From 52718691d9b0d5162f37443d187fdfe5e79fd765 Mon Sep 17 00:00:00 2001
From: Tim <contact@bytim.eu>
Date: Mon, 29 Dec 2025 00:10:49 +0100
Subject: Validate IP Address and Name when generating link

---
 README.md                                   |  2 +-
 ShareGuard.Web/Components/Pages/Admin.razor | 26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 6a5f4bb..deb8fdc 100644
--- a/README.md
+++ b/README.md
@@ -4,5 +4,5 @@
 
 ## TODOs
 - [ ] Admin interface: Protect with OAuth
-- [ ] Admin interface: validation of IP Address(es)
+- [x] Admin interface: validation of IP Address(es)
 - [ ] Admin interface: Show link and qr code after gernerating
diff --git a/ShareGuard.Web/Components/Pages/Admin.razor b/ShareGuard.Web/Components/Pages/Admin.razor
index 3884630..1eab4f6 100644
--- a/ShareGuard.Web/Components/Pages/Admin.razor
+++ b/ShareGuard.Web/Components/Pages/Admin.razor
@@ -1,9 +1,15 @@
 @page "/admin/"
+@using System.Text.RegularExpressions
 @using ShareGuard.Web.DbModels
 @rendermode InteractiveServer
 
 <PageTitle>ShareGuard Admin</PageTitle>
 
+@if (_error != null)
+{
+    <div class="padding error-container">@_error</div>
+}
+
 <h2>ShareGuard Admin</h2>
 
 <h5>Generate Share-Link</h5>
@@ -74,6 +80,7 @@
 @code
 {
     private const string TemplateFilePath = "./wg-quick-template.txt";
+    private string? _error;
     private string? _template;
 
     private void SaveTemplate()
@@ -96,8 +103,26 @@
     private string _newName = "";
     private string _newIpAddress = "";
 
+    private bool IpInputIsValid(string input)
+    {
+        var ipRegex = new Regex("([0-9a-fA-F:.]+\\/[0-9]{1,3}(, ?)?)+");
+        return ipRegex.IsMatch(input);
+    }
+    
     private void GenerateNewLink()
     {
+        if (!IpInputIsValid(_newIpAddress))
+        {
+            _error = "IP input is not valid.";
+            return;
+        }
+
+        if (string.IsNullOrEmpty(_newName))
+        {
+            _error = "Name input is not valid.";
+            return;
+        }
+        
         using var db = new Database();
         db.Links.Add(new Link
         {
@@ -106,6 +131,7 @@
             Token = Link.GenerateToken(db)
         });
         db.SaveChanges();
+        _error = null;
         OnInitialized();
     }
 
-- 
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