Add Basic License Key generation (#1298)

Author: michaeljguarino

apps/core/lib/core/services/accounts.ex

@@ -3,6 +3,7 @@ defmodule Core.Services.Accounts do
   import Core.Policies.Account
   alias Core.PubSub
   alias Core.Services.{Users, Payments}
+  alias Core.Auth.Jwt
   alias Core.Schema.{
     User,
     Account,
@@ -416,6 +417,14 @@ defmodule Core.Services.Accounts do
   def impersonate_service_account(%User{} = service_account, %User{} = user),
     do: allow(service_account, user, :impersonate)
 
+
+  def license_key() do
+    exp = Timex.now() |> Timex.shift(days: 365) |> Timex.to_unix()
+    with {:ok, claims} <- Jwt.generate_claims(%{"enterprise" => true, "exp" => exp}),
+         {:ok, token, _} <- Jwt.encode_and_sign(claims, Jwt.signer()),
+      do: {:ok, token}
+  end
+
   @doc """
   Fetch all users that can impersonate this service account.  Return just the user if not a service account
   """

apps/core/test/services/accounts_test.exs

@@ -3,6 +3,7 @@ defmodule Core.Services.AccountsTest do
   use Mimic
   alias Core.PubSub
   alias Core.Services.Accounts
+  alias Core.Auth.Jwt
 
   describe "#create_service_account/2" do
     setup [:setup_root_user]
@@ -757,6 +758,20 @@ defmodule Core.Services.AccountsTest do
     end
   end
 
+  describe "#license_key/0" do
+    test "It can generate a valid year-long jwt with an enterprise claim" do
+      {:ok, token} = Accounts.license_key()
+
+      signer = Jwt.signer()
+      {:ok, claims} = Jwt.verify(token, signer)
+
+      assert claims["enterprise"]
+
+      assert Timex.from_unix(claims["exp"])
+             |> Timex.after?(Timex.shift(Timex.now(), days: 364))
+    end
+  end
+
   describe "#recompute_usage/1" do
     test "it correctly recomputes an accounts usage" do
       ac1 = insert(:account)