View Source Assent.Strategy.Apple (Assent v0.2.9)

Apple Sign In OAuth 2.0 strategy.

You'll need to collect the 10-char long Team ID, the Services ID, the 10-char Key ID and download the private key from the portal. Save the private key to an accessible folder, or alternatively set :private_key with the content of the private key.

Usage 

config = [
  client_id: "REPLACE_WITH_SERVICES_ID",
  team_id: "REPLACE_WITH_TEAM_ID",
  private_key_id: "REPLACE_WITH_PRIVATE_KEY_ID",
  private_key_path: "/path/to/private_key.p8",
  redirect_uri: "http://localhost:4000/auth/callback"
]

With JS SDK

You can use the JS SDK instead of handling it through auhorize_url/2. All you have to do is to set up you HTML page with the following way:

<html>
  <head>
      <meta name="appleid-signin-client-id" content="[CLIENT_ID]">
      <meta name="appleid-signin-scope" content="[SCOPES]">
      <meta name="appleid-signin-redirect-uri" content="[REDIRECT_URI]">
      <meta name="appleid-signin-state" content="[STATE]">
  </head>
  <body>
      <div id="appleid-signin" data-color="black" data-border="true" data-type="sign in"></div>
      <script type="text/javascript" src="https://appleid.cdn-apple.com/appleauth/static/jsapi/appleid/1/en_US/appleid.auth.js"></script>
  </body>
</html>

You can get the state by generating the session params using the authorize_url/2:

{:ok, %{session_params: session_params}} = Assent.Strategy.Apple.authorize_url(config)

Use the session_params[:state] value for [STATE]. The callback phase would be identical to how it's explained in the README.

See https://developer.apple.com/documentation/signinwithapplejs/configuring_your_webpage_for_sign_in_with_apple for more.