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-/** \file
- * \brief This file contains wrappers for HTML Audio and Video elements
- *
- * \see https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/canPlayType
- *
- * \author Copyright (C) 2022 Libor Polcak
- *
- * \license SPDX-License-Identifier: GPL-3.0-or-later
- */
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program. If not, see <https://www.gnu.org/licenses/>.
-//
-
-/** \file
- * \ingroup wrappers
- *
- * Supported codecs (multimedia media types) can be misued for fingerprinting,
- * see for example the [FPMon paper](https://fpmon.github.io/fingerprinting-monitor/files/FPMON.pdf).
- *
- * JShelter provides two modes of protection:
- *
- * 1. Strict approach returns all media types as not supported.
- * 2. Modifies the output of probably/maybe supported codecs.
- */
-
-/*
- * Create private namespace
- */
-(function() {
- var wrappers = [
- {
- parent_object: "HTMLMediaElement.prototype",
- parent_object_property: "canPlayType",
- wrapped_objects: [{
- original_name: "HTMLMediaElement.prototype.canPlayType",
- wrapped_name: "origF",
- }],
- helping_code: `var approach = args[0];`,
- wrapping_function_args: "media, ...args",
- wrapping_function_body: `
- if ((approach == 2) || (approach == 1)) {
- return "";
- }
- else {
- var normalized = media.replace(/\s|\\n|\\t|\\r/g, '');
- var origVal = origF.call(this, media);
- if (origVal === "") {
- return origVal;
- }
- else {
- var medcap_prng = alea(domainHash, "MediaCapabilities.prototype.encodingInfo", normalized);
- var rnd = medcap_prng.get_bits(1);
- if (rnd == 0) {
- return "probably";
- }
- else {
- return "maybe";
- }
- }
- }
- `,
- },
- ]
- add_wrappers(wrappers);
-})()