#region license
// This file is part of Vocaluxe.
//
// Vocaluxe is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Vocaluxe 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
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Vocaluxe. If not, see <http://www.gnu.org/licenses/>.
#endregion

using Microsoft.AspNetCore.Mvc;

namespace VocaluxeWeb.Api
{
    static class CImageResult
    {
        /// Serves a cached JPEG with ETag, so browsers only download it once.
        public static IActionResult Create(ControllerBase controller, string file, string etag)
        {
            var response = controller.Response;
            response.Headers["Cache-Control"] = "public, max-age=86400";
            response.Headers["ETag"] = etag;
            if (controller.Request.Headers["If-None-Match"] == etag)
            {
                return controller.StatusCode(304);
            }

            return controller.PhysicalFile(file, "image/jpeg");
        }
    }
}