discourse/app/services/post_alerter.rb

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class PostAlerter
def self.post_created(post)
alerter = PostAlerter.new
alerter.after_save_post(post, true)
post
end
def not_allowed?(user, post)
user.blank? ||
user.id == Discourse::SYSTEM_USER_ID ||
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 after_save_post(post, new_record = false)
notified = [post.user]
# mentions (users/groups)
mentioned_groups, mentioned_users = extract_mentions(post)
if mentioned_groups || mentioned_users
mentioned_opts = {}
if post.last_editor_id != post.user_id
# Mention comes from an edit by someone else, so notification should say who added the mention.
editor = post.last_editor
mentioned_opts = {user_id: editor.id, original_username: editor.username, display_username: editor.username}
end
expand_group_mentions(mentioned_groups, post) do |group, users|
notify_non_pm_users(users - notified, :group_mentioned, post, mentioned_opts.merge({group: group}))
notified += users
end
if mentioned_users
notify_non_pm_users(mentioned_users - notified, :mentioned, post, mentioned_opts)
notified += mentioned_users
end
end
# replies
reply_to_user = post.reply_notification_target
if new_record && reply_to_user && !notified.include?(reply_to_user) && post.post_type == Post.types[:regular]
notify_non_pm_users(reply_to_user, :replied, post)
notified += [reply_to_user]
end
# quotes
quoted_users = extract_quoted_users(post)
notify_non_pm_users(quoted_users - notified, :quoted, post)
notified += quoted_users
# linked
linked_users = extract_linked_users(post)
notify_non_pm_users(linked_users - notified, :linked, post)
notified += linked_users
# private messages
if new_record
if post.topic.private_message?
# users that aren't part of any mentioned groups
directly_targeted_users(post).each do |user|
notification_level = TopicUser.get(post.topic, user).try(:notification_level)
if notified.include?(user) || notification_level == TopicUser.notification_levels[:watching]
create_notification(user, Notification.types[:private_message], post)
end
end
# users that are part of all mentionned groups
indirectly_targeted_users(post).each do |user|
# only create a notification when watching the group
notification_level = TopicUser.get(post.topic, user).try(:notification_level)
if notification_level == TopicUser.notification_levels[:watching]
create_notification(user, Notification.types[:private_message], post)
elsif notification_level == TopicUser.notification_levels[:tracking]
if notified.include?(user)
create_notification(user, Notification.types[:private_message], post)
else
notify_group_summary(user, post)
end
end
end
elsif post.post_type == Post.types[:regular]
# If it's not a private message and it's not an automatic post caused by a moderator action, notify the users
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?
cat_watchers = topic.category_users
.where(notification_level: CategoryUser.notification_levels[:watching_first_post])
.pluck(:user_id)
tag_watchers = topic.tag_users
.where(notification_level: TagUser.notification_levels[:watching_first_post])
.pluck(:user_id)
group_ids = topic.allowed_groups.pluck(:group_id)
group_watchers = GroupUser.where(group_id: group_ids,
notification_level: GroupUser.notification_levels[:watching_first_post])
.pluck(:user_id)
watchers = [cat_watchers, tag_watchers, group_watchers].flatten
notify_first_post_watchers(post, watchers)
end
end
end
def notify_first_post_watchers(post, user_ids)
return if user_ids.blank?
user_ids.uniq!
# Don't notify the OP
user_ids -= [post.user_id]
User.where(id: user_ids).each do |u|
create_notification(u, 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))
.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)
.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])
.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, type, topic)
return if user.blank?
return unless Guardian.new(user).can_see?(topic)
user.notifications.where(notification_type: type,
topic_id: topic.id).destroy_all
# HACK so notification counts sync up correctly
user.reload
end
NOTIFIABLE_TYPES = [:mentioned, :replied, :quoted, :posted, :linked, :private_message, :group_mentioned].map{ |t|
Notification.types[t]
}
def group_stats(topic)
topic.allowed_groups.map do |g|
{
group_id: g.id,
group_name: g.name.downcase,
inbox_count: Topic.exec_sql(
"SELECT COUNT(*) FROM topics t
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JOIN topic_allowed_groups g ON g.group_id = :group_id AND g.topic_id = t.id
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LEFT JOIN group_archived_messages a ON a.topic_id = t.id AND a.group_id = g.group_id
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WHERE a.id IS NULL AND t.deleted_at is NULL AND t.archetype = 'private_message'",
group_id: g.id).values[0][0].to_i
}
end
end
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
.topic_allowed_groups
.where(group_id: user.groups.pluck(:id))
.pluck(:group_id).first
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]
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
)
# TODO decide if it makes sense to also publish a desktop notification
end
def should_notify_edit?(notification, opts)
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return notification.data_hash["display_username"] != opts[:display_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
return false
end
def should_notify_previous?(user, notification, opts)
case notification.notification_type
when Notification.types[:edited] then should_notify_edit?(notification, opts)
when Notification.types[:liked] then should_notify_like?(user, notification)
else false
end
end
COLLAPSED_NOTIFICATION_TYPES ||= [
Notification.types[:replied],
Notification.types[:quoted],
Notification.types[:posted],
]
def create_notification(user, type, post, opts=nil)
return if user.blank?
