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.

• 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

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

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.

This project is licensed under the MIT License.