discourse/app/models/post_alert_observer.rb

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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)
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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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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
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?
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create_notification(post.user, Notification.types[:edited], post, display_username: version.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
post.topic.all_allowed_users.reject{ |a| a.id == post.user_id }.each do |a|
create_notification(a, 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 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)
# 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,
display_username: opts[:display_username] || post.user.username }.to_json)
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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)
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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
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result << user if user.present?
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end
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result
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)
# 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)
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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
end