How to redirect after login successful ?

[gampangdibaca]

My program is already working, but i want to redirect the page to home after scanning qr and login process is finished.

Here is part of my code :

func loginWhatsapp(w http.ResponseWriter, req *http.Request){
    session, err := whatsappWeb.ReadSession()
    if err == nil {
        err := tpl.ExecuteTemplate(w, "whatsapp-login.gohtml", "")
        if err != nil {
            log.Fatalln(err)
        }
        return
    } else {
        channel := make(chan string)
        go func() {
            conn, err := whatsapp.NewConn(15 * time.Second)
            session, err = conn.Login(channel)
            if err != nil {
                log.Print("Error during restoreSession ", err)
                return
            }
            log.Print("Session", session)
            //save session
            err = whatsappWeb.WriteSession(session)
            if err != nil {
                fmt.Errorf("error saving session: %v\n", err)
            }
            conn.GetConnected()
            log.Println("login finish")
        }()
        log.Print("Waiting for QR Generation")
        qrData := <-channel
        image, _ := qrcode.Encode(qrData, qrcode.Medium, 256)
        log.Print("QR Generated")
        w.Header().Set("Content-Type", "image/png")
        w.Header().Set("Content-Length", strconv.Itoa(len(image)))
        if _, err := w.Write(image); err != nil {
            log.Println("unable to write image.")
        }
        log.Println("login finished")
        http.Redirect(w, req, "/", http.StatusSeeOther)
    }

}

i have already tried using channel and waitgroup. but it is blocking the qr from getting shown on the screen. If anyone can help, that would be so much appreciated.

[danielspk]

Hi @gampangdibaca.

You must return the QR image using an http response. When the image is correctly scanned you must notify the client of this operation, you can do it through a websocket or SSE (see the Mercure Hub project).

I don't see an easy way to solve it.

[akbarfa49]

@gampangdibaca i think u should add wg.wait or channel before http.redirect.

wa connect -> login finish -> signaling the wg.wait or channel -> continue http redirect.