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class FetchRemoteStatusService < BaseService
def call(url)
response = http_client.head(url)
Rails.logger.debug "Remote status HEAD request returned code #{response.code}"
return nil if response.code != 200
if response.mime_type == 'application/atom+xml'
return process_atom(url, fetch(url))
elsif !response['Link'].blank?
return process_headers(response)
else
return process_html(fetch(url))
end
end
private
def process_atom(url, body)
Rails.logger.debug "Processing Atom for remote status"
xml = Nokogiri::XML(body)
account = extract_author(url, xml)
return nil if account.nil?
statuses = ProcessFeedService.new.(body, account)
return statuses.first
end
def process_html(body)
Rails.logger.debug "Processing HTML for remote status"
page = Nokogiri::HTML(body)
alternate_link = page.xpath('//link[@rel="alternate"]').find { |link| link['type'] == 'application/atom+xml' }
return nil if alternate_link.nil?
return process_atom(alternate_link['href'], fetch(alternate_link['href']))
end
def process_headers(response)
Rails.logger.debug "Processing link header for remote status"
link_header = LinkHeader.parse(response['Link'])
alternate_link = link_header.find_link(['rel', 'alternate'], ['type', 'application/atom+xml'])
return nil if alternate_link.nil?
return process_atom(alternate_link.href, fetch(alternate_link.href))
end
def extract_author(url, xml)
url_parts = Addressable::URI.parse(url)
username = xml.at_xpath('//xmlns:author/xmlns:name').try(:content)
domain = url_parts.host
return nil if username.nil?
Rails.logger.debug "Going to webfinger #{username}@#{domain}"
return FollowRemoteAccountService.new.("#{username}@#{domain}")
end
def fetch(url)
http_client.get(url).to_s
end
def http_client
HTTP.timeout(:per_operation, write: 20, connect: 20, read: 50)
end
end
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