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path: root/server_test.go
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package goxy

import (
	"bytes"
	"crypto/tls"
	"crypto/x509"
	"errors"
	"io"
	"io/ioutil"
	"log"
	"net/http"
	"net/http/httptest"
	"os"
	"strings"
	"testing"

	"golang.org/x/net/websocket"
)

type Cannary string

const (
	cannary   = Cannary("hello from backend")
	dataFile  = "test.json"
	wwwServer = "localhost:18080"
	tlsServer = "localhost:18443"
	rpcServer = "localhost:18000"
	cert      = `-----BEGIN CERTIFICATE-----
MIIBXjCCAQygAwIBAgIRAM03h8i2NyJ7sItcK4jU1eEwCgYIKoZIzj0EAwIwEjEQ
MA4GA1UEChMHQWNtZSBDbzAeFw0xNjAzMzExMzU5NTlaFw0yNjAzMjkxMzU5NTla
MBIxEDAOBgNVBAoTB0FjbWUgQ28wTjAQBgcqhkjOPQIBBgUrgQQAIQM6AATxB9y8
ZHzQayFNY2mrEaG7tgJKTSDOAvVSn8VsDldcZXwXuWEcNoi2LKAckCL9E2xc6bxz
AlZGXaNOMEwwDgYDVR0PAQH/BAQDAgKkMBMGA1UdJQQMMAoGCCsGAQUFBwMBMA8G
A1UdEwEB/wQFMAMBAf8wFAYDVR0RBA0wC4IJbG9jYWxob3N0MAoGCCqGSM49BAMC
A0AAMD0CHQDQCcNis9uY0lGbQ4o8qJByjd9GY3Bon3wmt/ULAhwI78yOXxyeDR1T
77Q2+pF/GmcDtCbwrVt3KpmI
-----END CERTIFICATE-----`
	key = `-----BEGIN EC PRIVATE KEY-----
MGgCAQEEHHvI0aSaXHcCugwEWoBJ9R1swGVeDbTYlikuv4+gBwYFK4EEACGhPAM6
AATxB9y8ZHzQayFNY2mrEaG7tgJKTSDOAvVSn8VsDldcZXwXuWEcNoi2LKAckCL9
E2xc6bxzAlZGXQ==
-----END EC PRIVATE KEY-----`
)

func init() {
	os.Remove(dataFile)
	server, err := NewServer(dataFile, wwwServer, tlsServer, rpcServer)
	if err != nil {
		log.Fatal(err)
	}
	go func() {
		if err := server.Start(); err != nil {
			log.Fatal(err)
		}
	}()
}

func get(uri string) (string, error) {
	caPool := x509.NewCertPool()
	caPool.AppendCertsFromPEM([]byte(cert))
	client := http.Client{
		Transport: &http.Transport{
			TLSClientConfig: &tls.Config{
				RootCAs: caPool,
			},
		},
	}
	resp, err := client.Get(uri)
	if err != nil {
		return "", err
	}
	if resp.StatusCode != http.StatusOK {
		return "", errors.New(resp.Status)
	}
	defer resp.Body.Close()
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return "", err
	}
	return string(body), nil
}

func add(r Route) error {
	client, err := DialRPC(rpcServer)
	if err != nil {
		return err
	}
	defer client.Close()
	return client.Call("GoXY.Add", r, nil)
}

func del(host string) error {
	client, err := DialRPC(rpcServer)
	if err != nil {
		return err
	}
	defer client.Close()
	return client.Call("GoXY.Del", host, nil)
}

func (c Cannary) ServeHTTP(w http.ResponseWriter, _ *http.Request) {
	io.WriteString(w, string(c))
}

func (c Cannary) Equal(s string) bool {
	return string(c) == s
}

func TestReverseProxy(t *testing.T) {
	backServer := httptest.NewServer(cannary)
	t.Log("run", backServer.URL)

	r := Route{
		Host:     "http://" + wwwServer,
		Upstream: backServer.URL,
	}
	t.Log("add", r.Host)
	if err := add(r); err != nil {
		t.Error(err)
	}

	// normal flow
	resp, err := get(r.Host)
	if err != nil {
		t.Error(err)
	}
	if !cannary.Equal(resp) {
		t.Errorf("normal: got %q expected %q", resp, cannary)
	}

	// backend closed -> 502
	backServer.Close()
	resp, err = get(r.Host)
	if err == nil || err.Error() != "502 Bad Gateway" {
		t.Errorf("closed: got %q expected %v", err, http.StatusBadGateway)
	}

	t.Log("del", r.Host)
	if err := del(r.Host); err != nil {
		t.Error(err)
	}

	// route removed -> 404
	resp, err = get(r.Host)
	if err == nil || err.Error() != "404 Not Found" {
		t.Errorf("removed: got %q expected %v", err, http.StatusNotFound)
	}
}

func TestReverseProxyTLS(t *testing.T) {
	backServer := httptest.NewServer(cannary)
	defer backServer.Close()
	t.Log("run", backServer.URL)

	r := Route{
		Host:     "https://" + tlsServer,
		Upstream: backServer.URL,
		Cert:     []byte(cert),
		Key:      []byte(key),
	}

	// test for "no cert" first
	_, err := get(r.Host)
	if err != nil && !strings.Contains(err.Error(), "internal error") {
		t.Error("no cert", err)
	}

	t.Log("add", r.Host)
	if err := add(r); err != nil {
		t.Error(err)
	}

	// normal flow
	resp, err := get(r.Host)
	if err != nil {
		t.Error(err)
	}
	if !cannary.Equal(resp) {
		t.Errorf("got %q expected %q", resp, cannary)
	}

	// cleanup
	t.Log("del", r.Host)
	if err := del(r.Host); err != nil {
		t.Error(err)
	}
}

func TestWebsocketProxy(t *testing.T) {
	wsServer := httptest.NewServer(websocket.Handler(func(ws *websocket.Conn) {
		io.Copy(ws, ws)
	}))
	defer wsServer.Close()
	t.Log("run", wsServer.URL)

	// Test WebSocket proxy
	r := Route{
		Host:     "ws://" + wwwServer,
		Upstream: wsServer.URL,
	}
	t.Log("add", r.Host)
	if err := add(r); err != nil {
		t.Error(err)
	}

	ws, err := websocket.Dial(r.Host, "", "http://localhost")
	if err != nil {
		t.Error(err)
	}
	defer ws.Close()

	if _, err := ws.Write([]byte(cannary)); err != nil {
		t.Error(err)
	}
	msg := make([]byte, len(cannary))
	if _, err := ws.Read(msg); err != nil {
		t.Error(err)
	}
	if !bytes.Equal(msg, []byte(cannary)) {
		t.Errorf("got %q expected %q", string(msg), cannary)
	}

	t.Log("del", r.Host)
	if err := del(r.Host); err != nil {
		t.Error(err)
	}
}