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ChiaSeNhac Helper

Download lossless music directly, bypass sharing dialog.

当前为 2019-09-24 提交的版本，查看 最新版本。

// ==UserScript==
// @name         ChiaSeNhac Helper
// @namespace    https://lelinhtinh.github.io
// @description  Download lossless music directly, bypass sharing dialog.
// @version      1.2.0
// @icon         https://i.imgur.com/HLqWP3g.png
// @author       lelinhtinh
// @oujs:author  baivong
// @license      MIT; https://baivong.mit-license.org/license.txt
// @match        https://chiasenhac.vn/*
// @match        https://*.chiasenhac.vn/*
// @require      https://greasemonkey.github.io/gm4-polyfill/gm4-polyfill.js?v=a834d46
// @noframes
// @supportURL   https://github.com/lelinhtinh/Userscript/issues
// @run-at       document-idle
// @grant        GM.xmlHttpRequest
// @grant        GM_xmlhttpRequest
// ==/UserScript==

(function () {
    'use strict';

    const getFileSize = (url, callback) => {
        GM.xmlHttpRequest({
            url: url,
            method: 'HEAD',
            onload: response => {
                let size = response.responseHeaders;

                size = size.match(/^content\-length:\s(\d+)/im);
                if (!size) callback(null);

                size = parseInt(size[1], 10);
                size = (size / 1048576).toFixed(2);
                callback(size);
            }
        });
    };

    const getFlacLink = downloadLink => downloadLink
        .replace(/\/(128|320|m4a|32)\//, '/flac/')
        .replace(/\.(mp3|m4a)$/, '.flac');

    const $downLossLess = document.querySelector('a.download_item[href="javascript:downLossLessMusic();"]');

    if ($downLossLess) {
        $downLossLess.setAttribute('href', getFlacLink(document.querySelector('a.download_item').href));
        $downLossLess.setAttribute('target', '_blank');
    } else {

        const $down500kbps = document.querySelector('a.download_item[href*="/m4a/"]');
        if (!$down500kbps) return;

        const $parent = $down500kbps.parentNode;
        let tempSize = $down500kbps.textContent.trim().match(/([\d.]+)\sMB$/)[1];
        const flacLink = getFlacLink($down500kbps.href);

        tempSize = Number(tempSize) * 2.4;
        tempSize = parseFloat(tempSize).toFixed(2);

        $parent.insertAdjacentHTML('afterEnd', `
            <li>
                <a class="download_item" target="_blank" href="${flacLink}" title="${$down500kbps.title}">
                    <i class="material-icons">file_download</i> Link tải nhạc <span class="c4">FLAC Lossless</span> <span class="fake_size">${tempSize}</span> MB
                </a>
            </li>
        `);

        getFileSize(flacLink, size => {
            if (size) document.querySelector('.download_item .fake_size').textContent = size;
        });

    }

}());