/// <summary>
/// Returns the Uuid from a series of bytes
/// </summary>
/// <param name="bytes"></param>
/// <param name="offset"></param>
/// <returns></returns>
public static string BytesToUuid(AppendableByteArray bytes, int offset)
{
byte[] uuid = bytes.GetSubarray(offset, UUID_LEN);
ASCIIEncoding encoding = new ASCIIEncoding();
return encoding.GetString(uuid);
}
/// <summary>
/// Sets up the data in the header
/// </summary>
/// <param name="type"></param>
/// <param name="assetUUID"></param>
/// <param name="dataSize"></param>
private void SetupHeader(RequestType type, string assetUUID, int dataSize)
{
_data = new AppendableByteArray(HEADER_SIZE + dataSize);
_data.Append((byte)type);
_data.Append(Util.UuidToAscii(assetUUID));
_data.Append(BitConverter.GetBytes(IPAddress.HostToNetworkOrder(dataSize))); //size
}
/// <summary>
/// Returns the Uuid from a series of bytes
/// </summary>
/// <param name="bytes"></param>
/// <param name="offset"></param>
/// <returns></returns>
public static string BytesToUuid(AppendableByteArray bytes, int offset)
{
byte[] uuid = bytes.GetSubarray(offset, UUID_LEN);
ASCIIEncoding encoding = new ASCIIEncoding();
return(encoding.GetString(uuid));
}
/// <summary>
/// Initializes a new asset object with the given data
/// </summary>
/// <param name="dataSize"></param>
public Asset(AppendableByteArray data)
{
_uuid = Util.BytesToUuid(data, 0);
_type = data.data[TYPE_TAG_LOC];
_local = data.data[LOCAL_TAG_LOC] == 1;
_temporary = data.data[TEMPORARY_TAG_LOC] == 1;
_createTime = Util.NTOHL(data.data, CREATE_TIME_TAG_LOC);
//now the dynamic sized fields
UTF8Encoding encoding = new UTF8Encoding();
//the name field
byte nameFieldSize = data.data[NAME_SIZE_TAG_LOC];
if (nameFieldSize > 0)
{
_name = encoding.GetString(data.data, NAME_SIZE_TAG_LOC + 1, nameFieldSize);
}
else
{
_name = String.Empty;
}
//the description field
int descSizeFieldLoc = NAME_SIZE_TAG_LOC + nameFieldSize + 1;
byte descFieldSize = data.data[descSizeFieldLoc];
if (descFieldSize > 0)
{
_description = encoding.GetString(data.data, descSizeFieldLoc + 1, descFieldSize);
}
else
{
_description = String.Empty;
}
//finally, get the location of the data and it's size
int dataSizeFieldLoc = descSizeFieldLoc + descFieldSize + 1;
int dataSize = Util.NTOHL(data.data, dataSizeFieldLoc);
int dataLoc = dataSizeFieldLoc + 4;
//create the array now so that it will be shared between all reqestors
if (dataSize > 0)
{
_data = data.GetSubarray(dataLoc, dataSize);
}
else
{
_data = new byte[0];
}
}
/// <summary>
/// Initializes a new asset object with the given data
/// </summary>
/// <param name="dataSize"></param>
public Asset(AppendableByteArray data)
{
_uuid = Util.BytesToUuid(data, 0);
_type = data.data[TYPE_TAG_LOC];
_local = data.data[LOCAL_TAG_LOC] == 1;
_temporary = data.data[TEMPORARY_TAG_LOC] == 1;
_createTime = Util.NTOHL(data.data, CREATE_TIME_TAG_LOC);
//now the dynamic sized fields
UTF8Encoding encoding = new UTF8Encoding();
//the name field
byte nameFieldSize = data.data[NAME_SIZE_TAG_LOC];
if (nameFieldSize > 0)
{
_name = encoding.GetString(data.data, NAME_SIZE_TAG_LOC + 1, nameFieldSize);
}
else
{
_name = String.Empty;
}
//the description field
int descSizeFieldLoc = NAME_SIZE_TAG_LOC + nameFieldSize + 1;
byte descFieldSize = data.data[descSizeFieldLoc];
if (descFieldSize > 0)
{
_description = encoding.GetString(data.data, descSizeFieldLoc + 1, descFieldSize);
}
else
{
_description = String.Empty;
}
//finally, get the location of the data and it's size
int dataSizeFieldLoc = descSizeFieldLoc + descFieldSize + 1;
int dataSize = Util.NTOHL(data.data, dataSizeFieldLoc);
int dataLoc = dataSizeFieldLoc + 4;
//create the array now so that it will be shared between all reqestors
if (dataSize > 0)
{
_data = data.GetSubarray(dataLoc, dataSize);
}
else
{
_data = new byte[0];
}
}
public ServerResponseMsg(Socket conn)
{
//read the header
_header.AppendFromSocket(conn, HEADER_SIZE);
int intStatus = (int)_header.data[0];
if (intStatus < (int)Result.FOUND || intStatus > (int)Result.OK)
{
throw new AssetProtocolError("Invalid result type in server response: " + GetHeaderSummary());
}
//read the data
int dataSize = Util.NTOHL(_header.data, DATA_SZ_TAG_LOC);
if (dataSize > MAX_DATA_SIZE || dataSize < 0)
{
throw new AssetProtocolError("Returned data was too long in response: " + GetHeaderSummary());
}
_data = new AppendableByteArray(dataSize);
_data.AppendFromSocket(conn, dataSize);
}
/// <summary>
/// Constructs a new authentication response
/// </summary>
/// <param name="challenge">The challenge from the server</param>
/// <param name="password">The password for the server</param>
public AuthResponse(AuthChallenge challenge, string password)
{
//convert the password to ascii
ASCIIEncoding encoding = new ASCIIEncoding();
byte[] asciiPW = encoding.GetBytes(password);
