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# rubocop:disable Naming/FileName
# frozen_string_literal: true
module ObjectStorage
module CDN
class GoogleCDN
include Gitlab::Utils::StrongMemoize
attr_reader :options
def initialize(options)
@options = HashWithIndifferentAccess.new(options.to_h)
GoogleIpCache.async_refresh unless GoogleIpCache.ready?
end
def use_cdn?(request_ip)
return false unless config_valid?
ip = IPAddr.new(request_ip)
return false if ip.private? || ip.link_local? || ip.loopback?
!GoogleIpCache.google_ip?(request_ip)
end
def signed_url(path, expiry: 10.minutes, params: {})
expiration = (Time.current + expiry).utc.to_i
uri = Addressable::URI.parse(cdn_url)
uri.path = path
# Use an Array to preserve order: Google CDN needs to have
# Expires, KeyName, and Signature in that order or it will return a 403 error:
# https://cloud.google.com/cdn/docs/troubleshooting-steps#signing
query_params = params.to_a
query_params << ['Expires', expiration]
query_params << ['KeyName', key_name]
uri.query_values = query_params
unsigned_url = uri.to_s
signature = OpenSSL::HMAC.digest('SHA1', decoded_key, unsigned_url)
encoded_signature = Base64.urlsafe_encode64(signature)
"#{unsigned_url}&Signature=#{encoded_signature}"
end
private
def config_valid?
[key_name, decoded_key, cdn_url].all?(&:present?) && cdn_url.start_with?('https://')
end
def key_name
strong_memoize(:key_name) do
options['key_name']
end
end
def decoded_key
strong_memoize(:decoded_key) do
Base64.urlsafe_decode64(options['key']) if options['key']
rescue ArgumentError
Gitlab::ErrorTracking.log_exception(ArgumentError.new("Google CDN key is not base64-encoded"))
nil
end
end
def cdn_url
strong_memoize(:cdn_url) do
options['url']
end
end
end
end
end
# rubocop:enable Naming/FileName
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