I am have followed this blog to setup guardian authentication for my api using JWT.

However, I am running into the following issues:

1. I need to sign in twice before my authorization works
2. The sign out isn’t working. Even after signing out I can still access the restricted routes.

mix.exs:

{:phoenix, "~> 1.4.0"},
      {:phoenix_pubsub, "~> 1.1"},
      {:phoenix_ecto, "~> 4.0"},
      {:ecto_sql, "~> 3.0"},
      {:postgrex, ">= 0.0.0"},
      {:phoenix_html, "~> 2.11"},
      {:phoenix_live_reload, "~> 1.2", only: :dev},
      {:gettext, "~> 0.11"},
      {:jason, "~> 1.0"},
      {:plug_cowboy, "~> 2.0"},
      {:distillery, "~> 2.0", runtime: false},
      {:neuron, "~> 1.1.0"},

      # User authentication
      {:ueberauth, "~> 0.6.1"},
      {:ueberauth_github, "~> 0.7"},
      {:guardian, "~> 1.2.1"},
      {:comeonin, "~> 5.0"},
      {:bcrypt_elixir, "~> 2.0"},

router.ex

defmodule ProfiloWeb.Router do
  use ProfiloWeb, :router

  pipeline :jwt_authenticated do
    plug ProfiloWeb.Pipe.UserAuth
  end

  pipeline :api do
    plug :accepts, ["json"]
  end

  scope "/api/v1", ProfiloWeb do
    pipe_through :api

    post "/sign-up", UserController, :create
    post "/sign-in", UserController, :sign_in
    post "/sign-out", UserController, :sign_out

  end

  scope "/api/v1", ProfiloWeb do
    pipe_through [:api, :jwt_authenticated]

    get "/my-user", UserController, :show
  end
end

user_auth.ex

defmodule ProfiloWeb.Pipe.UserAuth do
  use Guardian.Plug.Pipeline,
    otp_app: :profilo,
    error_handler: ProfiloWeb.Pipe.UserAuthError,
    module: Profilo.Accounts.Lib.Guardian


  # If there is an authorization header, restrict it to an access token and validate it
  plug Guardian.Plug.VerifyHeader, realm: "Bearer"

  # Load the user if either of the verifications worked
  plug Guardian.Plug.LoadResource

  plug Guardian.Plug.EnsureAuthenticated
end

user_controller.ex

defmodule ProfiloWeb.UserController do
  use ProfiloWeb, :controller

  alias Profilo.Accounts.Lib.Guardian
  alias Profilo.Accounts
  alias Profilo.Accounts.Lib.User

  action_fallback ProfiloWeb.FallbackController

  def create(conn, %{"user" => user_params}) do
    with {:ok, %User{} = user} <- Accounts.create_user(user_params),
        {:ok, token, _claims} <- Guardian.encode_and_sign(user)
    do
      conn |> render("jwt.json", jwt: token)
    end
  end

  def sign_in(conn, %{"email" => email, "password" => password}) do
    case Accounts.token_sign_in(email, password) do
      {:ok, token, _claims} ->
        conn |> render("jwt.json", jwt: token)
      _ ->
        {:error, :unauthorized}
    end
  end

  def show(conn, _params) do
    user = Guardian.Plug.current_resource(conn)
    conn |> render("user.json", user: user)
  end

  def sign_out(conn, _params) do
    conn
    |> Guardian.Plug.sign_out()
    |> render("logout.json", _params)
  end
end

Commands used:

➜  profilo git:(master) ✗ curl -XPOST -H "Content-type: application/json" -
d '{
  "email": "test@gmal.com",
  "password": "123456"
}' 'http://localhost:4000/api/v1/sign-in'
{"jwt":"eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJhdWQiOiJwcm9maWxvIiwiZXhwIj
oxNTU3MTk1MzY2LCJpYXQiOjE1NTQ3NzYxNjYsImlzcyI6InByb2ZpbG8iLCJqdGkiOiI2MGVlY
mQ4Yy0xMTEwLTQ0MTctYTFhNS0xNDc0OTRmYjYxOGEiLCJuYmYiOjE1NTQ3NzYxNjUsInN1YiI6
IjEwIiwidHlwIjoiYWNjZXNzIn0.aFA4Z93JRYwITELD5uiWqWPwO4tfeYqA0cKDRz8T6VNLByz
4Oge3F4nGM9MFcVNMUnVl6oaozFsDW-NTMY8oUA"}%  
                         
