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server.js
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server.js
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const express = require('express');
const bodyParser = require('body-parser');
const cors = require('cors');
const fs = require('fs');
const crypto = require('crypto');
const path = require('path');
const _ = require('lodash');
const { PORT = 8081, HOST = 'localhost' } = process.env;
const app = express();
app.listen(PORT, () => console.log(`app started at http://${HOST}:${PORT}`));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true, limit: '5mb' }));
app.use(cors());
const lessons = [];
const imgPath = path.resolve(__dirname, 'img');
if (!fs.existsSync(imgPath)) {
fs.mkdirSync(imgPath);
}
app.use('/img', express.static(imgPath));
const saveImage = dataURL => {
if (dataURL.indexOf('http') === 0) {
return dataURL;
}
const [head, body] = dataURL.split(',');
const [, ext = ''] = head.match(/^data:image\/(.+);base64$/) || [];
const hash = crypto
.createHash('md5')
.update(body)
.digest('hex');
const filename = `${hash}.${ext}`;
fs.writeFileSync(path.resolve(imgPath, filename), body, 'base64');
return `http://${HOST}:${PORT}/img/${filename}`;
};
app
.route('/')
.post((req, res) => {
const image = saveImage(req.body.image);
const data = _.omit(req.body, 'image');
const id = lessons.length;
const lesson = _.assign(data, { id, image });
lessons.push(lesson);
res.json({ id });
})
.get((req, res) => {
res.json(lessons);
});
app
.route('/:id')
.get((req, res) => {
res.json(lessons.find(n => n.id == req.params.id));
})
.put((req, res) => {
const image = saveImage(req.body.image);
const data = _.omit(req.body, 'image');
const id = req.params.id;
const lesson = _.find(lessons, { id });
if (!lesson) {
res.json({ success: false });
} else {
_.assign(lesson, data, { image });
res.json({ success: true });
}
});