require_dependency 'gitlab/email/handler' # Inspired in great part by Discourse's Email::Receiver module Gitlab module Email ProcessingError = Class.new(StandardError) EmailUnparsableError = Class.new(ProcessingError) SentNotificationNotFoundError = Class.new(ProcessingError) ProjectNotFound = Class.new(ProcessingError) EmptyEmailError = Class.new(ProcessingError) AutoGeneratedEmailError = Class.new(ProcessingError) UserNotFoundError = Class.new(ProcessingError) UserBlockedError = Class.new(ProcessingError) UserNotAuthorizedError = Class.new(ProcessingError) NoteableNotFoundError = Class.new(ProcessingError) InvalidRecordError = Class.new(ProcessingError) InvalidNoteError = Class.new(InvalidRecordError) InvalidIssueError = Class.new(InvalidRecordError) InvalidMergeRequestError = Class.new(InvalidRecordError) UnknownIncomingEmail = Class.new(ProcessingError) class Receiver def initialize(raw) @raw = raw end def execute raise EmptyEmailError if @raw.blank? mail = build_mail ignore_auto_submitted!(mail) mail_key = extract_mail_key(mail) handler = Handler.for(mail, mail_key) raise UnknownIncomingEmail unless handler Gitlab::Metrics.add_event(:receive_email, handler.metrics_params) handler.execute end private def build_mail Mail::Message.new(@raw) rescue Encoding::UndefinedConversionError, Encoding::InvalidByteSequenceError => e raise EmailUnparsableError, e end def extract_mail_key(mail) key_from_to_header(mail) || key_from_additional_headers(mail) end def key_from_to_header(mail) mail.to.find do |address| key = Gitlab::IncomingEmail.key_from_address(address) break key if key end end def key_from_additional_headers(mail) find_key_from_references(mail) || find_key_from_delivered_to_header(mail) end def ensure_references_array(references) case references when Array references when String # Handle emails from clients which append with commas, # example clients are Microsoft exchange and iOS app Gitlab::IncomingEmail.scan_fallback_references(references) when nil [] end end def find_key_from_references(mail) ensure_references_array(mail.references).find do |mail_id| key = Gitlab::IncomingEmail.key_from_fallback_message_id(mail_id) break key if key end end def find_key_from_delivered_to_header(mail) Array(mail[:delivered_to]).find do |header| key = Gitlab::IncomingEmail.key_from_address(header.value) break key if key end end def ignore_auto_submitted!(mail) # Mail::Header#[] is case-insensitive auto_submitted = mail.header['Auto-Submitted']&.value # Mail::Field#value would strip leading and trailing whitespace raise AutoGeneratedEmailError if # See also https://tools.ietf.org/html/rfc3834 auto_submitted && auto_submitted != 'no' end end end end