discourse/plugins/poll/plugin.rb

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# name: poll
# about: Official poll plugin for Discourse
# version: 0.9
# authors: Vikhyat Korrapati (vikhyat), Régis Hanol (zogstrip)
# url: https://github.com/discourse/discourse/tree/master/plugins/poll
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register_asset "stylesheets/common/poll.scss"
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register_asset "stylesheets/common/poll-ui-builder.scss"
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register_asset "stylesheets/desktop/poll.scss", :desktop
register_asset "stylesheets/mobile/poll.scss", :mobile
PLUGIN_NAME ||= "discourse_poll".freeze
DATA_PREFIX ||= "data-poll-".freeze
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after_initialize do
module ::DiscoursePoll
DEFAULT_POLL_NAME ||= "poll".freeze
POLLS_CUSTOM_FIELD ||= "polls".freeze
VOTES_CUSTOM_FIELD ||= "polls-votes".freeze
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MUTEX_PREFIX ||= PLUGIN_NAME
autoload :PostValidator, "#{Rails.root}/plugins/poll/lib/post_validator"
autoload :PollsValidator, "#{Rails.root}/plugins/poll/lib/polls_validator"
autoload :PollsUpdater, "#{Rails.root}/plugins/poll/lib/polls_updater"
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autoload :VotesUpdater, "#{Rails.root}/plugins/poll/lib/votes_updater"
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class Engine < ::Rails::Engine
engine_name PLUGIN_NAME
isolate_namespace DiscoursePoll
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end
end
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class DiscoursePoll::Poll
class << self
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def vote(post_id, poll_name, options, user)
DistributedMutex.synchronize("#{PLUGIN_NAME}-#{post_id}") do
user_id = user.id
post = Post.find_by(id: post_id)
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# post must not be deleted
if post.nil? || post.trashed?
raise StandardError.new I18n.t("poll.post_is_deleted")
end
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# topic must not be archived
if post.topic.try(:archived)
raise StandardError.new I18n.t("poll.topic_must_be_open_to_vote")
end
# user must be allowed to post in topic
unless Guardian.new(user).can_create_post?(post.topic)
raise StandardError.new I18n.t("poll.user_cant_post_in_topic")
end
polls = post.custom_fields[DiscoursePoll::POLLS_CUSTOM_FIELD]
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raise StandardError.new I18n.t("poll.no_polls_associated_with_this_post") if polls.blank?
poll = polls[poll_name]
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raise StandardError.new I18n.t("poll.no_poll_with_this_name", name: poll_name) if poll.blank?
raise StandardError.new I18n.t("poll.poll_must_be_open_to_vote") if poll["status"] != "open"
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public_poll = (poll["public"] == "true")
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# remove options that aren't available in the poll
available_options = poll["options"].map { |o| o["id"] }.to_set
options.select! { |o| available_options.include?(o) }
raise StandardError.new I18n.t("poll.requires_at_least_1_valid_option") if options.empty?
poll["voters"] = poll["anonymous_voters"] || 0
all_options = Hash.new(0)
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post.custom_fields[DiscoursePoll::VOTES_CUSTOM_FIELD] ||= {}
post.custom_fields[DiscoursePoll::VOTES_CUSTOM_FIELD]["#{user_id}"] ||= {}
post.custom_fields[DiscoursePoll::VOTES_CUSTOM_FIELD]["#{user_id}"][poll_name] = options
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post.custom_fields[DiscoursePoll::VOTES_CUSTOM_FIELD].each do |_, user_votes|
next unless votes = user_votes[poll_name]
votes.each { |option| all_options[option] += 1 }
poll["voters"] += 1 if (available_options & votes.to_set).size > 0
end
poll["options"].each do |option|
anonymous_votes = option["anonymous_votes"] || 0
option["votes"] = all_options[option["id"]] + anonymous_votes
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if public_poll
option["voter_ids"] ||= []
if options.include?(option["id"])
option["voter_ids"] << user_id if !option["voter_ids"].include?(user_id)
else
option["voter_ids"].delete(user_id)
end
end
end
post.custom_fields[DiscoursePoll::POLLS_CUSTOM_FIELD] = polls
post.save_custom_fields(true)
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payload = { post_id: post_id, polls: polls }
if public_poll
payload.merge!(user: UserNameSerializer.new(user).serializable_hash)
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end
MessageBus.publish("/polls/#{post.topic_id}", payload)
return [poll, options]
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end
end
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def toggle_status(post_id, poll_name, status, user_id)
DistributedMutex.synchronize("#{PLUGIN_NAME}-#{post_id}") do
post = Post.find_by(id: post_id)
# post must not be deleted
if post.nil? || post.trashed?
