discourse/app/services/post_alerter.rb

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# frozen_string_literal: true
class PostAlerter
USER_BATCH_SIZE = 100
def self.post_created(post, opts = {})
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PostAlerter.new(opts).after_save_post(post, true)
post
end
def initialize(default_opts = {})
@default_opts = default_opts
end
def not_allowed?(user, post)
user.blank? ||
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user.bot? ||
user.id == post.user_id
end
def all_allowed_users(post)
@all_allowed_users ||= post.topic.all_allowed_users.reject { |u| not_allowed?(u, post) }
end
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def allowed_users(post)
@allowed_users ||= post.topic.allowed_users.reject { |u| not_allowed?(u, post) }
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end
def allowed_group_users(post)
@allowed_group_users ||= post.topic.allowed_group_users.reject { |u| not_allowed?(u, post) }
end
def directly_targeted_users(post)
allowed_users(post) - allowed_group_users(post)
end
def indirectly_targeted_users(post)
allowed_group_users(post)
end
def only_allowed_users(users, post)
return users unless post.topic.private_message?
users.select { |u| all_allowed_users(post).include?(u) }
end
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def notify_about_reply?(post)
# small actions can be whispers in this case they will have an action code
# we never want to notify on this
post.post_type == Post.types[:regular] ||
(post.post_type == Post.types[:whisper] && post.action_code.nil?)
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end
def after_save_post(post, new_record = false)
notified = [post.user, post.last_editor].uniq
# mentions (users/groups)
mentioned_groups, mentioned_users = extract_mentions(post)
if mentioned_groups || mentioned_users
mentioned_opts = {}
editor = post.last_editor
if post.last_editor_id != post.user_id
# Mention comes from an edit by someone else, so notification should say who added the mention.
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mentioned_opts = { user_id: editor.id, original_username: editor.username, display_username: editor.username }
end
expand_group_mentions(mentioned_groups, post) do |group, users|
users = only_allowed_users(users, post)
notified += notify_users(users - notified, :group_mentioned, post, mentioned_opts.merge(group: group))
end
if mentioned_users
mentioned_users = only_allowed_users(mentioned_users, post)
notified += notify_users(mentioned_users - notified, :mentioned, post, mentioned_opts)
end
end
# replies
reply_to_user = post.reply_notification_target
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if new_record && reply_to_user && !notified.include?(reply_to_user) && notify_about_reply?(post)
notified += notify_non_pm_users(reply_to_user, :replied, post)
end
# quotes
quoted_users = extract_quoted_users(post)
notified += notify_non_pm_users(quoted_users - notified, :quoted, post)
# linked
linked_users = extract_linked_users(post)
notified += notify_non_pm_users(linked_users - notified, :linked, post)
# private messages
if new_record
if post.topic.private_message?
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notify_pm_users(post, reply_to_user, notified)
elsif notify_about_reply?(post)
notify_post_users(post, notified)
end
end
sync_group_mentions(post, mentioned_groups)
if new_record && post.post_number == 1
topic = post.topic
if topic.present?
watchers = category_watchers(topic) + tag_watchers(topic) + group_watchers(topic)
notify_first_post_watchers(post, watchers)
end
end
end
def group_watchers(topic)
GroupUser.where(
group_id: topic.allowed_groups.pluck(:group_id),
notification_level: GroupUser.notification_levels[:watching_first_post]
).pluck(:user_id)
end
def tag_watchers(topic)
topic.tag_users
.where(notification_level: TagUser.notification_levels[:watching_first_post])
.pluck(:user_id)
end
def category_watchers(topic)
topic.category_users
.where(notification_level: CategoryUser.notification_levels[:watching_first_post])
.pluck(:user_id)
end
def notify_first_post_watchers(post, user_ids)
return if user_ids.blank?
user_ids.uniq!
warn_if_not_sidekiq
# Don't notify the OP
user_ids -= [post.user_id]
users = User.where(id: user_ids)
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DiscourseEvent.trigger(:before_create_notifications_for_users, users, post)
each_user_in_batches(users) do |user|
create_notification(user, Notification.types[:watching_first_post], post)
end
end
def sync_group_mentions(post, mentioned_groups)
GroupMention.where(post_id: post.id).destroy_all
return if mentioned_groups.blank?
mentioned_groups.each do |group|
GroupMention.create(post_id: post.id, group_id: group.id)
end
end
def unread_posts(user, topic)
Post.secured(Guardian.new(user))
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.where('post_number > COALESCE((
SELECT last_read_post_number FROM topic_users tu
WHERE tu.user_id = ? AND tu.topic_id = ? ),0)',
user.id, topic.id)
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.where('reply_to_user_id = ? OR exists(
SELECT 1 from topic_users tu
WHERE tu.user_id = ? AND
tu.topic_id = ? AND
notification_level = ?
