discourse/plugins/discourse-presence/plugin.rb

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# name: discourse-presence
# about: Show which users are writing a reply to a topic
# version: 1.0
# authors: André Pereira, David Taylor
2018-04-06 00:46:42 -04:00
# url: https://github.com/discourse/discourse/tree/master/plugins/discourse-presence
enabled_site_setting :presence_enabled
hide_plugin if self.respond_to?(:hide_plugin)
register_asset 'stylesheets/presence.scss'
PLUGIN_NAME ||= -"discourse-presence"
after_initialize do
module ::Presence
class Engine < ::Rails::Engine
engine_name PLUGIN_NAME
isolate_namespace Presence
end
end
module ::Presence::PresenceManager
MAX_BACKLOG_AGE ||= 60
def self.get_redis_key(type, id)
"presence:#{type}:#{id}"
end
def self.get_messagebus_channel(type, id)
"/presence/#{type}/#{id}"
end
# return true if a key was added
def self.add(type, id, user_id)
key = get_redis_key(type, id)
result = $redis.hset(key, user_id, Time.zone.now)
$redis.expire(key, MAX_BACKLOG_AGE)
result
end
# return true if a key was deleted
def self.remove(type, id, user_id)
key = get_redis_key(type, id)
$redis.expire(key, MAX_BACKLOG_AGE)
$redis.hdel(key, user_id) > 0
end
def self.get_users(type, id)
user_ids = $redis.hkeys(get_redis_key(type, id)).map(&:to_i)
User.where(id: user_ids)
end
def self.publish(type, id)
users = get_users(type, id)
serialized_users = users.map { |u| BasicUserSerializer.new(u, root: false) }
message = { users: serialized_users, time: Time.now.to_i }
messagebus_channel = get_messagebus_channel(type, id)
topic = type == 'post' ? Post.find_by(id: id).topic : Topic.find_by(id: id)
if topic.private_message?
user_ids = User.where('admin OR moderator').pluck(:id) + topic.allowed_users.pluck(:id)
group_ids = topic.allowed_groups.pluck(:id)
MessageBus.publish(
messagebus_channel,
message.as_json,
user_ids: user_ids,
group_ids: group_ids,
max_backlog_age: MAX_BACKLOG_AGE
)
else
MessageBus.publish(
messagebus_channel,
message.as_json,
group_ids: topic.secure_group_ids,
max_backlog_age: MAX_BACKLOG_AGE
)
end
users
end
def self.cleanup(type, id)
has_changed = false
# Delete entries older than 20 seconds
hash = $redis.hgetall(get_redis_key(type, id))
hash.each do |user_id, time|
if Time.zone.now - Time.parse(time) >= 20
has_changed |= remove(type, id, user_id)
end
end
has_changed
end
end
require_dependency "application_controller"
class Presence::PresencesController < ::ApplicationController
requires_plugin PLUGIN_NAME
before_action :ensure_logged_in
ACTIONS ||= [-"edit", -"reply"].freeze
def publish
raise Discourse::NotFound if current_user.blank? || current_user.user_option.hide_profile_and_presence?
data = params.permit(
:response_needed,
current: [:action, :topic_id, :post_id],
previous: [:action, :topic_id, :post_id]
)
payload = {}
if data[:previous] && data[:previous][:action].in?(ACTIONS)
type = data[:previous][:post_id] ? 'post' : 'topic'
id = data[:previous][:post_id] ? data[:previous][:post_id] : data[:previous][:topic_id]
topic = type == 'post' ? Post.find_by(id: id)&.topic : Topic.find_by(id: id)
if topic
guardian.ensure_can_see!(topic)
Presence::PresenceManager.remove(type, id, current_user.id)
Presence::PresenceManager.cleanup(type, id)
Presence::PresenceManager.publish(type, id)
end
end
if data[:current] && data[:current][:action].in?(ACTIONS)
type = data[:current][:post_id] ? 'post' : 'topic'
id = data[:current][:post_id] ? data[:current][:post_id] : data[:current][:topic_id]
topic = type == 'post' ? Post.find_by(id: id)&.topic : Topic.find_by(id: id)
if topic
guardian.ensure_can_see!(topic)
Presence::PresenceManager.add(type, id, current_user.id)
Presence::PresenceManager.cleanup(type, id)
users = Presence::PresenceManager.publish(type, id)
if data[:response_needed]
messagebus_channel = Presence::PresenceManager.get_messagebus_channel(type, id)
users ||= Presence::PresenceManager.get_users(type, id)
payload = json_payload(messagebus_channel, users)
end
end
end
render json: payload
end
def json_payload(channel, users)
{
messagebus_channel: channel,
messagebus_id: MessageBus.last_id(channel),
users: users.limit(SiteSetting.presence_max_users_shown).map { |u| BasicUserSerializer.new(u, root: false) }
}
end
end
Presence::Engine.routes.draw do
post '/publish' => 'presences#publish'
end
Discourse::Application.routes.append do
mount ::Presence::Engine, at: '/presence'
end
end