Utils: Add SendEmail()

Elwig/Helpers/Utils.cs

@@ -21,6 +21,9 @@ using MailKit.Security;
 using Microsoft.EntityFrameworkCore;
 using System.Reflection;
 using System.Collections;
+using Elwig.Documents;
+using MimeKit;
+using System.Windows.Input;
 
 namespace Elwig.Helpers {
     public static partial class Utils {
@@ -438,6 +441,40 @@ namespace Elwig.Helpers {
             return client;
         }
 
+        public static async Task<bool> SendEmail(Member member, string subject, string text, IEnumerable<Document> docs) {
+            if (App.Config.Smtp == null)
+                return false;
+
+            SmtpClient? client = null;
+            try {
+                Mouse.OverrideCursor = Cursors.AppStarting;
+                client = await GetSmtpClient();
+
+                using var msg = new MimeMessage();
+                msg.From.Add(new MailboxAddress(App.Client.NameFull, App.Config.Smtp.Value.From));
+                msg.To.AddRange(member.EmailAddresses.OrderBy(a => a.Nr).Select(a => new MailboxAddress(member.AdministrativeName, a.Address)));
+                msg.Subject = subject;
+                var body = new Multipart("mixed") {
+                    new TextPart("plain") { Text = text }
+                };
+                foreach (var doc in docs) {
+                    var name = NormalizeFileName(doc.Title);
+                    body.Add(doc.AsEmailAttachment($"{name}.pdf"));
+                }
+                msg.Body = body;
+                await client!.SendAsync(msg);
+            } catch (Exception exc) {
+                MessageBox.Show(exc.Message, "Fehler", MessageBoxButton.OK, MessageBoxImage.Error);
+                return false;
+            } finally {
+                if (client != null)
+                    await client.DisconnectAsync(true);
+                client?.Dispose();
+                Mouse.OverrideCursor = null;
+            }
+            return true;
+        }
+
         public static int? GetEntityIdentifier(object? obj) {
             if (obj == null) {
                 return null;