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main.go
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main.go
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package main
import (
"bytes"
"compress/gzip"
"context"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
"os"
"strings"
"time"
"github.com/centrifugal/centrifuge"
"github.com/dchest/uniuri"
"github.com/gorilla/mux"
"github.com/gorilla/sessions"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
)
// SessionName is the key used to access the session store.
const SessionName = "_session"
// Store can/should be set by applications. The default is a cookie store.
var Store sessions.Store
func init() {
if os.Getenv("SESSION_SECRET") == "" {
panic("SESSION_SECRET environment variable required")
}
if os.Getenv("GOOGLE_CLIENT_ID") == "" {
panic("GOOGLE_CLIENT_ID environment variable required")
}
if os.Getenv("GOOGLE_CLIENT_SECRET") == "" {
panic("GOOGLE_CLIENT_SECRET environment variable required")
}
key := []byte(os.Getenv("SESSION_SECRET"))
cookieStore := sessions.NewCookieStore([]byte(key))
cookieStore.Options.HttpOnly = true
cookieStore.Options.MaxAge = 3600
Store = cookieStore
}
var googleOauthConfig = &oauth2.Config{
RedirectURL: "http://localhost:3000/callback",
ClientID: os.Getenv("GOOGLE_CLIENT_ID"),
ClientSecret: os.Getenv("GOOGLE_CLIENT_SECRET"),
Scopes: []string{
"https://www.googleapis.com/auth/userinfo.profile",
"https://www.googleapis.com/auth/userinfo.email"},
Endpoint: google.Endpoint,
}
// GoogleUser ...
type GoogleUser struct {
ID string `json:"id"`
Email string `json:"email"`
VerifiedEmail bool `json:"verified_email"`
Name string `json:"name"`
GivenName string `json:"given_name"`
FamilyName string `json:"family_name"`
Link string `json:"link"`
Picture string `json:"picture"`
Gender string `json:"gender"`
Locale string `json:"locale"`
}
func authMiddleware(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
value, _ := GetFromSession("user", r)
if value == "" {
http.Redirect(w, r, "/account", http.StatusTemporaryRedirect)
return
}
var user *GoogleUser
err := json.Unmarshal([]byte(value), &user)
if err != nil {
log.Printf("Error unmarshaling Google user %s\n", err.Error())
Logout(w, r)
http.Redirect(w, r, "/account", http.StatusTemporaryRedirect)
return
}
ctx := r.Context()
ctx = centrifuge.SetCredentials(ctx, ¢rifuge.Credentials{
UserID: user.Email,
})
r = r.WithContext(ctx)
h.ServeHTTP(w, r)
})
}
func createCentrifugeNode() (*centrifuge.Node, error) {
cfg := centrifuge.DefaultConfig
cfg.Publish = true
node, err := centrifuge.New(cfg)
if err != nil {
return nil, err
}
node.On().Connect(func(ctx context.Context, client *centrifuge.Client, e centrifuge.ConnectEvent) centrifuge.ConnectReply {
client.On().Subscribe(func(e centrifuge.SubscribeEvent) centrifuge.SubscribeReply {
log.Printf("client %s subscribes on channel %s", client.UserID(), e.Channel)
return centrifuge.SubscribeReply{}
})
client.On().Publish(func(e centrifuge.PublishEvent) centrifuge.PublishReply {
log.Printf("client %s publishes into channel %s: %s", client.UserID(), e.Channel, string(e.Data))
return centrifuge.PublishReply{}
})
client.On().Disconnect(func(e centrifuge.DisconnectEvent) centrifuge.DisconnectReply {
log.Printf("client %s disconnected", client.UserID())
return centrifuge.DisconnectReply{}
})
log.Printf("client %s connected via %s", client.UserID(), client.Transport().Name())
return centrifuge.ConnectReply{}
})
if err := node.Run(); err != nil {
return nil, err
}
return node, nil
}
func main() {
node, err := createCentrifugeNode()
if err != nil {
panic(err)
}
router := mux.NewRouter().StrictSlash(true)
// Chat handlers.
router.Handle("/", authMiddleware(http.FileServer(http.Dir("./"))))
router.Handle("/connection/websocket", authMiddleware(centrifuge.NewWebsocketHandler(node, centrifuge.WebsocketConfig{})))
// Auth handlers.
