package main

import (
	"archive/zip"
	"crypto/sha256"
	"fmt"
	"io"
	"os"
	"sort"
)

func main() {
	out, err := os.OpenFile(os.Getenv("out"), os.O_CREATE|os.O_RDWR, 0666)
	if err != nil {
		panic(err)
	}

	var files []string

	f, err := zip.OpenReader(os.Getenv("src"))
	if err != nil {
		panic(err)
	}

	for _, file := range f.File {
		if file.Mode().IsDir() {
			continue
		}

		files = append(files, file.Name)
	}

	sort.Strings(files)
	for _, rel := range files {
		f, err := f.Open(rel)
		if err != nil {
			panic(err)
		}
		defer f.Close()

		hash := sha256.New()
		_, err = io.Copy(hash, f)
		if err != nil {
			panic(err)
		}

		fmt.Fprintf(out, "%x  %s\n", hash.Sum(nil), rel)
	}

	out.Close()
	f.Close()
}