Upload a file to IronWorker from Go

upload.go

package main

import (
        "fmt"
        "net/http"
        "mime/multipart"
        "bytes"
        "os"
        "io"
        "io/ioutil"
        "encoding/json"
)

type ReqData struct {
        Name string `json:"name"`
        FileName string `json:"file_name"`
        Runtime string `json:"runtime"`
}

func main() {
        project := "4f8e3....."
        token := "AhEg....."
        target := fmt.Sprintf("http://worker-aws-us-east-1.iron.io/2/projects/%s/codes?oauth=%s", project, token)
        json_data := &ReqData {
                Name: "GoWorker",
                FileName: "__runner__.sh",
                Runtime: "sh",
        }
        json_bytes, err := json.Marshal(json_data)
        if err != nil {
                panic(err.Error())
        }
        json_str := string(json_bytes)
        body_buf := bytes.NewBufferString("")
        body_writer := multipart.NewWriter(body_buf)
        filename := "worker.zip"
        file_writer, err := body_writer.CreateFormFile("file", filename)
        if err != nil {
                panic(err.Error())
        }
        fh, err := os.Open(filename)
        if err != nil {
                panic(err.Error())
        }
        io.Copy(file_writer, fh)
        body_writer.WriteField("data", json_str)
        content_type := body_writer.FormDataContentType()
        body_writer.Close()
        resp, err := http.Post(target, content_type, body_buf)
        if err != nil {
                panic(err.Error())
        }
        defer resp.Body.Close()
        resp_body, err := ioutil.ReadAll(resp.Body)
        if err != nil {
                panic(err.Error())
        }
        fmt.Println(resp.Status)
        fmt.Println(string(resp_body))
}