718 lines
21 KiB
Ruby
718 lines
21 KiB
Ruby
# frozen_string_literal: true
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require 'current_user'
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require_dependency 'canonical_url'
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require_dependency 'discourse'
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require_dependency 'custom_renderer'
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require_dependency 'archetype'
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require_dependency 'rate_limiter'
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require_dependency 'crawler_detection'
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require_dependency 'json_error'
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require_dependency 'letter_avatar'
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require_dependency 'distributed_cache'
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require_dependency 'global_path'
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require_dependency 'secure_session'
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require_dependency 'topic_query'
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require_dependency 'hijack'
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class ApplicationController < ActionController::Base
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include CurrentUser
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include CanonicalURL::ControllerExtensions
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include JsonError
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include GlobalPath
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include Hijack
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attr_reader :theme_id
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serialization_scope :guardian
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protect_from_forgery
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# Default Rails 3.2 lets the request through with a blank session
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# we are being more pedantic here and nulling session / current_user
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# and then raising a CSRF exception
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def handle_unverified_request
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# NOTE: API key is secret, having it invalidates the need for a CSRF token
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unless is_api? || is_user_api?
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super
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clear_current_user
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render plain: "[\"BAD CSRF\"]", status: 403
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end
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end
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before_action :check_readonly_mode
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before_action :handle_theme
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before_action :set_current_user_for_logs
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before_action :clear_notifications
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before_action :set_locale
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before_action :set_mobile_view
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before_action :block_if_readonly_mode
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before_action :authorize_mini_profiler
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before_action :redirect_to_login_if_required
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before_action :block_if_requires_login
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before_action :preload_json
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before_action :check_xhr
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after_action :add_readonly_header
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after_action :perform_refresh_session
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after_action :dont_cache_page
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layout :set_layout
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if Rails.env == "development"
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after_action :remember_theme_id
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def remember_theme_id
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if @theme_id
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Stylesheet::Watcher.theme_id = @theme_id if defined? Stylesheet::Watcher
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end
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end
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end
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def has_escaped_fragment?
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SiteSetting.enable_escaped_fragments? && params.key?("_escaped_fragment_")
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end
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def use_crawler_layout?
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@use_crawler_layout ||=
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request.user_agent &&
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(request.content_type.blank? || request.content_type.include?('html')) &&
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!['json', 'rss'].include?(params[:format]) &&
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(has_escaped_fragment? || CrawlerDetection.crawler?(request.user_agent) || params.key?("print"))
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end
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def add_readonly_header
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response.headers['Discourse-Readonly'] = 'true' if @readonly_mode
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end
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def perform_refresh_session
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refresh_session(current_user) unless @readonly_mode
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end
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def immutable_for(duration)
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response.cache_control[:max_age] = duration.to_i
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response.cache_control[:public] = true
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response.cache_control[:extras] = ["immutable"]
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end
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def dont_cache_page
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if !response.headers["Cache-Control"] && response.cache_control.blank?
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response.cache_control[:no_cache] = true
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response.cache_control[:extras] = ["no-store"]
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end
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end
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def slow_platform?
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request.user_agent =~ /Android/
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end
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def set_layout
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use_crawler_layout? ? 'crawler' : 'application'
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end
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# Some exceptions
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class RenderEmpty < StandardError; end
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# Render nothing
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rescue_from RenderEmpty do
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render 'default/empty'
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end
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def render_rate_limit_error(e)
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retry_time_in_seconds = e&.available_in
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render_json_error(
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e.description,
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type: :rate_limit,
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status: 429,
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extras: { wait_seconds: retry_time_in_seconds },
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headers: { 'Retry-After': retry_time_in_seconds },
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)
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end
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# If they hit the rate limiter
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rescue_from RateLimiter::LimitExceeded do |e|
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render_rate_limit_error(e)
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end
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rescue_from PG::ReadOnlySqlTransaction do |e|
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Discourse.received_readonly!
