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// Copyright 2020 Google LLC All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package httptest provides a method for testing a TLS server a la net/http/httptest.
package httptest
import (
"bytes"
"context"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/tls"
"crypto/x509"
"encoding/pem"
"math/big"
"net"
"net/http"
"net/http/httptest"
"time"
)
// NewTLSServer returns an httptest server, with an http client that has been configured to
// send all requests to the returned server. The TLS certs are generated for the given domain.
// If you need a transport, Client().Transport is correctly configured.
func NewTLSServer(domain string, handler http.Handler) (*httptest.Server, error) {
s := httptest.NewUnstartedServer(handler)
template := x509.Certificate{
SerialNumber: big.NewInt(1),
NotBefore: time.Now().Add(-1 * time.Hour),
NotAfter: time.Now().Add(time.Hour),
IPAddresses: []net.IP{
net.IPv4(127, 0, 0, 1),
net.IPv6loopback,
},
DNSNames: []string{domain},
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
IsCA: true,
}
priv, err := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
if err != nil {
return nil, err
}
b, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
if err != nil {
return nil, err
}
pc := &bytes.Buffer{}
if err := pem.Encode(pc, &pem.Block{Type: "CERTIFICATE", Bytes: b}); err != nil {
return nil, err
}
ek, err := x509.MarshalECPrivateKey(priv)
if err != nil {
return nil, err
}
pk := &bytes.Buffer{}
if err := pem.Encode(pk, &pem.Block{Type: "EC PRIVATE KEY", Bytes: ek}); err != nil {
return nil, err
}
c, err := tls.X509KeyPair(pc.Bytes(), pk.Bytes())
if err != nil {
return nil, err
}
s.TLS = &tls.Config{
Certificates: []tls.Certificate{c},
}
s.StartTLS()
certpool := x509.NewCertPool()
certpool.AddCert(s.Certificate())
t := &http.Transport{
TLSClientConfig: &tls.Config{
RootCAs: certpool,
},
DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
return net.Dial(s.Listener.Addr().Network(), s.Listener.Addr().String())
},
}
s.Client().Transport = t
return s, nil
}
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