introduce altcha/captcha, fixes #4113

Closes #4113

Merge request studip/studip!2965

1 files changed, 39 insertions, 0 deletions

diff --git a/db/migrations/6.0.2_captcha_by_altcha.php b/db/migrations/6.0.2_captcha_by_altcha.php
new file mode 100644
index 0000000..3749c71
--- /dev/null
+++ b/db/migrations/6.0.2_captcha_by_altcha.php
@@ -0,0 +1,39 @@
+<?php
+return new class extends Migration
+{
+    public function description(): string
+    {
+        return 'Creates a config entry for the key used for captchas and '
+             . 'db storage for solved challenges.';
+    }
+
+    protected function up(): void
+    {
+        $query = "INSERT INTO `config` (`field`, `value`, `type`, `range`, `mkdate`, `chdate`, `description`)
+                  VALUES ('CAPTCHA_KEY', '', 'string', 'global', UNIX_TIMESTAMP(), UNIX_TIMESTAMP(), ?)";
+        DBManager::get()->execute($query, [
+            'Speichert den für Captchas verwendeten Schlüssel (Wert leeren, um einen neuen zu generieren)',
+        ]);
+
+        $query = "CREATE TABLE `captcha_challenges` (
+                      `challenge_id` int(11) NOT NULL AUTO_INCREMENT,
+                      `salt` CHAR(32) COLLATE `latin1_bin` NOT NULL,
+                      `number` INT(11) UNSIGNED NOT NULL,
+                      `mkdate` INT(11) UNSIGNED NOT NULL,
+                      PRIMARY KEY (`challenge_id`)                        
+                  )";
+        DBManager::get()->exec($query);
+    }
+
+    protected function down(): void
+    {
+        $query = "DROP TABLE `captcha_challenges`";
+        DBManager::get()->exec($query);
+
+        $query = "DELETE `config`, `config_values`
+                  FROM `config`
+                  LEFT JOIN `config_values` USING (`field`)
+                  WHERE `field` = 'CAPTCHA_KEY'";
+        DBManager::get()->exec($query);
+    }
+};