365 lines
13 KiB
C#
365 lines
13 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Net;
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using System.Text;
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using System.Text.RegularExpressions;
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using System.Threading.Tasks;
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namespace Tesses.WebServer
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{
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//This file contains modified code from https://github.com/dajuric/simple-http
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/// <summary>
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/// Delegate executed when a file is about to be read from a body stream.
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/// </summary>
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/// <param name="fieldName">Field name.</param>
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/// <param name="fileName">name of the file.</param>
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/// <param name="contentType">Content type.</param>
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/// <returns>Stream to be populated.</returns>
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public delegate Stream OnFile(string fieldName, string fileName, string contentType);
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public static class DajuricSimpleHttpExtensions
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{
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const string BYTES_RANGE_HEADER = "Range";
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static bool ParseForm(this ServerContext ctx)
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{
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var args = ctx.QueryParams;
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string content_type = ctx.RequestHeaders.GetFirst("Content-Type");
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if (content_type != "application/x-www-form-urlencoded")
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return false;
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var str = ctx.BodyAsString();
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if (str == null)
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return false;
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foreach (var pair in str.Split('&'))
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{
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var nameValue = pair.Split('=');
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if (nameValue.Length != (1 + 1))
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continue;
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args.Add(nameValue[0], WebUtility.UrlDecode(nameValue[1]));
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}
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return true;
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}
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static string BodyAsString(this ServerContext ctx)
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{
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string str = null;
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using (var reader = new StreamReader(ctx.NetworkStream))
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{
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str = reader.ReadToEnd();
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}
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return str;
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}
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public static async Task SendStreamAsync(this ServerContext ctx, Stream strm, string contentType = "application/octet-stream")
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{
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//ctx.StatusCode = 200;
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int start = 0, end = (int)strm.Length - 1;
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if (ctx.RequestHeaders.ContainsKey(BYTES_RANGE_HEADER))
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{
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if (ctx.RequestHeaders[BYTES_RANGE_HEADER].Count > 1)
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{
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throw new NotSupportedException("Multiple 'Range' headers are not supported.");
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}
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var range = ctx.RequestHeaders[BYTES_RANGE_HEADER][0].Replace("bytes=", String.Empty)
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.Split(new string[] { "-" }, StringSplitOptions.RemoveEmptyEntries)
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.Select(x => Int32.Parse(x))
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.ToArray();
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start = (range.Length > 0) ? range[0] : 0;
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end = (range.Length > 1) ? range[1] : (int)(strm.Length - 1);
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var hdrs = ctx.ResponseHeaders;
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hdrs.Add("Accept-Ranges", "bytes");
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hdrs.Add("Content-Range", "bytes " + start + "-" + end + "/" + strm.Length);
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ctx.StatusCode = 206;
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}
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ctx.ResponseHeaders.Add("Content-Length", (end - start + 1).ToString());
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ctx.ResponseHeaders.Add("Content-Type", contentType);
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await ctx.WriteHeadersAsync();
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if (!ctx.Method.Equals("HEAD", StringComparison.Ordinal))
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{
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try
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{
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strm.Position = start;
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strm.CopyTo(ctx.NetworkStream, Math.Min(8 * 1024 * 1024, end - start + 1));
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}
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finally
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{
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strm.Close();
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ctx.NetworkStream.Close();
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}
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}
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}
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static Dictionary<string, HttpFile> ParseMultipartForm(ServerContext serverCtx, OnFile onFile)
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{
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var args = serverCtx.QueryParams;
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string content_type=serverCtx.RequestHeaders.GetFirst("Content-Type");
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if (content_type.StartsWith("multipart/form-data",StringComparison.Ordinal) == false)
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throw new InvalidDataException("Not 'multipart/form-data'.");
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var boundary = Regex.Match(content_type, "boundary=(.+)").Groups[1].Value;
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boundary = "--" + boundary;
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var files = new Dictionary<string, HttpFile>();
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var inputStream = new BufferedStream(serverCtx.NetworkStream);
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parseUntillBoundaryEnd(inputStream, new MemoryStream(), boundary);
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while (true)
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{
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var (n, v, fn, ct) = parseSection(inputStream, "\r\n" + boundary, onFile);
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if (String.IsNullOrEmpty(n)) break;
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v.Position = 0;
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if (!String.IsNullOrEmpty(fn))
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files.Add(n, new HttpFile(fn, v, ct));
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else
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args.Add(n, readAsString(v));
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}
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return files;
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}
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private static (string Name, Stream Value, string FileName, string ContentType) parseSection(Stream source, string boundary, OnFile onFile)
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{
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var (n, fn, ct) = readContentDisposition(source);
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source.ReadByte(); source.ReadByte(); //\r\n (empty row)
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var dst = String.IsNullOrEmpty(fn) ? new MemoryStream() : onFile(n, fn, ct);
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if (dst == null)
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throw new ArgumentException(nameof(onFile), "The on-file callback must return a stream.");
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parseUntillBoundaryEnd(source, dst, boundary);
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return (n, dst, fn, ct);
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}
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private static (string Name, string FileName, string ContentType) readContentDisposition(Stream stream)
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{
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const string UTF_FNAME = "utf-8''";
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var l = readLine(stream);
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if (String.IsNullOrEmpty(l))
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return (null, null, null);
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//(regex matches are taken from NancyFX) and modified
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var n = Regex.Match(l, @"name=""?(?<n>[^\""]*)").Groups["n"].Value;
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var f = Regex.Match(l, @"filename\*?=""?(?<f>[^\"";]*)").Groups["f"]?.Value;
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string cType = null;
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if (!String.IsNullOrEmpty(f))
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{
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if (f.StartsWith(UTF_FNAME))
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f = Uri.UnescapeDataString(f.Substring(UTF_FNAME.Length));
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l = readLine(stream);
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cType = Regex.Match(l, "Content-Type: (?<cType>.+)").Groups["cType"].Value;
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}
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return (n, f, cType);
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}
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private static void parseUntillBoundaryEnd(Stream source, Stream destination, string boundary)
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{
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var checkBuffer = new byte[boundary.Length]; //for boundary checking
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int b, i = 0;
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while ((b = source.ReadByte()) != -1)
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{
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if (i == boundary.Length) //boundary found -> go to the end of line
