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50 lines
1.5 KiB
50 lines
1.5 KiB
# frozen_string_literal: true |
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class FetchAtomService < BaseService |
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def call(url) |
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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) unless response['Link'].blank? |
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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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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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def http_client |
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HTTP.timeout(:per_operation, write: 20, connect: 20, read: 50).follow |
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end |
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end
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