点击“开始抽奖”后，随机抽出五名中奖候选者。
// ==UserScript==
// @name 长毛象抽奖脚本
// @namespace https://blog.bgme.me
// @match https://bgme.me/*
// @match https://bgme.bid/*
// @match https://c.bgme.bid/*
// @grant none
// @run-at document-end
// @version 1.0.0
// @author bgme
// @description 点击“开始抽奖”后，随机抽出五名中奖候选者。
// @supportURL https://github.com/yingziwu/Greasemonkey/issues
// @license AGPL-3.0-or-later
// ==/UserScript==
window.addEventListener('load', function () {
activateMastodonLottery();
}, false)
function chromeClickChecker(event) {
return (
event.target.tagName.toLowerCase() === 'i' &&
event.target.classList.contains('fa-ellipsis-h') &&
document.querySelector('div.dropdown-menu') === null
);
}
function firefoxClickChecker(event) {
return (
event.target.tagName.toLowerCase() === 'button' &&
event.target.classList.contains('icon-button') &&
document.querySelector('div.dropdown-menu') === null
);
}
function activateMastodonLottery() {
document.querySelector('body').addEventListener('click', function (event) {
if (chromeClickChecker(event) || firefoxClickChecker(event)) {
// Get the status for this event
let status = event.target.parentNode.parentNode.parentNode.parentNode.parentNode;
if (status.className.match('detailed-status__wrapper')) {
addLotteryLink(status);
}
};
}, false);
}
function addLotteryLink(status) {
setTimeout(function () {
const lotteryStatusUrl = status.querySelector('.detailed-status__datetime').getAttribute('href');
const dropdown = document.querySelector('div.dropdown-menu ul');
const separator = dropdown.querySelector('li.dropdown-menu__separator');
const listItem = document.createElement('li');
listItem.classList.add('dropdown-menu__item');
listItem.classList.add('mastodon__lottery');
const link = document.createElement('a');
link.setAttribute('href', '#');
link.setAttribute('target', '_blank');
link.textContent = '开始抽奖';
link.addEventListener('click', function (e) {
e.preventDefault();
if (!window.lotteryRunning) {
window.lotteryRunning = true;
link.textContent = '抽奖中，请等待……';
run(lotteryStatusUrl).then(() => { window.lotteryRunning = false }).catch(() => { window.lotteryRunning = false });
}
}, false);
listItem.appendChild(link);
dropdown.insertBefore(listItem, separator);
}, 100);
}
async function run(lotteryStatusUrl, lotteryType = 'reblog', candidateNumber = 5) {
// lotteryStatusUrl 抽奖嘟文URL
// lotteryType 抽奖类型：转发（reblog），收藏（favourite）
// candidateNumber 候选中奖者人数
const domain = document.location.hostname;
const token = JSON.parse(document.querySelector('#initial-state').text).meta.access_token;
const API = {
'verify': `https://${domain}/api/v1/accounts/verify_credentials`,
'notifications': `https://${domain}/api/v1/notifications`,
'status': `https://${domain}/api/v1/statuses/`,
};
const searchParamMap = new Map([
['reblog', 'exclude_types[]=follow&exclude_types[]=follow_request&exclude_types[]=favourite&exclude_types[]=mention&exclude_types[]=poll'],
['favourite', 'exclude_types[]=follow&exclude_types[]=follow_request&exclude_types[]=reblog&exclude_types[]=mention&exclude_types[]=poll'],
]);
const searchParam = new URLSearchParams(searchParamMap.get(lotteryType));
const statusID = lotteryStatusUrl.match(/(\d+)$/)[0];
let statusTNumber;
let lotterLog;
logout(`开始抽奖……\n当前浏览器：${navigator.userAgent}\n开始时间：${(new Date()).toISOString()}`);
logout(`抽奖嘟文：${lotteryStatusUrl}，抽奖类型：${lotteryType}，候选中奖者人数：${candidateNumber}\n\n`);
let verify;
[verify, statusTNumber] = await doVerify(API, lotteryStatusUrl, statusID, lotteryType, statusTNumber);
if (!verify) {
throw Error('抽奖嘟文非本人发送');
}
const matchAccouts = await getmatchAccouts(API, statusID, statusTNumber, searchParam);
randomTest(matchAccouts);
const luckGuys = getLuckGuy(matchAccouts);
const cadidatesText = getCandidate(luckGuys, candidateNumber);
const notificationText = `嘿！感谢各位参与本次小抽奖活动。\n${cadidatesText}\n\n希望这条艾特您的信息没有造成骚扰，如您对奖品感兴趣请和我私信联系吧？`;
await postStatus(notificationText, statusID, 'public');
logout(`抽奖结束！\n结束时间：${(new Date()).toISOString()}`);
saveFile(lotterLog, `lotterLog-${Date.now()}.log`, 'text/plain; charset=utf-8');
async function doVerify(API, lotteryStatusUrl, statusID, lotteryType, statusTNumber) {
