# OCR API Security Review

**Last Updated:** 2026-01-19

## Security Assessment

### ✅ API Key Security

**Status:** SECURE

- **Server-Side Only:** API keys are never exposed to client-side code
- **No Client Exposure:** JavaScript files do not contain API keys
- **Secure Storage:** Keys stored in environment variables or PHP constants
- **Logging:** Only key previews (first 10-20 chars) are logged, never full keys
- **Error Messages:** API keys are never included in error messages

**Verification:**
```bash
# Check JavaScript files for API keys
grep -r "GOOGLE.*VISION.*API.*KEY" v2/js/
# Result: No matches found

# Check for API key in console logs
grep -r "console.*api.*key" v2/js/ -i
# Result: No matches found
```

### ✅ HTTPS Usage

**Status:** SECURE

- **API Endpoint:** All Vision API calls use HTTPS (`https://vision.googleapis.com`)
- **Frontend:** Form submissions use HTTPS (enforced by server)
- **No HTTP Fallback:** No insecure HTTP endpoints

**Verification:**
- API URL: `https://vision.googleapis.com/v1/images:annotate`
- Frontend endpoint: `/v2/api/ocr-business-card.php` (server-side)

### ⚠️ Rate Limiting

**Status:** PARTIAL

**Current Implementation:**
- No explicit rate limiting implemented in PHP code
- Relies on Google Cloud API quotas
- HTTP 429 errors are handled gracefully

**Recommendations:**
1. Implement request throttling for high-volume usage
2. Add rate limiting middleware if needed
3. Monitor API quota usage
4. Set up Google Cloud quota alerts

**Error Handling:**
```php
if ($httpCode === 429) {
    $userFriendlyMessage = 'API quota exceeded. Please try again later.';
}
```

### ✅ Input Validation

**Status:** SECURE

- **File Type Validation:** Only JPEG, PNG, WebP allowed
- **File Size Validation:** Maximum 3MB (before encoding)
- **Dimension Validation:** Maximum 20 megapixels
- **Base64 Size Check:** Maximum 4MB after encoding
- **MIME Type Verification:** Validates actual file type, not just extension

**Validation Points:**
1. File upload validation (`$_FILES['image']`)
2. File existence check
3. MIME type validation
4. File size validation
5. Image dimension validation
6. Base64 size validation

### ✅ Error Message Security

**Status:** SECURE

- **No Key Exposure:** API keys never included in error messages
- **User-Friendly Messages:** Generic messages for users
- **Detailed Logging:** Full error details logged server-side only
- **Debug Mode:** Detailed errors only shown in debug mode

**Example:**
```php
// ✅ GOOD: User-friendly message
$userFriendlyMessage = 'OCR processing failed. Please try again.';

// ❌ BAD: Would expose API key (not in code)
// $userFriendlyMessage = "API key {$apiKey} is invalid.";
```

### ✅ Data Privacy

**Status:** SECURE

- **Image Processing:** Images processed server-side only
- **No Storage:** Images not permanently stored (processed and discarded)
- **Temporary Files:** Uses PHP temporary upload directory
- **Logging:** No image data logged, only metadata

### ⚠️ API Key Restrictions

**Status:** RECOMMENDED

**Current State:**
- API keys may not have restrictions configured
- Should restrict to Vision API only
- Should set HTTP referrer restrictions for web usage

**Recommendations:**
1. Configure API key restrictions in Google Cloud Console
2. Restrict to Cloud Vision API only
3. Set HTTP referrer restrictions
4. Consider IP restrictions for server-only usage

**Configuration:**
- Console: https://console.cloud.google.com/apis/credentials?project=ordio-256916
- Restrict to: Cloud Vision API
- HTTP Referrer: Your domain(s)
- IP Restrictions: Server IPs (if applicable)

## Security Checklist

- [x] API keys not exposed client-side
- [x] HTTPS used for all API calls
- [x] Input validation implemented
- [x] Error messages don't expose sensitive data
- [x] Images processed server-side only
- [x] No permanent image storage
- [ ] Rate limiting implemented (relies on Google quotas)
- [ ] API key restrictions configured (recommended)
- [x] Logging doesn't expose full API keys
- [x] Debug mode properly gated

## Recommendations

### High Priority

1. **Configure API Key Restrictions**
   - Restrict to Cloud Vision API only
   - Set HTTP referrer restrictions
   - Review and update regularly

2. **Monitor API Usage**
   - Set up billing alerts
   - Monitor quota usage
   - Track API call patterns

### Medium Priority

3. **Implement Rate Limiting**
   - Add request throttling if needed
   - Implement per-IP limits
   - Add queue system for high volume

4. **Enhanced Logging**
   - Log API usage metrics
   - Track error rates
   - Monitor performance

### Low Priority

5. **Security Headers**
   - Ensure proper CORS headers
   - Verify CSP headers
   - Check security headers

## Related Documentation

- [Google Vision API Setup Guide](GOOGLE_VISION_API_SETUP.md)
- [OCR API Patterns](../../../.cursor/rules/ocr-api.mdc)
- [Event Form Implementation](../forms/EVENT_FORM_IMPLEMENTATION.md)