/*
Copyright 2017 The Kubernetes Authors.

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 pki

import (
	"bytes"
	"crypto/rsa"
	"crypto/x509"
	"crypto/x509/pkix"
	"encoding/pem"
	"testing"
)

func TestGenerateCertificate(t *testing.T) {
	data := "-----BEGIN RSA PRIVATE KEY-----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\nY/C1Lox4f1ROJnCjc/hfcOjcxX5M8A8peecHWlVtUPKTJgxQ7oMKcw==\n-----END RSA PRIVATE KEY-----\n"
	publicKeyData := "-----BEGIN RSA PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4JwpEprZ5n8RIEt6jT2l\nAh+UDgRgx/4px21gjgywQivYHVxHAZexVb/E9pBa9Q2G9B1Q7TCO7YsUVRQy4JMD\nZVt+McFnWVwexnqBYFNcVjkEmDgAgvCYGE0P9d/RwRL4KuLHo+u6fv7P0jXMN+Cp\nOxyLhYZZNa0ZOZDHsSiJSQSj9WGFGHrbCf0KVDpKieR1uBqHrRO+mLR5zkX2L58m\n74kjK4dsBhmjeq/7OAoTmiG2QgJ/P2IjyhiA2mRqY+hl55lwEUV/0yHYEkJC8LdG\nkwwZz2eF77aSPGmi/A2CSKgMwDTx9m+P7jcpWreYw6NG9BueGoDIve/tgFKwvVFF\n6QIDAQAB\n-----END RSA PUBLIC KEY-----\n"

	key, err := ParsePEMPrivateKey([]byte(data))
	if err != nil {
		t.Fatalf("error from ParsePEMPrivateKey: %v", err)
	}

	{
		var b bytes.Buffer
		pkData, err := x509.MarshalPKIXPublicKey(key.Key.(*rsa.PrivateKey).Public())
		if err != nil {
			t.Fatalf("error from MarshalPKIXPublicKey: %v", err)
		}
		if err := pem.Encode(&b, &pem.Block{Type: "RSA PUBLIC KEY", Bytes: pkData}); err != nil {
			t.Fatalf("error serializing public key")
		}

		if b.String() != publicKeyData {
			t.Fatalf("unexpected output from pem Encode: %q", b.String())
		}
	}

	subject := &pkix.Name{
		CommonName: "kubernetes",
	}

	template := &x509.Certificate{
		Subject:               *subject,
		KeyUsage:              x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
		ExtKeyUsage:           []x509.ExtKeyUsage{},
		BasicConstraintsValid: true,
		IsCA:                  true,
	}

	cert, err := SignNewCertificate(key, template, nil, nil)
	if err != nil {
		t.Fatalf("error from SignNewCertificate: %v", err)
	}

	{
		var b bytes.Buffer
		pkData, err := x509.MarshalPKIXPublicKey(cert.PublicKey)
		if err != nil {
			t.Fatalf("error from MarshalPKIXPublicKey: %v", err)
		}
		if err := pem.Encode(&b, &pem.Block{Type: "RSA PUBLIC KEY", Bytes: pkData}); err != nil {
			t.Fatalf("error serializing public key")
		}

		if b.String() != publicKeyData {
			t.Fatalf("unexpected output from pem Encode: %q", b.String())
		}
	}
}

func TestCertificateRoundTrip(t *testing.T) {
	data := "-----BEGIN CERTIFICATE-----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\n8yGeRx9AbknHh4Ia\n-----END CERTIFICATE-----\n"

	cert, err := ParsePEMCertificate([]byte(data))
	if err != nil {
		t.Fatalf("error from ParsePEMCertificate: %v", err)
	}

	var b bytes.Buffer
	if _, err := cert.WriteTo(&b); err != nil {
		t.Fatalf("error from Certificate WriteTo: %v", err)
	}

	if b.String() != data {
		t.Fatalf("unexpected output from Certificate WriteTo: %q", b.String())
	}
}