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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.Collections.Generic;
using System.Collections.Specialized;
using System.Diagnostics;
using System.Globalization;
using System.Net.WebSockets;
using System.Reflection;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;
namespace System.Net
{
public sealed unsafe partial class HttpListenerRequest
{
private CookieCollection? _cookies;
private bool? _keepAlive;
private string? _rawUrl;
private Uri? _requestUri;
private Version _version;
public string[]? AcceptTypes => Helpers.ParseMultivalueHeader(Headers[HttpKnownHeaderNames.Accept]!);
public string[]? UserLanguages => Helpers.ParseMultivalueHeader(Headers[HttpKnownHeaderNames.AcceptLanguage]!);
private CookieCollection ParseCookies(Uri? uri, string setCookieHeader)
{
if (NetEventSource.Log.IsEnabled()) NetEventSource.Info(this, "uri:" + uri + " setCookieHeader:" + setCookieHeader);
CookieCollection cookies = new CookieCollection();
CookieParser parser = new CookieParser(setCookieHeader);
while (true)
{
Cookie? cookie = parser.GetServer();
if (cookie == null)
{
// EOF, done.
break;
}
if (NetEventSource.Log.IsEnabled()) NetEventSource.Info(this, "CookieParser returned cookie: " + cookie.ToString());
if (cookie.Name.Length == 0)
{
continue;
}
cookies.InternalAdd(cookie, true);
}
return cookies;
}
public CookieCollection Cookies
{
get
{
if (_cookies == null)
{
string? cookieString = Headers[HttpKnownHeaderNames.Cookie];
if (!string.IsNullOrEmpty(cookieString))
{
_cookies = ParseCookies(RequestUri, cookieString);
}
_cookies ??= new CookieCollection();
}
return _cookies;
}
}
public Encoding ContentEncoding
{
get
{
if (UserAgent != null && CultureInfo.InvariantCulture.CompareInfo.IsPrefix(UserAgent, "UP"))
{
string? postDataCharset = Headers["x-up-devcap-post-charset"];
if (postDataCharset != null && postDataCharset.Length > 0)
{
try
{
return Encoding.GetEncoding(postDataCharset);
}
catch (ArgumentException)
{
}
}
}
if (HasEntityBody)
{
if (ContentType != null)
{
string? charSet = Helpers.GetCharSetValueFromHeader(ContentType);
if (charSet != null)
{
try
{
return Encoding.GetEncoding(charSet);
}
catch (ArgumentException)
{
}
}
}
}
return Encoding.Default;
}
}
public string? ContentType => Headers[HttpKnownHeaderNames.ContentType];
public bool IsLocal => LocalEndPoint!.Address.Equals(RemoteEndPoint!.Address);
public bool IsWebSocketRequest
{
get
{
if (!SupportsWebSockets)
{
return false;
}
bool foundConnectionUpgradeHeader = false;
if (string.IsNullOrEmpty(Headers[HttpKnownHeaderNames.Connection]) || string.IsNullOrEmpty(Headers[HttpKnownHeaderNames.Upgrade]))
{
return false;
}
foreach (string connection in Headers.GetValues(HttpKnownHeaderNames.Connection)!)
{
if (string.Equals(connection, HttpKnownHeaderNames.Upgrade, StringComparison.OrdinalIgnoreCase))
{
foundConnectionUpgradeHeader = true;
break;
}
}
if (!foundConnectionUpgradeHeader)
{
return false;
}
foreach (string upgrade in Headers.GetValues(HttpKnownHeaderNames.Upgrade)!)
