Arc Google Cloud Storage

Arc GCS Provides an Arc storage back-end for Google Cloud Storage.

Please note as Arc has not been updated or activly maintained we are now switching over to Waffle

Installation

Add the latest stable release to your mix.exs file:

defp deps do
  [
    {:arc_gcs, "~> 0.2"}
  ]
end

Then run mix deps.get in your shell to fetch the dependencies.

Configuration

config :arc,
  storage: Arc.Storage.GCS,
  bucket: "gcs-bucket-name"

config :goth,
  json: "/path/to/json" |> Path.expand |> File.read!

Custom Token Generation

By default, the credentials provided to Goth will be used to generate tokens. If you have multiple sets of credentials in Goth or otherwise need more control over token generation, you can define your own module:

defmodule MyCredentials do
  @behaviour Arc.Storage.GCS.TokenFetcher

  @impl Arc.Storage.GCS.TokenFetcher
  def get_token(scopes) when is_list(scopes), do: get_token(Enum.join(scopes, " "))

  @impl Arc.Storage.GCS.TokenFetcher
  def get_token(scope) when is_binary(scope) do
    {:ok, token} = Goth.Token.for_scope({"[email protected]", scope})
    token.token
  end
end

And configure it to use this new module instead of the default token generation:

config :arc,
  storage: Arc.Storage.GCS,
  bucket: "gcs-bucket-name",
  token_fetcher: MyCredentials

Tests

To run the tests you need to set the following

• ARC_TEST_BUCKET - e.g gcs-bucket-name
• GOOGLE_CREDENTIAL - your JSON credential from Google
• Finally mix test

Notes

Basic functionality from Arc including

1. Store with ACL
2. Delete
3. Generate URL and sign URL

License

Copyright 2017-2020 Martide Limited

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.