Plugin: OnlyOffice: Add missing files

plugin/onlyoffice/error.php

@@ -0,0 +1,45 @@
+<?php
+/**
+ *
+ * (c) Copyright Ascensio System SIA 2022
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+require_once __DIR__.'/../../main/inc/global.inc.php';
+
+const ErrorStatus_UpdateOnlyoffice = 1;
+const ErrorStatus_NotSupportedVersion = 2;
+
+$plugin = OnlyofficePlugin::create();
+
+$message = "";
+$status = $_GET["status"];
+switch ($status) {
+    case ErrorStatus_UpdateOnlyoffice:
+        $message = "UpdateOnlyoffice";
+        break;
+    case ErrorStatus_NotSupportedVersion:
+        $message = "NotSupportedVersion";
+        break;
+}
+
+Display::addFlash(
+    Display::return_message(
+        $plugin->get_lang($message),
+        "error"
+    )
+);
+
+Display::display_header();

plugin/onlyoffice/layout/get_docs_cloud_banner.tpl

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+<link href="/plugin/onlyoffice/resources/css/docsCloudBanner.css" rel="stylesheet" media="screen" type="text/css"/>
+<div id="onlyofficeDocsCloudBannerWrapper">
+    <div id="onlyofficeDocsCloudBannerPicWrapper">
+        <div id="onlyofficeDocsCloudBannerPic">
+
+        </div>
+    </div>
+    <div id="onlyofficeDocsCloudBannerContent">
+        <div id="onlyofficeDocsCloudBannerContentText">
+            <p><h4>{{banner_title}}</h4></p>
+            <p>{{banner_main_text}}</p>
+        </div>
+        <div id="onlyofficeDocsCloudBannerContentButtonWrapper">
+            <a id="onlyofficeDocsCloudBannerContentButton" class="btn btn-secondary" href="{{docs_cloud_link}}" target="_blank">
+                {{banner_button_text}}
+            </a>
+        </div>
+    </div>
+</div>