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require "fileutils"
require "pathname"
require "digest/md5"
require "active_support/core_ext/numeric/bytes"
# Wraps a local disk path as a Active Storage service. See `ActiveStorage::Service` for the generic API
# documentation that applies to all services.
class ActiveStorage::Service::DiskService < ActiveStorage::Service
attr_reader :root
def initialize(root:)
@root = root
end
def upload(key, io, checksum: nil)
instrument :upload, key, checksum: checksum do
IO.copy_stream(io, make_path_for(key))
ensure_integrity_of(key, checksum) if checksum
end
end
def download(key)
if block_given?
instrument :streaming_download, key do
File.open(path_for(key), "rb") do |file|
while data = file.read(64.kilobytes)
yield data
end
end
end
else
instrument :download, key do
File.binread path_for(key)
end
end
end
def delete(key)
instrument :delete, key do
begin
File.delete path_for(key)
rescue Errno::ENOENT
# Ignore files already deleted
end
end
end
def exist?(key)
instrument :exist, key do |payload|
answer = File.exist? path_for(key)
payload[:exist] = answer
answer
end
end
def url(key, expires_in:, disposition:, filename:, content_type:)
instrument :url, key do |payload|
verified_key_with_expiration = ActiveStorage.verifier.generate(key, expires_in: expires_in, purpose: :blob_key)
generated_url =
if defined?(Rails.application)
Rails.application.routes.url_helpers.rails_disk_blob_path \
verified_key_with_expiration,
disposition: disposition, filename: filename, content_type: content_type
else
"/rails/active_storage/disk/#{verified_key_with_expiration}/#{filename}?disposition=#{disposition}&content_type=#{content_type}"
end
payload[:url] = generated_url
generated_url
end
end
def url_for_direct_upload(key, expires_in:, content_type:, content_length:, checksum:)
instrument :url, key do |payload|
verified_token_with_expiration = ActiveStorage.verifier.generate(
{
key: key,
content_type: content_type,
content_length: content_length,
checksum: checksum
},
expires_in: expires_in,
purpose: :blob_token
)
generated_url =
if defined?(Rails.application)
Rails.application.routes.url_helpers.update_rails_disk_blob_path verified_token_with_expiration
else
"/rails/active_storage/disk/#{verified_token_with_expiration}"
end
payload[:url] = generated_url
generated_url
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
delete key
raise ActiveStorage::IntegrityError
end
end
end
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