Refactor test oidc provider into its own package

This makes it easier to test other OIDC code.

plugin/pkg/auth/authenticator/token/oidc/testing/provider.go

@@ -0,0 +1,172 @@
+/*
+Copyright 2016 The Kubernetes Authors 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 testing
+
+import (
+	"bytes"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/tls"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/json"
+	"encoding/pem"
+	"fmt"
+	"io/ioutil"
+	"math/big"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"github.com/coreos/go-oidc/jose"
+	"github.com/coreos/go-oidc/key"
+	"github.com/coreos/go-oidc/oidc"
+)
+
+// NewOIDCProvider provides a bare minimum OIDC IdP Server useful for testing.
+func NewOIDCProvider(t *testing.T) *OIDCProvider {
+	privKey, err := key.GeneratePrivateKey()
+	if err != nil {
+		t.Fatalf("Cannot create OIDC Provider: %v", err)
+		return nil
+	}
+
+	op := &OIDCProvider{
+		Mux:     http.NewServeMux(),
+		PrivKey: privKey,
+	}
+
+	op.Mux.HandleFunc("/.well-known/openid-configuration", op.handleConfig)
+	op.Mux.HandleFunc("/keys", op.handleKeys)
+
+	return op
+}
+
+type OIDCProvider struct {
+	Mux     *http.ServeMux
+	PCFG    oidc.ProviderConfig
+	PrivKey *key.PrivateKey
+}
+
+func (op *OIDCProvider) ServeTLSWithKeyPair(cert, key string) (*httptest.Server, error) {
+	srv := httptest.NewUnstartedServer(op.Mux)
+
+	srv.TLS = &tls.Config{Certificates: make([]tls.Certificate, 1)}
+	var err error
+	srv.TLS.Certificates[0], err = tls.LoadX509KeyPair(cert, key)
+	if err != nil {
+		return nil, fmt.Errorf("Cannot load cert/key pair: %v", err)
+	}
+	srv.StartTLS()
+	return srv, nil
+}
+
+func (op *OIDCProvider) handleConfig(w http.ResponseWriter, req *http.Request) {
+	b, err := json.Marshal(&op.PCFG)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	w.Write(b)
+}
+
+func (op *OIDCProvider) handleKeys(w http.ResponseWriter, req *http.Request) {
+	keys := struct {
+		Keys []jose.JWK `json:"keys"`
+	}{
+		Keys: []jose.JWK{op.PrivKey.JWK()},
+	}
+
+	b, err := json.Marshal(keys)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Cache-Control", fmt.Sprintf("public, max-age=%d", int(time.Hour.Seconds())))
+	w.Header().Set("Expires", time.Now().Add(time.Hour).Format(time.RFC1123))
+	w.Header().Set("Content-Type", "application/json")
+	w.Write(b)
+}
+
+// generateSelfSignedCert generates a self-signed cert/key pairs and writes to the certPath/keyPath.
+// This method is mostly identical to crypto.GenerateSelfSignedCert except for the 'IsCA' and 'KeyUsage'
+// in the certificate template. (Maybe we can merge these two methods).
+func GenerateSelfSignedCert(t *testing.T, host, certPath, keyPath string) {
+	priv, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	template := x509.Certificate{
+		SerialNumber: big.NewInt(1),
+		Subject: pkix.Name{
+			CommonName: fmt.Sprintf("%s@%d", host, time.Now().Unix()),
+		},
+		NotBefore: time.Now(),
+		NotAfter:  time.Now().Add(time.Hour * 24 * 365),
+
+		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
+		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
+		BasicConstraintsValid: true,
+		IsCA: true,
+	}
+
+	if ip := net.ParseIP(host); ip != nil {
+		template.IPAddresses = append(template.IPAddresses, ip)
+	} else {
+		template.DNSNames = append(template.DNSNames, host)
+	}
+
+	derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Generate cert
+	certBuffer := bytes.Buffer{}
+	if err := pem.Encode(&certBuffer, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes}); err != nil {
+		t.Fatal(err)
+	}
+
+	// Generate key
+	keyBuffer := bytes.Buffer{}
+	if err := pem.Encode(&keyBuffer, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)}); err != nil {
+		t.Fatal(err)
+	}
+
+	// Write cert
+	if err := os.MkdirAll(filepath.Dir(certPath), os.FileMode(0755)); err != nil {
+		t.Fatal(err)
+	}
+	if err := ioutil.WriteFile(certPath, certBuffer.Bytes(), os.FileMode(0644)); err != nil {
+		t.Fatal(err)
+	}
+
+	// Write key
+	if err := os.MkdirAll(filepath.Dir(keyPath), os.FileMode(0755)); err != nil {
+		t.Fatal(err)
+	}
+	if err := ioutil.WriteFile(keyPath, keyBuffer.Bytes(), os.FileMode(0600)); err != nil {
+		t.Fatal(err)
+	}
+}