metabuilder/packages/notification_center/workflow/dispatch.jsonscript

{
  "version": "2.2.0",
  "name": "Dispatch Notification",
  "description": "Send notification via configured channels (in-app, email, push, webhook) with rate limiting",
  "trigger": {
    "type": "http",
    "method": "POST",
    "path": "/notifications/dispatch"
  },
  "nodes": [
    {
      "id": "validate_context",
      "type": "operation",
      "op": "validate",
      "input": "{{ $context.tenantId }}",
      "validator": "required"
    },
    {
      "id": "validate_input",
      "type": "operation",
      "op": "validate",
      "input": "{{ $json }}",
      "rules": {
        "userId": "required|string",
        "type": "required|string",
        "title": "required|string|maxLength:200",
        "message": "required|string|maxLength:1000",
        "channels": "required|array"
      }
    },
    {
      "id": "fetch_user_preferences",
      "type": "operation",
      "op": "database_read",
      "entity": "NotificationPreference",
      "params": {
        "filter": {
          "userId": "{{ $json.userId }}",
          "tenantId": "{{ $context.tenantId }}"
        }
      }
    },
    {
      "id": "create_notification_record",
      "type": "operation",
      "op": "database_create",
      "entity": "Notification",
      "data": {
        "tenantId": "{{ $context.tenantId }}",
        "userId": "{{ $json.userId }}",
        "type": "{{ $json.type }}",
        "title": "{{ $json.title }}",
        "message": "{{ $json.message }}",
        "isRead": false,
        "metadata": "{{ $json.metadata || {} }}",
        "createdAt": "{{ new Date().toISOString() }}",
        "expiresAt": "{{ new Date(Date.now() + 30 * 24 * 60 * 60 * 1000).toISOString() }}"
      }
    },
    {
      "id": "dispatch_in_app",
      "type": "operation",
      "op": "condition",
      "condition": "{{ $json.channels.includes('in_app') && $steps.fetch_user_preferences.output.enableInApp !== false }}"
    },
    {
      "id": "emit_in_app_notification",
      "type": "action",
      "action": "emit_event",
      "event": "notification_received",
      "channel": "{{ 'user:' + $json.userId }}",
      "data": {
        "notificationId": "{{ $steps.create_notification_record.output.id }}",
        "title": "{{ $json.title }}",
        "message": "{{ $json.message }}",
        "type": "{{ $json.type }}"
      }
    },
    {
      "id": "check_email_rate_limit",
      "type": "operation",
      "op": "condition",
      "condition": "{{ $json.channels.includes('email') && $steps.fetch_user_preferences.output.enableEmail !== false }}"
    },
    {
      "id": "apply_email_rate_limit",
      "type": "operation",
      "op": "rate_limit",
      "key": "{{ 'email:' + $json.userId }}",
      "limit": 10,
      "window": 3600000
    },
    {
      "id": "fetch_user_email",
      "type": "operation",
      "op": "database_read",
      "entity": "User",
      "params": {
        "filter": {
          "id": "{{ $json.userId }}",
          "tenantId": "{{ $context.tenantId }}"
        }
      }
    },
    {
      "id": "send_email",
      "type": "operation",
      "op": "email_send",
      "to": "{{ $steps.fetch_user_email.output.email }}",
      "subject": "{{ $json.title }}",
      "body": "{{ $json.message }}",
      "template": "{{ $json.emailTemplate || 'default' }}"
    },
    {
      "id": "dispatch_push",
      "type": "operation",
      "op": "condition",
      "condition": "{{ $json.channels.includes('push') && $steps.fetch_user_preferences.output.enablePush !== false }}"
    },
    {
      "id": "send_push_notification",
      "type": "operation",
      "op": "http_request",
      "url": "https://fcm.googleapis.com/fcm/send",
      "method": "POST",
      "headers": {
        "Authorization": "{{ 'Bearer ' + $env.FCM_KEY }}"
      },
      "body": {
        "to": "{{ $steps.fetch_user_email.output.fcmToken }}",
        "notification": {
          "title": "{{ $json.title }}",
          "body": "{{ $json.message }}"
        }
      }
    },
    {
      "id": "return_success",
      "type": "action",
      "action": "http_response",
      "status": 202,
      "body": {
        "notificationId": "{{ $steps.create_notification_record.output.id }}",
        "message": "Notification dispatched successfully"
      }
    }
  ]
}