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# frozen_string_literal: true
# Ingests inbound emails from Mandrill.
#
# Requires a +mandrill_events+ parameter containing a JSON array of Mandrill inbound email event objects.
# Each event is expected to have a +msg+ object containing a full RFC 822 message in its +raw_msg+ property.
#
# Returns:
#
# - <tt>204 No Content</tt> if an inbound email is successfully recorded and enqueued for routing to the appropriate mailbox
# - <tt>401 Unauthorized</tt> if the request's signature could not be validated
# - <tt>404 Not Found</tt> if Action Mailbox is not configured to accept inbound emails from Mandrill
# - <tt>422 Unprocessable Entity</tt> if the request is missing required parameters
# - <tt>500 Server Error</tt> if the Mandrill API key is missing, or one of the Active Record database,
# the Active Storage service, or the Active Job backend is misconfigured or unavailable
class ActionMailbox::Ingresses::Mandrill::InboundEmailsController < ActionMailbox::BaseController
before_action :authenticate
def create
raw_emails.each { |raw_email| ActionMailbox::InboundEmail.create_and_extract_message_id! raw_email }
head :ok
rescue JSON::ParserError => error
logger.error error.message
head :unprocessable_entity
end
private
def raw_emails
events.select { |event| event["event"] == "inbound" }.collect { |event| event.dig("msg", "raw_msg") }
end
def events
JSON.parse params.require(:mandrill_events)
end
def authenticate
head :unauthorized unless authenticated?
end
def authenticated?
if key.present?
Authenticator.new(request, key).authenticated?
else
raise ArgumentError, <<~MESSAGE.squish
Missing required Mandrill API key. Set action_mailbox.mandrill_api_key in your application's
encrypted credentials or provide the MANDRILL_INGRESS_API_KEY environment variable.
MESSAGE
end
end
def key
Rails.application.credentials.dig(:action_mailbox, :mandrill_api_key) || ENV["MANDRILL_INGRESS_API_KEY"]
end
class Authenticator
attr_reader :request, :key
def initialize(request, key)
@request, @key = request, key
end
def authenticated?
ActiveSupport::SecurityUtils.secure_compare given_signature, expected_signature
end
private
def given_signature
request.headers["X-Mandrill-Signature"]
end
def expected_signature
Base64.strict_encode64 OpenSSL::HMAC.digest(OpenSSL::Digest::SHA1.new, key, message)
end
def message
request.url + request.POST.sort.flatten.join
end
end
end
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