LearnSpace: full-stack educational whiteboard platform
Node.js/Express backend + vanilla JS frontend. Features: real-time collaborative whiteboard (SSE), multi-page support, LaTeX formulas, shapes/connectors, coordinate systems, number lines, compass, zoom/pan, Catmull-Rom pencil smoothing, ruler/protractor with rotation & resize controls, minimap navigation overlay, auto-measurements, multi-page thumbnails sidebar, PNG export, page templates. Student/teacher workflows: classes, assignments, library, dashboard. Mobile responsive. SQLite (better-sqlite3). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Maxim Dolgolyov
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const db = require('../db/db');
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const { emit, emitToClass } = require('../sse');
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/* POST /api/live — teacher creates live session */
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function create(req, res) {
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const { class_id } = req.body;
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const teacher = req.user;
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if (!class_id) return res.status(400).json({ error: 'class_id required' });
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const cls = teacher.role === 'admin'
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? db.prepare('SELECT id, name FROM classes WHERE id=?').get(class_id)
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: db.prepare('SELECT id, name FROM classes WHERE id=? AND teacher_id=?').get(class_id, teacher.id);
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if (!cls) return res.status(403).json({ error: 'Forbidden' });
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// End any active session for this class
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db.prepare(`UPDATE live_sessions SET status='finished', ended_at=datetime('now')
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WHERE class_id=? AND status IN ('waiting','active')`).run(class_id);
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const { lastInsertRowid } = db.prepare(
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`INSERT INTO live_sessions (class_id, teacher_id) VALUES (?,?)`
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).run(class_id, teacher.id);
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emitToClass(class_id, { type: 'live_started', liveId: lastInsertRowid, className: cls.name });
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res.json(db.prepare('SELECT * FROM live_sessions WHERE id=?').get(lastInsertRowid));
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}
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/* PUT /api/live/:id/question — teacher sets next question */
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function setQuestion(req, res) {
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const liveId = Number(req.params.id);
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const { question_id } = req.body;
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const teacher = req.user;
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const live = db.prepare('SELECT * FROM live_sessions WHERE id=?').get(liveId);
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if (!live) return res.status(404).json({ error: 'Not found' });
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if (live.teacher_id !== teacher.id && teacher.role !== 'admin')
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return res.status(403).json({ error: 'Forbidden' });
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db.prepare('DELETE FROM live_answers WHERE live_session_id=?').run(liveId);
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db.prepare(`UPDATE live_sessions SET question_id=?, status='active', show_results=0 WHERE id=?`)
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.run(question_id, liveId);
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const q = db.prepare(
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`SELECT q.id, q.text, q.type, q.difficulty, t.name AS topic
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FROM questions q LEFT JOIN topics t ON t.id=q.topic_id WHERE q.id=?`
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).get(question_id);
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const options = db.prepare(
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'SELECT id, text, order_index FROM options WHERE question_id=? ORDER BY order_index'
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).all(question_id);
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emitToClass(live.class_id, { type: 'live_question', liveId, question: { ...q, options } });
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res.json({ ok: true, question: { ...q, options } });
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}
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/* POST /api/live/:id/answer — student submits answer */
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function answer(req, res) {
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const liveId = Number(req.params.id);
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const { option_id, answer_text } = req.body;
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const userId = req.user.id;
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const live = db.prepare(`SELECT * FROM live_sessions WHERE id=? AND status='active'`).get(liveId);
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if (!live) return res.status(404).json({ error: 'Сессия не активна' });
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// Verify caller is a member of the class hosting this live session
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const isMember = db.prepare(
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'SELECT 1 FROM class_members WHERE class_id = ? AND user_id = ?'
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).get(live.class_id, userId);
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if (!isMember) return res.status(403).json({ error: 'Forbidden' });
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const existing = db.prepare(
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'SELECT id FROM live_answers WHERE live_session_id=? AND user_id=?'
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).get(liveId, userId);
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if (existing) return res.status(409).json({ error: 'Уже отвечено' });
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let is_correct = null;
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if (option_id) {
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const opt = db.prepare(
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'SELECT is_correct FROM options WHERE id=? AND question_id=?'
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).get(option_id, live.question_id);
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is_correct = opt ? opt.is_correct : 0;
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}
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db.prepare(
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`INSERT INTO live_answers (live_session_id, user_id, option_id, answer_text, is_correct)
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VALUES (?,?,?,?,?)`
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).run(liveId, userId, option_id || null, answer_text || null, is_correct);
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const { c: count } = db.prepare(
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'SELECT COUNT(*) AS c FROM live_answers WHERE live_session_id=?'
