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path: root/desire.go
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package acme

import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/tls"
	"crypto/x509"
	"crypto/x509/pkix"
	"encoding/base64"
)

type Desire struct {
	cert     tls.Certificate
	altnames []string
	solver   map[ChalType]Solver
}

func NewDesire(altnames []string, size int) (*Desire, error) {
	key, err := rsa.GenerateKey(rand.Reader, size)
	if err != nil {
		return nil, err
	}
	return &Desire{
		cert:     tls.Certificate{PrivateKey: key},
		altnames: altnames,
		solver:   make(map[ChalType]Solver),
	}, nil
}

func (d *Desire) RegisterSolver(s Solver) {
	d.solver[s.Type()] = s
}

func (d *Desire) HasSolver() bool {
	return len(d.solver) > 0
}

func (d *Desire) CSR() (string, error) {
	tmpl := x509.CertificateRequest{
		Subject: pkix.Name{CommonName: d.altnames[0]},
	}
	if len(d.altnames) > 1 {
		tmpl.DNSNames = d.altnames
	}
	der, err := x509.CreateCertificateRequest(rand.Reader, &tmpl, d.cert.PrivateKey)
	if err != nil {
		return "", err
	}
	return base64.RawURLEncoding.EncodeToString(der), nil
}

func (d *Desire) LoadKeyPair(certFile, keyFile string) (err error) {
	d.cert, err = tls.LoadX509KeyPair(certFile, keyFile)
	return
}

func (d *Desire) SaveKeyPair(certFile, keyFile string) error {
	if err := d.saveKey(keyFile); err != nil {
		return err
	}
	return d.saveCert(certFile)
}

func (d *Desire) saveKey(fname string) error {
	fd, err := CreateFile(fname, 0600)
	if err != nil {
		return err
	}
	defer fd.Close()
	return SaveKey(fd, d.cert.PrivateKey)
}

func (d *Desire) saveCert(fname string) error {
	fd, err := CreateFile(fname, 0644)
	if err != nil {
		return err
	}
	defer fd.Close()
	for _, crt := range d.cert.Certificate {
		if err := saveCert(fd, crt); err != nil {
			return err
		}
	}
	return nil
}