discourse/app/controllers/application_controller.rb

340 lines
10 KiB
Ruby

require 'current_user'
require_dependency 'canonical_url'
require_dependency 'discourse'
require_dependency 'custom_renderer'
require_dependency 'archetype'
require_dependency 'rate_limiter'
require_dependency 'crawler_detection'
require_dependency 'json_error'
require_dependency 'letter_avatar'
class ApplicationController < ActionController::Base
include CurrentUser
include CanonicalURL::ControllerExtensions
include JsonError
serialization_scope :guardian
protect_from_forgery
# Default Rails 3.2 lets the request through with a blank session
# we are being more pedantic here and nulling session / current_user
# and then raising a CSRF exception
def handle_unverified_request
# NOTE: API key is secret, having it invalidates the need for a CSRF token
unless is_api?
super
clear_current_user
render text: "['BAD CSRF']", status: 403
end
end
before_filter :set_current_user_for_logs
before_filter :set_locale
before_filter :set_mobile_view
before_filter :inject_preview_style
before_filter :disable_customization
before_filter :block_if_readonly_mode
before_filter :authorize_mini_profiler
before_filter :store_incoming_links
before_filter :preload_json
before_filter :check_xhr
before_filter :redirect_to_login_if_required
layout :set_layout
def has_escaped_fragment?
SiteSetting.enable_escaped_fragments? && params.key?("_escaped_fragment_")
end
def set_layout
has_escaped_fragment? || CrawlerDetection.crawler?(request.user_agent) ? 'crawler' : 'application'
end
rescue_from Exception do |exception|
unless [ActiveRecord::RecordNotFound,
ActionController::RoutingError,
ActionController::UnknownController,
AbstractController::ActionNotFound].include? exception.class
begin
ErrorLog.report_async!(exception, self, request, current_user)
rescue
# dont care give up
end
end
raise
end
# Some exceptions
class RenderEmpty < Exception; end
# Render nothing unless we are an xhr request
rescue_from RenderEmpty do
render 'default/empty'
end
# If they hit the rate limiter
rescue_from RateLimiter::LimitExceeded do |e|
time_left = ""
if e.available_in < 1.minute.to_i
time_left = I18n.t("rate_limiter.seconds", count: e.available_in)
elsif e.available_in < 1.hour.to_i
time_left = I18n.t("rate_limiter.minutes", count: (e.available_in / 1.minute.to_i))
else
time_left = I18n.t("rate_limiter.hours", count: (e.available_in / 1.hour.to_i))
end
render json: {errors: [I18n.t("rate_limiter.too_many_requests", time_left: time_left)]}, status: 429
end
rescue_from Discourse::NotLoggedIn do |e|
raise e if Rails.env.test?
if request.get?
redirect_to "/"
else
render status: 403, json: failed_json.merge(message: I18n.t(:not_logged_in))
end
end
rescue_from Discourse::NotFound do
rescue_discourse_actions("[error: 'not found']", 404) # TODO: this breaks json responses
end
rescue_from Discourse::InvalidAccess do
rescue_discourse_actions("[error: 'invalid access']", 403, true) # TODO: this breaks json responses
end
rescue_from Discourse::ReadOnly do
render status: 405, json: failed_json.merge(message: I18n.t("read_only_mode_enabled"))
end
def rescue_discourse_actions(message, error, include_ember=false)
if request.format && request.format.json?
# TODO: this doesn't make sense. Stuffing an html page into a json response will cause
# $.parseJSON to fail in the browser. Also returning text like "[error: 'invalid access']"
# from the above rescue_from blocks will fail because that isn't valid json.
render status: error, layout: false, text: (error == 404) ? build_not_found_page(error) : message
else
render text: build_not_found_page(error, include_ember ? 'application' : 'no_js')
end
end
def set_current_user_for_logs
if current_user
Logster.add_to_env(request.env,"username",current_user.username)
end
end
def set_locale
I18n.locale = if SiteSetting.allow_user_locale && current_user && current_user.locale.present?
current_user.locale
else
SiteSetting.default_locale
end
end
def store_preloaded(key, json)
@preloaded ||= {}
# I dislike that there is a gsub as opposed to a gsub!
# but we can not be mucking with user input, I wonder if there is a way
# to inject this safty deeper in the library or even in AM serializer
@preloaded[key] = json.gsub("</", "<\\/")
end
# If we are rendering HTML, preload the session data
def preload_json
# We don't preload JSON on xhr or JSON request
return if request.xhr?
