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server.js
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server.js
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const { existsSync, readFile, writeFile } = require('fs');
const http = require('http');
const { resolve } = require('path');
const url = require('url');
const ROOT_PATH = resolve(__dirname, './');
const PUBLIC_PATH = `${ROOT_PATH}/public`;
const DEFAULT_MARKERS_PATH = `${PUBLIC_PATH}/markers.default.json`;
const USER_MARKERS_PATH = `${PUBLIC_PATH}/markers.json`;
let defaultMarkers;
const loadMarkers = (filePath) => new Promise((resolve, reject) => {
const promises = [];
if (existsSync(filePath)) {
readFile(filePath, (err, markers) => {
if (err) reject(err);
else resolve(JSON.parse(markers));
});
}
else resolve([]);
});
const saveMarkers = (markers) => new Promise((resolve, reject) => {
const jsonData = JSON.stringify(markers, null, 2);
writeFile(USER_MARKERS_PATH, jsonData, (err) => {
if (err) reject(err);
else resolve(jsonData);
});
});
const parseReq = (req) => new Promise((resolve, reject) => {
if (/^(DELETE|POST)$/i.test(req.method)) {
let body = '';
req.on('data', (data) => {
body += data;
});
req.on('end', () => {
resolve(JSON.parse(body));
});
}
});
const getMarkerById = (markers, uid) => {
let marker;
let ndx;
for (let i=0; i<markers.length; i++) {
if (markers[i].data.uid === uid) {
marker = markers[i];
ndx = i;
break;
}
}
return { marker, ndx };
};
const handleRequests = (req, res) => {
const {
pathname: urlPath,
} = url.parse(req.url);
// Static files
if (/^\/(css|js|imgs)\/.*/.test(urlPath)) {
const filePath = `${PUBLIC_PATH}${urlPath}`;
readFile(filePath, (err, file) => {
if (err) {
console.error('[ERROR]', err);
res.statusCode = 500;
res.statusMessage = err;
res.end();
}
else {
const etag = require('etag');
const mime = require('mime-types');
res.setHeader('Content-Type', mime.lookup(`${PUBLIC_PATH}${urlPath}`));
res.setHeader('ETag', etag(file));
if (filePath.includes('/imgs')) {
res.setHeader('Cache-Control', `max-age=${60 * 60 * 24 * 365}`);
}
res.end(file);
}
});
}
// API calls
else if (urlPath.startsWith('/api/marker')) {
const handleLoadError = (err) => {
console.log('[ERROR] Loading Markers', err);
res.statusCode = 500;
res.statusMessage = err;
res.end();
};
const handleSaveError = (err) => {
console.log('[ERROR] Saving Markers', err);
res.statusCode = 500;
res.statusMessage = err;
res.end();
};
const contentTypeJSON = ['Content-Type', 'application/json'];
if (urlPath.endsWith('/delete')) {
parseReq(req).then(({ uid }) => {
loadMarkers(USER_MARKERS_PATH)
.then((loadedMarkers) => {
const { marker, ndx } = getMarkerById(loadedMarkers, uid);
loadedMarkers.splice(ndx, 1);
saveMarkers(loadedMarkers)
.then((savedMarkers) => {
console.log('[DELETED] Marker', marker);
res.setHeader(...contentTypeJSON);
res.end(JSON.stringify([
...defaultMarkers,
...loadedMarkers,
]));
})
.catch(handleSaveError);
})
.catch(handleLoadError);
});
}
else if (urlPath.endsWith('/load-all')) {
loadMarkers(USER_MARKERS_PATH)
.then((loadedMarkers) => {
res.setHeader(...contentTypeJSON);
res.end(JSON.stringify([
...defaultMarkers,
...loadedMarkers,
]));
})
.catch(handleLoadError);
}
else if (urlPath.endsWith('/save')) {
parseReq(req).then((marker) => {
loadMarkers(USER_MARKERS_PATH)
.then((loadedMarkers) => {
const markers = loadedMarkers.reduce((arr, m) => {
if (m.data.uid !== marker.data.uid) arr.push(m);
return arr;
}, []);
markers.push(marker);
saveMarkers(markers)
.then((savedMarkers) => {
console.log('[SAVED] Marker', marker);
res.setHeader(...contentTypeJSON);
res.end(JSON.stringify([
...defaultMarkers,
...markers,
]));
})
.catch(handleSaveError);
})
.catch(handleLoadError);
});
}
else if (urlPath.endsWith('/update')) {
parseReq(req).then(({ data, uid }) => {
loadMarkers(USER_MARKERS_PATH)
.then((loadedMarkers) => {
const { marker, ndx } = getMarkerById(loadedMarkers, uid);
const updatedMarker = {
...marker,
...data,
};
loadedMarkers[ndx] = updatedMarker;
saveMarkers(loadedMarkers)
.then((savedMarkers) => {
console.log('[UPDATED] Marker', updatedMarker);
res.setHeader(...contentTypeJSON);
res.end(JSON.stringify([
...defaultMarkers,
...loadedMarkers,
]));
})
.catch(handleSaveError);
})
.catch(handleLoadError);
});
}
}
// Root document
else {
loadMarkers(DEFAULT_MARKERS_PATH)
.then((markers) => {
defaultMarkers = markers;
readFile(`${PUBLIC_PATH}/index.html`, (err, file) => {
if (err) console.error('[ERROR]', err);
else res.end(file);
});
})
.catch((err) => {
console.error('[ERROR]', err);
});
}
}
const SERVER_PORT = 3000;
const server = http.createServer(handleRequests);
server.listen(SERVER_PORT, (err) => {
if (err) console.error('[ERROR]', err);
else console.log(`Server running at http://localhost:${SERVER_PORT}`);
});