19 行
729 B
Ruby
19 行
729 B
Ruby
class PostThumbnailUploadValidator
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MAX_THUMBNAIL_BYTES = 20 * 1024 * 1024
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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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raise InvalidUpload, 'thumbnail upload が不正です．' unless thumbnail.is_a?(ActionDispatch::Http::UploadedFile)
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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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attachment = Post.resized_thumbnail_attachment(thumbnail)
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attachment[:io].close if attachment[:io].respond_to?(:close)
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rescue MiniMagick::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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end
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