feat: support guest session #8
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Summary of Changes
Hello @arvi18, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
I've implemented support for guest sessions, allowing users to interact with the application without needing to register or log in. This includes a new guest authentication flow, database integration for anonymous users, and UI adjustments to reflect guest status. Additionally, I've introduced a message rate-limiting system for the chat functionality, differentiating between guest and registered users to manage resource usage.
Highlights
- Guest Authentication Flow: A new API endpoint and NextAuth provider have been added to facilitate the creation and management of guest sessions, automatically generating anonymous user accounts in the database.
- Centralized Authentication Middleware: The application's middleware has been refactored to handle session management, automatically initiating guest sessions for unauthenticated users and redirecting logged-in users from authentication pages.
- Chat Message Rate Limiting: A new system is in place to limit the number of chat messages users can send per day, with different limits for guest users (20 messages) and registered users (100 messages), leveraging new database queries for message counting.
- Client-Side Session Management: The application now uses next-auth/react's SessionProvider to manage session state on the client, ensuring a consistent user experience across the application.
- User Interface Enhancements: The sidebar now dynamically displays "Guest" for anonymous users and adjusts the "Sign out" button to prompt guests to log in, along with a loading state for authentication status.
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🤖 Refacto.AI: PR Summary & Reviewer Guide🎯 1. The Goal (Why was this PR raised?)This PR implements guest session support, allowing users to interact with the application without requiring a full account registration. The implementation creates an anonymous user authentication flow and applies appropriate usage limitations for guest users. 🗺️ 2. The Changes (What was implemented?)
🤔 3. Key Areas for Human ReviewArea of Concern: Guest Authentication Flow
Area of Concern: Rate Limiting for Guest Users
Area of Concern: User Experience for Guest vs. Authenticated Users
Area of Concern: Anonymous User Creation
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/refacto-test |
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Refacto is reviewing this PR. Please wait for the review comments to be posted. |
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Code Review
This pull request introduces support for guest sessions, allowing users to use the application without creating an account. This is achieved by creating anonymous user accounts on the fly. The changes include a new API route for guest authentication, updates to the middleware to handle unauthenticated users, and rate limiting for guest and free users based on message count. The UI is also updated to reflect the guest user state. My review focuses on a potential race condition in anonymous user creation that could lead to errors, and a suggestion to improve the maintainability of the middleware configuration. Overall, the changes are well-implemented to support the new guest feature.
| export async function createAnonymousUser() { | ||
| const salt = genSaltSync(10); | ||
| const hash = hashSync(generateUUID(), salt); | ||
| const email = `anonymous-${Date.now()}`; |
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Using Date.now() to generate a unique email for anonymous users can lead to a race condition. If two users attempt to create a guest session at the exact same millisecond, it could cause a unique constraint violation in your database, as the generated emails would be identical. A more robust approach is to use a universally unique identifier (UUID) to guarantee uniqueness. You can use the generateUUID function which is already imported in this file.
Note that if you make this change, you will also need to update anonymousRegex in lib/constants.ts to match the new email format.
| const email = `anonymous-${Date.now()}`; | |
| const email = `anonymous-${generateUUID()}`; |
| @@ -5,3 +5,5 @@ export const isTestEnvironment = Boolean( | |||
| process.env.PLAYWRIGHT || | |||
| process.env.CI_PLAYWRIGHT, | |||
| ); | |||
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| export const anonymousRegex = /^anonymous-\d+$/; | |||
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This regular expression is designed to match anonymous user emails created with Date.now(). This is coupled with the user creation logic in lib/db/queries.ts. If you update the email generation to use UUIDs for better uniqueness (as suggested in a separate comment), this regex will no longer match and will need to be updated.
A simple update could be to match any characters after anonymous-, or you could use a more specific regex for UUIDs.
| export const anonymousRegex = /^anonymous-\d+$/; | |
| export const anonymousRegex = /^anonymous-.+/; |
| export const config = { | ||
| matcher: ['/', '/:id', '/api/:path*', '/login', '/register'], | ||
| matcher: [ | ||
| '/', | ||
| '/chat/:id', | ||
| '/api/:path*', | ||
| '/login', | ||
| '/register', | ||
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| /* | ||
| * Match all request paths except for the ones starting with: | ||
| * - _next/static (static files) | ||
| * - _next/image (image optimization files) | ||
| * - favicon.ico, sitemap.xml, robots.txt (metadata files) | ||
| */ | ||
| '/((?!_next/static|_next/image|favicon.ico|sitemap.xml|robots.txt).*)', | ||
| ], | ||
| }; |
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The matcher configuration contains redundant paths. The paths '/', '/chat/:id', '/api/:path*', '/login', '/register' are already covered by the general-purpose matcher on line 47. This redundancy can make the configuration harder to read and maintain. You can simplify this by removing the explicit, redundant paths.
