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Programming language: Elixir
License: MIT License
Tags: Authentication    
Latest version: v0.9.0

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README

Überauth Google Hex Version

Google OAuth2 strategy for Überauth.

Installation

  1. Setup your application at Google Developer Console.

  2. Add :ueberauth_google to your list of dependencies in mix.exs:

    def deps do
  [{:ueberauth_google, "~> 0.9"}]
end

  3. Add the strategy to your applications:

    def application do
  [applications: [:ueberauth_google]]
end

  4. Add Google to your Überauth configuration:

    config :ueberauth, Ueberauth,
  providers: [
    google: {Ueberauth.Strategy.Google, []}
  ]

  5. Update your provider configuration:

    Use that if you want to read client ID/secret from the environment variables in the compile time:

    config :ueberauth, Ueberauth.Strategy.Google.OAuth,
  client_id: System.get_env("GOOGLE_CLIENT_ID"),
  client_secret: System.get_env("GOOGLE_CLIENT_SECRET")

    Use that if you want to read client ID/secret from the environment variables in the run time:

    config :ueberauth, Ueberauth.Strategy.Google.OAuth,
  client_id: {System, :get_env, ["GOOGLE_CLIENT_ID"]},
  client_secret: {System, :get_env, ["GOOGLE_CLIENT_SECRET"]}

  6. Include the Überauth plug in your controller:

    defmodule MyApp.AuthController do
  use MyApp.Web, :controller
  plug Ueberauth
  ...
end

  7. Create the request and callback routes if you haven't already:

    scope "/auth", MyApp do
  pipe_through :browser

  get "/:provider", AuthController, :request
  get "/:provider/callback", AuthController, :callback
end

  8. Your controller needs to implement callbacks to deal with Ueberauth.Auth and Ueberauth.Failure responses.

For an example implementation see the Überauth Example application.

Calling

Depending on the configured url you can initiate the request through:

/auth/google

Or with options:

/auth/google?scope=email%20profile

By default the requested scope is "email". Scope can be configured either explicitly as a scope query value on the request path or in your configuration:

config :ueberauth, Ueberauth,
  providers: [
    google: {Ueberauth.Strategy.Google, [default_scope: "email profile plus.me"]}
  ]

You can also pass options such as the hd parameter to suggest a particular Google Apps hosted domain (caution, can still be overridden by the user), or prompt and access_type options to request refresh_tokens and offline access.

config :ueberauth, Ueberauth,
  providers: [
    google: {Ueberauth.Strategy.Google, [hd: "example.com", prompt: "select_account", access_type: "offline"]}
  ]

In some cases, it may be necessary to update the user info endpoint, such as when deploying to countries that block access to the default endpoint.

config :ueberauth, Ueberauth,
  providers: [
    google: {Ueberauth.Strategy.Google, [userinfo_endpoint: "https://www.googleapis.cn/oauth2/v3/userinfo"]}
  ]

This may also be set via runtime configuration by passing a 2 or 3 argument tuple. To use this feature, the first argument must be the atom :system, and the second argument must represent the environment variable containing the endpoint url. A third argument may be passed representing a default value if the environment variable is not found, otherwise the library default will be used. 

config :ueberauth, Ueberauth,
  providers: [
    google: {Ueberauth.Strategy.Google, [
      userinfo_endpoint: {:system, "GOOGLE_USERINFO_ENDPOINT", "https://www.googleapis.cn/oauth2/v3/userinfo"}
    ]}
  ]

To guard against client-side request modification, it's important to still check the domain in info.urls[:website] within the Ueberauth.Auth struct if you want to limit sign-in to a specific domain.

License

Please see LICENSE for licensing details.


*Note that all licence references and agreements mentioned in the ueberauth_google README section above are relevant to that project's source code only.