Move internal packages to an internal folder

For reference: https://go.dev/doc/go1.4#internalpackages

ui/user_save.go

@@ -1,74 +0,0 @@
-// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
-// SPDX-License-Identifier: Apache-2.0
-
-package ui // import "miniflux.app/v2/ui"
-
-import (
-	"net/http"
-
-	"miniflux.app/v2/http/request"
-	"miniflux.app/v2/http/response/html"
-	"miniflux.app/v2/http/route"
-	"miniflux.app/v2/logger"
-	"miniflux.app/v2/model"
-	"miniflux.app/v2/ui/form"
-	"miniflux.app/v2/ui/session"
-	"miniflux.app/v2/ui/view"
-	"miniflux.app/v2/validator"
-)
-
-func (h *handler) saveUser(w http.ResponseWriter, r *http.Request) {
-	user, err := h.store.UserByID(request.UserID(r))
-	if err != nil {
-		html.ServerError(w, r, err)
-		return
-	}
-
-	if !user.IsAdmin {
-		html.Forbidden(w, r)
-		return
-	}
-
-	userForm := form.NewUserForm(r)
-
-	sess := session.New(h.store, request.SessionID(r))
-	view := view.New(h.tpl, r, sess)
-	view.Set("menu", "settings")
-	view.Set("user", user)
-	view.Set("countUnread", h.store.CountUnreadEntries(user.ID))
-	view.Set("countErrorFeeds", h.store.CountUserFeedsWithErrors(user.ID))
-	view.Set("form", userForm)
-
-	if err := userForm.ValidateCreation(); err != nil {
-		view.Set("errorMessage", err.Error())
-		html.OK(w, r, view.Render("create_user"))
-		return
-	}
-
-	if h.store.UserExists(userForm.Username) {
-		view.Set("errorMessage", "error.user_already_exists")
-		html.OK(w, r, view.Render("create_user"))
-		return
-	}
-
-	userCreationRequest := &model.UserCreationRequest{
-		Username: userForm.Username,
-		Password: userForm.Password,
-		IsAdmin:  userForm.IsAdmin,
-	}
-
-	if validationErr := validator.ValidateUserCreationWithPassword(h.store, userCreationRequest); validationErr != nil {
-		view.Set("errorMessage", validationErr.TranslationKey)
-		html.OK(w, r, view.Render("create_user"))
-		return
-	}
-
-	if _, err := h.store.CreateUser(userCreationRequest); err != nil {
-		logger.Error("[UI:SaveUser] %v", err)
-		view.Set("errorMessage", "error.unable_to_create_user")
-		html.OK(w, r, view.Render("create_user"))
-		return
-	}
-
-	html.Redirect(w, r, route.Path(h.router, "users"))
-}