3 files changed, 159 insertions, 0 deletions
diff --git a/backend/src/db.js b/backend/src/db.js
new file mode 100644
index 0000000..2573239
--- /dev/null
+++ b/backend/src/db.js
@@ -0,0 +1,4 @@
+const config = require('../knexfile')[process.env.NODE_ENV || 'development'];
+const knex = require('knex')(config);
+
+module.exports = knex;
diff --git a/backend/src/index.js b/backend/src/index.js
new file mode 100644
index 0000000..128ed60
--- /dev/null
+++ b/backend/src/index.js
@@ -0,0 +1,22 @@
+const express = require('express');
+const bodyParser = require('body-parser');
+const cookieParser = require('cookie-parser');
+const morgan = require('morgan');
+const routes = require('./routes');
+
+const app = express();
+
+app.use(morgan('dev'));
+app.use(bodyParser.json());
+app.use(cookieParser());
+app.use((req, res, next) => {
+  res.set('Access-Control-Allow-Origin', 'http://localhost:3000');
+  res.set('Access-Control-Allow-Headers', 'Content-Type');
+  res.set('Access-Control-Allow-Credentials', true);
+  next();
+});
+app.use(routes.normalRouter);
+app.use(routes.authedRouter);
+
+const port = 4000;
+app.listen(port, () => console.log(`App listening on http://localhost:${port}!`));
diff --git a/backend/src/routes.js b/backend/src/routes.js
new file mode 100644
index 0000000..a762d3a
--- /dev/null
+++ b/backend/src/routes.js
@@ -0,0 +1,133 @@
+const express = require('express');
+const sha512 = require('js-sha512');
+const shortid = require('shortid');
+
+const salt = 'suola';
+
+const db = require('./db');
+
+const buildSessionCookie = ({ sessionId, isLogout, remember }) => {
+  if (!isLogout) {
+    if (remember) {
+      return `sessionId=${sessionId}; Domain=localhost; HttpOnly; SameSite=strict;`;
+    } else {
+      return `sessionId=${sessionId}; Domain=localhost; HttpOnly; SameSite=strict; Max-Age=86400;`;
+    }
+  } else {
+    return `sessionId=deleted; Domain=localhost; Expires=Thu, 01 Jan 1970 00:00:00 GMT; HttpOnly; SameSite=strict;`;
+  }
+};
+
+const normalRouter = express.Router();
+const authedRouter = express.Router();
+
+authedRouter.use(async (req, res, next) => {
+  const cookies = req.cookies;
+  const { sessionId } = cookies;
+
+  if (!sessionId) {
+    res.status(403);
+    return res.json({
+      message: 'Log in first!',
+    });
+  }
+
+  const token = await db('tokens').where('value', sessionId).first();
+
+  if (!token) {
+    res.status(400);
+    res.set('Set-Cookie', buildSessionCookie({ isLogout: true }));
+    return res.json({
+      message: 'Invalid session token.',
+      sessionId,
+    });
+  }
+
+  const user = await db('users').where({ id: token.user_id }).first();
+
+  req.sessionId = sessionId;
+  req.user = user;
+
+  next();
+});
+
+normalRouter.get('/', (req, res) => {
+  res.json({
+    message: 'Backend API',
+  });
+});
+
+normalRouter.post('/register', async (req, res) => {
+  const { username, password } = req.body;
+  if (!username || !password) {
+    res.status(400);
+    return res.json({
+      error: 'Username or password missing.',
+    });
+  }
+
+  const existingUuser = await db('users').where({ username }).first();
+  if (existingUuser) {
+    res.status(400);
+    return res.json({
+      error: 'Username already taken.',
+    });
+  }
+
+  const pwHash = sha512(salt + password);
+  const sessionId = shortid.generate();
+  const user = (await db('users').insert({ username, password: pwHash }).returning('*'))[0];
+  await db('tokens').insert({ user_id: user.id, type: 'session', value: sessionId });
+
+  res.set('Set-Cookie', buildSessionCookie({ sessionId, remember: false, isLogout: false }));
+  return res.json({
+    username,
+  });
+});
+
+normalRouter.post('/login', async (req, res) => {
+  const { username, password, remember } = req.body;
+  if (!username || !password) {
+    res.status(400);
+    return res.json({
+      error: 'Username or password missing.',
+    });
+  }
+
+  const user = await db('users').where({ username }).first();
+
+  if (user) {
+    const sessionId = shortid.generate();
+    await db('tokens').insert({ user_id: user.id, type: 'session', value: sessionId });
+
+    res.set('Set-Cookie', buildSessionCookie({ sessionId, remember, isLogout: false }));
+
+    return res.json({
+      username,
+    });
+  }
+
+  res.status(403);
+  res.json({
+    error: 'Wrong username or password',
+  });
+});
+
+authedRouter.post('/logout', async (req, res) => {
+  if (req.user && req.sessionId) {
+    await db('tokens').where({ value: req.sessionId }).delete();
+  }
+  res.status(204);
+  res.set('Set-Cookie', buildSessionCookie({ isLogout: true }));
+  res.send();
+});
+
+authedRouter.get('/user', (req, res) => {
+  const user = req.user;
+  return res.json({
+    message: `Hello user ${user.username}!`,
+    username: user.username,
+  });
+});
+
+module.exports = { authedRouter, normalRouter };