preload_anonymous_data
if current_user
preload_current_user_data
current_user.sync_notification_channel_position
end
end
def set_mobile_view
session[:mobile_view] = params[:mobile_view] if params.has_key?(:mobile_view)
end
def inject_preview_style
style = request['preview-style']
session[:preview_style] = style if style
end
def disable_customization
session[:disable_customization] = params[:customization] == "0" if params.has_key?(:customization)
end
def guardian
@guardian ||= Guardian.new(current_user)
end
def serialize_data(obj, serializer, opts={})
# If it's an array, apply the serializer as an each_serializer to the elements
serializer_opts = {scope: guardian}.merge!(opts)
if obj.respond_to?(:to_ary)
serializer_opts[:each_serializer] = serializer
ActiveModel::ArraySerializer.new(obj.to_ary, serializer_opts).as_json
else
serializer.new(obj, serializer_opts).as_json
end
end
# This is odd, but it seems that in Rails `render json: obj` is about
# 20% slower than calling MultiJSON.dump ourselves. I'm not sure why
# Rails doesn't call MultiJson.dump when you pass it json: obj but
# it seems we don't need whatever Rails is doing.
def render_serialized(obj, serializer, opts={})
render_json_dump(serialize_data(obj, serializer, opts))
end
def render_json_dump(obj)
render json: MultiJson.dump(obj)
end
def can_cache_content?
!current_user.present?
end
# Our custom cache method
def discourse_expires_in(time_length)
return unless can_cache_content?
Middleware::AnonymousCache.anon_cache(request.env, time_length)
end
def fetch_user_from_params
username_lower = params[:username].downcase
username_lower.gsub!(/\.json$/, '')
user = User.find_by(username_lower: username_lower)
raise Discourse::NotFound.new if user.blank?
guardian.ensure_can_see!(user)
user
end
def post_ids_including_replies
post_ids = params[:post_ids].map {|p| p.to_i}
if params[:reply_post_ids]
post_ids << PostReply.where(post_id: params[:reply_post_ids].map {|p| p.to_i}).pluck(:reply_id)
post_ids.flatten!
post_ids.uniq!
end
post_ids
end
private
def preload_anonymous_data
store_preloaded("site", Site.json_for(guardian))
store_preloaded("siteSettings", SiteSetting.client_settings_json)
store_preloaded("customHTML", custom_html_json)
end
def preload_current_user_data
store_preloaded("currentUser", MultiJson.dump(CurrentUserSerializer.new(current_user, scope: guardian, root: false)))
serializer = ActiveModel::ArraySerializer.new(TopicTrackingState.report([current_user.id]), each_serializer: TopicTrackingStateSerializer)
store_preloaded("topicTrackingStates", MultiJson.dump(serializer))
end
def custom_html_json
MultiJson.dump({
top: SiteContent.content_for(:top),
bottom: SiteContent.content_for(:bottom)
}.merge(
(SiteSetting.tos_accept_required && !current_user) ? {tos_signup_form_message: SiteContent.content_for(:tos_signup_form_message)} : {}
))
end
def render_json_error(obj)
render json: MultiJson.dump(create_errors_json(obj)), 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
render_json_error(obj)
end
end
def mini_profiler_enabled?
defined?(Rack::MiniProfiler) && current_user.try(:admin?)
end
def authorize_mini_profiler
return unless mini_profiler_enabled?
Rack::MiniProfiler.authorize_request
end
def store_incoming_links
IncomingLink.add(request,current_user) unless request.xhr?
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? && api_key_valid?
raise RenderEmpty.new unless ((request.format && request.format.json?) || request.xhr?)
end
def ensure_logged_in
raise Discourse::NotLoggedIn.new unless current_user.present?
end
def redirect_to_login_if_required
return if current_user || (request.format.json? && api_key_valid?)
redirect_to :login if SiteSetting.login_required?
end
def block_if_readonly_mode
return if request.fullpath.start_with?("/admin/backups")
raise Discourse::ReadOnly.new if !request.get? && Discourse.readonly_mode?
end
def build_not_found_page(status=404, layout=false)
@top_viewed = Topic.top_viewed(10)
@recent = Topic.recent(10)
@slug = params[:slug].class == String ? params[:slug] : ''
@slug = (params[:id].class == String ? params[:id] : '') if @slug.blank?
@slug.gsub!('-',' ')
render_to_string status: status, layout: layout, formats: [:html], template: '/exceptions/not_found'
end
protected
def api_key_valid?
request["api_key"] && ApiKey.where(key: request["api_key"]).exists?
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