49 行
2.1 KiB
Ruby
49 行
2.1 KiB
Ruby
class PostMetadataFetcher
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def self.fetch raw_url
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uri, = Preview::UrlSafety.validate(raw_url)
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response = Preview::HttpFetcher.fetch(uri.to_s, max_bytes: Preview::ThumbnailFetcher::HTML_MAX_BYTES)
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metadata = Preview::HtmlMetadataExtractor.extract(response)
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document = Nokogiri::HTML.parse(response.body)
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content = -> name { document.at_css("meta[property='#{ name }'], meta[name='#{ name }']")&.[]('content')&.strip.presence }
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duration = content.call('og:video:duration') || content.call('video:duration')
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published = content.call('article:published_time') || content.call('date')
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created_range = original_created_range(published)
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platform_tags = platform_tags(uri)
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{ title: metadata[:title],
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thumbnail_base: Preview::KnownSiteExtractor.thumbnail_url(uri) || metadata[:image_url],
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original_created_from: created_range&.first&.iso8601,
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original_created_before: created_range&.last&.iso8601,
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duration: duration&.to_f&.then { _1.positive? ? (_1 * 1_000).round : nil },
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tags: platform_tags.join(' ') }
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end
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def self.platform_tags uri
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return ['動画', 'YouTube'] if Preview::KnownSiteExtractor.youtube_video_id(uri)
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return ['動画', 'ニコニコ'] if Preview::KnownSiteExtractor.niconico_video_id(uri)
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[]
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end
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def self.original_created_range value
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return nil if value.blank?
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raw = value.to_s.strip
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from = Time.zone.parse(raw)
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zone = '(?:Z|[+-]\d{2}:?\d{2})?'
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before = case raw
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when /\A\d{4}\z/ then from + 1.year
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when /\A\d{4}-\d{2}\z/ then from + 1.month
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when /\A\d{4}-\d{2}-\d{2}\z/ then from + 1.day
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when /\A\d{4}-\d{2}-\d{2}T\d{2}#{ zone }\z/ then from + 1.hour
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when /\A\d{4}-\d{2}-\d{2}T\d{2}:\d{2}#{ zone }\z/ then from + 1.minute
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when /\A\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}#{ zone }\z/ then from + 1.second
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when /\A\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d+#{ zone }\z/ then from + 0.001
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else return nil
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end
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[from, before]
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rescue ArgumentError, TypeError
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nil
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end
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private_class_method :platform_tags, :original_created_range
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end
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