From 78b7b059eabfeac2f4e517083192f8549cd0a2a6 Mon Sep 17 00:00:00 2001
From: Gary Sharp <garypsharp@hotmail.com>
Date: Thu, 16 May 2024 22:11:10 +1000
Subject: [PATCH] feature: expression helpers - basic email sending

---
 Disco.Models/Services/Messaging/Email.cs      |  2 +-
 .../Services/Messaging/EmailAttachment.cs     |  1 +
 Disco.Services/Expressions/Expression.cs      |  8 ++++-
 .../Expressions/Extensions/EmailExt.cs        | 32 +++++++++++++++++++
 Disco.Services/Messaging/EmailService.cs      |  6 ++++
 5 files changed, 47 insertions(+), 2 deletions(-)
 create mode 100644 Disco.Services/Expressions/Extensions/EmailExt.cs

diff --git a/Disco.Models/Services/Messaging/Email.cs b/Disco.Models/Services/Messaging/Email.cs
index e12ad07c..55f973a7 100644
--- a/Disco.Models/Services/Messaging/Email.cs
+++ b/Disco.Models/Services/Messaging/Email.cs
@@ -25,7 +25,7 @@ namespace Disco.Models.Services.Messaging
         public Email(string to, string subject, string body)
             : this()
         {
-            To.Add(to);
+            To.AddRange(ParseEmailAddresses(to));
             Subject = subject;
             Body = body;
         }
diff --git a/Disco.Models/Services/Messaging/EmailAttachment.cs b/Disco.Models/Services/Messaging/EmailAttachment.cs
index 1e69234a..2294c078 100644
--- a/Disco.Models/Services/Messaging/EmailAttachment.cs
+++ b/Disco.Models/Services/Messaging/EmailAttachment.cs
@@ -4,5 +4,6 @@
     {
         public string Name { get; set; }
         public byte[] Data { get; set; }
+        public string MediaType { get; set; }
     }
 }
diff --git a/Disco.Services/Expressions/Expression.cs b/Disco.Services/Expressions/Expression.cs
index 99c958b1..4d7411d6 100644
--- a/Disco.Services/Expressions/Expression.cs
+++ b/Disco.Services/Expressions/Expression.cs
@@ -38,9 +38,10 @@ namespace Disco.Services.Expressions
         public static void InitializeExpressions()
         {
             TypeRegistry.RegisterType("DataExt", typeof(Extensions.DataExt));
-            TypeRegistry.RegisterType("UserExt", typeof(Extensions.UserExt));
             TypeRegistry.RegisterType("DeviceExt", typeof(Extensions.DeviceExt));
+            TypeRegistry.RegisterType("EmailExt", typeof(Extensions.EmailExt));
             TypeRegistry.RegisterType("ImageExt", typeof(Extensions.ImageExt));
+            TypeRegistry.RegisterType("UserExt", typeof(Extensions.UserExt));
         }
 
         public T EvaluateFirst<T>(object ExpressionContext, IDictionary Variables)
@@ -297,6 +298,11 @@ namespace Disco.Services.Expressions
                     typeof(Extensions.DeviceExt).AssemblyQualifiedName
                 },
 
+                {
+                    "EmailExt",
+                    typeof(Extensions.EmailExt).AssemblyQualifiedName
+                },
+
                 {
                     "ImageExt",
                     typeof(Extensions.ImageExt).AssemblyQualifiedName
diff --git a/Disco.Services/Expressions/Extensions/EmailExt.cs b/Disco.Services/Expressions/Extensions/EmailExt.cs
new file mode 100644
index 00000000..9b4780ce
--- /dev/null
+++ b/Disco.Services/Expressions/Extensions/EmailExt.cs
@@ -0,0 +1,32 @@
+using Disco.Models.Repository;
+using Disco.Models.Services.Messaging;
+using Disco.Services.Messaging;
+using System;
+
+namespace Disco.Services.Expressions.Extensions
+{
+    public static class EmailExt
+    {
+        public static void SendToUser(User user, string subject, string body)
+        {
+            var to = user.EmailAddress;
+
+            if (string.IsNullOrWhiteSpace(to))
+                throw new Exception($"User ({user.UserId}) does not have an email address");
+
+            Send(to, subject, body);
+        }
+
+        public static void Send(string to, string subject, string body)
+        {
+            var email = new Email()
+            {
+                Subject = subject,
+                Body = body,
+            };
+            email.To.Add(to);
+
+            EmailService.SendEmail(email);
+        }
+    }
+}
diff --git a/Disco.Services/Messaging/EmailService.cs b/Disco.Services/Messaging/EmailService.cs
index 86e6ff45..ee8e47ae 100644
--- a/Disco.Services/Messaging/EmailService.cs
+++ b/Disco.Services/Messaging/EmailService.cs
@@ -2,6 +2,7 @@
 using Disco.Data.Repository;
 using Disco.Models.Services.Messaging;
 using System;
+using System.IO;
 using System.Net;
 using System.Net.Mail;
 
@@ -98,6 +99,11 @@ namespace Disco.Services.Messaging
                 foreach (var recipient in email.BCC)
                     message.Bcc.Add(recipient);
             }
+            if (email.Attachments.Count > 0)
+            {
+                foreach (var attachment in email.Attachments)
+                    message.Attachments.Add(new Attachment(new MemoryStream(attachment.Data), attachment.Name, attachment.MediaType));
+            }
 
             using (var smtpClient = new SmtpClient(smtpServer, smtpPort))
             {