appview/oauth: remove `AuthReturnInfo`

Signed-off-by: Seongmin Lee <[e-mail]>

appview/oauth/accounts.go

···
 	}
 }
 
-type AuthReturnInfo struct {
-	ReturnURL string
-}
-
 func (o *OAuth) SetAuthReturn(w http.ResponseWriter, r *http.Request, returnURL string) error {
 	session, err := o.SessStore.Get(r, AuthReturnName)
 	if err != nil {
···
 	return session.Save(r, w)
 }
 
-func (o *OAuth) GetAuthReturn(r *http.Request) *AuthReturnInfo {
+func (o *OAuth) GetAuthReturn(r *http.Request) string {
 	session, err := o.SessStore.Get(r, AuthReturnName)
 	if err != nil || session.IsNew {
-		return &AuthReturnInfo{}
+		return ""
 	}
 
 	returnURL, _ := session.Values[AuthReturnURL].(string)
 
-	return &AuthReturnInfo{
-		ReturnURL: returnURL,
-	}
+	return returnURL
 }
 
 func (o *OAuth) ClearAuthReturn(w http.ResponseWriter, r *http.Request) error {

appview/oauth/handler.go

···
 	ctx := r.Context()
 	l := o.Logger.With("query", r.URL.Query())
 
-	authReturn := o.GetAuthReturn(r)
+	redirectURL := o.GetAuthReturn(r)
 	_ = o.ClearAuthReturn(w, r)
 
 	sessData, err := o.ClientApp.ProcessCallback(ctx, r.URL.Query())
···
 		}
 	}
 
-	redirectURL := "/"
-	if authReturn.ReturnURL != "" {
-		redirectURL = authReturn.ReturnURL
+	if redirectURL == "" {
+		redirectURL = "/"
 	}
 
 	if o.isAccountDeactivated(sessData) {