Steal certificates from Traefik

acme.go

package acme

import (
	"crypto/tls"
	"encoding/base64"
	"encoding/json"
	"io/ioutil"
)

type Cert struct {
	Domains struct {
		Main string
		SANs interface{}
	}
	Certificate struct {
		Domain        string
		CertURL       string
		CertStableURL string
		PrivateKey    string
		Certificate   string
	}
}

type Acme struct {
	DomainsCertificate struct {
		Certs []*Cert
	}
}

func (c *Cert) GetCertificate() (*tls.Certificate, error) {
	public, err := base64.StdEncoding.DecodeString(c.Certificate.Certificate)
	if err != nil {
		return nil, err
	}
	private, err := base64.StdEncoding.DecodeString(c.Certificate.PrivateKey)
	if err != nil {
		return nil, err
	}
	cert, err := tls.X509KeyPair(public, private)
	return &cert, err
}

func (a *Acme) CertificateByDomain(domain string) (*Cert, bool) {
	for _, cert := range a.DomainsCertificate.Certs {
		if cert.Certificate.Domain == domain {
			return cert, true
		}
	}
	return nil, false
}

func ReadFile(path string) (*Acme, error) {
	raw, err := ioutil.ReadFile(path)
	if err != nil {
		return nil, err
	}
	var acme Acme
	err = json.Unmarshal(raw, &acme)
	if err != nil {
		return nil, err
	}
	return &acme, nil
}