/// <summary>
/// Marshals an entry into a byte[] to be sent to restAPI
/// </summary>
/// <param name="e">Entry to be marshaled</param>
/// <returns>Marshaled entry</returns>
public static byte[] MarshalBinary(DataStructs.EntryData e)
{
var entryBStruct = new List <byte>();
var idsSize = MarshalExtIDsSize(e);
idsSize = Bytes.CheckEndian(idsSize);
// Header
// 1 byte version
byte version = 0;
entryBStruct.Add(version);
// 32 byte chainid
var chain = e.ChainId;
entryBStruct.AddRange(chain);
// Ext Ids Size
entryBStruct.AddRange(idsSize);
// Payload
// ExtIDS
if (e.ExtIDs != null)
{
var ids = MarshalExtIDsBinary(e);
entryBStruct.AddRange(ids);
}
// Content
var content = e.Content;
entryBStruct.AddRange(content);
return(entryBStruct.ToArray());
}
/// <summary>
/// Constructs a new EntryData object
/// </summary>
/// <param name="content">Content of Entry (message pack)</param>
/// <param name="extIds">Unique Ids used for first entry of chain to construct a unique chain ID</param>
/// <param name="chainId">ChainID of chain</param>
/// <returns>EntryData object</returns>
public static DataStructs.EntryData NewEntry(byte[] content, byte[][] extIds, byte[] chainId)
{
var entry = new DataStructs.EntryData();
entry.Content = content;
entry.ExtIDs = extIds;
entry.ChainId = chainId;
return(entry);
}
/// <summary>
/// Gets a hash of an entry
/// </summary>
/// <param name="entry">EntryData to be hashed</param>
/// <returns>Hash of entry</returns>
public static byte[] HashEntry(DataStructs.EntryData entry)
{
var data = MarshalBinary(entry);
var h1 = SHA512.Create().ComputeHash(data);
var h2 = new byte[h1.Length + data.Length];
h1.CopyTo(h2, 0);
data.CopyTo(h2, h1.Length);
var h3 = SHA256.Create().ComputeHash(h2);
return(h3);
}
/// <summary>
/// Passing the first entry of a Chain will get the chainId of that entry. Needs the ExtIDs to do this successfully
/// </summary>
/// <param name="entry">Entry object</param>
/// <returns>ChainID</returns>
public static byte[] ChainIdOfFirstEntry(DataStructs.EntryData entry)
{
var byteList = new List <byte>();
foreach (var ext in entry.ExtIDs)
{
byteList.AddRange(SHA256.Create().ComputeHash(ext));
}
var b = byteList.ToArray();
var chainInfo = SHA256.Create().ComputeHash(b);
return(chainInfo);
}
/// <summary>
/// Helper function of MarshalBinary
/// </summary>
/// <param name="e"></param>
/// <returns></returns>
private static byte[] MarshalExtIDsBinary(DataStructs.EntryData e)
{
var byteList = new List <byte>();
foreach (var exId in e.ExtIDs)
{
// 2 byte size of ExtID
var extLen = Convert.ToInt16(exId.Length);
var bytes = BitConverter.GetBytes(extLen);
bytes = Bytes.CheckEndian(bytes);
byteList.AddRange(bytes);
var extIdStr = exId;
byteList.AddRange(extIdStr);
}
return(byteList.ToArray());
}
/// <summary>
/// Commits an entry to the Factom blockchain. Must wait 10 seconds if succeeds then call RevealEntry
/// </summary>
/// <param name="entry">Entry to be committed</param>
/// <param name="name">Name of entry credit wallet</param>
/// <returns>ChainID of commited Entry</returns>
public static byte[] CommitEntry(DataStructs.EntryData entry, string name)
{
var byteList = new List <byte>();
// 1 byte version
byteList.Add(0);
// 6 byte milliTimestamp (truncated unix time)
byteList.AddRange(Times.MilliTime());
// 32 byte Entry Hash
byteList.AddRange(Entries.HashEntry(entry));
// 1 byte number of entry credits to pay
var cost = EntryCost(entry); // TODO: check errors
byteList.Add(BitConverter.GetBytes(cost)[0]);
var com = new WallerCommit();
com.Message = Arrays.ByteArrayToHex(byteList.ToArray()); //Hex encoded string on bytelist
var json = JsonConvert.SerializeObject(com);
Console.WriteLine("CE Json = " + json); //TODO: Remove
