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package goxy

import (
	"crypto/tls"
	"crypto/x509"
	"fmt"
	"net/http"
)

// Certs holds certificates
type Certs map[string]*tls.Certificate

// GetCertificate returns certificate for SNI negotiation
func (c Certs) getCertificate(h *tls.ClientHelloInfo) (*tls.Certificate, error) {
	if v, ok := c[h.ServerName]; ok {
		return v, nil
	}
	return nil, fmt.Errorf("no cert for %q", h.ServerName)
}

func (c Certs) addCertificate(cert, key []byte) error {
	crt, err := tls.X509KeyPair(cert, key)
	if err != nil {
		return err
	}
	crt.Leaf, err = x509.ParseCertificate(crt.Certificate[0])
	if err != nil {
		return err
	}
	if cn := crt.Leaf.Subject.CommonName; cn != "" {
		c[cn] = &crt
	}
	for _, name := range crt.Leaf.DNSNames {
		c[name] = &crt
	}
	for _, ip := range crt.Leaf.IPAddresses {
		c[ip.String()] = &crt
	}
	return nil
}

func (c Certs) ServeHTTP(w http.ResponseWriter, _ *http.Request) {
	for k, v := range c {
		fmt.Fprintf(w, "%v: valid untill %v\n", k, v.Leaf.NotAfter)
	}
}