414 lines
17 KiB
Ruby
414 lines
17 KiB
Ruby
# frozen_string_literal: true
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require 'net/imap'
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module Imap
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class Sync
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def initialize(group, opts = {})
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@group = group
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@provider = Imap::Providers::Detector.init_with_detected_provider(@group.imap_config)
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connect!
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end
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def connect!
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@provider.connect!
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end
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def disconnect!
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@provider.disconnect!
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end
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def disconnected?
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@provider.disconnected?
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end
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def can_idle?
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SiteSetting.enable_imap_idle && @provider.can?('IDLE')
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end
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def process(idle: false, import_limit: nil, old_emails_limit: nil, new_emails_limit: nil)
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raise 'disconnected' if disconnected?
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import_limit ||= SiteSetting.imap_batch_import_email
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old_emails_limit ||= SiteSetting.imap_polling_old_emails
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new_emails_limit ||= SiteSetting.imap_polling_new_emails
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# IMAP server -> Discourse (download): discovers updates to old emails
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# (synced emails) and fetches new emails.
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# TODO: Use `Net::IMAP.encode_utf7(@group.imap_mailbox_name)`?
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@status = @provider.open_mailbox(@group.imap_mailbox_name)
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if @status[:uid_validity] != @group.imap_uid_validity
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# If UID validity changes, the whole mailbox must be synchronized (all
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# emails are considered new and will be associated to existent topics
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# in Email::Receiver by matching Message-Ids).
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ImapSyncLog.warn("UIDVALIDITY = #{@status[:uid_validity]} does not match expected #{@group.imap_uid_validity}, invalidating IMAP cache and resyncing emails for mailbox #{@group.imap_mailbox_name}", @group)
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@group.imap_last_uid = 0
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end
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if idle && !can_idle?
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ImapSyncLog.warn("IMAP server for group cannot IDLE or imap idle site setting is disabled", @group)
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idle = false
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end
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if idle
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raise 'IMAP IDLE is disabled' if !SiteSetting.enable_imap_idle
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# Thread goes into sleep and it is better to return any connection
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# back to the pool.
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ActiveRecord::Base.connection_handler.clear_active_connections!
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idle_polling_mins = SiteSetting.imap_polling_period_mins.minutes.to_i
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ImapSyncLog.debug("Going IDLE for #{idle_polling_mins} seconds to wait for more work", @group, db: false)
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@provider.imap.idle(idle_polling_mins) do |resp|
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if resp.kind_of?(Net::IMAP::UntaggedResponse) && resp.name == 'EXISTS'
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@provider.imap.idle_done
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end
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end
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end
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# Fetching UIDs of old (already imported into Discourse, but might need
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# update) and new (not downloaded yet) emails.
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if @group.imap_last_uid == 0
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old_uids = []
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new_uids = @provider.uids
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else
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old_uids = @provider.uids(to: @group.imap_last_uid) # 1 .. seen
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new_uids = @provider.uids(from: @group.imap_last_uid + 1) # seen+1 .. inf
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end
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# Sometimes, new_uids contains elements from old_uids.
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new_uids = new_uids - old_uids
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ImapSyncLog.debug("Remote email server has #{old_uids.size} old emails and #{new_uids.size} new emails", @group)
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all_old_uids_size = old_uids.size
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all_new_uids_size = new_uids.size
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@group.update_columns(
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imap_last_error: nil,
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imap_old_emails: all_old_uids_size,
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imap_new_emails: all_new_uids_size
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)
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import_mode = import_limit > -1 && new_uids.size > import_limit
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old_uids = old_uids.sample(old_emails_limit).sort! if old_emails_limit > -1
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new_uids = new_uids[0..new_emails_limit - 1] if new_emails_limit > 0
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# if there are no old_uids that is OK, this could indicate that some
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# UIDs have been sent to the trash
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process_old_uids(old_uids)
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if new_uids.present?
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process_new_uids(new_uids, import_mode, all_old_uids_size, all_new_uids_size)
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end
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# Discourse -> IMAP server (upload): syncs updated flags and labels.
