660 lines
21 KiB
C#
660 lines
21 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO;
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using System.Net;
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using System.Text;
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using System.Threading.Tasks;
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using MediaBrowser.Model.Services;
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using Microsoft.Extensions.Primitives;
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using Microsoft.Net.Http.Headers;
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namespace Emby.Server.Implementations.SocketSharp
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{
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public partial class WebSocketSharpRequest : IHttpRequest
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{
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internal static string GetParameter(ReadOnlySpan<char> header, string attr)
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{
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int ap = header.IndexOf(attr.AsSpan(), StringComparison.Ordinal);
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if (ap == -1)
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{
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return null;
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}
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ap += attr.Length;
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if (ap >= header.Length)
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{
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return null;
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}
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char ending = header[ap];
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if (ending != '"')
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{
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ending = ' ';
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}
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var slice = header.Slice(ap + 1);
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int end = slice.IndexOf(ending);
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if (end == -1)
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{
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return ending == '"' ? null : header.Slice(ap).ToString();
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}
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return slice.Slice(0, end - ap - 1).ToString();
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}
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private async Task LoadMultiPart(WebROCollection form)
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{
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string boundary = GetParameter(ContentType.AsSpan(), "; boundary=");
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if (boundary == null)
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{
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return;
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}
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using (var requestStream = InputStream)
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{
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// DB: 30/01/11 - Hack to get around non-seekable stream and received HTTP request
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// Not ending with \r\n?
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var ms = new MemoryStream(32 * 1024);
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await requestStream.CopyToAsync(ms).ConfigureAwait(false);
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var input = ms;
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ms.WriteByte((byte)'\r');
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ms.WriteByte((byte)'\n');
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input.Position = 0;
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// Uncomment to debug
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// var content = new StreamReader(ms).ReadToEnd();
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// Console.WriteLine(boundary + "::" + content);
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// input.Position = 0;
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var multi_part = new HttpMultipart(input, boundary, ContentEncoding);
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HttpMultipart.Element e;
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while ((e = multi_part.ReadNextElement()) != null)
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{
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if (e.Filename == null)
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{
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byte[] copy = new byte[e.Length];
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input.Position = e.Start;
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await input.ReadAsync(copy, 0, (int)e.Length).ConfigureAwait(false);
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form.Add(e.Name, (e.Encoding ?? ContentEncoding).GetString(copy, 0, copy.Length));
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}
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else
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{
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// We use a substream, as in 2.x we will support large uploads streamed to disk,
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var sub = new HttpPostedFile(e.Filename, e.ContentType, input, e.Start, e.Length);
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files[e.Name] = sub;
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}
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}
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}
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}
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public async Task<QueryParamCollection> GetFormData()
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{
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var form = new WebROCollection();
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files = new Dictionary<string, HttpPostedFile>();
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if (IsContentType("multipart/form-data"))
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{
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await LoadMultiPart(form).ConfigureAwait(false);
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}
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else if (IsContentType("application/x-www-form-urlencoded"))
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{
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await LoadWwwForm(form).ConfigureAwait(false);
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}
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if (validate_form && !checked_form)
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{
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checked_form = true;
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ValidateNameValueCollection("Form", form);
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}
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return form;
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}
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public string Accept => StringValues.IsNullOrEmpty(request.Headers[HeaderNames.Accept]) ? null : request.Headers[HeaderNames.Accept].ToString();
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public string Authorization => StringValues.IsNullOrEmpty(request.Headers[HeaderNames.Authorization]) ? null : request.Headers[HeaderNames.Authorization].ToString();
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protected bool validate_form { get; set; }
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protected bool checked_form { get; set; }
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private static void ThrowValidationException(string name, string key, string value)
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{
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string v = "\"" + value + "\"";
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if (v.Length > 20)
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{
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v = v.Substring(0, 16) + "...\"";
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}
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string msg = string.Format(
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CultureInfo.InvariantCulture,
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"A potentially dangerous Request.{0} value was detected from the client ({1}={2}).",
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name,
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key,
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v);
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throw new Exception(msg);
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}
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private static void ValidateNameValueCollection(string name, QueryParamCollection coll)
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{
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if (coll == null)
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{
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return;
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}
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foreach (var pair in coll)
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{
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var key = pair.Name;
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var val = pair.Value;
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if (val != null && val.Length > 0 && IsInvalidString(val))
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{
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ThrowValidationException(name, key, val);
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}
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}
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}
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internal static bool IsInvalidString(string val)
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=> IsInvalidString(val, out var validationFailureIndex);
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internal static bool IsInvalidString(string val, out int validationFailureIndex)
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{
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validationFailureIndex = 0;
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int len = val.Length;
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if (len < 2)
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{
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return false;
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}
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char current = val[0];
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for (int idx = 1; idx < len; idx++)
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{
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char next = val[idx];
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// See http://secunia.com/advisories/14325
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if (current == '<' || current == '\xff1c')
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{
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if (next == '!' || next < ' '
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|| (next >= 'a' && next <= 'z')
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|| (next >= 'A' && next <= 'Z'))
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{
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validationFailureIndex = idx - 1;
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return true;
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}
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}
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else if (current == '&' && next == '#')
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{
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validationFailureIndex = idx - 1;
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return true;
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}
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current = next;
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}
