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require "google/cloud/storage"
require "active_support/core_ext/object/to_query"
# Wraps the Google Cloud Storage as a Active Storage service. See `ActiveStorage::Service` for the generic API
# documentation that applies to all services.
class ActiveStorage::Service::GCSService < ActiveStorage::Service
attr_reader :client, :bucket
def initialize(project:, keyfile:, bucket:)
@client = Google::Cloud::Storage.new(project: project, keyfile: keyfile)
@bucket = @client.bucket(bucket)
end
def upload(key, io, checksum: nil)
instrument :upload, key, checksum: checksum do
begin
bucket.create_file(io, key, md5: checksum)
rescue Google::Cloud::InvalidArgumentError
raise ActiveStorage::IntegrityError
end
end
end
# FIXME: Add streaming when given a block
def download(key)
instrument :download, key do
io = file_for(key).download
io.rewind
io.read
end
end
def delete(key)
instrument :delete, key do
file_for(key).try(:delete)
end
end
def exist?(key)
instrument :exist, key do |payload|
answer = file_for(key).present?
payload[:exist] = answer
answer
end
end
def url(key, expires_in:, disposition:, filename:, content_type:)
instrument :url, key do |payload|
generated_url = file_for(key).signed_url expires: expires_in, query: {
"response-content-disposition" => "#{disposition}; filename=\"#{filename}\"",
"response-content-type" => content_type
}
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|
generated_url = bucket.signed_url key, method: "PUT", expires: expires_in,
content_type: content_type, content_md5: checksum
payload[:url] = generated_url
generated_url
end
end
def headers_for_direct_upload(key, content_type:, checksum:, **)
{ "Content-Type" => content_type, "Content-MD5" => checksum }
end
private
def file_for(key)
bucket.file(key)
end
end
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