156 lines
3.9 KiB
Ruby
156 lines
3.9 KiB
Ruby
# frozen_string_literal: true
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require_dependency 'gitlab/email/handler'
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# Inspired in great part by Discourse's Email::Receiver
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module Gitlab
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module Email
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class Receiver
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include Gitlab::Utils::StrongMemoize
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def initialize(raw)
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@raw = raw
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end
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def execute
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raise EmptyEmailError if @raw.blank?
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ignore_auto_reply!
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raise UnknownIncomingEmail unless handler
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handler.execute.tap do
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Gitlab::Metrics::BackgroundTransaction.current&.add_event(handler.metrics_event, handler.metrics_params)
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end
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end
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def mail_metadata
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{
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mail_uid: mail.message_id,
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from_address: mail.from,
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to_address: mail.to,
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mail_key: mail_key,
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references: Array(mail.references),
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delivered_to: delivered_to.map(&:value),
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envelope_to: envelope_to.map(&:value),
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x_envelope_to: x_envelope_to.map(&:value)
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}
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end
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private
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def handler
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strong_memoize(:handler) { find_handler }
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end
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def find_handler
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Handler.for(mail, mail_key)
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end
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def mail
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strong_memoize(:mail) { build_mail }
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end
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def build_mail
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Mail::Message.new(@raw)
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rescue Encoding::UndefinedConversionError,
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Encoding::InvalidByteSequenceError => e
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raise EmailUnparsableError, e
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end
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def mail_key
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strong_memoize(:mail_key) do
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key_from_to_header || key_from_additional_headers
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end
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end
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def key_from_to_header
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mail.to.find do |address|
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key = Gitlab::IncomingEmail.key_from_address(address)
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break key if key
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end
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end
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def key_from_additional_headers
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find_key_from_references ||
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find_key_from_delivered_to_header ||
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find_key_from_envelope_to_header ||
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find_key_from_x_envelope_to_header
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end
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def ensure_references_array(references)
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case references
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when Array
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references
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when String
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# Handle emails from clients which append with commas,
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# example clients are Microsoft exchange and iOS app
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Gitlab::IncomingEmail.scan_fallback_references(references)
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when nil
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[]
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end
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end
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def find_key_from_references
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ensure_references_array(mail.references).find do |mail_id|
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key = Gitlab::IncomingEmail.key_from_fallback_message_id(mail_id)
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break key if key
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end
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end
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def delivered_to
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Array(mail[:delivered_to])
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end
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def envelope_to
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Array(mail[:envelope_to])
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end
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def x_envelope_to
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Array(mail[:x_envelope_to])
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end
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def find_key_from_delivered_to_header
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delivered_to.find do |header|
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key = Gitlab::IncomingEmail.key_from_address(header.value)
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break key if key
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end
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end
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def find_key_from_envelope_to_header
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envelope_to.find do |header|
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key = Gitlab::IncomingEmail.key_from_address(header.value)
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break key if key
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end
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end
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def find_key_from_x_envelope_to_header
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x_envelope_to.find do |header|
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key = Gitlab::IncomingEmail.key_from_address(header.value)
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break key if key
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end
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end
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def ignore_auto_reply!
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if auto_submitted? || auto_replied?
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raise AutoGeneratedEmailError
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end
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end
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def auto_submitted?
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# Mail::Header#[] is case-insensitive
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auto_submitted = mail.header['Auto-Submitted']&.value
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# Mail::Field#value would strip leading and trailing whitespace
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# See also https://tools.ietf.org/html/rfc3834
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auto_submitted && auto_submitted != 'no'
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end
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def auto_replied?
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autoreply = mail.header['X-Autoreply']&.value
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autoreply && autoreply == 'yes'
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end
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end
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end
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end
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