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Rails.logger.error("#{e.class} #{e.message}: #{e.backtrace.join("\n")}")
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raise Discourse::ReadOnly
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end
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rescue_from Discourse::NotLoggedIn do |e|
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if (request.format && request.format.json?) || request.xhr? || !request.get?
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rescue_discourse_actions(:not_logged_in, 403, include_ember: true)
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else
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rescue_discourse_actions(:not_found, 404)
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end
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end
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rescue_from Discourse::InvalidParameters do |e|
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message = I18n.t('invalid_params', message: e.message)
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if (request.format && request.format.json?) || request.xhr? || !request.get?
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rescue_discourse_actions(:invalid_parameters, 400, include_ember: true, custom_message_translated: message)
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else
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rescue_discourse_actions(:not_found, 400, custom_message_translated: message)
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end
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end
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rescue_from ActiveRecord::StatementInvalid do |e|
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Discourse.reset_active_record_cache_if_needed(e)
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raise e
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end
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class PluginDisabled < StandardError; end
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# Handles requests for giant IDs that throw pg exceptions
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rescue_from ActiveModel::RangeError do |e|
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if e.message =~ /ActiveModel::Type::Integer/
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rescue_discourse_actions(:not_found, 404)
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else
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raise e
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end
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end
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rescue_from Discourse::NotFound, PluginDisabled, ActionController::RoutingError do
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rescue_discourse_actions(:not_found, 404)
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end
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rescue_from Discourse::InvalidAccess do |e|
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if e.opts[:delete_cookie].present?
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cookies.delete(e.opts[:delete_cookie])
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end
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rescue_discourse_actions(
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:invalid_access,
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403,
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include_ember: true,
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custom_message: e.custom_message
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)
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end
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rescue_from Discourse::ReadOnly do
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render_json_error I18n.t('read_only_mode_enabled'), type: :read_only, status: 503
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end
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def rescue_discourse_actions(type, status_code, opts = nil)
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opts ||= {}
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show_json_errors = (request.format && request.format.json?) ||
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(request.xhr?) ||
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((params[:external_id] || '').ends_with? '.json')
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message = opts[:custom_message_translated] || I18n.t(opts[:custom_message] || type)
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if show_json_errors
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# HACK: do not use render_json_error for topics#show
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if request.params[:controller] == 'topics' && request.params[:action] == 'show'
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return render status: status_code, layout: false, plain: (status_code == 404 || status_code == 410) ? build_not_found_page(status_code) : message
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end
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render_json_error message, type: type, status: status_code
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else
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begin
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# 404 pages won't have the session and theme_keys without these:
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current_user
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handle_theme
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rescue Discourse::InvalidAccess
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return render plain: message, status: status_code
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end
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render html: build_not_found_page(status_code, opts[:include_ember] ? 'application' : 'no_ember')
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end
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end
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# If a controller requires a plugin, it will raise an exception if that plugin is
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# disabled. This allows plugins to be disabled programatically.
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def self.requires_plugin(plugin_name)
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before_action do
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raise PluginDisabled.new if Discourse.disabled_plugin_names.include?(plugin_name)
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end
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end
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def set_current_user_for_logs
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if current_user
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Logster.add_to_env(request.env, "username", current_user.username)
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response.headers["X-Discourse-Username"] = current_user.username
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end
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response.headers["X-Discourse-Route"] = "#{controller_name}/#{action_name}"
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end
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def clear_notifications
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if current_user && !@readonly_mode
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cookie_notifications = cookies['cn']
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notifications = request.headers['Discourse-Clear-Notifications']
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if cookie_notifications
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if notifications.present?
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notifications += ",#{cookie_notifications}"
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else
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notifications = cookie_notifications
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end
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end
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if notifications.present?
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notification_ids = notifications.split(",").map(&:to_i)
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Notification.read(current_user, notification_ids)
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current_user.reload
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current_user.publish_notifications_state
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cookie_args = {}
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cookie_args[:path] = Discourse.base_uri if Discourse.base_uri.present?
