// ==UserScript==
// @name         超星学习通扫码登录
// @namespace    https://github.com/qcxs/chaoxing
// @version      1.0 beta
// @description  让浏览器为其他设备扫码登录，需当前浏览器已登录账号。菜单触发授权，自动补全确认页 URL，也可手动输入其他登录 URL
// @author       青春向上
// @match        *://*.chaoxing.com/*
// @run-at       document-idle
// @grant        GM_xmlhttpRequest
// @grant        GM_registerMenuCommand
// ==/UserScript==

(function () {
    'use strict';

    // 只在顶层页面运行，iframe 不运行，避免重复弹出
    if (window.self !== window.top) {
        return;
    }

    var FAKE_UA = 'Mozilla/5.0 (Linux; Android 11; ABR-AL00 Build/HUAWEIABR-AL00; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/88.0.4324.93 Mobile Safari/537.36 (schild:3b9718671596b4bbca76d8715046a55f) (device:ABR-AL00) Language/zh_CN_#Hans com.chaoxing.mobileinhouse/ChaoXingStudy_3_5.2.4.1_android_phone_893_97 (@Azeroth)_f7a007ab1d9e48b2aca72d8ae08c9388';

    var MAX_RETRIES = 3;
    var RETRY_DELAY = 1000;

    function doAuth(uuid, enc) {
        var attemptCount = 0;

        function send() {
            attemptCount++;
            GM_xmlhttpRequest({
                method: 'POST',
                url: 'https://passport2.chaoxing.com/authlogin',
                headers: {
                    'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8',
                    'User-Agent': FAKE_UA,
                    'X-Requested-With': 'XMLHttpRequest'
                },
                data: 'enc=' + encodeURIComponent(enc) + '&uuid=' + encodeURIComponent(uuid),
                withCredentials: true,
                onload: function (resp) {
                    try {
                        var json = JSON.parse(resp.responseText);
                        if (json.status === true) {
                            return;
                        }
                    } catch (e) {}
                    retry();
                },
                onerror: function () {
                    retry();
                },
                ontimeout: function () {
                    retry();
                }
            });
        }

        function retry() {
            if (attemptCount < MAX_RETRIES) {
                setTimeout(send, RETRY_DELAY);
            }
        }

        send();
        alert('已尝试进行登录，若未成功，请检查网络连接、当前浏览器是否已登录账号。');
    }

    function startAuthFromUrl(authUrl) {
        try {
            var urlObj = new URL(authUrl);
            var params = urlObj.searchParams;
            var uuid = params.get('uuid');
            var enc = params.get('enc');
            if (uuid && enc) {
                doAuth(uuid, enc);
            }
        } catch (e) {}
    }

    GM_registerMenuCommand('学习通扫码授权', function () {
        var currentUrl = window.location.href;
        var defaultUrl = '';

        if (currentUrl.indexOf('/toauthlogin') !== -1) {
            defaultUrl = currentUrl;
        }

        var input = prompt('请输入登录确认 URL：', defaultUrl);
        if (input && input.trim()) {
            startAuthFromUrl(input.trim());
        }
    });

})();