Add transaction QR Code generator

Add tests and require that address and transaction hashes are valid

apps/explorer_web/lib/explorer_web/controllers/address_qr_code_controller.ex

@@ -1,7 +1,15 @@
 defmodule ExplorerWeb.AddressQRCodeController do
   use ExplorerWeb, :controller
 
+  alias Explorer.Chain.Hash.Truncated
+
   def index(conn, %{"address_id" => id}) do
+    case Truncated.cast(id) do
+      {:ok, _} ->
         send_download(conn, {:binary, QRCode.to_png(id)}, "content-type": "image/png", filename: "#{id}.png")
+
+      _ ->
+        send_resp(conn, :not_found, "")
+    end
   end
 end

apps/explorer_web/lib/explorer_web/controllers/transaction_qr_code_controller.ex

@@ -0,0 +1,15 @@
+defmodule ExplorerWeb.TransactionQRCodeController do
+  use ExplorerWeb, :controller
+
+  alias Explorer.Chain.Hash.Full
+
+  def index(conn, %{"transaction_id" => id}) do
+    case Full.cast(id) do
+      {:ok, _} ->
+        send_download(conn, {:binary, QRCode.to_png(id)}, "content-type": "image/png", filename: "#{id}.png")
+
+      _ ->
+        send_resp(conn, :not_found, "")
+    end
+  end
+end

apps/explorer_web/lib/explorer_web/router.ex

@@ -62,6 +62,7 @@ defmodule ExplorerWeb.Router do
       )
 
       resources("/logs", TransactionLogController, only: [:index], as: :log)
+      resources("/qrcode.png", TransactionQRCodeController, only: [:index], as: :qr_code)
     end
 
     resources "/addresses", AddressController, only: [:show] do

apps/explorer_web/test/explorer_web/controllers/address_qr_code_controller_test.exs

@@ -0,0 +1,19 @@
+defmodule ExplorerWeb.AddressQRCodeControllerTest do
+  use ExplorerWeb.ConnCase
+
+  import ExplorerWeb.Router.Helpers, only: [address_qr_code_path: 4]
+
+  describe "GET index/3" do
+    test "with valid address hash returns a QR code", %{conn: conn} do
+      conn = get(conn, address_qr_code_path(conn, :index, :en, address_hash()))
+
+      assert response(conn, 200)
+    end
+
+    test "with invalid address hash returns 404", %{conn: conn} do
+      conn = get(conn, address_qr_code_path(conn, :index, :en, "0xhaha"))
+
+      assert response(conn, 404)
+    end
+  end
+end

apps/explorer_web/test/explorer_web/controllers/transaction_qr_code_controller_test.exs

@@ -0,0 +1,19 @@
+defmodule ExplorerWeb.TransactionQRCodeControllerTest do
+  use ExplorerWeb.ConnCase
+
+  import ExplorerWeb.Router.Helpers, only: [transaction_qr_code_path: 4]
+
+  describe "GET index/3" do
+    test "with valid `Hash.Full` returns a QR code", %{conn: conn} do
+      conn = get(conn, transaction_qr_code_path(conn, :index, :en, transaction_hash()))
+
+      assert response(conn, 200)
+    end
+
+    test "with invalid address hash returns 404", %{conn: conn} do
+      conn = get(conn, transaction_qr_code_path(conn, :index, :en, "0xhaha"))
+
+      assert response(conn, 404)
+    end
+  end
+end