/// <summary>
/// constructor with params.
/// actual object should be passed.
/// </summary>
/// <param name="encryptdecrypt">
/// used for encrypt/decrypt.
/// should be valid object.
/// </param>
/// <param name="netStream">
/// used for network communication.
/// should be valid object AND connected to host.
/// </param>
/// <exception cref="ArgumentNullException">
/// thrown when <paramref name="encryptdecrypt"/> is null
/// </exception>
/// <exception cref="ArgumentNullException">
/// thrown when <paramref name="netStream"/> is null
/// </exception>
/// <exception cref="ArgumentException">
/// thrown when <paramref name="netStream"/> is not connected
/// </exception>
protected IOHandler(
EncryptDecrypt encryptdecrypt,
NetworkStream netStream)
: this()
{
if (null == encryptdecrypt)
throw
new ArgumentNullException("encryptdecrypt");
if (null == netStream)
throw
new ArgumentNullException("netStream");
if (false == netStream.CanRead ||
false == netStream.CanWrite)
throw
new ArgumentException(
"should be open and connected to PhotoShop",
"netStream");
this._encryptDecrypt = encryptdecrypt;
this._netStream = netStream;
queueCheckNotification();
}
/// <summary>
/// generate encrypted byte array from current object's fields's values.
/// </summary>
/// <param name="encryptor">used for enscryption</param>
/// <returns>
/// encrypted byte array representation of current object
/// </returns>
public byte[] GetEncryptedBuffer(
EncryptDecrypt encryptor)
{
return encryptor.Encrypt(GetPlainBuffer());
}
/// <summary>
/// create new <see cref="IOHandler"/> object from given parameters.
/// </summary>
/// <param name="password">password used with encrypt/decrypt</param>
/// <param name="hostName">communication target</param>
/// <param name="writer">
/// as run logger,
/// Actually,
/// <seealso cref="TextWriter.WriteLine(string)"/> is the only function used.
/// </param>
/// <param name="localPort">
/// local host port, when establishing communication socket
/// </param>
/// <returns>
/// newly created <see cref="IOHandler"/> object
/// </returns>
/// <exception cref="ArgumentNullException">
/// thrown when <paramref name="password"/> is null or empty
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// thrown when password argument contains characters
/// except ascii visible characters ([\x20-\x7E])
/// </exception>
/// <exception cref="ArgumentNullException">
/// thrown when <paramref name="hostName"/> is null or empty
/// </exception>
public static IOHandler CreateNew(
string password,
string hostName,
TextWriter writer = null,
int localPort = Constants.LOCAL_PORT_DEFAULT)
{
if (string.IsNullOrEmpty(password))
throw
new ArgumentNullException("password");
if (false == password.IsPhotoShopPBKDF2AcceptableString())
throw
new ArgumentOutOfRangeException(
"password",
"password should be composed of " +
"ascii visible characters ([\x20-\x7E]).");
if (string.IsNullOrEmpty(hostName))
throw
new ArgumentNullException("hostName");
var encryptDecrypt = new EncryptDecrypt(password);
var tcpclient =
new TcpClient(
new IPEndPoint(
IPAddress.Parse("0.0.0.0"),
localPort));
tcpclient.Connect(hostName, PhotoShopConstants.COMMUNICATION_PORT);
var netStream = tcpclient.GetStream();
return
new IOHandler(encryptDecrypt, netStream)
{
AsRunLogger = writer
};
}
/// <summary>
/// create new <see cref="DataBlock"/> from given encrypted byte array
/// </summary>
/// <param name="decryptor">
/// used for descryption of given encrypted byte array</param>
/// <param name="encryptedBytes">
/// encrypted byte array to decrypt</param>
/// <returns>
/// new <see cref="DataBlock"/> from given encrypted byte array
/// </returns>
/// <exception cref="ArgumentNullException">
/// thrown when given "decryptor" parameter is null
/// </exception>
/// <exception cref="ArgumentNullException">
/// thrown when given "encryptedBytes" parameter is null
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// thrown when given "encryptedBytes" parameter is shorter than
/// <seealso cref="PhotoShopConstants.PROTOCOL_LENGTH"/>
/// </exception>
public static DataBlock CreateNonErrorDataBlock(
EncryptDecrypt decryptor,
byte[] encryptedBytes)
{
// check for required conditions
if (null == decryptor)
throw new ArgumentNullException("decryptor");
if (null == encryptedBytes)
throw new ArgumentNullException("encryptedBytes");
if (encryptedBytes.Length < PhotoShopConstants.PROTOCOL_LENGTH)
throw new ArgumentOutOfRangeException("encryptedBytes");
using (var msStream = new MemoryStream(decryptor.Decrypt(encryptedBytes)))
{
var result = new DataBlock();
using (var brReader = new BinaryReader(msStream))
{
// protocol version, transaction id, content type are passed
// with Big-Endian byte order
// so need to convert to host byte order, ie little-endian
result.ProtocolVersion =
IPAddress.NetworkToHostOrder(
brReader.ReadInt32());
result.TransactionID =
IPAddress.NetworkToHostOrder(
brReader.ReadInt32());
var contentTypeValue =
IPAddress.NetworkToHostOrder(
brReader.ReadInt32());
switch (contentTypeValue)
{
case (int)ContentType.ERRORSTRING:
case (int)ContentType.JAVASCRIPT:
case (int)ContentType.IMAGE:
case (int)ContentType.PROFILE:
case (int)ContentType.DATA:
result.ContentType = (ContentType)contentTypeValue;
break;
default:
break;
}
var toRead =
(int)(msStream.Length - PhotoShopConstants.PROTOCOL_LENGTH);
result.Content =
(0 == toRead) ?
null :
brReader.ReadBytes(toRead);
return result;
}
}
}
