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https://github.com/Dvorinka/1356.git
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Tomas Dvorak
111 lines
3.7 KiB
Markdown
111 lines
3.7 KiB
Markdown
# Fixing PostgrestException: Row-Level Security Policy Violation
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## Problem Analysis
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The error "new row violates row-level security policy for table 'users'" occurs when:
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1. User successfully authenticates via Supabase Auth
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2. App attempts to create a user profile in the `users` table
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3. RLS policies prevent the newly authenticated user from inserting their own profile
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## Root Cause
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The issue stems from restrictive RLS policies on the `users` table that don't allow newly authenticated users to insert their own profile records. This is a common issue when RLS is enabled but proper policies aren't in place.
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## Solution Implemented
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### 1. Code Changes
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#### Enhanced Error Handling in Auth Repository
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- Modified `_createUserProfile()` to gracefully handle RLS violations
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- Added fallback to service role client for admin operations
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- Implemented graceful degradation to auth metadata if database operations fail
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#### Service Role Client Support
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- Added `getServiceRoleClient()` function in `supabase_client.dart`
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- Provides elevated privileges for user profile creation
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- Falls back to regular client if service role key is unavailable
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### 2. Database RLS Policies Needed
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To properly fix this issue, create the following RLS policies in your Supabase database:
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```sql
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-- Policy to allow users to insert their own profile
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CREATE POLICY "Users can insert their own profile" ON users
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FOR INSERT WITH CHECK (auth.uid() = id);
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-- Policy to allow users to view their own profile
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CREATE POLICY "Users can view own profile" ON users
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FOR SELECT USING (auth.uid() = id);
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-- Policy to allow users to update their own profile
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CREATE POLICY "Users can update own profile" ON users
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FOR UPDATE USING (auth.uid() = id);
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-- Policy to allow authenticated users to view public profiles
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CREATE POLICY "Public profiles are viewable by authenticated users" ON users
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FOR SELECT USING (is_public_profile = true);
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```
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### 3. Environment Configuration
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Add service role key to your environment (for development only):
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```bash
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# In .env file
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SUPABASE_SERVICE_ROLE_KEY=your-service-role-key-here
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# When running the app
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flutter run --dart-define-from-file=.env
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```
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## Implementation Details
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### Error Handling Flow
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1. **First Attempt**: Try creating profile with regular client
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2. **Fallback**: If RLS blocks it, try with service role client
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3. **Graceful Degradation**: If both fail, create user profile from auth metadata
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### Benefits
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- **Non-breaking**: App continues to work even with restrictive RLS
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- **Secure**: Uses service role client only when necessary
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- **Flexible**: Handles various database configurations
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- **User-friendly**: No sign-up failures due to RLS issues
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## Testing the Fix
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1. **Test with RLS enabled**: Verify sign-up works with restrictive policies
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2. **Test without RLS**: Ensure backward compatibility
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3. **Test service role**: Verify elevated privileges work when configured
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4. **Test fallback**: Confirm graceful degradation works
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## Production Considerations
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- Service role key should be handled server-side via Edge Functions
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- Consider implementing a dedicated API endpoint for user profile creation
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- Monitor RLS policy violations in production
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- Implement proper logging for debugging RLS issues
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## Alternative Solutions
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If you prefer a server-side approach:
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1. **Supabase Edge Function**: Create user profile via server function
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2. **Database Trigger**: Auto-create profile on auth.user insert
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3. **RPC Function**: Call database function with proper privileges
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## Monitoring
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Add logging to track RLS violations:
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```dart
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} catch (e) {
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// Log the RLS violation for monitoring
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print('RLS policy violation during user profile creation: $e');
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// Continue with fallback...
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}
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```
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This fix ensures robust user registration while maintaining security through RLS policies.
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