Add support for incoming webhooks in plugins

[Twixes]

Something like Segment Source Functions - a way for plugins to listen for webhook requests, processing the incoming data as PostHog events.

[mariusandra]

I believe adding this would seriously improve the capabilities of plugins.

The MVP would look something like this:

• New table: plugin config webhooks
• If a plugin has a onRequest function, we store this capability and generate a webhook URL for the plugin. Something like https://app.site_url.com/w/${some_serious_hash}/${pluginConfig.id}/request
• Anything submitted here (POST or GET), gets picked up by django, validated (hash and ID are valid), sent to a Kafka topic
• Yet another queue, WebhookQueue or whatever reads the topic on the plugin server and calls onRequest (or onWebhook?) with the data.
• The param for onRequest contains the payload sent the webhook, with metadata like http headers, etc.
• Django only replies "200 OK" to the webhooks
• A onRequest could throw a RetryError and thus be retried later.

[posthog-bot]

This issue hasn't seen activity in two years! If you want to keep it open, post a comment or remove the stale label – otherwise this will be closed in two weeks.

[posthog-bot]

This issue was closed due to lack of activity. Feel free to reopen if it's still relevant.