413 lines
12 KiB
Ruby
413 lines
12 KiB
Ruby
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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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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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?
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super
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clear_current_user
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render text: "['BAD CSRF']", status: 403
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end
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end
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before_filter :set_current_user_for_logs
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before_filter :set_locale
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before_filter :set_mobile_view
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before_filter :inject_preview_style
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before_filter :disable_customization
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before_filter :block_if_readonly_mode
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before_filter :authorize_mini_profiler
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before_filter :preload_json
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before_filter :check_xhr
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before_filter :redirect_to_login_if_required
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layout :set_layout
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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 ||= (has_escaped_fragment? || CrawlerDetection.crawler?(request.user_agent))
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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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rescue_from Exception do |exception|
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unless [ActiveRecord::RecordNotFound,
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ActionController::RoutingError,
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ActionController::UnknownController,
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AbstractController::ActionNotFound].include? exception.class
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begin
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ErrorLog.report_async!(exception, self, request, current_user)
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rescue
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# dont care give up
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end
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end
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raise
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end
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# Some exceptions
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class RenderEmpty < Exception; end
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# Render nothing unless we are an xhr request
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rescue_from RenderEmpty do
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render 'default/empty'
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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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time_left = ""
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if e.available_in < 1.minute.to_i
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time_left = I18n.t("rate_limiter.seconds", count: e.available_in)
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elsif e.available_in < 1.hour.to_i
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time_left = I18n.t("rate_limiter.minutes", count: (e.available_in / 1.minute.to_i))
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else
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time_left = I18n.t("rate_limiter.hours", count: (e.available_in / 1.hour.to_i))
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end
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render json: {errors: [I18n.t("rate_limiter.too_many_requests", time_left: time_left)]}, status: 429
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end
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rescue_from Discourse::NotLoggedIn do |e|
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raise e if Rails.env.test?
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if request.get?
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redirect_to "/"
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else
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render status: 403, json: failed_json.merge(message: I18n.t(:not_logged_in))
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end
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end
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rescue_from Discourse::NotFound do
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rescue_discourse_actions("[error: 'not found']", 404) # TODO: this breaks json responses
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end
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rescue_from Discourse::InvalidAccess do
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rescue_discourse_actions("[error: 'invalid access']", 403, true) # TODO: this breaks json responses
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end
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rescue_from Discourse::ReadOnly do
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render status: 405, json: failed_json.merge(message: I18n.t("read_only_mode_enabled"))
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end
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def rescue_discourse_actions(message, error, include_ember=false)
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if request.format && request.format.json?
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# TODO: this doesn't make sense. Stuffing an html page into a json response will cause
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# $.parseJSON to fail in the browser. Also returning text like "[error: 'invalid access']"
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# from the above rescue_from blocks will fail because that isn't valid json.
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render status: error, layout: false, text: (error == 404) ? build_not_found_page(error) : message
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else
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render text: build_not_found_page(error, include_ember ? 'application' : 'no_js')
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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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end
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end
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def set_locale
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I18n.locale = if SiteSetting.allow_user_locale && current_user && current_user.locale.present?
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current_user.locale
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else
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SiteSetting.default_locale
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end
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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?
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preload_anonymous_data
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if current_user
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preload_current_user_data
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current_user.sync_notification_channel_position
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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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def inject_preview_style
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style = request['preview-style']
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if style.nil?
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session[:preview_style] = cookies[:preview_style]
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else
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cookies.delete(:preview_style)
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if style.blank? || style == 'default'
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session[:preview_style] = nil
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else
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session[:preview_style] = style
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if request['sticky']
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cookies[:preview_style] = style
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end
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end
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end
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end
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def disable_customization
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session[:disable_customization] = params[:customization] == "0" if params.has_key?(:customization)
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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 serialize_data(obj, serializer, opts={})
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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={})
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render_json_dump(serialize_data(obj, serializer, opts))
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end
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def render_json_dump(obj)
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render json: MultiJson.dump(obj)
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end
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def can_cache_content?
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!current_user.present?
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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)
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opts ||= {}
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user = if params[:username]
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username_lower = params[:username].downcase
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username_lower.gsub!(/\.json$/, '')
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find_opts = {username_lower: username_lower}
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find_opts[:active] = true unless opts[:include_inactive]
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User.find_by(find_opts)
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elsif params[:external_id]
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SingleSignOnRecord.find_by(external_id: params[:external_id]).try(:user)
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end
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raise Discourse::NotFound.new 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 {|p| p.to_i}
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if params[:reply_post_ids]
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post_ids << PostReply.where(post_id: params[:reply_post_ids].map {|p| p.to_i}).pluck(:reply_id)
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post_ids.flatten!