const v = await request(API.verify);
const s = await request(`${API.status}${statusID}`);
logout(`抽奖嘟文URL：${lotteryStatusUrl}\n回复数：${s.replies_count}，转发数：${s.reblogs_count}，收藏数：${s.favourites_count}`);
const numbers = new Map([['reblog', s.reblogs_count], ['favourite', s.favourites_count]]);
if (numbers.has(lotteryType)) {
statusTNumber = numbers.get(lotteryType);
} else {
throw Error('抽奖类型设置不正确');
}
if (v.acct === s.account.acct && (new URL(s.account.url)).hostname === (new URL(lotteryStatusUrl)).hostname) {
return [true, statusTNumber];
} else {
return [false, statusTNumber];
}
}
async function getmatchAccouts(API, statusID, statusTNumber, searchParam) {
const matchAccouts = [];
while (matchAccouts.length !== statusTNumber) {
const nlist = await request(`${API.notifications}?${searchParam.toString()}`);
searchParam.set('max_id', nlist.slice(-1)[0].id);
nlist.forEach((obj) => {
if (obj.status.id === statusID) {
matchAccouts.push(obj.account.acct);
}
});
}
matchAccouts.sort();
logout(`共有${matchAccouts.length}名符合条件的抽奖参与者\n她们是：`);
matchAccouts.forEach(logout);
return matchAccouts;
}
function randomTest(matchAccouts) {
logout('随机函数测试：');
const testResults = [];
const n = 20;
for (let i = 0; i < (n * 20); i++) {
testResults.push(getRandomIndex(matchAccouts));
}
for (let i = 0; i < n; i++) {
logout(testResults.slice((i * 20), ((i + 1) * 20)).join(', '));
}
}
function getLuckGuy(matchAccouts) {
const luckGuys = [];
const n = matchAccouts.length;
const luckGuysMap = new Map();
for (let i = 0; i < (n * 100); i++) {
const luckGuy = matchAccouts[getRandomIndex(matchAccouts)];
if (luckGuysMap.get(luckGuy)) {
luckGuysMap.set(luckGuy, luckGuysMap.get(luckGuy) + 1);
} else {
luckGuysMap.set(luckGuy, 1);
}
}
luckGuysMap.forEach((v, k, map) => {
luckGuys.push([k, v]);
});
luckGuys.sort((a, b) => (b[1] - a[1]));
return luckGuys;
}
function getCandidate(luckGuys, candidateNumber) {
if (candidateNumber > luckGuys.length) {
throw Error('抽奖参与者太少！')
}
let output = '本次抽奖备选中奖者：';
for (let i = 0; i < candidateNumber; i++) {
output = `${output}\nNo.${i + 1}：@${luckGuys[i][0]} （幸运指数：${luckGuys[i][1]}）`;
}
logout(output);
return output;
}
function getRandomIndex(arr) {
return Math.floor(arr.length * Math.random());
}
async function request(url) {
logout(`正在请求：${url}`);
const resp = await fetch(url, {
headers: {
Authorization: `Bearer ${token}`,
},
method: 'GET',
});
const date = new Date(resp.headers.get('date'));
const request_id = resp.headers.get('x-request-id');
const runtime = resp.headers.get('x-runtime');
const ratelimit_remaining = resp.headers.get('x-ratelimit-remaining');
logout(`请求 ${url} 完成\n请求时间：${date.toISOString()}，API剩余限额：${ratelimit_remaining}，x-runtime：${runtime}，x-request-id：${request_id}`);
return await resp.json();
}
function logout(text) {
console.log(text);
if (lotterLog) {
lotterLog = lotterLog + '\n' + text;
} else {
lotterLog = text;
}
}
function saveFile(data, filename, type) {
const file = new Blob([data], { type: type });
const a = document.createElement('a');
const url = URL.createObjectURL(file);
a.href = url;
a.download = filename;
document.body.appendChild(a);
a.click();
setTimeout(function () {
document.body.removeChild(a);
window.URL.revokeObjectURL(url);
}, 0);
}
async function postStatus(text, in_reply_to_id, visibility = 'public') {
const postDate = {
'in_reply_to_id': in_reply_to_id,
'media_ids': [],
'poll': null,
'sensitive': false,
'spoiler_text': '',
'status': text,
'visibility': visibility,
};
logout(`发送嘟文中……\n嘟文内容：\n${text}\n回复嘟文ID：${in_reply_to_id}\n可见范围：${visibility}`);
const resp = await fetch(API.status, {
'headers': {
'Content-Type': 'application/json;charset=utf-8',
'Authorization': `Bearer ${token}`,
},
'body': JSON.stringify(postDate),
'method': 'POST',
'mode': 'cors',
});
const date = new Date(resp.headers.get('date'));
const request_id = resp.headers.get('x-request-id');
const runtime = resp.headers.get('x-runtime');
const ratelimit_remaining = resp.headers.get('x-ratelimit-remaining');
logout(`嘟文发送完成，完成请求时间：${date.toISOString()}，API剩余限额：${ratelimit_remaining}，x-runtime：${runtime}，x-request-id：${request_id}`);
return await resp.json();
}
}