一键下载一网畅学平台上的课件
// ==UserScript==
// @name USST Downloader
// @namespace https://www.zhihu.com/people/tekcor_
// @version 1.0
// @description 一键下载一网畅学平台上的课件
// @author tekcor
// @match https://1906.usst.edu.cn/course/*
// @grant GM_download
// @grant GM_addStyle
// @license MIT license
// @run-at document-start
// ==/UserScript==
(function() {
'use strict';
const TARGET_URL_PART = "sub_course_id";
const INTERMEDIATE_URL_TEMPLATE ="https://1906.usst.edu.cn//api/uploads/reference/document/{REFERENCE_ID}/url?preview=true";
let currentFileFinalUrl = null; // 用于存储类型1数据的最终下载链接
let allActivitiesData = null; // 用于存储类型2数据的 activities 数组
console.log("油猴脚本 (v1.0) - USST Downloader - 已启动");
// --- UI 创建 ---
function createControlPanel() {
const panel = document.createElement('div');
panel.id = 'userscript-download-panel';
panel.innerHTML = `
<div style="font-weight: bold; margin-bottom: 5px; padding-bottom: 3px; border-bottom: 1px solid #ccc;">下载助手</div>
<button id="btnDownloadCurrentUserscript" disabled>下载当前文件</button>
<button id="btnDownloadAllUserscript" disabled style="margin-top: 5px;">下载全部文件</button>
`;
document.body.appendChild(panel);
GM_addStyle(`
#userscript-download-panel {
position: fixed;
top: 20px;
right: 20px;
background-color: #f0f0f0;
border: 1px solid #ccc;
padding: 10px;
z-index: 9999;
font-family: sans-serif;
font-size: 12px;
border-radius: 5px;
box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
#userscript-download-panel button {
display: block;
width: 100%;
padding: 5px;
font-size: 12px;
cursor: pointer;
border: 1px solid #bbb;
border-radius: 3px;
background-color: #e7e7e7;
}
#userscript-download-panel button:disabled {
cursor: not-allowed;
opacity: 0.6;
}
#userscript-download-panel button:not(:disabled):hover {
background-color: #d7d7d7;
}
`);
document.getElementById('btnDownloadCurrentUserscript').addEventListener('click', handleDownloadCurrent);
document.getElementById('btnDownloadAllUserscript').addEventListener('click', handleDownloadAll);
}
function extractFilenameFromUrl(fileUrl, defaultFilenamePrefix, referenceId = '') {
try {
const urlObj = new URL(fileUrl);
const nameParam = urlObj.searchParams.get('name');
if (nameParam) {
return decodeURIComponent(nameParam);
}
} catch (e) {
console.error(`[油猴脚本-UI] 解析URL提取文件名时出错: "${fileUrl}"`, e);
}
return `${defaultFilenamePrefix}_${referenceId || Date.now()}.pdf`;
}
// --- 下载处理函数 ---
function handleDownloadCurrent() {
if (!currentFileFinalUrl) {
alert("没有可供下载的“当前文件”链接。");
return;
}
const btn = document.getElementById('btnDownloadCurrentUserscript');
btn.disabled = true;
btn.textContent = "下载中...";
const filename = extractFilenameFromUrl(currentFileFinalUrl, "current_file");
console.log(`[油猴脚本-UI] “下载当前文件”点击。文件名: "${filename}", URL: ${currentFileFinalUrl}`);
GM_download(currentFileFinalUrl, filename);
// 考虑是否下载后重置状态或让用户可以再次点击
setTimeout(() => { // 延迟一点恢复按钮状态
btn.textContent = "下载当前文件";
// currentFileFinalUrl = null; // 如果只允许一次下载，则取消注释
// btn.disabled = !currentFileFinalUrl; // 根据currentFileFinalUrl是否重置来决定
btn.disabled = false; // 允许重复下载同一个“当前文件”
}, 2000);
}
async function handleDownloadAll() {
if (!allActivitiesData || allActivitiesData.length === 0) {
alert("没有可供“下载全部”的数据。");
return;
}
const btn = document.getElementById('btnDownloadAllUserscript');
btn.disabled = true;
btn.textContent = "下载中...";
console.log(`[油猴脚本-UI] “下载全部”点击。共 ${allActivitiesData.length} 个 activity。`);
