121 lines
3.5 KiB
Ruby
121 lines
3.5 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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ProcessingError = Class.new(StandardError)
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EmailUnparsableError = Class.new(ProcessingError)
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SentNotificationNotFoundError = Class.new(ProcessingError)
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ProjectNotFound = Class.new(ProcessingError)
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EmptyEmailError = Class.new(ProcessingError)
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AutoGeneratedEmailError = Class.new(ProcessingError)
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UserNotFoundError = Class.new(ProcessingError)
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UserBlockedError = Class.new(ProcessingError)
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UserNotAuthorizedError = Class.new(ProcessingError)
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NoteableNotFoundError = Class.new(ProcessingError)
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InvalidRecordError = Class.new(ProcessingError)
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InvalidNoteError = Class.new(InvalidRecordError)
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InvalidIssueError = Class.new(InvalidRecordError)
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InvalidMergeRequestError = Class.new(InvalidRecordError)
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UnknownIncomingEmail = Class.new(ProcessingError)
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InvalidAttachment = Class.new(ProcessingError)
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class Receiver
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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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mail = build_mail
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ignore_auto_reply!(mail)
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mail_key = extract_mail_key(mail)
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handler = Handler.for(mail, mail_key)
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raise UnknownIncomingEmail unless handler
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handler.execute.tap do
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Gitlab::Metrics.add_event(handler.metrics_event, handler.metrics_params)
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end
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end
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private
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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 extract_mail_key(mail)
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key_from_to_header(mail) || key_from_additional_headers(mail)
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end
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def key_from_to_header(mail)
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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(mail)
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find_key_from_references(mail) ||
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find_key_from_delivered_to_header(mail)
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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(mail)
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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 find_key_from_delivered_to_header(mail)
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Array(mail[: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 ignore_auto_reply!(mail)
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if auto_submitted?(mail) || auto_replied?(mail)
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raise AutoGeneratedEmailError
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end
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end
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def auto_submitted?(mail)
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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?(mail)
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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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