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using System.Linq;
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using System.Threading.Tasks;
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using Lidarr.Http.Extensions;
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using Microsoft.AspNetCore.Http;
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using Microsoft.AspNetCore.StaticFiles;
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namespace Lidarr.Http.Middleware
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{
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public class IfModifiedMiddleware
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{
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private readonly RequestDelegate _next;
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private readonly ICacheableSpecification _cacheableSpecification;
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private readonly IContentTypeProvider _mimeTypeProvider;
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public IfModifiedMiddleware(RequestDelegate next, ICacheableSpecification cacheableSpecification)
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{
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_next = next;
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_cacheableSpecification = cacheableSpecification;
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_mimeTypeProvider = new FileExtensionContentTypeProvider();
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}
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public async Task InvokeAsync(HttpContext context)
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{
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if (_cacheableSpecification.IsCacheable(context.Request) && context.Request.Headers["IfModifiedSince"].Any())
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{
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context.Response.StatusCode = 304;
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context.Response.Headers.EnableCache();
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if (!_mimeTypeProvider.TryGetContentType(context.Request.Path.ToString(), out var mimeType))
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{
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mimeType = "application/octet-stream";
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}
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context.Response.ContentType = mimeType;
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return;
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}
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await _next(context);
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}
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}
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}
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