➜  profilo git:(master) ✗ curl -XGET -H 'Authorization: Bearer eyJhbGciOiJI
UzUxMiIsInR5cCI6IkpXVCJ9.eyJhdWQiOiJwcm9maWxvIiwiZXhwIj oxNTU3MTk1MzY2LCJpY
XQiOjE1NTQ3NzYxNjYsImlzcyI6InByb2ZpbG8iLCJqdGkiOiI2MGVlY mQ4Yy0xMTEwLTQ0MTc
tYTFhNS0xNDc0OTRmYjYxOGEiLCJuYmYiOjE1NTQ3NzYxNjUsInN1YiI6 IjEwIiwidHlwIjoiY
WNjZXNzIn0.aFA4Z93JRYwITELD5uiWqWPwO4tfeYqA0cKDRz8T6VNLByz 4Oge3F4nGM9MFcVN
MUnVl6oaozFsDW-NTMY8oUA' 'http://localhost:4000/api/v1/my-user'
{"error":"invalid_token"}%                                           
      
➜  profilo git:(master) ✗ curl -XPOST -H "Content-type: application/json" -
d '{  "email": "test@gmal.com",  "password": "123456"}' 'http://localhost:4000/api/v1/sign-in'{"jwt":"eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJhdWQiOiJwcm9maWxvIiwiZXhwIjoxNTU3MTk1Mzg4LCJpYXQiOjE1NTQ3NzYxODgsImlzcyI6InByb2ZpbG8iLCJqdGkiOiJmM2JhMjM5ZS0yMjdkLTQ4ZTktODA5Zi0wZmM5NDBlMGRlNWUiLCJuYmYiOjE1NTQ3NzYxODcsInN1YiI6IjEwIiwidHlwIjoiYWNjZXNzIn0.n48SoK0bqkc-1Ms45udl-hS6j6bibUe33bTt4gQ7syxAUFbZhiRsiHm5TOv4nZY7j1lddAJ-tjSOHd--1oO-HA"}%     
                            
➜  profilo git:(master) ✗ curl -XGET -H 'Authorization: Bearer eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJhdWQiOiJwcm9maWxvIiwiZXhwIjoxNTU3MTk1Mzg4LCJpYXQiOjE1NTQ3NzYxODgsImlzcyI6InByb2ZpbG8iLCJqdGkiOiJmM2JhMjM5ZS0yMjdkLTQ4ZTktODA5Zi0wZmM5NDBlMGRlNWUiLCJuYmYiOjE1NTQ3NzYxODcsInN1YiI6IjEwIiwidHlwIjoiYWNjZXNzIn0.n48SoK0bqkc-1Ms45udl-hS6j6bibUe33bTt4gQ7syxAUFbZhiRsiHm5TOv4nZY7j1lddAJ-tjSOHd--1oO-HA' 'http://localhost:4000/api/v1/my-user'
{"email":"test@gmal.com","id":10}%  
                                       
➜  profilo git:(master) ✗ curl -XPOST -H 'Authorization: Bearer eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJhdWQiOiJwcm9maWxvIiwiZXhwIjoxNTU3MTk1Mzg4LCJpYXQiOjE1NTQ3NzYxODgsImlzcyI6InByb2ZpbG8iLCJqdGkiOiJmM2JhMjM5ZS0yMjdkLTQ4ZTktODA5Zi0wZmM5NDBlMGRlNWUiLCJuYmYiOjE1NTQ3NzYxODcsInN1YiI6IjEwIiwidHlwIjoiYWNjZXNzIn0.n48SoK0bqkc-1Ms45udl-hS6j6bibUe33bTt4gQ7syxAUFbZhiRsiHm5TOv4nZY7j1lddAJ-tjSOHd--1oO-HA' 'http://localhost:4000/api/v1/sign-out'
{"message":"Logged out"}%        
                                          
➜  profilo git:(master) ✗ curl -XGET -H 'Authorization: Bearer eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJhdWQiOiJwcm9maWxvIiwiZXhwIjoxNTU3MTk1Mzg4LCJpYXQiOjE1NTQ3NzYxODgsImlzcyI6InByb2ZpbG8iLCJqdGkiOiJmM2JhMjM5ZS0yMjdkLTQ4ZTktODA5Zi0wZmM5NDBlMGRlNWUiLCJuYmYiOjE1NTQ3NzYxODcsInN1YiI6IjEwIiwidHlwIjoiYWNjZXNzIn0.n48SoK0bqkc-1Ms45udl-hS6j6bibUe33bTt4gQ7syxAUFbZhiRsiHm5TOv4nZY7j1lddAJ-tjSOHd--1oO-HA' 'http://localhost:4000/api/v1/my-user'
{"email":"test@gmal.com","id":10}%