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/*******************************************************************************
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
*/
/******************************************************************************/
µMatrix.userAgentSpoofer = (function() {
/******************************************************************************/
var userAgentRandomPicker = function() {
var µm = µMatrix;
var userAgents = µm.userSettings.spoofUserAgentWith.split(/[\n\r]+/);
var i, s, pos;
while ( userAgents.length ) {
i = Math.floor(userAgents.length * Math.random());
s = userAgents[i];
if ( s.charAt(0) === '#' ) {
s = '';
} else {
s = s.trim();
}
if ( s !== '' ) {
return s;
}
userAgents.splice(i, 1);
}
return '';
};
/******************************************************************************/
var userAgentSpoofer = function(force) {
var µm = µMatrix;
var uaStr = µm.userAgentReplaceStr;
var obsolete = Date.now();
if ( !force ) {
obsolete -= µm.userSettings.spoofUserAgentEvery * 60 * 1000;
}
if ( µm.userAgentReplaceStrBirth < obsolete ) {
uaStr = '';
}
if ( uaStr === '' ) {
µm.userAgentReplaceStr = userAgentRandomPicker();
µm.userAgentReplaceStrBirth = Date.now();
}
};
// Prime spoofer
userAgentSpoofer();
/******************************************************************************/
µMatrix.asyncJobs.add('userAgentSwitcher', null, userAgentSpoofer, 120 * 1000, true);
/******************************************************************************/
return {
shuffle: function() {
userAgentSpoofer(true);
}
};
})();
/******************************************************************************/