From 805ff817b7176a329a65c65fb20b00c02e010ab2 Mon Sep 17 00:00:00 2001
From: Tokk <tokk@tokk.de>
Date: Fri, 12 Jun 2020 21:30:53 +0200
Subject: [PATCH] Mailversand an erlaubte Domains;

---
 .../MultipleChoiceTrainer.csproj              |  1 +
 MultipleChoiceTrainer/Services/EmailSender.cs | 36 +++++++++++++++++--
 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/MultipleChoiceTrainer/MultipleChoiceTrainer.csproj b/MultipleChoiceTrainer/MultipleChoiceTrainer.csproj
index b17333f..60365ef 100644
--- a/MultipleChoiceTrainer/MultipleChoiceTrainer.csproj
+++ b/MultipleChoiceTrainer/MultipleChoiceTrainer.csproj
@@ -6,6 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="MailKit" Version="2.7.0" />
     <PackageReference Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="3.1.5" />
     <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="3.1.5" />
     <PackageReference Include="Microsoft.AspNetCore.Identity.UI" Version="3.1.5" />
diff --git a/MultipleChoiceTrainer/Services/EmailSender.cs b/MultipleChoiceTrainer/Services/EmailSender.cs
index 99ad3a4..7da0997 100644
--- a/MultipleChoiceTrainer/Services/EmailSender.cs
+++ b/MultipleChoiceTrainer/Services/EmailSender.cs
@@ -1,8 +1,11 @@
 using Microsoft.AspNetCore.Identity.UI.Services;
+using MailKit.Net.Smtp;
+using MailKit;
+using MimeKit;
 using System;
 using System.Collections.Generic;
-using System.Linq;
 using System.Threading.Tasks;
+using System.Linq;
 
 namespace MultipleChoiceTrainer.Services
 {
@@ -10,7 +13,36 @@ namespace MultipleChoiceTrainer.Services
     {
         public Task SendEmailAsync(string email, string subject, string htmlMessage)
         {
-            return Task.Run(() => System.Threading.Thread.Sleep(0));
+            var allowedDomains = new List<string>() { "rheaktionen.de", "rhetro.de", "tokk.de", "schertel.info" };
+            if(string.IsNullOrEmpty(email) || !email.Contains("@"))
+            {
+                return Task.Run(() => System.Threading.Thread.Sleep(0));
+            }
+
+            if(!allowedDomains.Any(e => e.ToLower().Equals(email.Split("@").Last().ToLower())))
+            {
+                return Task.Run(() => System.Threading.Thread.Sleep(0));
+            }
+
+            var message = new MimeMessage();
+            message.From.Add(new MailboxAddress("Multiple Choice Traier", "noreply@tokk.de"));  
+            message.To.Add(MailboxAddress.Parse(email));
+            message.Subject = subject;
+
+            message.Body = new TextPart("html")
+            {
+                Text = htmlMessage
+            };
+
+            using (var client = new SmtpClient())
+            {
+                client.Connect("mx1.tokk-management.de", 465, true);
+                client.Authenticate("noreply@tokk.de", "5ue9iN8JgfNqLH3vgrPi");
+
+                client.Send(message);
+
+                return Task.Run(() => System.Threading.Thread.Sleep(0));
+            }
         }
     }
 }