33 行
1006 B
Ruby
33 行
1006 B
Ruby
module Preview
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class KnownSiteExtractor
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def self.thumbnail_url(uri)
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youtube_thumbnail(uri) || niconico_thumbnail(uri)
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end
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def self.youtube_thumbnail(uri)
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id =
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case uri.host&.downcase
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when 'youtu.be'
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uri.path.split('/').reject(&:blank?).first
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when 'www.youtube.com', 'youtube.com', 'm.youtube.com'
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uri.path == '/watch' ? URI.decode_www_form(uri.query.to_s).to_h['v'] : nil
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end
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return unless id&.match?(/\A[A-Za-z0-9_-]{6,20}\z/)
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"https://i.ytimg.com/vi/#{ id }/hqdefault.jpg"
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end
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def self.niconico_thumbnail(uri)
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return unless ['www.nicovideo.jp', 'nicovideo.jp', 'nico.ms'].include?(uri.host&.downcase)
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id = uri.path[%r{/(?:watch/)?(sm\d+)\z}, 1]
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return unless id
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numeric_id = id.delete_prefix('sm')
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"https://nicovideo.cdn.nimg.jp/thumbnails/#{ numeric_id }/#{ numeric_id }.L"
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end
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private_class_method :youtube_thumbnail, :niconico_thumbnail
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end
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end
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