Comments (4)
Hi,
I spent some time looking into this and I created an example in the SampleApp
. I have added two new HTTP POST endpoints, one for small file uploads and another for large file uploads:
POST >=>
choose [
route "/small-upload" >=> smallFileUploadHandler
route "/large-upload" >=> largeFileUploadHandler ]
Then I implemented two handlers to deal with small and large file uploads:
open System.Threading
open Microsoft.AspNetCore.Http.Features
let smallFileUploadHandler =
fun (ctx : HttpContext) ->
async {
return!
(match ctx.Request.HasFormContentType with
| false -> setStatusCode 400 >=> text "Bad request"
| true ->
ctx.Request.Form.Files
|> Seq.fold (fun acc file -> sprintf "%s\n%s" acc file.FileName) ""
|> text) ctx
}
let largeFileUploadHandler =
fun (ctx : HttpContext) ->
async {
let formFeature = ctx.Features.Get<IFormFeature>()
let! form = formFeature.ReadFormAsync CancellationToken.None |> Async.AwaitTask
return!
(form.Files
|> Seq.fold (fun acc file -> sprintf "%s\n%s" acc file.FileName) ""
|> text) ctx
}
I used the built in features form ASP.NET Core. For small file uploads you can directly access the files by calling ctx.Request.Form.Files
, which returns an IFormCollection
where each item is of type IFormFile
. This matches exactly what you would get by injecting an IFormFile
object into an MVC action as shown in the documented example for small file uploads.
For large file uploads there is an existing IFormFeature
inside the Microsoft.AspNetCore.Http.Features
namespace that you can use to stream large files. The original implementation can be found here and as you can see, it does exactly what has been described in the documentation for large file uploads.
It uses the MultipartReader
to read each section and a KeyValueAccumulator
to store the streamed data.
What do you think of my two examples? Is there something you would like to add or extend from a Giraffe point of view?
from giraffe.
Hi, just to let you know I will look at your example later this evening and pick this one up next!
from giraffe.
Thanks!
from giraffe.
Hi, thanks for these examples. They are great! I had no idea that it could be this easy to process files.
I was able to reduce my own code from 90 lines to 15.
I don't think Giraffe itself needs any extension to work with files.
from giraffe.
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