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server.js
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server.js
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var jsonServer = require('json-server')
var express = require('express');
var bodyParser = require('body-parser')
var low = require('lowdb');
var jwt = require('jsonwebtoken');
var db = low('users.json');
var server = express();
var secret = '12312';
var restrictAccess = { //select restricted entities and methods for user role
posts: ['POST', 'PUT', 'DELETE'],
tags: ['GET','POST', 'PUT', 'DELETE']
};
var authenticatedRoutes = ['posts', 'tags', 'comments'];
server.use( bodyParser.json() );
server.post('/login', function(req, res) {
var userName = req.body._username;
var pass = req.body._password;
var user =
db('users')
.find({
"user" : userName,
"pass": pass
});
if (!user) {
res.status(401).json({
code: 401,
message: "Bad credentials"
});
} else {
var token = jwt.sign({role: user.role}, secret, {
expiresInMinutes: 60,
});
res.json({
"token": token,
"message": "Authenticated successfully"
});
}
});
server.use(function(req, res, next){
var authRequired = false;
authenticatedRoutes.forEach(function(route) {
if (req.originalUrl.indexOf(route) != -1) {
authRequired = true;
}
});
if (!authRequired) {
next();
return;
}
var token = req.headers['authorization'];
if (token) {
token = token.replace('Bearer ', '')
}
jwt.verify(token, secret, function(err, decoded) {
if (err) {
return res.status(401).json({ success: false, message: 'Failed to authenticate token.' });
} else {
if (decoded.role == 'user') {
for (var key in restrictAccess) {
if (restrictAccess.hasOwnProperty(key)) {
if (req.originalUrl.indexOf(key) != -1) {
return res.status(403).json({ success: false, message: 'Access denied.' });
}
}
}
}
req.decoded = decoded;
next();
}
});
});
server.use(jsonServer);
var fs = require('fs');
jsonServer.low.db = JSON.parse(fs.readFileSync('db.json', 'utf8'));
server.listen(3001);