# Authorization System Implementation Summary

## ✅ Implementation Complete

A comprehensive polymorphic record sharing and authorization system has been implemented with CASL, Objection.js, and NestJS.

## What Was Built

### Backend (NestJS + Objection.js + CASL)

#### 1. Database Layer
- ✅ Migration for authorization tables (`20250128000001_add_authorization_system.js`)
- ✅ Updated Prisma schema with new models
- ✅ Objection.js models: `ObjectField`, `RoleRule`, `RecordShare`
- ✅ Updated existing models with new relations

#### 2. Authorization Core
- ✅ `AbilityFactory` - Builds CASL abilities from 3 layers (global, role, share)
- ✅ Query scoping utilities for SQL-level authorization
- ✅ Guards and decorators (`AbilitiesGuard`, `@CheckAbility()`, `@CurrentUser()`)
- ✅ Middleware for attaching abilities to requests

#### 3. API Endpoints
- ✅ **ShareController** - CRUD for record shares
  - POST /shares - Create share
  - GET /shares/record/:objectDefinitionId/:recordId - List shares
  - GET /shares/granted - Shares granted by user
  - GET /shares/received - Shares received by user
  - PATCH /shares/:id - Update share
  - DELETE /shares/:id - Revoke share

- ✅ **RoleController** - Role management
  - Standard CRUD for roles
  - RoleRuleController for CASL rules

- ✅ **ObjectAccessController** - Object-level permissions
  - GET/PUT /setup/objects/:apiName/access
  - POST /setup/objects/:apiName/fields/:fieldKey/permissions
  - PUT /setup/objects/:apiName/field-permissions

### Frontend (Nuxt 3 + Vue 3)

#### 4. Object Management Enhancement
- ✅ Added "Access & Permissions" tab to object setup page
- ✅ `ObjectAccessSettings.vue` component:
  - Configure access model (public/owner/mixed)
  - Set public CRUD permissions
  - Configure owner field
  - Set field-level read/write permissions

#### 5. Role Management
- ✅ New page: `/setup/roles`
- ✅ `RolePermissionsEditor.vue` component:
  - Configure CRUD permissions per object
  - Apply conditions (e.g., own records only)
  - Visual permission matrix

#### 6. Record Sharing
- ✅ `RecordShareDialog.vue` component:
  - List current shares
  - Add new shares with permissions
  - Field-level scoping
  - Expiration dates
  - Revoke shares

## Key Features

### 🌍 Global Object Policies
- Public/private access models
- Default CRUD permissions per object
- Configurable owner field
- Field-level default permissions

### 👥 Role-Based Access
- CASL rules stored in database
- Per-object permissions
- Condition-based rules (e.g., ownerId matching)
- Multiple actions per rule

### 🔗 Per-Record Sharing
- Polymorphic design (works with any object type)
- Grant read/update access to specific users
- Optional field-level scoping
- Expiration and revocation support
- Track who granted each share

### 🔒 SQL Query Scoping
- Critical for list endpoints
- Ensures users only see authorized records
- Combines ownership + sharing logic
- Works with public access flags

## File Structure

```
backend/
├── migrations/tenant/
│   └── 20250128000001_add_authorization_system.js
├── src/
│   ├── auth/
│   │   ├── ability.factory.ts (CASL ability builder)
│   │   ├── query-scope.util.ts (SQL scoping utilities)
│   │   ├── guards/
│   │   │   └── abilities.guard.ts
│   │   ├── decorators/
│   │   │   ├── auth.decorators.ts
│   │   │   └── check-ability.decorator.ts
│   │   └── middleware/
│   │       └── ability.middleware.ts
│   ├── models/
│   │   ├── object-field.model.ts
│   │   ├── role-rule.model.ts
│   │   └── record-share.model.ts
│   ├── rbac/
│   │   ├── share.controller.ts
│   │   └── role.controller.ts
│   └── object/
│       └── object-access.controller.ts

frontend/
├── components/
│   ├── ObjectAccessSettings.vue
│   ├── RecordShareDialog.vue
│   └── RolePermissionsEditor.vue
└── pages/
    ├── setup/
    │   ├── objects/[apiName].vue (enhanced with access tab)
    │   └── roles.vue
    └── ...

docs/
└── AUTHORIZATION_SYSTEM.md (comprehensive documentation)
```

## Next Steps

### 1. Run the Migration
```bash
cd backend
npm run migrate:latest
```

### 2. Initialize Existing Objects
Set default access models for existing object definitions:
```sql
UPDATE object_definitions 
SET 
  access_model = 'owner',
  public_read = false,
  public_create = false,
  public_update = false,
  public_delete = false,
  owner_field = 'ownerId'
WHERE access_model IS NULL;
```

### 3. Apply Query Scoping
Update existing controllers to use query scoping:

```typescript
import { applyReadScope } from '@/auth/query-scope.util';

// In your list endpoint
async findAll(@CurrentUser() user: User) {
  const objectDef = await ObjectDefinition.query(this.knex)
    .findOne({ apiName: 'YourObject' });
  
  let query = YourModel.query(this.knex);
  query = applyReadScope(query, user, objectDef, this.knex);
  
  return query;
}
```

### 4. Add Route Protection
Use guards on sensitive endpoints:

```typescript
@UseGuards(JwtAuthGuard, AbilitiesGuard)
@CheckAbility({ action: 'update', subject: 'Post' })
async update(@Body() data: any) {
  // Only users with 'update' permission on 'Post' can access
}
```

### 5. Frontend Integration
Add sharing button to record detail pages:

```vue
<template>
  <div>
    <!-- Your record details -->
    <Button @click="showShareDialog = true">
      <Share class="w-4 h-4 mr-2" />
      Share
    </Button>
    
    <RecordShareDialog
      :open="showShareDialog"
      :object-definition-id="objectDefinition.id"
      :record-id="record.id"
      :fields="objectDefinition.fields"
      @close="showShareDialog = false"
    />
  </div>
</template>
```

## Testing Checklist

- [ ] Run database migration successfully
- [ ] Create a test role with permissions
- [ ] Configure object access settings via UI
- [ ] Share a record with another user
- [ ] Verify shared record appears in grantee's list
- [ ] Verify query scoping filters unauthorized records
- [ ] Test field-level permissions
- [ ] Test share expiration
- [ ] Test share revocation
- [ ] Test role-based access with conditions

## Performance Considerations

1. **Index Usage**: The migration creates proper indexes on foreign keys and commonly queried columns
2. **Query Scoping**: Uses SQL EXISTS subqueries for efficient filtering
3. **Ability Caching**: Consider caching abilities per request (already done via middleware)
4. **Batch Loading**: When checking multiple records, batch the share lookups

## Security Notes

⚠️ **Important**: Always use SQL query scoping for list endpoints. Never fetch all records and filter in application code.

✅ **Best Practices**:
- Share creation requires ownership verification
- Only grantors can update/revoke shares
- Expired/revoked shares are excluded from queries
- Field-level permissions are enforced on write operations

## Documentation

Full documentation available in:
- [AUTHORIZATION_SYSTEM.md](./AUTHORIZATION_SYSTEM.md) - Comprehensive guide
- Inline code comments in all new files
- JSDoc comments on key functions

## Support

For questions or issues:
1. Check the documentation in `docs/AUTHORIZATION_SYSTEM.md`
2. Review example usage in the controllers
3. Examine the test cases (when added)