Monthly Downloads: 6
Programming language: Elixir
License: MIT License
Tags: Authentication    
Latest version: v0.1.0

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OAuth2 Facebook

A Facebook OAuth2 Provider for Elixir

Build Status Coverage Status

OAuth2 Facebook is convenience library built on top of oauth2. It adds Facebook specific functions to interact with the Facebook Graph endpoints using OAuth2.


# mix.exs

def application do
  # Add the application to your list of applications.
  # This will ensure that it will be included in a release.
  [applications: [:logger, :oauth2_facebook]]

defp deps do
  # Add the dependency
  [{:oauth2_facebook, "~> 0.1"}]

Authenticating a User

For an easy-to-use, end-to-end solution enabling users to log in with Facebook see ueberauth/ueberauth_facebook

One common use-case is authenticating a user's identify. The get_user! function wraps two actions into one - exchanging the callback code for a short-lived access token and using the access token to return user data:

alias OAuth2.Provider.Facebook

Facebook.get_user!([code: "<callback-code>"], [redirect_uri: "..."])

When successful, it returns the user data:

{:ok, %{"email" => "[email protected]", "gender" => "male", "id" => "101", "link" => "https://www.facebook.com/app_scoped_user_id/101/", "locale" => "en_US", "name" => "user", "timezone" => -4, "updated_time" => "2015-06-05T14:59:20+0000", "verified" => true}}

Returning an Access Token

A valid access token can be used to make multiple requests to the Facebook Graph. The callback code can be exchanged for an access token using get_token!:

alias OAuth2.Provider.Facebook

client = Facebook.get_token!([code: "<callback-code>"], [redirect_uri: "..."])

When successful, it will return a valid OAuth2.Client:

%OAuth2.Client{authorize_url: "https://www.facebook.com/dialog/oauth", client_id: "<...>", client_secret: "<...>", headers: [], params: %{}, redirect_uri: "http://localhost:3000/login/facebook/callback", ref: nil, request_opts: [], site: "https://graph.facebook.com", strategy: OAuth2.Provider.Facebook, token: %OAuth2.AccessToken{access_token: "EAABw0PjpdjcBAMDUjWQtZApFV2nFJfhIUWaw3z8MSbi92fVooa2BNBdZBeRaxMcHO94zdmncoFuZBvQQdj0cmXosa8kAZCx7wtlSR5ByT2etOhURZCNjs9DDFfpU456Gk8f0tvzmtYsiMstSKkh69kIzSVOeQIx8TPQOLpXHnRCARNXCiiB1Y", expires_at: 1507926168, other_params: %{}, refresh_token: nil, token_type: "Bearer"}, token_method: :get, token_url: "/v2.8/oauth/access_token"}

Note: The access token is kept under the client's token key.

Using a Valid Client

A valid client with an access token can then be passed into endpoint specific functions. For example, to return user data using a client with a valid access token:

alias OAuth2.Provider.Facebook

{:ok, user} = Facebook.get_user(client)

When successful, it will return the same user information:

%{"email" => "[email protected]", "gender" => "male", "id" => "101", "link" => "https://www.facebook.com/app_scoped_user_id/101/", "locale" => "en_US", "name" => "user", "timezone" => -4, "updated_time" => "2015-06-05T14:59:20+0000", "verified" => true}

Filtering User fields

Both get_user! and get_user support passing custom query params. These can be used to filter the returned attributes:

alias OAuth2.Provider.Facebook

# Using `get_user!`
user = Facebook.get_user!([code: "<callback-code>"], [redirect_uri: "..."], [fields: "email,name"])

# Using `get_user`
client = Facebook.get_token!([code: "<callback-code>"], [redirect_uri: "..."])
{:ok, user} = Facebook.get_user(client, [fields: "email,name"])

When successful, will return a trimmed down user:

%{"email" => "[email protected]", "id" => "101", "name" => "user"}

Note: The id value is always returned.