From de0ae47a734895127394b2278a44cab06604d027 Mon Sep 17 00:00:00 2001
From: allan <allan@xfiles.dk>
Date: Mon, 3 Nov 2025 17:02:54 +0100
Subject: [PATCH] extended input validation

---
 dokuwikiinstall | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/dokuwikiinstall b/dokuwikiinstall
index 5e00733..0dbbf9a 100755
--- a/dokuwikiinstall
+++ b/dokuwikiinstall
@@ -70,6 +70,20 @@ if [[ ! "$hostname" =~ ^([a-z0-9]+(-[a-z0-9]+)*\.)+[a-z]{2,}$ ]]; then
     exit 1
 fi
 
+# Prevent accidental overwrite of existing Nginx config
+if [[ -f "/etc/nginx/conf.d/${hostname}.conf" ]]; then
+    printf "\nERROR: A configuration file already exists for %s.\n" "$hostname"
+    printf "Refusing to overwrite existing site.\n\n"
+    exit 1
+fi
+
+# Check for existing references in other Nginx configs
+hostcheck=$(grep -r --exclude="README.md" "$hostname" /etc/nginx/ 2>/dev/null || true)
+if [[ -n "$hostcheck" ]]; then
+    printf "\nFound existing configuration mentioning %s — aborting to avoid collision.\n\n" "$hostname"
+    exit 1
+fi
+
 #
 # Let's go
 #