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DefaultFilesMiddleware.cs
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DefaultFilesMiddleware.cs
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.FileProviders;
using Microsoft.Extensions.Options;
using Microsoft.Net.Http.Headers;
namespace Microsoft.AspNetCore.StaticFiles
{
/// <summary>
/// This examines a directory path and determines if there is a default file present.
/// If so the file name is appended to the path and execution continues.
/// Note we don't just serve the file because it may require interpretation.
/// </summary>
public class DefaultFilesMiddleware
{
private readonly DefaultFilesOptions _options;
private readonly PathString _matchUrl;
private readonly RequestDelegate _next;
private readonly IFileProvider _fileProvider;
/// <summary>
/// Creates a new instance of the DefaultFilesMiddleware.
/// </summary>
/// <param name="next">The next middleware in the pipeline.</param>
/// <param name="hostingEnv">The <see cref="IHostingEnvironment"/> used by this middleware.</param>
/// <param name="options">The configuration options for this middleware.</param>
public DefaultFilesMiddleware(RequestDelegate next, IHostingEnvironment hostingEnv, IOptions<DefaultFilesOptions> options)
{
if (next == null)
{
throw new ArgumentNullException(nameof(next));
}
if (hostingEnv == null)
{
throw new ArgumentNullException(nameof(hostingEnv));
}
if (options == null)
{
throw new ArgumentNullException(nameof(options));
}
_next = next;
_options = options.Value;
_fileProvider = _options.FileProvider ?? Helpers.ResolveFileProvider(hostingEnv);
_matchUrl = _options.RequestPath;
}
/// <summary>
/// This examines the request to see if it matches a configured directory, and if there are any files with the
/// configured default names in that directory. If so this will append the corresponding file name to the request
/// path for a later middleware to handle.
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public Task Invoke(HttpContext context)
{
if (Helpers.IsGetOrHeadMethod(context.Request.Method)
&& Helpers.TryMatchPath(context, _matchUrl, forDirectory: true, subpath: out var subpath))
{
var dirContents = _fileProvider.GetDirectoryContents(subpath.Value);
if (dirContents.Exists)
{
// Check if any of our default files exist.
for (int matchIndex = 0; matchIndex < _options.DefaultFileNames.Count; matchIndex++)
{
string defaultFile = _options.DefaultFileNames[matchIndex];
var file = _fileProvider.GetFileInfo(subpath.Value + defaultFile);
// TryMatchPath will make sure subpath always ends with a "/" by adding it if needed.
if (file.Exists)
{
// If the path matches a directory but does not end in a slash, redirect to add the slash.
// This prevents relative links from breaking.
if (!Helpers.PathEndsInSlash(context.Request.Path))
{
context.Response.StatusCode = 301;
context.Response.Headers[HeaderNames.Location] = context.Request.PathBase + context.Request.Path + "/" + context.Request.QueryString;
return Task.CompletedTask;
}
// Match found, re-write the url. A later middleware will actually serve the file.
context.Request.Path = new PathString(context.Request.Path.Value + defaultFile);
break;
}
}
}
}
return _next(context);
}
}
}