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# frozen_string_literal: true
gem "azure-storage-blob", ">= 1.1"
require "active_support/core_ext/numeric/bytes"
require "azure/storage/blob"
require "azure/storage/common/core/auth/shared_access_signature"
module ActiveStorage
# Wraps the Microsoft Azure Storage Blob Service as an Active Storage service.
# See ActiveStorage::Service for the generic API documentation that applies to all services.
class Service::AzureStorageService < Service
attr_reader :client, :container, :signer
def initialize(storage_account_name:, storage_access_key:, container:, public: false, **options)
@client = Azure::Storage::Blob::BlobService.create(storage_account_name: storage_account_name, storage_access_key: storage_access_key, **options)
@signer = Azure::Storage::Common::Core::Auth::SharedAccessSignature.new(storage_account_name, storage_access_key)
@container = container
@public = public
end
def upload(key, io, checksum: nil, filename: nil, content_type: nil, disposition: nil, **)
instrument :upload, key: key, checksum: checksum do
handle_errors do
content_disposition = content_disposition_with(filename: filename, type: disposition) if disposition && filename
client.create_block_blob(container, key, IO.try_convert(io) || io, content_md5: checksum, content_type: content_type, content_disposition: content_disposition)
end
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
handle_errors do
_, io = client.get_blob(container, key)
io.force_encoding(Encoding::BINARY)
end
end
end
end
def download_chunk(key, range)
instrument :download_chunk, key: key, range: range do
handle_errors do
_, io = client.get_blob(container, key, start_range: range.begin, end_range: range.exclude_end? ? range.end - 1 : range.end)
io.force_encoding(Encoding::BINARY)
end
end
end
def delete(key)
instrument :delete, key: key do
client.delete_blob(container, key)
rescue Azure::Core::Http::HTTPError => e
raise unless e.type == "BlobNotFound"
# Ignore files already deleted
end
end
def delete_prefixed(prefix)
instrument :delete_prefixed, prefix: prefix do
marker = nil
loop do
results = client.list_blobs(container, prefix: prefix, marker: marker)
results.each do |blob|
client.delete_blob(container, blob.name)
end
break unless marker = results.continuation_token.presence
end
end
end
def exist?(key)
instrument :exist, key: key do |payload|
answer = blob_for(key).present?
payload[:exist] = answer
answer
end
end
def url_for_direct_upload(key, expires_in:, content_type:, content_length:, checksum:)
instrument :url, key: key do |payload|
generated_url = signer.signed_uri(
uri_for(key), false,
service: "b",
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:, filename: nil, disposition: nil, **)
content_disposition = content_disposition_with(type: disposition, filename: filename) if filename
{ "Content-Type" => content_type, "Content-MD5" => checksum, "x-ms-blob-content-disposition" => content_disposition, "x-ms-blob-type" => "BlockBlob" }
end
private
def private_url(key, expires_in:, filename:, disposition:, content_type:, **)
signer.signed_uri(
uri_for(key), false,
service: "b",
permissions: "r",
expiry: format_expiry(expires_in),
content_disposition: content_disposition_with(type: disposition, filename: filename),
content_type: content_type
).to_s
end
def public_url(key, **)
uri_for(key).to_s
end
def uri_for(key)
client.generate_uri("#{container}/#{key}")
end
def blob_for(key)
client.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)
blob = blob_for(key)
chunk_size = 5.megabytes
offset = 0
raise ActiveStorage::FileNotFoundError unless blob.present?
while offset < blob.properties[:content_length]
_, chunk = client.get_blob(container, key, start_range: offset, end_range: offset + chunk_size - 1)
yield chunk.force_encoding(Encoding::BINARY)
offset += chunk_size
end
end
def handle_errors
yield
rescue Azure::Core::Http::HTTPError => e
case e.type
when "BlobNotFound"
raise ActiveStorage::FileNotFoundError
when "Md5Mismatch"
raise ActiveStorage::IntegrityError
else
raise
end
end
end
end
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