#21: Generate JWT tokens for API development

lib/mix/tasks/smart_home/gen_token.ex

@@ -0,0 +1,12 @@
+defmodule Mix.Tasks.SmartHome.GenToken do
+  use Mix.Task
+
+  @shortdoc "Generate a JWT token for use with local API development"
+  def run(_) do
+    IO.puts("Generating JWT Token...")
+    jwt = SmartHomeAuth.gen_auth_token()
+
+    IO.puts("\n\n")
+    IO.puts(jwt)
+  end
+end

lib/smart_home_auth.ex

@@ -7,4 +7,18 @@ defmodule SmartHomeAuth do
   if it comes from the database, an external API or others.
 
   """
+
+  @doc """
+  Generate a local-use authentication token for API development.
+  """
+  @spec gen_auth_token :: binary
+  def gen_auth_token do
+    AuthPlug.Token.generate_jwt!(
+      %{
+        "id" => 1,
+        "email" => "[email protected]",
+        "auth_provider" => "local-dev",
+        "givenName" => "Dev Superuser"
+      })
+  end
 end

test/mix/tasks/smart_home_test.exs

@@ -0,0 +1,15 @@
+defmodule Mix.Tasks.SmartHomeTest do
+  use ExUnit.Case
+  import ExUnit.CaptureIO
+
+  @jwt_pattern ~r/[A-Za-z0-9-_=]+\.[A-Za-z0-9-_=]+\.?[A-Za-z0-9-_.+\/=]*$/m
+
+  test "Mix task returns a valid JWT" do
+    out = capture_io(fn -> Mix.Tasks.SmartHome.GenToken.run([]) end)
+
+    jwt = Regex.run(@jwt_pattern, out) |> List.first()
+
+    decoded = AuthPlug.Token.verify_jwt!(jwt)
+    assert %{"id" => 1} = decoded
+  end
+end

test/smart_home_auth/helper_test.exs

@@ -0,0 +1,11 @@
+defmodule SmartHomeAuth.HelperTest do
+  use ExUnit.Case, async: true
+
+  test "gen_auth_token generates a correct token" do
+    token = SmartHomeAuth.gen_auth_token()
+
+    decoded = AuthPlug.Token.verify_jwt!(token)
+
+    assert %{"id" => 1} = decoded
+  end
+end