mastodon/app/controllers/concerns/captcha_concern.rb
Claire 1b493c9fee Add optional hCaptcha support
Fixes #1649

This requires setting `HCAPTCHA_SECRET_KEY` and `HCAPTCHA_SITE_KEY`, then
enabling the admin setting at
`/admin/settings/edit#form_admin_settings_captcha_enabled`

Subsequently, a hCaptcha widget will be displayed on `/about` and
`/auth/sign_up` unless:
- the user is already signed-up already
- the user has used an invite link
- the user has already solved the captcha (and registration failed for another
  reason)

The Content-Security-Policy headers are altered automatically to allow the
third-party hCaptcha scripts on `/about` and `/auth/sign_up` following the same
rules as above.
2022-01-24 21:22:13 +01:00

67 lines
1.7 KiB
Ruby

# frozen_string_literal: true
module CaptchaConcern
extend ActiveSupport::Concern
include Hcaptcha::Adapters::ViewMethods
CAPTCHA_TIMEOUT = 2.hours.freeze
included do
helper_method :render_captcha_if_needed
end
def captcha_available?
ENV['HCAPTCHA_SECRET_KEY'].present? && ENV['HCAPTCHA_SITE_KEY'].present?
end
def captcha_enabled?
captcha_available? && Setting.captcha_enabled
end
def captcha_recently_passed?
session[:captcha_passed_at].present? && session[:captcha_passed_at] >= CAPTCHA_TIMEOUT.ago
end
def captcha_required?
captcha_enabled? && !current_user && !(@invite.present? && @invite.valid_for_use? && !@invite.max_uses.nil?) && !captcha_recently_passed?
end
def clear_captcha!
session.delete(:captcha_passed_at)
end
def check_captcha!
return true unless captcha_required?
if verify_hcaptcha
session[:captcha_passed_at] = Time.now.utc
return true
else
if block_given?
message = flash[:hcaptcha_error]
flash.delete(:hcaptcha_error)
yield message
end
return false
end
end
def extend_csp_for_captcha!
policy = request.content_security_policy
return unless captcha_required? && policy.present?
%w(script_src frame_src style_src connect_src).each do |directive|
values = policy.send(directive)
values << 'https://hcaptcha.com' unless values.include?('https://hcaptcha.com') || values.include?('https:')
values << 'https://*.hcaptcha.com' unless values.include?('https://*.hcaptcha.com') || values.include?('https:')
policy.send(directive, *values)
end
end
def render_captcha_if_needed
return unless captcha_required?
hcaptcha_tags
end
end