2017-02-22 19:25:06 +00:00
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class Upload < ActiveRecord::Base
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# Upper limit for foreground checksum processing
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CHECKSUM_THRESHOLD = 100.megabytes
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2017-06-02 12:29:30 +00:00
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belongs_to :model, polymorphic: true # rubocop:disable Cop/PolymorphicAssociations
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2017-02-22 19:25:06 +00:00
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validates :size, presence: true
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validates :path, presence: true
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validates :model, presence: true
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validates :uploader, presence: true
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2018-01-29 17:57:34 +00:00
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before_save :calculate_checksum!, if: :foreground_checksummable?
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after_commit :schedule_checksum, if: :checksummable?
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2017-02-22 19:25:06 +00:00
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2018-01-30 14:21:28 +00:00
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# as the FileUploader is not mounted, the default CarrierWave ActiveRecord
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# hooks are not executed and the file will not be deleted
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2018-01-31 15:59:35 +00:00
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after_destroy :delete_file!, if: -> { uploader_class <= FileUploader }
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2018-01-30 14:21:28 +00:00
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2018-01-29 17:57:34 +00:00
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def self.hexdigest(path)
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Digest::SHA256.file(path).hexdigest
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2017-02-22 19:25:06 +00:00
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end
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def absolute_path
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return path unless relative_path?
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uploader_class.absolute_path(self)
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end
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2018-01-29 17:57:34 +00:00
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def calculate_checksum!
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self.checksum = nil
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return unless checksummable?
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2017-02-22 19:25:06 +00:00
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2018-01-29 17:57:34 +00:00
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self.checksum = self.class.hexdigest(absolute_path)
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end
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def build_uploader
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2018-01-30 19:38:10 +00:00
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uploader_class.new(model, mount_point, **uploader_context).tap do |uploader|
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2018-01-29 17:57:34 +00:00
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uploader.upload = self
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uploader.retrieve_from_store!(identifier)
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end
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2017-02-22 19:25:06 +00:00
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end
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def exist?
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File.exist?(absolute_path)
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end
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2018-01-29 21:06:17 +00:00
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def uploader_context
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{
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identifier: identifier,
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secret: secret
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}.compact
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end
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2017-02-22 19:25:06 +00:00
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private
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2018-01-30 14:21:28 +00:00
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def delete_file!
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build_uploader.remove!
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end
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2018-01-29 17:57:34 +00:00
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def checksummable?
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checksum.nil? && local? && exist?
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end
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def local?
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2018-01-30 13:15:34 +00:00
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true
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2018-01-29 17:57:34 +00:00
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end
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def foreground_checksummable?
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checksummable? && size <= CHECKSUM_THRESHOLD
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2017-02-22 19:25:06 +00:00
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end
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def schedule_checksum
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UploadChecksumWorker.perform_async(id)
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end
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def relative_path?
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!path.start_with?('/')
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end
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2018-01-29 21:06:17 +00:00
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def uploader_class
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Object.const_get(uploader)
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end
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2018-01-29 17:57:34 +00:00
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def identifier
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File.basename(path)
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end
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2018-01-29 21:06:17 +00:00
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def mount_point
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super&.to_sym
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2017-02-22 19:25:06 +00:00
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end
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end
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