/*
This file is part of the Notesnook Sync Server project (https://notesnook.com/)

Copyright (C) 2023 Streetwriters (Private) Limited

This program is free software: you can redistribute it and/or modify
it under the terms of the Affero GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Affero GNU General Public License for more details.

You should have received a copy of the Affero GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

using System.Linq;
using IdentityModel;
using IdentityServer4.Validation;
using Microsoft.AspNetCore.Http;

namespace Streetwriters.Identity.Validation
{
    public class BearerTokenValidator
    {
        /// <summary>
        /// Validates the authorization header.
        /// </summary>
        /// <param name="context">The context.</param>
        /// <returns></returns>
        public static BearerTokenUsageValidationResult ValidateAuthorizationHeader(HttpContext context)
        {
            var authorizationHeader = context.Request.Headers["Authorization"].FirstOrDefault();
            if (!string.IsNullOrEmpty(authorizationHeader))
            {
                var header = authorizationHeader.Trim();
                if (header.StartsWith(OidcConstants.AuthenticationSchemes.AuthorizationHeaderBearer))
                {
                    var value = header.Substring(OidcConstants.AuthenticationSchemes.AuthorizationHeaderBearer.Length).Trim();
                    if (!string.IsNullOrEmpty(value))
                    {
                        return new BearerTokenUsageValidationResult
                        {
                            TokenFound = true,
                            Token = value,
                            UsageType = BearerTokenUsageType.AuthorizationHeader
                        };
                    }
                }
                else
                {

                }
            }

            return new BearerTokenUsageValidationResult();
        }
    }
}