113 lines
3 KiB
Ruby
113 lines
3 KiB
Ruby
# frozen_string_literal: true
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class FetchOEmbedService
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ENDPOINT_CACHE_EXPIRES_IN = 24.hours.freeze
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URL_REGEX = %r{(=(https?(%3A|:)(//|%2F%2F)))([^&]*)}i
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attr_reader :url, :options, :format, :endpoint_url
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def call(url, options = {})
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@url = url
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@options = options
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if @options[:cached_endpoint]
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parse_cached_endpoint!
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else
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discover_endpoint!
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end
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fetch!
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end
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private
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def discover_endpoint!
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return if html.nil?
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@format = @options[:format]
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page = Nokogiri::HTML5(html)
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if @format.nil? || @format == :json
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@endpoint_url ||= page.at_xpath('//link[@type="application/json+oembed"]|//link[@type="text/json+oembed"]')&.attribute('href')&.value
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@format ||= :json if @endpoint_url
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end
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if @format.nil? || @format == :xml
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@endpoint_url ||= page.at_xpath('//link[@type="text/xml+oembed"]')&.attribute('href')&.value
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@format ||= :xml if @endpoint_url
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end
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return if @endpoint_url.blank?
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@endpoint_url = begin
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base_url = Addressable::URI.parse(@url)
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# If the OEmbed endpoint is given as http but the URL we opened
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# was served over https, we can assume OEmbed will be available
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# through https as well
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(base_url + @endpoint_url).tap do |absolute_url|
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absolute_url.scheme = base_url.scheme if base_url.scheme == 'https'
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end.to_s
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end
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cache_endpoint!
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rescue Addressable::URI::InvalidURIError
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@endpoint_url = nil
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end
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def parse_cached_endpoint!
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cached = @options[:cached_endpoint]
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return if cached[:endpoint].nil? || cached[:format].nil?
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@endpoint_url = Addressable::Template.new(cached[:endpoint]).expand(url: @url).to_s
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@format = cached[:format]
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end
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def cache_endpoint!
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return unless URL_REGEX.match?(@endpoint_url)
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url_domain = Addressable::URI.parse(@url).normalized_host
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endpoint_hash = {
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endpoint: @endpoint_url.gsub(URL_REGEX, '={url}'),
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format: @format,
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}
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Rails.cache.write("oembed_endpoint:#{url_domain}", endpoint_hash, expires_in: ENDPOINT_CACHE_EXPIRES_IN)
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end
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def fetch!
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return if @endpoint_url.blank?
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body = Request.new(:get, @endpoint_url).perform do |res|
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res.code == 200 ? res.body_with_limit : nil
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end
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validate(parse_for_format(body)) if body.present?
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rescue Oj::ParseError, Ox::ParseError
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nil
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end
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def parse_for_format(body)
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case @format
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when :json
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Oj.load(body, mode: :strict)&.with_indifferent_access
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when :xml
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Ox.load(body, mode: :hash_no_attrs)&.with_indifferent_access&.dig(:oembed)
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end
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end
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def validate(oembed)
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oembed if oembed.present? && oembed[:version].to_s == '1.0' && oembed[:type].present?
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end
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def html
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return @html if defined?(@html)
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@html = @options[:html] || Request.new(:get, @url).add_headers('Accept' => 'text/html').perform do |res|
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res.code != 200 || res.mime_type != 'text/html' ? nil : res.body_with_limit
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end
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end
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end
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