# API Authentication Fixes - RateRight v2 App

## Summary
Added authentication checks to all unprotected API routes as identified in the CRITICAL audit item C2.

## Routes Fixed

### 1. `/api/abn-lookup/route.ts`
- **Issue:** No authentication check
- **Fix:** Added Supabase authentication check using `createClient()` and `getUser()`
- **Changes:**
  - Added import: `import { createClient } from "@/lib/supabase/server";`
  - Added auth check at beginning of GET handler:
    ```typescript
    // Check authentication
    const supabase = await createClient();
    const { data: { user } } = await supabase.auth.getUser();
    
    if (!user) {
      return NextResponse.json({ 
        success: false, 
        error: 'Unauthorized' 
      }, { status: 401 });
    }
    ```

### 2. `/api/ai/generate-profile/route.ts`
- **Issue:** No authentication check
- **Fix:** Added Supabase authentication check
- **Changes:**
  - Added import: `import { createClient } from "@/lib/supabase/server";`
  - Added auth check at beginning of POST handler:
    ```typescript
    // Check authentication
    const supabase = await createClient();
    const { data: { user } } = await supabase.auth.getUser();
    
    if (!user) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
    }
    ```

### 3. `/api/company-logo/route.ts`
- **Issue:** No authentication check
- **Fix:** Added Supabase authentication check
- **Changes:**
  - Added import: `import { createClient } from "@/lib/supabase/server";`
  - Added auth check at beginning of GET handler:
    ```typescript
    // Check authentication
    const supabase = await createClient();
    const { data: { user } } = await supabase.auth.getUser();
    
    if (!user) {
      return NextResponse.json<LogoResponse>(
        { logoUrl: null, source: 'none' },
        { status: 401 }
      );
    }
    ```

### 4. `/api/auth/verify-email/route.ts`
- **Issue:** No authentication check + non-functional placeholder
- **Fix:** Added authentication + deprecated endpoint (returns 410 Gone)
- **Changes:**
  - Added import: `import { createClient } from "@/lib/supabase/server";`
  - Added auth check at beginning of POST handler
  - Changed response to 410 Gone with message:
    ```typescript
    // Return 410 Gone - this endpoint is deprecated
    return NextResponse.json(
      { 
        error: "Use the email verification link sent to your inbox. This API endpoint is deprecated.",
        success: false
      },
      { status: 410 } // Gone
    );
    ```

## Testing Requirements
1. All endpoints should now return 401 Unauthorized when accessed without valid authentication
2. Authenticated users should be able to access the endpoints normally
3. The verify-email endpoint should always return 410 Gone (deprecated)

## Security Impact
- **Before:** Anyone on the internet could call these API endpoints
- **After:** Only authenticated users with valid Supabase sessions can access these endpoints
- **Risk Mitigated:** Financial loss (OpenAI credits), abuse, information disclosure

## Notes
- The verify-email endpoint is deprecated as Supabase handles email verification via magic links
- The authentication pattern follows the existing app architecture using Supabase server-side auth
- All endpoints now properly validate user sessions before processing requests