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package exampleop
import (
"context"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"github.com/go-chi/chi/v5"
"github.com/gorilla/securecookie"
"github.com/sirupsen/logrus"
"github.com/zitadel/oidc/v3/pkg/op"
)
type deviceAuthenticate interface {
CheckUsernamePasswordSimple(username, password string) error
op.DeviceAuthorizationStorage
// GetDeviceAuthorizationByUserCode resturns the current state of the device authorization flow,
// identified by the user code.
GetDeviceAuthorizationByUserCode(ctx context.Context, userCode string) (*op.DeviceAuthorizationState, error)
// CompleteDeviceAuthorization marks a device authorization entry as Completed,
// identified by userCode. The Subject is added to the state, so that
// GetDeviceAuthorizatonState can use it to create a new Access Token.
CompleteDeviceAuthorization(ctx context.Context, userCode, subject string) error
// DenyDeviceAuthorization marks a device authorization entry as Denied.
DenyDeviceAuthorization(ctx context.Context, userCode string) error
}
type deviceLogin struct {
storage deviceAuthenticate
cookie *securecookie.SecureCookie
}
func registerDeviceAuth(storage deviceAuthenticate, router chi.Router) {
l := &deviceLogin{
storage: storage,
cookie: securecookie.New(securecookie.GenerateRandomKey(32), nil),
}
router.HandleFunc("/", l.userCodeHandler)
router.Post("/login", l.loginHandler)
router.HandleFunc("/confirm", l.confirmHandler)
}
func renderUserCode(w io.Writer, err error) {
data := struct {
Error string
}{
Error: errMsg(err),
}
if err := templates.ExecuteTemplate(w, "usercode", data); err != nil {
logrus.Error(err)
}
}
func renderDeviceLogin(w http.ResponseWriter, userCode string, err error) {
data := &struct {
UserCode string
Error string
}{
UserCode: userCode,
Error: errMsg(err),
}
if err = templates.ExecuteTemplate(w, "device_login", data); err != nil {
logrus.Error(err)
}
}
func renderConfirmPage(w http.ResponseWriter, username, clientID string, scopes []string) {
data := &struct {
Username string
ClientID string
Scopes []string
}{
Username: username,
ClientID: clientID,
Scopes: scopes,
}
if err := templates.ExecuteTemplate(w, "confirm_device", data); err != nil {
logrus.Error(err)
}
}
func (d *deviceLogin) userCodeHandler(w http.ResponseWriter, r *http.Request) {
err := r.ParseForm()
if err != nil {
w.WriteHeader(http.StatusBadRequest)
renderUserCode(w, err)
return
}
userCode := r.Form.Get("user_code")
if userCode == "" {
if prompt, _ := url.QueryUnescape(r.Form.Get("prompt")); prompt != "" {
err = errors.New(prompt)
}
renderUserCode(w, err)
return
}
renderDeviceLogin(w, userCode, nil)
}
func redirectBack(w http.ResponseWriter, r *http.Request, prompt string) {
values := make(url.Values)
values.Set("prompt", url.QueryEscape(prompt))
url := url.URL{
Path: "/device",
RawQuery: values.Encode(),
}
http.Redirect(w, r, url.String(), http.StatusSeeOther)
}
const userCodeCookieName = "user_code"
type userCodeCookie struct {
UserCode string
UserName string
}
func (d *deviceLogin) loginHandler(w http.ResponseWriter, r *http.Request) {
if err := r.ParseForm(); err != nil {
redirectBack(w, r, err.Error())
return
}
userCode := r.PostForm.Get("user_code")
if userCode == "" {
redirectBack(w, r, "missing user_code in request")
return
}
username := r.PostForm.Get("username")
if username == "" {
redirectBack(w, r, "missing username in request")
return
}
password := r.PostForm.Get("password")
if password == "" {
redirectBack(w, r, "missing password in request")
return
}
if err := d.storage.CheckUsernamePasswordSimple(username, password); err != nil {
redirectBack(w, r, err.Error())
return
}
state, err := d.storage.GetDeviceAuthorizationByUserCode(r.Context(), userCode)
if err != nil {
redirectBack(w, r, err.Error())
return
}
encoded, err := d.cookie.Encode(userCodeCookieName, userCodeCookie{userCode, username})
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
cookie := &http.Cookie{
Name: userCodeCookieName,
Value: encoded,
Path: "/",
}
http.SetCookie(w, cookie)
renderConfirmPage(w, username, state.ClientID, state.Scopes)
}
func (d *deviceLogin) confirmHandler(w http.ResponseWriter, r *http.Request) {
cookie, err := r.Cookie(userCodeCookieName)
if err != nil {
redirectBack(w, r, err.Error())
return
}
data := new(userCodeCookie)
if err = d.cookie.Decode(userCodeCookieName, cookie.Value, &data); err != nil {
redirectBack(w, r, err.Error())
return
}
if err = r.ParseForm(); err != nil {
redirectBack(w, r, err.Error())
return
}
action := r.Form.Get("action")
switch action {
case "allowed":
err = d.storage.CompleteDeviceAuthorization(r.Context(), data.UserCode, data.UserName)
case "denied":
err = d.storage.DenyDeviceAuthorization(r.Context(), data.UserCode)
default:
err = errors.New("action must be one of \"allow\" or \"deny\"")
}
if err != nil {
redirectBack(w, r, err.Error())
return
}
fmt.Fprintf(w, "Device authorization %s. You can now return to the device", action)
}
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