Download PW course content
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// ==UserScript==
// @name PW Course Downloader
// @namespace KorigamiK
// @version 1.0.0
// @description Download PW course content
// @author KorigamiK
// @match https://www.pw.live/*
// @grant GM_addStyle
// @require https://cdnjs.cloudflare.com/ajax/libs/jszip/3.9.1/jszip.min.js
// @license MIT
// ==/UserScript==
// deno-lint-ignore-file no-window
const API = {
BASE_URL: "https://api.penpencil.co",
BATCH_ID: "671f543f10df7bb168d0296a",
SESSION_TOKEN: /* Paste your session token here */ "Bearer ...",
async fetch(endpoint) {
const res = await fetch(`${this.BASE_URL}${endpoint}`, {
headers: { Authorization: this.SESSION_TOKEN },
});
return res.json();
},
getBatch: (slug) => API.fetch(`/v3/batches/${slug}/details`),
getContent: (batchSlug, subjectSlug, type = "videos") =>
API.fetch(
`/v2/batches/${batchSlug}/subject/${subjectSlug}/contents?contentType=${type}`,
),
getTests: (subjectId) =>
API.fetch(
`/v3/test-service/tests/check-tests?testSource=BATCH_QUIZ&batchId=${API.BATCH_ID}&batchSubjectId=${subjectId}`,
),
getDPPs: (subjectId) =>
API.fetch(
`/v3/test-service/tests/dpp?batchId=${API.BATCH_ID}&batchSubjectId=${subjectId}&isSubjective=false`,
),
};
const UI = {
styles: `
.pw-dl {
position: fixed;
bottom: 20px;
right: 20px;
background: #fff;
border-radius: 8px;
box-shadow: 0 2px 12px rgba(0,0,0,0.15);
padding: 15px;
z-index: 9999;
width: 300px;
font-family: system-ui;
}
.pw-dl select { width: 100%; margin: 8px 0; padding: 5px; }
.pw-dl button {
background: #4CAF50;
color: white;
border: none;
padding: 8px 16px;
border-radius: 4px;
cursor: pointer;
width: 100%;
}
.pw-dl .status {
font-size: 14px;
color: #666;
margin-top: 8px;
}
`,
create() {
// Check if UI already exists
if (document.querySelector(".pw-dl")) {
return document.querySelector(".pw-dl");
}
GM_addStyle(this.styles);
const container = document.createElement("div");
container.className = "pw-dl";
container.innerHTML = `
<select multiple size="5"></select>
<button class="download-selected">Download Selected</button>
<div class="status"></div>
`;
document.body.appendChild(container);
return container;
},
updateStatus(msg) {
document.querySelector(".pw-dl .status").textContent = msg;
},
};
class ContentDownloader {
constructor(batchSlug) {
if (window.pwDownloaderInstance) {
return window.pwDownloaderInstance;
}
this.batchSlug = batchSlug;
this.subjects = [];
this.zip = new JSZip();
this.init();
window.pwDownloaderInstance = this;
}
async init() {
const ui = UI.create();
const select = ui.querySelector("select");
// Add download all buttons
ui.querySelector("button").insertAdjacentHTML(
"beforebegin",
`
<div style="display: flex; gap: 8px; margin-bottom: 8px;">
<button class="download-all">Download All Content</button>
<button class="download-pdfs">Download All PDFs</button>
</div>
`,
);
try {
const { data } = await API.getBatch(this.batchSlug);
this.subjects = data.subjects;
select.innerHTML = this.subjects
.map((s) => `<option value="${s._id}">${s.subject}</option>`)
.join("");
ui.querySelector(".download-selected").addEventListener(
"click",
() => this.downloadSelected(select),
);
ui.querySelector(".download-all").addEventListener(
"click",
() => this.downloadAll(),
);
ui.querySelector(".download-pdfs").addEventListener(
"click",
() => this.downloadAllPDFs(),
);
} catch (err) {
UI.updateStatus("Failed to load subjects");
console.error(err);
}
}
async downloadSelected(select) {
const selectedOptions = [...select.selectedOptions];
if (selectedOptions.length === 0) {
UI.updateStatus("Please select subjects");
return;
}
const selectedSubjects = selectedOptions
.map((option) => this.subjects.find((s) => s._id === option.value))
.filter(Boolean);
UI.updateStatus(`Processing ${selectedSubjects.length} subjects...`);
