/// <summary>
/// Retrieve a Stream to download and decrypt the specified Uri
/// </summary>
/// <param name="uri">Uri to download</param>
/// <exception cref="NotSupportedException">Not logged in</exception>
/// <exception cref="ApiException">Mega.co.nz service reports an error</exception>
/// <exception cref="ArgumentNullException">uri is null</exception>
/// <exception cref="ArgumentException">Uri is not valid (id and key are required)</exception>
/// <exception cref="DownloadException">Checksum is invalid. Downloaded data are corrupted</exception>
public Stream Download(Uri uri, CancellationToken?cancellationToken = null)
{
if (uri == null)
{
throw new ArgumentNullException("uri");
}
EnsureLoggedIn();
string id;
byte[] iv, metaMac, key;
GetPartsFromUri(uri, out id, out iv, out metaMac, out key);
// Retrieve download URL
DownloadUrlRequestFromId downloadRequest = new DownloadUrlRequestFromId(id);
DownloadUrlResponse downloadResponse = Request <DownloadUrlResponse>(downloadRequest);
Stream dataStream = webClient.GetRequestRaw(new Uri(downloadResponse.Url));
Stream resultStream = new MegaAesCtrStreamDecrypter(dataStream, downloadResponse.Size, key, iv, metaMac);
if (cancellationToken.HasValue)
{
resultStream = new CancellableStream(resultStream, cancellationToken.Value);
}
return(resultStream);
}
internal NodeInfo(string id, DownloadUrlResponse downloadResponse, byte[] key)
{
Id = id;
Attributes = Crypto.DecryptAttributes(downloadResponse.SerializedAttributes.FromBase64(), key);
Size = downloadResponse.Size;
Type = NodeType.File;
}
/// <summary>
/// Retrieve public properties of a file from a specified Uri
/// </summary>
/// <param name="uri">Uri to retrive properties</param>
/// <exception cref="NotSupportedException">Not logged in</exception>
/// <exception cref="ApiException">Mega.co.nz service reports an error</exception>
/// <exception cref="ArgumentNullException">uri is null</exception>
/// <exception cref="ArgumentException">Uri is not valid (id and key are required)</exception>
public INodeInfo GetNodeFromLink(Uri uri)
{
if (uri == null)
{
throw new ArgumentNullException("uri");
}
EnsureLoggedIn();
string id;
byte[] iv, metaMac, key;
GetPartsFromUri(uri, out id, out iv, out metaMac, out key);
// Retrieve attributes
DownloadUrlRequestFromId downloadRequest = new DownloadUrlRequestFromId(id);
DownloadUrlResponse downloadResponse = Request <DownloadUrlResponse>(downloadRequest);
return(new NodeInfo(id, downloadResponse, key));
}
/// <summary>
/// Retrieve a Stream to download and decrypt the specified node
/// </summary>
/// <param name="node">Node to download (only <see cref="NodeType.File" /> can be downloaded)</param>
/// <exception cref="NotSupportedException">Not logged in</exception>
/// <exception cref="ApiException">Mega.co.nz service reports an error</exception>
/// <exception cref="ArgumentNullException">node or outputFile is null</exception>
/// <exception cref="ArgumentException">node is not valid (only <see cref="NodeType.File" /> can be downloaded)</exception>
/// <exception cref="DownloadException">Checksum is invalid. Downloaded data are corrupted</exception>
public Stream Download(INode node, CancellationToken?cancellationToken = null)
{
if (node == null)
{
throw new ArgumentNullException("node");
}
if (node.Type != NodeType.File)
{
throw new ArgumentException("Invalid node");
}
INodeCrypto nodeCrypto = node as INodeCrypto;
if (nodeCrypto == null)
{
throw new ArgumentException("node must implement INodeCrypto");
}
EnsureLoggedIn();
// Retrieve download URL
DownloadUrlRequest downloadRequest = new DownloadUrlRequest(node);
DownloadUrlResponse downloadResponse = Request <DownloadUrlResponse>(downloadRequest);
Stream dataStream = webClient.GetRequestRaw(new Uri(downloadResponse.Url));
Stream resultStream = new MegaAesCtrStreamDecrypter(dataStream, downloadResponse.Size, nodeCrypto.Key, nodeCrypto.Iv, nodeCrypto.MetaMac);
if (cancellationToken.HasValue)
{
resultStream = new CancellableStream(resultStream, cancellationToken.Value);
}
return(resultStream);
}
