more work on api & rename to Pilz.Net

Pilz.Net.CloudProviders.Nextcloud/Extensions.cs

@@ -0,0 +1,41 @@
+using Pilz.Net.CloudProviders.Nextcloud.OCS;
+using System.Text;
+
+namespace Pilz.Net.CloudProviders.Nextcloud;
+
+public static class Extensions
+{
+    public static string ToBasicAuth(this OcsApiAuthCredentials? credentials)
+    {
+        if (credentials != null)
+        {
+            var creds = $"{credentials?.LoginName}:{credentials?.AppPassword}";
+            var bytes = Encoding.UTF8.GetBytes(creds);
+            return "Basic " + Convert.ToBase64String(bytes);
+        }
+
+        return string.Empty;
+    }
+
+    public static OcsApiAuthCredentials? ToOcsApiAuthCredentials(this NextcloudLogin? login)
+    {
+        if (!string.IsNullOrEmpty(login?.LoginName) && !string.IsNullOrEmpty(login?.AppPassword))
+            return new OcsApiAuthCredentials(login.LoginName, login.AppPassword);
+        return null;
+    }
+
+    public static OcsApiUrlPath FillParameters(this OcsApiUrlPath path, params object?[] @params)
+    {
+        return (OcsApiUrlPath)string.Format(path, @params);
+    }
+
+    public static DateTime UnixTimeMillisecondsToDateTime(this long? value)
+    {
+        return DateTimeOffset.FromUnixTimeMilliseconds(value ?? 0).DateTime;
+    }
+
+    public static long ToUnixTimeMilliseconds(this DateTime value)
+    {
+        return new DateTimeOffset(value).ToUnixTimeMilliseconds();
+    }
+}