Side Nav Redesign (#2310)

Kavita.Common/Helpers/UrlHelper.cs

@@ -0,0 +1,41 @@
+namespace Kavita.Common.Helpers;
+
+#nullable enable
+public static class UrlHelper
+{
+    public static bool StartsWithHttpOrHttps(string? url)
+    {
+        if (string.IsNullOrEmpty(url)) return false;
+        return url.StartsWith("http://") || url.StartsWith("https://");
+    }
+
+    public static string? EnsureStartsWithHttpOrHttps(string? url)
+    {
+        if (string.IsNullOrEmpty(url)) return url;
+        if (!url.StartsWith("http://") && !url.StartsWith("https://"))
+        {
+            // URL doesn't start with "http://" or "https://", so add "http://"
+            return "http://" + url;
+        }
+
+        return url;
+    }
+
+    public static string? EnsureEndsWithSlash(string? url)
+    {
+        if (string.IsNullOrEmpty(url)) return url;
+
+        return !url.EndsWith('/')
+            ? $"{url}/"
+            : url;
+
+    }
+
+    public static string? EnsureStartsWithSlash(string? url)
+    {
+        if (string.IsNullOrEmpty(url)) return url;
+        return !url.StartsWith('/')
+            ? $"/{url}"
+            : url;
+    }
+}