Bring back spell.roundcube.net as integrated spelling service but dis…

…able by default (#8182)

This partially reverts commit 92757f5.

config/defaults.inc.php

@@ -909,25 +909,28 @@
 // if in your system 0 quota means no limit set this option to true
 $config['quota_zero_as_unlimited'] = false;
 
-// Make use of the built-in spell checker. It is based on GoogieSpell.
+// Make use of the built-in spell checker.
 $config['enable_spellcheck'] = false;
 
 // Enables spellchecker exceptions dictionary.
 // Setting it to 'shared' will make the dictionary shared by all users.
 $config['spellcheck_dictionary'] = false;
 
 // Set the spell checking engine. Possible values:
-// - 'googie' - requires 'spellcheck_uri' option to be set (also used for connecting to Nox Spell Server)
+// - 'googie' - the default (also used for connecting to Nox Spell Server, see 'spellcheck_uri' setting)
 // - 'pspell' - requires the PHP Pspell module and aspell installed
 // - 'enchant' - requires the PHP Enchant module
 // - 'atd' - install your own After the Deadline server or check with the people at http://www.afterthedeadline.com before using their API
+// Since Google shut down their public spell checking service, the default settings
+// connect to http://spell.roundcube.net which is a hosted service provided by Roundcube.
 // You can connect to any other googie-compliant service by setting 'spellcheck_uri' accordingly.
 $config['spellcheck_engine'] = 'googie';
 
 // For locally installed Nox Spell Server or After the Deadline services,
 // please specify the URI to call it.
-// Get Nox Spell Server from https://github.com/handwritingio/nox_spell_server or
-// the After the Deadline package from http://www.afterthedeadline.com
+// Get Nox Spell Server from http://orangoo.com/labs/?page_id=72 or
+// the After the Deadline package from http://www.afterthedeadline.com.
+// Leave empty to use the public API of service.afterthedeadline.com
 $config['spellcheck_uri'] = '';
 
 // These languages can be selected for spell checking.

program/lib/Roundcube/spellchecker/googie.php

@@ -26,6 +26,8 @@
  */
 class rcube_spellchecker_googie extends rcube_spellchecker_engine
 {
+ const GOOGIE_HOST = 'https://spell.roundcube.net';
+
  private $matches = [];
  private $content;
 
@@ -67,15 +69,11 @@ function check($text)
  // spell check uri is configured
  $url = $rcube->config->get('spellcheck_uri');
 
- if (empty($url)) {
- $this->error = "Missing 'spellcheck_uri' config option";
- return $matches;
- }
- if (strpos($url, '%s') !== false) {
- $url = sprintf($url, $this->lang);
- } else {
- $url .= $this->lang;
+ if (!$url) {
+ $url = self::GOOGIE_HOST . '/tbproxy/spell?lang=';
  }
+ $url .= $this->lang;
+ $url .= sprintf('&key=%06d', !empty($_SESSION['user_id']) ? $_SESSION['user_id'] : 0);
 
  $gtext = '<?xml version="1.0" encoding="utf-8" ?>'
  .'<spellrequest textalreadyclipped="0" ignoredups="0" ignoredigits="1" ignoreallcaps="1">'