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5cd733a334
This also adds a new column, message_checksum, to the action_mailbox_inbound_emails table for storing SHA1 digest of the email source. Additionally, it makes generating the missing message id deterministic and adds a unique index on message_checksum and message_id to detect duplicate emails.
38 lines
1.7 KiB
Ruby
38 lines
1.7 KiB
Ruby
# frozen_string_literal: true
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# The +Message-ID+ as specified by rfc822 is supposed to be a unique identifier for that individual email.
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# That makes it an ideal tracking token for debugging and forensics, just like +X-Request-Id+ does for
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# web request.
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#
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# If an inbound email does not, against the rfc822 mandate, specify a Message-ID, one will be generated
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# using the approach from <tt>Mail::MessageIdField</tt>.
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module ActionMailbox::InboundEmail::MessageId
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extend ActiveSupport::Concern
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class_methods do
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# Create a new +InboundEmail+ from the raw +source+ of the email, which be uploaded as a Active Storage
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# attachment called +raw_email+. Before the upload, extract the Message-ID from the +source+ and set
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# it as an attribute on the new +InboundEmail+.
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def create_and_extract_message_id!(source, **options)
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message_checksum = Digest::SHA1.hexdigest(source)
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message_id = extract_message_id(source) || generate_missing_message_id(message_checksum)
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create! options.merge(message_id: message_id, message_checksum: message_checksum) do |inbound_email|
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inbound_email.raw_email.attach io: StringIO.new(source), filename: "message.eml", content_type: "message/rfc822"
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end
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rescue ActiveRecord::RecordNotUnique
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nil
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end
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private
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def extract_message_id(source)
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Mail.from_source(source).message_id rescue nil
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end
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def generate_missing_message_id(message_checksum)
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Mail::MessageIdField.new("<#{message_checksum}@#{::Socket.gethostname}.mail>").message_id.tap do |message_id|
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logger.warn "Message-ID couldn't be parsed or is missing. Generated a new Message-ID: #{message_id}"
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end
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end
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end
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end
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