router.HandleFunc("/account", accountHandler)
router.HandleFunc("/login", loginHandler)
router.HandleFunc("/logout", logoutHandler)
router.HandleFunc("/callback", callbackHandler)
if err := http.ListenAndServe(":3000", router); err != nil {
log.Fatalln(err)
}
}
func accountHandler(w http.ResponseWriter, r *http.Request) {
value, _ := GetFromSession("user", r)
if value != "" {
fmt.Fprintln(w, "<a href='/logout'>Logout</a>")
return
}
fmt.Fprintln(w, "<a href='/login'>Log in with Google</a>")
}
func loginHandler(w http.ResponseWriter, r *http.Request) {
oauthStateString := uniuri.New()
rawURL := googleOauthConfig.AuthCodeURL(oauthStateString)
parsedURL, err := url.Parse(rawURL)
if err != nil {
log.Printf("error parsing url: %v", err)
w.WriteHeader(http.StatusInternalServerError)
return
}
state := parsedURL.Query().Get("state")
err = StoreInSession("state", state, r, w)
if err != nil {
log.Printf("error storing in session %s\n", err.Error())
w.WriteHeader(http.StatusInternalServerError)
return
}
http.Redirect(w, r, rawURL, http.StatusTemporaryRedirect)
}
func logoutHandler(w http.ResponseWriter, r *http.Request) {
Logout(w, r)
http.Redirect(w, r, "/account", http.StatusTemporaryRedirect)
}
func callbackHandler(w http.ResponseWriter, r *http.Request) {
state := r.FormValue("state")
if state == "" {
fmt.Fprintf(w, "Empty state received")
return
}
savedState, _ := GetFromSession("state", r)
if savedState == "" {
fmt.Fprintf(w, "No state in session")
return
}
if state != savedState {
fmt.Fprintf(w, "Invalid state")
return
}
code := r.FormValue("code")
token, err := googleOauthConfig.Exchange(oauth2.NoContext, code)
if err != nil {
fmt.Fprintf(w, "Code exchange failed with error %s\n", err.Error())
return
}
if !token.Valid() {
fmt.Fprintln(w, "Retreived invalid token")
return
}
client := &http.Client{
Timeout: 5 * time.Second,
}
response, err := client.Get("https://www.googleapis.com/oauth2/v2/userinfo?access_token=" + token.AccessToken)
if err != nil {
log.Printf("Error getting user from token %s\n", err.Error())
}
defer response.Body.Close()
contents, err := ioutil.ReadAll(response.Body)
var user *GoogleUser
err = json.Unmarshal(contents, &user)
if err != nil {
log.Printf("Error unmarshaling Google user %s\n", err.Error())
return
}
err = StoreInSession("user", string(contents), r, w)
if err != nil {
log.Printf("Error storing in session %s\n", err.Error())
return
}
http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
}
// StoreInSession stores a specified key/value pair in the session.
func StoreInSession(key string, value string, req *http.Request, res http.ResponseWriter) error {
session, _ := Store.New(req, SessionName)
if err := updateSessionValue(session, key, value); err != nil {
return err
}
return session.Save(req, res)
}
// GetFromSession retrieves a previously-stored value from the session.
// If no value has previously been stored at the specified key, it will return an error.
func GetFromSession(key string, req *http.Request) (string, error) {
session, _ := Store.Get(req, SessionName)
value, err := getSessionValue(session, key)
if err != nil {
return "", errors.New("could not find a matching session for this request")
}
return value, nil
}
func getSessionValue(session *sessions.Session, key string) (string, error) {
value := session.Values[key]
if value == nil {
return "", fmt.Errorf("could not find a matching session for this request")
}
rdata := strings.NewReader(value.(string))
r, err := gzip.NewReader(rdata)
if err != nil {
return "", err
}
s, err := ioutil.ReadAll(r)
if err != nil {
return "", err
}
return string(s), nil
}
func updateSessionValue(session *sessions.Session, key, value string) error {
var b bytes.Buffer
gz := gzip.NewWriter(&b)
if _, err := gz.Write([]byte(value)); err != nil {
return err
}
if err := gz.Flush(); err != nil {
return err
}
if err := gz.Close(); err != nil {
return err
}
session.Values[key] = b.String()
return nil
}
// Logout invalidates a user session.
func Logout(res http.ResponseWriter, req *http.Request) error {
session, err := Store.Get(req, SessionName)
if err != nil {
return err
}
session.Options.MaxAge = -1
session.Values = make(map[interface{}]interface{})
err = session.Save(req, res)
if err != nil {
return errors.New("Could not delete user session")
}
return nil
}