- Membuat akun google cloud di https://console.developers.google.com.
- Pilih menu APIs & Services.
- Buat dulu projectnya.
- Buat juga OAuth consent screen.
- Lalu pergi ke menu credentials -> Create Credentials -> OAtuh Client ID -> pilih jenis aplikasi yang akan digunakan.
- Bagian Authorized redirect URLs isikan http//localhost:8080/callback untuk test.
- Lalu Create.
- Lalu buat folder project:
- mkdir 2_google-oauth2
- git init
- go mod init 2_google-oauth2
- go get golang.org/x/oauth2
- go get golang.org/x/oatuh2/google
- Buat file main.go dengan isi seperti ini:
package main
import (
"fmt"
"io/ioutil"
"net/http"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
)
var (
googleOAuthConfig = &oauth2.Config{
RedirectURL: "http://localhost:8080/callback", //URL ini harus sama dengan redirect_uri pada google developer console
ClientID: "SISIPKAN CLIENT ID DISINI",
ClientSecret: "SISIPKAN CLIENT SECRET DISINI",
// scopes API URL bisa didapatkan di https://developers.google.com/identity/protocols/oauth2/scopes
Scopes: []string{"https://www.googleapis.com/auth/userinfo.profile"},
Endpoint: google.Endpoint,
}
randomState = "random"
)
func main() {
http.HandleFunc("/", handleHome)
http.HandleFunc("/login", handleLogin)
http.HandleFunc("/callback", handleCallback)
http.ListenAndServe(":8080", nil)
}
func handleHome(w http.ResponseWriter, r *http.Request) {
halaman := "/login"
html := "<html><body><a href=" + halaman + ">Login using google</a></body></html>"
fmt.Fprint(w, html)
}
func handleLogin(w http.ResponseWriter, r *http.Request) {
url := googleOAuthConfig.AuthCodeURL(randomState)
http.Redirect(w, r, url, http.StatusTemporaryRedirect)
}
func handleCallback(w http.ResponseWriter, r *http.Request) {
if r.FormValue("state") != randomState {
fmt.Println("State is not valid")
http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
return
}
token, err := googleOAuthConfig.Exchange(oauth2.NoContext, r.FormValue("code"))
if err != nil {
fmt.Println("could not get token \n", err.Error())
http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
return
}
// fmt.Println(token.AccessToken)
resp, err := http.Get("https://www.googleapis.com/oauth2/v2/userinfo?access_token=" + token.AccessToken)
if err != nil {
fmt.Println("could not create request \n", err.Error())
http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
return
}
defer resp.Body.Close()
content, err := ioutil.ReadAll(resp.Body)
if err != nil {
fmt.Printf("could not read response body \n", err.Error())
http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
return
}
fmt.Fprintf(w, "Content: %s", content) //Menampilkan data yang didapat
}
- Test dengan cara
go run main.go