// Creates genesis block if no block if found in the blockchain
public void InitializeBlockchain()
{
if (_blockchainDataAccess.FindLast() == null)
{
_blockchainDataAccess.Insert(new Block(0.ToString(), "{'type':'Genesis block'}"));
}
}
// Creates, encrypts and saves a new contract in the database as block
// Currently not used - implementation pending
public void ConcludeContract(Contract contract)
{
// Parse contract into json string
var jsonToString = JsonConvert.SerializeObject(contract);
// Encrypt string
var encryptedData = CryptographyService.Encrypt(jsonToString);
var encryptedContract = encryptedData[0];
var secretKey = encryptedData[1];
// Save block in the database
var lastBlock = _blockchainDataAccess.FindLast();
var lastBlockIndex = lastBlock.Index;
var lastBlockHash = lastBlock.Hash;
var newBlockIndex = (Convert.ToInt64(lastBlockIndex) + 1).ToString();
_blockchainDataAccess.Insert(new Block(newBlockIndex, encryptedContract, lastBlockHash));
// Encrypt and send the secret key to all users included in the contract
var signatures = (List <dynamic>)contract.Essentials["signatures"];
foreach (var signature in signatures.Select(hashMap => (Dictionary <string, dynamic>)hashMap))
{
foreach (var(key, value) in signature)
{
if (!key.Equals("signer") && !key.Equals("onBehalfOf"))
{
continue;
}
var encryptedSecret = CryptographyService.EncryptWithPublicKey(secretKey, (string)value);
var userToBeUpdated = _usersDataAccess.FindByPublicKey((string)value);
var userCorrespondingIndices = userToBeUpdated.CorrespondingIndices;
userCorrespondingIndices[newBlockIndex] = encryptedSecret;
_usersDataAccess.Update(userToBeUpdated);
}
}
}
