Add GET transaction info api call (#5)

* Add intial steps for transaction info

* Adding some test resources from the python lib

Available at: https://github.com/apple/app-store-server-library-python

* Add 200 response for get_transacion_info test

* Remove support files

* Remove decode function. Not within the scope of this PR

* Bump minor version to 0.2.0

* Revert to v0.1.0, add details to CHANGELOG

* remove empty line

CHANGELOG.md

@@ -9,3 +9,7 @@
 ## v0.1.0
 
 Initial release
+
+## v0.2.0
+
+- Added a call to GET transaction info by transaction ID `AppStore.API.TransactionInfo`

lib/app_store/api/api.ex

@@ -3,7 +3,12 @@ defmodule AppStore.API do
   The main module to interact with the App Store Server APIs
   """
 
-  alias AppStore.API.{TransactionHistory, SubscriptionStatus, ConsumptionInformation}
+  alias AppStore.API.{
+    TransactionHistory,
+    TransactionInfo,
+    SubscriptionStatus,
+    ConsumptionInformation
+  }
 
   defdelegate get_transaction_history(
                 api_config,
@@ -13,6 +18,9 @@ defmodule AppStore.API do
               ),
               to: TransactionHistory
 
+  defdelegate get_transaction_info(api_config, token, transaction_id),
+    to: TransactionInfo
+
   defdelegate get_subscription_statuses(api_config, token, original_transaction_id),
     to: SubscriptionStatus
 

lib/app_store/api/transaction_info.ex

@@ -0,0 +1,24 @@
+defmodule AppStore.API.TransactionInfo do
+  @moduledoc """
+  The module for Transaction Info
+  """
+
+  alias AppStore.API.{Config, Response, Error, HTTP}
+
+  @type transaction_id :: String.t()
+
+  @path_prefix "/inApps/v1/transactions/"
+
+  @doc """
+  Get information about a single transaction for your app.
+
+  Official documentation: https://developer.apple.com/documentation/appstoreserverapi/get_transaction_info
+  """
+  @spec get_transaction_info(Config.t(), String.t(), transaction_id) ::
+          {:error, Error.t()} | {:ok, Response.t()}
+  def get_transaction_info(%Config{} = api_config, token, transaction_id) do
+    path = "#{@path_prefix}/#{transaction_id}"
+
+    HTTP.get(api_config, token, path)
+  end
+end

mix.exs

@@ -35,9 +35,6 @@ defmodule AppStore.MixProject do
   # Run "mix help deps" to learn about dependencies.
   defp deps do
     [
-      # {:dep_from_hexpm, "~> 0.3.0"},
-      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
-
       # runtime deps
       {:finch, "~> 0.6"},
       {:jason, "~> 1.0"},

test/app_store/api/transaction_info_test.exs

@@ -0,0 +1,45 @@
+defmodule AppStore.API.TransactionInfoTest do
+  use AppStore.TestCase, async: false
+
+  alias AppStore.API.TransactionInfo
+
+  describe "get_transaction_info/3" do
+    test "returns 200 and an expected response body", %{bypass: bypass, app_store: app_store} do
+      expected_body = %{signedTransactionInfo: "signed_transaction_info_value"} |> Jason.encode!()
+
+      Bypass.expect_once(bypass, "GET", "/inApps/v1/transactions/1234", fn conn ->
+        conn
+        |> Plug.Conn.put_resp_header("server", "daiquiri/3.0.0")
+        |> Plug.Conn.resp(200, expected_body)
+      end)
+
+      {:ok, %AppStore.API.Response{body: body, status: status}} =
+        TransactionInfo.get_transaction_info(
+          app_store.api_config,
+          "token",
+          "1234"
+        )
+
+      assert status === 200
+      assert body === expected_body
+    end
+
+    test "returns 401 for unauthenticated request", %{bypass: bypass, app_store: app_store} do
+      Bypass.expect_once(bypass, "GET", "/inApps/v1/transactions/transaction-id", fn conn ->
+        conn
+        |> Plug.Conn.put_resp_header("server", "daiquiri/3.0.0")
+        |> Plug.Conn.resp(401, "Unauthenticated\n\nRequest ID: PXYVB35MOBBC5TL6UOXY6DGJGY.0.0\n")
+      end)
+
+      {:ok, %AppStore.API.Response{body: body, status: status}} =
+        TransactionInfo.get_transaction_info(
+          app_store.api_config,
+          "token",
+          "transaction-id"
+        )
+
+      assert status === 401
+      assert body === "Unauthenticated\n\nRequest ID: PXYVB35MOBBC5TL6UOXY6DGJGY.0.0\n"
+    end
+  end
+end