ueberauth_spotify_oauth

defmodule Ueberauth.Strategy.Spotify.OAuth do
  @moduledoc """

  OAuth2 for Spotify.



  Add `client_id` and `client_secret` to your configuration:



      config :ueberauth, Ueberauth.Strategy.Spotify.OAuth,

        client_id: System.get_env("SPOTIFY_CLIENT_ID"),

        client_secret: System.get_env("SPOTIFY_CLIENT_SECRET")

  """

  use OAuth2.Strategy

  @account_url "https://accounts.spotify.com"

  @defaults [

    strategy: __MODULE__,

    site: "https://api.spotify.com/",

    authorize_url: "#{@account_url}/authorize",

    token_url: "#{@account_url}/api/token"

  ]

  @doc """

  Construct a client for request to Spotify.



  This will be setup automatically for youi n `Ueberauth.Strategy.Spotify`.



  These options are only usefule for usage outside the normal callback phase of Ueberauth.



  Examples:



      iex> Ueberauth.Strategy.Spotify.OAuth.client().__struct__

      OAuth2.Client

  """
  def client(opts \\ []) do
    @defaults
    |> Keyword.merge(config())
    |> Keyword.merge(opts)
    |> OAuth2.Client.new
  end

  @doc """

  Provides the authorize url for the request phase of Ueberauth. No need to call this usually.



  Examples:



      iex> Ueberauth.Strategy.Spotify.OAuth.authorize_url!() =~ ~r/^https:\\/\\/accounts.spotify.com\\/authorize/

      true

  """
  def authorize_url!(params \\ [], opts \\ []) do
    opts
    |> client
    |> OAuth2.Client.authorize_url!(params)
  end

  @doc """

  Gets the Access Token from Spotify

  """
  def get_token!(params \\ [], opts \\ []) do
    IO.inspect(params, label: "Token Params")
    client = opts
    |> client
    |> OAuth2.Client.get_token!(params)

    client.token
  end

  @doc """

  Helper method to query Spotify API endpoints

  """
  def get(token, url, headers \\ [], opts \\ []) do
    [token: token]
    |> client
    |> OAuth2.Client.get(url, headers, opts)
  end

  @doc false
  def authorize_url(client, params) do
    OAuth2.Strategy.AuthCode.authorize_url(client, params)
  end

  def get_token(client, params, headers) do
    client
    |> put_param("client_secret", client.client_secret)
    |> put_header("Accept", "application/json")
    |> OAuth2.Strategy.AuthCode.get_token(params, headers)
  end

  def get_token_with_refresh(refresh_token, redirect_uri) do
    client = client()
    opts = [
      redirect_uri: redirect_uri,
      strategy: OAuth2.Strategy.Refresh
    ]

    client = opts
    |> client
    |> put_param("grant_type", "refresh_token")
    |> put_param("refresh_token", refresh_token)
    |> put_header("Accept", "application/json")
    |> put_header("Authorization", "Basic #{Base.encode64(client.client_id <> ":" <> client.client_secret)}")
    |> OAuth2.Client.get_token!([])
  end

  defp config, do: Application.get_env(:ueberauth, Ueberauth.Strategy.Spotify.OAuth, [])
end