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class Upload < ActiveRecord::Base
# Upper limit for foreground checksum processing
CHECKSUM_THRESHOLD = 100.megabytes
belongs_to :model, polymorphic: true
validates :size, presence: true
validates :path, presence: true
validates :model, presence: true
validates :uploader, presence: true
before_save :calculate_checksum, if: :foreground_checksum?
after_commit :schedule_checksum, unless: :foreground_checksum?
def self.remove_path(path)
where(path: path).destroy_all
end
def self.record(uploader)
remove_path(uploader.relative_path)
create(
size: uploader.file.size,
path: uploader.relative_path,
model: uploader.model,
uploader: uploader.class.to_s
)
end
def absolute_path
return path unless relative_path?
uploader_class.absolute_path(self)
end
def calculate_checksum
return unless exist?
self.checksum = Digest::SHA256.file(absolute_path).hexdigest
end
def exist?
File.exist?(absolute_path)
end
private
def foreground_checksum?
size <= CHECKSUM_THRESHOLD
end
def schedule_checksum
UploadChecksumWorker.perform_async(id)
end
def relative_path?
!path.start_with?('/')
end
def uploader_class
Object.const_get(uploader)
end
end
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