feat: add db-backed session cookie auth compatibility

backend/controllers/auth.controller.js

@@ -2,6 +2,10 @@ const bcrypt = require("bcryptjs");
 const jwt = require("jsonwebtoken");
 const User = require("../models/user.model");
 const { sendError } = require("../utils/http");
+const Session = require("../models/session.model");
+const { parseCookieHeader } = require("../utils/cookies");
+const { setSessionCookie, clearSessionCookie, cookieName } = require("../utils/session-cookie");
+const { logError } = require("../utils/logger");
 
 exports.register = async (req, res) => {
   let { username, password, name } = req.body;
@@ -15,6 +19,7 @@ exports.register = async (req, res) => {
 
     res.json({ message: "User registered", user });
   } catch (err) {
+    logError(req, "auth.register", err);
     sendError(res, 400, "Registration failed");
   }
 };
@@ -41,5 +46,30 @@ exports.login = async (req, res) => {
     { expiresIn: "1 year" }
   );
 
+  try {
+    const session = await Session.createSession(user.id, req.headers["user-agent"] || null);
+    setSessionCookie(res, session.id);
+  } catch (err) {
+    logError(req, "auth.login.createSession", err);
+    return sendError(res, 500, "Failed to create session");
+  }
+
   res.json({ token, userId: user.id, username, role: user.role });
 };
+
+exports.logout = async (req, res) => {
+  try {
+    const cookies = parseCookieHeader(req.headers.cookie);
+    const sid = cookies[cookieName()];
+
+    if (sid) {
+      await Session.deleteSession(sid);
+    }
+
+    clearSessionCookie(res);
+    res.json({ message: "Logged out" });
+  } catch (err) {
+    logError(req, "auth.logout", err);
+    sendError(res, 500, "Failed to logout");
+  }
+};

backend/middleware/auth.js

@@ -1,19 +1,48 @@
 const jwt = require("jsonwebtoken");
 const { sendError } = require("../utils/http");
+const Session = require("../models/session.model");
+const { parseCookieHeader } = require("../utils/cookies");
+const { cookieName } = require("../utils/session-cookie");
+const { logError } = require("../utils/logger");
 
-function auth(req, res, next) {
-  const header = req.headers.authorization;
-  if (!header) return sendError(res, 401, "Missing token");
+async function auth(req, res, next) {
+  const header = req.headers.authorization || "";
+  const token = header.startsWith("Bearer ") ? header.slice(7).trim() : null;
 
-  const token = header.split(" ")[1];
-  if (!token) return sendError(res, 401, "Invalid token format");
+  if (token) {
+    try {
+      const decoded = jwt.verify(token, process.env.JWT_SECRET);
+      req.user = decoded; // id + role
+      return next();
+    } catch (err) {
+      return sendError(res, 401, "Invalid or expired token");
+    }
+  }
 
   try {
-    const decoded = jwt.verify(token, process.env.JWT_SECRET);
-    req.user = decoded; // id + role
-    next();
+    const cookies = parseCookieHeader(req.headers.cookie);
+    const sid = cookies[cookieName()];
+
+    if (!sid) {
+      return sendError(res, 401, "Missing authentication");
+    }
+
+    const session = await Session.getActiveSessionWithUser(sid);
+    if (!session) {
+      return sendError(res, 401, "Invalid or expired session");
+    }
+
+    req.user = {
+      id: session.user_id,
+      role: session.role,
+      username: session.username,
+    };
+    req.session_id = session.id;
+
+    return next();
   } catch (err) {
-    sendError(res, 401, "Invalid or expired token");
+    logError(req, "middleware.auth", err);
+    return sendError(res, 500, "Authentication check failed");
   }
 }
 

backend/models/session.model.js

@@ -0,0 +1,56 @@
+const crypto = require("crypto");
+const pool = require("../db/pool");
+const { SESSION_TTL_DAYS } = require("../utils/session-cookie");
+
+function generateSessionId() {
+  if (typeof crypto.randomUUID === "function") {
+    return crypto.randomUUID().replace(/-/g, "") + crypto.randomBytes(8).toString("hex");
+  }
+  return crypto.randomBytes(32).toString("hex");
+}
+
+exports.createSession = async (userId, userAgent = null) => {
+  const id = generateSessionId();
+  const result = await pool.query(
+    `INSERT INTO sessions (id, user_id, expires_at, user_agent)
+     VALUES ($1, $2, NOW() + ($3 || ' days')::interval, $4)
+     RETURNING id, user_id, created_at, expires_at`,
+    [id, userId, String(SESSION_TTL_DAYS), userAgent]
+  );
+  return result.rows[0];
+};
+
+exports.getActiveSessionWithUser = async (sessionId) => {
+  const result = await pool.query(
+    `SELECT
+      s.id,
+      s.user_id,
+      s.expires_at,
+      u.username,
+      u.role
+    FROM sessions s
+    JOIN users u ON u.id = s.user_id
+    WHERE s.id = $1
+      AND s.expires_at > NOW()`,
+    [sessionId]
+  );
+
+  const session = result.rows[0] || null;
+  if (!session) return null;
+
+  await pool.query(
+    `UPDATE sessions
+     SET last_seen_at = NOW()
+     WHERE id = $1`,
+    [sessionId]
+  );
+
+  return session;
+};
+
+exports.deleteSession = async (sessionId) => {
+  await pool.query(
+    `DELETE FROM sessions WHERE id = $1`,
+    [sessionId]
+  );
+};

backend/routes/auth.routes.js

@@ -4,6 +4,7 @@ const User = require("../models/user.model");
 
 router.post("/register", controller.register);
 router.post("/login", controller.login);
+router.post("/logout", controller.logout);
 router.post("/", async (req, res) => {
   res.status(200).json({
     message: "Auth API is running.",

backend/utils/cookies.js

@@ -0,0 +1,20 @@
+function parseCookieHeader(cookieHeader) {
+  const cookies = {};
+  if (!cookieHeader || typeof cookieHeader !== "string") return cookies;
+
+  const segments = cookieHeader.split(";");
+  for (const segment of segments) {
+    const index = segment.indexOf("=");
+    if (index === -1) continue;
+    const key = segment.slice(0, index).trim();
+    const value = segment.slice(index + 1).trim();
+    if (!key) continue;
+    cookies[key] = decodeURIComponent(value);
+  }
+
+  return cookies;
+}
+
+module.exports = {
+  parseCookieHeader,
+};

backend/utils/session-cookie.js

@@ -0,0 +1,36 @@
+const SESSION_COOKIE_NAME = process.env.SESSION_COOKIE_NAME || "sid";
+const SESSION_TTL_DAYS = Number(process.env.SESSION_TTL_DAYS || 30);
+
+function sessionMaxAgeMs() {
+  return SESSION_TTL_DAYS * 24 * 60 * 60 * 1000;
+}
+
+function cookieName() {
+  return SESSION_COOKIE_NAME;
+}
+
+function setSessionCookie(res, sessionId) {
+  res.cookie(cookieName(), sessionId, {
+    httpOnly: true,
+    secure: process.env.NODE_ENV === "production",
+    sameSite: "lax",
+    path: "/",
+    maxAge: sessionMaxAgeMs(),
+  });
+}
+
+function clearSessionCookie(res) {
+  res.clearCookie(cookieName(), {
+    httpOnly: true,
+    secure: process.env.NODE_ENV === "production",
+    sameSite: "lax",
+    path: "/",
+  });
+}
+
+module.exports = {
+  SESSION_TTL_DAYS,
+  clearSessionCookie,
+  cookieName,
+  setSessionCookie,
+};