discourse/app/services/group_message.rb

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# GroupMessage sends a private message to a group.
# It will also avoid sending the same message repeatedly, which can happen with
# notifications to moderators when spam is detected.
#
# Options:
#
# user: (User) If the message is about a user, pass the user object.
# limit_once_per: (seconds) Limit sending the given type of message once every X seconds.
# The default is 24 hours. Set to false to always send the message.
require_dependency 'post_creator'
require_dependency 'topic_subtype'
require_dependency 'discourse'
class GroupMessage
include Rails.application.routes.url_helpers
def self.create(group_name, message_type, opts={})
GroupMessage.new(group_name, message_type, opts).create
end
def initialize(group_name, message_type, opts={})
@group_name = group_name
@message_type = message_type
@opts = opts
end
def create
unless sent_recently?
post = PostCreator.create( Discourse.system_user,
target_group_names: [@group_name],
archetype: Archetype.private_message,
subtype: TopicSubtype.system_message,
title: I18n.t("system_messages.#{@message_type}.subject_template", message_params),
raw: I18n.t("system_messages.#{@message_type}.text_body_template", message_params) )
remember_message_sent
post
else
false
end
end
def message_params
@message_params ||= {
username: @opts[:user].username,
user_url: admin_user_path(@opts[:user].username)
}
end
def sent_recently?
return false if @opts[:limit_once_per] == false
$redis.get(sent_recently_key).present?
end
# default is to send no more than once every 24 hours (24 * 60 * 60 = 86,400 seconds)
def remember_message_sent
$redis.setex(sent_recently_key, @opts[:limit_once_per].try(:to_i) || 86_400, 1) unless @opts[:limit_once_per] == false
end
private
def sent_recently_key
"grpmsg:#{@group_name}:#{@message_type}:#{@opts[:user] ? @opts[:user].username : ''}"
end
end