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cookies.delete('cn', cookie_args)
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end
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end
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end
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def set_locale
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if !current_user
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if SiteSetting.set_locale_from_accept_language_header
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locale = locale_from_header
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else
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locale = SiteSetting.default_locale
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end
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else
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locale = current_user.effective_locale
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end
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I18n.locale = I18n.locale_available?(locale) ? locale : :en
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I18n.ensure_all_loaded!
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end
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def store_preloaded(key, json)
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@preloaded ||= {}
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# I dislike that there is a gsub as opposed to a gsub!
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# but we can not be mucking with user input, I wonder if there is a way
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# to inject this safty deeper in the library or even in AM serializer
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@preloaded[key] = json.gsub("</", "<\\/")
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end
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# If we are rendering HTML, preload the session data
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def preload_json
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# We don't preload JSON on xhr or JSON request
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return if request.xhr? || request.format.json?
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# if we are posting in makes no sense to preload
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return if request.method != "GET"
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# TODO should not be invoked on redirection so this should be further deferred
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preload_anonymous_data
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if current_user
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current_user.sync_notification_channel_position
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preload_current_user_data
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end
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end
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def set_mobile_view
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session[:mobile_view] = params[:mobile_view] if params.has_key?(:mobile_view)
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end
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NO_CUSTOM = "no_custom"
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NO_PLUGINS = "no_plugins"
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ONLY_OFFICIAL = "only_official"
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SAFE_MODE = "safe_mode"
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def resolve_safe_mode
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return unless guardian.can_enable_safe_mode?
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safe_mode = params[SAFE_MODE]
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if safe_mode
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request.env[NO_CUSTOM] = !!safe_mode.include?(NO_CUSTOM)
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request.env[NO_PLUGINS] = !!safe_mode.include?(NO_PLUGINS)
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request.env[ONLY_OFFICIAL] = !!safe_mode.include?(ONLY_OFFICIAL)
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end
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end
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def handle_theme
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return if request.xhr? || request.format == "json" || request.format == "js"
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return if request.method != "GET"
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resolve_safe_mode
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return if request.env[NO_CUSTOM]
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theme_id = request[:preview_theme_id]&.to_i
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user_option = current_user&.user_option
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unless theme_id
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ids, seq = cookies[:theme_ids]&.split("|")
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ids = ids&.split(",")&.map(&:to_i)
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if ids && ids.size > 0 && seq && seq.to_i == user_option&.theme_key_seq.to_i
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theme_id = ids.first
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end
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end
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theme_id ||= user_option&.theme_ids&.first
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if theme_id && !guardian.allow_themes?(theme_id)
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theme_id = nil
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end
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theme_id ||= SiteSetting.default_theme_id
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theme_id = nil if theme_id.blank? || theme_id == -1
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@theme_id = request.env[:resolved_theme_id] = theme_id
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end
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def guardian
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@guardian ||= Guardian.new(current_user)
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end
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def current_homepage
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current_user&.user_option&.homepage || SiteSetting.anonymous_homepage
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end
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def serialize_data(obj, serializer, opts = nil)
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# If it's an array, apply the serializer as an each_serializer to the elements
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serializer_opts = { scope: guardian }.merge!(opts || {})
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if obj.respond_to?(:to_ary)
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serializer_opts[:each_serializer] = serializer
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ActiveModel::ArraySerializer.new(obj.to_ary, serializer_opts).as_json
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else
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serializer.new(obj, serializer_opts).as_json
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end
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end
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# This is odd, but it seems that in Rails `render json: obj` is about
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# 20% slower than calling MultiJSON.dump ourselves. I'm not sure why
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# Rails doesn't call MultiJson.dump when you pass it json: obj but
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# it seems we don't need whatever Rails is doing.