let downloadedCount = 0;
for (let index = 0; index < allActivitiesData.length; index++) {
const activity = allActivitiesData[index];
const logPrefix = "[油猴脚本-UI DownloadAll]";
if (!activity) { console.log(`${logPrefix} Activity #${index}: 元素为空，跳过。`); continue; }
if (activity.uploads && Array.isArray(activity.uploads) && activity.uploads.length > 0) {
const firstUpload = activity.uploads[0];
if (firstUpload && typeof firstUpload.reference_id !== 'undefined') {
const referenceId = firstUpload.reference_id;
console.log(`${logPrefix} Activity #${index}: 找到 reference_id: ${referenceId}`);
const intermediateUrl = INTERMEDIATE_URL_TEMPLATE.replace("{REFERENCE_ID}", referenceId);
btn.textContent = `下载中 (${index + 1}/${allActivitiesData.length})...`;
console.log(`${logPrefix} Activity #${index}: (步骤1) 请求中间URL: ${intermediateUrl}`);
try {
const res = await originalFetch(intermediateUrl);
if (!res.ok) { throw new Error(`网络错误 (状态 ${res.status}) for ${intermediateUrl}`); }
const intermediateJsonData = await res.json();
console.log(`${logPrefix} Activity #${index}: (步骤2) 收到中间JSON:`, intermediateJsonData);
if (intermediateJsonData && typeof intermediateJsonData.url === 'string' && intermediateJsonData.url.startsWith('http') && intermediateJsonData.status === "ready") {
const finalDownloadUrl = intermediateJsonData.url;
const filename = extractFilenameFromUrl(finalDownloadUrl, `activity_${index}_file`, referenceId);
console.log(`${logPrefix} Activity #${index}: (步骤3) 最终URL: ${finalDownloadUrl}, 文件名: "${filename}"`);
GM_download(finalDownloadUrl, filename);
downloadedCount++;
console.log(`${logPrefix} Activity #${index}: (步骤4) GM_download 已调用。`);
// 可选：在每个下载间添加短暂延迟
// await new Promise(resolve => setTimeout(resolve, 500));
} else {
console.error(`${logPrefix} Activity #${index}: 中间JSON格式不正确或status不为ready。`, intermediateJsonData);
}
} catch (err) {
console.error(`${logPrefix} Activity #${index}: 处理中间URL (${intermediateUrl}) 时出错:`, err);
}
} else { console.log(`${logPrefix} Activity #${index}: 'uploads[0]' 中未找到 reference_id。`); }
} else { console.log(`${logPrefix} Activity #${index}: 'uploads' 为空或无效。`); }
}
console.log(`[油猴脚本-UI] “下载全部”完成，尝试下载 ${downloadedCount} 个文件。`);
btn.textContent = "下载全部 (列表)";
// allActivitiesData = null; // 如果只允许一次下载，则取消注释
// btn.disabled = !allActivitiesData; // 根据allActivitiesData是否重置来决定
btn.disabled = false; // 允许重复下载同一个列表
}
// --- 网络请求拦截处理 ---
function processJsonResponse(jsonData, requestTypePrefix) { // requestTypePrefix is "[油猴脚本-Fetch]" or "[油猴脚本-XHR]"
console.log(`${requestTypePrefix} 正在分析JSON结构...`, jsonData);
// 类型1: 直接在根级别有 uploads 数组，且没有 activities 数组
if (jsonData.uploads && Array.isArray(jsonData.uploads) && jsonData.uploads.length > 0 && typeof jsonData.activities === 'undefined') {
console.log(`${requestTypePrefix} 检测到类型1 JSON (直接uploads)`);
const firstUpload = jsonData.uploads[0];
if (firstUpload && typeof firstUpload.reference_id !== 'undefined') {
const referenceId = firstUpload.reference_id;
const intermediateUrl = INTERMEDIATE_URL_TEMPLATE.replace("{REFERENCE_ID}", referenceId);
console.log(`${requestTypePrefix} 类型1: (步骤1) 请求中间URL: ${intermediateUrl}`);
originalFetch(intermediateUrl)
.then(res => {
if (!res.ok) { throw new Error(`网络错误 (状态 ${res.status}) for ${intermediateUrl}`); }
return res.json();
})
.then(intermediateJsonData => {
