This document describes the authentication and security measures implemented for the admin panel.

• Sessions now expire after 1 hour of inactivity
• Session data is stored as a JSON object with an expiresAt timestamp
• On page load, expired sessions are automatically cleared
• Invalid session data is handled gracefully with error catching

• Username and password are validated together to prevent timing attacks
• Password comparison runs even if username is incorrect
• Single "Invalid credentials" error message for both username and password failures
• Prevents attackers from determining valid usernames through response timing

• Added proper TypeScript interfaces for Branch, Semester, and Subject types
• Replaced any[] types with strongly typed arrays
• Improves code maintainability and catches type errors at compile time

• Credit hours validation improved to handle edge cases:
  • Empty strings are properly handled as undefined
  • Non-numeric values are rejected
  • Negative numbers are rejected
• Form reload logic fixed to use correct ID variables

• Added null checks for all Supabase insert operations
• Throws descriptive errors if insert operations succeed but return no data
• Prevents undefined access errors

RLS policies have been updated to properly authenticate users using Supabase Auth:

Migration File: supabase/migrations/20251104152900_fix_rls_policies_for_admin_operations.sql

• All tables (branches, semesters, subjects, resources) allow SELECT operations for everyone
• This enables the view-only site to function without authentication

• INSERT, UPDATE, and DELETE operations require authentication
• Policies check auth.uid() IS NOT NULL to verify the user is authenticated with Supabase
• Unauthenticated requests to write operations will be rejected at the database level

1. Client authenticates with Supabase Auth (needs to be set up)
2. Supabase generates a JWT token containing the user ID
3. The JWT is sent with every database request
4. RLS policies check auth.uid() which extracts the user ID from the JWT
5. If no valid JWT is present, auth.uid() returns NULL and write operations fail

The following environment variables must be set:

• VITE_ADMIN_USERNAME: The admin username
• VITE_ADMIN_PASSWORD_HASH: BCrypt hash of the admin password

To fully enable authentication at the database level:

1. Apply the migration:

   supabase db push

2. Set up Supabase Auth (if not already done):

   • Enable Email/Password authentication in Supabase dashboard
   • Create an admin user account
   • Update the client code to use Supabase Auth instead of local authentication

3. Alternative: Service Role Key: If you prefer to keep local authentication:

   • Use Supabase service role key for admin operations
   • Update supabaseAcademicApi.ts to use service role client
   • Note: Service role bypasses RLS, so ensure proper client-side checks

1. Local Authentication Only: The current implementation uses local username/password authentication with bcrypt, which doesn't integrate with Supabase Auth.

2. No Server-Side Session Validation: Sessions are stored in localStorage without server-side validation.

3. Recommended Improvements:

   • Integrate with Supabase Auth for full end-to-end authentication
   • Implement refresh tokens for longer sessions
   • Add CSRF protection for write operations
   • Consider implementing role-based access control (RBAC) for different admin levels

You can test RLS policies using the Supabase SQL editor:

-- Test as unauthenticated user (should fail)
INSERT INTO branches (name, description) VALUES ('Test Branch', 'Test Description');

-- Test as authenticated user (should succeed)
SELECT auth.uid(); -- Check if you're authenticated
INSERT INTO branches (name, description) VALUES ('Test Branch', 'Test Description');

1. Never commit credentials: Use environment variables for all sensitive data
2. Use HTTPS: Always serve the application over HTTPS in production
3. Regular security audits: Review and update dependencies regularly
4. Monitor failed login attempts: Consider implementing rate limiting
5. Secure environment variables: Use Vercel/hosting platform's secret management