Watermark of the downloaded version of shared PDF files

Achille_L · September 23, 2018, 1:43pm

Dear Forum Subscribers,

I have read nextcloud documentation and I gave a quick look to nextcloud apps, but I haven’t found a reference to how apply a custom “watermark” (background image, for example, with user name of the downloader and timestamp of downloading) to the downloaded version of a file shared by nextcloud (leaving unmodified the original version of downloaded file to let it available to other users for download).

Is it possible with current features with nextcloud ? Otherwise, there is a workaround to achieve these feature ?

Thanks in advances.

bomo · January 3, 2019, 3:41pm

Im not a expert, but I guess you would have to hook into

github.com

nextcloud/server/blob/f77e519137d8b934ce599548a0ce3bdd81b826a2/core/js/sharedialoglinkshareview.js

/*
 * Copyright (c) 2015
 *
 * This file is licensed under the Affero General Public License version 3
 * or later.
 *
 * See the COPYING-README file.
 *
 */

/* globals Clipboard, Handlebars */

(function() {
	if (!OC.Share) {
		OC.Share = {};
	}

	var PASSWORD_PLACEHOLDER = '**********';
	var PASSWORD_PLACEHOLDER_MESSAGE = t('core', 'Choose a password for the public link');
	var PASSWORD_PLACEHOLDER_MESSAGE_OPTIONAL = t('core', 'Choose a password for the public link or press the "Enter" key');

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to add an option to enable the watermark on download.
Add e.g. use

to add a watermark.

Then you would have to hook into the download JS code to execture the above watermark-code.