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return false;
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}
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private bool IsContentType(string ct)
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{
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if (ContentType == null)
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{
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return false;
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}
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return ContentType.StartsWith(ct, StringComparison.OrdinalIgnoreCase);
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}
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private async Task LoadWwwForm(WebROCollection form)
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{
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using (var input = InputStream)
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{
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using (var ms = new MemoryStream())
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{
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await input.CopyToAsync(ms).ConfigureAwait(false);
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ms.Position = 0;
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using (var s = new StreamReader(ms, ContentEncoding))
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{
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var key = new StringBuilder();
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var value = new StringBuilder();
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int c;
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while ((c = s.Read()) != -1)
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{
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if (c == '=')
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{
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value.Length = 0;
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while ((c = s.Read()) != -1)
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{
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if (c == '&')
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{
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AddRawKeyValue(form, key, value);
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break;
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}
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else
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{
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value.Append((char)c);
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}
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}
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if (c == -1)
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{
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AddRawKeyValue(form, key, value);
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return;
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}
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}
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else if (c == '&')
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{
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AddRawKeyValue(form, key, value);
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}
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else
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{
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key.Append((char)c);
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}
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}
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if (c == -1)
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{
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AddRawKeyValue(form, key, value);
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}
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}
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}
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}
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}
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private static void AddRawKeyValue(WebROCollection form, StringBuilder key, StringBuilder value)
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{
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form.Add(WebUtility.UrlDecode(key.ToString()), WebUtility.UrlDecode(value.ToString()));
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key.Length = 0;
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value.Length = 0;
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}
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private Dictionary<string, HttpPostedFile> files;
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private class WebROCollection : QueryParamCollection
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{
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public override string ToString()
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{
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var result = new StringBuilder();
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foreach (var pair in this)
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{
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if (result.Length > 0)
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{
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result.Append('&');
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}
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var key = pair.Name;
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if (key != null && key.Length > 0)
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{
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result.Append(key);
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result.Append('=');
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}
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result.Append(pair.Value);
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}
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return result.ToString();
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}
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}
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private class HttpMultipart
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{
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public class Element
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{
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public string ContentType { get; set; }
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public string Name { get; set; }
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public string Filename { get; set; }
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public Encoding Encoding { get; set; }
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public long Start { get; set; }
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public long Length { get; set; }
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public override string ToString()
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{
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return "ContentType " + ContentType + ", Name " + Name + ", Filename " + Filename + ", Start " +
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Start.ToString(CultureInfo.CurrentCulture) + ", Length " + Length.ToString(CultureInfo.CurrentCulture);
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}
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}
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private const byte LF = (byte)'\n';
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private const byte CR = (byte)'\r';
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private Stream data;
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private string boundary;
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private byte[] boundaryBytes;
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private byte[] buffer;
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private bool atEof;
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private Encoding encoding;
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private StringBuilder sb;
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// See RFC 2046
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// In the case of multipart entities, in which one or more different
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// sets of data are combined in a single body, a "multipart" media type
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// field must appear in the entity's header. The body must then contain
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// one or more body parts, each preceded by a boundary delimiter line,
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// and the last one followed by a closing boundary delimiter line.
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// After its boundary delimiter line, each body part then consists of a
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// header area, a blank line, and a body area. Thus a body part is
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// similar to an RFC 822 message in syntax, but different in meaning.
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public HttpMultipart(Stream data, string b, Encoding encoding)
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{
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this.data = data;
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boundary = b;
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boundaryBytes = encoding.GetBytes(b);
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buffer = new byte[boundaryBytes.Length + 2]; // CRLF or '--'
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this.encoding = encoding;
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sb = new StringBuilder();
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}
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public Element ReadNextElement()
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{
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if (atEof || ReadBoundary())
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{
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return null;
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}
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var elem = new Element();
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ReadOnlySpan<char> header;
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while ((header = ReadHeaders().AsSpan()) != null)
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{
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if (header.StartsWith("Content-Disposition:".AsSpan(), StringComparison.OrdinalIgnoreCase))
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{
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elem.Name = GetContentDispositionAttribute(header, "name");
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elem.Filename = StripPath(GetContentDispositionAttributeWithEncoding(header, "filename"));
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}
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else if (header.StartsWith("Content-Type:".AsSpan(), StringComparison.OrdinalIgnoreCase))
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{
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elem.ContentType = header.Slice("Content-Type:".Length).Trim().ToString();
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elem.Encoding = GetEncoding(elem.ContentType);
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}
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}
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long start = data.Position;
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elem.Start = start;
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long pos = MoveToNextBoundary();
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if (pos == -1)
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{
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return null;
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}
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elem.Length = pos - start;
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return elem;
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}
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private string ReadLine()
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{
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// CRLF or LF are ok as line endings.