return if user.id == Discourse::SYSTEM_USER_ID
return if type == Notification.types[:liked] && user.user_option.like_notification_frequency == UserOption.like_notification_frequency_type[:never]
opts ||= {}
# Make sure the user can see the post
return unless Guardian.new(user).can_see?(post)
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?
# skip if muted on the topic
return if TopicUser.get(post.topic, user).try(:notification_level) == TopicUser.notification_levels[:muted]
# skip if muted on the group
if group = opts[:group]
return if GroupUser.find_by(group_id: opts[:group_id], user_id: user.id).try(:notification_level) == TopicUser.notification_levels[:muted]
end
# Don't notify the same user about the same notification on the same post
existing_notification = user.notifications
.order("notifications.id DESC")
.find_by(topic_id: post.topic_id,
post_number: post.post_number,
notification_type: type)
return if existing_notification && !should_notify_previous?(user, existing_notification, opts)
notification_data = {}
if existing_notification &&
existing_notification.created_at > 1.day.ago &&
user.user_option.like_notification_frequency == UserOption.like_notification_frequency_type[:always]
data = existing_notification.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.id).destroy_all
end
collapsed = false
if COLLAPSED_NOTIFICATION_TYPES.include?(type)
COLLAPSED_NOTIFICATION_TYPES.each do |t|
destroy_notifications(user, t, post.topic)
end
collapsed = true
end
if type == Notification.types[:private_message]
destroy_notifications(user, type, post.topic)
collapsed = true
end
original_post = post
original_username = opts[:display_username] || post.username # xxxxx need something here too
if collapsed
post = first_unread_post(user, post.topic) || post
count = unread_count(user, post.topic)
if count > 1
I18n.with_locale(user.effective_locale) do
opts[:display_username] = I18n.t('embed.replies', count: count)
end
end
end
UserActionObserver.log_notification(original_post, user, type, opts[:acting_user_id])
topic_title = post.topic.title
# when sending a private message email, keep the original title
if post.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
notification_data.merge!({
topic_title: topic_title,
original_post_id: original_post.id,
original_post_type: original_post.post_type,
original_username: original_username,
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
# Create the notification
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)
if !existing_notification && NOTIFIABLE_TYPES.include?(type)
# we may have an invalid post somehow, dont blow up
post_url = original_post.url rescue nil
if post_url
payload = {
notification_type: type,
post_number: original_post.post_number,
topic_title: original_post.topic.title,
topic_id: original_post.topic.id,
excerpt: original_post.excerpt(400, text_entities: true, strip_links: true, remap_emoji: true),
username: original_username,
post_url: post_url
}
MessageBus.publish("/notification-alert/#{user.id}", payload, user_ids: [user.id])
push_notification(user, payload)
DiscourseEvent.trigger(:post_notification_alert, user, payload)
end
end
end
def push_notification(user, payload)
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)) AND push_url IS NOT NULL AND position(push_url in ?) > 0 AND revoked_at IS NULL",
SiteSetting.allowed_user_api_push_urls)
.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).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 unless mentions && mentions.length > 0
groups = Group.where('LOWER(name) IN (?)', mentions)
mentions -= groups.map(&:name).map(&:downcase)
return [groups, nil] unless mentions && mentions.length > 0
users = User.where(username_lower: mentions).where.not(id: post.user_id)
[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(post_number: 1).first
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=nil)
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return if post.topic.try(:private_message?)
users = [users] unless users.is_a?(Array)
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users.each do |u|
create_notification(u, Notification.types[type], post, opts)
end
end
def notify_post_users(post, notified)
return unless post.topic
condition = <<SQL
id IN (
SELECT user_id FROM topic_users
WHERE notification_level = :watching AND topic_id = :topic_id
UNION ALL
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
/*tags*/
)
SQL
tag_ids = post.topic.topic_tags.pluck('topic_tags.tag_id')
if tag_ids.present?
condition.sub! "/*tags*/", <<SQL
UNION ALL
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,
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?
notify.each do |user|
create_notification(user, Notification.types[:posted], post)
end
end
end