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sync_to_server
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{ remaining: all_new_uids_size - new_uids.size }
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end
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def update_topic(email, incoming_email, opts = {})
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return if !incoming_email ||
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incoming_email.imap_sync ||
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!incoming_email.topic ||
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incoming_email.post&.post_number != 1
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update_topic_archived_state(email, incoming_email, opts)
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update_topic_tags(email, incoming_email, opts)
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end
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private
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def process_old_uids(old_uids)
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ImapSyncLog.debug("Syncing #{old_uids.size} randomly-selected old emails", @group)
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emails = old_uids.empty? ? [] : @provider.emails(old_uids, ['UID', 'FLAGS', 'LABELS', 'ENVELOPE'])
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emails.each do |email|
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incoming_email = IncomingEmail.find_by(
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imap_uid_validity: @status[:uid_validity],
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imap_uid: email['UID'],
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imap_group_id: @group.id
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)
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if incoming_email.present?
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update_topic(email, incoming_email, mailbox_name: @group.imap_mailbox_name)
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else
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# try finding email by message-id instead, we may be able to set the uid etc.
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incoming_email = IncomingEmail.where(
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message_id: Email.message_id_clean(email['ENVELOPE'].message_id),
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imap_uid: nil,
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imap_uid_validity: nil
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).where("to_addresses LIKE '%#{@group.email_username}%'").first
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if incoming_email
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incoming_email.update(
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imap_uid_validity: @status[:uid_validity],
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imap_uid: email['UID'],
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imap_group_id: @group.id
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)
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update_topic(email, incoming_email, mailbox_name: @group.imap_mailbox_name)
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else
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ImapSyncLog.warn("Could not find old email (UIDVALIDITY = #{@status[:uid_validity]}, UID = #{email['UID']})", @group)
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end
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end
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end
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handle_missing_uids(old_uids)
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end
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def handle_missing_uids(old_uids)
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# If there are any UIDs for the mailbox missing from old_uids, this means they have been moved
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# to some other mailbox in the mail server. They could be possibly deleted. first we can check
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# if they have been deleted and if so delete the associated post/topic. then the remaining we
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# can just remove the imap details from the IncomingEmail table and if they end up back in the
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# original mailbox then they will be picked up in a future resync.
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existing_incoming = IncomingEmail.includes(:post).where(
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imap_group_id: @group.id, imap_uid_validity: @status[:uid_validity]
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).where.not(imap_uid: nil)
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existing_uids = existing_incoming.map(&:imap_uid)
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missing_uids = existing_uids - old_uids
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missing_message_ids = existing_incoming.select do |incoming|
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missing_uids.include?(incoming.imap_uid)
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end.map(&:message_id)
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return if missing_message_ids.empty?
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# This can be done because Message-ID is unique on a mail server between mailboxes,
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# where the UID will have changed when moving into the Trash mailbox. We need to get
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# the new UID from the trash.
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potential_spam = []
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response = @provider.find_trashed_by_message_ids(missing_message_ids)
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existing_incoming.each do |incoming|
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matching_trashed = response.trashed_emails.find { |email| email.message_id == incoming.message_id }
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if !matching_trashed
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potential_spam << incoming
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next
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end
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# if we deleted the topic/post ourselves in discourse then the post will
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# not exist, and this sync is just updating the old UIDs to the new ones
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# in the trash, and we don't need to re-destroy the post
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if incoming.post
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ImapSyncLog.debug("Deleting post ID #{incoming.post_id}, topic id #{incoming.topic_id}; email has been deleted on the IMAP server.", @group)
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PostDestroyer.new(Discourse.system_user, incoming.post).destroy
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end
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# the email has moved mailboxes, we don't want to try trashing again next time
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ImapSyncLog.debug("Updating incoming ID #{incoming.id} uid data FROM [UID #{incoming.imap_uid} | UIDVALIDITY #{incoming.imap_uid_validity}] TO [UID #{matching_trashed.uid} | UIDVALIDITY #{response.trash_uid_validity}] (TRASHED)", @group)
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incoming.update(imap_uid_validity: response.trash_uid_validity, imap_uid: matching_trashed.uid)
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end
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# This can be done because Message-ID is unique on a mail server between mailboxes,
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# where the UID will have changed when moving into the Trash mailbox. We need to get
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# the new UID from the spam.
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response = @provider.find_spam_by_message_ids(missing_message_ids)
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potential_spam.each do |incoming|
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matching_spam = response.spam_emails.find { |email| email.message_id == incoming.message_id }
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# if the email is not in the trash or spam then we don't know where it is... could
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# be in any mailbox on the server or could be permanently deleted.
