discourse/lib/email/processor.rb

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# frozen_string_literal: true
module Email
class Processor
attr_reader :receiver
def initialize(mail, opts = {})
@mail = mail
@opts = opts
end
def self.process!(mail, opts = {})
Email::Processor.new(mail, opts).process!
end
def process!
begin
@receiver = Email::Receiver.new(@mail, @opts)
@receiver.process!
rescue RateLimiter::LimitExceeded
@opts[:retry_on_rate_limit] ? Jobs.enqueue(:process_email, mail: @mail, source: @opts[:source]) : raise
rescue => e
return handle_bounce(e) if @receiver.is_bounce?
log_email_process_failure(@mail, e)
incoming_email = @receiver.try(:incoming_email)
rejection_message = handle_failure(@mail, e)
if rejection_message.present?
set_incoming_email_rejection_message(incoming_email, rejection_message.body.to_s)
end
end
end
private
def handle_bounce(e)
# never reply to bounced emails
log_email_process_failure(@mail, e)
set_incoming_email_rejection_message(@receiver.incoming_email, I18n.t("emails.incoming.errors.bounced_email_error"))
end
def handle_failure(mail_string, e)
message_template = case e
when Email::Receiver::NoSenderDetectedError then return nil
when Email::Receiver::FromReplyByAddressError then return nil
when Email::Receiver::EmptyEmailError then :email_reject_empty
when Email::Receiver::NoBodyDetectedError then :email_reject_empty
when Email::Receiver::UserNotFoundError then :email_reject_user_not_found
when Email::Receiver::ScreenedEmailError then :email_reject_screened_email
when Email::Receiver::EmailNotAllowed then :email_reject_not_allowed_email
when Email::Receiver::AutoGeneratedEmailError then :email_reject_auto_generated
when Email::Receiver::InactiveUserError then :email_reject_inactive_user
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when Email::Receiver::SilencedUserError then :email_reject_silenced_user
when Email::Receiver::BadDestinationAddress then :email_reject_bad_destination_address
when Email::Receiver::StrangersNotAllowedError then :email_reject_strangers_not_allowed
when Email::Receiver::InsufficientTrustLevelError then :email_reject_insufficient_trust_level
when Email::Receiver::ReplyUserNotMatchingError then :email_reject_reply_user_not_matching
when Email::Receiver::TopicNotFoundError then :email_reject_topic_not_found
when Email::Receiver::TopicClosedError then :email_reject_topic_closed
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when Email::Receiver::InvalidPost then :email_reject_invalid_post
when Email::Receiver::TooShortPost then :email_reject_post_too_short
when Email::Receiver::UnsubscribeNotAllowed then :email_reject_invalid_post
when ActiveRecord::Rollback then :email_reject_invalid_post
when Email::Receiver::InvalidPostAction then :email_reject_invalid_post_action
when Discourse::InvalidAccess then :email_reject_invalid_access
when Email::Receiver::OldDestinationError then :email_reject_old_destination
when Email::Receiver::ReplyNotAllowedError then :email_reject_reply_not_allowed
when Email::Receiver::ReplyToDigestError then :email_reject_reply_to_digest
else :email_reject_unrecognized_error
end
template_args = {}
client_message = nil
# there might be more information available in the exception
if message_template == :email_reject_invalid_post && e.message.size > 6
message_template = :email_reject_invalid_post_specified
template_args[:post_error] = e.message
end
if message_template == :email_reject_post_too_short
template_args[:count] = SiteSetting.min_post_length
end
if message_template == :email_reject_unrecognized_error
msg = "Unrecognized error type (#{e.class}: #{e.message}) when processing incoming email"
msg += "\n\nBacktrace:\n#{e.backtrace.map { |l| " #{l}" }.join("\n")}"
msg += "\n\nMail:\n#{mail_string}"
Rails.logger.error(msg)
end
if message_template == :email_reject_old_destination
template_args[:short_url] = e.message
template_args[:number_of_days] = SiteSetting.disallow_reply_by_email_after_days
end
if message_template
# inform the user about the rejection
message = Mail::Message.new(mail_string)
template_args[:former_title] = message.subject
template_args[:destination] = message.to
template_args[:site_name] = SiteSetting.title
client_message = RejectionMailer.send_rejection(message_template, message.from, template_args)
# only send one rejection email per day to the same email address
if can_send_rejection_email?(message.from, message_template)
Email::Sender.new(client_message, message_template).send
end
end
client_message
end
def can_send_rejection_email?(email, type)
return false if @receiver.sent_to_mailinglist_mirror?
return true if type == :email_reject_unrecognized_error
key = "rejection_email:#{email}:#{type}:#{Date.today}"
if Discourse.redis.setnx(key, "1")
Discourse.redis.expire(key, 25.hours)
true
else
false
end
end
def set_incoming_email_rejection_message(incoming_email, message)
if incoming_email
incoming_email.update!(
rejection_message: message,
raw: Email::Cleaner.new(incoming_email.raw, rejected: true).execute
)
end
end
def log_email_process_failure(mail_string, exception)
if SiteSetting.log_mail_processing_failures
Rails.logger.warn("Email can not be processed: #{exception}\n\n#{mail_string}")
end
end
end
end