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54 lines
1.6 KiB
Ruby
54 lines
1.6 KiB
Ruby
# frozen_string_literal: true
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class FetchAtomService < BaseService
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include HttpHelper
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def call(url)
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return if url.blank?
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response = http_client.head(url)
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Rails.logger.debug "Remote status HEAD request returned code #{response.code}"
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response = http_client.get(url) if response.code == 405
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Rails.logger.debug "Remote status GET request returned code #{response.code}"
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return nil if response.code != 200
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return [url, fetch(url)] if response.mime_type == 'application/atom+xml'
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return process_headers(url, response) if response['Link'].present?
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process_html(fetch(url))
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rescue OpenSSL::SSL::SSLError => e
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Rails.logger.debug "SSL error: #{e}"
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nil
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rescue HTTP::ConnectionError => e
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Rails.logger.debug "HTTP ConnectionError: #{e}"
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nil
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end
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private
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def process_html(body)
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Rails.logger.debug 'Processing HTML'
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page = Nokogiri::HTML(body)
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alternate_link = page.xpath('//link[@rel="alternate"]').find { |link| link['type'] == 'application/atom+xml' }
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return nil if alternate_link.nil?
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[alternate_link['href'], fetch(alternate_link['href'])]
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end
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def process_headers(url, response)
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Rails.logger.debug 'Processing link header'
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link_header = LinkHeader.parse(response['Link'].is_a?(Array) ? response['Link'].first : response['Link'])
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alternate_link = link_header.find_link(%w(rel alternate), %w(type application/atom+xml))
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return process_html(fetch(url)) if alternate_link.nil?
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[alternate_link.href, fetch(alternate_link.href)]
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end
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def fetch(url)
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http_client.get(url).to_s
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end
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end
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