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if !matching_spam
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ImapSyncLog.debug("Email for incoming ID #{incoming.id} (#{incoming.message_id}) could not be found in the group mailbox, trash, or spam. It could be in another mailbox or permanently deleted.", @group)
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incoming.update(imap_missing: true)
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next
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end
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# if we deleted the topic/post ourselves in discourse then the post will
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# not exist, and this sync is just updating the old UIDs to the new ones
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# in the spam, and we don't need to re-destroy the post
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if incoming.post
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ImapSyncLog.debug("Deleting post ID #{incoming.post_id}, topic id #{incoming.topic_id}; email has been moved to spam on the IMAP server.", @group)
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PostDestroyer.new(Discourse.system_user, incoming.post).destroy
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end
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# the email has moved mailboxes, we don't want to try marking as spam again next time
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ImapSyncLog.debug("Updating incoming ID #{incoming.id} uid data FROM [UID #{incoming.imap_uid} | UIDVALIDITY #{incoming.imap_uid_validity}] TO [UID #{matching_spam.uid} | UIDVALIDITY #{response.spam_uid_validity}] (SPAM)", @group)
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incoming.update(imap_uid_validity: response.spam_uid_validity, imap_uid: matching_spam.uid)
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end
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end
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def process_new_uids(new_uids, import_mode, all_old_uids_size, all_new_uids_size)
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ImapSyncLog.debug("Syncing #{new_uids.size} new emails (oldest first)", @group)
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emails = @provider.emails(new_uids, ['UID', 'FLAGS', 'LABELS', 'RFC822'])
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processed = 0
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# TODO (maybe): We might need something here to exclusively handle
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# the UID of the incoming email, so we don't end up with a race condition
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# where the same UID is handled multiple times before the group imap_X
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# columns are updated.
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emails.each do |email|
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# Synchronously process emails because the order of emails matter
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# (for example replies must be processed after the original email
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# to have a topic where the reply can be posted).
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begin
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receiver = Email::Receiver.new(
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email['RFC822'],
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allow_auto_generated: true,
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import_mode: import_mode,
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destinations: [@group],
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imap_uid_validity: @status[:uid_validity],
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imap_uid: email['UID'],
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imap_group_id: @group.id,
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source: :imap
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)
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receiver.process!
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update_topic(email, receiver.incoming_email, mailbox_name: @group.imap_mailbox_name)
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rescue Email::Receiver::ProcessingError => e
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ImapSyncLog.warn("Could not process (UIDVALIDITY = #{@status[:uid_validity]}, UID = #{email['UID']}): #{e.message}", @group)
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end
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processed += 1
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@group.update_columns(
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imap_uid_validity: @status[:uid_validity],
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imap_last_uid: email['UID'],
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imap_old_emails: all_old_uids_size + processed,
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imap_new_emails: all_new_uids_size - processed
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)
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end
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end
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def sync_to_server
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return if !SiteSetting.enable_imap_write
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to_sync = IncomingEmail.where(imap_sync: true, imap_group_id: @group.id)
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if to_sync.size > 0
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@provider.open_mailbox(@group.imap_mailbox_name, write: true)
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to_sync.each do |incoming_email|
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ImapSyncLog.debug("Updating email on IMAP server for incoming email ID = #{incoming_email.id}, UID = #{incoming_email.imap_uid}", @group)
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update_email(incoming_email)
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incoming_email.update(imap_sync: false)
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end
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end
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end
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def update_topic_archived_state(email, incoming_email, opts = {})
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topic = incoming_email.topic
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topic_is_archived = topic.group_archived_messages.size > 0
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email_is_archived = !email['LABELS'].include?('\\Inbox') && !email['LABELS'].include?('INBOX')
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if topic_is_archived && !email_is_archived
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ImapSyncLog.debug("Unarchiving topic ID #{topic.id}, email was unarchived", @group)
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GroupArchivedMessage.move_to_inbox!(@group.id, topic, skip_imap_sync: true)
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elsif !topic_is_archived && email_is_archived
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ImapSyncLog.debug("Archiving topic ID #{topic.id}, email was archived", @group)
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GroupArchivedMessage.archive!(@group.id, topic, skip_imap_sync: true)
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end
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end
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def update_topic_tags(email, incoming_email, opts = {})
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group_email_regex = @group.email_username_regex
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topic = incoming_email.topic
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tags = Set.new
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# "Plus" part from the destination email address
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to_addresses = incoming_email.to_addresses_split
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cc_addresses = incoming_email.cc_addresses_split
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(to_addresses + cc_addresses).each do |address|
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if plus_part = address&.scan(group_email_regex)&.first&.first
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tags.add("plus:#{plus_part[1..-1]}") if plus_part.length > 0
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end
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end
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# Mailbox name
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tags.add(@provider.to_tag(opts[:mailbox_name])) if opts[:mailbox_name]
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# Flags and labels
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email['FLAGS'].each { |flag| tags.add(@provider.to_tag(flag)) }
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email['LABELS'].each { |label| tags.add(@provider.to_tag(label)) }
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tags.subtract([nil, ''])
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return if !tagging_enabled?