{
if (string.Equals(upgrade, HttpWebSocket.WebSocketUpgradeToken, StringComparison.OrdinalIgnoreCase))
{
return true;
}
}
return false;
}
}
public bool KeepAlive
{
get
{
if (!_keepAlive.HasValue)
{
string? header = Headers[HttpKnownHeaderNames.ProxyConnection];
if (string.IsNullOrEmpty(header))
{
header = Headers[HttpKnownHeaderNames.Connection];
}
if (string.IsNullOrEmpty(header))
{
if (ProtocolVersion >= HttpVersion.Version11)
{
_keepAlive = true;
}
else
{
header = Headers[HttpKnownHeaderNames.KeepAlive];
_keepAlive = !string.IsNullOrEmpty(header);
}
}
else
{
header = header.ToLowerInvariant();
_keepAlive =
header.IndexOf("close", StringComparison.OrdinalIgnoreCase) < 0 ||
header.Contains("keep-alive", StringComparison.OrdinalIgnoreCase);
}
}
if (NetEventSource.Log.IsEnabled()) NetEventSource.Info(this, "_keepAlive=" + _keepAlive);
return _keepAlive.Value;
}
}
public NameValueCollection QueryString
{
get
{
NameValueCollection queryString = new NameValueCollection();
Helpers.FillFromString(queryString, Url!.Query, true, ContentEncoding);
return queryString;
}
}
public string? RawUrl => _rawUrl;
private string RequestScheme => IsSecureConnection ? UriScheme.Https : UriScheme.Http;
public string? UserAgent => Headers[HttpKnownHeaderNames.UserAgent];
public string UserHostAddress => LocalEndPoint!.ToString();
public string UserHostName => Headers[HttpKnownHeaderNames.Host]!;
public Uri? UrlReferrer
{
get
{
string? referrer = Headers[HttpKnownHeaderNames.Referer];
if (referrer == null)
{
return null;
}
bool success = Uri.TryCreate(referrer, UriKind.RelativeOrAbsolute, out Uri? urlReferrer);
return success ? urlReferrer : null;
}
}
public Uri? Url => RequestUri;
public Version ProtocolVersion => _version;
public X509Certificate2? GetClientCertificate()
{
if (ClientCertState == ListenerClientCertState.InProgress)
throw new InvalidOperationException(SR.Format(SR.net_listener_callinprogress, $"{nameof(GetClientCertificate)}()/{nameof(BeginGetClientCertificate)}()"));
ClientCertState = ListenerClientCertState.InProgress;
GetClientCertificateCore();
ClientCertState = ListenerClientCertState.Completed;
if (NetEventSource.Log.IsEnabled()) NetEventSource.Info(this, $"_clientCertificate:{ClientCertificate}");
return ClientCertificate;
}
public IAsyncResult BeginGetClientCertificate(AsyncCallback? requestCallback, object? state)
{
if (NetEventSource.Log.IsEnabled()) NetEventSource.Info(this);
if (ClientCertState == ListenerClientCertState.InProgress)
throw new InvalidOperationException(SR.Format(SR.net_listener_callinprogress, $"{nameof(GetClientCertificate)}()/{nameof(BeginGetClientCertificate)}()"));
ClientCertState = ListenerClientCertState.InProgress;
return BeginGetClientCertificateCore(requestCallback, state);
}
public Task<X509Certificate2?> GetClientCertificateAsync()
{
return Task.Factory.FromAsync(
(callback, state) => ((HttpListenerRequest)state!).BeginGetClientCertificate(callback, state),
iar => ((HttpListenerRequest)iar.AsyncState!).EndGetClientCertificate(iar),
this);
}
internal ListenerClientCertState ClientCertState { get; set; } = ListenerClientCertState.NotInitialized;
internal X509Certificate2? ClientCertificate { get; set; }
public int ClientCertificateError
{
get
{
if (ClientCertState == ListenerClientCertState.NotInitialized)
throw new InvalidOperationException(SR.Format(SR.net_listener_mustcall, "GetClientCertificate()/BeginGetClientCertificate()"));
else if (ClientCertState == ListenerClientCertState.InProgress)
throw new InvalidOperationException(SR.Format(SR.net_listener_mustcompletecall, "GetClientCertificate()/BeginGetClientCertificate()"));
return GetClientCertificateErrorCore();
}
}
private static class Helpers
{
//
// Get attribute off header value
//
internal static string? GetCharSetValueFromHeader(string headerValue)
{
const string AttrName = "charset";
if (headerValue == null)
return null;
int l = headerValue.Length;
int k = AttrName.Length;
// find properly separated attribute name
int i = 1; // start searching from 1
while (i < l)
{
i = CultureInfo.InvariantCulture.CompareInfo.IndexOf(headerValue, AttrName, i, CompareOptions.IgnoreCase);
if (i < 0)
break;
if (i + k >= l)
break;
char chPrev = headerValue[i - 1];
char chNext = headerValue[i + k];
if ((chPrev == ';' || chPrev == ',' || char.IsWhiteSpace(chPrev)) && (chNext == '=' || char.IsWhiteSpace(chNext)))
break;
i += k;
}
if (i < 0 || i >= l)
return null;
// skip to '=' and the following whitespace
i += k;
while (i < l && char.IsWhiteSpace(headerValue[i]))
