add initial billing checkout step (refers #9)

config/dev.exs

@@ -45,8 +45,7 @@ config :nova, Nova.Repo,
   port: System.get_env("NOVA_DB_PORT"),
   pool_size: 10
 
-config :dogma,
-  exclude: [
-    ~r(\Atest/),
-    ~r(\Aconfig/)
-  ]
+config :nova, :payment_gateway,
+  type: Commerce.Billing.Gateways.Bogus,
+  credentials: {"", ""},
+  default_currency: "USD"

config/test.exs

@@ -24,3 +24,8 @@ config :nova, Nova.Repo,
   database: "nova_test",
   port: System.get_env("NOVA_DB_PORT"),
   pool: Ecto.Adapters.SQL.Sandbox
+
+config :nova, :payment_gateway,
+  type: Commerce.Billing.Gateways.Bogus,
+  credentials: {"", ""},
+  default_currency: "USD"

lib/nova.ex

@@ -13,7 +13,7 @@ defmodule Nova do
       # Start the Ecto repository
       worker(Nova.Repo, []),
       # Here you could define other workers and supervisors as children
-      # worker(Nova.Worker, [arg1, arg2, arg3]),
+      worker(Commerce.Billing.Worker, payment_settings)
     ]
 
     # See http://elixir-lang.org/docs/stable/elixir/Supervisor.html
@@ -28,4 +28,15 @@ defmodule Nova do
     Nova.Endpoint.config_change(changed, removed)
     :ok
   end
+
+  defp payment_settings do
+    config = Application.get_env(:nova, :payment_gateway)
+    type   = Dict.get(config, :type)
+    settings = %{
+      credentials: Dict.get(config, :credentials),
+      default_currency: Dict.get(config, :default_currency)
+    }
+
+    [type, settings, [name: :payment_gateway]]
+  end
 end

lib/nova/checkout/billing.ex

@@ -0,0 +1,56 @@
+defmodule Nova.Checkout.Billing do
+  @moduledoc """
+  Provides `:billing` behaviour for checkout.
+
+  This mostly serves as an example to build a custom checkout.
+  """
+
+  alias Commerce.Billing
+
+  defmacro __using__(_opts) do
+    quote do
+      @doc """
+      Defines billing behaviour for checkout.
+      """
+      def checkout(order, :billing, params) do
+        result = Billing.authorize(
+          :payment_gateway,
+          order.total,
+          get_card(params["credit_card"]),
+          billing_address: get_address(params["billing_address"]),
+          description: "Payment for order #{order.id}"
+        )
+
+        case result do
+          {:ok, payment_response} -> {:ok, order, payment_response}
+          {:error, payment_response} -> {:error, order, payment_response.error}
+        end
+      end
+
+      defp get_card(params) do
+        %Billing.CreditCard{
+          name:       params["name"],
+          number:     params["number"],
+          expiration: get_expiration(params["year"], params["month"]),
+          cvc:        params["cvc"]
+        }
+      end
+
+      defp get_expiration(year, month) when byte_size(year) > 0 and byte_size(month) > 0 do
+        {String.to_integer(year), String.to_integer(month)}
+      end
+      defp get_expiration(_, _), do: {0, 0}
+
+      defp get_address(params) do
+        %Billing.Address{
+          street1:     params["street1"],
+          street2:     params["street2"],
+          city:        params["city"],
+          region:      params["region"],
+          country:     params["country"],
+          postal_code: params["postal_code"]
+        }
+      end
+    end
+  end
+end

mix.exs

@@ -50,9 +50,10 @@ defmodule Nova.Mixfile do
       {:phoenix_html, "~> 2.2"},
       {:phoenix_live_reload, "~> 1.0", only: :dev},
       {:cowboy, "~> 1.0"},
+      {:commerce_billing, github: "joshnuss/commerce_billing"},
       {:ex_spec, "~> 0.3.0", only: :test},
       # using git version to support fixtures/2
-      {:ecto_fixtures, git: "https://github.com/dockyard/ecto_fixtures.git", branch: "master", only: :test},
+      {:ecto_fixtures, github: "dockyard/ecto_fixtures", branch: "master", only: :test},
       {:dogma, "~> 0.0", only: :dev},
       {:excoveralls, only: ~w(dev test)a}
     ]

mix.lock

@@ -1,16 +1,22 @@
-%{"cowboy": {:hex, :cowboy, "1.0.3"},
+%{"commerce_billing": {:git, "https://github.com/joshnuss/commerce_billing.git", "b5a49ac82c09de9bb70e7da1ef5f5f6231a485b9", []},
+  "cowboy": {:hex, :cowboy, "1.0.3"},
   "cowlib": {:hex, :cowlib, "1.0.1"},
   "decimal": {:hex, :decimal, "1.1.0"},
   "dogma": {:hex, :dogma, "0.0.8"},
   "ecto": {:hex, :ecto, "1.0.3"},
   "ecto_fixtures": {:git, "https://github.com/dockyard/ecto_fixtures.git", "21be22d47737626098304768cf661d79bb281301", [branch: "master"]},
+  "ex_doc": {:hex, :ex_doc, "0.10.0"},
   "ex_spec": {:hex, :ex_spec, "0.3.0"},
   "excoveralls": {:hex, :excoveralls, "0.3.11"},
   "exjsx": {:hex, :exjsx, "3.2.0"},
   "fs": {:hex, :fs, "0.9.2"},
   "hackney": {:hex, :hackney, "1.3.2"},
+  "httpoison": {:hex, :httpoison, "0.7.4"},
   "idna": {:hex, :idna, "1.0.2"},
+  "jazz": {:hex, :jazz, "0.2.1"},
   "jsx": {:hex, :jsx, "2.6.2"},
+  "meck": {:hex, :meck, "0.8.3"},
+  "mock": {:hex, :mock, "0.1.1"},
   "phoenix": {:hex, :phoenix, "1.0.2"},
   "phoenix_ecto": {:hex, :phoenix_ecto, "1.2.0"},
   "phoenix_html": {:hex, :phoenix_html, "2.2.0"},

test/nova/checkout/billing_test.exs

@@ -0,0 +1,39 @@
+defmodule Nova.Checkout.BillingTest do
+  use Nova.ModelCase
+
+  defmodule TestCart do
+    use Nova.Checkout.Billing
+  end
+
+  setup do
+    order = fixtures(:orders).orders.base
+
+    {:ok, order: order}
+  end
+
+  @params %{
+    "billing_address" => %{
+      "street1" => "example street1",
+      "street2" => "example street2",
+      "city" => "Testville",
+      "region" => "Region",
+      "country" => "IT",
+      "postal_code" => "12345"
+    },
+    "credit_card" => %{
+      "name" => "John Doe",
+      "number" => "4111111111111111",
+      "month" => "10",
+      "year" => "2019",
+      "cvc" => "123"
+    }
+  }
+
+  describe "checkout/3" do
+    context "with valid data" do
+      it "sends billing address and credit card to payment gateway", ctx do
+        assert {:ok, _, _} = TestCart.checkout(ctx.order, :billing, @params)
+      end
+    end
+  end
+end