test.go

package main

import (
	"fmt"
	"os"
	"strings"

	"github.com/aws/aws-sdk-go/service/cloudfront/sign"
	"github.com/pkg/errors"
	"github.com/urfave/cli"
)

const (
	FlagCloudfrontPrivateKey = "cloudfront.signer.private_key"
)

func runApp(c *cli.Context) error {
	cloudfrontPrivateKeyAsString := c.String(FlagCloudfrontPrivateKey)
	fmt.Printf("XXX")
	fmt.Printf(cloudfrontPrivateKeyAsString)
	fmt.Printf("XXX")
	cloudfrontPrivateKey, err := sign.LoadPEMPrivKey(strings.NewReader(cloudfrontPrivateKeyAsString + "\n"))
	if err != nil {
		panic(errors.Wrap(err, "failed to cloudfront signer"))
	}
	fmt.Println(cloudfrontPrivateKey)
	return nil
}

func main() {
	fmt.Printf("hello, world\n")
	app := cli.NewApp()
	app.Name = "app"
	app.Usage = "Usage"
	app.Flags = []cli.Flag{
		&cli.StringFlag{
			Name:   FlagCloudfrontPrivateKey,
			Usage:  "Private key for cloudfront url signing",
			EnvVar: "CLOUDFRONT_SIGNING_PRIVATE_KEY",
		},
	}
	app.Action = runApp
	app.Run(os.Args)
}