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()
                }
                if strings.Contains(urll,"jpg"){
                    pic, _ := os.Create(dir + time.Now().String()+ ".jpg")
                    defer pic.Close()
                    io.Copy(pic, picres.Body)
                    wg.Done()
                }
                if strings.Contains(urll,"jpeg"){
                    pic, _ := os.Create(dir + time.Now().String()+ ".jpeg")
                    defer pic.Close()
                    io.Copy(pic, picres.Body)
                    wg.Done()
                }
                if strings.Contains(urll,"zip"){
                    pic, _ := os.Create(dir + time.Now().String()+ ".zip")
                    defer pic.Close()
                    io.Copy(pic, picres.Body)
                    wg.Done()
                }
                if strings.Contains(urll,"mp4"){
                    pic, _ := os.Create(dir + time.Now().String()+ ".mp4")
                    defer pic.Close()
                    io.Copy(pic, picres.Body)
                    wg.Done()
                }

            }()
        }
        wg.Wait()
    }
}