Add support to file upload

[Jonatthu]

Is this library helping out how to upload a file on a mutation?

If not how can be performed without any extra dependencies?

Or if we need dependencies...

How graphql-dotnet-server can be integrated with https://github.com/SimonCropp/GraphQL.Attachments?

[Jonatthu]

I found the next snippet

            Field<StringGraphType>(
                "uploadFile",
                arguments: new QueryArguments(
                    new QueryArgument<StringGraphType> { Name = "args" },
                    new QueryArgument<FileGraphTpe> { Name = "file" }
                ),
                resolve: context => {
                    var files = context.UserContext.As<IFormFileCollection>();

                    SaveFIles(files);

                    return "Success";
                }
            );

But not sure if this is an official way to do it or graphql-dotnet-server can make it better or in a different way.

Reference:
graphql-dotnet/graphql-dotnet#419

[sungam3r]

Relates to graphql-dotnet/graphql-dotnet#511

[Jonatthu]

@sungam3r Just found this https://github.com/JannikLassahn/graphql-dotnet-upload
Maybe can be integrated as part of this project

[Shane32]

The tests for GraphQL.NET Server v7 now includes a file-upload sample implementation along the lines written above, where it takes files passed via multipart/form-data and injects them as variables to the execution engine as a custom scalar graph type.

See: https://github.com/graphql-dotnet/server/blob/develop/tests/Transports.AspNetCore.Tests/Middleware/FileUploadTests.cs

This could of course be extended to support base64 string encoding as an alternative to multipart/form-data encoding, etc.

Please re-open if there are additional questions along these lines.

[ng-druid]

I found this thread digging for info on how to read the file upload. We have successfully been able to upload a file using graph QL. Now just need to figure out how to download it using the same api. The Text property is always empty when querying. Anyway… here is how to upload with go.

(origionally built for s3)

func UploadMediaFile(req *events.APIGatewayProxyRequest, ac *ActionContext) (events.APIGatewayProxyResponse, error) {

	res := events.APIGatewayProxyResponse{StatusCode: 403}

	body, err := base64.StdEncoding.DecodeString(req.Body)
	if err != nil {
		return res, err
	}

	r := http.Request{
		Method: req.HTTPMethod,
		Header: map[string][]string{
			"Content-Type": {req.Headers["Content-Type"]},
		},
		Body: ioutil.NopCloser(bytes.NewBuffer(body)),
	}

	file, header, err := r.FormFile("File")
	defer file.Close()
	if err != nil {
		return res, err
	}

	contentType := header.Header.Get("Content-Type")
	ext, _ := mime.ExtensionsByType(contentType)
	id := header.Filename
	if pos := strings.LastIndexByte(header.Filename, '.'); pos != -1 {
		id = header.Filename[:pos]
	}

	if contentType == "text/markdown" {
		ext = []string{".md"}
	}

	// Necessary to commit to github but not for s3
	dataBuffer := bytes.NewBuffer(nil)
	if _, err := io.Copy(dataBuffer, file); err != nil {
		return res, err
	}

	d := []byte(dataBuffer.String())
	suffix := ""
	if os.Getenv("GITHUB_BRANCH") == "master" {
		suffix = "-prod"
	}
	params := repo.CommitParams{
		Repo:   "rollthecloudinc/" + req.PathParameters["site"] + "-objects" + suffix,
		Branch: os.Getenv("GITHUB_BRANCH"),
		Path:   "media/" + id + ext[0],
		Data:   &d,
	}

	repo.Commit(
		ac.GithubV4Client,
		&params,
	)

	/*userId := GetUserId(req)
	uploader := s3manager.NewUploader(ac.Session)
	_, err = uploader.Upload(&s3manager.UploadInput{
		Bucket:      aws.String(ac.BucketName),
		Key:         aws.String(data["path"]),
		Body:        file,
		ContentType: aws.String(data["contentType"]),
		Metadata:    map[string]*string{"userId": &userId},
	})
	if err != nil {
		return res, err
	}*/

	data := map[string]string{
		"id":                 id,
		"path":               "media/" + id + ext[0],
		"contentType":        contentType,
		"contentDisposition": header.Header.Get("Content-Disposition"),
		"length":             fmt.Sprint(header.Size),
	}

	res.StatusCode = 200
	res.Headers = map[string]string{
		"Content-Type": "application/json",
	}

	body, err = json.Marshal(data)
	res.Body = string(body)

	return res, nil
}

Full code: https://github.com/rollthecloudinc/verti-go/blob/master/api/media/main.go

[Shane32]

@ng-druid Thanks! I’ve added a link to this thread in the readme.