Class: EmailEvents::Service::RetrieveDataFromHeader

Inherits:
EmailEvents::Service show all
Defined in:
lib/email_events/services/retrieve_data_from_header.rb

Instance Method Summary collapse

Methods inherited from EmailEvents::Service

call

Instance Method Details

#call ⇒ Object 



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# File 'lib/email_events/services/retrieve_data_from_header.rb', line 7

def call
  # try to find the SentEmailData by the following methods, listed in order of preference:
  # 1) the Message-ID (in which we stored our own SentEmailData id in the first place);
  # 2) the provider_message_id which Sendgrid or SES uses to track emails;
  # 3) recipient email addresses to which we recently sent out emails

  unless uuid_from_smtp_message_id.blank?
    sent_email = EmailEvents::SentEmailData.find_by_uuid!(uuid_from_smtp_message_id)

    # if this event gives us our Message-ID and Sendgrid's sg_message_id, we take the opportunity to store
    # the latter, as other events (foremost, "open" events) don't necessarily provide us with the Message-ID again
    if sent_email.provider_message_id.blank? && !self.event_data.provider_message_id.blank?
      sent_email.update_attribute(:provider_message_id, self.event_data.provider_message_id)
    end

    # the UUID is always associated with just one original message
    return [sent_email]
  end

  unless self.event_data.provider_message_id.blank?
    sent_email = EmailEvents::SentEmailData.where(provider_message_id: self.event_data.provider_message_id).first
    return [sent_email] unless sent_email.nil?
  end

  # if the destination mail server has clobbered our tracking data in the message_id, still try to determine
  # the sent email data based on the sender's email address and any emails sent to it in the last 15 minutes.
  # We only do this for bounces and drops, as it's safe to assume that a bounce and drop event should apply
  # to ALL outstanding sent emails -- as opposed to eg. click and open events which are tightly associated with one
  # sent email)
  if self.event_data.event_type.in?([:bounce, :dropped])
    return EmailEvents::SentEmailData.where('created_at > ? AND "to" = ?', self.event_data.event_timestamp-15.minutes, self.event_data.recipients.first)
  end

  []
end