try {
this.zip = new JSZip();
const rootFolder = this.zip.folder("PW Selected Subjects");
let totalPdfs = 0;
let processedPdfs = 0;
let totalSize = 0;
for (const [index, subject] of selectedSubjects.entries()) {
try {
UI.updateStatus(
`Processing ${subject.subject} (${
index + 1
}/${selectedSubjects.length})...`,
);
const subjectFolder = rootFolder.folder(
this.sanitizeFileName(subject.subject),
);
const content = await this.getSubjectContent(subject);
// Add content JSON
const contentJson = JSON.stringify(content, null, 2);
subjectFolder.file("content.json", contentJson);
totalSize += contentJson.length;
// Process PDFs
if (content.notes?.length) {
const pdfFolder = subjectFolder.folder("PDFs");
const pdfs = this.extractPdfLinks(content.notes);
totalPdfs += pdfs.length;
if (pdfs.length) {
const pdfSizes = await this.processPdfs(
pdfs,
pdfFolder,
(processed) => {
processedPdfs += processed;
UI.updateStatus(
`Downloaded ${processedPdfs}/${totalPdfs} PDFs...`,
);
},
);
totalSize += pdfSizes.reduce((a, b) => a + b, 0);
}
}
// Check total size
if (totalSize > 1.5 * 1024 * 1024 * 1024) { // 1.5GB limit
throw new Error(
"Content size too large. Try selecting fewer subjects.",
);
}
} catch (error) {
console.error(`Error processing subject ${subject.subject}:`, error);
UI.updateStatus(
`Warning: Some content for ${subject.subject} might be missing`,
);
await new Promise((resolve) => setTimeout(resolve, 1000));
}
}
UI.updateStatus("Creating ZIP file... This might take a moment.");
try {
const zipBlob = await this.generateZipBlob();
if (!this.isValidBlob(zipBlob)) {
throw new Error("Invalid ZIP file generated");
}
await this.downloadZip(zipBlob);
UI.updateStatus("Download complete!");
} catch (error) {
throw new Error(`ZIP creation failed: ${error.message}`);
}
} catch (error) {
console.error("Download error:", error);
UI.updateStatus(
`Error: ${error.message}. Try downloading fewer subjects.`,
);
} finally {
this.zip = new JSZip();
}
}
async generateZipBlob() {
return await this.zip.generateAsync({
type: "blob",
compression: "DEFLATE",
compressionOptions: { level: 6 },
})
}
isValidBlob(blob) {
return blob && blob instanceof Blob && blob.size > 0;
}
async processPdfs(pdfs, folder, progressCallback) {
const chunks = this.chunkArray(pdfs, 3);
let processedCount = 0;
const sizes = [];
for (const chunk of chunks) {
const chunkPromises = chunk.map(async (pdf) => {
try {
const response = await fetch(pdf.url);
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);
}
const blob = await response.blob();
folder.file(this.sanitizeFileName(pdf.filename), blob);
sizes.push(blob.size);
return true;
} catch (error) {
console.error(`Failed to download PDF: ${pdf.filename}`, error);
return false;
}
});
const results = await Promise.allSettled(chunkPromises);
const successCount = results.filter((r) =>
r.status === "fulfilled" && r.value
).length;
processedCount += successCount;
progressCallback(successCount);
await new Promise((resolve) => setTimeout(resolve, 500));
}
return sizes;
}
downloadZip(blob) {
return new Promise((resolve, reject) => {
try {
if (!this.isValidBlob(blob)) {
reject(new Error("Invalid ZIP blob"));
return;
}
const url = URL.createObjectURL(blob);
const a = document.createElement("a");
a.href = url;
const timestamp = new Date().toISOString().split("T")[0];
a.download = `pw_selected_subjects_${timestamp}.zip`;
a.onclick = () => {
setTimeout(() => {
URL.revokeObjectURL(url);
resolve();
}, 1000);
};
a.click();
} catch (error) {
reject(error);
}
});
}
extractPdfLinks(notes) {
const pdfs = [];
notes.forEach((note) => {
note.homeworkIds?.forEach((homework) => {
homework.attachmentIds?.forEach((attachment) => {
pdfs.push({
topic: homework.topic,
url: `${attachment.baseUrl}${attachment.key}`,
filename: attachment.name,
});
});
});
