Merge branch 'bugfix/captcha-nil-answer_data' into 'develop'

Bugfix: return invalid when answer_data is nil

Closes #1585

See merge request pleroma/pleroma!2236

test/support/captcha_mock.ex

@@ -1,5 +1,5 @@
 # Pleroma: A lightweight social networking server
-# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Captcha.Mock do
@@ -7,8 +7,17 @@ defmodule Pleroma.Captcha.Mock do
   @behaviour Service
 
   @impl Service
-  def new, do: %{type: :mock}
+  def new,
+    do: %{
+      type: :mock,
+      token: "afa1815e14e29355e6c8f6b143a39fa2",
+      answer_data: "63615261b77f5354fb8c4e4986477555",
+      url: "https://example.org/captcha.png"
+    }
 
   @impl Service
-  def validate(_token, _captcha, _data), do: :ok
+  def validate(_token, captcha, captcha) when not is_nil(captcha), do: :ok
+
+  def validate(_token, captcha, answer),
+    do: {:error, "Invalid CAPTCHA captcha: #{inspect(captcha)} ; answer: #{inspect(answer)}"}
 end