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disk_service.rb
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disk_service.rb
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# frozen_string_literal: true
require "fileutils"
require "pathname"
require "openssl"
require "active_support/core_ext/numeric/bytes"
module ActiveStorage
# = Active Storage \Disk \Service
#
# Wraps a local disk path as an Active Storage service. See ActiveStorage::Service for the generic API
# documentation that applies to all services.
class Service::DiskService < Service
attr_accessor :root
def initialize(root:, public: false, **options)
@root = root
@public = public
end
def upload(key, io, checksum: nil, **)
instrument :upload, key: key, checksum: checksum do
IO.copy_stream(io, make_path_for(key))
ensure_integrity_of(key, checksum) if checksum
end
end
def download(key, &block)
if block_given?
instrument :streaming_download, key: key do
stream key, &block
end
else
instrument :download, key: key do
File.binread path_for(key)
rescue Errno::ENOENT
raise ActiveStorage::FileNotFoundError
end
end
end
def download_chunk(key, range)
instrument :download_chunk, key: key, range: range do
File.open(path_for(key), "rb") do |file|
file.seek range.begin
file.read range.size
end
rescue Errno::ENOENT
raise ActiveStorage::FileNotFoundError
end
end
def delete(key)
instrument :delete, key: key do
File.delete path_for(key)
rescue Errno::ENOENT
# Ignore files already deleted
end
end
def delete_prefixed(prefix)
instrument :delete_prefixed, prefix: prefix do
Dir.glob(path_for("#{prefix}*")).each do |path|
FileUtils.rm_rf(path)
end
end
end
def exist?(key)
instrument :exist, key: key do |payload|
answer = File.exist? path_for(key)
payload[:exist] = answer
answer
end
end
def url_for_direct_upload(key, expires_in:, content_type:, content_length:, checksum:, custom_metadata: {})
instrument :url, key: key do |payload|
verified_token_with_expiration = ActiveStorage.verifier.generate(
{
key: key,
content_type: content_type,
content_length: content_length,
checksum: checksum,
service_name: name
},
expires_in: expires_in,
purpose: :blob_token
)
url_helpers.update_rails_disk_service_url(verified_token_with_expiration, url_options).tap do |generated_url|
payload[:url] = generated_url
end
end
end
def headers_for_direct_upload(key, content_type:, **)
{ "Content-Type" => content_type }
end
def path_for(key) # :nodoc:
File.join root, folder_for(key), key
end
def compose(source_keys, destination_key, **)
File.open(make_path_for(destination_key), "w") do |destination_file|
source_keys.each do |source_key|
File.open(path_for(source_key), "rb") do |source_file|
IO.copy_stream(source_file, destination_file)
end
end
end
end
private
def private_url(key, expires_in:, filename:, content_type:, disposition:, **)
generate_url(key, expires_in: expires_in, filename: filename, content_type: content_type, disposition: disposition)
end
def public_url(key, filename:, content_type: nil, disposition: :attachment, **)
generate_url(key, expires_in: nil, filename: filename, content_type: content_type, disposition: disposition)
end
def generate_url(key, expires_in:, filename:, content_type:, disposition:)
content_disposition = content_disposition_with(type: disposition, filename: filename)
verified_key_with_expiration = ActiveStorage.verifier.generate(
{
key: key,
disposition: content_disposition,
content_type: content_type,
service_name: name
},
expires_in: expires_in,
purpose: :blob_key
)
if url_options.blank?
raise ArgumentError, "Cannot generate URL for #{filename} using Disk service, please set ActiveStorage::Current.url_options."
end
url_helpers.rails_disk_service_url(verified_key_with_expiration, filename: filename, **url_options)
end
def stream(key)
File.open(path_for(key), "rb") do |file|
while data = file.read(5.megabytes)
yield data
end
end
rescue Errno::ENOENT
raise ActiveStorage::FileNotFoundError
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 OpenSSL::Digest::MD5.file(path_for(key)).base64digest == checksum
delete key
raise ActiveStorage::IntegrityError
end
end
def url_helpers
@url_helpers ||= Rails.application.routes.url_helpers
end
def url_options
ActiveStorage::Current.url_options
end
end
end