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server.js
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server.js
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const fs = require('fs');
const path = require('path');
const bodyParser = require('body-parser');
const express = require('express');
const jwt = require('jsonwebtoken');
const expressJwt = require('express-jwt');
const _ = require('lodash');
const app = express();
const COMMENTS_FILE = path.join(__dirname, 'comments.json');
const POEMS_FILE = path.join(__dirname, 'poems.json');
const USERS_FILE = path.join(__dirname, 'users.json');
const SESSIONS_FILE = path.join(__dirname, 'sessions.json');
app.use('/', express.static(path.join(__dirname, 'client/public')));
app.use(bodyParser.json());
app.use('/api', expressJwt({ secret: 'secret' }));
app.post('/login', (req, res) => {
fs.readFile(USERS_FILE, (err, data) => {
if (err) {
console.error(err);
process.exit(1);
}
const users = JSON.parse(data);
const targetUser = users.filter((user) => user.username === req.body.username)[0];
if (!targetUser || targetUser.password !== req.body.password) {
res.status(401).send('Bad login');
return;
}
const token = jwt.sign(targetUser, 'secret', { expiresIn: '1h' });
res.json({ token });
});
});
const commentFilter = (poemId) => (comment) => comment.poemId === parseInt(poemId, 10);
app.get('/api/comments/:poemId', (req, res) => {
fs.readFile(COMMENTS_FILE, (err, data) => {
if (err) {
console.error(err);
process.exit(1);
}
const comments = JSON.parse(data);
const poemComments = comments.filter(commentFilter(req.params.poemId));
res.json(poemComments);
});
});
app.post('/api/comments/:poemId', (req, res) => {
fs.readFile(COMMENTS_FILE, (err, data) => {
if (err) {
console.error(err);
process.exit(1);
}
const comments = JSON.parse(data);
const newComment = {
id: Date.now(),
poemId: parseInt(req.params.poemId, 10),
author: req.body.author,
text: req.body.text,
};
comments.push(newComment);
fs.writeFile(COMMENTS_FILE, JSON.stringify(comments, null, 4), (writeErr) => {
if (writeErr) {
console.error(writeErr);
process.exit(1);
}
const poemComments = comments.filter(commentFilter(req.params.poemId));
res.json(poemComments);
});
});
});
app.get('/api/session', (req, res) => {
fs.readFile(SESSIONS_FILE, (err, data) => {
if (err) {
console.error(err);
process.exit(1);
}
res.json(JSON.parse(data));
});
});
const getSessionPoemSummaries = (poemIds, poems) =>
poemIds.map((poemId) => _.chain(poems)
.filter((poem) => poem.id === parseInt(poemId, 10))
.head()
.pick(['id', 'title', 'author'])
.value());
app.get('/api/session/active', (req, res) => {
fs.readFile(SESSIONS_FILE, (err, data) => {
if (err) {
console.error(err);
process.exit(1);
}
const activeSession = JSON.parse(data)[0];
fs.readFile(POEMS_FILE, (poemsErr, poemsData) => {
if (poemsErr) {
console.error(err);
process.exit(1);
}
const allPoems = JSON.parse(poemsData);
activeSession.poems = getSessionPoemSummaries(activeSession.poems, allPoems);
res.json(activeSession);
});
});
});
const startNewSession = (sessions, poems) => {
const activeSession = Object.assign(sessions[0]);
activeSession.status = 'CLOSED';
return [{
id: Date.now(),
startDate: Date.now(),
endDate: 0,
status: 'ACTIVE',
poems: poems || [],
}].concat(activeSession, sessions.slice(1));
};
app.put('/api/session/', (req, res) => {
fs.readFile(SESSIONS_FILE, (err, data) => {
if (err) {
console.error(err);
process.exit(1);
}
let sessions = JSON.parse(data);
const paramSession = req.body.session;
if (!paramSession.id) { // the previous session has been closed
sessions = startNewSession(sessions, paramSession.poems);
} else { // the only other supported update is poems added or reordered
sessions[0].poems = paramSession.poems;
}
fs.writeFile(SESSIONS_FILE, JSON.stringify(sessions, null, 4), (writeErr) => {
if (writeErr) {
console.error(writeErr);
process.exit(1);
}
res.json(sessions);
});
});
});
app.get('/api/poem', (req, res) => {
fs.readFile(POEMS_FILE, (err, data) => {
if (err) {
console.error(err);
process.exit(1);
}
res.json(JSON.parse(data));
});
});
app.get('/api/poem/:poemId', (req, res) => {
fs.readFile(POEMS_FILE, (err, data) => {
if (err) {
console.error(err);
process.exit(1);
}
const poems = JSON.parse(data);
const targetPoem = poems.filter((poem) => poem.id === parseInt(req.params.poemId, 10))[0];
res.json(targetPoem);
});
});
app.post('/api/poem', (req, res) => {
if (req.body.poems && Array.isArray(req.body.poems)) {
const poems = req.body.poems;
fs.writeFile(POEMS_FILE, JSON.stringify(poems, null, 4), (err) => {
if (err) {
console.error(err);
process.exit(1);
}
res.json(poems);
});
} else {
fs.readFile(POEMS_FILE, (err, data) => {
if (err) {
console.error(err);
process.exit(1);
}
const poems = JSON.parse(data);
const newPoem = {
id: Date.now(),
title: req.body.title,
author: req.body.author,
collection: req.body.collection,
text: req.body.text,
};
poems.push(newPoem);
fs.writeFile(POEMS_FILE, JSON.stringify(poems, null, 4), (writeErr) => {
if (writeErr) {
console.error(writeErr);
process.exit(1);
}
res.json(poems);
});
});
}
});
app.get('/*', (req, res) => {
res.sendFile(path.join(__dirname, './client/public/index.html'));
});
app.listen(3000, () => {
console.log('Server started and listening on port 3000!'); // eslint-disable-line no-console
});