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{
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if (b == '\n') break;
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continue;
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}
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if (b == boundary[i]) //start filling the check buffer
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{
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checkBuffer[i] = (byte)b;
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i++;
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}
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else
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{
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var idx = 0;
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while (idx < i) //write the buffer data to stream
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{
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destination.WriteByte(checkBuffer[idx]);
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idx++;
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}
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i = 0;
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destination.WriteByte((byte)b); //write the current byte
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}
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}
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}
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private static string readLine(Stream stream)
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{
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var sb = new StringBuilder();
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int b;
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while ((b = stream.ReadByte()) != -1 && b != '\n')
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sb.Append((char)b);
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if (sb.Length > 0 && sb[sb.Length - 1] == '\r')
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sb.Remove(sb.Length - 1, 1);
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return sb.ToString();
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}
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private static string readAsString(Stream stream)
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{
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var sb = new StringBuilder();
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int b;
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while ((b = stream.ReadByte()) != -1)
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sb.Append((char)b);
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return sb.ToString();
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}
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/// <summary>
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/// Parses body of the request including form and multi-part form data.
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/// </summary>
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/// <param name="request">HTTP request.</param>
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/// <param name="args">Key-value pairs populated by the form data by this function.</param>
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/// <returns>Name-file pair collection.</returns>
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public static Dictionary<string, HttpFile> ParseBody(this ServerContext ctx)
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{
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return ctx.ParseBody( (n, fn, ct) => new MemoryStream());
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}
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/// <summary>
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/// Parses body of the request including form and multi-part form data.
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/// </summary>
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/// <param name="request">HTTP request.</param>
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/// <param name="args">Key-value pairs populated by the form data by this function.</param>
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/// <param name="onFile">
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/// Function called if a file is about to be parsed. The stream is attached to a corresponding <see cref="HttpFile"/>.
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/// <para>By default, <see cref="MemoryStream"/> is used, but for large files, it is recommended to open <see cref="FileStream"/> directly.</para>
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/// </param>
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/// <returns>Name-file pair collection.</returns>
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public static Dictionary<string, HttpFile> ParseBody(this ServerContext request, OnFile onFile)
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{
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if (request == null)
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throw new ArgumentNullException(nameof(request));
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if (!request.RequestHeaders.ContainsKey("Content-Type"))
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throw new ArgumentNullException("request.RequestHeaders[\"Content-Type\"]");
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if (onFile == null)
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throw new ArgumentNullException(nameof(onFile));
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var files = new Dictionary<string, HttpFile>();
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string content_type = request.RequestHeaders.GetFirst("Content-Type");
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if (content_type.StartsWith("application/x-www-form-urlencoded",StringComparison.Ordinal))
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{
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ParseForm(request);
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}
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else if (content_type.StartsWith("multipart/form-data",StringComparison.Ordinal))
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{
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files = ParseMultipartForm(request, onFile);
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}
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else
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throw new NotSupportedException("The body content-type is not supported.");
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return files;
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}
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}
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/// <summary>
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/// HTTP file data container.
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/// </summary>
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public class HttpFile : IDisposable
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{
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/// <summary>
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/// Creates new HTTP file data container.
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/// </summary>
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/// <param name="fileName">File name.</param>
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/// <param name="value">Data.</param>
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/// <param name="contentType">Content type.</param>
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internal HttpFile(string fileName, Stream value, string contentType)
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{
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Value = value;
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FileName = fileName;
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ContentType = contentType;
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}
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/// <summary>
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/// Gets the name of the file.
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/// </summary>
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public string FileName { get; private set; }
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/// <summary>
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/// Gets the data.
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/// <para>If a stream is created <see cref="OnFile"/> it will be closed when this HttpFile object is disposed.</para>
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/// </summary>
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public Stream Value { get; private set; }
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/// <summary>
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/// Content type.
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/// </summary>
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public string ContentType { get; private set; }
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/// <summary>
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/// Saves the data into a file.
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/// <para>Directory path will be auto created if does not exists.</para>
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/// </summary>
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/// <param name="fileName">File path with name.</param>
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/// <param name="overwrite">True to overwrite the existing file, false otherwise.</param>
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/// <returns>True if the file is saved/overwritten, false otherwise.</returns>
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public bool Save(string fileName, bool overwrite = false)
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{
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if (File.Exists(Path.GetFullPath(fileName)))
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return false;
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var dir = Path.GetDirectoryName(Path.GetFullPath(fileName));
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Directory.CreateDirectory(dir);
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Value.Position = 0;
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using (var outStream = File.OpenWrite(fileName))
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Value.CopyTo(outStream);
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return true;
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}
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/// <summary>
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/// Disposes the current instance.
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/// </summary>
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public void Dispose()
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{
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if (Value != null)
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{
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Value?.Dispose();
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Value = null;
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}
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}
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/// <summary>
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/// Disposes the current instance.
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/// </summary>
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~HttpFile()
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{
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Dispose();
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}
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}
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}
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