Serverless adblocking via Cloudflare Zero Trust Gateway
### What is this?
This is a serverless adblocking solution that uses Cloudflare's Zero Trust Gateway to block ads by parsing a hosts file and creating a firewall rule to block the domains. It can be used as an alternative to Pi-Hole or other adblocking solutions.
This project was heavily inspired by [this blog post](https://blog.marcolancini.it/2022/blog-serverless-ad-blocking-with-cloudflare-gateway/)
### Pre-requisites
* Python > 3.10
* A Cloudflare account with Zero Trust enabled
* A Cloudflare API tolken with the following permissions:
* Zero Trust: Edit
* Account Firewall Access Rules: Edit
* Access: Apps and Policies: Edit
* A device with the WARP client installed and configured to use a Zero Trust account
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### Installation
#### From PyPi
`pip install cloudflare-gateway-adblocking`
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### Usage
#### Setting Cloudflare credentials
##### Environment variables
The following environment variables can be used to set the Cloudflare credentials:
*`CLOUDFLARE_ACCOUNT_ID`
*`CLOUDFLARE_TOKEN`
These can either be set in the environment or in a `.env` file in the current working directory.
#### Command line flags
The following command line flags can be used to set the Cloudflare credentials:
* Cloudflare Account ID: `--account-id` / `-a`
* Cloudflare Token: `--token` / `-t`
#### Passing blocklists
Blocklists can be passed to the program via the command line flag `--blocklist` / `-b`. This flag can either point to a hosts file or a directory containing hosts files. If this flag is not passed, the program will look for a file or directory named `blocklists` in the current working directory.
Whitelists can be passed to the program via the command line flag `--whitelist` / `-w`. This flag can either point to a hosts file or a directory containing hosts files. If this flag is not passed, then if a file or directory named `whitelists` exists in the current working directory, it will be used. Domains in this whitelist will be excluded from the blocklists.
