Stripe webhooks on Rails: verify request.raw_post and skip forgery protection
# Stripe webhooks on Rails
Two Rails defaults break Stripe webhooks: `protect_from_forgery` rejects the POST with no authenticity token, and `params` gives you parsed data. Skip forgery protection for the webhook action and verify `request.raw_post`.
## The setup
```
class WebhooksController < ApplicationController
skip_before_action :verify_authenticity_token, only: [:stripe]
def stripe
payload = request.raw_post
sig = request.headers['Stripe-Signature']
begin
event = Stripe::Webhook.construct_event(
payload, sig, ENV['STRIPE_WEBHOOK_SIGNING_VALUE']
)
rescue Stripe::SignatureVerificationError, JSON::ParserError
return head :bad_request
end
# case event.type ...
head :ok
end
end
```
```
post '/webhooks/stripe', to: 'webhooks#stripe'
```
## Notes
- Scope the skip to the webhook action only, never the whole controller.
- `request.raw_post` returns the unparsed body string; `params` is already parsed and will fail verification.
- Rescue `JSON::ParserError` too: a garbage body should be a 400, not a 500.Maintainer review
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