108 lines
3.5 KiB
C#
108 lines
3.5 KiB
C#
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using System.Text.RegularExpressions;
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namespace Uwaa.HTTP.Routing;
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/// <summary>
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/// Special router which serves static files from the filesystem.
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/// </summary>
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public partial class FileEndpoint : RouterBase
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{
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static MIMEType GuessMIMEType(string extension)
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{
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return extension switch
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{
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".txt" => new("text", "plain"),
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".htm" or "html" => new("text", "html"),
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".js" => new("text", "javascript"),
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".css" => new("text", "css"),
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".csv" => new("text", "csv"),
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".bin" => new("application", "octet-stream"),
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".zip" => new("application", "zip"),
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".7z" => new("application", "x-7z-compressed"),
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".gz" => new("application", "gzip"),
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".xml" => new("application", "xml"),
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".pdf" => new("application", "pdf"),
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".json" => new("application", "json"),
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".bmp" => new("image", "bmp"),
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".png" => new("image", "png"),
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".jpg" or "jpeg" => new("image", "jpeg"),
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".gif" => new("image", "gif"),
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".webp" => new("image", "webp"),
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".svg" => new("image", "svg+xml"),
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".ico" => new("image", "vnd.microsoft.icon"),
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".mid" or ".midi" => new("audio", "midi"),
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".mp3" => new("audio", "mpeg"),
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".ogg" or ".oga" or ".opus" => new("audio", "ogg"),
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".wav" => new("audio", "wav"),
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".weba" => new("audio", "webm"),
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".webm" => new("video", "webm"),
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".mp4" => new("video", "mp4"),
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".mpeg" => new("video", "mpeg"),
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".ogv" => new("video", "ogg"),
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".otf" => new("font", "otf"),
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".ttf" => new("font", "ttf"),
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".woff" => new("font", "woff"),
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".woff2" => new("font", "woff2"),
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_ => new("application", "octet-stream"), //Unknown
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};
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}
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/// <summary>
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/// The source directory from which assets should be served.
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/// </summary>
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public string Directory;
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public override HttpMethod Method => HttpMethod.GET;
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public override int Arguments => 1;
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public FileEndpoint(string directory)
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{
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Directory = directory;
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}
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protected override async Task<HttpResponse?> GetResponseInner(HttpRequest req, HttpClientInfo info, ArraySegment<string> path)
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{
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string? asset = path[0];
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if (string.IsNullOrWhiteSpace(asset))
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return null;
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if (FilenameChecker().IsMatch(asset))
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return HttpResponse.BadRequest("Illegal chars in asset path");
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string assetPath = $"{Directory}/{asset}";
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FileInfo fileInfo = new FileInfo(assetPath);
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MIMEType mime;
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if (string.IsNullOrEmpty(fileInfo.Extension))
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{
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mime = new MIMEType("text", "html");
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assetPath += ".htm";
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}
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else
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{
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mime = GuessMIMEType(fileInfo.Extension);
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}
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if (!File.Exists(assetPath))
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return null;
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return new HttpContent(mime, await File.ReadAllBytesAsync(assetPath));
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}
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/// <summary>
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/// Ensures filenames are legal.
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/// </summary>
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/// <remarks>
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/// Enforcing a set of legal characters in filenames reduces the potential attack surface against the server.
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/// </remarks>
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/// <returns>Returns a regular expression which checks for invalid characters.</returns>
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[GeneratedRegex(@"[^a-zA-Z0-9_\-.()\[\] ]")]
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private static partial Regex FilenameChecker();
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}
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