console.log(`${requestTypePrefix} 类型1: (步骤2) 收到中间JSON:`, intermediateJsonData);
if (intermediateJsonData && typeof intermediateJsonData.url === 'string' && intermediateJsonData.url.startsWith('http') && intermediateJsonData.status === "ready") {
currentFileFinalUrl = intermediateJsonData.url; // 存储最终链接
console.log(`${requestTypePrefix} 类型1: (步骤3) 已存储“当前文件”下载链接: ${currentFileFinalUrl}`);
const btn = document.getElementById('btnDownloadCurrentUserscript');
if (btn) { btn.disabled = false; btn.title = `准备下载: ${extractFilenameFromUrl(currentFileFinalUrl, "current_file")}`; }
} else {
console.error(`${requestTypePrefix} 类型1: 中间JSON格式不正确或status不为ready。`, intermediateJsonData);
}
})
.catch(err => {
console.error(`${requestTypePrefix} 类型1: 处理中间URL (${intermediateUrl}) 时出错:`, err);
});
} else { console.log(`${requestTypePrefix} 类型1: 'uploads[0]' 中未找到 reference_id。`); }
}
// 类型2: 有 activities 数组 (我们之前的逻辑)
else if (jsonData.activities && Array.isArray(jsonData.activities) && jsonData.activities.length > 0) {
console.log(`${requestTypePrefix} 检测到类型2 JSON (activities数组 - ${jsonData.activities.length} 项)`);
allActivitiesData = jsonData.activities; // 存储整个数组
console.log(`${requestTypePrefix} 类型2: 已存储 "activities" 数据供“下载全部”使用。`);
const btn = document.getElementById('btnDownloadAllUserscript');
if (btn) { btn.disabled = false; btn.title = `准备下载列表中的 ${allActivitiesData.length} 个项目`; }
}
// 未知结构
else {
console.log(`${requestTypePrefix} 未识别的JSON结构，不包含直接 'uploads' 或 'activities' 数组。`);
}
}
// --- Fetch Interception ---
const originalFetch = window.fetch;
window.fetch = async function(...args) {
const [resource, config] = args;
let requestUrl = '';
if (typeof resource === 'string') { requestUrl = resource; }
else if (resource instanceof Request) { requestUrl = resource.url; }
else { try { requestUrl = resource.href; } catch (e) { return originalFetch(...args); } }
aswwsse
const responsePromise = originalFetch(...args);
if (requestUrl && requestUrl.includes(TARGET_URL_PART)) {
try {
const response = await responsePromise;
const clonedResponse = response.clone();
const jsonData = await clonedResponse.json();
processJsonResponse(jsonData, "[油猴脚本-Fetch]");
} catch (error) {
console.error("[油猴脚本-Fetch] 拦截和处理主数据时出错:", error);
}
}
return responsePromise;
};
// --- XMLHttpRequest Interception ---
const originalXhrOpen = XMLHttpRequest.prototype.open;
const originalXhrSend = XMLHttpRequest.prototype.send;
XMLHttpRequest.prototype.open = function(method, url, ...rest) {
this._requestUrl = url;
return originalXhrOpen.apply(this, [method, url, ...rest]);
};
XMLHttpRequest.prototype.send = function(...sendArgs) {
this.addEventListener('load', function() {
if (this._requestUrl && typeof this._requestUrl === 'string' && this._requestUrl.includes(TARGET_URL_PART)) {
if (this.readyState === 4 && (this.status >= 200 && this.status < 300)) {
try {
const jsonData = JSON.parse(this.responseText);
processJsonResponse(jsonData, "[油猴脚本-XHR]");
} catch (e) {
console.error('[油猴脚本-XHR] 拦截和处理主数据时出错:', e);
}
} else if (this.readyState === 4) { /* ... */ }
}
});
return originalXhrSend.apply(this, sendArgs);
};
// --- 脚本启动 ---
if (document.readyState === 'complete' || document.readyState === 'interactive') {
createControlPanel();
} else {
document.addEventListener('DOMContentLoaded', createControlPanel);
}
console.log("[油猴脚本] Fetch 和 XMLHttpRequest 拦截器已设置。UI面板将很快创建。");
})();