print an infohash

main.go

package main

import (
	"crypto/sha1"
	"fmt"
	"io/ioutil"
	"log"
	"net/url"

	"github.com/chihaya/bencode"
)

func main() {
	file, err := ioutil.ReadFile("/Users/jimi/example.json.torrent")
	if err != nil {
		log.Fatal(err)
	}

	i, err := bencode.Unmarshal(file)
	if err != nil {
		log.Fatal(err)
	}

	fileDict, ok := i.(bencode.Dict)
	if !ok {
		log.Fatal(err)
	}

	sha := sha1.New()
	e := bencode.NewEncoder(sha)
	err = e.Encode(fileDict["info"])
	if err != nil {
		log.Fatal(err)
	}

	fmt.Printf("Infohash: %x\n", sha.Sum(nil))
	fmt.Println("EscapedInfohash: ", url.QueryEscape(string(sha.Sum(nil))))
}