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# TODO: Optimize tagging.
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# `DiscourseTagging.tag_topic_by_names` does a lot of lookups in the
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# database and some of them could be cached in this context.
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DiscourseTagging.tag_topic_by_names(topic, Guardian.new(Discourse.system_user), tags.to_a)
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end
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def update_email(incoming_email)
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return if !incoming_email || !incoming_email.imap_sync
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post = incoming_email.post
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if !post && incoming_email.post_id
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# post was likely deleted because topic was deleted, let's try get it
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post = Post.with_deleted.find(incoming_email.post_id)
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end
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# don't do any of these type of updates on anything but the OP in the
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# email thread -- archiving and deleting will be handled for the whole
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# thread depending on provider
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return if post&.post_number != 1
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topic = incoming_email.topic
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# if email is nil, the UID does not exist in the provider, meaning....
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#
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# A) the email has been deleted/moved to a different mailbox in the provider
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# B) the UID does not belong to the provider
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email = @provider.emails(incoming_email.imap_uid, ['FLAGS', 'LABELS']).first
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return if !email.present?
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labels = email['LABELS']
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flags = email['FLAGS']
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new_labels = []
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new_flags = []
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# Topic has been deleted if it is not present from the post, so we need
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# to trash the IMAP server email
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if !topic
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# no need to do anything further here, we will recognize the UIDs in the
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# mail server email thread have been trashed on next sync
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ImapSyncLog.debug("Trashing UID #{incoming_email.imap_uid} (incoming ID #{incoming_email.id})", @group)
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return @provider.trash(incoming_email.imap_uid)
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end
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# the topic is archived, and the archive should be reflected in the IMAP
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# server
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topic_archived = topic.group_archived_messages.any?
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if !topic_archived
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# TODO: This is needed right now so the store below does not take it
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# away again...ideally we should unarchive and store the tag-labels
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# at the same time.
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new_labels << "\\Inbox"
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ImapSyncLog.debug("Unarchiving UID #{incoming_email.imap_uid} (incoming ID #{incoming_email.id})", @group)
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# some providers need special handling for unarchiving too
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@provider.unarchive(incoming_email.imap_uid)
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else
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ImapSyncLog.debug("Archiving UID #{incoming_email.imap_uid} (incoming ID #{incoming_email.id})", @group)
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# some providers need special handling for archiving. this way we preserve
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# any new tag-labels, and archive, even though it may cause extra requests
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# to the IMAP server
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@provider.archive(incoming_email.imap_uid)
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end
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# Sync topic status and labels with email flags and labels.
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if tagging_enabled?
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tags = topic.tags.pluck(:name)
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new_flags = tags.map { |tag| @provider.tag_to_flag(tag) }.reject(&:blank?)
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new_labels = new_labels.concat(tags.map { |tag| @provider.tag_to_label(tag) }.reject(&:blank?))
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end
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# regardless of whether the topic needs to be archived we still update
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# the flags and the labels
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@provider.store(incoming_email.imap_uid, 'FLAGS', flags, new_flags)
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@provider.store(incoming_email.imap_uid, 'LABELS', labels, new_labels)
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end
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def tagging_enabled?
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SiteSetting.tagging_enabled && SiteSetting.allow_staff_to_tag_pms
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end
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end
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end
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