package main

import (
	"fmt"
	"io"
	"math/rand"
	"net/http"
	"os"
	"strings"
	"sync"
	"time"
)

func path() string {
	var str string
	for i := 0; i < 5; i++ {
		str += fmt.Sprintf("%x", rand.Intn(16))
	}
	return "http://gs.3g.cn/D/" + str + "/w"
}

const dir = "pics/"

func main() {
	var wg sync.WaitGroup
	for{
		wg.Add(100)
		for i:=0; i < 100; i++{
			go func() {
				p := path()
				resp, err := http.Get(p)
				if err != nil {
					fmt.Println("err")
				}
				urll := resp.Request.URL.String()
				if strings.HasPrefix(urll, "http://gs.3g.cn/D/"){
					wg.Done()
					return
				}
				urll = strings.Replace(urll, "&t=image/jpeg&w=100&h=200", "", -1)
				urll = strings.Replace(urll, "&t=image/png&w=100&h=200", "", -1)
				urll = strings.Replace(urll, "&t=application/zip&w=100&h=200", "", -1)
				urll = strings.Replace(urll, "&t=video/mp4&w=100&h=200", "", -1)

				urll = strings.Replace(urll, "/mms/v14/index.html?u=http%3A%2F%2Fgosms.gomocdn.com%2F", "/", -1)
				fmt.Println(urll)
				if strings.HasSuffix(urll,"200"){
					wg.Done()
					return
				}
				picres, _ := http.Get(urll)
				if strings.Contains(urll,"png"){
					pic, _ := os.Create(dir + time.Now().String()+ ".png")
					defer pic.Close()
					io.Copy(pic, picres.Body)
					wg.Done()
					return
				}
				if strings.Contains(urll,"jpg"){
					pic, _ := os.Create(dir + time.Now().String()+ ".jpg")
					defer pic.Close()
					io.Copy(pic, picres.Body)
					wg.Done()
					return
				}
				if strings.Contains(urll,"jpeg"){
					pic, _ := os.Create(dir + time.Now().String()+ ".jpeg")
					defer pic.Close()
					io.Copy(pic, picres.Body)
					wg.Done()
					return
				}
				if strings.Contains(urll,"zip"){
					pic, _ := os.Create(dir + time.Now().String()+ ".zip")
					defer pic.Close()
					io.Copy(pic, picres.Body)
					wg.Done()
					return
				}
				if strings.Contains(urll,"mp4"){
					pic, _ := os.Create(dir + time.Now().String()+ ".mp4")
					defer pic.Close()
					io.Copy(pic, picres.Body)
					wg.Done()
					return
				}
				wg.Done()
				return
			}()
		}
		wg.Wait()
	}
}