92 lines
3.3 KiB
Ruby
92 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 = 16_777_216 # 4096x4096px or approx. 16MB
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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, MimeMagic 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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video/ogg
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video/webm
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).freeze
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included do
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before_post_process :obfuscate_file_name
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before_post_process :set_file_extensions
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before_post_process :check_image_dimensions
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before_post_process :set_file_content_type
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end
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private
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def set_file_content_type
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self.class.attachment_definitions.each_key do |attachment_name|
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attachment = send(attachment_name)
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next 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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end
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def set_file_extensions
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self.class.attachment_definitions.each_key do |attachment_name|
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attachment = send(attachment_name)
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next if attachment.blank?
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attachment.instance_write :file_name, [Paperclip::Interpolations.basename(attachment, :original), appropriate_extension(attachment)].delete_if(&:blank?).join('.')
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end
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end
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def check_image_dimensions
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self.class.attachment_definitions.each_key do |attachment_name|
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attachment = send(attachment_name)
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next 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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matrix_limit = attachment.content_type == 'image/gif' ? GIF_MATRIX_LIMIT : MAX_MATRIX_LIMIT
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raise Mastodon::DimensionsValidationError, "#{width}x#{height} images are not supported" if width.present? && height.present? && (width * height > matrix_limit)
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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
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self.class.attachment_definitions.each_key do |attachment_name|
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attachment = send(attachment_name)
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next 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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end
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