});
return pdfs;
}
async downloadAll() {
UI.updateStatus("Downloading all content...");
const content = {};
for (const subject of this.subjects) {
UI.updateStatus(`Downloading ${subject.subject}...`);
content[subject.subject] = await this.getSubjectContent(subject);
}
this.saveToFile(content, "all_content");
UI.updateStatus("All content downloaded!");
}
async downloadAllPDFs() {
UI.updateStatus("Gathering PDF links...");
const pdfs = [];
// Create main folder in zip
const rootFolder = this.zip.folder("PW Course PDFs");
for (const subject of this.subjects) {
UI.updateStatus(`Processing ${subject.subject}...`);
const { notes } = await this.getSubjectContent(subject);
// Create subject folder
const subjectFolder = rootFolder.folder(
this.sanitizeFileName(subject.subject),
);
notes.forEach((note) => {
note.homeworkIds?.forEach((homework) => {
homework.attachmentIds?.forEach((attachment) => {
pdfs.push({
subject: subject.subject,
topic: homework.topic,
url: `${attachment.baseUrl}${attachment.key}`,
filename: attachment.name,
folder: subjectFolder,
});
});
});
});
}
if (pdfs.length === 0) {
UI.updateStatus("No PDFs found!");
return;
}
UI.updateStatus(`Found ${pdfs.length} PDFs. Starting download...`);
try {
await this.downloadAndZipPDFs(pdfs);
} catch (error) {
console.error("Error creating ZIP:", error);
UI.updateStatus("Error creating ZIP file!");
}
}
async downloadAndZipPDFs(pdfs) {
let completed = 0;
// Download all PDFs concurrently but with rate limiting
const chunks = this.chunkArray(pdfs, 5); // Process 5 PDFs at a time
for (const chunk of chunks) {
await Promise.all(chunk.map(async (pdf) => {
try {
const response = await fetch(pdf.url);
const blob = await response.blob();
// Add to appropriate folder in zip
const safeName = this.sanitizeFileName(pdf.filename);
pdf.folder.file(safeName, blob);
completed++;
UI.updateStatus(`Processing PDFs: ${completed}/${pdfs.length}`);
} catch (error) {
console.error(`Failed to process ${pdf.filename}:`, error);
}
}));
}
UI.updateStatus("Creating ZIP file...");
// Generate and download ZIP
const zipBlob = await this.zip.generateAsync({
type: "blob",
compression: "DEFLATE",
compressionOptions: {
level: 6,
},
});
const url = URL.createObjectURL(zipBlob);
const a = document.createElement("a");
a.href = url;
a.download = `pw_course_pdfs_${new Date().toISOString().split("T")[0]}.zip`;
a.click();
URL.revokeObjectURL(url);
// Reset zip for next use
this.zip = new JSZip();
UI.updateStatus("All PDFs downloaded in ZIP!");
}
// Utility methods
sanitizeFileName(filename) {
return filename.replace(/[/\\?%*:|"<>]/g, "-");
}
chunkArray(array, size) {
const chunks = [];
for (let i = 0; i < array.length; i += size) {
chunks.push(array.slice(i, i + size));
}
return chunks;
}
async getSubjectContent(subject) {
const [videos, notes, tests, dpps] = await Promise.all([
API.getContent(this.batchSlug, subject.slug, "videos"),
API.getContent(this.batchSlug, subject.slug, "notes"),
API.getTests(subject._id),
API.getDPPs(subject._id),
]);
return {
videos: videos.data.map((v) => ({
title: v.topic,
url: v.url,
date: v.date,
duration: v.videoDetails?.duration,
teacher: v.teachers?.[0]
? `${v.teachers[0].firstName} ${v.teachers[0].lastName}`.trim()
: "Unknown Teacher",
})),
notes: notes.data,
tests: tests.data,
dpps: dpps.data,
};
}
saveToFile(data, prefix = "content") {
const blob = new Blob([JSON.stringify(data, null, 2)], {
type: "application/json",
});
const url = URL.createObjectURL(blob);
const a = document.createElement("a");
a.href = url;
a.download = `pw_${prefix}_${new Date().toISOString().split("T")[0]}.json`;
a.click();
URL.revokeObjectURL(url);
}
}
// Initialize only if not already initialized
if (!window.pwDownloaderInstance) {
new ContentDownloader(
"crash-course-gate-2025-computer-science-and-it-200846",
);
}