GcloudStorage

Simple Google Cloud Storage file upload gem for Ruby. This is an alternative gem for carrierwave with fog. As, carrierwave with fog only uses API Key authentication to talk to Google Cloud Storage API. This gem supports the service account authentication and as well as compute instance service account where you don't have to initialize the gem with the credentials.

Add this line to your application's Gemfile:

gem 'gcloud_storage', '0.0.4'

If you're using rails 5.0 and above then

gem 'gcloud_storage', '0.0.5'

And then execute:

$ bundle

Or install it yourself as:

$ gem install gcloud_storage

Model:

class TempFile < ActiveRecord::Base
  include GcloudStorage::Uploader

  # attribute :file
  mount_gcloud_uploader :file #[, presence: true] #=> Run's presence validation
end

Migration:

class CreateTempFiles < ActiveRecord::Migration
  def change
    create_table :temp_files do |t|
      t.string :file

      t.timestamps null: false
    end
  end
end

Attachment Methods:

temp_file = TempFile.new(file_uploader_object: path_to_file) # => TempFile object
temp_file.file_exists? # => false
temp_file.save
temp_file.file_exists? # => true
temp_file.file_url # => HTTPS URL which expires in 300 seconds bye default
temp_file.file_expirable_url(60) # => HTTPS URL which expires in 60 seconds
temp_file.file_path # => "/uploads/#{model_name}s/:id/#{attribute_name}s/filename.extension"

Create an initializer file config/initializers/gcloud_storage.rb and add these lines:

For remote storage:

# Uncomment this to support large file uploads
# Faraday.default_adapter = :httpclient

GcloudStorage.configure do |config|
  config.credentials = {
    bucket_name: 'bucket_name', # Storage bucket name
    project_id: 'project_id',   # Google Cloud Project ID
    key_file: 'key_file_path'   # Compute Service account json file
  }
end

# Add this to validate and cache connection object
# while loading the Rails Application
# GcloudStorage.initialize_service!

For local storage:

GcloudStorage.configure do |config|
  config.credentials = {
    storage: :local_store
  }
end

# Add this to validate and cache connection object
# while loading the Rails Application
# GcloudStorage.initialize_service!

File upload example: You can pass path to the file to be uploaded as a String or as Pathname or as Rack::Multipart::UploadedFile object using HTML Multipart form. The attribute to initialize will be #{column}_uploader_object. Here the column name is file in the above example.

$ rails console
Loading development environment (Rails 4.2.0)
 :001 > `echo "This is a test file" > temp.txt`
 => ""
 :002 > file = Rack::Multipart::UploadedFile.new("temp.txt")
 => #<Rack::Multipart::UploadedFile:0x007f9e29ae37c8 @content_type="text/plain", @original_filename="temp.txt", @tempfile=#<Tempfile:/var/folders/temp.txt>>
 :003 > temp_file = TempFile.new(file_uploader_object: file) # file_attribute => #{column}_uploader_object
 => #<TempFile id: nil, file: "temp.txt", created_at: nil, updated_at: nil>
 :004 > temp_file.valid?
 => true
 :005 > temp_file.save
 => true
 :006 > temp_file.file_url
 => "https://storage.googleapis.com/<bucket-name>/uploads/temp_files/1/files/temp.txt?GoogleAccessId=compute%40developer.gserviceaccount.com&Expires=1459851006&Signature=XXXX"
 :007 > `echo "Yet Another test file" > tmp/yet_another_test.txt`
 => ""
 :008 > another_file = TempFile.new(file_uploader_object: "tmp/yet_another_test.txt")
 => #<TempFile id: nil, file: "yet_another_test.txt", created_at: nil, updated_at: nil>
 :009 > another_file.save
 => true
 :010 > another_file.file_url
 => "https://storage.googleapis.com/<bucket-name>/uploads/temp_files/2/files/yet_another_test.txt?GoogleAccessId=compute%40developer.gserviceaccount.com&Expires=1459851800&Signature=XXXX"
 :011 > open(another_file.file_url).read
 => "Yet Another test file\n"
 :012 > another_file.file_path
 => "uploads/temp_files/2/files/yet_another_test.txt"

1. More specs for GcloudStorage::Uploader
2. Support overriding the mountable methods in a better way. For now the user can override the methods in the model.

After checking out the repo, run bin/setup to install dependencies. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To run specs locally you need to setup a service account on google cloud project and add the service json file to the root directory as test-bucket-service.json and create config.yml from config.yml.example and fill in the appropriate values.

Bug reports and pull requests are welcome on GitHub at https://github.com/itsprdp/gcloud_storage. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.