/// <summary>
/// Creates a data element by reading the first multipart element or body of the request.
/// </summary>
private async Task <(Stream, DataElement)> ReadRequestAndCreateDataElementAsync(HttpRequest request, string elementType, List <Guid> refs, Instance instance)
{
DateTime creationTime = DateTime.UtcNow;
Stream theStream;
string contentType;
string contentFileName = null;
long fileSize = 0;
if (MultipartRequestHelper.IsMultipartContentType(request.ContentType))
{
// Only read the first section of the mulitpart message.
MediaTypeHeaderValue mediaType = MediaTypeHeaderValue.Parse(request.ContentType);
string boundary = MultipartRequestHelper.GetBoundary(mediaType, _defaultFormOptions.MultipartBoundaryLengthLimit);
MultipartReader reader = new MultipartReader(boundary, request.Body);
MultipartSection section = await reader.ReadNextSectionAsync();
theStream = section.Body;
contentType = section.ContentType;
bool hasContentDisposition = ContentDispositionHeaderValue.TryParse(section.ContentDisposition, out ContentDispositionHeaderValue contentDisposition);
if (hasContentDisposition)
{
contentFileName = contentDisposition.FileName.ToString();
fileSize = contentDisposition.Size ?? 0;
}
}
else
{
theStream = request.Body;
if (request.Headers.TryGetValue("Content-Disposition", out StringValues headerValues))
{
string contentDisposition = headerValues.ToString();
List <string> contentDispositionValues = contentDisposition.Split(';').ToList();
string fileNameValue = contentDispositionValues.FirstOrDefault(x =>
x.Contains("filename", StringComparison.CurrentCultureIgnoreCase));
if (!string.IsNullOrEmpty(fileNameValue))
{
string[] valueParts = fileNameValue.Split('=');
if (valueParts.Length == 2)
{
contentFileName = valueParts[1];
}
}
}
contentType = request.ContentType;
}
DataElement newData = DataElementHelper.CreateDataElement(elementType, refs, instance, creationTime,
contentType, contentFileName, fileSize, null);
return(theStream, newData);
}
/// <summary>
/// Creates a data element by reading the first multipart element or body of the request.
/// </summary>
private async Task <(Stream Stream, DataElement DataElement)> ReadRequestAndCreateDataElementAsync(HttpRequest request, string elementType, List <Guid> refs, Instance instance)
{
DateTime creationTime = DateTime.UtcNow;
Stream theStream;
string contentType;
string contentFileName = null;
long fileSize = 0;
if (MultipartRequestHelper.IsMultipartContentType(request.ContentType))
{
// Only read the first section of the Multipart message.
MediaTypeHeaderValue mediaType = MediaTypeHeaderValue.Parse(request.ContentType);
string boundary = MultipartRequestHelper.GetBoundary(mediaType, _defaultFormOptions.MultipartBoundaryLengthLimit);
MultipartReader reader = new MultipartReader(boundary, request.Body);
MultipartSection section = await reader.ReadNextSectionAsync();
theStream = section.Body;
contentType = section.ContentType;
bool hasContentDisposition = ContentDispositionHeaderValue.TryParse(section.ContentDisposition, out ContentDispositionHeaderValue contentDisposition);
if (hasContentDisposition)
{
contentFileName = HttpUtility.UrlDecode(contentDisposition.GetFilename());
fileSize = contentDisposition.Size ?? 0;
}
}
else
{
theStream = request.Body;
if (request.Headers.TryGetValue("Content-Disposition", out StringValues headerValues))
{
bool hasContentDisposition = ContentDispositionHeaderValue.TryParse(headerValues.ToString(), out ContentDispositionHeaderValue contentDisposition);
if (hasContentDisposition)
{
contentFileName = HttpUtility.UrlDecode(contentDisposition.GetFilename());
fileSize = contentDisposition.Size ?? 0;
}
}
contentType = request.ContentType;
}
string user = User.GetUserOrOrgId();
DataElement newData = DataElementHelper.CreateDataElement(elementType, refs, instance, creationTime, contentType, contentFileName, fileSize, user);
return(theStream, newData);
}
/// <summary>
/// Creates a data element by reading the first multipart element or body of the request.
/// </summary>
private DataElement GetDataElementFromRequest(HttpRequest request, string elementType, Instance instance, out Stream theStream)
{
DateTime creationTime = DateTime.UtcNow;
theStream = null;
string contentType = null;
string contentFileName = null;
long fileSize = 0;
if (MultipartRequestHelper.IsMultipartContentType(request.ContentType))
{
// Only read the first section of the mulitpart message.
MediaTypeHeaderValue mediaType = MediaTypeHeaderValue.Parse(request.ContentType);
string boundary = MultipartRequestHelper.GetBoundary(mediaType, _defaultFormOptions.MultipartBoundaryLengthLimit);
MultipartReader reader = new MultipartReader(boundary, request.Body);
MultipartSection section = reader.ReadNextSectionAsync().Result;
theStream = section.Body;
contentType = section.ContentType;
bool hasContentDisposition = ContentDispositionHeaderValue.TryParse(section.ContentDisposition, out ContentDispositionHeaderValue contentDisposition);
if (hasContentDisposition)
{
contentFileName = contentDisposition.FileName.ToString();
fileSize = contentDisposition.Size ?? 0;
}
}
else
{
theStream = request.Body;
contentType = request.ContentType;
}
string user = null;
DataElement newData = DataElementHelper.CreateDataElement(elementType, instance, creationTime, contentType, contentFileName, fileSize, user);
return(newData);
}
private async Task <Instance> SaveDataElementsAndUpdateInstance(List <Part> parts, Instance storedInstance, DateTime creationTime, string userId)
{
try
{
foreach (Part part in parts)
{
// Create a new DataElement to be stored in blob and added in the Data List of the Instance object.
DataElement newDataElement = DataElementHelper.CreateDataElement(part.Name, storedInstance, creationTime, part.ContentType, part.FileName, part.Stream.Length, userId);
// Store file as blob.
newDataElement.FileSize = _dataRepository.WriteDataToStorage(part.Stream, newDataElement.StorageUrl).Result;
if (newDataElement.FileSize > 0)
{
storedInstance.Data.Add(newDataElement);
logger.LogInformation($"Data element '{newDataElement.ElementType} - {newDataElement.Id}' is stored at {newDataElement.StorageUrl}, file size {newDataElement.FileSize / 1024}KB");
}
}
// Update instance with the data element.
storedInstance = _instanceRepository.Update(storedInstance).Result;
}
catch (Exception dataElementException)
{
// compensating action - delete blobs
logger.LogError($"Creation of data elements failed. {dataElementException}");
foreach (DataElement dataElement in storedInstance.Data)
{
await _dataRepository.DeleteDataInStorage(dataElement.StorageUrl);
logger.LogError($"Deleted data element '{dataElement.ElementType} - {dataElement.Id}' stored at {dataElement.StorageUrl}");
}
throw;
}
return(storedInstance);
}
