Add ACME store

Signed-off-by: Emile Vauge <emile@vauge.com>

acme/account.go

@@ -0,0 +1,176 @@
+package acme
+
+import (
+	"crypto"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/tls"
+	"crypto/x509"
+	"errors"
+	"github.com/containous/traefik/log"
+	"github.com/xenolf/lego/acme"
+	"reflect"
+	"sync"
+	"time"
+)
+
+// Account is used to store lets encrypt registration info
+type Account struct {
+	Email              string
+	Registration       *acme.RegistrationResource
+	PrivateKey         []byte
+	DomainsCertificate DomainsCertificates
+	ChallengeCerts     map[string][]byte
+}
+
+// Init inits acccount struct
+func (a *Account) Init() error {
+	err := a.DomainsCertificate.Init()
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func NewAccount(email string) (*Account, error) {
+	// Create a user. New accounts need an email and private key to start
+	privateKey, err := rsa.GenerateKey(rand.Reader, 4096)
+	if err != nil {
+		return nil, err
+	}
+	domainsCerts := DomainsCertificates{Certs: []*DomainsCertificate{}}
+	domainsCerts.Init()
+	return &Account{
+		Email:              email,
+		PrivateKey:         x509.MarshalPKCS1PrivateKey(privateKey),
+		DomainsCertificate: domainsCerts,
+		ChallengeCerts:     map[string][]byte{}}, nil
+}
+
+// GetEmail returns email
+func (a Account) GetEmail() string {
+	return a.Email
+}
+
+// GetRegistration returns lets encrypt registration resource
+func (a Account) GetRegistration() *acme.RegistrationResource {
+	return a.Registration
+}
+
+// GetPrivateKey returns private key
+func (a Account) GetPrivateKey() crypto.PrivateKey {
+	if privateKey, err := x509.ParsePKCS1PrivateKey(a.PrivateKey); err == nil {
+		return privateKey
+	}
+	log.Errorf("Cannot unmarshall private key %+v", a.PrivateKey)
+	return nil
+}
+
+// Certificate is used to store certificate info
+type Certificate struct {
+	Domain        string
+	CertURL       string
+	CertStableURL string
+	PrivateKey    []byte
+	Certificate   []byte
+}
+
+// DomainsCertificates stores a certificate for multiple domains
+type DomainsCertificates struct {
+	Certs []*DomainsCertificate
+	lock  sync.RWMutex
+}
+
+func (dc *DomainsCertificates) Init() error {
+	dc.lock.Lock()
+	defer dc.lock.Unlock()
+	for _, domainsCertificate := range dc.Certs {
+		tlsCert, err := tls.X509KeyPair(domainsCertificate.Certificate.Certificate, domainsCertificate.Certificate.PrivateKey)
+		if err != nil {
+			return err
+		}
+		domainsCertificate.tlsCert = &tlsCert
+	}
+	return nil
+}
+
+func (dc *DomainsCertificates) renewCertificates(acmeCert *Certificate, domain Domain) error {
+	dc.lock.Lock()
+	defer dc.lock.Unlock()
+
+	for _, domainsCertificate := range dc.Certs {
+		if reflect.DeepEqual(domain, domainsCertificate.Domains) {
+			tlsCert, err := tls.X509KeyPair(acmeCert.Certificate, acmeCert.PrivateKey)
+			if err != nil {
+				return err
+			}
+			domainsCertificate.Certificate = acmeCert
+			domainsCertificate.tlsCert = &tlsCert
+			return nil
+		}
+	}
+	return errors.New("Certificate to renew not found for domain " + domain.Main)
+}
+
+func (dc *DomainsCertificates) addCertificateForDomains(acmeCert *Certificate, domain Domain) (*DomainsCertificate, error) {
+	dc.lock.Lock()
+	defer dc.lock.Unlock()
+
+	tlsCert, err := tls.X509KeyPair(acmeCert.Certificate, acmeCert.PrivateKey)
+	if err != nil {
+		return nil, err
+	}
+	cert := DomainsCertificate{Domains: domain, Certificate: acmeCert, tlsCert: &tlsCert}
+	dc.Certs = append(dc.Certs, &cert)
+	return &cert, nil
+}
+
+func (dc *DomainsCertificates) getCertificateForDomain(domainToFind string) (*DomainsCertificate, bool) {
+	dc.lock.RLock()
+	defer dc.lock.RUnlock()
+	for _, domainsCertificate := range dc.Certs {
+		domains := []string{}
+		domains = append(domains, domainsCertificate.Domains.Main)
+		domains = append(domains, domainsCertificate.Domains.SANs...)
+		for _, domain := range domains {
+			if domain == domainToFind {
+				return domainsCertificate, true
+			}
+		}
+	}
+	return nil, false
+}
+
+func (dc *DomainsCertificates) exists(domainToFind Domain) (*DomainsCertificate, bool) {
+	dc.lock.RLock()
+	defer dc.lock.RUnlock()
+	for _, domainsCertificate := range dc.Certs {
+		if reflect.DeepEqual(domainToFind, domainsCertificate.Domains) {
+			return domainsCertificate, true
+		}
+	}
+	return nil, false
+}
+
+// DomainsCertificate contains a certificate for multiple domains
+type DomainsCertificate struct {
+	Domains     Domain
+	Certificate *Certificate
+	tlsCert     *tls.Certificate
+}
+
+func (dc *DomainsCertificate) needRenew() bool {
+	for _, c := range dc.tlsCert.Certificate {
+		crt, err := x509.ParseCertificate(c)
+		if err != nil {
+			// If there's an error, we assume the cert is broken, and needs update
+			return true
+		}
+		// <= 7 days left, renew certificate
+		if crt.NotAfter.Before(time.Now().Add(time.Duration(24 * 7 * time.Hour))) {
+			return true
+		}
+	}
+
+	return false
+}