From 0ec89acb7ecc43e7543fa73088084af915ef86ed Mon Sep 17 00:00:00 2001
From: Joey Schulze <joey@infodrom.org>
Date: Sun, 16 Aug 2020 21:05:36 +0200
Subject: [PATCH 1/2] Add simple spambot barrier

---
 lib/layout.inc         | 8 +++++---
 templates/contact.html | 6 ++++++
 templates/contact.js   | 6 ++++++
 3 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/lib/layout.inc b/lib/layout.inc
index c8e9d55..6959c19 100644
--- a/lib/layout.inc
+++ b/lib/layout.inc
@@ -420,11 +420,13 @@ function process_contact()
 {
   if ($_SERVER['REQUEST_METHOD'] == 'POST') {
     if (empty($_POST['topic']))
-      $ret = warning('Sie haben keinen Titel für die Nachricht angegeben!');
+      return warning('Sie haben keinen Titel für die Nachricht angegeben!');
     elseif (empty($_POST['body']))
-      $ret = warning('Sie haben keinen Text der Nachricht angegeben!');
+      return warning('Sie haben keinen Text der Nachricht angegeben!');
     elseif (!empty($_POST['email']) && !is_valid_email_address($_POST['email']))
-      $ret = warning('Die angegebene Mail-Adresse ist ungültig.');
+      return warning('Die angegebene Mail-Adresse ist ungültig.');
+    elseif (intval($_POST['pivot']) != intval(date('m')))
+      return warning('Die Testfrage ist falsch beantwortet.');
     else {
       contact_send($_POST['topic'], $_POST['email'], $_POST['body']);
       $ret = information('Die Nachricht wurde an den Chef geschickt.');
diff --git a/templates/contact.html b/templates/contact.html
index a0bcd30..8c897e7 100644
--- a/templates/contact.html
+++ b/templates/contact.html
@@ -32,6 +32,12 @@ textarea {
 <td align="left"><textarea name="body" id="body" tabindex="5">@body@</textarea></td>
 </tr>
 
+<tr>
+<td class="font" align="right" valign="top"><label for="pivot">Testfrage:</label></td>
+<td align="left">Den wievielten Tag im Monat haben wir?<br>
+<input type="text" name="pivot" id="pivot" tabindex="4" value="" size="65" /></td>
+</tr>
+
 </table>
 
 <input class="button" type="submit" tabindex="6" value="Abschicken" onclick="return check_contactform();">
diff --git a/templates/contact.js b/templates/contact.js
index 8eeaee5..f8c5d42 100644
--- a/templates/contact.js
+++ b/templates/contact.js
@@ -3,6 +3,7 @@ function check_contactform()
   var topic = document.getElementById('topic');
   var body = document.getElementById('body');
   var email = document.getElementById('email');
+  var pivot = document.getElementById('pivot');
 
   if (!topic || !body)
     return false;
@@ -17,6 +18,11 @@ function check_contactform()
       return false;
   }
 
+  if (pivot.value.length == 0) {
+      alert('Beantworten Sie bitte die Testfrage!');
+      return false;
+  }
+
   if (email.value.length > 0 && !zlist_valid_email(email.value)) {
       alert('Die angegebene Mail-Adresse ist ungültig.');
       return false;
-- 
2.20.1


From e235e29d60c59a217def6b15658886b1def4e6f9 Mon Sep 17 00:00:00 2001
From: Joey Schulze <joey@infodrom.org>
Date: Wed, 6 Sep 2023 08:48:14 +0200
Subject: [PATCH 2/2] Add some bots

---
 lib/core.inc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/core.inc b/lib/core.inc
index 6d6be04..45e25e9 100644
--- a/lib/core.inc
+++ b/lib/core.inc
@@ -234,6 +234,12 @@ function is_spider()
 			 'ExtLinksBot/',
 			 'Barkrowler/',
 			 'adscanner/',
+			 'PetalBot;',
+			 'SEOkicks;',
+			 'SemrushBot-BA;',
+			 'Dataprovider.com',
+			 'GPTBot/',
+			 'Applebot/',
 			 'Cityreview Robot');
 
   foreach ($known_spiders as $spider_id) {
-- 
2.20.1