Optimize the performance, and logic etc.

README.md

@@ -35,19 +35,52 @@ BunnyCDN's Perma-Cache feature retains files in a new directory structure after
 
 ## Code Overview
 
-The main components of the script are:
+### Main Request Handler
 
-- `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 `handleRequest` function is the main entry point for processing requests:
 
-The script listens for POST requests to the `/purge-full-cache` endpoint. When a valid request is received, it:
+1. It first checks if all required environment variables are set.
+2. It then examines the request path.
+3. If the path is '/purge-full-cache', it proceeds with the cache purging process.
 
-1. Verifies the Ghost webhook signature
-2. Purges the BunnyCDN pull zone cache
-3. Cleans up old Perma-Cache folders
+### Authentication
 
-Detailed logs are provided at each step for easy monitoring and debugging.
+The code supports two types of authentication:
+
+1. **Manual Trigger**: It checks for a 'manualtriggertoken' header. If this matches the `MANUAL_TRIGGER_TOKEN` environment variable, it bypasses further authentication.
+
+2. **Ghost Webhook Verification**: If it's not a manual trigger, it verifies the request signature using the `verifySignature` function. This function:
+   - Extracts the signature and timestamp from the 'X-Ghost-Signature' header.
+   - Checks if the timestamp is within 5 minutes of the current time.
+   - Computes a hash using the request body, timestamp, and the `GHOST_WEBHOOK_SECRET`.
+   - Compares the computed hash with the provided signature.
+
+### Cache Purging
+
+If authentication is successful, the code proceeds to purge the BunnyCDN cache:
+
+1. It sends a POST request to the BunnyCDN API to purge the entire pull zone cache.
+2. The pull zone ID and API key are taken from environment variables.
+
+### Perma-Cache Cleanup
+
+After successfully purging the cache, it calls the `cleanupPermaCacheFolders` function:
+
+1. This function first fetches a list of all folders in the '__bcdn_perma_cache__' directory of the BunnyCDN storage zone.
+2. It then iterates through each folder and sends a DELETE request to remove it.
+3. It keeps track of successful deletions and failures.
+
+### Error Handling and Logging
+
+Throughout the code, there are numerous `console.log` statements for debugging and error tracking. Each major function also has try-catch blocks to handle and log errors.
+
+### Response
+
+The worker responds with different HTTP status codes based on the outcome:
+- 200: Successful cache purge and cleanup
+- 403: Invalid signature
+- 404: Invalid path
+- 500: Any other errors
 
 ## License