Move internal packages to an internal folder

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

ui/login_check.go

@@ -1,67 +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/config"
-	"miniflux.app/v2/http/cookie"
-	"miniflux.app/v2/http/request"
-	"miniflux.app/v2/http/response/html"
-	"miniflux.app/v2/http/route"
-	"miniflux.app/v2/logger"
-	"miniflux.app/v2/ui/form"
-	"miniflux.app/v2/ui/session"
-	"miniflux.app/v2/ui/view"
-)
-
-func (h *handler) checkLogin(w http.ResponseWriter, r *http.Request) {
-	clientIP := request.ClientIP(r)
-	sess := session.New(h.store, request.SessionID(r))
-	authForm := form.NewAuthForm(r)
-
-	view := view.New(h.tpl, r, sess)
-	view.Set("errorMessage", "error.bad_credentials")
-	view.Set("form", authForm)
-
-	if err := authForm.Validate(); err != nil {
-		logger.Error("[UI:CheckLogin] %v", err)
-		html.OK(w, r, view.Render("login"))
-		return
-	}
-
-	if err := h.store.CheckPassword(authForm.Username, authForm.Password); err != nil {
-		logger.Error("[UI:CheckLogin] [ClientIP=%s] %v", clientIP, err)
-		html.OK(w, r, view.Render("login"))
-		return
-	}
-
-	sessionToken, userID, err := h.store.CreateUserSessionFromUsername(authForm.Username, r.UserAgent(), clientIP)
-	if err != nil {
-		html.ServerError(w, r, err)
-		return
-	}
-
-	logger.Info("[UI:CheckLogin] username=%s just logged in", authForm.Username)
-	h.store.SetLastLogin(userID)
-
-	user, err := h.store.UserByID(userID)
-	if err != nil {
-		html.ServerError(w, r, err)
-		return
-	}
-
-	sess.SetLanguage(user.Language)
-	sess.SetTheme(user.Theme)
-
-	http.SetCookie(w, cookie.New(
-		cookie.CookieUserSessionID,
-		sessionToken,
-		config.Opts.HTTPS,
-		config.Opts.BasePath(),
-	))
-
-	html.Redirect(w, r, route.Path(h.router, user.DefaultHomePage))
-}