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Goth

Google + Auth = Goth

A simple library to generate and retrieve OAuth2 tokens for use with Google Cloud Service accounts.

Installation

Note: below are instructions for using Goth v1.3+. For more information on earlier versions of Goth, see v1.2.0 documentation on hexdocs.pm.

  1. Add :goth to your list of dependencies in mix.exs. To use the built-in, Hackney-based HTTP client adapter, add :hackney too: 

    def deps do
  [
    {:goth, "~> 1.3-rc"},
    {:hackney, "~> 1.17"}
  ]
end

  2. Add Goth to your supervision tree: 

    defmodule MyApp.Application do
  use Application

  def start(_type, _args) do
    credentials = "GOOGLE_APPLICATION_CREDENTIALS_JSON" |> System.fetch_env!() |> Jason.decode!()
    source = {:service_account, credentials, []}

    children = [
      {Goth, name: MyApp.Goth, source: source}
    ]

    Supervisor.start_link(children, strategy: :one_for_one)
  end
end

2.1. ...or use multiple credentials

   defmodule MyApp.Application do
     use Application

     def start(_type, _args) do
       Supervisor.start_link(load_credentials(), strategy: :one_for_one)
     end

     defp load_credentials do
       [
         {MyApp.Cred1, "CREDENTIALS_JSON_1"},
         ...
         {MyApp.CredN, "CREDENTIALS_JSON_N"}
       ]
       |> Enum.map(fn {id, env_var} ->
         credentials = env_var |> System.fetch_env!() |> Jason.decode!()
         source = {:service_account, credentials, []}
         Supervisor.child_spec({Goth, name: id, source: source}, id: id)
       end)
   end

  1. Fetch the token: 

     iex> Goth.fetch!(MyApp.Goth)
 %Goth.Token{
   expires: 1453356568,
   token: "ya29.cALlJ4ICWRvMkYB-WsAR-CZnExE459PA7QPqKg5nei9y2T9-iqmbcgxq8XrTATNn_BPim",
   type: "Bearer",
   ...
 }

See Goth.start_link/1 for more information about possible configuration options.

Upgrading from Goth 1.2

See Upgrading from Goth 1.2 guide for more information.

Community resources