35 行
1.4 KiB
Ruby
35 行
1.4 KiB
Ruby
class PostThumbnailUploadValidator
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MAX_THUMBNAIL_BYTES = 20 * 1024 * 1024
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ALLOWED_CONTENT_TYPES = Preview::ThumbnailFetcher::RASTER_IMAGE_CONTENT_TYPES.freeze
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class InvalidUpload < StandardError; end
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def self.validate! thumbnail
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return if thumbnail.blank?
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unless thumbnail.is_a?(ActionDispatch::Http::UploadedFile)
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raise InvalidUpload, 'thumbnail upload が不正です．'
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end
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raise InvalidUpload, 'thumbnail file size が大きすぎます．' if thumbnail.size > MAX_THUMBNAIL_BYTES
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raise InvalidUpload, 'サムネイル画像の形式が不正です．' unless allowed_content_type?(thumbnail.content_type)
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bytes = thumbnail.read
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raise InvalidUpload, 'サムネイル画像の形式が不正です．' if Post.svg_document_bytes?(bytes)
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unless Post.raster_thumbnail_bytes?(bytes)
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raise InvalidUpload, 'サムネイル画像の形式が不正です．'
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end
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attachment = Post.resized_thumbnail_attachment(
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StringIO.new(bytes),
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content_type: thumbnail.content_type)
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attachment[:io].close if attachment[:io].respond_to?(:close)
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rescue MiniMagick::Error, Timeout::Error
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raise InvalidUpload, 'サムネイル画像の変換に失敗しました．'
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ensure
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thumbnail&.rewind if thumbnail.respond_to?(:rewind)
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end
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def self.allowed_content_type? content_type
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mime_type = content_type.to_s.split(';', 2).first.to_s.downcase.strip
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ALLOWED_CONTENT_TYPES.include?(mime_type)
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end
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end
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