ezr/index.html

## index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta content="text/html;charset=utf-8" http-equiv="Content-Type">
<meta content="utf-8" http-equiv="encoding">
<title></title>
<style>
</style>
</head>

<body>
<h3>Make a QR Code:</h3>

<form action="/QRMaker" method="POST" id="form1">
<label for="data">Data:</label>
<input type="text" id="data" name="data"><br>
<input type="submit" value="Submit">
</form>

<br><br>
<h3>Your QR Code:</h3>

<img src="data:image/png;base64,{{.Result}}" alt="QR Code">

</body>
</html>

## qrmaker.go
package qrmaker

import (
	_ "embed"
	"encoding/base64"
	"html/template"
	"log"
	"net/http"

	"github.com/GoogleCloudPlatform/functions-framework-go/functions"
	qrcode "github.com/skip2/go-qrcode"
)

type Page struct {
	Result string
}

//go:embed index.html
var index string

var (
	tmpl, _ = template.New("index").Parse(index)
)

func init() {
	functions.HTTP("QRMaker", QRMaker)
}

func QRMaker(w http.ResponseWriter, r *http.Request) {
	var res = Page{}

	if r.Method == "POST" {
		r.ParseForm()
		data := r.PostForm.Get("data")
		if data == "" {
			log.Println("no data supplied")
		}

		var png []byte

		var pngSize = 256
		if len(data) > 300 {
			pngSize = 430
		}

		png, err := qrcode.Encode(data, qrcode.Medium, pngSize)
		if err != nil {
			log.Println(err)
		}
		pngB64 := base64.StdEncoding.EncodeToString(png)
		res.Result = pngB64
	}

	err := tmpl.Execute(w, res)
	if err != nil {
		log.Println(err)
	}
}
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta content="text/html;charset=utf-8" http-equiv="Content-Type">
	<meta content="utf-8" http-equiv="encoding">
	<title></title>
	<style>
	</style>
	</head>

	<body>
	<h3>Make a QR Code:</h3>

	<form action="/QRMaker" method="POST" id="form1">
	<label for="data">Data:</label>
	<input type="text" id="data" name="data"><br>
	<input type="submit" value="Submit">
	</form>

	<br><br>
	<h3>Your QR Code:</h3>

	<img src="data:image/png;base64,{{.Result}}" alt="QR Code">

	</body>
	</html>
	package qrmaker

	import (
	_ "embed"
	"encoding/base64"
	"html/template"
	"log"
	"net/http"

	"github.com/GoogleCloudPlatform/functions-framework-go/functions"
	qrcode "github.com/skip2/go-qrcode"
	)

	type Page struct {
	Result string
	}

	//go:embed index.html
	var index string

	var (
	tmpl, _ = template.New("index").Parse(index)
	)

	func init() {
	functions.HTTP("QRMaker", QRMaker)
	}

	func QRMaker(w http.ResponseWriter, r *http.Request) {
	var res = Page{}

	if r.Method == "POST" {
	r.ParseForm()
	data := r.PostForm.Get("data")
	if data == "" {
	log.Println("no data supplied")
	}

	var png []byte

	var pngSize = 256
	if len(data) > 300 {
	pngSize = 430
	}

	png, err := qrcode.Encode(data, qrcode.Medium, pngSize)
	if err != nil {
	log.Println(err)
	}
	pngB64 := base64.StdEncoding.EncodeToString(png)
	res.Result = pngB64
	}

	err := tmpl.Execute(w, res)
	if err != nil {
	log.Println(err)
	}
	}