package main
import (
"context"
"flag"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
cdp "github.com/knq/chromedp"
)
var (
flagPort = flag.Int("port", 8544, "port")
)
func main() {
var err error
flag.Parse()
// create http server and result channel
result := make(chan int, 1)
mux := http.NewServeMux()
mux.HandleFunc("/", func(res http.ResponseWriter, req *http.Request) {
fmt.Fprintf(res, uploadHTML)
})
mux.HandleFunc("/upload", func(res http.ResponseWriter, req *http.Request) {
f, _, err := req.FormFile("upload")
if err != nil {
http.Error(res, err.Error(), http.StatusBadRequest)
return
}
defer f.Close()
buf, err := ioutil.ReadAll(f)
if err != nil {
http.Error(res, err.Error(), http.StatusBadRequest)
return
}
fmt.Fprintf(res, resultHTML, len(buf))
result <- len(buf)
})
go http.ListenAndServe(fmt.Sprintf(":%d", *flagPort), mux)
// create context
ctxt, cancel := context.WithCancel(context.Background())
defer cancel()
// create chrome instance
c, err := cdp.New(ctxt, cdp.WithLog(log.Printf))
if err != nil {
log.Fatal(err)
}
// get wd
wd, err := os.Getwd()
if err != nil {
log.Fatal(err)
}
filepath := wd + "/main.go"
// get some info about the file
fi, err := os.Stat(filepath)
if err != nil {
log.Fatal(err)
}
// run task list
var sz string
err = c.Run(ctxt, upload(filepath, &sz))
if err != nil {
log.Fatal(err)
}
// shutdown chrome
err = c.Shutdown(ctxt)
if err != nil {
log.Fatal(err)
}
// wait for chrome to finish
err = c.Wait()
if err != nil {
log.Fatal(err)
}
log.Printf("original size: %d, upload size: %d", fi.Size(), <-result)
}
func upload(filepath string, sz *string) cdp.Tasks {
return cdp.Tasks{
cdp.Navigate(fmt.Sprintf("http://localhost:%d", *flagPort)),
cdp.SendKeys(`input[name="upload"]`, filepath, cdp.NodeVisible),
cdp.Click(`input[name="submit"]`),
cdp.Text(`#result`, sz, cdp.ByID, cdp.NodeVisible),
}
}
const (
uploadHTML = `
`
resultHTML = `
%d
`
)