igny8/igny8-wp-plugin/docs/PHASE_6_IMPLEMENTATION_SUMMARY.md

# Phase 6 Implementation Summary

## Overview
Phase 6 implementation adds webhook support and remote control capabilities, allowing IGNY8 SaaS to send events to WordPress.

## Implemented Features

### 6.1 REST Route Registration with Shared Secret ✅

**Files Created:**
- `includes/class-igny8-webhooks.php` - Main webhook handler class

**Features:**
- **REST Endpoint**: `/wp-json/igny8/v1/event` (POST)
- **Shared Secret Authentication**: HMAC-SHA256 signature verification
- **Connection Check**: All webhook handlers verify `igny8_is_connection_enabled()` before processing

**Security:**
- Webhook secret stored in WordPress options (auto-generated on first use)
- Signature verification via `X-IGNY8-Signature` header
- Secret can be regenerated from settings page
- Failed authentication attempts are logged

**Functions:**
- `igny8_get_webhook_secret()` - Get or generate webhook secret
- `igny8_regenerate_webhook_secret()` - Regenerate secret

---

### 6.2 SaaS Event Handlers ✅

**Event Types Supported:**

#### 1. Task Published (`task_published`, `task_completed`)
- Creates or updates WordPress post from IGNY8 task
- Fetches full task data from Writer API
- Respects enabled post types
- Updates post status if task is completed

#### 2. Link Recommendation (`link_recommendation`, `insert_link`)
- Queues link insertion for processing
- Validates required parameters (post_id, target_url, anchor)
- Respects Linker module toggle
- Processes links asynchronously via cron

#### 3. Optimizer Request (`optimizer_request`, `optimizer_job_completed`)
- Updates optimizer job status
- Stores score changes and recommendations
- Updates post meta with optimizer data
- Respects Optimizer module toggle

**Event Handler Flow:**
1. Verify connection is enabled
2. Verify module is enabled (if applicable)
3. Validate event data
4. Process event
5. Log activity
6. Return unified JSON response

---

### 6.3 Webhook Activity Logging ✅

**Files Created:**
- `includes/class-igny8-webhook-logs.php` - Logging functions

**Features:**
- **Log Storage**: WordPress options (last 500 logs)
- **Log Fields**:
  - Event type
  - Event data
  - IP address
  - User agent
  - Status (received, processed, failed)
  - Response data
  - Timestamps (received_at, processed_at)
  - Error messages

**Functions:**
- `igny8_log_webhook_activity()` - Log webhook receipt
- `igny8_update_webhook_log()` - Update log with processing result
- `igny8_get_webhook_logs()` - Retrieve logs with filtering
- `igny8_clear_old_webhook_logs()` - Cleanup old logs

**UI Display:**
- Recent webhook activity table in settings page
- Shows last 10 webhook events
- Displays event type, status, and timestamp

---

### Link Queue System ✅

**Files Created:**
- `includes/class-igny8-link-queue.php` - Link insertion queue

**Features:**
- **Queue Storage**: WordPress options
- **Queue Processing**: Cron-based (processes 10 items per run)
- **Retry Logic**: Up to 3 attempts per link
- **Status Tracking**: pending, completed, failed

**Link Insertion Logic:**
1. Finds anchor text in post content
2. Wraps anchor with link tag
3. Avoids duplicate links
4. Falls back to appending link if anchor not found

**Queue Management:**
- Automatic processing via cron
- Manual trigger available
- Queue size limit (1000 items)
- Status tracking per item

---

## Connection Checks

**All handlers check connection status:**

✅ **Webhook Handler** (`verify_webhook_secret`)
- Checks `igny8_is_connection_enabled()` before allowing webhook

✅ **Event Handlers** (`handle_webhook`, `handle_task_published`, etc.)
- Double-checks connection enabled before processing
- Returns error if connection disabled

✅ **Link Queue** (`igny8_queue_link_insertion`, `igny8_process_link_queue`)
- Checks connection enabled before queuing/processing

✅ **REST API Endpoints** (existing endpoints)
- Updated to check connection enabled
- Returns 403 if connection disabled

---

## Settings UI Enhancements

**New Sections Added:**

1. **Webhook Configuration**
   - Webhook URL display with copy button
   - Webhook secret display with copy button
   - Regenerate secret button

2. **Link Queue**
   - Shows pending links count
   - Displays queue table (last 10 items)
   - Shows post ID, anchor, target URL, status

3. **Recent Webhook Activity**
   - Shows last 10 webhook events
   - Displays event type, status, timestamp
   - Color-coded status badges

---

## Security Features

1. **HMAC Signature Verification**
   - Uses SHA-256 HMAC
   - Compares request body signature
   - Prevents replay attacks

2. **Connection Toggle Protection**
   - All endpoints check connection status
   - Webhooks rejected if connection disabled
   - Clear error messages

3. **Module Toggle Respect**
   - Events only processed if module enabled
   - Graceful error responses

4. **Input Validation**
   - All parameters sanitized
   - Required fields validated
   - Type checking

---

## API Response Format

All webhook responses follow unified JSON format:

**Success:**
```json
{
  "success": true,
  "message": "Event processed",
  "data": { ... }
}
```

**Error:**
```json
{
  "success": false,
  "error": "Error message",
  "code": "error_code"
}
```

---

## Integration Points

### Modified Files:
- `igny8-bridge.php` - Added webhook classes loading
- `includes/functions.php` - Added webhook secret functions
- `includes/class-igny8-rest-api.php` - Added connection checks
- `admin/settings.php` - Added webhook UI sections
- `admin/class-admin.php` - Added secret regeneration handler

### New Dependencies:
- None (uses existing WordPress functions)

---

## Testing Checklist

- [ ] Webhook endpoint accessible at `/wp-json/igny8/v1/event`
- [ ] Signature verification works correctly
- [ ] Invalid signatures are rejected
- [ ] Connection disabled blocks webhooks
- [ ] Task published event creates/updates posts
- [ ] Link recommendation queues links
- [ ] Link queue processes links correctly
- [ ] Optimizer events update post meta
- [ ] Webhook logs are created and updated
- [ ] Settings UI displays webhook info
- [ ] Secret regeneration works
- [ ] All events respect module toggles
- [ ] All events respect connection toggle

---

## Notes

1. **Webhook Secret**: Auto-generated on first use. Must be configured in IGNY8 SaaS app.

2. **Link Queue**: Processes 10 items per cron run to prevent timeouts. Can be adjusted.

3. **Log Retention**: Keeps last 500 logs. Older logs can be cleared manually.

4. **Signature Header**: IGNY8 SaaS must send `X-IGNY8-Signature` header with HMAC-SHA256 signature of request body.

5. **Connection Toggle**: All webhook handlers check connection status before processing. This ensures no data is processed when connection is disabled.

6. **Module Toggles**: Each event type checks if its module is enabled before processing.

---

## Webhook Payload Examples

### Task Published
```json
{
  "event": "task_published",
  "data": {
    "task_id": 123,
    "status": "completed"
  }
}
```

### Link Recommendation
```json
{
  "event": "link_recommendation",
  "data": {
    "post_id": 456,
    "target_url": "https://example.com/page",
    "anchor": "example link",
    "priority": "normal"
  }
}
```

### Optimizer Request
```json
{
  "event": "optimizer_job_completed",
  "data": {
    "post_id": 456,
    "job_id": 789,
    "status": "completed",
    "score_changes": { ... },
    "recommendations": [ ... ]
  }
}
```

---

## Next Steps

Phase 6 is complete. All webhook functionality is implemented with proper security, logging, and connection checks.