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# frozen_string_literal: true
module Members
module Mailgun
class PermanentFailuresController < ApplicationController
respond_to :json
skip_before_action :authenticate_user!
skip_before_action :verify_authenticity_token
before_action :ensure_feature_enabled!
before_action :authenticate_signature!
before_action :validate_invite_email!
feature_category :authentication_and_authorization
def create
webhook_processor.execute
head :ok
end
private
def ensure_feature_enabled!
render_406 unless Gitlab::CurrentSettings.mailgun_events_enabled?
end
def authenticate_signature!
access_denied! unless valid_signature?
end
def valid_signature?
return false if Gitlab::CurrentSettings.mailgun_signing_key.blank?
# per this guide: https://documentation.mailgun.com/en/latest/user_manual.html#webhooks
digest = OpenSSL::Digest.new('SHA256')
data = [params.dig(:signature, :timestamp), params.dig(:signature, :token)].join
hmac_digest = OpenSSL::HMAC.hexdigest(digest, Gitlab::CurrentSettings.mailgun_signing_key, data)
ActiveSupport::SecurityUtils.secure_compare(params.dig(:signature, :signature), hmac_digest)
end
def validate_invite_email!
# permanent_failures webhook does not provide a way to filter failures, so we'll get them all on this endpoint
# and we only care about our invite_emails
render_406 unless payload[:tags]&.include?(::Members::Mailgun::INVITE_EMAIL_TAG)
end
def webhook_processor
::Members::Mailgun::ProcessWebhookService.new(payload)
end
def payload
@payload ||= params.permit!['event-data']
end
def render_406
# failure to stop retries per https://documentation.mailgun.com/en/latest/user_manual.html#webhooks
head :not_acceptable
end
end
end
end
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