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def render_serialized(obj, serializer, opts = nil)
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render_json_dump(serialize_data(obj, serializer, opts), opts)
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end
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def render_json_dump(obj, opts = nil)
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opts ||= {}
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if opts[:rest_serializer]
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obj['__rest_serializer'] = "1"
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opts.each do |k, v|
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obj[k] = v if k.to_s.start_with?("refresh_")
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end
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obj['extras'] = opts[:extras] if opts[:extras]
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obj['meta'] = opts[:meta] if opts[:meta]
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end
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render json: MultiJson.dump(obj), status: opts[:status] || 200
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end
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def can_cache_content?
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current_user.blank? && flash[:authentication_data].blank?
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end
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# Our custom cache method
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def discourse_expires_in(time_length)
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return unless can_cache_content?
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Middleware::AnonymousCache.anon_cache(request.env, time_length)
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end
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def fetch_user_from_params(opts = nil, eager_load = [])
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opts ||= {}
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user = if params[:username]
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username_lower = params[:username].downcase.chomp('.json')
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find_opts = { username_lower: username_lower }
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find_opts[:active] = true unless opts[:include_inactive] || current_user.try(:staff?)
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result = User
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(result = result.includes(*eager_load)) if !eager_load.empty?
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result.find_by(find_opts)
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elsif params[:external_id]
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external_id = params[:external_id].chomp('.json')
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SingleSignOnRecord.find_by(external_id: external_id).try(:user)
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end
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raise Discourse::NotFound if user.blank?
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guardian.ensure_can_see!(user)
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user
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end
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def post_ids_including_replies
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post_ids = params[:post_ids].map(&:to_i)
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post_ids |= PostReply.where(post_id: params[:reply_post_ids]).pluck(:reply_id) if params[:reply_post_ids]
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post_ids
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end
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def no_cookies
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# do your best to ensure response has no cookies
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# longer term we may want to push this into middleware
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headers.delete 'Set-Cookie'
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request.session_options[:skip] = true
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end
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def permalink_redirect_or_not_found
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url = request.fullpath
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permalink = Permalink.find_by_url(url)
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if permalink.present?
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# permalink present, redirect to that URL
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if permalink.external_url
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redirect_to permalink.external_url, status: :moved_permanently
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elsif permalink.target_url
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redirect_to "#{Discourse::base_uri}#{permalink.target_url}", status: :moved_permanently
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else
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raise Discourse::NotFound
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end
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else
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# redirect to 404
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raise Discourse::NotFound
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end
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end
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def secure_session
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SecureSession.new(session["secure_session_id"] ||= SecureRandom.hex)
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end
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private
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def check_readonly_mode
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@readonly_mode = Discourse.readonly_mode?
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end
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def locale_from_header
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begin
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# Rails I18n uses underscores between the locale and the region; the request
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# headers use hyphens.
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require 'http_accept_language' unless defined? HttpAcceptLanguage
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available_locales = I18n.available_locales.map { |locale| locale.to_s.tr('_', '-') }
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parser = HttpAcceptLanguage::Parser.new(request.env["HTTP_ACCEPT_LANGUAGE"])
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parser.language_region_compatible_from(available_locales).tr('-', '_')
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rescue
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# If Accept-Language headers are not set.
