/
oauth.go
239 lines (198 loc) · 5.23 KB
/
oauth.go
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// Package oauth provides an HTTP handler to handle OAuth2
// redirect and callback requests for the bebop web app.
package oauth
import (
"context"
"fmt"
"log"
"net/http"
"runtime"
"strings"
"time"
"github.com/go-chi/chi"
"github.com/satori/go.uuid"
"golang.org/x/oauth2"
"github.com/JinAirsOs/sc2lover/jwt"
"github.com/JinAirsOs/sc2lover/store"
)
const (
stateCookie = "bebop_oauth_state"
resultCookie = "bebop_oauth_result"
clientTimeout = 10 * time.Second
)
// Config is a configuration of an OAuth handler.
type Config struct {
Logger *log.Logger
UserStore store.UserStore
JWTService jwt.Service
MountURL string
CookiePath string
}
// Handler handles oauth2 authentication requests.
type Handler struct {
*Config
providers map[string]*provider
router chi.Router
}
// New creates a new handler based on the given config.
func New(config *Config) *Handler {
h := &Handler{Config: config}
h.providers = make(map[string]*provider)
h.router = chi.NewRouter()
h.router.Get("/begin/{provider}", h.handleBegin)
h.router.Get("/end/{provider}", h.handleEnd)
return h
}
// AddProvider adds a new provider to oauth handler.
func (h *Handler) AddProvider(name, id, secret string) error {
pc, ok := providerConfigs[name]
if !ok {
return fmt.Errorf("oauth: unknown provider: %q", name)
}
if id == "" {
return fmt.Errorf("oauth: empty client id of provider %q", name)
}
if secret == "" {
return fmt.Errorf("oauth: empty client secret of provider %q", name)
}
if h.providers == nil {
h.providers = make(map[string]*provider)
}
h.providers[name] = &provider{
config: &oauth2.Config{
ClientID: id,
ClientSecret: secret,
RedirectURL: h.MountURL + "/end/" + name,
Endpoint: pc.endpoint,
Scopes: pc.scopes,
},
getUser: pc.getUser,
}
return nil
}
func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
h.router.ServeHTTP(w, r)
}
func (h *Handler) handleBegin(w http.ResponseWriter, r *http.Request) {
providerName := chi.URLParam(r, "provider")
provider, ok := h.providers[providerName]
if !ok {
http.NotFound(w, r)
return
}
state := h.genState()
redirectURL := provider.config.AuthCodeURL(state)
http.SetCookie(w, &http.Cookie{
Name: stateCookie,
Value: state,
Path: h.CookiePath,
HttpOnly: true,
Secure: strings.HasPrefix(h.MountURL, "https"),
MaxAge: 1 * 60 * 60,
})
http.Redirect(w, r, redirectURL, http.StatusFound)
}
func (h *Handler) handleEnd(w http.ResponseWriter, r *http.Request) {
providerName := chi.URLParam(r, "provider")
provider, ok := h.providers[providerName]
if !ok {
http.NotFound(w, r)
return
}
cookie, err := r.Cookie(stateCookie)
if err != nil {
h.handleError(w, "failed to get oauth state cookie: %s", err)
return
}
http.SetCookie(w, &http.Cookie{
Name: stateCookie,
Value: "",
Path: h.CookiePath,
HttpOnly: true,
MaxAge: -1,
})
state := cookie.Value
if state == "" {
h.handleError(w, "empty oauth state cookie")
return
}
queryState := r.URL.Query().Get("state")
if queryState != state {
h.handleError(w, "bad state value")
return
}
queryCode := r.URL.Query().Get("code")
if queryCode == "" {
h.handleError(w, "empty code value")
return
}
ctx, cancel := context.WithTimeout(r.Context(), clientTimeout)
defer cancel()
token, err := provider.config.Exchange(ctx, queryCode)
if err != nil {
h.handleError(w, "exchange failed: %s", err)
return
}
if !token.Valid() {
h.handleError(w, "invalid token")
return
}
u, err := provider.getUser(provider.config.Client(ctx, token))
if err != nil {
h.handleError(w, "get provider user: %s", err)
return
}
if u.id == "" {
h.handleError(w, "provider user id is empty")
return
}
var authToken string
user, err := h.UserStore.GetByAuth(providerName, u.id)
switch err {
case nil:
if user.Blocked {
h.renderOAuthResult(w, "error:UserBlocked")
return
}
authToken, err = h.JWTService.Create(user.ID)
if err != nil {
h.handleError(w, "failed to create auth token: %s", err)
return
}
case store.ErrNotFound:
userID, err := h.UserStore.New(providerName, u.id)
if err != nil {
h.handleError(w, "failed to create user: %s", err)
return
}
authToken, err = h.JWTService.Create(userID)
if err != nil {
h.handleError(w, "failed to create auth token: %s", err)
return
}
default:
h.handleError(w, "failed to get user by auth: %s", err)
return
}
h.renderOAuthResult(w, "success:"+authToken)
}
func (h *Handler) renderOAuthResult(w http.ResponseWriter, message string) {
http.SetCookie(w, &http.Cookie{
Name: resultCookie,
Value: message,
Path: h.CookiePath,
Secure: strings.HasPrefix(h.MountURL, "https"),
MaxAge: 10 * 60,
})
fmt.Fprint(w, `<!doctype html><title>OAuth</title><script>try {opener.bebopOAuthEnd()} finally {window.close()}</script>`)
}
func (h *Handler) handleError(w http.ResponseWriter, format string, a ...interface{}) {
pc, _, _, _ := runtime.Caller(1)
callerNameSplit := strings.Split(runtime.FuncForPC(pc).Name(), ".")
funcName := callerNameSplit[len(callerNameSplit)-1]
h.Logger.Printf("ERROR: %s: %s", funcName, fmt.Sprintf(format, a...))
h.renderOAuthResult(w, "error:Other")
}
func (h *Handler) genState() string {
return uuid.NewV4().String()
}