export const config = {
matcher: [
/*
* Match all request paths except for the ones starting with:
* - _next/static (static files)
* - _next/image (image optimization files)
* - favicon.ico, sitemap.xml, robots.txt (metadata files)
*/
'/((?!_next/static|_next/image|favicon.ico|sitemap.xml|robots.txt).*)',
],
};
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/refacto-test |
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Refacto is reviewing this PR. Please wait for the review comments to be posted. |
Solid Implementation - Let's Address Key Security & Reliability Items!
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![refacto-test[bot]](https://avatars.githubusercontent.com/u/196302493?s=60&v=4){kind=small}
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| const session = await auth(); | ||
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| if (!session || !session.user || !session.user.id) { | ||
| if (!session?.user?.id) { | ||
| return new Response('Unauthorized', { status: 401 }); | ||
| } | ||
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| const membershipTier: MembershipTier = anonymousRegex.test( | ||
| session.user.email ?? '', | ||
| ) | ||
| ? 'guest' | ||
| : 'free'; | ||
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| const messageCount = await getMessageCountByUserId({ | ||
| id: session.user.id, | ||
| differenceInHours: 24, | ||
| }); | ||
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| if ( | ||
| messageCount > | ||
| entitlementsByMembershipTier[membershipTier].maxMessagesPerDay | ||
| ) { | ||
| return new Response( | ||
| 'You have exceeded your maximum number of messages for the day', | ||
| { | ||
| status: 429, | ||
| }, |
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Insufficient Rate Limiting for Guest Users
The PR implements rate limiting based on message count per user ID, but lacks IP-based rate limiting for guest account creation. An attacker could create unlimited anonymous accounts (each with its own message quota) by repeatedly calling the guest authentication endpoint, effectively bypassing the per-user message limit and potentially causing a denial of service.
| const session = await auth(); | |
| if (!session || !session.user || !session.user.id) { | |
| if (!session?.user?.id) { | |
| return new Response('Unauthorized', { status: 401 }); | |
| } | |
| const membershipTier: MembershipTier = anonymousRegex.test( | |
| session.user.email ?? '', | |
| ) | |
| ? 'guest' | |
| : 'free'; | |
| const messageCount = await getMessageCountByUserId({ | |
| id: session.user.id, | |
| differenceInHours: 24, | |
| }); | |
| if ( | |
| messageCount > | |
| entitlementsByMembershipTier[membershipTier].maxMessagesPerDay | |
| ) { | |
| return new Response( | |
| 'You have exceeded your maximum number of messages for the day', | |
| { | |
| status: 429, | |
| }, | |
| // Add this to app/(auth)/api/auth/guest/route.ts after the imports | |
| import { rateLimit } from '@/lib/rate-limit'; | |
| // Add this before the GET function | |
| const limiter = rateLimit({ | |
| interval: 60 * 60 * 1000, // 1 hour | |
| uniqueTokenPerInterval: 500, // Max 500 users per hour | |
| }); |
Standard: CWE-770
Standard: OWASP Top 10 2021: A04 - Insecure Design
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Note Other AI code review bot(s) detectedCodeRabbit has detected other AI code review bot(s) in this pull request and will avoid duplicating their findings in the review comments. This may lead to a less comprehensive review. WalkthroughThis update introduces guest authentication by adding guest sign-in logic, anonymous user creation, and related session management. It implements rate-limiting based on user tier, expands entitlements, and refactors authentication and middleware flows. UI components and session providers are updated to support guest users, with new constants and database queries supporting these changes. Changes
Sequence Diagram(s)sequenceDiagram
participant User
participant Middleware
participant GuestAuthAPI
participant DB
participant App
User->>Middleware: Request protected page
Middleware->>Middleware: Check session
alt No session
Middleware->>User: Redirect to /api/auth/guest
User->>GuestAuthAPI: GET /api/auth/guest
GuestAuthAPI->>DB: createAnonymousUser()
DB-->>GuestAuthAPI: Anonymous user object
GuestAuthAPI->>User: Redirect to /
User->>Middleware: Request protected page (as guest)
else Session exists
Middleware->>User: Proceed or redirect if needed
end
User->>App: Load page with session context
sequenceDiagram
participant User
participant App
participant ChatAPI
participant DB
User->>App: Send chat message
App->>ChatAPI: POST /api/chat
ChatAPI->>DB: getMessageCountByUserId()
DB-->>ChatAPI: Message count
alt Over limit
ChatAPI->>User: 429 Too Many Requests
else Under limit
ChatAPI->>DB: Save message
DB-->>ChatAPI: Message saved
ChatAPI->>User: Response with message
end
Estimated code review effort🎯 4 (Complex) | ⏱️ ~40 minutes Poem
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Actionable comments posted: 2
♻️ Duplicate comments (4)
lib/constants.ts (1)
9-9: Consider the coupling concern raised in the previous review.The regex pattern assumes anonymous emails use
Date.now()(digits only) for the suffix, creating tight coupling with user creation logic. As mentioned in the previous review, if email generation changes to UUIDs, this regex will need updating.app/(chat)/api/chat/route.ts (1)
47-75: Guest account creation still lacks IP-based rate limiting.While this implementation correctly limits messages per authenticated user (including guests), it doesn't address the core security concern: unlimited guest account creation. An attacker can still bypass the per-user message limit by repeatedly creating new anonymous accounts through the guest authentication endpoint.
