补充附件中 <a> 元素的 download 属性
// ==UserScript==
// @name BIT-补足下载附件时的默认文件名
// @namespace http://tampermonkey.net/
// @version 0.2.14
// @description 补充附件中 <a> 元素的 download 属性
// @license GPL-3.0-or-later
// @supportURL https://github.com/YDX-2147483647/BIT-enhanced/issues
// @author Y.D.X.
// @match https://jxzx.bit.edu.cn/*.htm
// @match https://jwb.bit.edu.cn/*.htm
// @match https://student.bit.edu.cn/*
// @match https://www.bit.edu.cn/*.htm
// @match https://opt.bit.edu.cn/*.htm
// @match https://mingde.bit.edu.cn/*.htm
// @match https://xuteli.bit.edu.cn/*.htm
// @match https://xcb.bit.edu.cn/*.htm
// @match https://grd.bit.edu.cn/*.htm
// @match https://sie.bit.edu.cn/*.htm
// @match https://cs.bit.edu.cn/*.htm
// @grant none
// ==/UserScript==
(function () {
'use strict'
// 优先使用在前面的 title_selector
const matches = [
{ // 教学中心
host: 'jxzx',
attachments_selector: '.pageArticle > .Annex > ul > li > a'
},
{ // 教务部
host: 'jwb',
attachments_selector: '.Annex > ul > li > a'
},
{ // World Wide Web
host: 'www',
attachments_selector: '.article .Annex > ul > li > a'
},
{ // Student
host: 'student',
attachments_selector: '.fujian > ul > li > a'
},
{ // Optics
host: 'opt',
attachments_selector: '.fujian > ul > li > a'
},
{ // 明德
host: 'mingde',
attachments_selector: '.pageArticle .Annex > ul > li > a'
},
{ // 徐特立
host: 'xuteli',
attachments_selector: '.annex > ul > li > a'
},
{ // 宣传部
host: 'xcb',
attachments_selector: '.rt_fujian > ul > li > a'
},
{ // Graduate
host: 'grd',
attachments_selector: '.gp-annex3 > ul > li > a'
},
{ // School of Information and Electronics
host: 'sie',
attachments_selector: '.annexList > li > a'
},
{ // Computer Science
host: 'cs',
attachments_selector: '.fujian > ul > li > a'
}
]
/**
* 猜测带有扩展名的文件名
*
* @param {string} text
* @param {string} url
* @returns {string}
*/
function guess_filename (text, url) {
const SUFFIX_PATTERN = /\.[0-9a-zA-Z]+$/
const match_text = SUFFIX_PATTERN.exec(text)
const suffix_by_text = match_text !== null ? match_text[0] : null
const match_url = SUFFIX_PATTERN.exec(url)
const suffix_by_url = match_url !== null ? match_url[0] : null
if (suffix_by_url === null) {
// 若`url`无更多信息，则照抄`text`
return text
} else {
// 若`url`提供了信息
if (suffix_by_text === null) {
// 若`text`缺扩展名，则加上扩展名
// 这是最常见的情况。
return text + suffix_by_url
} else {
// 若`text`也疑似有扩展名，则与`url`的比较一下，看情况决定是否加上
if (suffix_by_text === suffix_by_url) {
return text
}
if (suffix_by_text.match(/^\.[0-9]+$/) || (suffix_by_text.length < suffix_by_url)) {
// 例：`text`是`XeTeX-3.141592653-2.6-0.999996`，那么`suffix_by_text`会是`.999996`，并非真的扩展名。
return text + suffix_by_url
} else {
return text
}
}
}
}
function set_attachments_filenames () {
const site_host = window.location.host
for (const s of matches) {
if (site_host === `${s.host}.bit.edu.cn`) {
document.querySelectorAll(s.attachments_selector).forEach(attach => {
if (!attach.download) {
attach.download = guess_filename(attach.textContent, attach.href)
}
})
break
}
}
}
set_attachments_filenames()
})()