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I18n.default_locale
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end
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end
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def preload_anonymous_data
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store_preloaded("site", Site.json_for(guardian))
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store_preloaded("siteSettings", SiteSetting.client_settings_json)
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store_preloaded("customHTML", custom_html_json)
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store_preloaded("banner", banner_json)
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store_preloaded("customEmoji", custom_emoji)
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store_preloaded("translationOverrides", I18n.client_overrides_json(I18n.locale))
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end
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def preload_current_user_data
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store_preloaded("currentUser", MultiJson.dump(CurrentUserSerializer.new(current_user, scope: guardian, root: false)))
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report = TopicTrackingState.report(current_user)
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serializer = ActiveModel::ArraySerializer.new(report, each_serializer: TopicTrackingStateSerializer)
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store_preloaded("topicTrackingStates", MultiJson.dump(serializer))
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end
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def custom_html_json
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target = view_context.mobile_view? ? :mobile : :desktop
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data =
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if @theme_id
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{
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top: Theme.lookup_field(@theme_id, target, "after_header"),
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footer: Theme.lookup_field(@theme_id, target, "footer")
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}
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else
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{}
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end
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if DiscoursePluginRegistry.custom_html
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data.merge! DiscoursePluginRegistry.custom_html
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end
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DiscoursePluginRegistry.html_builders.each do |name, _|
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if name.start_with?("client:")
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data[name.sub(/^client:/, '')] = DiscoursePluginRegistry.build_html(name, self)
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end
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end
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|
MultiJson.dump(data)
|
|
end
|
|
|
|
def self.banner_json_cache
|
|
@banner_json_cache ||= DistributedCache.new("banner_json")
|
|
end
|
|
|
|
def banner_json
|
|
json = ApplicationController.banner_json_cache["json"]
|
|
|
|
unless json
|
|
topic = Topic.where(archetype: Archetype.banner).first
|
|
banner = topic.present? ? topic.banner : {}
|
|
ApplicationController.banner_json_cache["json"] = json = MultiJson.dump(banner)
|
|
end
|
|
|
|
json
|
|
end
|
|
|
|
def custom_emoji
|
|
serializer = ActiveModel::ArraySerializer.new(Emoji.custom, each_serializer: EmojiSerializer)
|
|
MultiJson.dump(serializer)
|
|
end
|
|
|
|
# Render action for a JSON error.
|
|
#
|
|
# obj - a translated string, an ActiveRecord model, or an array of translated strings
|
|
# opts:
|
|
# type - a machine-readable description of the error
|
|
# status - HTTP status code to return
|
|
# headers - extra headers for the response
|
|
def render_json_error(obj, opts = {})
|
|
opts = { status: opts } if opts.is_a?(Integer)
|
|
opts.fetch(:headers, {}).each { |name, value| headers[name.to_s] = value }
|
|
|
|
render json: MultiJson.dump(create_errors_json(obj, opts)), status: opts[:status] || 422
|
|
end
|
|
|
|
def success_json
|
|
{ success: 'OK' }
|
|
end
|
|
|
|
def failed_json
|
|
{ failed: 'FAILED' }
|
|
end
|
|
|
|
def json_result(obj, opts = {})
|
|
if yield(obj)
|
|
json = success_json
|
|
|
|
# If we were given a serializer, add the class to the json that comes back
|
|
if opts[:serializer].present?
|
|
json[obj.class.name.underscore] = opts[:serializer].new(obj, scope: guardian).serializable_hash
|
|
end
|
|
|
|
render json: MultiJson.dump(json)
|
|
else
|
|
error_obj = nil
|
|
if opts[:additional_errors]
|
|
error_target = opts[:additional_errors].find do |o|
|
|
target = obj.send(o)
|
|
target && target.errors.present?
|
|
end
|
|
error_obj = obj.send(error_target) if error_target
|
|
end
|
|
render_json_error(error_obj || obj)
|
|
end
|
|
end
|
|
|
|
def mini_profiler_enabled?
|
|
defined?(Rack::MiniProfiler) && (guardian.is_developer? || Rails.env.development?)
|
|
end
|
|
|
|
def authorize_mini_profiler
|
|
return unless mini_profiler_enabled?
|
|
Rack::MiniProfiler.authorize_request
|
|
end
|
|
|
|
def check_xhr
|
|
# bypass xhr check on PUT / POST / DELETE provided api key is there, otherwise calling api is annoying
|
|
return if !request.get? && (is_api? || is_user_api?)
|
|
raise RenderEmpty.new unless ((request.format && request.format.json?) || request.xhr?)
