/// <summary>
/// Accepts a DownloadHeader or DownloadFile request with custom metadata.
/// </summary>
/// <param name="e">The related request with many important information.</param>
/// <param name="path">Local path where the file currently exists or will be stored.</param>
/// <param name="meta">Only for file sending! The metadata to send especially for E2E server applications.</param>
public async Task <bool> AcceptAsync(FTEventArgs e, string path, FileMeta meta)
{
e.Path = path;
e.Assign(parent, this);
e.FileMeta = meta;
currentItem = e;
if (!await parent.Manager.SendPacketAsync(new P06Accepted(true, 7, ProblemCategory.None))) // accept the transfer
{
return(false);
}
if (currentItem.Mode == StreamMode.PushHeader || currentItem.Mode == StreamMode.PushFile) // start by sending the FileMeta
{
if (currentItem.FileMeta == null)
{
currentItem.FileMeta = await FileMeta.FromFileAsync(path, ContentAlgorithm.None);
}
if (!await parent.Manager.SendPacketAsync(new P08FileHeader(currentItem.FileMeta.GetBinaryData(parent.ConnectionVersion.Value))))
{
return(false);
}
}
else if (meta != null)
{
throw new ArgumentException("You must not supply a FileMeta for a receive operation.", nameof(meta));
}
return(true);
}
/// <summary>
/// Initalizes a new instance of the <see cref="FTEventArgs"/> that can be used to send the associated file.
/// </summary>
/// <param name="identifier">A universal identifier to specify the file to process.</param>
/// <param name="meta">Meta data of the file and required cryptographic keys.</param>
/// <param name="path">The path where file currently exists or will be stored.</param>
public FTEventArgs(Identifier identifier, FileMeta meta, string path)
: this()
{
Identifier = identifier;
FileMeta = meta;
Path = path;
}
/// <summary>
/// Initializes a new instance of the <see cref="FileMeta"/> class and generates missing keys.
/// </summary>
/// <param name="path">The local file path to load the meta data from.</param>
/// <param name="algorithm">The cryptographic algorith to encrypt this <see cref="FileMeta"/>.</param>
/// <param name="hmacKey">256 bit HMAC key to verify integrity of this <see cref="FileMeta"/>.</param>
/// <param name="aesKey">256 bit AES key to encrypt this <see cref="FileMeta"/>.</param>
/// <param name="fileKey">256 bit AES key to encrypt the associated file.</param>
/// <exception cref="ArgumentException"/>
/// <exception cref="ArgumentNullException"/>
/// <exception cref="ArgumentOutOfRangeException"/>
/// <exception cref="FileNotFoundException"/>
public static async Task <FileMeta> FromFileAsync(string path, ContentAlgorithm algorithm, byte[] hmacKey, byte[] aesKey, byte[] fileKey)
{
if (string.IsNullOrWhiteSpace(path))
{
throw new ArgumentNullException(nameof(path));
}
if (algorithm != ContentAlgorithm.None && algorithm != ContentAlgorithm.Aes256CbcHmacSha256)
{
throw new ArgumentException("This content algorithm is not supported.", nameof(algorithm));
}
FileMeta instance = new FileMeta(algorithm, hmacKey, aesKey, fileKey);
await instance.LoadFromFileAsync(path);
instance.Available = true;
return(instance);
}
