uMatrix/src/js/privacy.js

/*******************************************************************************

    µMatrix - a Chromium browser extension to black/white list requests.
    Copyright (C) 2014  Raymond Hill

    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 {http://www.gnu.org/licenses/}.

    Home: https://github.com/gorhill/uMatrix
*/

/* global vAPI, uDom */

/******************************************************************************/

(function() {

'use strict';

/******************************************************************************/

var messager = vAPI.messaging.channel('privacy.js');

var cachedPrivacySettings = {};

/******************************************************************************/

function changeUserSettings(name, value) {
    messager.send({
        what: 'userSettings',
        name: name,
        value: value
    });
}

/******************************************************************************/

function changeMatrixSwitch(name, state) {
    messager.send({
        what: 'setMatrixSwitch',
        switchName: name,
        state: state
    });
}

/******************************************************************************/

function onChangeValueHandler(uelem, setting, min, max) {
    var oldVal = cachedPrivacySettings.userSettings[setting];
    var newVal = Math.round(parseFloat(uelem.val()));
    if ( typeof newVal !== 'number' ) {
        newVal = oldVal;
    } else {
        newVal = Math.max(newVal, min);
        newVal = Math.min(newVal, max);
    }
    uelem.val(newVal);
    if ( newVal !== oldVal ) {
        changeUserSettings(setting, newVal);
    }
}

/******************************************************************************/

function prepareToDie() {
    onChangeValueHandler(uDom('#delete-unused-session-cookies-after'), 'deleteUnusedSessionCookiesAfter', 15, 1440);
    onChangeValueHandler(uDom('#clear-browser-cache-after'), 'clearBrowserCacheAfter', 15, 1440);
    onChangeValueHandler(uDom('#spoof-user-agent-every'), 'spoofUserAgentEvery', 2, 999);
}

/******************************************************************************/

var installEventHandlers = function() {
    uDom('[data-setting-bool]').on('change', function(){
        var settingName = this.getAttribute('data-setting-bool');
        if ( typeof settingName === 'string' && settingName !== '' ) {
            changeUserSettings(settingName, this.checked);
        }
    });

    uDom('[data-matrix-switch]').on('change', function(){
        var switchName = this.getAttribute('data-matrix-switch');
        if ( typeof switchName === 'string' && switchName !== '' ) {
            changeMatrixSwitch(switchName, this.checked);
        }
    });

    uDom('#delete-unused-session-cookies-after').on('change', function(){
        onChangeValueHandler(uDom(this), 'deleteUnusedSessionCookiesAfter', 15, 1440);
    });
    uDom('#clear-browser-cache-after').on('change', function(){
        onChangeValueHandler(uDom(this), 'clearBrowserCacheAfter', 15, 1440);
    });
    uDom('#spoof-user-agent-every').on('change', function(){
        onChangeValueHandler(uDom(this), 'spoofUserAgentEvery', 2, 999);
    });
    uDom('#spoof-user-agent-with').on('change', function(){
        changeUserSettings('spoofUserAgentWith', uDom(this).val());
    });

    // https://github.com/gorhill/httpswitchboard/issues/197
    uDom(window).on('beforeunload', prepareToDie);
};

/******************************************************************************/

uDom.onLoad(function() {
    var onSettingsReceived = function(privacySettings) {
        // Cache copy
        cachedPrivacySettings = privacySettings;

        var userSettings = privacySettings.userSettings;
        var matrixSwitches = privacySettings.matrixSwitches;

        uDom('[data-setting-bool]').forEach(function(elem){
            var settingName = elem.attr('data-setting-bool');
            if ( typeof settingName === 'string' && settingName !== '' ) {
                elem.prop('checked', userSettings[settingName] === true);
            }
        });

        uDom('[data-matrix-switch]').forEach(function(elem){
            var switchName = elem.attr('data-matrix-switch');
            if ( typeof switchName === 'string' && switchName !== '' ) {
                elem.prop('checked', matrixSwitches[switchName] === true);
            }
        });

        uDom('#delete-unused-session-cookies-after').val(userSettings.deleteUnusedSessionCookiesAfter);
        uDom('#clear-browser-cache-after').val(userSettings.clearBrowserCacheAfter);
        uDom('#spoof-user-agent-every').val(userSettings.spoofUserAgentEvery);
        uDom('#spoof-user-agent-with').val(userSettings.spoofUserAgentWith);

        installEventHandlers();
    };
    messager.send({ what: 'getPrivacySettings' }, onSettingsReceived);
});

/******************************************************************************/

})();