i++;
if (i >= l || headerValue[i] != '=')
return null;
i++;
while (i < l && char.IsWhiteSpace(headerValue[i]))
i++;
if (i >= l)
return null;
// parse the value
string? attrValue;
int j;
if (i < l && headerValue[i] == '"')
{
if (i == l - 1)
return null;
j = headerValue.IndexOf('"', i + 1);
if (j < 0 || j == i + 1)
return null;
attrValue = headerValue.AsSpan(i + 1, j - i - 1).Trim().ToString();
}
else
{
for (j = i; j < l; j++)
{
if (headerValue[j] == ';')
break;
}
if (j == i)
return null;
attrValue = headerValue.AsSpan(i, j - i).Trim().ToString();
}
return attrValue;
}
internal static string[]? ParseMultivalueHeader(string s)
{
if (s == null)
return null;
int l = s.Length;
// collect comma-separated values into list
List<string> values = new List<string>();
int i = 0;
while (i < l)
{
// find next ,
int ci = s.IndexOf(',', i);
if (ci < 0)
ci = l;
// append corresponding server value
values.Add(s.Substring(i, ci - i));
// move to next
i = ci + 1;
// skip leading space
if (i < l && s[i] == ' ')
i++;
}
// return list as array of strings
int n = values.Count;
string[] strings;
// if n is 0 that means s was empty string
if (n == 0)
{
strings = new string[1];
strings[0] = string.Empty;
}
else
{
strings = new string[n];
values.CopyTo(0, strings, 0, n);
}
return strings;
}
private static string UrlDecodeStringFromStringInternal(string s, Encoding e)
{
int count = s.Length;
UrlDecoder helper = new UrlDecoder(count, e);
// go through the string's chars collapsing %XX and %uXXXX and
// appending each char as char, with exception of %XX constructs
// that are appended as bytes
for (int pos = 0; pos < count; pos++)
{
char ch = s[pos];
if (ch == '+')
{
ch = ' ';
}
else if (ch == '%' && pos < count - 2)
{
if (s[pos + 1] == 'u' && pos < count - 5)
{
int h1 = HexConverter.FromChar(s[pos + 2]);
int h2 = HexConverter.FromChar(s[pos + 3]);
int h3 = HexConverter.FromChar(s[pos + 4]);
int h4 = HexConverter.FromChar(s[pos + 5]);
if ((h1 | h2 | h3 | h4) != 0xFF)
{ // valid 4 hex chars
ch = (char)((h1 << 12) | (h2 << 8) | (h3 << 4) | h4);
pos += 5;
// only add as char
helper.AddChar(ch);
continue;
}
}
else
{
int h1 = HexConverter.FromChar(s[pos + 1]);
int h2 = HexConverter.FromChar(s[pos + 2]);
if ((h1 | h2) != 0xFF)
{ // valid 2 hex chars
byte b = (byte)((h1 << 4) | h2);
pos += 2;
// don't add as char
helper.AddByte(b);
continue;
}
}
}
if ((ch & 0xFF80) == 0)
helper.AddByte((byte)ch); // 7 bit have to go as bytes because of Unicode
else
helper.AddChar(ch);
}
return helper.GetString();
}
private sealed class UrlDecoder
{
private readonly int _bufferSize;
// Accumulate characters in a special array
private int _numChars;
private readonly char[] _charBuffer;
// Accumulate bytes for decoding into characters in a special array
private int _numBytes;
private byte[]? _byteBuffer;
// Encoding to convert chars to bytes
private readonly Encoding _encoding;
private void FlushBytes()
{
if (_numBytes > 0)
{
_numChars += _encoding.GetChars(_byteBuffer!, 0, _numBytes, _charBuffer, _numChars);
_numBytes = 0;
}
}
internal UrlDecoder(int bufferSize, Encoding encoding)
{
_bufferSize = bufferSize;
_encoding = encoding;
_charBuffer = new char[bufferSize];
// byte buffer created on demand
}
internal void AddChar(char ch)
{
if (_numBytes > 0)
FlushBytes();
_charBuffer[_numChars++] = ch;
}
internal void AddByte(byte b)
{
_byteBuffer ??= new byte[_bufferSize];
_byteBuffer[_numBytes++] = b;
}
internal string GetString()
{
if (_numBytes > 0)
FlushBytes();
if (_numChars > 0)
return new string(_charBuffer, 0, _numChars);
else
return string.Empty;
}
}
internal static void FillFromString(NameValueCollection nvc, string s, bool urlencoded, Encoding encoding)
{
int i = s.StartsWith('?') ? 1 : 0;
int l = s.Length;
while (i < l)
{
// find next & while noting first = on the way (and if there are more)
int si = i;
int ti = -1;
while (i < l)
{
char ch = s[i];
if (ch == '=')
{
if (ti < 0)
ti = i;
}
else if (ch == '&')
{
break;
}
i++;
}
// extract the name / value pair
string? name = null;
string? value;
if (ti >= 0)
{
name = s.Substring(si, ti - si);
value = s.Substring(ti + 1, i - ti - 1);
}
else
{
value = s.Substring(si, i - si);
}
// add name / value pair to the collection
if (urlencoded)
nvc.Add(
name == null ? null : UrlDecodeStringFromStringInternal(name, encoding),
UrlDecodeStringFromStringInternal(value, encoding));
else
nvc.Add(name, value);
// trailing '&'
if (i == l - 1 && s[i] == '&')
nvc.Add(null, "");
i++;
}
}
}
}
}
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