)', user.id, user.id, topic.id, TopicUser.notification_levels[:watching])
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.where(topic_id: topic.id)
end
def first_unread_post(user, topic)
unread_posts(user, topic).order('post_number').first
end
def unread_count(user, topic)
unread_posts(user, topic).count
end
def destroy_notifications(user, types, topic)
return if user.blank?
return unless Guardian.new(user).can_see?(topic)
User.transaction do
user.notifications.where(
notification_type: types,
topic_id: topic.id
).destroy_all
# Reload so notification counts sync up correctly
user.reload
end
end
NOTIFIABLE_TYPES = [:mentioned, :replied, :quoted, :posted, :linked, :private_message, :group_mentioned, :watching_first_post].map { |t|
Notification.types[t]
}
def group_stats(topic)
sql = <<~SQL
SELECT COUNT(*) FROM topics t
JOIN topic_allowed_groups g ON g.group_id = :group_id AND g.topic_id = t.id
LEFT JOIN group_archived_messages a ON a.topic_id = t.id AND a.group_id = g.group_id
WHERE a.id IS NULL AND t.deleted_at is NULL AND t.archetype = 'private_message'
SQL
topic.allowed_groups.map do |g|
{
group_id: g.id,
group_name: g.name.downcase,
inbox_count: DB.query_single(sql, group_id: g.id).first.to_i
}
end
end
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def notify_group_summary(user, post)
@group_stats ||= {}
stats = (@group_stats[post.topic_id] ||= group_stats(post.topic))
return unless stats
group_id = post.topic
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.topic_allowed_groups
.where(group_id: user.groups.pluck(:id))
.pluck_first(:group_id)
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stat = stats.find { |s| s[:group_id] == group_id }
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return unless stat && stat[:inbox_count] > 0
notification_type = Notification.types[:group_message_summary]
DistributedMutex.synchronize("group_message_notify_#{user.id}") do
Notification.where(notification_type: notification_type, user_id: user.id).each do |n|
n.destroy if n.data_hash[:group_id] == stat[:group_id]
end
Notification.create(
notification_type: notification_type,
user_id: user.id,
data: {
group_id: stat[:group_id],
group_name: stat[:group_name],
inbox_count: stat[:inbox_count],
username: user.username_lower
}.to_json
)
end
# TODO decide if it makes sense to also publish a desktop notification
end
def should_notify_edit?(notification, post, opts)
notification.data_hash["display_username"] != (opts[:display_username].presence || post.user.username)
end
def should_notify_like?(user, notification)
return true if user.user_option.like_notification_frequency == UserOption.like_notification_frequency_type[:always]
return true if user.user_option.like_notification_frequency == UserOption.like_notification_frequency_type[:first_time_and_daily] && notification.created_at < 1.day.ago
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false
end
def should_notify_previous?(user, post, notification, opts)
case notification.notification_type
when Notification.types[:edited] then should_notify_edit?(notification, post, opts)
when Notification.types[:liked] then should_notify_like?(user, notification)
else false
end
end
COLLAPSED_NOTIFICATION_TYPES ||= [
Notification.types[:replied],
Notification.types[:posted],
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Notification.types[:private_message],
]
def create_notification(user, type, post, opts = {})
opts = @default_opts.merge(opts)
DiscourseEvent.trigger(:before_create_notification, user, type, post, opts)
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return if user.blank? || user.bot?
return if (topic = post.topic).blank?
is_liked = type == Notification.types[:liked]
return if is_liked && user.user_option.like_notification_frequency == UserOption.like_notification_frequency_type[:never]
# Make sure the user can see the post
return unless Guardian.new(user).can_see?(post)
return if user.staged? && topic.category&.mailinglist_mirror?
notifier_id = opts[:user_id] || post.user_id # xxxxx look at revision history
# apply muting here
return if notifier_id && MutedUser.where(user_id: user.id, muted_user_id: notifier_id)
.joins(:muted_user)
.where('NOT admin AND NOT moderator')
.exists?
# apply ignored here
return if notifier_id && IgnoredUser.where(user_id: user.id, ignored_user_id: notifier_id)
.joins(:ignored_user)
.where('NOT admin AND NOT moderator')
.exists?
# skip if muted on the topic
return if TopicUser.where(
topic: topic,
user: user,
notification_level: TopicUser.notification_levels[:muted]
).exists?
