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mastodon/app/services/subscribe_service.rb

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# frozen_string_literal: true
class SubscribeService < BaseService
def call(account)
return if account.hub_url.blank?
@account = account
@account.secret = SecureRandom.hex
build_request.perform do |response|
if response_failed_permanently? response
# We're not allowed to subscribe. Fail and move on.
@account.secret = ''
@account.save!
elsif response_successful? response
# The subscription will be confirmed asynchronously.
@account.save!
else
# The response was either a 429 rate limit, or a 5xx error.
# We need to retry at a later time. Fail loudly!
raise Mastodon::UnexpectedResponseError, response
end
end
end
private
def build_request
request = Request.new(:post, @account.hub_url, form: subscription_params)
request.on_behalf_of(some_local_account) if some_local_account
request
end
def subscription_params
{
'hub.topic': @account.remote_url,
'hub.mode': 'subscribe',
'hub.callback': api_subscription_url(@account.id),
'hub.verify': 'async',
'hub.secret': @account.secret,
'hub.lease_seconds': 7.days.seconds,
}
end
def some_local_account
@some_local_account ||= Account.local.where(suspended: false).first
end
# Any response in the 3xx or 4xx range, except for 429 (rate limit)
def response_failed_permanently?(response)
(response.status.redirect? || response.status.client_error?) && !response.status.too_many_requests?
end
# Any response in the 2xx range
def response_successful?(response)
response.status.success?
end
end