89 lines
3.3 KiB
Ruby
89 lines
3.3 KiB
Ruby
# frozen_string_literal: true
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require 'mime/types/columnar'
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module Attachmentable
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extend ActiveSupport::Concern
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MAX_MATRIX_LIMIT = 33_177_600 # 7680x4320px or approx. 847MB in RAM
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GIF_MATRIX_LIMIT = 921_600 # 1280x720px
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# For some file extensions, there exist different content
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# type variants, and browsers often send the wrong one,
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# for example, sending an audio .ogg file as video/ogg,
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# likewise, kt-paperclip also misreports them as such. For
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# those files, it is necessary to use the output of the
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# `file` utility instead
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INCORRECT_CONTENT_TYPES = %w(
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audio/vorbis
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audio/opus
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video/ogg
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video/webm
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).freeze
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included do
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def self.has_attached_file(name, options = {}) # rubocop:disable Naming/PredicateName
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super
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send(:"before_#{name}_validate", prepend: true) do
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attachment = send(name)
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check_image_dimension(attachment)
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set_file_content_type(attachment)
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obfuscate_file_name(attachment)
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set_file_extension(attachment)
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end
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end
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end
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private
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def set_file_content_type(attachment) # rubocop:disable Naming/AccessorMethodName
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return if attachment.blank? || attachment.queued_for_write[:original].blank? || !INCORRECT_CONTENT_TYPES.include?(attachment.instance_read(:content_type))
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attachment.instance_write :content_type, calculated_content_type(attachment)
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end
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def set_file_extension(attachment) # rubocop:disable Naming/AccessorMethodName
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return if attachment.blank?
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attachment.instance_write :file_name, [Paperclip::Interpolations.basename(attachment, :original), appropriate_extension(attachment)].compact_blank!.join('.')
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end
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def check_image_dimension(attachment)
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return if attachment.blank? || !/image.*/.match?(attachment.content_type) || attachment.queued_for_write[:original].blank?
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width, height = FastImage.size(attachment.queued_for_write[:original].path)
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return unless width.present? && height.present?
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if attachment.content_type == 'image/gif' && width * height > GIF_MATRIX_LIMIT
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raise Mastodon::DimensionsValidationError, "#{width}x#{height} GIF files are not supported"
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elsif width * height > MAX_MATRIX_LIMIT
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raise Mastodon::DimensionsValidationError, "#{width}x#{height} images are not supported"
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end
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end
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def appropriate_extension(attachment)
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mime_type = MIME::Types[attachment.content_type]
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extensions_for_mime_type = mime_type.empty? ? [] : mime_type.first.extensions
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original_extension = Paperclip::Interpolations.extension(attachment, :original)
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proper_extension = extensions_for_mime_type.first.to_s
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extension = extensions_for_mime_type.include?(original_extension) ? original_extension : proper_extension
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extension = 'jpeg' if extension == 'jpe'
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extension
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end
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def calculated_content_type(attachment)
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Paperclip.run('file', '-b --mime :file', file: attachment.queued_for_write[:original].path).split(/[:;\s]+/).first.chomp
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rescue Terrapin::CommandLineError
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''
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end
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def obfuscate_file_name(attachment)
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return if attachment.blank? || attachment.queued_for_write[:original].blank? || attachment.options[:preserve_files]
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attachment.instance_write :file_name, SecureRandom.hex(8) + File.extname(attachment.instance_read(:file_name))
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end
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end
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