# skip if muted on the group
if group = opts[:group]
return if GroupUser.where(
group_id: opts[:group_id],
user_id: user.id,
notification_level: TopicUser.notification_levels[:muted]
).exists?
end
existing_notifications = user.notifications
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.order("notifications.id DESC")
.where(
topic_id: post.topic_id,
post_number: post.post_number
).limit(10)
# Don't notify the same user about the same type of notification on the same post
existing_notification_of_same_type = existing_notifications.find { |n| n.notification_type == type }
return if existing_notification_of_same_type && !should_notify_previous?(user, post, existing_notification_of_same_type, opts)
notification_data = {}
if is_liked &&
existing_notification_of_same_type &&
existing_notification_of_same_type.created_at > 1.day.ago &&
(
user.user_option.like_notification_frequency ==
UserOption.like_notification_frequency_type[:always]
)
data = existing_notification_of_same_type.data_hash
notification_data["username2"] = data["display_username"]
notification_data["count"] = (data["count"] || 1).to_i + 1
# don't use destroy so we don't trigger a notification count refresh
Notification.where(id: existing_notification_of_same_type.id).destroy_all
end
collapsed = false
if COLLAPSED_NOTIFICATION_TYPES.include?(type)
destroy_notifications(user, COLLAPSED_NOTIFICATION_TYPES, topic)
collapsed = true
end
original_post = post
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original_username = opts[:display_username].presence || post.username
if collapsed
post = first_unread_post(user, topic) || post
count = unread_count(user, topic)
if count > 1
I18n.with_locale(user.effective_locale) do
opts[:display_username] = I18n.t('embed.replies', count: count)
end
end
end
UserActionManager.notification_created(original_post, user, type, opts[:acting_user_id])
topic_title = topic.title
# when sending a private message email, keep the original title
if topic.private_message? && modifications = post.revisions.map(&:modifications)
if first_title_modification = modifications.find { |m| m.has_key?("title") }
topic_title = first_title_modification["title"][0]
end
end
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notification_data.merge!(topic_title: topic_title,
original_post_id: original_post.id,
original_post_type: original_post.post_type,
original_username: original_username,
revision_number: opts[:revision_number],
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display_username: opts[:display_username] || post.user.username)
if group = opts[:group]
notification_data[:group_id] = group.id
notification_data[:group_name] = group.name
end
if original_post.via_email && (incoming_email = original_post.incoming_email)
skip_send_email = contains_email_address?(incoming_email.to_addresses, user) ||
contains_email_address?(incoming_email.cc_addresses, user)
else
skip_send_email = opts[:skip_send_email]
end
# Create the notification
created = user.notifications.create!(
notification_type: type,
topic_id: post.topic_id,
post_number: post.post_number,
post_action_id: opts[:post_action_id],
data: notification_data.to_json,
skip_send_email: skip_send_email
)
if created.id && existing_notifications.empty? && NOTIFIABLE_TYPES.include?(type) && !user.suspended?
create_notification_alert(user: user, post: original_post, notification_type: type, username: original_username)
end
created.id ? created : nil
end
def create_notification_alert(user:, post:, notification_type:, excerpt: nil, username: nil)
if post_url = post.url
payload = {
notification_type: notification_type,
post_number: post.post_number,
topic_title: post.topic.title,
topic_id: post.topic.id,
excerpt: excerpt || post.excerpt(400, text_entities: true, strip_links: true, remap_emoji: true),
username: username || post.username,
post_url: post_url
}
DiscourseEvent.trigger(:pre_notification_alert, user, payload)
MessageBus.publish("/notification-alert/#{user.id}", payload, user_ids: [user.id])
push_notification(user, payload)
DiscourseEvent.trigger(:post_notification_alert, user, payload)
end
end
def contains_email_address?(addresses, user)
return false if addresses.blank?
addresses.split(";").include?(user.email)
end
def push_notification(user, payload)
if user.push_subscriptions.exists?
Jobs.enqueue(:send_push_notification, user_id: user.id, payload: payload)
end
if SiteSetting.allow_user_api_key_scopes.split("|").include?("push") && SiteSetting.allowed_user_api_push_urls.present?
clients = user.user_api_keys
.where("('push' = ANY(scopes) OR 'notifications' = ANY(scopes))")
.where("push_url IS NOT NULL AND push_url <> ''")
.where("position(push_url IN ?) > 0", SiteSetting.allowed_user_api_push_urls)
.where("revoked_at IS NULL")
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.pluck(:client_id, :push_url)
if clients.length > 0
Jobs.enqueue(:push_notification, clients: clients, payload: payload, user_id: user.id)
end
end
end
def expand_group_mentions(groups, post)
return unless post.user && groups
Group.mentionable(post.user, include_public: false).where(id: groups.map(&:id)).each do |group|
next if group.user_count >= SiteSetting.max_users_notified_per_group_mention
yield group, group.users
end
end
# TODO: Move to post-analyzer?
def extract_mentions(post)
mentions = post.raw_mentions
return if mentions.blank?
groups = Group.where('LOWER(name) IN (?)', mentions)
mentions -= groups.map(&:name).map(&:downcase)
groups = nil if groups.empty?
if mentions.present?
