public async Task <IActionResult> RemoteDownloadItem([FromBody] RemoteDownloadRequest model)
{
HttpClient client = new();
client.DefaultRequestHeaders.UserAgent.Clear();
client.DefaultRequestHeaders.UserAgent.ParseAdd("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36");
using var resp = await client.GetAsync(model.Url);
if (!resp.IsSuccessStatusCode)
{
throw new MemzException(MemzErrorCode.DownloadFailed, $"Cannot download image [{resp.StatusCode}] {model.Url}");
}
var mime = resp.Content.Headers.ContentType.MediaType ?? string.Empty;
if (!MimeMappings.IsSupportedMime(mime))
{
throw new MemzException(MemzErrorCode.InvalidFileType, $"Invalid file type {mime}");
}
var stream = await resp.Content.ReadAsStreamAsync();
var id = Guid.NewGuid().ToString();
var name = Path.ChangeExtension(id, MimeMappings.MimeToFileExtension(mime));
var meta = new StoredItemMetadata(0x01, name, mime, name, Array.Empty <string>(), null);
await repo.StoreItem(GetRepository(), GetPassphrase(), id, meta, stream);
var(info, _) = (await repo.ListRepositoryAsync(GetRepository(), GetPassphrase(), 0, 1, null, inf => inf.ItemId == id));
return(Ok(ApiResponse.FromData(info.FirstOrDefault())));
}
public async Task StoreItem(string repo, string passphrase, string itemId, StoredItemMetadata meta, Stream dataStream)
{
var masterKey = await GetRepositoryMasterKey(repo, passphrase);
var iv = crypto.GenerateRandomIV();
meta = meta with {
Base64IV = Convert.ToBase64String(iv)
};
var encryptedStream = crypto.CreateEncryptionStream(dataStream, masterKey, iv);
await SetItemMetadata(repo, passphrase, itemId, meta);
await driver.WriteItem(repo, itemId, encryptedStream);
}
public async Task SetItemMetadata(string repo, string passphrase, string itemId, StoredItemMetadata meta)
{
var rawJson = JsonSerializer.Serialize(meta, new() { WriteIndented = false });
var binaryJson = Encoding.UTF8.GetBytes(rawJson);
var metadataPacket = crypto.PassphraseEncrypt(Encoding.UTF8.GetBytes(passphrase), binaryJson);
var serializedPacket = metadataPacket.ToString();
var encryptedMetadata = Encoding.ASCII.GetBytes(serializedPacket);
await driver.WriteMetadata(repo, itemId, encryptedMetadata);
}
