discourse/app/models/post_alert_observer.rb

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class PostAlertObserver < ActiveRecord::Observer
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observe :post, :post_action, :post_revision
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# Dispatch to an after_save_#{class_name} method
def after_save(model)
method_name = callback_for('after_save', model)
send(method_name, model) if respond_to?(method_name)
end
# Dispatch to an after_create_#{class_name} method
def after_create(model)
method_name = callback_for('after_create', model)
send(method_name, model) if respond_to?(method_name)
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end
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# We need to consider new people to mention / quote when a post is edited
def after_save_post(post)
return if post.topic.private_message?
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mentioned_users = extract_mentioned_users(post)
quoted_users = extract_quoted_users(post)
reply_to_user = post.reply_notification_target
notify_users(mentioned_users - [reply_to_user], :mentioned, post)
notify_users(quoted_users - mentioned_users - [reply_to_user], :quoted, post)
end
def after_save_post_action(post_action)
# We only care about deleting post actions for now
return if post_action.deleted_at.blank?
Notification.where(post_action_id: post_action.id).each(&:destroy)
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end
def after_create_post_action(post_action)
# We only notify on likes for now
return unless post_action.is_like?
post = post_action.post
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return if post_action.user.blank?
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create_notification(post.user,
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Notification.types[:liked],
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post,
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display_username: post_action.user.username,
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post_action_id: post_action.id)
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end
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def after_create_post_revision(post_revision)
post = post_revision.post
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return unless post
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return if post_revision.user.blank?
return if post_revision.user_id == post.user_id
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return if post.topic.private_message?
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create_notification(post.user, Notification.types[:edited], post, display_username: post_revision.user.username)
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end
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def after_create_post(post)
if post.topic.private_message?
# If it's a private message, notify the topic_allowed_users
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post.topic.all_allowed_users.reject{ |user| user.id == post.user_id }.each do |user|
next if user.blank?
if TopicUser.get(post.topic, user).try(:notification_level) == TopicUser.notification_levels[:tracking]
next unless post.reply_to_post_number
next unless post.reply_to_post.user_id == user.id
end
create_notification(user, Notification.types[:private_message], post)
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end
elsif post.post_type != Post.types[:moderator_action]
# If it's not a private message and it's not an automatic post caused by a moderator action, notify the users
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notify_post_users(post)
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end
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end
protected
def callback_for(action, model)
"#{action}_#{model.class.name.underscore.gsub(/.+\//, '')}"
end
def unread_posts(user, topic)
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Post.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])
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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
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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
end
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def create_notification(user, type, post, opts={})
return if user.blank?
# Make sure the user can see the post
return unless Guardian.new(user).can_see?(post)
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# skip if muted on the topic
return if TopicUser.get(post.topic, user).try(:notification_level) == TopicUser.notification_levels[:muted]
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# Don't notify the same user about the same notification on the same post
return if user.notifications.exists?(notification_type: type, topic_id: post.topic_id, post_number: post.post_number)
collapsed = false
if type == Notification.types[:replied] ||
type == Notification.types[:posted]
destroy_notifications(user, Notification.types[:replied] , post.topic)
destroy_notifications(user, Notification.types[:posted] , post.topic)
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
if collapsed
post = first_unread_post(user,post.topic) || post
count = unread_count(user, post.topic)
opts[:display_username] = I18n.t('embed.replies', count: count) if count > 1
end
UserActionObserver.log_notification(original_post, user, type)
# Create the notification
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user.notifications.create(notification_type: type,
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topic_id: post.topic_id,
post_number: post.post_number,
post_action_id: opts[:post_action_id],
data: { topic_title: post.topic.title,
original_post_id: original_post.id,
original_username: original_username,
display_username: opts[:display_username] || post.user.username }.to_json)
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end
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# TODO: Move to post-analyzer?
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# Returns a list users who have been mentioned
def extract_mentioned_users(post)
User.where(username_lower: post.raw_mentions).where("id <> ?", post.user_id)
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end
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# TODO: Move to post-analyzer?
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# Returns a list of users who were quoted in the post
def extract_quoted_users(post)
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post.raw.scan(/\[quote=\"([^,]+),.+\"\]/).uniq.map do |m|
User.where("username_lower = :username and id != :id", username: m.first.strip.downcase, id: post.user_id).first
end.compact
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end
# Notify a bunch of users
def notify_users(users, type, post)
users = [users] unless users.is_a?(Array)
users.each do |u|
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create_notification(u, Notification.types[type], post)
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end
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end
# TODO: This should use javascript for parsing rather than re-doing it this way.
def notify_post_users(post)
# Is this post a reply to a user?
reply_to_user = post.reply_notification_target
notify_users(reply_to_user, :replied, post)
exclude_user_ids = [] <<
post.user_id <<
extract_mentioned_users(post).map(&:id) <<
extract_quoted_users(post).map(&:id)
exclude_user_ids << reply_to_user.id if reply_to_user.present?
exclude_user_ids.flatten!
TopicUser
.where(topic_id: post.topic_id, notification_level: TopicUser.notification_levels[:watching])
.includes(:user).each do |tu|
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create_notification(tu.user, Notification.types[:posted], post) unless exclude_user_ids.include?(tu.user_id)
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end
end
end