140 lines
5.2 KiB
Ruby
140 lines
5.2 KiB
Ruby
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
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def after_save(model)
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method_name = callback_for('after_save', model)
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send(method_name, model) if respond_to?(method_name)
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end
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# Dispatch to an after_create_#{class_name} method
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def after_create(model)
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method_name = callback_for('after_create', model)
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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
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def after_save_post(post)
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return if post.topic.private_message?
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mentioned_users = extract_mentioned_users(post)
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quoted_users = extract_quoted_users(post)
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reply_to_user = post.reply_notification_target
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notify_users(mentioned_users - [reply_to_user], :mentioned, post)
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notify_users(quoted_users - mentioned_users - [reply_to_user], :quoted, post)
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end
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def after_save_post_action(post_action)
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# We only care about deleting post actions for now
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return if post_action.deleted_at.blank?
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Notification.where(post_action_id: post_action.id).each(&:destroy)
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end
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def after_create_post_action(post_action)
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# We only notify on likes for now
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return unless post_action.is_like?
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post = post_action.post
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return if post_action.user.blank?
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return if post.topic.private_message?
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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)
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post = post_revision.post
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return if post_revision.user.blank?
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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)
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if post.topic.private_message?
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# If it's a private message, notify the topic_allowed_users
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post.topic.all_allowed_users.reject{ |a| a.id == post.user_id }.each do |a|
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create_notification(a, Notification.types[:private_message], post)
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end
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elsif post.post_type != Post.types[:moderator_action]
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# 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
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protected
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def callback_for(action, model)
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"#{action}_#{model.class.name.underscore.gsub(/.+\//, '')}"
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end
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def create_notification(user, type, post, opts={})
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return if user.blank?
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# Make sure the user can see the post
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return unless Guardian.new(user).can_see?(post)
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# skip if muted on the topic
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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
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return if user.notifications.exists?(notification_type: type, topic_id: post.topic_id, post_number: post.post_number)
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# Create the notification
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user.notifications.create(notification_type: type,
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topic_id: post.topic_id,
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post_number: post.post_number,
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post_action_id: opts[:post_action_id],
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data: { topic_title: post.topic.title,
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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
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def extract_mentioned_users(post)
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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
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def extract_quoted_users(post)
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post.raw.scan(/\[quote=\"([^,]+),.+\"\]/).uniq.map do |m|
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User.where("username_lower = :username and id != :id", username: m.first.strip.downcase, id: post.user_id).first
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end.compact
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end
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# Notify a bunch of users
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def notify_users(users, type, post)
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users = [users] unless users.is_a?(Array)
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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
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# TODO: This should use javascript for parsing rather than re-doing it this way.
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def notify_post_users(post)
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# Is this post a reply to a user?
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reply_to_user = post.reply_notification_target
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notify_users(reply_to_user, :replied, post)
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# find all users watching
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if post.post_number > 1
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exclude_user_ids = []
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exclude_user_ids << post.user_id
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exclude_user_ids << reply_to_user.id if reply_to_user.present?
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exclude_user_ids << extract_mentioned_users(post).map(&:id)
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exclude_user_ids << extract_quoted_users(post).map(&:id)
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exclude_user_ids.flatten!
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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
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end
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end
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end
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