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# frozen_string_literal: true
class Pubsubhubbub::SubscribeService < BaseService
URL_PATTERN = /\A#{URI.regexp(%w(http https))}\z/
attr_reader :account, :callback, :secret, :lease_seconds
def call(account, callback, secret, lease_seconds)
@account = account
@callback = callback
@secret = secret
@lease_seconds = lease_seconds
process_subscribe
end
private
def process_subscribe
case subscribe_status
when :invalid_topic
['Invalid topic URL', 422]
when :invalid_callback
['Invalid callback URL', 422]
when :callback_not_allowed
['Callback URL not allowed', 403]
when :valid
confirm_subscription
['', 202]
end
end
def subscribe_status
if account.nil?
:invalid_topic
elsif !valid_callback?
:invalid_callback
elsif blocked_domain?
:callback_not_allowed
else
:valid
end
end
def confirm_subscription
subscription = locate_subscription
Pubsubhubbub::ConfirmationWorker.perform_async(subscription.id, 'subscribe', secret, lease_seconds)
end
def valid_callback?
callback.present? && callback =~ URL_PATTERN
end
def blocked_domain?
DomainBlock.blocked? Addressable::URI.parse(callback).normalize.host
end
def locate_subscription
Subscription.where(account: account, callback_url: callback).first_or_create!(account: account, callback_url: callback)
end
end
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