Move internal packages to an internal folder

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

internal/ui/user_update.go

@@ -0,0 +1,74 @@
+// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package ui // import "miniflux.app/v2/internal/ui"
+
+import (
+	"net/http"
+
+	"miniflux.app/v2/internal/http/request"
+	"miniflux.app/v2/internal/http/response/html"
+	"miniflux.app/v2/internal/http/route"
+	"miniflux.app/v2/internal/logger"
+	"miniflux.app/v2/internal/ui/form"
+	"miniflux.app/v2/internal/ui/session"
+	"miniflux.app/v2/internal/ui/view"
+)
+
+func (h *handler) updateUser(w http.ResponseWriter, r *http.Request) {
+	loggedUser, err := h.store.UserByID(request.UserID(r))
+	if err != nil {
+		html.ServerError(w, r, err)
+		return
+	}
+
+	if !loggedUser.IsAdmin {
+		html.Forbidden(w, r)
+		return
+	}
+
+	userID := request.RouteInt64Param(r, "userID")
+	selectedUser, err := h.store.UserByID(userID)
+	if err != nil {
+		html.ServerError(w, r, err)
+		return
+	}
+
+	if selectedUser == nil {
+		html.NotFound(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", loggedUser)
+	view.Set("countUnread", h.store.CountUnreadEntries(loggedUser.ID))
+	view.Set("countErrorFeeds", h.store.CountUserFeedsWithErrors(loggedUser.ID))
+	view.Set("selected_user", selectedUser)
+	view.Set("form", userForm)
+
+	if err := userForm.ValidateModification(); err != nil {
+		view.Set("errorMessage", err.Error())
+		html.OK(w, r, view.Render("edit_user"))
+		return
+	}
+
+	if h.store.AnotherUserExists(selectedUser.ID, userForm.Username) {
+		view.Set("errorMessage", "error.user_already_exists")
+		html.OK(w, r, view.Render("edit_user"))
+		return
+	}
+
+	userForm.Merge(selectedUser)
+	if err := h.store.UpdateUser(selectedUser); err != nil {
+		logger.Error("[UI:UpdateUser] %v", err)
+		view.Set("errorMessage", "error.unable_to_update_user")
+		html.OK(w, r, view.Render("edit_user"))
+		return
+	}
+
+	html.Redirect(w, r, route.Path(h.router, "users"))
+}