|
|
end
|
|
|
|
def self.requires_login(arg = {})
|
|
@requires_login_arg = arg
|
|
end
|
|
|
|
def self.requires_login_arg
|
|
@requires_login_arg
|
|
end
|
|
|
|
def block_if_requires_login
|
|
if arg = self.class.requires_login_arg
|
|
check =
|
|
if except = arg[:except]
|
|
!except.include?(action_name.to_sym)
|
|
elsif only = arg[:only]
|
|
only.include?(action_name.to_sym)
|
|
else
|
|
true
|
|
end
|
|
ensure_logged_in if check
|
|
end
|
|
end
|
|
|
|
def ensure_logged_in
|
|
raise Discourse::NotLoggedIn.new unless current_user.present?
|
|
end
|
|
|
|
def ensure_staff
|
|
raise Discourse::InvalidAccess.new unless current_user && current_user.staff?
|
|
end
|
|
|
|
def ensure_admin
|
|
raise Discourse::InvalidAccess.new unless current_user && current_user.admin?
|
|
end
|
|
|
|
def ensure_wizard_enabled
|
|
raise Discourse::InvalidAccess.new unless SiteSetting.wizard_enabled?
|
|
end
|
|
|
|
def destination_url
|
|
request.original_url unless request.original_url =~ /uploads/
|
|
end
|
|
|
|
def redirect_to_login_if_required
|
|
return if current_user || (request.format.json? && is_api?)
|
|
|
|
if SiteSetting.login_required?
|
|
flash.keep
|
|
|
|
if SiteSetting.enable_sso?
|
|
# save original URL in a session so we can redirect after login
|
|
session[:destination_url] = destination_url
|
|
redirect_to path('/session/sso')
|
|
elsif params[:authComplete].present?
|
|
redirect_to path("/login?authComplete=true")
|
|
else
|
|
# save original URL in a cookie (javascript redirects after login in this case)
|
|
cookies[:destination_url] = destination_url
|
|
redirect_to path("/login")
|
|
end
|
|
end
|
|
end
|
|
|
|
def block_if_readonly_mode
|
|
return if request.fullpath.start_with?(path "/admin/backups")
|
|
raise Discourse::ReadOnly.new if !(request.get? || request.head?) && @readonly_mode
|
|
end
|
|
|
|
def build_not_found_page(status = 404, layout = false)
|
|
if SiteSetting.bootstrap_error_pages?
|
|
preload_json
|
|
layout = 'application' if layout == 'no_ember'
|
|
end
|
|
|
|
category_topic_ids = Category.pluck(:topic_id).compact
|
|
@container_class = "wrap not-found-container"
|
|
@top_viewed = TopicQuery.new(nil, except_topic_ids: category_topic_ids).list_top_for("monthly").topics.first(10)
|
|
@recent = Topic.includes(:category).where.not(id: category_topic_ids).recent(10)
|
|
@slug = params[:slug].class == String ? params[:slug] : ''
|
|
@slug = (params[:id].class == String ? params[:id] : '') if @slug.blank?
|
|
@slug.tr!('-', ' ')
|
|
@hide_google = true if SiteSetting.login_required
|
|
render_to_string status: status, layout: layout, formats: [:html], template: '/exceptions/not_found'
|
|
end
|
|
|
|
def is_asset_path
|
|
request.env['DISCOURSE_IS_ASSET_PATH'] = 1
|
|
end
|
|
|
|
protected
|
|
|
|
def render_post_json(post, add_raw = true)
|
|
post_serializer = PostSerializer.new(post, scope: guardian, root: false)
|
|
post_serializer.add_raw = add_raw
|
|
|
|
counts = PostAction.counts_for([post], current_user)
|
|
if counts && counts = counts[post.id]
|
|
post_serializer.post_actions = counts
|
|
end
|
|
render_json_dump(post_serializer)
|
|
end
|
|
|
|
# returns an array of integers given a param key
|
|
# returns nil if key is not found
|
|
def param_to_integer_list(key, delimiter = ',')
|
|
if params[key]
|
|
params[key].split(delimiter).map(&:to_i)
|
|
end
|
|
end
|
|
|
|
end
|