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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Text.Encodings.Web;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.FileProviders;
using Microsoft.Extensions.Options;
namespace Microsoft.AspNetCore.StaticFiles;
/// <summary>
/// Enables directory browsing
/// </summary>
public class DirectoryBrowserMiddleware
{
private readonly DirectoryBrowserOptions _options;
private readonly PathString _matchUrl;
private readonly RequestDelegate _next;
private readonly IDirectoryFormatter _formatter;
private readonly IFileProvider _fileProvider;
/// <summary>
/// Creates a new instance of the SendFileMiddleware. Using <see cref="HtmlEncoder.Default"/> instance.
/// </summary>
/// <param name="next">The next middleware in the pipeline.</param>
/// <param name="hostingEnv">The <see cref="IWebHostEnvironment"/> used by this middleware.</param>
/// <param name="options">The configuration for this middleware.</param>
public DirectoryBrowserMiddleware(RequestDelegate next, IWebHostEnvironment hostingEnv, IOptions<DirectoryBrowserOptions> options)
: this(next, hostingEnv, HtmlEncoder.Default, options)
{
}
/// <summary>
/// Creates a new instance of the SendFileMiddleware.
/// </summary>
/// <param name="next">The next middleware in the pipeline.</param>
/// <param name="hostingEnv">The <see cref="IWebHostEnvironment"/> used by this middleware.</param>
/// <param name="encoder">The <see cref="HtmlEncoder"/> used by the default <see cref="HtmlDirectoryFormatter"/>.</param>
/// <param name="options">The configuration for this middleware.</param>
public DirectoryBrowserMiddleware(RequestDelegate next, IWebHostEnvironment hostingEnv, HtmlEncoder encoder, IOptions<DirectoryBrowserOptions> options)
{
ArgumentNullException.ThrowIfNull(next);
ArgumentNullException.ThrowIfNull(hostingEnv);
ArgumentNullException.ThrowIfNull(encoder);
ArgumentNullException.ThrowIfNull(options);
_next = next;
_options = options.Value;
_fileProvider = _options.FileProvider ?? Helpers.ResolveFileProvider(hostingEnv);
_formatter = _options.Formatter ?? new HtmlDirectoryFormatter(encoder);
_matchUrl = _options.RequestPath;
}
/// <summary>
/// Examines the request to see if it matches a configured directory. If so, a view of the directory contents is returned.
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public Task Invoke(HttpContext context)
{
// Check if the URL matches any expected paths, skip if an endpoint with a request delegate was selected
if (context.GetEndpoint()?.RequestDelegate is null
&& Helpers.IsGetOrHeadMethod(context.Request.Method)
&& Helpers.TryMatchPath(context, _matchUrl, forDirectory: true, subpath: out var subpath)
&& TryGetDirectoryInfo(subpath, out var contents))
{
// 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 (_options.RedirectToAppendTrailingSlash && !Helpers.PathEndsInSlash(context.Request.Path))
{
Helpers.RedirectToPathWithSlash(context);
return Task.CompletedTask;
}
return _formatter.GenerateContentAsync(context, contents);
}
return _next(context);
}
private bool TryGetDirectoryInfo(PathString subpath, out IDirectoryContents contents)
{
// TryMatchPath will not output an empty subpath when it returns true. This is called only in that case.
contents = _fileProvider.GetDirectoryContents(subpath.Value!);
return contents.Exists;
}
}
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