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).get(liveId);
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emit(live.teacher_id, { type: 'live_answer_count', liveId, count });
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res.json({ ok: true, is_correct });
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}
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/* GET /api/live/:id/results — teacher reveals & gets results */
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function results(req, res) {
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const liveId = Number(req.params.id);
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const teacher = req.user;
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const live = db.prepare('SELECT * FROM live_sessions WHERE id=?').get(liveId);
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if (!live) return res.status(404).json({ error: 'Not found' });
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if (live.teacher_id !== teacher.id && teacher.role !== 'admin')
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return res.status(403).json({ error: 'Forbidden' });
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const question = db.prepare(
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'SELECT id, text, explanation FROM questions WHERE id=?'
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).get(live.question_id);
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const options = db.prepare(`
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SELECT o.id, o.text, o.is_correct,
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COUNT(la.id) AS chosen_count
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FROM options o
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LEFT JOIN live_answers la ON la.option_id=o.id AND la.live_session_id=?
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WHERE o.question_id=?
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GROUP BY o.id ORDER BY o.order_index
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`).all(liveId, live.question_id);
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const stats = db.prepare(
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`SELECT COUNT(*) AS total, SUM(is_correct) AS correct
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FROM live_answers WHERE live_session_id=?`
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).get(liveId);
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db.prepare('UPDATE live_sessions SET show_results=1 WHERE id=?').run(liveId);
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emitToClass(live.class_id, { type: 'live_results', liveId, question, options, stats });
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res.json({ question, options, stats });
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}
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/* DELETE /api/live/:id — teacher ends session */
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function end(req, res) {
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const liveId = Number(req.params.id);
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const teacher = req.user;
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const live = db.prepare('SELECT * FROM live_sessions WHERE id=?').get(liveId);
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if (!live) return res.status(404).json({ error: 'Not found' });
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if (live.teacher_id !== teacher.id && teacher.role !== 'admin')
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return res.status(403).json({ error: 'Forbidden' });
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db.prepare(`UPDATE live_sessions SET status='finished', ended_at=datetime('now') WHERE id=?`).run(liveId);
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emitToClass(live.class_id, { type: 'live_ended', liveId });
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res.json({ ok: true });
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}
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/* GET /api/live/class/:classId/active — student polls active session */
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function getActive(req, res) {
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const classId = Number(req.params.classId);
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// Only class members (or teachers/admins) may poll
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if (!['teacher', 'admin'].includes(req.user.role)) {
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const isMember = db.prepare(
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'SELECT 1 FROM class_members WHERE class_id = ? AND user_id = ?'
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).get(classId, req.user.id);
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if (!isMember) return res.status(403).json({ error: 'Forbidden' });
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}
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const live = db.prepare(`
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SELECT * FROM live_sessions WHERE class_id=? AND status IN ('waiting','active')
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ORDER BY id DESC LIMIT 1
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`).get(classId);
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if (!live) return res.json({ active: false });
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let question = null, options = null, myAnswer = null;
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if (live.question_id && live.status === 'active') {
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question = db.prepare('SELECT id, text, type FROM questions WHERE id=?').get(live.question_id);
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options = db.prepare(
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'SELECT id, text, order_index FROM options WHERE question_id=? ORDER BY order_index'
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).all(live.question_id);
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myAnswer = db.prepare(
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'SELECT option_id, is_correct FROM live_answers WHERE live_session_id=? AND user_id=?'
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).get(live.id, req.user.id);
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}
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res.json({ active: true, live, question, options, myAnswer, showResults: live.show_results });
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}
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/* GET /api/live/:id — get session info (teacher) */
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function getSession(req, res) {
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const liveId = Number(req.params.id);
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const teacher = req.user;
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const live = db.prepare('SELECT * FROM live_sessions WHERE id=?').get(liveId);
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if (!live) return res.status(404).json({ error: 'Not found' });
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if (live.teacher_id !== teacher.id && teacher.role !== 'admin')
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return res.status(403).json({ error: 'Forbidden' });
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const answerCount = db.prepare(
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'SELECT COUNT(*) AS c FROM live_answers WHERE live_session_id=?'
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).get(liveId).c;
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const memberCount = db.prepare(
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'SELECT COUNT(*) AS c FROM class_members WHERE class_id=?'
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).get(live.class_id).c;
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res.json({ ...live, answerCount, memberCount });
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}
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module.exports = { create, setQuestion, answer, results, end, getActive, getSession };
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