User:SD0001/userscript-load-caching.js

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Documentation for this user script can be added at User:SD0001/userscript-load-caching.

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// Enable caching for resource loads, see [[User:SD0001/Making_user_scripts_load_faster]], @revision 8
if (!/\bnocache=\b/.test(location.href)) { // Don't enable if nocache=1 url parameter is given
	let config = mw.config.values;
	let ctypeJs = 'text/javascript';
	let ctypeCss = 'text/css';
	let loadResource = (page, sitename, ctype) => {
		page = page.replace(/special:mypage/i, 'User:' + config.wgUserName);
		return $.get(
			'https://' + sitename + '/w/api.php?titles=' + page + // page is already URL-encoded
			'&origin=*&format=json&formatversion=2&uselang=content&maxage=86400&smaxage=86400' + 
			'&action=query&prop=revisions|info&rvprop=content&rvlimit=1&inprop=protection'
		).then((apiResponse) => {
			let apiPage = apiResponse.query.pages[0];
			if (!apiPage.missing) {
				if (apiPage.ns !== 2 && apiPage.ns !== 8 && !apiPage.protection.find(p => p.type === 'edit' && p.level === 'sysop')) {
					return $.Deferred().reject('Refused to load "' + page + '"@' + sitename + ': unprotected page');
				}
				let content = apiPage.revisions[0].content;
				if ((!ctype || ctype === ctypeJs) && apiPage.contentmodel === 'javascript') {
					let scriptTag = document.createElement('script');
					scriptTag.innerHTML = content;
					document.head.appendChild(scriptTag);
			    } else if (ctype === ctypeCss && apiPage.contentmodel === 'css') {
					mw.loader.addStyleTag(content);
				} else {
					return $.Deferred().reject('Refused to load "' + page + '"@' + sitename + ': content type mismatch');
				}
			}
		});
	};
	let serverName = config.wgServerName;
	let getSiteTitle = (url) => {
		let siteRgx = /^(?:(?:https:)?\/\/(.*))?\/w\/index.php/.exec(url),
			titleRgx = /\btitle=([^=?&]*)/.exec(url);
		if (siteRgx && titleRgx && /\baction=raw\b/.test(url) && /\bctype=/.test(url)) {
			return [titleRgx[1], siteRgx[1] || serverName];	
		} else return null;
	};
	window.importScript = (page) => {
		loadResource(encodeURIComponent(page), serverName, ctypeJs);
	};
	window.importStyleSheet = (page) => {
		loadResource(encodeURIComponent(page), serverName, ctypeCss);
	};
	let oldMwLoaderLoad = mw.loader.load;
	mw.loader.load = function(url, type) {
		let linkParts = getSiteTitle(url);
		if (linkParts) {
			loadResource(linkParts[0], linkParts[1], type);
		} else {
			oldMwLoaderLoad.apply(mw.loader, [...arguments]);
		}
	};
	let oldMwLoaderGetScript = mw.loader.getScript;
	mw.loader.getScript = function(url) {
		let linkParts = getSiteTitle(url);
		if (linkParts) {
			return loadResource(linkParts[0], linkParts[1], ctypeJs);
		} else {
			return oldMwLoaderGetScript.apply(mw.loader, [...arguments]);
		}
	};
}