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# frozen_string_literal: true
# Ingests inbound emails from SendGrid. Requires an +email+ parameter containing a full RFC 822 message.
#
# Authenticates requests using HTTP basic access authentication. The username is always +actionmailbox+, and the
# password is read from the application's encrypted credentials or an environment variable. See the Usage section below.
#
# Note that basic authentication is insecure over unencrypted HTTP. An attacker that intercepts cleartext requests to
# the SendGrid ingress can learn its password. You should only use the SendGrid ingress over HTTPS.
#
# 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 SendGrid
# - <tt>422 Unprocessable Entity</tt> if the request is missing the required +email+ parameter
# - <tt>500 Server Error</tt> if the ingress password is not configured, or if one of the Active Record database,
# the Active Storage service, or the Active Job backend is misconfigured or unavailable
#
# == Usage
#
# 1. Tell Action Mailbox to accept emails from SendGrid:
#
# # config/environments/production.rb
# config.action_mailbox.ingress = :sendgrid
#
# 2. Generate a strong password that Action Mailbox can use to authenticate requests to the SendGrid ingress.
#
# Use <tt>rails credentials:edit</tt> to add the password to your application's encrypted credentials under
# +action_mailbox.ingress_password+, where Action Mailbox will automatically find it:
#
# action_mailbox:
# ingress_password: ...
#
# Alternatively, provide the password in the +RAILS_INBOUND_EMAIL_PASSWORD+ environment variable.
#
# 3. {Configure SendGrid Inbound Parse}{https://sendgrid.com/docs/for-developers/parsing-email/setting-up-the-inbound-parse-webhook/}
# to forward inbound emails to +/rails/action_mailbox/sendgrid/inbound_emails+ with the username +actionmailbox+ and
# the password you previously generated. If your application lived at <tt>https://example.com</tt>, you would
# configure SendGrid with the following fully-qualified URL:
#
# https://actionmailbox:PASSWORD@example.com/rails/action_mailbox/sendgrid/inbound_emails
#
# *NOTE:* When configuring your SendGrid Inbound Parse webhook, be sure to check the box labeled *"Post the raw,
# full MIME message."* Action Mailbox needs the raw MIME message to work.
class ActionMailbox::Ingresses::Sendgrid::InboundEmailsController < ActionMailbox::BaseController
before_action :authenticate_by_password
def create
ActionMailbox::InboundEmail.create_and_extract_message_id! params.require(:email)
end
end
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