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bool got_cr = false;
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int b = 0;
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sb.Length = 0;
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while (true)
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{
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b = data.ReadByte();
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if (b == -1)
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{
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return null;
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}
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if (b == LF)
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{
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break;
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}
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got_cr = b == CR;
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sb.Append((char)b);
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}
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if (got_cr)
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{
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sb.Length--;
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}
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return sb.ToString();
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}
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private static string GetContentDispositionAttribute(ReadOnlySpan<char> l, string name)
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{
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int idx = l.IndexOf((name + "=\"").AsSpan(), StringComparison.Ordinal);
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if (idx < 0)
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{
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return null;
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}
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int begin = idx + name.Length + "=\"".Length;
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int end = l.Slice(begin).IndexOf('"');
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if (end < 0)
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{
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return null;
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}
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if (begin == end)
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{
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return string.Empty;
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}
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return l.Slice(begin, end - begin).ToString();
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}
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private string GetContentDispositionAttributeWithEncoding(ReadOnlySpan<char> l, string name)
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{
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int idx = l.IndexOf((name + "=\"").AsSpan(), StringComparison.Ordinal);
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if (idx < 0)
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{
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return null;
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}
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int begin = idx + name.Length + "=\"".Length;
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int end = l.Slice(begin).IndexOf('"');
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if (end < 0)
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{
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return null;
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}
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if (begin == end)
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{
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return string.Empty;
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}
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ReadOnlySpan<char> temp = l.Slice(begin, end - begin);
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byte[] source = new byte[temp.Length];
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for (int i = temp.Length - 1; i >= 0; i--)
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{
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source[i] = (byte)temp[i];
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}
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return encoding.GetString(source, 0, source.Length);
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}
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private bool ReadBoundary()
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{
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try
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{
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string line;
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do
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{
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line = ReadLine();
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}
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while (line.Length == 0);
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if (line[0] != '-' || line[1] != '-')
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{
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return false;
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}
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if (!line.EndsWith(boundary, StringComparison.Ordinal))
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{
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return true;
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}
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}
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catch
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{
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}
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return false;
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}
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private string ReadHeaders()
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{
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string s = ReadLine();
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if (s.Length == 0)
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{
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return null;
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}
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return s;
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}
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private static bool CompareBytes(byte[] orig, byte[] other)
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{
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for (int i = orig.Length - 1; i >= 0; i--)
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{
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if (orig[i] != other[i])
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{
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return false;
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}
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}
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return true;
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}
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private long MoveToNextBoundary()
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{
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long retval = 0;
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bool got_cr = false;
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int state = 0;
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int c = data.ReadByte();
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while (true)
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{
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if (c == -1)
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{
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return -1;
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}
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if (state == 0 && c == LF)
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{
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retval = data.Position - 1;
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if (got_cr)
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{
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retval--;
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}
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state = 1;
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c = data.ReadByte();
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}
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else if (state == 0)
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{
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got_cr = c == CR;
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c = data.ReadByte();
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}
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else if (state == 1 && c == '-')
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{
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c = data.ReadByte();
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if (c == -1)
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{
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return -1;
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}
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if (c != '-')
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{
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state = 0;
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got_cr = false;
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continue; // no ReadByte() here
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}
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int nread = data.Read(buffer, 0, buffer.Length);
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int bl = buffer.Length;
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if (nread != bl)
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{
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return -1;
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}
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if (!CompareBytes(boundaryBytes, buffer))
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{
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state = 0;
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data.Position = retval + 2;
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if (got_cr)
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{
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data.Position++;
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got_cr = false;
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}
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c = data.ReadByte();
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continue;
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}
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if (buffer[bl - 2] == '-' && buffer[bl - 1] == '-')
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{
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atEof = true;
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}
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else if (buffer[bl - 2] != CR || buffer[bl - 1] != LF)
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{
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state = 0;
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data.Position = retval + 2;
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if (got_cr)
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{
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data.Position++;
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got_cr = false;
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}
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c = data.ReadByte();
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continue;
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}
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data.Position = retval + 2;
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if (got_cr)
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{
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data.Position++;
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}
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break;
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}
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else
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{
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// state == 1
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state = 0; // no ReadByte() here
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}
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}
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return retval;
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}
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private static string StripPath(string path)
|
|
{
|
|
if (path == null || path.Length == 0)
|
|
{
|
|
return path;
|
|
}
|
|
|
|
if (path.IndexOf(":\\", StringComparison.Ordinal) != 1
|
|
&& !path.StartsWith("\\\\", StringComparison.Ordinal))
|
|
{
|
|
return path;
|
|
}
|
|
|
|
return path.Substring(path.LastIndexOf('\\') + 1);
|
|
}
|
|
}
|
|
}
|
|
}
|