Add an ability to disabled captcha

config/config.exs

@@ -11,6 +11,7 @@
 config :pleroma, Pleroma.Repo, types: Pleroma.PostgresTypes
 
 config :pleroma, Pleroma.Captcha,
+  enabled: false,
   method: Pleroma.Captcha.Kocaptcha
 
 # Kocaptcha is a very simple captcha service, the source code is here: https://github.com/koto-bank/kocaptcha

lib/pleroma/captcha.ex

@@ -28,6 +28,15 @@ def validate(token, captcha) do
 
   @doc false
   def handle_call(:new, _from, state) do
+    enabled = Pleroma.Config.get([__MODULE__, :enabled])
+
+    if !enabled do
+      {
+        :reply,
+        %{type: :none},
+        state
+      }
+    else
       method = Pleroma.Config.get!([__MODULE__, :method])
 
       case method do
@@ -51,6 +60,7 @@ def handle_call(:new, _from, state) do
           end
       end
     end
+  end
 
   @doc false
   def handle_call({:validate, token, captcha}, _from, state) do

lib/pleroma/web/twitter_api/twitter_api.ex

@@ -137,8 +137,16 @@ def register_user(params) do
       captcha_token: params["captcha_token"]
     }
 
+    captcha_enabled = Pleroma.Config.get([Pleroma.Captcha, :enabled])
+    # true if captcha is disabled or enabled and valid, false otherwise
+    captcha_ok = if !captcha_enabled do
+      true
+    else
+      Pleroma.Captcha.validate(params[:captcha_token], params[:captcha_solution])
+    end
+
     # Captcha invalid
-    if not Pleroma.Captcha.validate(params[:captcha_token], params[:captcha_solution]) do
+    if not captcha_ok do
       # I have no idea how this error handling works
       {:error, %{error: Jason.encode!(%{captcha: ["Invalid CAPTCHA"]})}}
     else