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post_ids.uniq!
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end
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post_ids
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end
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private
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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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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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serializer = ActiveModel::ArraySerializer.new(TopicTrackingState.report([current_user.id]), 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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data = {
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top: SiteText.text_for(:top),
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footer: SiteCustomization.custom_footer(session[:preview_style])
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}
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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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MultiJson.dump(data)
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end
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def self.banner_json_cache
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@banner_json_cache ||= DistributedCache.new("banner_json")
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end
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def banner_json
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json = ApplicationController.banner_json_cache["json"]
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unless json
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topic = Topic.where(archetype: Archetype.banner).limit(1).first
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banner = topic.present? ? topic.banner : {}
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ApplicationController.banner_json_cache["json"] = json = MultiJson.dump(banner)
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end
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json
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end
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def custom_emoji
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serializer = ActiveModel::ArraySerializer.new(Emoji.custom, each_serializer: EmojiSerializer)
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MultiJson.dump(serializer)
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end
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def render_json_error(obj)
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render json: MultiJson.dump(create_errors_json(obj)), status: 422
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end
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def success_json
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{ success: 'OK' }
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end
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def failed_json
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{ failed: 'FAILED' }
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end
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def json_result(obj, opts={})
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if yield(obj)
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json = success_json
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# If we were given a serializer, add the class to the json that comes back
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if opts[:serializer].present?
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json[obj.class.name.underscore] = opts[:serializer].new(obj, scope: guardian).serializable_hash
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end
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render json: MultiJson.dump(json)
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else
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error_obj = nil
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if opts[:additional_errors]
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error_target = opts[:additional_errors].find do |o|
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target = obj.send(o)
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target && target.errors.present?
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end
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error_obj = obj.send(error_target) if error_target
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end
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render_json_error(error_obj || obj)
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end
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end
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def mini_profiler_enabled?
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defined?(Rack::MiniProfiler) && guardian.is_developer?
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end
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def authorize_mini_profiler
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return unless mini_profiler_enabled?
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Rack::MiniProfiler.authorize_request
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end
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def check_xhr
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# bypass xhr check on PUT / POST / DELETE provided api key is there, otherwise calling api is annoying
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return if !request.get? && api_key_valid?
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raise RenderEmpty.new unless ((request.format && request.format.json?) || request.xhr?)
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end
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def ensure_logged_in
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raise Discourse::NotLoggedIn.new unless current_user.present?
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end
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def redirect_to_login_if_required
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return if current_user || (request.format.json? && api_key_valid?)
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# save original URL in a cookie
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cookies[:destination_url] = request.original_url unless request.original_url =~ /uploads/
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redirect_to :login if SiteSetting.login_required?
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end
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def block_if_readonly_mode
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return if request.fullpath.start_with?("/admin/backups")
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raise Discourse::ReadOnly.new if !request.get? && Discourse.readonly_mode?
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end
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def build_not_found_page(status=404, layout=false)
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category_topic_ids = Category.pluck(:topic_id).compact
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@top_viewed = Topic.where.not(id: category_topic_ids).top_viewed(10)
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@recent = Topic.where.not(id: category_topic_ids).recent(10)
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@slug = params[:slug].class == String ? params[:slug] : ''
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@slug = (params[:id].class == String ? params[:id] : '') if @slug.blank?
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@slug.gsub!('-',' ')
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render_to_string status: status, layout: layout, formats: [:html], template: '/exceptions/not_found'
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end
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protected
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def render_post_json(post, add_raw=true)
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post_serializer = PostSerializer.new(post, scope: guardian, root: false)
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post_serializer.add_raw = add_raw
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counts = PostAction.counts_for([post], current_user)
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if counts && counts = counts[post.id]
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post_serializer.post_actions = counts
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end
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render_json_dump(post_serializer)
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end
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def api_key_valid?
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request["api_key"] && ApiKey.where(key: request["api_key"]).exists?
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end
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# returns an array of integers given a param key
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# returns nil if key is not found
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def param_to_integer_list(key, delimiter = ',')
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if params[key]
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params[key].split(delimiter).map(&:to_i)
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end
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end
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end
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