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package api
import (
"crypto/x509"
"net/http"
"strings"
"github.com/smallstep/certificates/api/render"
"github.com/smallstep/certificates/authority"
"github.com/smallstep/certificates/errs"
)
const (
authorizationHeader = "Authorization"
bearerScheme = "Bearer"
)
// Renew uses the information of certificate in the TLS connection to create a
// new one.
func Renew(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
// Get the leaf certificate from the peer or the token.
cert, token, err := getPeerCertificate(r)
if err != nil {
render.Error(w, r, err)
return
}
// The token can be used by RAs to renew a certificate.
if token != "" {
ctx = authority.NewTokenContext(ctx, token)
logOtt(w, token)
}
a := mustAuthority(ctx)
certChain, err := a.RenewContext(ctx, cert, nil)
if err != nil {
render.Error(w, r, errs.Wrap(http.StatusInternalServerError, err, "cahandler.Renew"))
return
}
certChainPEM := certChainToPEM(certChain)
var caPEM Certificate
if len(certChainPEM) > 1 {
caPEM = certChainPEM[1]
}
LogCertificate(w, certChain[0])
render.JSONStatus(w, r, &SignResponse{
ServerPEM: certChainPEM[0],
CaPEM: caPEM,
CertChainPEM: certChainPEM,
TLSOptions: a.GetTLSOptions(),
}, http.StatusCreated)
}
func getPeerCertificate(r *http.Request) (*x509.Certificate, string, error) {
if r.TLS != nil && len(r.TLS.PeerCertificates) > 0 {
return r.TLS.PeerCertificates[0], "", nil
}
if s := r.Header.Get(authorizationHeader); s != "" {
if parts := strings.SplitN(s, bearerScheme+" ", 2); len(parts) == 2 {
ctx := r.Context()
peer, err := mustAuthority(ctx).AuthorizeRenewToken(ctx, parts[1])
return peer, parts[1], err
}
}
return nil, "", errs.BadRequest("missing client certificate")
}
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