/Ghost-BunnyCDN-Cache-Clearer

Cloudflare Worker that automatically purges BunnyCDN pull zone cache and cleans up Perma-Cache folders upon receiving Ghost CMS webhooks, optimizing storage usage and reducing costs.

Primary LanguageJavaScriptMIT LicenseMIT

Ghost BunnyCDN Cache Purger

Motivation

BunnyCDN's Perma-Cache feature retains files in a new directory structure after a full pull zone purge. While this can improve performance in some scenarios, it may lead to unnecessary storage costs over time. This webhook-based solution automates the clearing of old cache folders, preventing excessive space usage and associated expenses.

Features

  • Automatically purges BunnyCDN pull zone cache upon receiving a webhook from Ghost CMS
  • Clears old Perma-Cache folders to prevent unnecessary storage usage
  • Verifies webhook signatures for security
  • Logs detailed information for easy debugging and monitoring
  • Designed to run as a Cloudflare Worker for scalability and low latency

Installation

  1. Clone this repository:

    git clone https://github.com/yourusername/bunnycdn-cache-purger.git

  2. Set up a Cloudflare Worker:

    • Log in to your Cloudflare account and navigate to the Workers section
    • Create a new Worker and paste the contents of index.js into the script editor

  3. Set up environment variables in your Cloudflare Worker:

    • GHOST_WEBHOOK_SECRET: Your Ghost webhook secret
    • BUNNY_PULLZONE_ID: Your BunnyCDN pull zone ID
    • BUNNY_API_KEY: Your BunnyCDN account API key
    • BUNNY_STORAGE_ZONE_HOSTNAME: Your storage zone hostname (e.g., "ny.storage.bunnycdn.com")
    • BUNNY_STORAGE_ZONE_NAME: Your storage zone name
    • BUNNY_STORAGE_ZONE_PASSWORD: Your storage zone password

  4. Configure your Ghost CMS to send webhooks to your Cloudflare Worker URL when content is published or updated

Code Overview

The main components of the script are:

  • handleRequest: The main function that processes incoming requests
  • verifySignature: Verifies the Ghost webhook signature for security
  • cleanupPermaCacheFolders: Clears old Perma-Cache folders in BunnyCDN storage

The script listens for POST requests to the /purge-full-cache endpoint. When a valid request is received, it:

  1. Verifies the Ghost webhook signature
  2. Purges the BunnyCDN pull zone cache
  3. Cleans up old Perma-Cache folders

Detailed logs are provided at each step for easy monitoring and debugging.

License

This project is licensed under the MIT License.