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108 lines
3.8 KiB
Ruby
108 lines
3.8 KiB
Ruby
# frozen_string_literal: true
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module Email
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##
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# Email Message-IDs are used in both our outbound and inbound email
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# flow. For the outbound flow via Email::Sender, we assign a unique
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# Message-ID for any emails sent out from the application.
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# If we are sending an email related to a topic, such as through the
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# PostAlerter class, then the Message-ID will contain references to
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# the topic ID, and if it is for a specific post, the post ID,
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# along with a random suffix to make the Message-ID truly unique.
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# The host must also be included on the Message-IDs.
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#
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# For the inbound email flow via Email::Receiver, we use Message-IDs
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# to discern which topic or post the inbound email reply should be
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# in response to. In this case, the Message-ID is extracted from the
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# References and/or In-Reply-To headers, and compared with either
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# the IncomingEmail table, the Post table, or the IncomingEmail to
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# determine where to send the reply.
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#
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# See https://datatracker.ietf.org/doc/html/rfc2822#section-3.6.4 for
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# more specific information around Message-IDs in email.
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#
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# See https://tools.ietf.org/html/rfc850#section-2.1.7 for the
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# Message-ID format specification.
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class MessageIdService
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class << self
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def generate_default
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"<#{SecureRandom.uuid}@#{host}>"
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end
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def generate_for_post(post, use_incoming_email_if_present: false)
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if use_incoming_email_if_present && post.incoming_email&.message_id.present?
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return "<#{post.incoming_email.message_id}>"
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end
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"<topic/#{post.topic_id}/#{post.id}.#{random_suffix}@#{host}>"
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end
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def generate_for_topic(topic, use_incoming_email_if_present: false, canonical: false)
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first_post = topic.ordered_posts.first
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if use_incoming_email_if_present && first_post.incoming_email&.message_id.present?
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return "<#{first_post.incoming_email.message_id}>"
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end
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if canonical
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"<topic/#{topic.id}@#{host}>"
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else
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"<topic/#{topic.id}.#{random_suffix}@#{host}>"
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end
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end
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def find_post_from_message_ids(message_ids)
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message_ids = message_ids.map { |message_id| message_id_clean(message_id) }
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post_ids = message_ids.map { |message_id| message_id[message_id_post_id_regexp, 1] }.compact.map(&:to_i)
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post_ids << Post.where(
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topic_id: message_ids.map { |message_id| message_id[message_id_topic_id_regexp, 1] }.compact,
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post_number: 1
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).pluck(:id)
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post_ids << EmailLog.where(message_id: message_ids).pluck(:post_id)
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post_ids << IncomingEmail.where(message_id: message_ids).pluck(:post_id)
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post_ids.flatten!
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post_ids.compact!
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post_ids.uniq!
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return if post_ids.empty?
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Post.where(id: post_ids).order(:created_at).last
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end
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def random_suffix
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SecureRandom.hex(12)
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end
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def discourse_generated_message_id?(message_id)
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!!(message_id =~ message_id_post_id_regexp) ||
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!!(message_id =~ message_id_topic_id_regexp)
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end
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def message_id_post_id_regexp
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Regexp.new "topic/\\d+/(\\d+|\\d+\.\\w+)@#{Regexp.escape(host)}"
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end
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def message_id_topic_id_regexp
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Regexp.new "topic/(\\d+|\\d+\.\\w+)@#{Regexp.escape(host)}"
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end
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def message_id_rfc_format(message_id)
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message_id.present? && !is_message_id_rfc?(message_id) ? "<#{message_id}>" : message_id
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end
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def message_id_clean(message_id)
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message_id.present? && is_message_id_rfc?(message_id) ? message_id.gsub(/^<|>$/, "") : message_id
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end
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def is_message_id_rfc?(message_id)
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message_id.start_with?('<') && message_id.include?('@') && message_id.end_with?('>')
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end
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def host
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Email::Sender.host_for(Discourse.base_url)
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end
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end
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end
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end
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