users = User.where(username_lower: mentions).where.not(id: post.user_id)
users = nil if users.empty?
end
[groups, users]
end
# TODO: Move to post-analyzer?
# Returns a list of users who were quoted in the post
def extract_quoted_users(post)
post.raw.scan(/\[quote=\"([^,]+),.+\"\]/).uniq.map do |m|
User.find_by("username_lower = :username AND id != :id", username: m.first.strip.downcase, id: post.user_id)
end.compact
end
def extract_linked_users(post)
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post.topic_links.where(reflection: false).map do |link|
linked_post = link.link_post
if !linked_post && topic = link.link_topic
linked_post = topic.posts.find_by(post_number: 1)
end
(linked_post && post.user_id != linked_post.user_id && linked_post.user) || nil
end.compact
end
# Notify a bunch of users
def notify_non_pm_users(users, type, post, opts = {})
return [] if post.topic&.private_message?
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notify_users(users, type, post, opts)
end
def notify_users(users, type, post, opts = {})
users = [users] unless users.is_a?(Array)
users.reject!(&:staged?) if post.topic&.private_message?
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warn_if_not_sidekiq
DiscourseEvent.trigger(:before_create_notifications_for_users, users, post)
users.each do |u|
create_notification(u, Notification.types[type], post, opts)
end
users
end
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def notify_pm_users(post, reply_to_user, notified)
return unless post.topic
warn_if_not_sidekiq
# users that aren't part of any mentioned groups
users = directly_targeted_users(post).reject { |u| notified.include?(u) }
DiscourseEvent.trigger(:before_create_notifications_for_users, users, post)
users.each do |user|
notification_level = TopicUser.get(post.topic, user)&.notification_level
if reply_to_user == user || notification_level == TopicUser.notification_levels[:watching] || user.staged?
create_notification(user, Notification.types[:private_message], post)
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end
end
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# users that are part of all mentionned groups
users = indirectly_targeted_users(post).reject { |u| notified.include?(u) }
DiscourseEvent.trigger(:before_create_notifications_for_users, users, post)
users.each do |user|
case TopicUser.get(post.topic, user)&.notification_level
when TopicUser.notification_levels[:watching]
# only create a notification when watching the group
create_notification(user, Notification.types[:private_message], post)
when TopicUser.notification_levels[:tracking]
notify_group_summary(user, post)
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end
end
end
def notify_post_users(post, notified, include_category_watchers: true, include_tag_watchers: true)
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return unless post.topic
warn_if_not_sidekiq
condition = +<<~SQL
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id IN (
SELECT user_id
FROM topic_users
WHERE notification_level = :watching
AND topic_id = :topic_id
/*category*/
/*tags*/
)
SQL
if include_category_watchers
condition.sub! "/*category*/", <<~SQL
UNION
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SELECT cu.user_id
FROM category_users cu
LEFT JOIN topic_users tu ON tu.user_id = cu.user_id
AND tu.topic_id = :topic_id
WHERE cu.notification_level = :watching
AND cu.category_id = :category_id
AND tu.user_id IS NULL
SQL
end
tag_ids = post.topic.topic_tags.pluck('topic_tags.tag_id')
if include_tag_watchers && tag_ids.present?
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condition.sub! "/*tags*/", <<~SQL
UNION
SELECT tag_users.user_id
FROM tag_users
LEFT JOIN topic_users tu ON tu.user_id = tag_users.user_id
AND tu.topic_id = :topic_id
WHERE tag_users.notification_level = :watching
AND tag_users.tag_id IN (:tag_ids)
AND tu.user_id IS NULL
SQL
end
notify = User.where(condition,
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watching: TopicUser.notification_levels[:watching],
topic_id: post.topic_id,
category_id: post.topic.category_id,
tag_ids: tag_ids
)
exclude_user_ids = notified.map(&:id)
notify = notify.where("id NOT IN (?)", exclude_user_ids) if exclude_user_ids.present?
DiscourseEvent.trigger(:before_create_notifications_for_users, notify, post)
already_seen_user_ids = Set.new TopicUser.where(topic_id: post.topic.id).where("highest_seen_post_number >= ?", post.post_number).pluck(:user_id)
each_user_in_batches(notify) do |user|
notification_type = already_seen_user_ids.include?(user.id) ? Notification.types[:edited] : Notification.types[:posted]
create_notification(user, notification_type, post)
end
end
def warn_if_not_sidekiq
Rails.logger.warn("PostAlerter.#{caller_locations(1, 1)[0].label} was called outside of sidekiq") unless Sidekiq.server?
end
private
def each_user_in_batches(users)
# This is race-condition-safe, unlike #find_in_batches
users.pluck(:id).each_slice(USER_BATCH_SIZE) do |user_ids_batch|
User.where(id: user_ids_batch).each { |user| yield(user) }
end
end
end