// ==UserScript==
// @name         Edge CRX Downloader
// @license      AGPL-3.0
// @namespace    https://github.com/54145a
// @version      1.1
// @description  Download CRX file from Edge Add-ons
// @author       145a
// @match        https://microsoftedge.microsoft.com/addons/detail/*
// @grant        GM_registerMenuCommand
// @grant        GM_download
// ==/UserScript==

(function() {
    "use strict";

    GM_registerMenuCommand('Download CRX', () => {
        // URL be like: https://microsoftedge.microsoft.com/addons/detail/content-farm-terminator/fgckcfkpckemdnnejbbfkkchanedbeje
        const parts = location.pathname.replace(/\/$/, '').split('/');
        const id = parts.pop();
        const name = parts.pop();

        if (!id || !/^[a-z]{32}$/i.test(id)) {
            alert('Failed to extract extension ID.');
            return;
        }

        const filename = name && /^[\w-]+$/.test(name)
            ? `${name}.crx`
            : `${id}.crx`;

        /** @see https://learn.microsoft.com/zh-cn/answers/questions/2366350/microsoft-edge-crx */
        const url = `https://edge.microsoft.com/extensionwebstorebase/v1/crx?response=redirect&prod=chromiumcrx&prodchannel=&x=id%3D${id}%26installsource%3Dondemand%26uc`;

        GM_download({
            url: url,
            name: filename,
            saveAs: true
        });
    });
})();