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vncntd / AutoLogin

// ==UserScript==
// @name         AutoLogin
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Auto login after session expired
// @license MIT
// @author       Yuhui
// @match        https://auth.nfjd.gmcc.net/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    var DefaultTimeout = 5;// by seconds
    var autologin_in_action = false;
    var page_type = getPageType();

    if (page_type == 'welcome') {
        var form = document.querySelector('form[name="frmLogin"]');
        var username = document.querySelector('input[name="username"]');
        var password = document.querySelector('input[name="password"]');
        var ptr = password.parentNode.parentNode;
        var tbody = ptr.parentNode;

        showAutoLogin();
        trigger(isAutoLoginEnabled());

        function login() {
            if (!!username.value && !!password.value) {
                console.log('tring to auto login at ' + new Date().toTimeString());
                form.submit();
            } else {
                alert('用户名或密码为空，自动登录脚本不保存用户名密码，请开启浏览器自带的自动补全功能');
            }
        }

        function trigger(enabled) {
            autologin_in_action = enabled;
            if (enabled) {
                startCount(DefaultTimeout);
            }
        }

        function startCount(timeout) {
            var label = document.getElementById('notify_msg');
            var msg = timeout + ' 秒后自动登录';
            if (!autologin_in_action) {
                label.innerHTML = '';
            } else {
                label.innerHTML = msg;
                if (timeout <= 0) {
                    autologin_in_action = false;
                    login();
                    label.innerHTML = '';
                } else {
                    setTimeout(startCount.bind(null,timeout - 1),1000);
                }
            }
        }

        function showAutoLogin() {
            var tr = document.createElement("tr");
            tr.insertCell(-1).innerHTML = "自动登录";
            tr.insertCell(-1).innerHTML = " ";
            tr.insertCell(-1).appendChild(createCheckbox(trigger));
            tr.insertCell(-1).innerHTML = "<label id=notify_msg></label>"
            tbody.insertBefore(tr,ptr.nextSibling);
        }

    } else if (page_type == 'infranet') {
        var clock = document.getElementById('liveclock2');
        var tr = clock.parentNode.parentNode;
        tr.insertCell(0).appendChild(createCheckbox());
        tr.insertCell(0).innerHTML = "自动登录";
    }

    function getPageType() {
        var href = location.href;
        if (href.indexOf('welcome.cgi') != -1) {
            if (href.indexOf('session-limit') == -1) {
                return 'welcome';
            }
        } else if (href.indexOf('infranet.cgi') != -1) {
            return 'infranet';
        }

        return 'ignore';
    }

    function isAutoLoginEnabled() {
        if (localStorage.getItem("autologin") == 'true') {
            return true;
        }
        return false;
    }

    function createCheckbox(handler) {
        var checkbox = document.createElement('input');
        checkbox.type = "checkbox";
        checkbox.id = "autologin";
        if (isAutoLoginEnabled()) {
            checkbox.checked = true;
        }
        checkbox.addEventListener('change', function() {
            localStorage.setItem('autologin',this.checked);
            if(typeof handler == 'function') {
                handler(this.checked);
            }
        });

        return checkbox;
    }

})();