private static void EnsureArgumentsAreValid(Stream stream, FileInfo fileInfo)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
if (fileInfo == null)
{
throw new ArgumentNullException(nameof(fileInfo));
}
if (!fileInfo.MimeType.IsNullOrWhiteSpace())
{
return;
}
if (fileInfo.Filename.IsNullOrWhiteSpace() && fileInfo.Extension.IsNullOrWhiteSpace())
{
throw new ArgumentException("Filename and extension are null.");
}
if (!fileInfo.Extension.IsNullOrWhiteSpace())
{
return;
}
fileInfo.Extension = Path.GetExtension(fileInfo.Filename);
if (fileInfo.Extension.IsNullOrWhiteSpace())
{
throw new ArgumentException("After parsing from filename extension is still empty.");
}
}
public async Task <File> UploadFileAsync(string base64String, FileInfo fileInfo, bool needToSaveChanges = true)
{
var stream = GetStreamFromBase64File(base64String);
var mimeType = GetMimeTypeFromBase64File(base64String);
fileInfo ??= new FileInfo();
fileInfo.MimeType = mimeType;
return(await UploadFileAsync(stream, fileInfo, needToSaveChanges));
}
public async Task <File> UploadFileAsync(IFormFile file, bool needToSaveChanges = true)
{
var stream = file.OpenReadStream();
var fileInfo = new FileInfo
{
Filename = file.FileName,
MimeType = file.ContentType
};
return(await UploadFileAsync(stream, fileInfo, needToSaveChanges));
}
public async Task <File> UploadFileAsync(Stream stream, FileInfo fileInfo, bool needToSaveChanges = true)
{
EnsureArgumentsAreValid(stream, fileInfo);
await using var mnpContext = _contextFactory.Create();
var fileHash = fileInfo.Hash;
if (fileHash.IsNullOrWhiteSpace())
{
fileHash = ComputeMd5Hash(stream);
}
var fileInDb = await mnpContext.Files.AsNoTracking().SingleOrDefaultAsync(f => f.Hash == fileHash);
if (fileInDb != null)
{
_logger.LogInformation($"File with hash {fileHash} already uploaded.");
return(fileInDb);
}
var mimeType = fileInfo.MimeType ?? MimeTypes.GetMimeType(fileInfo.Extension);
var filePath = BuildFilePath(fileHash);
var fileStream = new FileStream(filePath, FileMode.Create, FileAccess.Write);
await stream.CopyToAsync(fileStream);
await fileStream.DisposeAsync();
var file = new File
{
CreationDate = DateTime.Now,
FileLink = "/Files/" + fileHash,
Filename = fileInfo.Filename ?? fileHash,
Hash = fileHash,
MimeType = mimeType
};
if (needToSaveChanges)
{
await mnpContext.AddAsync(file);
await mnpContext.SaveChangesAsync();
}
return(file);
}