public static void Validate(this BlockChain blockChain, IWorkContext context, IPrincipleSignatureContainer keyContainer)
{
blockChain.Verify(nameof(blockChain)).IsNotNull();
keyContainer.Verify(nameof(keyContainer)).IsNotNull();
blockChain.IsValid()
.Verify()
.Assert <bool, SecurityException>(x => x == true, "Block chain has linkage is invalid");
foreach (var node in blockChain.Blocks)
{
// Skip header
if (node.Index == 0)
{
continue;
}
string?issuer = JwtTokenParser.GetIssuerFromJwtToken(node.BlockData.JwtSignature !) !
.Verify()
.Assert <string, SecurityException>(x => x != null, "Issuer is not found in JWT Signature")
.Value;
PrincipleSignature principleSignature = keyContainer.Get(issuer !) !;
principleSignature.Verify().IsNotNull("Signature for issuer {issuer} is not in container");
node.BlockData.Validate(context, principleSignature);
}
}
public static Stream ToZipContainer(this BlockChain blockChain, IWorkContext context)
{
blockChain.Verify(nameof(blockChain)).IsNotNull();
blockChain.IsValid().Verify().Assert(x => x == true, "Block chain is not valid");
var writeMemoryBuffer = new MemoryStream();
using var writer = new ZipContainerWriter(new ZipArchive(writeMemoryBuffer, ZipArchiveMode.Create, leaveOpen: true));
try
{
string blockChainHash = blockChain.ToMerkleTree().BuildTree().ToString();
writer.Write(context, _merkleTreeHash, blockChainHash);
string json = blockChain.ToJson();
writer.Write(context, _zipPath, json);
}
finally
{
writer.Close();
}
writeMemoryBuffer.Length.Verify().Assert(x => x > 0, "ZipContainer memory buffer length is zero");
writeMemoryBuffer.Seek(0, SeekOrigin.Begin);
return(writeMemoryBuffer);
}
public static BlockChain ToBlockChain(this Stream readFromStream, IWorkContext context)
{
readFromStream.Verify(nameof(readFromStream)).IsNotNull();
using var reader = new ZipContainerReader(new ZipArchive(readFromStream, ZipArchiveMode.Read));
string readJson = reader.Read(context, _zipPath);
string blockChainHash = reader.Read(context, _merkleTreeHash);
BlockChain result = readJson.ToBlockChain();
result.IsValid().Verify().Assert(x => x == true, "Read block chain is invalid");
string resultChainHash = result.ToMerkleTree().BuildTree().ToString();
(blockChainHash == resultChainHash).Verify().Assert(x => x == true, "Merkle hash does not match, block chain is invalid");
return(result);
}
