Fix 'href-sanitizer' — performance issue

[Alex-302]

AdGuard 4.4.41
Scriptlets v1.12.1

Details

https://hentai-id.tv/ uses URL shortener for analytics

Following rule removes redirection
hentai-id.tv#%#//scriptlet('href-sanitizer', 'a[href*="://ouo.io/"]', '?s')

Example

https://ouo.io/s/lbH3iXRW?s=https://hentai-id.tv/my-weekend-sex-buddy-my-female-boss-only-i-know-the-other-side-of-julia/

changed to

https://hentai-id.tv/my-weekend-sex-buddy-my-female-boss-only-i-know-the-other-side-of-julia/

Problem details

I need to wait until the page will be loaded completely.
It can be reproduce with throttling as 3G using the DevTools.

Details

Proposed solution

Probably mutation observer can be used to scan elements, or just scan every 0.5-1 second.

[AdamWr]

If I'm not wrong, it's due to this part:

Scriptlets/src/scriptlets/href-sanitizer.ts

Lines 553 to 555 in 3ba245f

	if (document.readyState === 'loading') {
	window.addEventListener('DOMContentLoaded', run, { once: true });
	} else {

It looks like that DOMContentLoaded is fired late when there is slow connection, maybe we can get rid of it.

Does it happen with the following rule?

hentai-id.tv#%#!function(t,e){var n=t.uniqueId+t.name+"_"+(Array.isArray(e)?e.join("_"):"");if(!t.uniqueId||"done"!==Window.prototype.toString[n]){var o=e?[].concat(t).concat(e):[t];try{(function(t,e){var n=arguments.length>2&&void 0!==arguments[2]?arguments[2]:"text";if(e){var o=/^[^\x21-\x7e\p{Letter}]+/u,c=/[^\x21-\x7e\p{Letter}]+$/u,i=function(e){var i;try{i=document.querySelectorAll(e)}catch(n){return void r(t,'Invalid selector "'.concat(e,'"'))}i.forEach((function(e){try{if("a"!==(l=e).nodeName.toLowerCase()||!l.hasAttribute("href"))return;var i=function(e,n){if("text"===n)return e.textContent?e.textContent.replace(o,"").replace(c,""):"";if(n.startsWith("?"))try{return new URL(e.href,document.location.href).searchParams.get(n.slice(1))||""}catch(o){return r(t,"Cannot retrieve the parameter '".concat(n.slice(1),"' from the URL '").concat(e.href)),""}return n.startsWith("[")&&n.endsWith("]")&&e.getAttribute(n.slice(1,-1))||""}(e,n),a=function(e){if(!e)return null;try{var n=new URL(e,document.location.href),o=n.href,c=n.protocol;return"http:"!==c&&"https:"!==c?(r(t,'Protocol not allowed: "'.concat(c,'", from URL: "').concat(o,'"')),null):o}catch(t){return null}}(i);if(!a)return void r(t,"Invalid URL: ".concat(i));var u=e.href;e.setAttribute("href",a),a!==u&&r(t,'Sanitized "'.concat(u,'" to "').concat(a,'".'))}catch(n){r(t,"Failed to sanitize ".concat(e,"."))}var l})),function(t){if(t.verbose){try{var e=console.trace.bind(console),n="".concat("[AdGuard]"," ");"corelibs"===t.engine?n+=t.ruleText:(t.domainName&&(n+="".concat(t.domainName)),t.args?n+="#%#//scriptlet('".concat(t.name,"', '").concat(t.args.join("', '"),"')"):n+="#%#//scriptlet('".concat(t.name,"')")),e&&e(n)}catch(t){}"function"==typeof window.__debug&&window.__debug(t)}}(t)};i(e),function(t){var e,n,o,r,c=arguments.length>1&&void 0!==arguments[1]&&arguments[1],i=arguments.length>2&&void 0!==arguments[2]?arguments[2]:[],a=new MutationObserver((e=function(){l(),t(),u()},o=!1,r=function t(){for(var r=arguments.length,c=new Array(r),i=0;i<r;i++)c[i]=arguments[i];o?n=c:(e(...c),o=!0,setTimeout((function(){o=!1,n&&(t(...n),n=null)}),20))},r)),u=function(){i.length>0?a.observe(document.documentElement,{childList:!0,subtree:!0,attributes:c,attributeFilter:i}):a.observe(document.documentElement,{childList:!0,subtree:!0,attributes:c})},l=function(){a.disconnect()};u()}((function(){return i(e)}),!0)}else r(t,"Selector is required.")}).apply(this,o),t.uniqueId&&Object.defineProperty(Window.prototype.toString,n,{value:"done",enumerable:!1,writable:!1,configurable:!1})}catch(t){console.log(t)}}function r(t,e){var n=arguments.length>2&&void 0!==arguments[2]&&arguments[2],o=!(arguments.length>3&&void 0!==arguments[3])||arguments[3],r=t.name,c=t.verbose;if(n||c){var i=console.log;o?i("".concat(r,": ").concat(e)):i("".concat(r,":"),e)}}}({name:"href-sanitizer",engine:"corelibs",version:"1.16.48",verbose:!1},['a[href*="://ouo.io/"]',"?s"]);

It's almost the same as scriptlet but with removed mentioned part.

[Alex-302]

@AdamWr Works immediately.