The previous review comment about adding IP-based rate limiting to the guest authentication endpoint (
app/(auth)/api/auth/guest/route.ts) remains valid and should be addressed to prevent abuse.lib/db/queries.ts (1)
63-77: Race condition: Use UUID instead of timestamp for anonymous email generationUsing
Date.now()to generate unique emails can cause race conditions when multiple users create guest sessions simultaneously, potentially leading to unique constraint violations.- const email = `anonymous-${Date.now()}`; + const email = `anonymous-${generateUUID()}`;Note: If you make this change, update
anonymousRegexinlib/constants.tsto match UUIDs instead of numeric patterns.middleware.ts (1)
33-49: Redundant paths in matcher configurationThe specific paths on lines 35-39 are already covered by the catch-all pattern on line 47, creating unnecessary redundancy.
export const config = { matcher: [ - '/', - '/chat/:id', - '/api/:path*', - '/login', - '/register', - /* * Match all request paths except for the ones starting with: * - _next/static (static files) * - _next/image (image optimization files) * - favicon.ico, sitemap.xml, robots.txt (metadata files) */ '/((?!_next/static|_next/image|favicon.ico|sitemap.xml|robots.txt).*)', ], };
🧹 Nitpick comments (2)
components/sidebar-user-nav.tsx (1)
60-61: Consider edge case handling for user email.While the guest detection logic is sound, consider what happens if
user?.emailis undefined for non-guest users. The current fallback to showing the email might display "undefined" in the UI.- {isGuest ? 'Guest' : user?.email} + {isGuest ? 'Guest' : user?.email ?? 'User'}lib/ai/capabilities.ts (1)
14-33: Consider differentiating chat models between tiersBoth guest and free tiers have access to the same chat models. Consider limiting guest users to basic models to incentivize account creation.
guest: { maxMessagesPerDay: 20, - chatModelsAvailable: ['chat-model', 'chat-model-reasoning'], + chatModelsAvailable: ['chat-model'], },Would you like me to help implement the paid tier configuration mentioned in the TODO?
