add ProxyJump function

outlook-bulk-sender/BulkArchiveMailer.Core/TemplateEngine.cs

@@ -0,0 +1,62 @@
+using System;
+using System.Collections.Generic;
+using System.Text.RegularExpressions;
+
+namespace BulkArchiveMailer.Core
+{
+    /// <summary>
+    /// Minimal placeholder substitution for Subject/BodyHtml templates.
+    /// Deliberately simple (no conditionals/loops) - templates are short,
+    /// hand-edited strings, not a general templating language.
+    /// </summary>
+    public static class TemplateEngine
+    {
+        private static readonly Regex PlaceholderPattern = new Regex(@"\{(?<name>[A-Za-z0-9_]+)\}", RegexOptions.Compiled);
+
+        /// <summary>
+        /// Replaces every "{Name}" placeholder with the matching value from
+        /// <paramref name="values"/> (case-insensitive lookup). Unknown
+        /// placeholders are left untouched rather than throwing, so a typo
+        /// in a hand-edited template shows up visibly in the preview
+        /// instead of crashing the scan.
+        /// </summary>
+        public static string Render(string template, IDictionary<string, string> values)
+        {
+            if (string.IsNullOrEmpty(template))
+            {
+                return template ?? string.Empty;
+            }
+
+            return PlaceholderPattern.Replace(template, match =>
+            {
+                var name = match.Groups["name"].Value;
+                foreach (var kvp in values)
+                {
+                    if (string.Equals(kvp.Key, name, StringComparison.OrdinalIgnoreCase))
+                    {
+                        return kvp.Value ?? string.Empty;
+                    }
+                }
+
+                return match.Value; // leave "{Unknown}" as-is
+            });
+        }
+
+        /// <summary>Renders both Subject and BodyHtml of a template for one recipient.</summary>
+        public static MailTemplate Render(MailTemplate template, string login, string email)
+        {
+            var values = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
+            {
+                ["Login"] = login ?? "",
+                ["Email"] = email ?? "",
+                ["Date"] = DateTime.Now.ToString("dd.MM.yyyy"),
+            };
+
+            return new MailTemplate
+            {
+                Subject = Render(template?.Subject ?? "", values),
+                BodyHtml = Render(template?.BodyHtml ?? "", values),
+            };
+        }
+    }
+}