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require "aws-sdk"
require "active_support/core_ext/numeric/bytes"
class ActiveStorage::Service::S3Service < ActiveStorage::Service
attr_reader :client, :bucket
def initialize(access_key_id:, secret_access_key:, region:, bucket:)
@client = Aws::S3::Resource.new(access_key_id: access_key_id, secret_access_key: secret_access_key, region: region)
@bucket = @client.bucket(bucket)
end
def upload(key, io, checksum: nil)
object_for(key).put(body: io, content_md5: checksum)
rescue Aws::S3::Errors::BadDigest
raise ActiveStorage::IntegrityError
end
def download(key)
if block_given?
stream(key, &block)
else
object_for(key).get.body.read
end
end
def delete(key)
object_for(key).delete
end
def exist?(key)
object_for(key).exists?
end
def url(key, expires_in:, disposition:, filename:)
object_for(key).presigned_url :get, expires_in: expires_in,
response_content_disposition: "#{disposition}; filename=\"#{filename}\""
end
private
def object_for(key)
bucket.object(key)
end
# Reads the object for the given key in chunks, yielding each to the block.
def stream(key, options = {}, &block)
object = object_for(key)
chunk_size = 5.megabytes
offset = 0
while offset < object.content_length
yield object.read(options.merge(range: "bytes=#{offset}-#{offset + chunk_size - 1}"))
offset += chunk_size
end
end
end
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