dfdae481e4
* Trigger Build * Cache the HTML response for quicker previews * remove unnecessary comments
98 lines
2.3 KiB
Ruby
98 lines
2.3 KiB
Ruby
# This class provides methods for getting structured metadata properties for
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# Open Graph usage
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# @note A wrapper around the metainspector gem
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class OpenGraph
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delegate :meta, :meta_tags, :images, to: :page
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delegate :favicon, to: :images
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attr_reader :page, :tags
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DEFAULT_METHODS = %i[description title url].freeze
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CACHE_EXPIRY_IN_MINUTES = 15
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def initialize(url)
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html = fetch_html(url)
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@page = MetaInspector.new(url, document: html)
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@tags = meta_tags
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end
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# the optional "use_best" argument is used to determine if we should use the
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# "best" option availabile for said method this works by picking the most
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# available (first?) title, description, or author (respectively), if defined
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# with the og:* or twitter:* metatags. example page.title(true) would look in
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# said areas. the default only looks at the head or default metatag.
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DEFAULT_METHODS.each do |method_name|
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define_method(method_name) do |use_best = false|
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if use_best
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page.public_send("best_#{method_name}".to_sym)
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else
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page.public_send(method_name)
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end
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end
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end
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def meta_for(data)
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page.meta[data]
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end
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def image
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page.images.best
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end
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def properties
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return {} if tags["property"].blank?
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tags["property"]
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end
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def main_properties
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%w[og:title og:url]
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end
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def main_properties_present?
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(main_properties - properties.keys).empty?
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end
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def preferred_desc
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properties["og:description"].first || page.description
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end
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# this method groups like-properties, making it a little easier to determine
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# the high level properties available for use. All "fb", "og", etc properties
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# will be grouped by their respective key
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def grouped_properties
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return {} if properties.blank?
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group(properties)
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end
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def grouped_meta
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return {} if meta.blank?
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group(meta)
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end
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def twitter
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return {} unless grouped_meta.key?("twitter")
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grouped_meta["twitter"]
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end
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private
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def fetch_html(url)
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Rails.cache.fetch("#{url}_open_graph_html", expires_in: CACHE_EXPIRY_IN_MINUTES.minutes) do
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Net::HTTP.get(URI(url))
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end
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end
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def group(data)
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data.each_with_object({}) do |(key, value), hash|
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group_key = key.split(":").first
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hash[group_key] ||= {}
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hash[group_key][key] = value
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end
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end
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end
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