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Fine tune script tags survey scriptlet

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Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/756

The code used to count expensive-to-survey particular
inline javascript occurrences will be executed if and
only if no other script tags have been found in the
DOM. This is acceptable since the badge count is to be
deemed approximate (as per documentation).
This commit is contained in:
Raymond Hill 2019-11-01 14:28:15 -04:00
parent 83834f12a1
commit 8acc39581c
No known key found for this signature in database
GPG Key ID: 25E1490B761470C2
1 changed files with 16 additions and 21 deletions
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37
src/js/scriptlets/dom-survey-scripts.js
View File

@ -29,13 +29,11 @@
if ( typeof vAPI !== 'object' ) { return; }
const t0 = Date.now();
const tMax = t0 + 50;
if ( vAPI.domSurveyScripts instanceof Object === false ) {
vAPI.domSurveyScripts = {
busy: false,
inlineScriptCount: -1,
externalScriptCount: -1,
scriptCount: -1,
surveyTime: t0,
};
}
@ -45,40 +43,39 @@
surveyResults.busy = true;
if ( surveyResults.surveyTime < vAPI.domMutationTime ) {
surveyResults.inlineScriptCount = -1;
surveyResults.externalScriptCount = -1;
surveyResults.scriptCount = -1;
}
surveyResults.surveyTime = t0;
if ( surveyResults.externalScriptCount === -1 ) {
if ( surveyResults.scriptCount === -1 ) {
const reInlineScript = /^(data:|blob:|$)/;
let inlineScriptCount = 0;
let externalScriptCount = 0;
let scriptCount = 0;
for ( const script of document.scripts ) {
if ( reInlineScript.test(script.src) ) {
inlineScriptCount = 1;
continue;
}
externalScriptCount += 1;
if ( externalScriptCount === 99 ) { break; }
scriptCount += 1;
if ( scriptCount === 99 ) { break; }
}
if ( inlineScriptCount !== 0 || externalScriptCount === 99 ) {
surveyResults.inlineScriptCount = inlineScriptCount;
scriptCount += inlineScriptCount;
if ( scriptCount !== 0 ) {
surveyResults.scriptCount = scriptCount;
}
surveyResults.externalScriptCount = externalScriptCount;
}
// 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.inlineScriptCount === -1 && Date.now() < tMax ) {
if ( surveyResults.scriptCount === -1 ) {
if ( document.querySelector('a[href^="javascript:"]') !== null ) {
surveyResults.inlineScriptCount = 1;
surveyResults.scriptCount = 1;
}
}
if ( surveyResults.inlineScriptCount === -1 && Date.now() < tMax ) {
surveyResults.inlineScriptCount = 0;
if ( surveyResults.scriptCount === -1 ) {
surveyResults.scriptCount = 0;
const onHandlers = new Set([
'onabort', 'onblur', 'oncancel', 'oncanplay',
'oncanplaythrough', 'onchange', 'onclick', 'onclose',
@ -111,7 +108,7 @@
if ( node.hasAttributes() === false ) { continue; }
for ( const attr of node.getAttributeNames() ) {
if ( onHandlers.has(attr) === false ) { continue; }
surveyResults.inlineScriptCount = 1;
surveyResults.scriptCount = 1;
break;
}
}
@ -121,9 +118,7 @@
// IMPORTANT: This is returned to the injector, so this MUST be
// the last statement.
let total = surveyResults.externalScriptCount;
if ( surveyResults.inlineScriptCount !== -1 ) {
total += surveyResults.inlineScriptCount;
if ( surveyResults.scriptCount !== -1 ) {
return surveyResults.scriptCount;
}
return total;
})();