Google Play Application Version Checker

main.go

package main

import (
	"flag"
	"fmt"
	"io/ioutil"
	"net/http"
	"regexp"
	"strings"
)

const GooglePlayApplicationURLPrefix = "https://play.google.com/store/apps/details"

var (
	id = flag.String("id", "", "google play application id")
	regex = regexp.MustCompile(`<div class="content" itemprop="softwareVersion">(.*?)</div>`)
)

func main() {
	flag.Parse()
	url := fmt.Sprintf("%s?id=%s", GooglePlayApplicationURLPrefix, *id)
	res, err := http.Get(url)
	if err ! = nil {
		fmt.Printf("Request error: %v", err)
		return
	}
	defer res.Body.Close()
	body, err := ioutil.ReadAll(res.Body)
	if err != nil {
		fmt.Printf("Response Body read error: %v", err)
		return
	}
	version := strings.Trim(regex.FindStringSubmatch(string(body))[1])
	fmt.Println("Current Version: %s", version)
}