graphql-go-upload

A middleware for GraphQL in Go to support file uploads with a custom Upload scalar type

Installation

go get github.com/jrkt/graphql-go-upload

Usage

This middleware is designed to work with any GraphQL implementation. Simply wrap your current GraphQL handler with the upload handler and you are good to go!

Example implementation for graph-gophers

Server

package main

import (
	"context"
	"fmt"
	"log"
	"net/http"

	"github.com/gorilla/mux"
	"github.com/graph-gophers/graphql-go"
	"github.com/graph-gophers/graphql-go/relay"
	upload "github.com/jrkt/graphql-go-upload"
)

const schemaString = `
schema {
	query: Query
	mutation: Mutation
}

scalar Upload

type Query {}
type Mutation {
	uploadFiles(files: [Upload!]!): Boolean!
}`

type rootResolver struct{}

func (r *rootResolver) UploadFiles(ctx context.Context, args struct{ Files []upload.Upload }) (bool, error) {
	// handle files
	return true, nil
}

func main() {

	// parse schema
	schema := graphql.MustParseSchema(schemaString, &rootResolver{})

	// initialize http.Handler for /query entry point
	handler := &relay.Handler{Schema: schema}

	// create router
	router := mux.NewRouter()
	router.Handle("/query", upload.Handler(handler))

	fmt.Println("serving http on :8000")
	err := http.ListenAndServe(":8000", router)
	if err != nil {
		log.Fatalln(err)
	}
}

Client

This works out of the box with the File type on the front-end.

const onChange = (e) => {
    // upload e.target.files
}

<input type='file' onChange={onChange} />