github-webhook-filter

A webhook filter for Deno that filters GitHub events before forwarding them to a Discord webhook, reducing noise.
Additionally, it attempts to handle Discord ratelimits and resend the webhook events if needed, instead of just dropping the requests like GitHub does.

Certain no-op events (which Discord would ignore anyway) and common CI bots are ignored by default; see configuration below for more.

Usage

0. Host the project somewhere, for example https://deno.com/deploy. Remember to add the environment variables you may want to set, see lib/config.ts.
1. Create a Discord webhook (https://discord.com/api/webhooks/1234/ABCDWXYZ).
2. Take the ID (1234) and token (ABCDWXYZ) from the URL, and enter https://<filter_url>/1234/ABCDWXYZ (note: no /github) in the GitHub webhook settings:
   
3. Optionally add configuration parameters (see below) to the URL, e.g. ?allowBranches=master,dev&hideTags=1.
4. ????
5. Profit!

Configuration

Additional options can be configured per URL:

• Only forward events from specific branches (allowBranches, simplified wildcard syntax)
  • abc*xyz is equivalent to /^(abc.*xyz)$/
  • stuff,things is equivalent to /^(stuff|things)$/
  • !oh*hi*there is equivalent to /^(oh.*hi.*there)$/ inverted
• Ignore tag updates (hideTags)
• Ignore burst PR review comments in a short timespan, only showing the first x comments per review (commentBurstLimit)