/*
   Copyright 2014 CoreOS, Inc.

   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 transport

import (
	"crypto/tls"
	"errors"
	"io/ioutil"
	"os"
	"testing"
)

func createTempFile(b []byte) (string, error) {
	f, err := ioutil.TempFile("", "etcd-test-tls-")
	if err != nil {
		return "", err
	}
	defer f.Close()

	if _, err = f.Write(b); err != nil {
		return "", err
	}

	return f.Name(), nil
}

func fakeCertificateParserFunc(cert tls.Certificate, err error) func(certPEMBlock, keyPEMBlock []byte) (tls.Certificate, error) {
	return func(certPEMBlock, keyPEMBlock []byte) (tls.Certificate, error) {
		return cert, err
	}
}

func TestNewTransportTLSInfo(t *testing.T) {
	tmp, err := createTempFile([]byte("XXX"))
	if err != nil {
		t.Fatalf("Unable to prepare tmpfile: %v", err)
	}
	defer os.Remove(tmp)

	tests := []TLSInfo{
		TLSInfo{},
		TLSInfo{
			CertFile: tmp,
			KeyFile:  tmp,
		},
		TLSInfo{
			CertFile: tmp,
			KeyFile:  tmp,
			CAFile:   tmp,
		},
		TLSInfo{
			CAFile: tmp,
		},
	}

	for i, tt := range tests {
		tt.parseFunc = fakeCertificateParserFunc(tls.Certificate{}, nil)
		trans, err := NewTransport(tt)
		if err != nil {
			t.Fatalf("Received unexpected error from NewTransport: %v", err)
		}

		if trans.TLSClientConfig == nil {
			t.Fatalf("#%d: want non-nil TLSClientConfig", i)
		}
	}
}

func TestTLSInfoEmpty(t *testing.T) {
	tests := []struct {
		info TLSInfo
		want bool
	}{
		{TLSInfo{}, true},
		{TLSInfo{CAFile: "baz"}, true},
		{TLSInfo{CertFile: "foo"}, false},
		{TLSInfo{KeyFile: "bar"}, false},
		{TLSInfo{CertFile: "foo", KeyFile: "bar"}, false},
		{TLSInfo{CertFile: "foo", CAFile: "baz"}, false},
		{TLSInfo{KeyFile: "bar", CAFile: "baz"}, false},
		{TLSInfo{CertFile: "foo", KeyFile: "bar", CAFile: "baz"}, false},
	}

	for i, tt := range tests {
		got := tt.info.Empty()
		if tt.want != got {
			t.Errorf("#%d: result of Empty() incorrect: want=%t got=%t", i, tt.want, got)
		}
	}
}

func TestTLSInfoMissingFields(t *testing.T) {
	tmp, err := createTempFile([]byte("XXX"))
	if err != nil {
		t.Fatalf("Unable to prepare tmpfile: %v", err)
	}
	defer os.Remove(tmp)

	tests := []TLSInfo{
		TLSInfo{CertFile: tmp},
		TLSInfo{KeyFile: tmp},
		TLSInfo{CertFile: tmp, CAFile: tmp},
		TLSInfo{KeyFile: tmp, CAFile: tmp},
	}

	for i, info := range tests {
		if _, err := info.ServerConfig(); err == nil {
			t.Errorf("#%d: expected non-nil error from ServerConfig()", i)
		}

		if _, err = info.ClientConfig(); err == nil {
			t.Errorf("#%d: expected non-nil error from ClientConfig()", i)
		}
	}
}

func TestTLSInfoParseFuncError(t *testing.T) {
	tmp, err := createTempFile([]byte("XXX"))
	if err != nil {
		t.Fatalf("Unable to prepare tmpfile: %v", err)
	}
	defer os.Remove(tmp)

	info := TLSInfo{CertFile: tmp, KeyFile: tmp, CAFile: tmp}
	info.parseFunc = fakeCertificateParserFunc(tls.Certificate{}, errors.New("fake"))

	if _, err := info.ServerConfig(); err == nil {
		t.Errorf("expected non-nil error from ServerConfig()")
	}

	if _, err = info.ClientConfig(); err == nil {
		t.Errorf("expected non-nil error from ClientConfig()")
	}
}

func TestTLSInfoConfigFuncs(t *testing.T) {
	tmp, err := createTempFile([]byte("XXX"))
	if err != nil {
		t.Fatalf("Unable to prepare tmpfile: %v", err)
	}
	defer os.Remove(tmp)

	tests := []struct {
		info       TLSInfo
		clientAuth tls.ClientAuthType
		wantCAs    bool
	}{
		{
			info:       TLSInfo{CertFile: tmp, KeyFile: tmp},
			clientAuth: tls.NoClientCert,
			wantCAs:    false,
		},

		{
			info:       TLSInfo{CertFile: tmp, KeyFile: tmp, CAFile: tmp},
			clientAuth: tls.RequireAndVerifyClientCert,
			wantCAs:    true,
		},
	}

	for i, tt := range tests {
		tt.info.parseFunc = fakeCertificateParserFunc(tls.Certificate{}, nil)

		sCfg, err := tt.info.ServerConfig()
		if err != nil {
			t.Errorf("#%d: expected nil error from ServerConfig(), got non-nil: %v", i, err)
		}

		if tt.wantCAs != (sCfg.ClientCAs != nil) {
			t.Errorf("#%d: wantCAs=%t but ClientCAs=%v", i, tt.wantCAs, sCfg.ClientCAs)
		}

		cCfg, err := tt.info.ClientConfig()
		if err != nil {
			t.Errorf("#%d: expected nil error from ClientConfig(), got non-nil: %v", i, err)
		}

		if tt.wantCAs != (cCfg.RootCAs != nil) {
			t.Errorf("#%d: wantCAs=%t but RootCAs=%v", i, tt.wantCAs, sCfg.RootCAs)
		}
	}
}