private static bool IsAppProtocolVersionValid(
Peer remotePeer,
AppProtocolVersion localVersion,
AppProtocolVersion remoteVersion,
IImmutableSet <PublicKey> trustedAppProtocolVersionSigners,
DifferentAppProtocolVersionEncountered differentAppProtocolVersionEncountered)
{
if (remoteVersion.Equals(localVersion))
{
return(true);
}
if (!(trustedAppProtocolVersionSigners is null) &&
!trustedAppProtocolVersionSigners.Any(remoteVersion.Verify))
{
return(false);
}
if (differentAppProtocolVersionEncountered is null)
{
return(false);
}
return(differentAppProtocolVersionEncountered(remotePeer, remoteVersion, localVersion));
}
private static void ValidateAppProtocolVersionTemplate(
AppProtocolVersion appProtocolVersion,
IImmutableSet <PublicKey>?trustedAppProtocolVersionSigners,
DifferentAppProtocolVersionEncountered?differentAppProtocolVersionEncountered,
Peer peer,
byte[] identity,
AppProtocolVersion peerAppProtocolVersion)
{
if (peerAppProtocolVersion.Equals(appProtocolVersion))
{
return;
}
bool trusted = !(
trustedAppProtocolVersionSigners is { } tapvs&&
tapvs.All(publicKey => !peerAppProtocolVersion.Verify(publicKey)));
if (trusted && differentAppProtocolVersionEncountered is { } dapve)
{
dapve(peer, peerAppProtocolVersion, appProtocolVersion);
}
throw new DifferentAppProtocolVersionException(
$"The APV of a received message is invalid; " +
$"Local: APV {appProtocolVersion} " +
$"with signature {ByteUtil.Hex(appProtocolVersion.Signature)} " +
$"by signer {appProtocolVersion.Signer}\n" +
$"Remote: APV {peerAppProtocolVersion} " +
$"with signature {ByteUtil.Hex(peerAppProtocolVersion.Signature)} " +
$"by signer {peerAppProtocolVersion.Signer}\n" +
$"Signed by a trusted signer: {trusted}",
peer,
identity,
appProtocolVersion,
peerAppProtocolVersion,
trusted);
}