public async Task <IActionResult> OnPostUploadMeetingMinuteAsync(CancellationToken cancellationToken, [FromForm] RequiredFileDto FileUploaded)
{
if (!ModelState.IsValid)
{
//need to manually add this due to a bug in the model binding process for .net core
//see issue here https://github.com/JeremySkinner/FluentValidation/issues/1029
ModelState.AddModelError("FileUploaded.FileToUpload",
ModelState.Keys.Where(k => k == "FileToUpload").Select(k => ModelState[k].Errors[0].ErrorMessage).First());
//set the pagemodel property to be the values submitted by the user
//not doing this will cause all model state errors to be lost
this.FileUploaded = FileUploaded;
return(Partial("_UploadMeetingMinutePartial", this));
}
var baseAPIUrl = $"api/boardmeetings/{Id}";
try
{
//call the api with a GET request
//ensure to set the httpcompletion mode to response headers read
//this allows the response to be read as soon as content starts arriving instead of having to wait
//until the entire response is read
//with this option, we can read the response content into a stream and deserialize it
var response = await(await _apiClient.WithAuthorization()).GetAsync(baseAPIUrl,
HttpCompletionOption.ResponseHeadersRead, cancellationToken);
//return the same page with an error message if the user is trying to call the API too many times
if (response.StatusCode == HttpStatusCode.TooManyRequests)
{
TempData["TooManyRequests"] = "Too many requests. Please slow down with your requests";
return(Partial("_UploadMeetingMinutePartial", this));
}
//ensure success status code else throw an exception
response.EnsureSuccessStatusCode();
//read the response content into a stream
var streamContent = await response.Content.ReadAsStreamAsync();
//deserialize the stream into an object (see StreamExtensions on how this is done)
boardMeeting = streamContent.ReadAndDeserializeFromJson <BoardMeetingViewDto>();
}
catch (HttpRequestException ex)
{
_logger.LogError($"An error occured accessing the API. Url: {HttpContext.Request.GetDisplayUrl()}" +
$" Error Message: {ex.Message}");
//either the API is not running or an error occured on the server
TempData["Error"] = "An error occured while processing your request. Please try again later.";
return(Partial("_UploadMeetingMinutePartial", this));
}
//GetFileTypeExtension returns a tuple that is deconstructed into separate variables
var(FileType, FileExtension) = _fileValidate.GetFileTypeExtension(FileUploaded.FileToUpload);
try
{
//if meeting minute id is null, it does not exist so do a post request
if (boardMeeting.MeetingMinuteId == null)
{
baseAPIUrl = $"api/boardmeetings/{Id}/meetingminutes";
//generate the file name instead of letting the user provide one
FileName = $"MeetingMinute_{DateTime.Now.ToString("MM-dd-yyyy_HH-mm-ss")}{FileExtension}";
//set the MeetingMinute filename here as otherwise it will be null
//this property is generated by the server and not provided by the user
var meetingToCreate = new MeetingMinuteInputDto {
FileName = this.FileName
};
//get the response with authorization as the API endpoint requires an authenticated user
var response = await(await _apiClient.WithAuthorization()).PostAsJsonAsync <MeetingMinuteInputDto>(baseAPIUrl,
meetingToCreate, cancellationToken);
//return the same page with an error message if the user is trying to call the API too many times
if (response.StatusCode == HttpStatusCode.TooManyRequests)
{
TempData["TooManyRequests"] = "Too many requests. Please slow down with your requests";
return(Partial("_UploadMeetingMinutePartial", this));
}
//ensure success status code else throw an exception
response.EnsureSuccessStatusCode();
}
else
{
//meeting minute already exists so just need to upload the new file
//no need to update anything as we will re-use the existing file name
FileName = boardMeeting.FileName;
}
}
catch (HttpRequestException ex)
{
_logger.LogError($"An error occured accessing the API. Url: {HttpContext.Request.GetDisplayUrl()}" +
$" Error Message: {ex.Message}");
//either the API is not running or an error occured on the server
TempData["Error"] = "An error occured while processing your request. Please try again later.";
return(Partial("_UploadMeetingMinutePartial", this));
}
//MeetingMinute was created/updated successfully so can upload file to blob storage
var blobFileToUpload = _azureBlob.GetAzureBlobFileReference(FileName, AzureBlobFolder);
//set the content type of the blob file so that downloads suggest correct file type to save as
blobFileToUpload.Properties.ContentType = FileType;
//upload the file to Azure
await _azureBlob.UploadAzureBlobFileAsync(FileUploaded.FileToUpload, blobFileToUpload);
//if successful, return the partial view which will have the IsValid value set to true by default
//this is because ajax is used to post the form rather than a submit button
return(Partial("_UploadMeetingMinutePartial", this));
}
private async Task UploadImagesAsync(string fileType)
{
//create a stream so that the image can be read to be resized
using (var memoryStream = new MemoryStream())
{
//read the file into the stream
await ImageUploaded.FileToUpload.CopyToAsync(memoryStream);
//set the position to 0 so that the file is not empty
memoryStream.Position = 0;
//create another temp stream that will be used to hold the resized image
using (var outStream = new MemoryStream())
{
//resize the image uploaded into the correct size
MagicImageProcessor.ProcessImage(memoryStream, outStream,
new ProcessImageSettings
{
Width = 400,
Height = 400,
ResizeMode = CropScaleMode.Crop,
HybridMode = HybridScaleMode.FavorSpeed
});
//set the position to 0 so that the file is not empty
outStream.Position = 0;
//get a reference to the file in Azure
var blobFileToUpload = _azureBlob.GetAzureBlobFileReference(ImageName, AzureBlobFolder);
//set the content type of the blob file so that downloads suggest correct file type to save as
blobFileToUpload.Properties.ContentType = fileType;
//upload the original resized image
await _azureBlob.UploadAzureBlobFileAsync(outStream, blobFileToUpload);
}
//create another temp stream that will be used to hold the thumbnail image
using (var outStream = new MemoryStream())
{
//set the position to 0 so that the file is not empty
memoryStream.Position = 0;
//resize the image uploaded into the correct size
MagicImageProcessor.ProcessImage(memoryStream, outStream,
new ProcessImageSettings
{
Width = 200,
Height = 200,
ResizeMode = CropScaleMode.Crop,
HybridMode = HybridScaleMode.FavorSpeed
});
//set the position to 0 so that the file is not empty
outStream.Position = 0;
//get a reference to the file in Azure
var blobFileToUpload = _azureBlob.GetAzureBlobFileReference(ThumbnailName, AzureBlobFolder);
//set the content type of the blob file so that downloads suggest correct file type to save as
blobFileToUpload.Properties.ContentType = fileType;
//upload the original resized image
await _azureBlob.UploadAzureBlobFileAsync(outStream, blobFileToUpload);
}
}
}