/// <summary>
/// Encrypt an image message and send it to the given recipient.
/// </summary>
/// <param name="threemaId">threemaId target Threema ID</param>
/// <param name="imageFilePath">path to read image data from</param>
/// <returns>generated message ID</returns>
public string SendImageMessage(string threemaId, string imageFilePath)
{
//fetch public key
byte[] publicKey = this.apiConnector.LookupKey(threemaId);
if (publicKey == null)
{
throw new InvalidKeyException("invalid threema id");
}
//check capability of a key
CapabilityResult capabilityResult = this.apiConnector.LookupKeyCapability(threemaId);
if (capabilityResult == null || !capabilityResult.CanImage)
{
throw new NotAllowedException();
}
byte[] fileData = File.ReadAllBytes(imageFilePath);
if (fileData == null)
{
throw new IOException("invalid file");
}
//encrypt the image
EncryptResult encryptResult = CryptTool.Encrypt(fileData, this.privateKey, publicKey);
//upload the image
UploadResult uploadResult = apiConnector.UploadFile(encryptResult);
if (!uploadResult.IsSuccess)
{
throw new IOException("could not upload file (upload response " + uploadResult.ResponseCode + ")");
}
//send it
EncryptResult imageMessage = CryptTool.EncryptImageMessage(encryptResult, uploadResult, this.privateKey, publicKey);
return(apiConnector.SendE2EMessage(
threemaId,
imageMessage.Nonce,
imageMessage.Result));
}