From 2b4d629419f4d9d82d736050e943793b5a778ea9 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Thu, 28 Jul 2022 11:37:34 +0200
Subject: use old ddns key if available

---
 html/db.php          |  7 +++++--
 html/maintenance.php | 15 ++++++++++++---
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/html/db.php b/html/db.php
index 9830c5b..fee5ef6 100644
--- a/html/db.php
+++ b/html/db.php
@@ -36,9 +36,12 @@ class MyDB extends SQLite3 {
       die();
     return $result['state_id'];
   }
-  function add_key($comment) {
+  function add_key($comment, $key = NULL) {
     $stm = $this -> prepare('INSERT INTO keys (key, comment) VALUES (:key, :comment)');
-    $stm -> bindValue('key', bin2hex(random_bytes(64)));
+    if ($key == NULL)
+      $stm -> bindValue('key', bin2hex(random_bytes(64)));
+    else
+      $stm -> bindValue('key', $key);
     $stm -> bindValue('comment', $comment);
     $stm -> execute();
     $key_id = $this -> lastInsertRowID();
diff --git a/html/maintenance.php b/html/maintenance.php
index 39b0724..b45b731 100644
--- a/html/maintenance.php
+++ b/html/maintenance.php
@@ -96,9 +96,18 @@ if (array_key_exists('ddns', $_GET)) {
     ' WHERE keys.comment = ' . "'" . 'ddns' . "'"
   );
   $row = $result -> fetchArray();
-  if (! $row)
-    $key_id = $db -> add_key('ddns');
-  else
+  if (! $row) {
+    unset($key);
+    if (file_exists('/srv/http/vhosts/eckner.net/ddns/colocation-token')) {
+      $key = trim(file_get_contents('/srv/http/vhosts/eckner.net/ddns/colocation-token'));
+      if (strlen($key) != 128)
+        unset($key);
+    }
+    if (isset($key))
+      $key_id = $db -> add_key('ddns', $key);
+    else
+      $key_id = $db -> add_key('ddns');
+  } else
     $key_id = $row['id'];
 
   $stm = $db -> prepare('INSERT INTO permissions (key_id, value_id) VALUES (:key_id, :value_id)');
-- 
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