.CreateLogger<AuthHandler>();
}
// return null if no token is found
private string ExtractToken()
{
// check the authorization header
string header = Request.Headers[HeaderNames.Authorization];
if (!string.IsNullOrEmpty(header) && header.StartsWith("Bearer ", StringComparison.OrdinalIgnoreCase))
{
var token = header.Substring("Bearer ".Length).Trim();
_logger.LogInformation("Token is found in authorization header. Token is {} .", token);
return token;
}
// check the query params
var paramQueryKey = Options.TokenQueryParamKey;
if (!string.IsNullOrEmpty(paramQueryKey))
{
string token = Request.Query[paramQueryKey];
if (!string.IsNullOrEmpty(token))
{
_logger.LogInformation("Token is found in query param with key \"{}\". Token is {} .", paramQueryKey, token);
return token;
}
}
// not found anywhere then return null
return null;
}
protected override async Task<AuthenticateResult> HandleAuthenticateAsync()
{
var token = ExtractToken();
if (string.IsNullOrEmpty(token))
{
_logger.LogInformation("No jwt token is found.");
return AuthenticateResult.NoResult();
}
var handler = new JwtSecurityTokenHandler();
try
{
var principal = handler.ValidateToken(token, Options.TokenValidationParameters, out var validatedToken);
return AuthenticateResult.Success(new AuthenticationTicket(principal, AuthConstants.Scheme));
}
catch (SecurityTokenException e)
{
_logger.LogInformation(e, "A jwt token validation failed.");
return AuthenticateResult.Fail(e);
}
catch (Exception e)
{
_logger.LogError(e, "Arguments passed to the JwtSecurityTokenHandler.ValidateToken are bad.");
throw e;
}
}
}
}
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