Golang golang-upload (snippet)

Go programming example 'golang-upload'

golang-upload

Golang beginners example: golang-upload

package main

import (
    "fmt"
    "html/template"
    "io/ioutil"
    "net/http"
    "os"
)

var size int64 = 5 * 1024 * 1024
var html = template.Must(template.New("html").Parse(`
<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8"/>
        <title>Golang File Upload</title>
    </head>
    <body>
        <form action="/upload" method="POST" enctype="multipart/form-data">
            <label for="file">File: </label>
            <input name="file" type="file"></input>
            <button type="submit">upload</button>
        </form>
    </body>
</html>
`))

func root(w http.ResponseWriter, r *http.Request) {
    err := html.Execute(w, nil)
    if err != nil {
        fmt.Print(err)
    }
}

func upload(w http.ResponseWriter, r *http.Request) {
    var path string
    if err := r.ParseMultipartForm(size); err != nil {
        fmt.Println(err)
        http.Error(w, err.Error(), http.StatusForbidden)
    }

    for _, fileHeaders := range r.MultipartForm.File {
        for _, fileHeader := range fileHeaders {
            file, _ := fileHeader.Open()
            path = fmt.Sprintf("%s", fileHeader.Filename)
            buf, _ := ioutil.ReadAll(file)
            ioutil.WriteFile(path, buf, os.ModePerm)
        }
    }
    fmt.Printf("File \"%v\" uploaded\n", path)
}

func main() {
    http.HandleFunc("/upload", upload)
    http.HandleFunc("/", root)
    fmt.Print(http.ListenAndServe(":8080", nil))
}

Useful links

Learn Go: https://golangr.com
Download Go: https://golang.org