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using System;
using System.Globalization;
using System.Text;
using WebSocketState = System.Net.WebSockets.WebSocketState;
namespace SocketHttpListener.Net.WebSockets
{
internal static partial class WebSocketValidate
{
internal const int MaxControlFramePayloadLength = 123;
private const int CloseStatusCodeAbort = 1006;
private const int CloseStatusCodeFailedTLSHandshake = 1015;
private const int InvalidCloseStatusCodesFrom = 0;
private const int InvalidCloseStatusCodesTo = 999;
private const string Separators = "()<>@,;:\\\"/[]?={} ";
internal static void ThrowIfInvalidState(WebSocketState currentState, bool isDisposed, WebSocketState[] validStates)
{
string validStatesText = string.Empty;
if (validStates != null && validStates.Length > 0)
{
foreach (WebSocketState validState in validStates)
{
if (currentState == validState)
{
// Ordering is important to maintain .NET 4.5 WebSocket implementation exception behavior.
if (isDisposed)
{
throw new ObjectDisposedException(nameof(WebSocket));
}
return;
}
}
validStatesText = string.Join(", ", validStates);
}
throw new WebSocketException("net_WebSockets_InvalidState");
}
internal static void ValidateSubprotocol(string subProtocol)
{
if (string.IsNullOrWhiteSpace(subProtocol))
{
throw new ArgumentException("net_WebSockets_InvalidEmptySubProtocol");
}
string invalidChar = null;
int i = 0;
while (i < subProtocol.Length)
{
char ch = subProtocol[i];
if (ch < 0x21 || ch > 0x7e)
{
invalidChar = string.Format(CultureInfo.InvariantCulture, "[{0}]", (int)ch);
break;
}
if (!char.IsLetterOrDigit(ch) &&
Separators.IndexOf(ch) >= 0)
{
invalidChar = ch.ToString();
break;
}
i++;
}
if (invalidChar != null)
{
throw new ArgumentException("net_WebSockets_InvalidCharInProtocolString");
}
}
internal static void ValidateCloseStatus(WebSocketCloseStatus closeStatus, string statusDescription)
{
if (closeStatus == WebSocketCloseStatus.Empty && !string.IsNullOrEmpty(statusDescription))
{
throw new ArgumentException("net_WebSockets_ReasonNotNull");
}
int closeStatusCode = (int)closeStatus;
if ((closeStatusCode >= InvalidCloseStatusCodesFrom &&
closeStatusCode <= InvalidCloseStatusCodesTo) ||
closeStatusCode == CloseStatusCodeAbort ||
closeStatusCode == CloseStatusCodeFailedTLSHandshake)
{
// CloseStatus 1006 means Aborted - this will never appear on the wire and is reflected by calling WebSocket.Abort
throw new ArgumentException("net_WebSockets_InvalidCloseStatusCode");
}
int length = 0;
if (!string.IsNullOrEmpty(statusDescription))
{
length = Encoding.UTF8.GetByteCount(statusDescription);
}
if (length > MaxControlFramePayloadLength)
{
throw new ArgumentException("net_WebSockets_InvalidCloseStatusDescription");
}
}
internal static void ValidateArraySegment(ArraySegment<byte> arraySegment, string parameterName)
{
if (arraySegment.Array == null)
{
throw new ArgumentNullException(parameterName + "." + nameof(arraySegment.Array));
}
if (arraySegment.Offset < 0 || arraySegment.Offset > arraySegment.Array.Length)
{
throw new ArgumentOutOfRangeException(parameterName + "." + nameof(arraySegment.Offset));
}
if (arraySegment.Count < 0 || arraySegment.Count > (arraySegment.Array.Length - arraySegment.Offset))
{
throw new ArgumentOutOfRangeException(parameterName + "." + nameof(arraySegment.Count));
}
}
internal static void ValidateBuffer(byte[] buffer, int offset, int count)
{
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer));
}
if (offset < 0 || offset > buffer.Length)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
if (count < 0 || count > (buffer.Length - offset))
{
throw new ArgumentOutOfRangeException(nameof(count));
}
}
}
}
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