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require "active_support/core_ext/numeric/bytes"
require "azure/storage"
require "azure/storage/core/auth/shared_access_signature"
# Wraps the Microsoft Azure Storage Blob Service as a Active Storage service.
# See `ActiveStorage::Service` for the generic API documentation that applies to all services.
class ActiveStorage::Service::AzureService < ActiveStorage::Service
attr_reader :client, :path, :blobs, :container, :signer
def initialize(path:, storage_account_name:, storage_access_key:, container:)
@client = Azure::Storage::Client.create(storage_account_name: storage_account_name, storage_access_key: storage_access_key)
@signer = Azure::Storage::Core::Auth::SharedAccessSignature.new(storage_account_name, storage_access_key)
@blobs = client.blob_client
@container = container
@path = path
end
def upload(key, io, checksum: nil)
instrument :upload, key, checksum: checksum do
begin
blobs.create_block_blob(container, key, io, content_md5: checksum)
rescue Azure::Core::Http::HTTPError => e
raise ActiveStorage::IntegrityError
end
end
end
def download(key)
if block_given?
instrument :streaming_download, key do
stream(key, &block)
end
else
instrument :download, key do
_, io = blobs.get_blob(container, key)
io.force_encoding(Encoding::BINARY)
end
end
end
def delete(key)
instrument :delete, key do
begin
blobs.delete_blob(container, key)
rescue Azure::Core::Http::HTTPError
false
end
end
end
def exist?(key)
instrument :exist, key do |payload|
answer = blob_for(key).present?
payload[:exist] = answer
answer
end
end
def url(key, expires_in:, disposition:, filename:)
instrument :url, key do |payload|
base_url = url_for(key)
generated_url = signer.signed_uri(URI(base_url), false, permissions: "r",
expiry: format_expiry(expires_in), content_disposition: "#{disposition}; filename=\"#{filename}\"").to_s
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|
base_url = url_for(key)
generated_url = signer.signed_uri(URI(base_url), false, permissions: "rw",
expiry: format_expiry(expires_in)).to_s
payload[:url] = generated_url
generated_url
end
end
def headers_for_direct_upload(key, content_type:, checksum:, **)
{ "Content-Type" => content_type, "Content-MD5" => checksum, "x-ms-blob-type" => "BlockBlob" }
end
private
def url_for(key)
"#{path}/#{container}/#{key}"
end
def blob_for(key)
blobs.get_blob_properties(container, key)
rescue Azure::Core::Http::HTTPError
false
end
def format_expiry(expires_in)
expires_in ? Time.now.utc.advance(seconds: expires_in).iso8601 : nil
end
# Reads the object for the given key in chunks, yielding each to the block.
def stream(key, options = {}, &block)
blob = blob_for(key)
chunk_size = 5.megabytes
offset = 0
while offset < blob.properties[:content_length]
_, io = blobs.get_blob(container, key, start_range: offset, end_range: offset + chunk_size - 1)
yield io
offset += chunk_size
end
end
end
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