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require "fileutils"
require "pathname"
require "active_support/core_ext/numeric/bytes"
class ActiveStorage::Service::DiskService < ActiveStorage::Service
attr_reader :root
def initialize(root:)
@root = root
end
def upload(key, io, checksum: nil)
File.open(make_path_for(key), "wb") do |file|
while chunk = io.read(64.kilobytes)
file.write(chunk)
end
end
ensure_integrity_of(key, checksum) if checksum
end
def download(key)
if block_given?
File.open(path_for(key)) do |file|
while data = file.read(64.kilobytes)
yield data
end
end
else
File.open path_for(key), &:read
end
end
def delete(key)
File.delete path_for(key) rescue Errno::ENOENT # Ignore files already deleted
end
def exist?(key)
File.exist? path_for(key)
end
def url(key, expires_in:, disposition:, filename:)
verified_key_with_expiration = ActiveStorage::VerifiedKeyWithExpiration.encode(key, expires_in: expires_in)
if defined?(Rails) && defined?(Rails.application)
Rails.application.routes.url_helpers.rails_disk_blob_path(verified_key_with_expiration, disposition: disposition)
else
"/rails/blobs/#{verified_key_with_expiration}?disposition=#{disposition}"
end
end
private
def path_for(key)
File.join root, folder_for(key), key
end
def folder_for(key)
[ key[0..1], key[2..3] ].join("/")
end
def make_path_for(key)
path_for(key).tap { |path| FileUtils.mkdir_p File.dirname(path) }
end
def ensure_integrity_of(key, checksum)
unless Digest::MD5.file(path_for(key)).base64digest == checksum
raise ActiveStorage::IntegrityError
end
end
end
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