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using System;
using System.Net.Http.Headers;
using System.Security.Claims;
using System.Text;
using System.Text.Encodings.Web;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authentication;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;

namespace {{packageName}}.Security
{
    /// 
    /// class to handle bearer authentication.
    /// 
    public class BearerAuthenticationHandler : AuthenticationHandler
    {
        /// 
        /// scheme name for authentication handler.
        /// 
        public const string SchemeName = "Bearer";

        public BearerAuthenticationHandler(IOptionsMonitor options, ILoggerFactory logger, UrlEncoder encoder, ISystemClock clock) : base(options, logger, encoder, clock)
        {
        }

        /// 
        /// verify that require authorization header exists.
        /// 
        protected override async Task HandleAuthenticateAsync()
        {
            if (!Request.Headers.ContainsKey("Authorization"))
            {
                return AuthenticateResult.Fail("Missing Authorization Header");
            }
            try
            {
                var authHeader = AuthenticationHeaderValue.Parse(Request.Headers["Authorization"]);

                /// TODO handle token.
            }
            catch
            {
                return AuthenticateResult.Fail("Invalid Authorization Header");
            }

            var claims = new[] {
                new Claim(ClaimTypes.NameIdentifier, "changeme"),
                new Claim(ClaimTypes.Name, "changeme"),
            };
            var identity = new ClaimsIdentity(claims, Scheme.Name);
            var principal = new ClaimsPrincipal(identity);
            var ticket = new AuthenticationTicket(principal, Scheme.Name);

            return AuthenticateResult.Success(ticket);
        }
    }
}