98 lines
4.1 KiB
C#
98 lines
4.1 KiB
C#
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.Threading.Tasks;
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using Microsoft.AspNet.Builder;
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using Microsoft.AspNet.FileProviders;
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using Microsoft.AspNet.Hosting;
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using Microsoft.AspNet.Http;
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using Microsoft.Framework.Logging;
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namespace Microsoft.AspNet.StaticFiles
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{
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/// <summary>
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/// Enables serving static files for a given request path
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/// </summary>
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public class StaticFileMiddleware
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{
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private readonly StaticFileOptions _options;
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private readonly PathString _matchUrl;
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private readonly RequestDelegate _next;
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private readonly ILogger _logger;
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/// <summary>
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/// Creates a new instance of the StaticFileMiddleware.
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/// </summary>
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/// <param name="next">The next middleware in the pipeline.</param>
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/// <param name="options">The configuration options.</param>
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/// <param name="loggerFactory">An <see cref="ILoggerFactory"/> instance used to create loggers.</param>
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public StaticFileMiddleware([NotNull] RequestDelegate next, [NotNull] IHostingEnvironment hostingEnv, [NotNull] StaticFileOptions options, [NotNull] ILoggerFactory loggerFactory)
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{
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if (options.ContentTypeProvider == null)
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{
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throw new ArgumentException(Resources.Args_NoContentTypeProvider);
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}
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options.ResolveFileProvider(hostingEnv);
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_next = next;
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_options = options;
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_matchUrl = options.RequestPath;
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_logger = loggerFactory.Create<StaticFileMiddleware>();
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}
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/// <summary>
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/// Processes a request to determine if it matches a known file, and if so, serves it.
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/// </summary>
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/// <param name="context"></param>
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/// <returns></returns>
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public Task Invoke(HttpContext context)
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{
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var fileContext = new StaticFileContext(context, _options, _matchUrl, _logger);
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if (fileContext.ValidateMethod()
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&& fileContext.ValidatePath()
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&& fileContext.LookupContentType()
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&& fileContext.LookupFileInfo())
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{
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fileContext.ComprehendRequestHeaders();
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switch (fileContext.GetPreconditionState())
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{
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case StaticFileContext.PreconditionState.Unspecified:
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case StaticFileContext.PreconditionState.ShouldProcess:
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if (fileContext.IsHeadMethod)
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{
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return fileContext.SendStatusAsync(Constants.Status200Ok);
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}
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if (fileContext.IsRangeRequest)
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{
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return fileContext.SendRangeAsync();
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}
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if (_logger.IsEnabled(LogLevel.Verbose))
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{
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_logger.WriteVerbose(string.Format("Copying file {0} to the response body", fileContext.SubPath));
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}
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return fileContext.SendAsync();
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case StaticFileContext.PreconditionState.NotModified:
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if (_logger.IsEnabled(LogLevel.Verbose))
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{
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_logger.WriteVerbose(string.Format("{0} not modified", fileContext.SubPath));
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}
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return fileContext.SendStatusAsync(Constants.Status304NotModified);
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case StaticFileContext.PreconditionState.PreconditionFailed:
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return fileContext.SendStatusAsync(Constants.Status412PreconditionFailed);
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default:
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var exception = new NotImplementedException(fileContext.GetPreconditionState().ToString());
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_logger.WriteError("No precondition state specified", exception);
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throw exception;
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}
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}
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return _next(context);
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}
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}
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}
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