public async Task <bool> VerifyUploadedFile(Guid guid)
{
var file = await _filesRepository.GetFileAsync(guid);
if (file == null)
{
return(false);
}
var stream = await _blobStorage.DownloadFile(file.Name);
if (stream == null)
{
return(false);
}
var md5 = MD5.Create();
var blobHashValue = Convert.ToBase64String(md5.ComputeHash(stream));
var blockchainFileHashValue = await _ethereumStorage.GetDocumentHashFromChain(file.Guid.ToString());
var isValid = blobHashValue == blockchainFileHashValue;
var entry = new BlockchainHistory
{
FileGuid = file.Guid,
Timestamp = DateTime.Now,
Status = isValid ? BlockchainStatuses.Verified : BlockchainStatuses.Corrupted
};
await _filesRepository.SaveAsync(entry);
return(true);
}
public async Task SaveAsync(BlockchainHistory history)
{
await _context.AddAsync(history);
await SaveChangesAsync();
}