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/*******************************************************************************
uBlock Origin - a comprehensive, efficient content blocker
Copyright (C) 2015-present 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/uBlock
*/
/******************************************************************************/
// Scriptlets to count the number of script tags in a document.
(( ) => {
if ( typeof vAPI !== 'object' ) { return; }
const t0 = Date.now();
if ( vAPI.domSurveyScripts instanceof Object === false ) {
vAPI.domSurveyScripts = {
busy: false,
scriptCount: -1,
surveyTime: t0,
};
}
const surveyResults = vAPI.domSurveyScripts;
if ( surveyResults.busy ) { return; }
surveyResults.busy = true;
if ( surveyResults.surveyTime < vAPI.domMutationTime ) {
surveyResults.scriptCount = -1;
}
surveyResults.surveyTime = t0;
if ( surveyResults.scriptCount === -1 ) {
const reInlineScript = /^(data:|blob:|$)/;
let inlineScriptCount = 0;
let scriptCount = 0;
for ( const script of document.scripts ) {
if ( reInlineScript.test(script.src) ) {
inlineScriptCount = 1;
continue;
}
scriptCount += 1;
if ( scriptCount === 99 ) { break; }
}
scriptCount += inlineScriptCount;
if ( scriptCount !== 0 ) {
surveyResults.scriptCount = scriptCount;
}
}
// https://github.com/uBlockOrigin/uBlock-issues/issues/756
// Keep trying to find inline script-like instances but only if we
// have the time-budget to do so.
if ( surveyResults.scriptCount === -1 ) {
if ( document.querySelector('a[href^="javascript:"]') !== null ) {
surveyResults.scriptCount = 1;
}
}
// https://github.com/uBlockOrigin/uBlock-issues/issues/1756
// Mind that there might be no body element.
if ( surveyResults.scriptCount === -1 && document.body !== null ) {
surveyResults.scriptCount = 0;
const onHandlers = new Set([
'onabort', 'onblur', 'oncancel', 'oncanplay',
'oncanplaythrough', 'onchange', 'onclick', 'onclose',
'oncontextmenu', 'oncuechange', 'ondblclick', 'ondrag',
'ondragend', 'ondragenter', 'ondragexit', 'ondragleave',
'ondragover', 'ondragstart', 'ondrop', 'ondurationchange',
'onemptied', 'onended', 'onerror', 'onfocus',
'oninput', 'oninvalid', 'onkeydown', 'onkeypress',
'onkeyup', 'onload', 'onloadeddata', 'onloadedmetadata',
'onloadstart', 'onmousedown', 'onmouseenter', 'onmouseleave',
'onmousemove', 'onmouseout', 'onmouseover', 'onmouseup',
'onwheel', 'onpause', 'onplay', 'onplaying',
'onprogress', 'onratechange', 'onreset', 'onresize',
'onscroll', 'onseeked', 'onseeking', 'onselect',
'onshow', 'onstalled', 'onsubmit', 'onsuspend',
'ontimeupdate', 'ontoggle', 'onvolumechange', 'onwaiting',
'onafterprint', 'onbeforeprint', 'onbeforeunload', 'onhashchange',
'onlanguagechange', 'onmessage', 'onoffline', 'ononline',
'onpagehide', 'onpageshow', 'onrejectionhandled', 'onpopstate',
'onstorage', 'onunhandledrejection', 'onunload',
'oncopy', 'oncut', 'onpaste'
]);
const nodeIter = document.createNodeIterator(
document.body,
NodeFilter.SHOW_ELEMENT
);
for (;;) {
const node = nodeIter.nextNode();
if ( node === null ) { break; }
if ( node.hasAttributes() === false ) { continue; }
for ( const attr of node.getAttributeNames() ) {
if ( onHandlers.has(attr) === false ) { continue; }
surveyResults.scriptCount = 1;
break;
}
}
}
surveyResults.busy = false;
// IMPORTANT: This is returned to the injector, so this MUST be
// the last statement.
if ( surveyResults.scriptCount !== -1 ) {
return surveyResults.scriptCount;
}
})();
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