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require "active_storage/service"
require "active_storage/filename"
require "active_storage/purge_job"
require "active_storage/variant"
require "active_storage/variation"
# Schema: id, key, filename, content_type, metadata, byte_size, checksum, created_at
class ActiveStorage::Blob < ActiveRecord::Base
self.table_name = "active_storage_blobs"
has_secure_token :key
store :metadata, coder: JSON
class_attribute :service
class << self
def find_signed(id)
find ActiveStorage.verifier.verify(id, purpose: :blob_id)
end
def build_after_upload(io:, filename:, content_type: nil, metadata: nil)
new.tap do |blob|
blob.filename = filename
blob.content_type = content_type
blob.metadata = metadata
blob.upload io
end
end
def create_after_upload!(io:, filename:, content_type: nil, metadata: nil)
build_after_upload(io: io, filename: filename, content_type: content_type, metadata: metadata).tap(&:save!)
end
def create_before_direct_upload!(filename:, byte_size:, checksum:, content_type: nil, metadata: nil)
create! filename: filename, byte_size: byte_size, checksum: checksum, content_type: content_type, metadata: metadata
end
end
def signed_id
ActiveStorage.verifier.generate(id, purpose: :blob_id)
end
def key
# We can't wait until the record is first saved to have a key for it
self[:key] ||= self.class.generate_unique_secure_token
end
def filename
ActiveStorage::Filename.new(self[:filename])
end
def variant(transformations)
ActiveStorage::Variant.new(self, ActiveStorage::Variation.new(transformations))
end
def url(expires_in: 5.minutes, disposition: :inline)
service.url key, expires_in: expires_in, disposition: disposition, filename: filename
end
def url_for_direct_upload(expires_in: 5.minutes)
service.url_for_direct_upload key, expires_in: expires_in, content_type: content_type, content_length: byte_size
end
def upload(io)
self.checksum = compute_checksum_in_chunks(io)
self.byte_size = io.size
service.upload(key, io, checksum: checksum)
end
def download(&block)
service.download key, &block
end
def delete
service.delete key
end
def purge
delete
destroy
end
def purge_later
ActiveStorage::PurgeJob.perform_later(self)
end
private
def compute_checksum_in_chunks(io)
Digest::MD5.new.tap do |checksum|
while chunk = io.read(5.megabytes)
checksum << chunk
end
io.rewind
end.base64digest
end
end
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