discourse/config/initializers/008-rack-cors.rb
Rafael dos Santos Silva b301a6b3db
FEATURE: Cache CORS preflight requests for 2h ()
* FEATURE: Cache CORS preflight requests for 2h

Browsers will cache this for 5 seconds by default. If using MessageBus
in a different domain, Discourse will issue a new long polling, by
default, every 30s or so. This means we would be issuing a new preflight
request **every time**. This can be incredibly wasteful, so let's cache
the authorization in the client for 2h, which is the maximum Chromium
allows us as of today.

* fix tests
2021-10-14 22:37:53 -03:00

58 lines
1.9 KiB
Ruby

# frozen_string_literal: true
class Discourse::Cors
ORIGINS_ENV = "Discourse_Cors_Origins"
def initialize(app, options = nil)
@app = app
if GlobalSetting.enable_cors && GlobalSetting.cors_origin.present?
@global_origins = GlobalSetting.cors_origin.split(',').map { |x| x.strip.chomp('/') }
end
end
def call(env)
cors_origins = @global_origins || []
cors_origins += SiteSetting.cors_origins.split('|') if SiteSetting.cors_origins.present?
cors_origins = cors_origins.presence
if env['REQUEST_METHOD'] == ('OPTIONS') && env['HTTP_ACCESS_CONTROL_REQUEST_METHOD']
return [200, Discourse::Cors.apply_headers(cors_origins, env, {}), []]
end
env[Discourse::Cors::ORIGINS_ENV] = cors_origins if cors_origins
status, headers, body = @app.call(env)
headers ||= {}
Discourse::Cors.apply_headers(cors_origins, env, headers)
[status, headers, body]
end
def self.apply_headers(cors_origins, env, headers)
request_method = env['REQUEST_METHOD']
if env['REQUEST_PATH'] =~ /\/(javascripts|assets)\// && Discourse.is_cdn_request?(env, request_method)
Discourse.apply_cdn_headers(headers)
elsif cors_origins
origin = nil
if origin = env['HTTP_ORIGIN']
origin = nil unless cors_origins.include?(origin)
end
headers['Access-Control-Allow-Origin'] = origin || cors_origins[0]
headers['Access-Control-Allow-Headers'] = 'Content-Type, Cache-Control, X-Requested-With, X-CSRF-Token, Discourse-Present, User-Api-Key, User-Api-Client-Id, Authorization'
headers['Access-Control-Allow-Credentials'] = 'true'
headers['Access-Control-Allow-Methods'] = 'POST, PUT, GET, OPTIONS, DELETE'
headers['Access-Control-Max-Age'] = '7200'
end
headers
end
end
if GlobalSetting.enable_cors || GlobalSetting.cdn_url
Rails.configuration.middleware.insert_before ActionDispatch::Flash, Discourse::Cors
end