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/** \file
* \brief Main file handling wrappers
*
* \author Copyright (C) 2019 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/>.
//
/**
* \defgroup wrappers JavaScript Shield
*
* \brief Wrappers are small pieces of code that modifies the original functionalty of a function,
* or property defined by standards.
*
* $(PROJECT_NAME) defines wrappers to modify the behaviour of the JavaScript environment. The
* purpose of the most of the wrappers can be divided into several categories:
*
* * Block APIs: some APIs are not generally needed and can be blocked for most of the pages.
* * Precision reduction: The returned value is too precise which might result into attacks on the
* browser or can be used to fingerprint users.
* * Hide information: Some APIs provide information that is not generally needed and can be hidden
* from most of the pages.
* * Provide fake information: We provide fake information mostly to confuse fingerprinters.
*/
/**
* The object carrying all the wrappers
*/
var build_wrapping_code = {};
/**
* Adds a list of wrapping objects to the build_wrapping_code.
*
* This function is called from each wrapper in its file.
*/
function add_wrappers(wrappers) {
for (wrapper of wrappers) {
build_wrapping_code[wrapper.parent_object + "." + wrapper.parent_object_property] = wrapper;
}
}
/**
* Function to be used by wrapped code used for rounding
*/
var rounding_function = `function rounding_function(numberToRound, precision) {
return numberToRound - (numberToRound % precision);
}`;
/**
* Function to be used by wrapped code for adding randomized noise
*/
var noise_function = `let lastValue = 0;
function noise_function(numberToChange, precision) {
const noise = Math.floor(Math.random() * precision);
var value = numberToChange + noise;
if (lastValue < value) {
lastValue = value;
}
return lastValue;
}`;
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