raise StandardError.new I18n.t("poll.post_is_deleted")
end
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# topic must not be archived
if post.topic.try(:archived)
raise StandardError.new I18n.t("poll.topic_must_be_open_to_toggle_status")
end
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user = User.find_by(id: user_id)
# either staff member or OP
unless user_id == post.user_id || user.try(:staff?)
raise StandardError.new I18n.t("poll.only_staff_or_op_can_toggle_status")
end
polls = post.custom_fields[DiscoursePoll::POLLS_CUSTOM_FIELD]
raise StandardError.new I18n.t("poll.no_polls_associated_with_this_post") if polls.blank?
raise StandardError.new I18n.t("poll.no_poll_with_this_name", name: poll_name) if polls[poll_name].blank?
polls[poll_name]["status"] = status
post.save_custom_fields(true)
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MessageBus.publish("/polls/#{post.topic_id}", post_id: post.id, polls: polls)
polls[poll_name]
end
end
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def extract(raw, topic_id, user_id = nil)
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# TODO: we should fix the callback mess so that the cooked version is available
# in the validators instead of cooking twice
cooked = PrettyText.cook(raw, topic_id: topic_id, user_id: user_id)
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parsed = Nokogiri::HTML(cooked)
extracted_polls = []
# extract polls
parsed.css("div.poll").each do |p|
poll = { "options" => [], "voters" => 0 }
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# extract attributes
p.attributes.values.each do |attribute|
if attribute.name.start_with?(DATA_PREFIX)
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poll[attribute.name[DATA_PREFIX.length..-1]] = CGI.escapeHTML(attribute.value || "")
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end
end
# extract options
p.css("li[#{DATA_PREFIX}option-id]").each do |o|
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option_id = o.attributes[DATA_PREFIX + "option-id"].value || ""
poll["options"] << { "id" => option_id, "html" => o.inner_html, "votes" => 0 }
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end
# add the poll
extracted_polls << poll
end
extracted_polls
end
end
end
require_dependency "application_controller"
class DiscoursePoll::PollsController < ::ApplicationController
requires_plugin PLUGIN_NAME
before_action :ensure_logged_in, except: [:voters]
def vote
post_id = params.require(:post_id)
poll_name = params.require(:poll_name)
options = params.require(:options)
begin
poll, options = DiscoursePoll::Poll.vote(post_id, poll_name, options, current_user)
render json: { poll: poll, vote: options }
rescue StandardError => e
render_json_error e.message
end
end
def toggle_status
post_id = params.require(:post_id)
poll_name = params.require(:poll_name)
status = params.require(:status)
user_id = current_user.id
begin
poll = DiscoursePoll::Poll.toggle_status(post_id, poll_name, status, user_id)
render json: { poll: poll }
rescue StandardError => e
render_json_error e.message
end
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end
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def voters
post_id = params.require(:post_id)
poll_name = params.require(:poll_name)
post = Post.find_by(id: post_id)
raise Discourse::InvalidParameters.new("post_id is invalid") if !post
poll = post.custom_fields[DiscoursePoll::POLLS_CUSTOM_FIELD][poll_name]
raise Discourse::InvalidParameters.new("poll_name is invalid") if !poll
voter_limit = (params[:voter_limit] || 25).to_i
voter_limit = 0 if voter_limit < 0
voter_limit = 50 if voter_limit > 50
user_ids = []
options = poll["options"]
if poll["type"] != "number"
per_option_voters = {}
options.each do |option|
if (params[:option_id])
next unless option["id"] == params[:option_id].to_s
end
next unless option["voter_ids"]
voters = option["voter_ids"].slice((params[:offset].to_i || 0) * voter_limit, voter_limit)
per_option_voters[option["id"]] = Set.new(voters)
user_ids << voters
end
user_ids.flatten!
user_ids.uniq!
poll_votes = post.custom_fields[DiscoursePoll::VOTES_CUSTOM_FIELD]
result = {}
User.where(id: user_ids).map do |user|
user_hash = UserNameSerializer.new(user).serializable_hash
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poll_votes[user.id.to_s][poll_name].each do |option_id|
if (params[:option_id])
next unless option_id == params[:option_id].to_s
end
voters = per_option_voters[option_id]
# we may have a user from a different vote
next unless voters.include?(user.id)
result[option_id] ||= []
result[option_id] << user_hash
end
end
else
user_ids = options.map { |option| option["voter_ids"] }.sort!
