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package acme

import (
	"crypto/rsa"
	"crypto/x509"
	"encoding/json"
	"encoding/pem"
	"fmt"
	"io/ioutil"
	"os"
)

// Dump ...
func Dump(v interface{}) error {
	body, err := json.MarshalIndent(v, "", "\t")
	if err != nil {
		return err
	}
	fmt.Println(string(body))
	return nil
}

// Print ...
func Print(v interface{}) (int, error) {
	return fmt.Printf("%+v\n", v)
}

// Save ...
func Save(fname string, v interface{}) error {
	body, err := json.MarshalIndent(v, "", "\t")
	if err != nil {
		return err
	}
	return ioutil.WriteFile(fname, body, 0644)
}

// SaveKey stores RSA private key into file
func SaveKey(fname string, key *rsa.PrivateKey) error {
	file, err := os.Create(fname)
	if err != nil {
		return err
	}
	defer file.Close()
	block := &pem.Block{
		Type:  "RSA PRIVATE KEY",
		Bytes: x509.MarshalPKCS1PrivateKey(key),
	}
	return pem.Encode(file, block)
}

// LoadKey loads RSA private key from file
func LoadKey(fname string) (*rsa.PrivateKey, error) {
	file, err := ioutil.ReadFile(fname)
	if err != nil {
		return nil, err
	}
	block, _ := pem.Decode(file)
	return x509.ParsePKCS1PrivateKey(block.Bytes)
}