var req = new RestRequest("/commit-entry/{name}", Method.POST);
req.RequestFormat = DataFormat.Json;
req.AddParameter("application/json", json, ParameterType.RequestBody);
req.AddUrlSegment("name", name);
var resp = StaticValues.clientD.Execute(req);
if (resp.StatusCode != HttpStatusCode.OK)
{
throw new FactomEntryException("Entry Commit Failed. Message: " + resp.ErrorMessage);
}
//Console.WriteLine("CommitEntry Resp = " + resp.StatusCode + "|" + resp.StatusCode);
if (entry.ExtIDs != null)
{
return(Entries.ChainIdOfFirstEntry(entry));
}
return(entry.ChainId);
}
/// <summary>
/// Creates a new Chain
/// </summary>
/// <param name="entry">First entry in chain</param>
/// <returns></returns>
public static ChainType NewChain(DataStructs.EntryData entry)
{
var c = new ChainType();
c.FirstEntry = entry;
var chainHash = new List <byte>();
if (entry.ExtIDs != null)
{
foreach (var extId in entry.ExtIDs)
{
var h = SHA256.Create().ComputeHash(extId);
chainHash.AddRange(h);
}
}
c.ChainId = SHA256.Create().ComputeHash(chainHash.ToArray());
c.FirstEntry.ChainId = c.ChainId;
return(c);
}
/// <summary>
/// Caculates the cost of an entry
/// </summary>
/// <param name="entry"></param>
/// <returns></returns>
public static sbyte EntryCost(DataStructs.EntryData entry)
{
var entryBinary = Entries.MarshalBinary(entry);
var len = entryBinary.Length - 35;
if (len > 10240)
{
//Error, cannot be larger than 10kb
throw new ArgumentException("Parameter cannot exceed 10kb of content", nameof(entry));
}
var r = len % 1024;
var n = (sbyte)(len / 1024); // Capacity of Entry Payment
if (r > 0)
{
n += 1;
}
if (n < 1)
{
n = 1;
}
return(n);
}
/// <summary>
/// Second and final step in adding an entry to a chain on the factom blockchain
/// </summary>
/// <param name="entry">Entry to be added</param>
/// <returns>Boolean true/false for success/failure</returns>
public static bool RevealEntry(DataStructs.EntryData entry)
{
var rev = new Reveal();
var marshaledEntry = Entries.MarshalBinary(entry);
rev.Entry = Arrays.ByteArrayToHex(marshaledEntry);
var req = new RestRequest("/reveal-entry/", Method.POST);
var json = JsonConvert.SerializeObject(rev);
Console.WriteLine("RE Json = " + json);
req.RequestFormat = DataFormat.Json;
req.AddParameter("application/json", json, ParameterType.RequestBody);
IRestResponse resp = StaticValues.clientWallet.Execute <RestRequest>(req);
Console.WriteLine("RevealEntry Resp = " + resp.StatusCode + "|" + resp.StatusCode);
if (resp.StatusCode != HttpStatusCode.OK)
{
throw new FactomEntryException("Entry Reveal Failed. Message: " + resp.ErrorMessage);
}
return(true);
}
/// <summary>
/// Helper function of MarshalBinary
/// </summary>
/// <param name="e"></param>
/// <returns></returns>
private static byte[] MarshalExtIDsSize(DataStructs.EntryData e)
{
if (e.ExtIDs == null)
{
short extLen = 0;
var bytes = BitConverter.GetBytes(extLen);
return(Bytes.CheckEndian(bytes));
}
else
{
var totalSize = 0;
foreach (var extElement in e.ExtIDs)
{
totalSize += extElement.Length + 2;
}
var extLen = Convert.ToInt16(totalSize);
var bytes = BitConverter.GetBytes(extLen);
return(bytes);
// return Bytes.CheckEndian(bytes);
}
}
/// <summary>
/// Constructs a new EntryData object
/// </summary>
/// <param name="content">Content of Entry (message pack)</param>
/// <param name="extIds">Unique Ids used for first entry of chain to construct a unique chain ID</param>
/// <param name="chainId">ChainID of chain</param>
/// <returns>EntryData object</returns>
public static DataStructs.EntryData NewEntry(byte[] content, byte[][] extIds, byte[] chainId)
{
var entry = new DataStructs.EntryData();
entry.Content = content;
entry.ExtIDs = extIds;
entry.ChainId = chainId;
return entry;
}
