defp deps do
  [
    # ...
    {:assent, "~> 0.2.9"}
  ]
end

defp deps do
  [
    # ...
    # Required for SSL validation when using the `:httpc` adapter
    {:certifi, "~> 2.4"},
    {:ssl_verify_fun, "~> 1.1"}
  ]
end

def application do
  [
    # ...
    extra_applications: [
      # ...
      :inets
    ]
  ]
end

defmodule ProviderAuth do
  import Plug.Conn

  alias Assent.{Config, Strategy.Github}

  @config [
    client_id: "REPLACE_WITH_CLIENT_ID",
    client_secret: "REPLACE_WITH_CLIENT_SECRET",
    redirect_uri: "http://localhost:4000/auth/github/callback"
  ]

  # http://localhost:4000/auth/github
  def request(conn) do
    @config
    |> Github.authorize_url()
    |> case do
      {:ok, %{url: url, session_params: session_params}} ->
        # Session params (used for OAuth 2.0 and OIDC strategies) will be
        # retrieved when user returns for the callback phase
        conn = put_session(conn, :session_params, session_params)

        # Redirect end-user to Github to authorize access to their account
        conn
        |> put_resp_header("location", url)
        |> send_resp(302, "")

      {:error, error} ->
        # Something went wrong generating the request authorization url
    end
  end

  # http://localhost:4000/auth/github/callback
  def callback(conn) do
    # End-user will return to the callback URL with params attached to the
    # request. These must be passed on to the strategy. In this example we only
    # expect GET query params, but the provider could also return the user with
    # a POST request where the params is in the POST body.
    %{params: params} = fetch_query_params(conn)

    # The session params (used for OAuth 2.0 and OIDC strategies) stored in the
    # request phase will be used in the callback phase
    session_params = get_session(conn, :session_params)

    @config
    # Session params should be added to the config so the strategy can use them
    |> Config.put(:session_params, session_params)
    |> Github.callback(params)
    |> case do
      {:ok, %{user: user, token: token}} ->
        # Authorization succesful

      {:error, error} ->
        # Authorizaiton failed
    end
  end
end

config :my_app, :strategies,
  github: [
    client_id: "REPLACE_WITH_CLIENT_ID",
    client_secret: "REPLACE_WITH_CLIENT_SECRET",
    strategy: Assent.Strategy.Github
  ],
  # ...

defmodule MultiProviderAuth do
  alias Assent.Config

  @spec request(atom()) :: {:ok, map()} | {:error, term()}
  def request(provider) do
    config = config!(provider)

    config[:strategy].authorize_url()
  end

  @spec callback(atom(), map(), map()) :: {:ok, map()} | {:error, term()}
  def callback(provider, params, session_params) do
    config = config!(provider)

    config
    |> Assent.Config.put(:session_params, session_params)
    |> config[:strategy].callback(params)
  end

  defp config!(provider) do
    config =
      Application.get_env(:my_app, :strategies)[provider] ||
        raise "No provider configuration for #{provider}"
    
    Config.put(config, :redirect_uri, "http://localhost:4000/oauth/#{provider}/callback")
  end
end

defmodule TestProvider do
  use Assent.Strategy.OAuth2.Base

  @impl true
  def default_config(_config) do
    [
      # `:base_url` will be used for any paths below
      base_url: "http://localhost:4000/api/v1",
       # Definining an absolute URI overrides the `:base_url`
      authorize_url: "http://localhost:4000/oauth/authorize",
      token_url: "/oauth/access_token",
      user_url: "/user",
      authorization_params: [scope: "email profile"],
      auth_method: :client_secret_post
    ]
  end

  @impl true
  def normalize(_config, user) do
    {:ok,
      # Conformed to https://openid.net/specs/openid-connect-core-1_0.html#rfc.section.5.1
      %{
        "sub"      => user["sub"],
        "name"     => user["name"],
        "nickname" => user["username"],
        "email"    => user["email"]
      # },
      # # Provider specific data not part of the standard claims spec
      # %{
      #   "http://localhost:4000/bio" => user["bio"]
      }
    }
  end
end

defmodule TestProvider do
  @behaviour Assent.Strategy

  @spec authorize_url(Keyword.t()) :: {:ok, %{url: binary()}} | {:error, term()}
  def authorize_url(config) do
    # Generate authorization url
  end

  @spec callback(Keyword.t(), map()) :: {:ok, %{user: map(), token: map()}} | {:error, term()}
  def callback(config, params) do
    # Handle callback response
  end
end

config = [
  client_id: "REPLACE_WITH_CLIENT_ID",
  client_secret: "REPLACE_WITH_CLIENT_SECRET",
  http_adapter: Assent.HTTPAdapter.Httpc
]

config :assent, http_adapter: Assent.HTTPAdapter.Httpc

defp deps do
  [
    # ...
    {:req, "~> 0.4"}
  ]
end

defp deps do
  [
    # ...
    # Required for SSL validation if using the `:httpc` adapter
    {:certifi, "~> 2.4"},
    {:ssl_verify_fun, "~> 1.1"}
  ]
end

defp deps do
  [
    # ...
    {:finch, "~> 0.16"}
  ]
end

config = [
  client_id: "REPLACE_WITH_CLIENT_ID",
  client_secret: "REPLACE_WITH_CLIENT_SECRET",
  http_adapter: {Assent.HTTPAdapter.Finch, supervisor: MyFinch}
]

defp deps do
  [
    # ...
    {:jose, "~> 1.8"}
  ]
end

config = [
  client_id: "REPLACE_WITH_CLIENT_ID",
  client_secret: "REPLACE_WITH_CLIENT_SECRET",
  jwt_adapter: Assent.JWTAdapter.JOSE
]

config :assent, jwt_adapter: AssAssent.JWTAdapter.JOSE