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https://github.com/ueberauth/ueberauth_Facebook

Facebook OAuth2 Strategy for Überauth.
https://github.com/ueberauth/ueberauth_Facebook

facebook oauth oauth2 strategy ueberauth ueberauth-strategies

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Facebook OAuth2 Strategy for Überauth.

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# Überauth Facebook

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> Facebook OAuth2 strategy for Überauth.

## Installation

1. Setup your application at [Facebook Developers](https://developers.facebook.com).

1. Add `:ueberauth_facebook` to your list of dependencies in `mix.exs`:

```elixir
def deps do
[
{:ueberauth_facebook, "~> 0.8"}
]
end
```

1. Add the strategy to your applications:

```elixir
def application do
[
applications: [:ueberauth_facebook]
]
end
```

1. Add Facebook to your Überauth configuration:

```elixir
config :ueberauth, Ueberauth,
providers: [
facebook: {Ueberauth.Strategy.Facebook, []}
]
```

1. Update your provider configuration:

```elixir
config :ueberauth, Ueberauth.Strategy.Facebook.OAuth,
client_id: System.get_env("FACEBOOK_CLIENT_ID"),
client_secret: System.get_env("FACEBOOK_CLIENT_SECRET")
```

1. Include the Überauth plug in your controller:

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

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

```elixir
scope "/auth", MyApp do
pipe_through :browser

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

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

For an example implementation see the [Überauth Example](https://github.com/ueberauth/ueberauth_example) application.

## Calling

Depending on the configured URL you can initialize the request through:

/auth/facebook

Or with options (`auth_type`, `scope`, `locale`, `display`):

/auth/facebook?scope=email,public_profile

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

```elixir
config :ueberauth, Ueberauth,
providers: [
facebook: {Ueberauth.Strategy.Facebook, [default_scope: "email,public_profile,user_friends"]}
]
```

Additionally you can now specify the `display` param to pass to Facebook:

```elixir
config :ueberauth, Ueberauth,
providers: [
facebook: {Ueberauth.Strategy.Facebook, [
default_scope: "email,public_profile,user_friends",
display: "popup"
]}
]
```

`display` can be the following values: `page` (default), `async`, `iframe`, `popup`, `touch`, `wap`

Starting with Graph API version 2.4, Facebook has limited the default fields returned when fetching the user profile.
Fields can be explicitly requested using the `profile_fields` option:

```elixir
config :ueberauth, Ueberauth,
providers: [
facebook: {Ueberauth.Strategy.Facebook, [profile_fields: "name,email,first_name,last_name"]}
]
```

See [Graph API Reference > User](https://developers.facebook.com/docs/graph-api/reference/user) for full list of fields.

## Copyright and License

Copyright (c) 2015 Sean Callan

Released under the MIT License, which can be found in the repository in [LICENSE](./LICENSE).