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FileCR Assistant Bypass & Helper

extracts software download links (including 'fast download' URLs) and provides access to premium contents.
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// ==UserScript==
// @name               FileCR Assistant Bypass & Helper
// @name:zh-CN         FileCR 助手
// @name:zh-TW         FileCR 助手
// @namespace          xiakele
// @version            2.2

// @description        extracts software download links (including 'fast download' URLs) and provides access to premium contents.
// @description:zh-CN  一键获取FileCR的软件下载链接（包括快速下载），无需拓展即可访问premium内容。
// @description:zh-TW  一鍵取得FileCR的軟體下載連結（包括快速下載），無需拓展即可存取premium內容。
// @author             xiakele
// @license            MIT
// @match              *://filecr.com/*
// @icon               https://filecr.com/favicon.png
// @grant              window.onurlchange
// ==/UserScript==

(function () {
	const versionInfo = {
		id: 'ddgilliopjknmglnpkegbjpoilgachlm',
		version: '9.9.9',
	};

	if (!document.cookie.includes('extensionIsInstalled')) {
		document.cookie = 'extensionIsInstalled=true; expire=Fri, 01 Jan 2077 00:00:00 GMT';
	}

	window.addEventListener(
		'message',
		event => {
			const data = {
				direction: 'from-content-script',
				responseFor: event.data.id,
				type: 'response',
			};
			if (event.data.id === 'install-check') {
				data.data = null;
				window.postMessage(data);
				return;
			}

			switch (event.data.action) {
				case 'app.info': {
					data.data = versionInfo;
					break;
				}

				case 'downloads.extractLink': {
					data.data = event.data.data.url;
					break;
				}

				case 'favorites.has': {
					data.data = false;
					break;
				}

				default: {
					return;
				}
			}

			window.postMessage(data);
		},
	);

	async function getLinks(meta) {
		if (['Torrent', 'Internal'].includes(meta.type)) {
			return fetch(`/api/actions/downloadlink/?id=${meta.id}`)
				.then(data => data.json())
				.then(json => ({provider: meta.type, url: json.url}));
		}

		return fetch(`https://filecr.com/api/actions/worker/?link_id=${meta.id}`)
			.then(data => data.json())
			.then(json => ({provider: json.download_provider, url: json.url}));
	}

	async function displayLinks(json) {
		if (document.querySelector('#link-field')) {
			return;
		}

		const trigger = document.querySelector('#trigger');
		const div = document.createElement('div');
		div.id = 'link-field';
		document.querySelector('.download-info').append(div);
		trigger.innerHTML = 'Loading...';
		const linksMeta = json.props.pageProps.post.downloads[0].links;
		const downloadLinks = await Promise.all(linksMeta.map(meta => getLinks(meta)));
		for (const [i, link] of downloadLinks.entries()) {
			const a = document.createElement('a');
			a.href = link.url;
			a.classList.add('link-light');
			a.innerHTML = `Link ${i + 1} (${link.provider})\n`;
			div.append(a);
		}

		trigger.innerHTML = 'COMPLETE!';
	}

	let reloaded = false;
	function addTrigger() {
		if (document.querySelector('.e-404') && !reloaded) {
			reloaded = true;
			window.location.reload();
		}

		if (!document.querySelector('.download-info') || document.querySelector('#trigger')) {
			return;
		}

		const rawJSON = JSON.parse(document.querySelector('#__NEXT_DATA__').textContent);
		const a = document.createElement('a');
		a.id = 'trigger';
		a.innerHTML = 'GET DOWNLOAD LINKS';
		a.classList.add('link-light');
		if (window.location.pathname.includes(rawJSON.query.postSlug)) {
			a.addEventListener('click', () => displayLinks(rawJSON));
		} else {
			a.addEventListener('click', () => window.location.reload());
			a.innerHTML += '<br>(Data mismatch. Reload is required.)';
		}

		document.querySelector('.download-info').append(a);
	}

	addTrigger();
	if (window.onurlchange === null) {
		window.addEventListener('urlchange', () => addTrigger());
	} else {
		const observer = new MutationObserver(() => addTrigger());
		observer.observe(document.head, {childList: true});
	}
})();
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