public void RegisterExtension(IWebSocketExtension extension)
{
if (extension == null)
throw new ArgumentNullException("extension");
if (_extensions.Contains(extension))
throw new ArgumentException(ErrorMessages.ExtensionsAlreadyRegistered + extension.Name, "extension");
var oldState = Interlocked.CompareExchange(ref _state, _state, _state);
if (oldState != WebSocketState.Closed)
throw new InvalidOperationException(ErrorMessages.InvalidState + _state);
_extensions.Add(extension);
}
public void RegisterExtension(IWebSocketExtension extension)
{
if (extension == null)
{
throw new ArgumentNullException("extension");
}
if (_extensions.Contains(extension))
{
throw new ArgumentException(ErrorMessages.ExtensionsAlreadyRegistered + extension.Name, "extension");
}
var oldState = Interlocked.CompareExchange(ref _state, _state, _state);
if (oldState != WebSocketState.Closed)
{
throw new InvalidOperationException(ErrorMessages.InvalidState + _state);
}
_extensions.Add(extension);
}
public void AddExtension(IWebSocketExtension extension)
{
if (extension == null)
{
throw new ArgumentNullException("extension");
}
var value = new StringBuilder(extension.Name);
if (extension.Parameter != null)
{
value.AppendFormat("; {0}", extension.Parameter.Key);
if (!string.IsNullOrWhiteSpace(extension.Parameter.Value))
{
var param = extension.Parameter.Value;
var fmt = param.IndexOfAny(Consts.ExtensionParmeterValueNeedQuotesChars) < 0 || param.StartsAndEndsWith("\"")
? "={0}"
: "=\"{0}\"";
value.AppendFormat(fmt, param);
}
}
this.AddHeader(Consts.HeaderSecWebSocketExtensions, value.ToString());
}
public bool NegotiateAsServer(string offer, out string invalidParameter, out IWebSocketExtension negotiatedExtension)
{
return(Negotiate(offer, AgreeAsServer, out invalidParameter, out negotiatedExtension));
}
private bool Negotiate(string offer, Func <AgreedExtensionParameter, bool> agree, out string invalidParameter, out IWebSocketExtension negotiatedExtension)
{
invalidParameter = null;
negotiatedExtension = null;
if (string.IsNullOrWhiteSpace(offer))
{
invalidParameter = offer;
return(false);
}
var segements = offer.Replace('\r', ' ').Replace('\n', ' ').TrimStart(TrimableChars).TrimEnd(TrimableChars).Split(';');
var offeredExtensionName = segements[0].TrimStart(TrimableChars).TrimEnd(TrimableChars);
if (string.IsNullOrEmpty(offeredExtensionName))
{
invalidParameter = offer;
return(false);
}
if (string.Compare(offeredExtensionName, PerMessageCompressionExtension.RegisteredToken, StringComparison.OrdinalIgnoreCase) != 0)
{
invalidParameter = offeredExtensionName;
return(false);
}
if (segements.Length == 1)
{
negotiatedExtension = new PerMessageCompressionExtension();
return(true);
}
// This set of elements MAY include multiple PMCEs with the same extension
// name to offer the possibility to use the same algorithm with
// different configuration parameters.
for (int i = 1; i < segements.Length; i++)
{
var offeredParameter = segements[i];
if (!PerMessageCompressionExtensionParameters.ValidateParameter(offeredParameter))
{
invalidParameter = offeredParameter;
return(false);
}
}
// The order of elements is important as it specifies the client's preference.
// An element preceding another element has higher preference. It is recommended
// that a server accepts PMCEs with higher preference if the server supports them.
var agreedSet = new SortedList <int, AgreedExtensionParameter>();
for (int i = 1; i < segements.Length; i++)
{
var offeredParameter = segements[i];
var agreeingParameter = PerMessageCompressionExtensionParameters.ResolveParameter(offeredParameter);
if (agree(agreeingParameter))
{
agreedSet.Add(i, agreeingParameter);
}
}
negotiatedExtension = new PerMessageCompressionExtension(agreedSet);
return(true);
}
public bool NegotiateAsServer(string offer, out string invalidParameter, out IWebSocketExtension negotiatedExtension)
{
return Negotiate(offer, AgreeAsServer, out invalidParameter, out negotiatedExtension);
}
private bool Negotiate(string offer, Func<AgreedExtensionParameter, bool> agree, out string invalidParameter, out IWebSocketExtension negotiatedExtension)
{
invalidParameter = null;
negotiatedExtension = null;
if (string.IsNullOrWhiteSpace(offer))
{
invalidParameter = offer;
return false;
}
var segements = offer.Replace('\r', ' ').Replace('\n', ' ').TrimStart(TrimableChars).TrimEnd(TrimableChars).Split(';');
var offeredExtensionName = segements[0].TrimStart(TrimableChars).TrimEnd(TrimableChars);
if (string.IsNullOrEmpty(offeredExtensionName))
{
invalidParameter = offer;
return false;
}
if (string.Compare(offeredExtensionName, PerMessageCompressionExtension.RegisteredToken, StringComparison.OrdinalIgnoreCase) != 0)
{
invalidParameter = offeredExtensionName;
return false;
}
if (segements.Length == 1)
{
negotiatedExtension = new PerMessageCompressionExtension();
return true;
}
// This set of elements MAY include multiple PMCEs with the same extension
// name to offer the possibility to use the same algorithm with
// different configuration parameters.
for (int i = 1; i < segements.Length; i++)
{
var offeredParameter = segements[i];
if (!PerMessageCompressionExtensionParameters.ValidateParameter(offeredParameter))
{
invalidParameter = offeredParameter;
return false;
}
}
// The order of elements is important as it specifies the client's preference.
// An element preceding another element has higher preference. It is recommended
// that a server accepts PMCEs with higher preference if the server supports them.
var agreedSet = new SortedList<int, AgreedExtensionParameter>();
for (int i = 1; i < segements.Length; i++)
{
var offeredParameter = segements[i];
var agreeingParameter = PerMessageCompressionExtensionParameters.ResolveParameter(offeredParameter);
if (agree(agreeingParameter))
{
agreedSet.Add(i, agreeingParameter);
}
}
negotiatedExtension = new PerMessageCompressionExtension(agreedSet);
return true;
}
public void AddExtension(IWebSocketExtension extension)
{
if (extension == null)
throw new ArgumentNullException("extension");
var value = new StringBuilder(extension.Name);
if (extension.Parameter != null)
{
value.AppendFormat("; {0}", extension.Parameter.Key);
if (!string.IsNullOrWhiteSpace(extension.Parameter.Value))
{
var param = extension.Parameter.Value;
var fmt = param.IndexOfAny(Consts.ExtensionParmeterValueNeedQuotesChars) < 0 || param.StartsAndEndsWith("\"")
? "={0}"
: "=\"{0}\"";
value.AppendFormat(fmt, param);
}
}
this.AddHeader(Consts.HeaderSecWebSocketExtensions, value.ToString());
}
