class PostAlertObserver < ActiveRecord::Observer observe :post, VestalVersions::Version, :post_action # 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) end # We need to consider new people to mention / quote when a post is edited def after_save_post(post) 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) 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 return if post_action.user.blank? return if post.topic.private_message? create_notification(post.user, Notification.types[:liked], post, display_username: post_action.user.username, post_action_id: post_action.id) end def after_create_version(version) post = version.versioned return unless post.is_a?(Post) return if version.user.blank? return if version.user_id == post.user_id return if post.topic.private_message? create_notification(post.user, Notification.types[:edited], post, display_username: version.user.username) end def after_create_post(post) if post.topic.private_message? # If it's a private message, notify the topic_allowed_users post.topic.topic_allowed_users.reject{ |a| a.user_id == post.user_id }.each do |a| create_notification(a.user, Notification.types[:private_message], post) end else # If it's not a private message, notify the users notify_post_users(post) end end protected def callback_for(action, model) "#{action}_#{model.class.name.underscore.gsub(/.+\//, '')}" end 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) # skip if muted on the topic return if TopicUser.get(post.topic, user).try(:notification_level) == TopicUser.notification_levels[:muted] # 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) # 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: { topic_title: post.topic.title, display_username: opts[:display_username] || post.user.username }.to_json) end # 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) end # Returns a list of users who were quoted in the post def extract_quoted_users(post) result = [] post.raw.scan(/\[quote=\"([^,]+),.+\"\]/).uniq.each do |m| username = m.first.strip.downcase user = User.where("username_lower = :username and id != :id", username: username, id: post.user_id).first result << user if user.present? end result end # Notify a bunch of users def notify_users(users, type, post) users = [users] unless users.is_a?(Array) users.each do |u| create_notification(u, Notification.types[type], post) end 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) # find all users watching if post.post_number > 1 exclude_user_ids = [] exclude_user_ids << post.user_id exclude_user_ids << reply_to_user.id if reply_to_user.present? exclude_user_ids << extract_mentioned_users(post).map(&:id) exclude_user_ids << extract_quoted_users(post).map(&:id) exclude_user_ids.flatten! TopicUser.where(topic_id: post.topic_id, notification_level: TopicUser.notification_levels[:watching]).includes(:user).each do |tu| create_notification(tu.user, Notification.types[:posted], post) unless exclude_user_ids.include?(tu.user_id) end end end end