/// <summary>
/// Creates CAN IPNS record object to point to a CAN object of the given hash with the given sequence number.
/// </summary>
/// <param name="Hash">Hash of the CAN object to point IPNS record to.</param>
/// <param name="SequenceNumber">Sequence number of the IPNS record.</param>
/// <param name="ExpirationTimeSeconds">Expiration time of the newly created record in seconds.</param>
/// <returns>Valid signed CAN IPNS record object, ready to be sent to CAN server.</returns>
public static CanIpnsEntry CreateIpnsRecord(byte[] Hash, UInt64 SequenceNumber, int ExpirationTimeSeconds)
{
log.Trace("(Hash:'{0}',SequenceNumber:{1},ExpirationTimeSeconds:{2})", Hash.ToBase58(), SequenceNumber, ExpirationTimeSeconds);
string validityString = DateTime.UtcNow.AddMonths(1).ToString(Rfc3339DateTimeFormat, DateTimeFormatInfo.InvariantInfo);
byte[] validityBytes = Encoding.UTF8.GetBytes(validityString);
UInt64 ttlNanoSec = (UInt64)(TimeSpan.FromSeconds(ExpirationTimeSeconds).TotalMilliseconds) * (UInt64)1000000;
string valueString = CanApi.CreateIpfsPathFromHash(Hash);
byte[] valueBytes = Encoding.UTF8.GetBytes(valueString);
CanIpnsEntry res = new CanIpnsEntry()
{
Sequence = SequenceNumber,
ValidityType = CanIpnsEntry.Types.ValidityType.Eol,
Ttl = ttlNanoSec,
Validity = ProtocolHelper.ByteArrayToByteString(validityBytes),
Value = ProtocolHelper.ByteArrayToByteString(valueBytes)
};
res.Signature = ProtocolHelper.ByteArrayToByteString(CreateIpnsRecordSignature(res));
log.Trace("(-):{0}", res);
return(res);
}
/// <summary>
/// Refreshes server's IPNS record in CAN.
/// </summary>
/// <param name="IpnsRecord">IPNS record to refresh.</param>
/// <param name="PublicKey">Public key of the IPNS record owner.</param>
/// <returns>Structure describing whether the function succeeded and response provided by CAN server.</returns>
public async Task <CanRefreshIpnsResult> RefreshIpnsRecord(CanIpnsEntry IpnsRecord, byte[] PublicKey)
{
log.Trace("(PublicKey:'{0}')", PublicKey.ToHex());
string ipnsRecordEncoded = IpnsRecord.ToByteArray().ToBase64UrlPad(true);
CanCryptoKey cryptoKey = new CanCryptoKey()
{
Type = CanCryptoKey.Types.KeyType.Ed25519,
Data = ProtocolHelper.ByteArrayToByteString(PublicKey)
};
string keyEncoded = Base58Encoding.Encoder.Encode(cryptoKey.ToByteArray());
log.Debug("Encoding public key: {0}", keyEncoded);
NameValueCollection args = new NameValueCollection();
args.Add("arg", ipnsRecordEncoded);
args.Add("key", keyEncoded);
CanApiResult apiResult = await SendRequest("name/upload", args);
CanRefreshIpnsResult res = CanRefreshIpnsResult.FromApiResult(apiResult);
if (res.Success)
{
res.IsCanError = false;
// Check that the ID, path and sequence number match what we expect.
string canId = CanApi.PublicKeyToId(PublicKey).ToBase58();
if (res.Details.Peer == canId)
{
string path = Encoding.UTF8.GetString(IpnsRecord.Value.ToByteArray());
if (res.Details.NewPath == path)
{
if (res.Details.NewSeq == IpnsRecord.Sequence)
{
// All OK.
}
else
{
log.Warn("CAN sequence is {0}, received {1}.", IpnsRecord.Sequence, res.Details.NewSeq);
res.Success = false;
res.Message = "CAN path in response does not match expected value.";
}
}
else
{
log.Warn("CAN path is '{0}', received '{1}'.", path, res.Details.NewPath);
res.Success = false;
res.Message = "CAN path in response does not match expected value.";
}
}
else
{
log.Warn("CAN ID is '{0}', received '{1}'.", canId, res.Details.Peer);
res.Success = false;
res.Message = "CAN ID in response does not match expected value.";
}
}
if (res.Success)
{
log.Trace("(-):*.Success={0}", res.Success);
}
else
{
log.Trace("(-):*.Success={0},*.IsCanError={1},*.Message='{2}'", res.Success, res.IsCanError, res.Message);
}
return(res);
}
/// <summary>
/// Deletes CAN object from CAN server.
/// </summary>
/// <param name="ObjectHash">CAN object hash.</param>
/// <returns>Structure describing whether the function succeeded and response provided by CAN server.</returns>
public async Task <CanDeleteResult> CanDeleteObjectByHash(byte[] ObjectHash)
{
string objectPath = CanApi.CreateIpfsPathFromHash(ObjectHash);
return(await CanDeleteObject(objectPath));
}
