package main

import (
	"fmt"
	"os"
	"encoding/pem"
	"crypto/x509"

	"github.com/alexflint/go-arg"
)

func run(args *Arguments) error {
	raw, err := os.ReadFile(args.Input)
	if err != nil {
		return err
	}

	block, rest := pem.Decode(raw)
	fmt.Println(block.Type)
	fmt.Println("len(rest):", len(rest))

	cert, err := x509.ParseCertificate(block.Bytes)
	if err != nil {
		return err
	}

	fmt.Println(cert)
	return nil
}

type Arguments struct {
	Input string `arg:"positional,required"`
}

func main() {
	args := &Arguments{}
	arg.MustParse(args)

	err := run(args)
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
}