[ticket/12960] Add incomplete captcha to prevent registration

PHPBB3-12960

phpBB/config/default/container/services_captcha.yml

@@ -17,6 +17,11 @@ services:
     core.captcha.plugins.incomplete:
         class: phpbb\captcha\plugins\incomplete
         shared: false
+        arguments:
+            - '@config'
+            - '@template'
+            - '%core.root_path%'
+            - '%core.php_ext%'
         calls:
             - [ set_name, [ core.captcha.plugins.incomplete ] ]
         tags:

phpBB/language/en/ucp.php

@@ -136,6 +136,7 @@ $lang = array_merge($lang, array(
 	'CONFIRMATION'				=> 'Confirmation of registration',
 	'CONFIRM_CHANGES'			=> 'Confirm changes',
 	'CONFIRM_EXPLAIN'			=> 'To prevent automated registrations the board requires you to enter a confirmation code. The code is displayed in the image you should see below. If you are visually impaired or cannot otherwise read this code please contact the %sBoard Administrator%s.',
+	'CONFIRM_INCOMPLETE'		=> 'To prevent automated registrations the board requires you to enter a confirmation code. This has not been configured yet and hence cannot be used. Please try again later or contact the %sBoard Administrator%s.',
 	'VC_REFRESH'				=> 'Refresh confirmation code',
 	'VC_REFRESH_EXPLAIN'		=> 'If you cannot read the code you can request a new one by clicking the button.',
 

phpBB/phpbb/captcha/plugins/incomplete.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace phpbb\captcha\plugins;
+
+use phpbb\config\config;
+use phpbb\template\template;
+
+class incomplete extends \phpbb\captcha\plugins\captcha_abstract
+{
+	public function __construct(protected config $config, protected template $template,
+								protected string $phpbb_root_path, protected string $phpEx)
+	{}
+
+	public function is_available()
+	{
+		return true;
+	}
+
+	public function get_generator_class()
+	{
+	}
+
+	public static function get_name()
+	{
+		return 'CAPTCHA_INCOMPLETE';
+	}
+
+	public function init($type)
+	{
+	}
+
+	public function execute_demo()
+	{
+	}
+
+	public function execute()
+	{
+	}
+
+	public function get_demo_template($id)
+	{
+		return '';
+	}
+
+	public function get_template()
+	{
+		$contact_link = phpbb_get_board_contact_link($this->config, $this->phpbb_root_path, $this->phpEx);
+
+		$this->template->assign_vars([
+			'CONFIRM_LANG'	=> $this->type != CONFIRM_POST ? 'CONFIRM_INCOMPLETE' : 'POST_CONFIRM_INCOMPLETE',
+			'CONTACT_LINK'	=> $contact_link,
+		]);
+
+		return 'captcha_incomplete.html';
+	}
+
+	public function validate()
+	{
+		return false;
+	}
+
+	public function is_solved()
+	{
+		return false;
+	}
+}

phpBB/styles/prosilver/template/captcha_incomplete.html

@@ -0,0 +1,7 @@
+<div class="panel captcha-panel">
+	<div class="inner">
+
+	<h3 class="captcha-title">{{ lang('CONFIRMATION') }}</h3>
+	<p class="error">{{ lang(CONFIRM_LANG, '<a href="' ~ CONTACT_LINK ~ '">', '</a>') }}</p>
+	</div>
+</div>