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📒 Files selected for processing (13)
app/(auth)/api/auth/guest/route.ts(1 hunks)app/(auth)/auth.config.ts(1 hunks)app/(auth)/auth.ts(2 hunks)app/(auth)/login/page.tsx(3 hunks)app/(auth)/register/page.tsx(3 hunks)app/(chat)/api/chat/route.ts(4 hunks)app/layout.tsx(2 hunks)components/sidebar-user-nav.tsx(3 hunks)lib/ai/capabilities.ts(1 hunks)lib/ai/models.ts(1 hunks)lib/constants.ts(1 hunks)lib/db/queries.ts(4 hunks)middleware.ts(1 hunks)
🧰 Additional context used
🧬 Code Graph Analysis (5)
app/(auth)/auth.ts (2)
lib/db/schema.ts (1)
user(14-18)lib/db/queries.ts (2)
getUser(42-49)createAnonymousUser(63-77)
app/(chat)/api/chat/route.ts (4)
app/(auth)/auth.ts (1)
session(53-65)lib/ai/capabilities.ts (2)
MembershipTier(3-3)entitlementsByMembershipTier(10-33)lib/constants.ts (1)
anonymousRegex(9-9)lib/db/queries.ts (1)
getMessageCountByUserId(437-462)
app/(auth)/api/auth/guest/route.ts (1)
app/(auth)/auth.ts (1)
session(53-65)
lib/ai/capabilities.ts (1)
lib/ai/models.ts (1)
ChatModel(3-7)
middleware.ts (1)
lib/constants.ts (1)
anonymousRegex(9-9)
🔇 Additional comments (17)
lib/ai/models.ts (1)
3-7: LGTM! Good architectural improvement.Exporting the
ChatModelinterface enables its reuse across modules for user entitlements and membership tiers, promoting better type consistency across the application.app/(auth)/login/page.tsx (2)
12-12: LGTM! Proper session management implementation.Adding the
useSessionimport supports the session update functionality needed for the guest session feature.Also applies to: 27-27
42-42: LGTM! Ensures session state consistency.Calling
updateSession()beforerouter.refresh()ensures the authentication session is immediately updated after successful login, maintaining consistent session state across the application.app/(auth)/register/page.tsx (2)
12-12: LGTM! Consistent session management pattern.Adding the
useSessionimport aligns with the login page implementation and supports the broader session management improvements.Also applies to: 27-27
43-43: LGTM! Maintains consistency with login flow.The
updateSession()call after successful registration matches the pattern used in the login page, ensuring consistent session state management across authentication flows.app/layout.tsx (2)
7-7: LGTM! Essential import for session management.Adding the
SessionProviderimport enables session context throughout the application, which is crucial for the guest session functionality.
81-81: LGTM! Proper session context setup.Wrapping the children with
SessionProviderin the root layout ensures session context is available throughout the entire application, enabling the guest session functionality and consistent session management across all components.app/(chat)/api/chat/route.ts (2)
54-58: LGTM! Membership tier determination is correctly implemented.The logic properly identifies guest users using the
anonymousRegexpattern and defaults to 'free' tier for regular users.
60-75: Rate limiting implementation is well-structured.The message count check properly enforces daily limits based on membership tier. The error message is clear and the HTTP 429 status code is appropriate for rate limiting.
app/(auth)/auth.config.ts (1)
12-12: Authorization logic validated—no changes neededAll previously covered scenarios by the
authorizedcallback are now handled:
- Middleware (
middleware.ts) protects/,/chat/:id,/api/:path*,/login,/register:
- Redirects unauthenticated requests to
/api/auth/guest(guest sign-in).- Redirects logged-in, non-anonymous users away from
/loginand/registerto/.- Page-level guards enforce chat visibility:
- Private chats in
app/(chat)/chat/[id]/page.tsxreturnnotFound()for unauthenticated users.- API routes under
app/(chat)/api/**all callauth()and return401or error responses whensession?.useris missing.The empty
callbacks: {}inauth.config.tsis safe—authorization is uniformly enforced elsewhere.app/(auth)/auth.ts (2)
24-34: Excellent defensive programming improvements.The refactored credentials provider properly handles edge cases with explicit null checks for both user existence and password presence. The destructuring approach is cleaner and the removal of type assertions makes the code safer.
36-43: Clean implementation of guest authentication provider.The guest credentials provider is well-implemented with a clear purpose and proper integration with the
createAnonymousUserfunction. The destructuring pattern is consistent with the main credentials provider.components/sidebar-user-nav.tsx (2)
38-49: Excellent loading state implementation with accessibility considerations.The loading state provides clear visual feedback with pulsing animations and a spinner. The use of
text-transparentwithanimate-pulsefor the text placeholder is a nice touch that maintains layout stability.
82-99: Smart context-aware sign-out behavior.The sign-out logic properly handles three distinct states:
- Loading state with helpful error message
- Guest users redirected to login (appropriate UX)
- Regular users signed out normally
This provides a much better user experience than a one-size-fits-all approach.
lib/db/queries.ts (1)
437-462: LGTM!The implementation correctly counts messages within a configurable time window with proper error handling and null-safe returns.
lib/ai/capabilities.ts (1)
1-8: Well-structured type definitionsGood use of TypeScript types and interfaces for defining membership tiers and their entitlements.
middleware.ts (1)
5-31: Well-implemented authentication flowThe middleware correctly handles:
- Infinite loop prevention for guest auth endpoint
- Guest session creation for unauthenticated users
- Proper redirects for authenticated users
Summary by CodeRabbit
New Features
Improvements
Bug Fixes