xkhelper.user.js

// ==UserScript==
// @name                选课登录助手
// @namespace	        org.wangqr.xkhelper
// @description	      选课登录界面的功能补充，增加记住用户名功能 *仅在Firefox测试通过*
// @grant       none
// @run-at      document-end
// @include		https://zhjwxk.cic.tsinghua.edu.cn/*
// @include		https://zhjwxkyw.cic.tsinghua.edu.cn/*
// @include		http://zhjwxk.cic.tsinghua.edu.cn/*
// @include		http://zhjwxkyw.cic.tsinghua.edu.cn/*
// ==/UserScript==
function md5cycle(x, k) {
  var a = x[0],
  b = x[1],
  c = x[2],
  d = x[3];
  a = ff(a, b, c, d, k[0], 7, - 680876936);
  d = ff(d, a, b, c, k[1], 12, - 389564586);
  c = ff(c, d, a, b, k[2], 17, 606105819);
  b = ff(b, c, d, a, k[3], 22, - 1044525330);
  a = ff(a, b, c, d, k[4], 7, - 176418897);
  d = ff(d, a, b, c, k[5], 12, 1200080426);
  c = ff(c, d, a, b, k[6], 17, - 1473231341);
  b = ff(b, c, d, a, k[7], 22, - 45705983);
  a = ff(a, b, c, d, k[8], 7, 1770035416);
  d = ff(d, a, b, c, k[9], 12, - 1958414417);
  c = ff(c, d, a, b, k[10], 17, - 42063);
  b = ff(b, c, d, a, k[11], 22, - 1990404162);
  a = ff(a, b, c, d, k[12], 7, 1804603682);
  d = ff(d, a, b, c, k[13], 12, - 40341101);
  c = ff(c, d, a, b, k[14], 17, - 1502002290);
  b = ff(b, c, d, a, k[15], 22, 1236535329);
  a = gg(a, b, c, d, k[1], 5, - 165796510);
  d = gg(d, a, b, c, k[6], 9, - 1069501632);
  c = gg(c, d, a, b, k[11], 14, 643717713);
  b = gg(b, c, d, a, k[0], 20, - 373897302);
  a = gg(a, b, c, d, k[5], 5, - 701558691);
  d = gg(d, a, b, c, k[10], 9, 38016083);
  c = gg(c, d, a, b, k[15], 14, - 660478335);
  b = gg(b, c, d, a, k[4], 20, - 405537848);
  a = gg(a, b, c, d, k[9], 5, 568446438);
  d = gg(d, a, b, c, k[14], 9, - 1019803690);
  c = gg(c, d, a, b, k[3], 14, - 187363961);
  b = gg(b, c, d, a, k[8], 20, 1163531501);
  a = gg(a, b, c, d, k[13], 5, - 1444681467);
  d = gg(d, a, b, c, k[2], 9, - 51403784);
  c = gg(c, d, a, b, k[7], 14, 1735328473);
  b = gg(b, c, d, a, k[12], 20, - 1926607734);
  a = hh(a, b, c, d, k[5], 4, - 378558);
  d = hh(d, a, b, c, k[8], 11, - 2022574463);
  c = hh(c, d, a, b, k[11], 16, 1839030562);
  b = hh(b, c, d, a, k[14], 23, - 35309556);
  a = hh(a, b, c, d, k[1], 4, - 1530992060);
  d = hh(d, a, b, c, k[4], 11, 1272893353);
  c = hh(c, d, a, b, k[7], 16, - 155497632);
  b = hh(b, c, d, a, k[10], 23, - 1094730640);
  a = hh(a, b, c, d, k[13], 4, 681279174);
  d = hh(d, a, b, c, k[0], 11, - 358537222);
  c = hh(c, d, a, b, k[3], 16, - 722521979);
  b = hh(b, c, d, a, k[6], 23, 76029189);
  a = hh(a, b, c, d, k[9], 4, - 640364487);
  d = hh(d, a, b, c, k[12], 11, - 421815835);
  c = hh(c, d, a, b, k[15], 16, 530742520);
  b = hh(b, c, d, a, k[2], 23, - 995338651);
  a = ii(a, b, c, d, k[0], 6, - 198630844);
  d = ii(d, a, b, c, k[7], 10, 1126891415);
  c = ii(c, d, a, b, k[14], 15, - 1416354905);
  b = ii(b, c, d, a, k[5], 21, - 57434055);
  a = ii(a, b, c, d, k[12], 6, 1700485571);
  d = ii(d, a, b, c, k[3], 10, - 1894986606);
  c = ii(c, d, a, b, k[10], 15, - 1051523);
  b = ii(b, c, d, a, k[1], 21, - 2054922799);
  a = ii(a, b, c, d, k[8], 6, 1873313359);
  d = ii(d, a, b, c, k[15], 10, - 30611744);
  c = ii(c, d, a, b, k[6], 15, - 1560198380);
  b = ii(b, c, d, a, k[13], 21, 1309151649);
  a = ii(a, b, c, d, k[4], 6, - 145523070);
  d = ii(d, a, b, c, k[11], 10, - 1120210379);
  c = ii(c, d, a, b, k[2], 15, 718787259);
  b = ii(b, c, d, a, k[9], 21, - 343485551);
