PLT-6924 Added ability to disable file uploads/downloads on old mobile apps (#7117)

webapp/components/view_image.jsx

@@ -1,25 +1,26 @@
 // Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
 // See License.txt for license information.
 
-import AudioVideoPreview from './audio_video_preview.jsx';
-import CodePreview from './code_preview.jsx';
-import PDFPreview from './pdf_preview.jsx';
-import FileInfoPreview from './file_info_preview.jsx';
-import ViewImagePopoverBar from './view_image_popover_bar.jsx';
-
-import * as GlobalActions from 'actions/global_actions.jsx';
-
-import * as Utils from 'utils/utils.jsx';
-import {getFileUrl, getFilePreviewUrl} from 'mattermost-redux/utils/file_utils';
-
-import Constants from 'utils/constants.jsx';
-const KeyCodes = Constants.KeyCodes;
-
 import $ from 'jquery';
 import PropTypes from 'prop-types';
 import React from 'react';
 import {Modal} from 'react-bootstrap';
 
+import * as GlobalActions from 'actions/global_actions.jsx';
+
+import * as FileUtils from 'utils/file_utils';
+import * as Utils from 'utils/utils.jsx';
+
+import {KeyCodes} from 'utils/constants.jsx';
+
+import {getFileUrl, getFilePreviewUrl} from 'mattermost-redux/utils/file_utils';
+
+import AudioVideoPreview from './audio_video_preview.jsx';
+import CodePreview from './code_preview.jsx';
+import FileInfoPreview from './file_info_preview.jsx';
+import PDFPreview from './pdf_preview.jsx';
+import ViewImagePopoverBar from './view_image_popover_bar.jsx';
+
 import loadingGif from 'images/load.gif';
 
 export default class ViewImageModal extends React.Component {
@@ -350,6 +351,10 @@ function ImagePreview({fileInfo, fileUrl}) {
         previewUrl = fileUrl;
     }
 
+    if (!FileUtils.canDownloadFiles()) {
+        return <img src={previewUrl}/>;
+    }
+
     return (
         <a
             href={fileUrl}