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* SPEC: PollFeedJob parsing atom feed * add FeedItemAccessor It is to provide a consistent interface to access a feed item's tag content. * add FeedElementInstaller to install non-standard and non-namespaced feed elements * FEATURE: replace SimpleRSS with Ruby RSS module * get FinalDestination and download with Excon * support namespaced element with FeedElementInstaller
53 lines
1.8 KiB
Ruby
53 lines
1.8 KiB
Ruby
require 'rexml/document'
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require 'rss'
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class FeedElementInstaller
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private_class_method :new
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def self.install(element_name, feed)
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# RSS Specification at http://cyber.harvard.edu/rss/rss.html#extendingRss
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# > A RSS feed may contain [non-standard elements], only if those elements are *defined in a namespace*
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new(element_name, feed).install if element_name.include?(':')
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end
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attr_reader :feed, :original_name, :element_namespace, :element_name, :element_accessor
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def initialize(element_name, feed)
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@feed = feed
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@original_name = element_name
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@element_namespace, @element_name = *element_name.split(':')
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@element_accessor = "#{@element_namespace}_#{@element_name}"
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end
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def element_uri
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@element_uri ||= REXML::Document.new(feed).root&.attributes&.namespaces&.fetch(@element_namespace, '') || ''
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end
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def install
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install_in_rss unless installed_in_rss?
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install_in_atom unless installed_in_atom?
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end
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private
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def install_in_rss
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RSS::Rss::Channel::Item.install_text_element(element_name, element_uri, '?', element_accessor, nil, original_name)
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RSS::BaseListener.install_get_text_element(element_uri, element_name, element_accessor)
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end
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def install_in_atom
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RSS::Atom::Entry.install_text_element(element_name, element_uri, '?', element_accessor, nil, original_name)
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RSS::Atom::Feed::Entry.install_text_element(element_name, element_uri, '?', element_accessor, nil, original_name)
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RSS::BaseListener.install_get_text_element(element_uri, element_name, element_accessor)
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end
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def installed_in_rss?
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RSS::Rss::Channel::Item.method_defined?(element_accessor)
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end
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def installed_in_atom?
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RSS::Atom::Entry.method_defined?(element_accessor) || RSS::Atom::Feed::Entry.method_defined?(element_accessor)
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end
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end
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