  x[0] = add32(a, x[0]);
  x[1] = add32(b, x[1]);
  x[2] = add32(c, x[2]);
  x[3] = add32(d, x[3]);
}
function cmn(q, a, b, x, s, t) {
  a = add32(add32(a, q), add32(x, t));
  return add32((a << s) | (a >>> (32 - s)), b);
}
function ff(a, b, c, d, x, s, t) {
  return cmn((b & c) | ((~b) & d), a, b, x, s, t);
}
function gg(a, b, c, d, x, s, t) {
  return cmn((b & d) | (c & (~d)), a, b, x, s, t);
}
function hh(a, b, c, d, x, s, t) {
  return cmn(b ^ c ^ d, a, b, x, s, t);
}
function ii(a, b, c, d, x, s, t) {
  return cmn(c ^ (b | (~d)), a, b, x, s, t);
}
function md51(s) {
  txt = '';
  var n = s.length,
  state = [
    1732584193,
    - 271733879,
    - 1732584194,
    271733878
  ],
  i;
  for (i = 64; i <= s.length; i += 64) {
    md5cycle(state, md5blk(s.substring(i - 64, i)));
  }
  s = s.substring(i - 64);
  var tail = [
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0
  ];
  for (i = 0; i < s.length; i++)
  tail[i >> 2] |= s.charCodeAt(i) << ((i % 4) << 3);
  tail[i >> 2] |= 128 << ((i % 4) << 3);
  if (i > 55) {
    md5cycle(state, tail);
    for (i = 0; i < 16; i++) tail[i] = 0;
  }
  tail[14] = n * 8;
  md5cycle(state, tail);
  return state;
}
function md5blk(s) {
  var md5blks = [
  ],
  i;
  for (i = 0; i < 64; i += 4) {
    md5blks[i >> 2] = s.charCodeAt(i)
    + (s.charCodeAt(i + 1) << 8)
    + (s.charCodeAt(i + 2) << 16)
    + (s.charCodeAt(i + 3) << 24);
  }
  return md5blks;
}
var hex_chr = '0123456789abcdef'.split('');
function rhex(n)
{
  var s = '',
  j = 0;
  for (; j < 4; j++)
  s += hex_chr[(n >> (j * 8 + 4)) & 15]
  + hex_chr[(n >> (j * 8)) & 15];
  return s;
}
function hex(x) {
  for (var i = 0; i < x.length; i++)
  x[i] = rhex(x[i]);
  return x.join('');
}
function md5(s) {
  return hex(md51(s));
}
function add32(a, b) {
  return (a + b) & 4294967295;
}
function getHash() {
  var img = document.getElementById('captcha');
  var canvas = document.createElement('canvas');
  canvas.width = img.naturalWidth;
  canvas.height = img.naturalHeight;
  var ctx = canvas.getContext('2d');
  ctx.drawImage(img, 0, 0);
  var dataURL = canvas.toDataURL('image/png');
  return md5(dataURL);
}
function retrCaptcha() {
  var retObj = localStorage.getItem('captchaObject');
  document.getElementById('j_username').value = localStorage.getItem('username') || '';
  captchaBox = document.getElementsByName('_login_image_') [0];
  if (retObj) {
    retObj = JSON.parse(retObj);
    if (getHash() in retObj) {
      captchaBox.value = retObj[getHash()];
    } 
    else {
      captchaBox.value = '';
    }
  }
};
function storeCaptcha() {
  var obj = localStorage.getItem('captchaObject');
  if (obj === null) {
    obj = {
    };
  } else {
    obj = JSON.parse(obj);
  }
  obj[getHash()] = captchaBox.value;
  localStorage.setItem('captchaObject', JSON.stringify(obj));
  localStorage.setItem('username', document.getElementById('j_username').value);
};
if (/^https?:\/\/zhjwxk(yw)?\.cic\.tsinghua\.edu\.cn\/xklogin\.do/.test(document.location)) {
  var img = document.getElementById('captcha');
  img.addEventListener('load', retrCaptcha, false);
  var a = document.getElementsByTagName('a')
  var loginButton = [
  ];
  for (var i = 0; i < a.length; ++i) {
    if (a[i].getAttribute('onclick') === 'doLogin();') {
      loginButton = a[i];
    }
  }
  loginButton.addEventListener('click', storeCaptcha, false);
}