user_ids.flatten!
user_ids.uniq!
user_ids = user_ids.slice((params[:offset].to_i || 0) * voter_limit, voter_limit)
result = []
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User.where(id: user_ids).map do |user|
result << UserNameSerializer.new(user).serializable_hash
end
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end
render json: { poll_name => result }
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end
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end
DiscoursePoll::Engine.routes.draw do
put "/vote" => "polls#vote"
put "/toggle_status" => "polls#toggle_status"
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get "/voters" => 'polls#voters'
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end
Discourse::Application.routes.append do
mount ::DiscoursePoll::Engine, at: "/polls"
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end
Post.class_eval do
attr_accessor :polls
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after_save do
next if self.polls.blank? || !self.polls.is_a?(Hash)
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post = self
polls = self.polls
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DistributedMutex.synchronize("#{PLUGIN_NAME}-#{post.id}") do
post.custom_fields[DiscoursePoll::POLLS_CUSTOM_FIELD] = polls
post.save_custom_fields(true)
end
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end
end
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validate(:post, :validate_polls) do |force = nil|
# only care when raw has changed!
return unless self.raw_changed? || force
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validator = DiscoursePoll::PollsValidator.new(self)
return unless (polls = validator.validate_polls)
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if !polls.empty?
validator = DiscoursePoll::PostValidator.new(self)
return unless validator.validate_post
end
# are we updating a post?
if self.id.present?
DistributedMutex.synchronize("#{PLUGIN_NAME}-#{self.id}") do
DiscoursePoll::PollsUpdater.update(self, polls)
end
else
self.polls = polls
end
true
end
NewPostManager.add_handler(1) do |manager|
post = Post.new(raw: manager.args[:raw])
if !DiscoursePoll::PollsValidator.new(post).validate_polls
result = NewPostResult.new(:poll, false)
post.errors.full_messages.each do |message|
result.errors[:base] << message
end
result
else
manager.args["is_poll"] = true
nil
end
end
on(:approved_post) do |queued_post, created_post|
if queued_post.post_options["is_poll"]
created_post.validate_polls(true)
end
end
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register_post_custom_field_type(DiscoursePoll::POLLS_CUSTOM_FIELD, :json)
register_post_custom_field_type(DiscoursePoll::VOTES_CUSTOM_FIELD, :json)
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topic_view_post_custom_fields_whitelister do |user|
user ? [DiscoursePoll::POLLS_CUSTOM_FIELD, DiscoursePoll::VOTES_CUSTOM_FIELD] : [DiscoursePoll::POLLS_CUSTOM_FIELD]
end
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on(:reduce_cooked) do |fragment, post|
if post.nil? || post.trashed?
fragment.css(".poll, [data-poll-name]").each(&:remove)
else
post_url = "#{Discourse.base_url}#{post.url}"
fragment.css(".poll, [data-poll-name]").each do |poll|
poll.replace "<p><a href='#{post_url}'>#{I18n.t("poll.email.link_to_poll")}</a></p>"
end
end
end
# tells the front-end we have a poll for that post
on(:post_created) do |post|
next if post.is_first_post? || post.custom_fields[DiscoursePoll::POLLS_CUSTOM_FIELD].blank?
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MessageBus.publish("/polls/#{post.topic_id}", post_id: post.id,
polls: post.custom_fields[DiscoursePoll::POLLS_CUSTOM_FIELD])
end
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on(:merging_users) do |source_user, target_user|
DiscoursePoll::VotesUpdater.merge_users!(source_user, target_user)
end
add_to_serializer(:post, :polls, false) do
polls = post_custom_fields[DiscoursePoll::POLLS_CUSTOM_FIELD].dup
polls.each do |_, poll|
poll["options"].each do |option|
option.delete("voter_ids")
end
end
end
add_to_serializer(:post, :include_polls?) { post_custom_fields.present? && post_custom_fields[DiscoursePoll::POLLS_CUSTOM_FIELD].present? }
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add_to_serializer(:post, :polls_votes, false) do
post_custom_fields[DiscoursePoll::VOTES_CUSTOM_FIELD]["#{scope.user.id}"]
end
add_to_serializer(:post, :include_polls_votes?) do
return unless scope.user
return unless post_custom_fields.present?
return unless post_custom_fields[DiscoursePoll::VOTES_CUSTOM_FIELD].present?
post_custom_fields[DiscoursePoll::VOTES_CUSTOM_FIELD].has_key?("#{scope.user.id}")
end
end