Enhance session management with improved error handling and secure cookie settings; update Next.js config for proxy trust

lib/session.ts

@@ -3,6 +3,11 @@ import { cookies } from 'next/headers';
 import { NextRequest } from 'next/server';
 
 const secretKey = process.env.NEXTAUTH_SECRET;
+
+if (!secretKey) {
+	throw new Error('NEXTAUTH_SECRET environment variable is not set');
+}
+
 const encodedKey = new TextEncoder().encode(secretKey);
 
 export interface SessionPayload {
@@ -27,17 +32,31 @@ export async function encrypt(payload: SessionPayload) {
 
 export async function decrypt(session: string | undefined = '') {
 	try {
+		if (!session) {
+			console.log('Failed to verify session: No session provided');
+			return null;
+		}
+
 		const { payload } = await jwtVerify(session, encodedKey, {
 			algorithms: ['HS256'],
 		});
-		return {
+		
+		const sessionData = {
 			userId: payload.userId as string,
 			email: payload.email as string,
 			role: payload.role as 'user' | 'admin',
 			expiresAt: new Date(payload.expiresAt as number),
 		};
+
+		// Check if session is expired
+		if (sessionData.expiresAt < new Date()) {
+			console.log('Failed to verify session: Session expired');
+			return null;
+		}
+
+		return sessionData;
 	} catch (error) {
-		console.log('Failed to verify session');
+		console.log('Failed to verify session:', error instanceof Error ? error.message : 'Unknown error');
 		return null;
 	}
 }
@@ -47,9 +66,16 @@ export async function createSession(payload: Omit<SessionPayload, 'expiresAt'>)
 	const session = await encrypt({ ...payload, expiresAt });
 
 	const cookieStore = await cookies();
+	
+	// In production, always use secure cookies if NEXTAUTH_URL is https
+	// This handles Cloudflare tunnel scenarios where external URL is https
+	// but internal communication is http
+	const isSecure = process.env.NODE_ENV === 'production' && 
+		process.env.NEXTAUTH_URL?.startsWith('https');
+	
 	cookieStore.set('session', session, {
 		httpOnly: true,
-		secure: process.env.NODE_ENV === 'production' && process.env.NEXTAUTH_URL?.startsWith('https'),
+		secure: isSecure,
 		expires: expiresAt,
 		sameSite: 'lax',
 		path: '/',
@@ -68,9 +94,13 @@ export async function updateSession() {
 	const expires = new Date(Date.now() + 7 * 24 * 60 * 60 * 1000);
 	const newSession = await encrypt({ ...payload, expiresAt: expires });
 
+	// In production, always use secure cookies if NEXTAUTH_URL is https
+	const isSecure = process.env.NODE_ENV === 'production' && 
+		process.env.NEXTAUTH_URL?.startsWith('https');
+
 	cookieStore.set('session', newSession, {
 		httpOnly: true,
-		secure: process.env.NODE_ENV === 'production' && process.env.NEXTAUTH_URL?.startsWith('https'),
+		secure: isSecure,
 		expires: expires,
 		sameSite: 'lax',
 		path: '/',