How to perform POST using .NET Core 6 Minimal API in Azure Blob Storage - asp.net-core

Question

I am new to .NET and I have to perform this. Assuming we have the connection string and the Environment variable setup, could someone give me resources or code or guide on how to do it?
I just need to upload a pdf file in Azure Blob Storage using Minimal API

Answer 1

From the Minimal API document, we can see that the Minimal API does not support the binding the IFormFile.
No support for binding from forms. This includes binding IFormFile. We plan to add support for IFormFile in the future.
So, to upload file in the Minimal API, you can get the upload file from the HttpRequest Form. Refer to the following code:
app.MapPost("/upload", (HttpRequest request) =>
{
if (!request.Form.Files.Any())
return Results.BadRequest("At least one fie is need");
//Do something with the file
foreach(var item in request.Form.Files)
{
var file = item;
//insert the file into the Azure storage
}
return Results.Ok();
});
The screenshot as below:
Then, to upload the file to Azure Blob Storage, refer the following tutorial:
Upload images/files to blob azure, via web api ASP.NET framework Web application
Code like this:
CloudStorageAccount storageAccount;
Dictionary<string, object> dict = new Dictionary<string, object>();
string strorageconn = ConfigurationManager.AppSettings.Get("MyBlobStorageConnectionString");
if (CloudStorageAccount.TryParse(strorageconn, out storageAccount))
{
try
{
// Create the CloudBlobClient that represents the
// Blob storage endpoint for the storage account.
CloudBlobClient cloudBlobClient = storageAccount.CreateCloudBlobClient();
// Create a container called 'quickstartblobs' and
// append a GUID value to it to make the name unique.
CloudBlobContainer cloudBlobContainer = cloudBlobClient.GetContainerReference("images");
await cloudBlobContainer.CreateIfNotExistsAsync();
// Set the permissions so the blobs are public.
BlobContainerPermissions permissions = new BlobContainerPermissions
{
PublicAccess = BlobContainerPublicAccessType.Blob
};
await cloudBlobContainer.SetPermissionsAsync(permissions);
var httpRequest = HttpContext.Current.Request;
foreach (string file in httpRequest.Files)
{
HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.Created);
var postedFile = httpRequest.Files[file];
string imageName = ("images" + serverTime.Year.ToString() + serverTime.Month.ToString() + serverTime.Day.ToString() +
serverTime.Hour.ToString() + serverTime.Minute.ToString() + serverTime.Second.ToString() + serverTime.Millisecond.ToString()
+ postedFile.FileName );
if (postedFile != null && postedFile.ContentLength > 0)
{
int MaxContentLength = 1024 * 1024 * 1; //Size = 1 MB
IList<string> AllowedFileExtensions = new List<string> { ".jpg", ".gif", ".png" };
var ext = postedFile.FileName.Substring(postedFile.FileName.LastIndexOf('.'));
var extension = ext.ToLower();
if (!AllowedFileExtensions.Contains(extension))
{
var message = string.Format("Please Upload image of type .jpg,.gif,.png.");
dict.Add("error", message);
return Request.CreateResponse(HttpStatusCode.BadRequest, dict);
}
else if (postedFile.ContentLength > MaxContentLength)
{
var message = string.Format("Please Upload a file upto 1 mb.");
dict.Add("error", message);
return Request.CreateResponse(HttpStatusCode.BadRequest, dict);
}
else
{
CloudBlockBlob cloudBlockBlob = cloudBlobContainer.GetBlockBlobReference(imageName);
cloudBlockBlob.Properties.ContentType = postedFile.ContentType;
await cloudBlockBlob.UploadFromStreamAsync(postedFile.InputStream);
}
}
var message1 = string.Format("Image Updated Successfully.");
return Request.CreateErrorResponse(HttpStatusCode.Created, message1);
}
var res3 = string.Format("Please Upload a image.");
dict.Add("error", res3);
return Request.CreateResponse(HttpStatusCode.NotFound, dict);
}
catch (Exception ex)
{
HttpResponseMessage response2 = Request.CreateResponse(HttpStatusCode.BadRequest, ex.InnerException.ToString());
return response2;
}
}
else
{
var res = string.Format("Did not connect successfull.");
dict.Add("error", res);
return Request.CreateResponse(HttpStatusCode.NotFound, dict);
}