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A foundation for building Elixir Phoenix apps — SaaS, social networks, ERP systems, marketplaces, and more

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phoenix_kit lib phoenix_kit_web plugs ensure_oauth_config.ex
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lib/phoenix_kit_web/plugs/ensure_oauth_config.ex 

defmodule PhoenixKitWeb.Plugs.EnsureOAuthConfig do

  @moduledoc """

  Plug that ensures OAuth credentials are loaded into Application env before OAuth requests.



  This plug loads OAuth provider credentials from the database and configures

  them in Application env so that `Ueberauth.run_request/4` and `Ueberauth.run_callback/4`

  can access them at runtime.



  ## How It Works



  1. Checks if Ueberauth configuration exists in Application env

  2. If configuration is missing, loads credentials from database via `OAuthConfig.configure_providers()`

  3. If loading fails, returns 503 Service Unavailable error

  4. Otherwise, allows request to proceed



  ## Usage



  Used in OAuth controller before dynamic Ueberauth calls:



      plug PhoenixKitWeb.Plugs.EnsureOAuthConfig

      # Then in controller actions:

      # Ueberauth.run_request(conn, provider, provider_config)

      # Ueberauth.run_callback(conn, provider, provider_config)



  ## Why This Is Needed



  PhoenixKit stores OAuth credentials in the database. This plug ensures

  credentials are loaded into Application env before Ueberauth strategy

  modules attempt to read them.

  """



  import Plug.Conn

  require Logger



  alias PhoenixKit.Config



  def init(opts), do: opts



  def call(conn, _opts) do

    case ensure_oauth_config() do

      :ok ->

        conn



      {:error, reason} ->

        Logger.error("OAuth configuration unavailable: #{inspect(reason)}")



        conn

        |> put_resp_content_type("text/html")

        |> send_resp(503, """

        <html>

          <head><title>Service Temporarily Unavailable</title></head>

          <body>

            <h1>OAuth Service Unavailable</h1>

            <p>OAuth authentication is temporarily unavailable. Please try again later.</p>

            <p>If this problem persists, please contact support.</p>

          </body>

        </html>

        """)

        |> halt()

    end

  end



  defp ensure_oauth_config do

    providers = Config.UeberAuth.get_providers()



    case providers do

      providers when is_map(providers) or is_list(providers) ->

        # Configuration exists, all good

        :ok



      _ ->

        # Configuration missing, try to load it

        Logger.warning("Ueberauth :providers missing, attempting to load OAuth configuration")

        load_oauth_config()

    end

  end



  defp load_oauth_config do

    if Code.ensure_loaded?(PhoenixKit.Users.OAuthConfig) do

      try do

        alias PhoenixKit.Users.OAuthConfig

        OAuthConfig.configure_providers()

        Logger.info("OAuth configuration loaded successfully via fallback plug")

        :ok

      rescue

        error ->

          Logger.error("Failed to load OAuth configuration: #{inspect(error)}")

          {:error, :configuration_load_failed}

      end

    else

      Logger.error("PhoenixKit.Users.OAuthConfig module not available")

      {:error, :oauth_module_not_loaded}

    end

  end

end