public ClientCaps(ICapsStorage capsStorage)
{
var myDiscoInfo = DiscoInfo;
capsHash = Caps.BuildHash(myDiscoInfo);
// lets store our own caps as well
if (!capsStorage.HasCapability(capsHash))
{
capsStorage.AddCapability(capsHash, myDiscoInfo.ToString());
}
}
public CapsCollectionHandler(ICapsStorage capsStorage)
{
Handle(
el =>
el.OfType <Presence>(),
async(context, xmppXElement) =>
{
var pres = xmppXElement.Cast <Presence>();
var caps = pres.Caps;
if (caps != null &&
caps.Hash != null && // old style caps has no hash attribute, we ignore old style caps
!capsStorage.HasCapability(caps.Version))
{
try
{
var discoResult = await this.DiscoverInformationAsync(pres.From, caps.Node + "#" + caps.Version);
if (discoResult.Type == IqType.Result)
{
if (discoResult.Query.OfType <Info>())
{
var info = discoResult.Query as Info;
// check if Hash is correct
if (caps.HashAlgorithm != Matrix.Crypt.HashAlgorithms.Unknown)
{
try
{
var validateHash = Caps.BuildHash(info, caps.HashAlgorithm);
if (validateHash == caps.Version && !capsStorage.HasCapability(caps.Version))
{
capsStorage.AddCapability(caps.Version, info.ToString(true));
}
else
{
// wrong hash, malicious or broken client
// ignore or log
}
}
catch (Exception)
{
// could crash because of not supported Hash algorithm by the platform
// ignore
}
}
else
{
if (caps.Version != null && !capsStorage.HasCapability(caps.Version))
{
capsStorage.AddCapability(caps.Version, info.ToString(true));
}
}
}
}
}
catch (Exception)
{
// ignore, eg timeouts
}
}
});
}
