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
# url: https://github.com/discourse/discourse-presence.git
enabled_site_setting :presence_enabled
register_asset 'stylesheets/presence.scss'
PLUGIN_NAME ||= "discourse-presence".freeze
after_initialize do
module ::Presence
class Engine < ::Rails::Engine
engine_name PLUGIN_NAME
isolate_namespace Presence
end
end
module ::Presence::PresenceManager
def self.get_redis_key(type, id)
"presence:#{type}:#{id}"
end
def self.get_messagebus_channel(type, id)
"/presence/#{type}/#{id}"
end
def self.add(type, id, user_id)
redis_key = get_redis_key(type, id)
response = $redis.hset(redis_key, user_id, Time.zone.now)
response # Will be true if a new key
end
def self.remove(type, id, user_id)
redis_key = get_redis_key(type, id)
response = $redis.hdel(redis_key, user_id)
response > 0 # Return true if key was actually deleted
end
def self.get_users(type, id)
redis_key = get_redis_key(type, id)
user_ids = $redis.hkeys(redis_key).map(&:to_i)
User.where(id: user_ids)
end
def self.publish(type, id)
topic =
if type == 'post'
Post.find_by(id: id).topic
else
Topic.find_by(id: id)
end
users = get_users(type, id)
serialized_users = users.map { |u| BasicUserSerializer.new(u, root: false) }
message = {
users: serialized_users
}
messagebus_channel = get_messagebus_channel(type, id)
if topic.archetype == Archetype.private_message
user_ids = User.where('admin or moderator').pluck(:id)
user_ids += topic.allowed_users.pluck(:id)
MessageBus.publish(messagebus_channel, message.as_json, user_ids: user_ids)
else
MessageBus.publish(messagebus_channel, message.as_json, group_ids: topic.secure_group_ids)
end
users
end
def self.cleanup(type, id)
hash = $redis.hgetall(get_redis_key(type, id))
original_hash_size = hash.length
any_changes = false
# Delete entries older than 20 seconds
hash.each do |user_id, time|
if Time.zone.now - Time.parse(time) >= 20
any_changes ||= remove(type, id, user_id)
end
end
any_changes
end
end
require_dependency "application_controller"
class Presence::PresencesController < ::ApplicationController
requires_plugin PLUGIN_NAME
before_action :ensure_logged_in
def publish
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?(['edit', 'reply'])
type = data[:previous][:post_id] ? 'post' : 'topic'
id = data[:previous][:post_id] ? data[:previous][:post_id] : data[:previous][:topic_id]
topic =
if type == 'post'
Post.find_by(id: id)&.topic
else
Topic.find_by(id: id)
end
if topic
guardian.ensure_can_see!(topic)
any_changes = false
any_changes ||= Presence::PresenceManager.remove(type, id, current_user.id)
any_changes ||= Presence::PresenceManager.cleanup(type, id)
users = Presence::PresenceManager.publish(type, id) if any_changes
end
end
if data[:current] && data[:current][:action].in?(['edit', 'reply'])
type = data[:current][:post_id] ? 'post' : 'topic'
id = data[:current][:post_id] ? data[:current][:post_id] : data[:current][:topic_id]
topic =
if type == 'post'
Post.find_by(id: id)&.topic
else
Topic.find_by(id: id)
end
if topic
guardian.ensure_can_see!(topic)
any_changes = false
any_changes ||= Presence::PresenceManager.add(type, id, current_user.id)
any_changes ||= Presence::PresenceManager.cleanup(type, id)
users = Presence::PresenceManager.publish(type, id) if any_changes
if data[:response_needed]
users ||= Presence::PresenceManager.get_users(type, id)
serialized_users = users.map { |u| BasicUserSerializer.new(u, root: false) }
messagebus_channel = Presence::PresenceManager.get_messagebus_channel(type, id)
{
messagebus_channel: messagebus_channel,
messagebus_id: MessageBus.last_id(messagebus_channel),
users: serialized_users
}
end
else
{}
end
end
render json: payload
end
end
Presence::Engine.routes.draw do
post '/publish' => 'presences#publish'
end
Discourse::Application.routes.append do
mount ::Presence::Engine, at: '/presence'
end
end