Added additional addresses and attachments to core's email sending service. (#10178)

src/Umbraco.Infrastructure/Extensions/EmailMessageExtensions.cs

@@ -0,0 +1,82 @@
+using System;
+using MimeKit;
+using MimeKit.Text;
+using Umbraco.Cms.Core.Models;
+
+namespace Umbraco.Cms.Infrastructure.Extensions
+{
+    internal static class EmailMessageExtensions
+    {
+        public static MimeMessage ToMimeMessage(this EmailMessage mailMessage, string configuredFromAddress)
+        {
+            var fromEmail = mailMessage.From;
+            if (string.IsNullOrEmpty(fromEmail))
+            {
+                fromEmail = configuredFromAddress;
+            }
+
+            if (!InternetAddress.TryParse(mailMessage.From, out InternetAddress fromAddress))
+            {
+                throw new ArgumentException($"Email could not be sent.  Could not parse from address {fromEmail} as a valid email address.");
+            }
+
+            var messageToSend = new MimeMessage
+            {
+                From = { fromAddress },
+                Subject = mailMessage.Subject,
+            };
+
+            AddAddresses(messageToSend, mailMessage.To, x => x.To, throwIfNoneValid: true);
+            AddAddresses(messageToSend, mailMessage.Cc, x => x.Cc);
+            AddAddresses(messageToSend, mailMessage.Bcc, x => x.Bcc);
+            AddAddresses(messageToSend, mailMessage.ReplyTo, x => x.ReplyTo);
+
+            if (mailMessage.HasAttachments)
+            {
+                var builder = new BodyBuilder();
+                if (mailMessage.IsBodyHtml)
+                {
+                    builder.HtmlBody = mailMessage.Body;
+                }
+                else
+                {
+                    builder.TextBody = mailMessage.Body;
+                }
+
+                foreach (EmailMessageAttachment attachment in mailMessage.Attachments)
+                {
+                    builder.Attachments.Add(attachment.FileName, attachment.Stream);
+                }
+
+                messageToSend.Body = builder.ToMessageBody();
+            }
+            else
+            {
+                messageToSend.Body = new TextPart(mailMessage.IsBodyHtml ? TextFormat.Html : TextFormat.Plain) { Text = mailMessage.Body };
+            }
+
+            return messageToSend;
+        }
+
+        private static void AddAddresses(MimeMessage message, string[] addresses, Func<MimeMessage, InternetAddressList> addressListGetter, bool throwIfNoneValid = false)
+        {
+            var foundValid = false;
+            if (addresses != null)
+            {
+                foreach (var address in addresses)
+                {
+                    if (InternetAddress.TryParse(address, out InternetAddress internetAddress))
+                    {
+                        addressListGetter(message).Add(internetAddress);
+                        foundValid = true;
+                    }
+                }
+            }
+
+            if (throwIfNoneValid && foundValid == false)
+            {
+                throw new InvalidOperationException($"Email could not be sent. Could not parse a valid recipient address.");
+            }
+        }
+    }
+}