//get data from the challenge
byte[] challengeBytes = challenge.Challenge;
//add the two ranges together and compute the hash
AppendableByteArray authString = new AppendableByteArray(asciiPW.Length + challengeBytes.Length);
authString.Append(asciiPW);
authString.Append(challengeBytes);
SHA1 sha = new SHA1CryptoServiceProvider();
byte[] challengeHash = sha.ComputeHash(authString.data);
//copy the results to the raw packet data
_rawMessageData.Append(PACKET_IDENTIFIER);
_rawMessageData.Append(encoding.GetBytes(Util.HashToHex(challengeHash)));
}
public AppendableByteArray Serialize()
{
UTF8Encoding encoding = new UTF8Encoding();
byte[] nameBytes = encoding.GetBytes(_name);
byte[] descBytes = encoding.GetBytes(_description);
if (nameBytes.Length > 255)
{
throw new AssetProtocolError(String.Format("Serialized asset name would be too long after encoding {0} {1}",
_name, _uuid));
}
if (descBytes.Length > 255)
{
throw new AssetProtocolError(String.Format("Serialized asset description would be too long after encoding {0} {1}",
_description, _uuid));
}
//see the packet diagram to understand where the size calculation is coming from
AppendableByteArray retArray
= new AppendableByteArray(HEADER_SIZE + 1 + nameBytes.Length + 1 + descBytes.Length + 4 + _data.Length);
retArray.Append(Util.UuidToAscii(_uuid));
retArray.Append((byte)_type);
retArray.Append((byte)(_local ? 1 : 0));
retArray.Append((byte)(_temporary ? 1 : 0));
retArray.Append(Util.HTONL(_createTime));
retArray.Append((byte)nameBytes.Length);
retArray.Append(nameBytes);
retArray.Append((byte)descBytes.Length);
retArray.Append(descBytes);
retArray.Append(Util.HTONL(_data.Length));
retArray.Append(_data);
return(retArray);
}
public ServerResponseMsg(Socket conn)
{
//read the header
_header.AppendFromSocket(conn, HEADER_SIZE);
int intStatus = (int)_header.data[0];
if (intStatus < (int)Result.FOUND || intStatus > (int)Result.OK)
{
throw new AssetProtocolError("Invalid result type in server response: " + GetHeaderSummary());
}
//read the data
int dataSize = Util.NTOHL(_header.data, DATA_SZ_TAG_LOC);
if (dataSize > MAX_DATA_SIZE || dataSize < 0)
{
throw new AssetProtocolError("Returned data was too long in response: " + GetHeaderSummary());
}
_data = new AppendableByteArray(dataSize);
_data.AppendFromSocket(conn, dataSize);
}
/// <summary>
/// Constructs a new authentication response
/// </summary>
/// <param name="challenge">The challenge from the server</param>
/// <param name="password">The password for the server</param>
public AuthResponse(AuthChallenge challenge, string password)
{
//convert the password to ascii
ASCIIEncoding encoding = new ASCIIEncoding();
byte[] asciiPW = encoding.GetBytes(password);
//get data from the challenge
byte[] challengeBytes = challenge.Challenge;
//add the two ranges together and compute the hash
AppendableByteArray authString = new AppendableByteArray(asciiPW.Length + challengeBytes.Length);
authString.Append(asciiPW);
authString.Append(challengeBytes);
SHA1 sha = new SHA1CryptoServiceProvider();
byte[] challengeHash = sha.ComputeHash(authString.data);
//copy the results to the raw packet data
_rawMessageData.Append(PACKET_IDENTIFIER);
_rawMessageData.Append(encoding.GetBytes(Util.HashToHex(challengeHash)));
}
public AppendableByteArray Serialize()
{
UTF8Encoding encoding = new UTF8Encoding();
byte[] nameBytes = encoding.GetBytes(_name);
byte[] descBytes = encoding.GetBytes(_description);
if (nameBytes.Length > 255)
{
throw new AssetProtocolError(String.Format("Serialized asset name would be too long after encoding {0} {1}",
_name, _uuid));
}
if (descBytes.Length > 255)
{
throw new AssetProtocolError(String.Format("Serialized asset description would be too long after encoding {0} {1}",
_description, _uuid));
}
//see the packet diagram to understand where the size calculation is coming from
AppendableByteArray retArray
= new AppendableByteArray(HEADER_SIZE + 1 + nameBytes.Length + 1 + descBytes.Length + 4 + _data.Length);
retArray.Append(Util.UuidToAscii(_uuid));
retArray.Append((byte)_type);
retArray.Append((byte)(_local ? 1 : 0));
retArray.Append((byte)(_temporary ? 1 : 0));
retArray.Append(Util.HTONL(_createTime));
retArray.Append((byte)nameBytes.Length);
retArray.Append(nameBytes);
retArray.Append((byte)descBytes.Length);
retArray.Append(descBytes);
retArray.Append(Util.HTONL(_data.Length));
retArray.Append(_data);
return retArray;
}
/// <summary>
/// Sets up the data in the header
/// </summary>
/// <param name="type"></param>
/// <param name="assetUUID"></param>
/// <param name="dataSize"></param>
private void SetupHeader(RequestType type, string assetUUID, int dataSize)
{
_data = new AppendableByteArray(HEADER_SIZE + dataSize);
_data.Append((byte)type);
_data.Append(Util.UuidToAscii(assetUUID));
_data.Append(BitConverter.GetBytes(IPAddress.HostToNetworkOrder(dataSize))); //size
}
