Implement mail service with configuration and settings management

.gitignore

@@ -7,3 +7,4 @@ riderModule.iml
 Publish/
 app.db
 FoodsharingSiegen.Server/wwwroot/buildinfo.txt
+FoodsharingSiegen.Server/config/appsettings.json

Docker/.env

@@ -0,0 +1,7 @@
+MAIL_HOST=smtp.example.com
+MAIL_PORT=587
+MAIL_USERNAME=your_username
+MAIL_PASSWORD=your_password
+MAIL_FROM_ADDRESS=noreply@example.com
+MAIL_FROM_NAME="FS Einarbeitungen Musterhausen"
+MAIL_USE_SSL=true

Docker/docker-compose.yml

@@ -5,6 +5,17 @@ services:
     image: ghcr.io/troogs/fs-onboarding/server:latest
     ports:
       - "8100:56000"
+    env_file:
+      - .env
+    environment:
+      # Mail Configuration Examples. These override options in appsettings.json.
+      # All values below can also be set via the active .env file or appsettings.json.
+      - Settings__Mail__Host=${MAIL_HOST:-smtp.example.com}
+      - Settings__Mail__Port=${MAIL_PORT:-587}
+      - Settings__Mail__Username=${MAIL_USERNAME:-your_username}
+      - Settings__Mail__Password=${MAIL_PASSWORD:-your_password}
+      - Settings__Mail__FromAddress=${MAIL_FROM_ADDRESS:-no-reply@example.com}
+      - Settings__Mail__UseSsl=${MAIL_USE_SSL:-true}
     volumes:
       - /docker/data/fs-onboarding/config:/app/config/
       - /docker/data/fs-onboarding/data:/app/data/

FoodsharingSiegen.Contracts/Model/AppSettings.cs

@@ -6,6 +6,11 @@
 
         public bool DisableStepIn { get; set; }
 
+        /// <summary>
+        /// Gets or sets the mail server settings.
+        /// </summary>
+        public MailSettings Mail { get; set; } = new();
+
         public TermSettings Terms { get; set; } = new();
 
         public bool TestMode { get; set; }

FoodsharingSiegen.Contracts/Model/MailSettings.cs

@@ -0,0 +1,38 @@
+namespace FoodsharingSiegen.Contracts.Model
+{
+    /// <summary>
+    /// Configuration settings for the mail service.
+    /// </summary>
+    public class MailSettings
+    {
+        /// <summary>
+        /// Gets or sets the SMTP server host.
+        /// </summary>
+        public string Host { get; set; } = string.Empty;
+
+        /// <summary>
+        /// Gets or sets the SMTP port.
+        /// </summary>
+        public int Port { get; set; } = 587;
+
+        /// <summary>
+        /// Gets or sets the username for SMTP authentication.
+        /// </summary>
+        public string Username { get; set; } = string.Empty;
+
+        /// <summary>
+        /// Gets or sets the password for SMTP authentication.
+        /// </summary>
+        public string Password { get; set; } = string.Empty;
+
+        /// <summary>
+        /// Gets or sets the sender address.
+        /// </summary>
+        public string FromAddress { get; set; } = string.Empty;
+
+        /// <summary>
+        /// Gets or sets whether to use SSL/TLS connection.
+        /// </summary>
+        public bool UseSsl { get; set; } = true;
+    }
+}

FoodsharingSiegen.Server/FoodsharingSiegen.Server.csproj

@@ -29,6 +29,7 @@
     
     <ItemGroup>
       <PackageReference Include="LibSassBuilder" Version="2.0.1" />
+      <PackageReference Include="MailKit" Version="4.4.0" />
       <PackageReference Include="Microsoft.EntityFrameworkCore" Version="9.0.3" />
       <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="9.0.3">
         <PrivateAssets>all</PrivateAssets>

FoodsharingSiegen.Server/Pages/Settings.razor

@@ -0,0 +1,30 @@
+@page "/settings"
+
+@inherits FsBase
+
+<PageTitle>Einstellungen - @AppSettings.Terms.Title</PageTitle>
+
+<div style="width: 100%; max-width: 500px;">
+    <h2>Einstellungen</h2>
+
+    <div class="card mt-3">
+        <div class="card-header" style="padding: .5rem 0 0 1rem;"><h5>Mail Service</h5></div>
+        <div class="card-body">
+            <p>
+                <strong>SMTP Server:</strong> @AppSettings.Mail.Host<br />
+                <strong>Port:</strong> @AppSettings.Mail.Port<br />
+                <strong>SSL:</strong> @(AppSettings.Mail.UseSsl ? "Ja" : "Nein")<br />
+            </p>
+            <hr />
+            <Fields Class="my-3">
+                <Field ColumnSize="ColumnSize.Is12">
+                    <FieldLabel>Testmail-Empfänger</FieldLabel>
+                    <FieldBody>
+                        <TextEdit @bind-Text="TestMailReceiver" Placeholder="E-Mail Adresse"></TextEdit>
+                    </FieldBody>
+                </Field>
+            </Fields>
+            <Button Color="Color.Primary" Clicked="SendTestMail">Testmail senden</Button>
+        </div>
+    </div>
+</div>

FoodsharingSiegen.Server/Pages/Settings.razor.cs

@@ -0,0 +1,45 @@
+using FoodsharingSiegen.Contracts.Helper;
+using FoodsharingSiegen.Server.Service;
+using Microsoft.AspNetCore.Components;
+using System;
+using System.Threading.Tasks;
+
+namespace FoodsharingSiegen.Server.Pages
+{
+    public partial class Settings
+    {
+        [Inject]
+        public IMailService MailService { get; set; } = null!;
+
+        private string TestMailReceiver { get; set; } = string.Empty;
+
+        protected override async Task InitializeDataAsync()
+        {
+            if (!CurrentUser.IsAdmin())
+            {
+                NavigationManager.NavigateTo("/");
+                return;
+            }
+            await Task.CompletedTask;
+        }
+
+        private async Task SendTestMail()
+        {
+            if (string.IsNullOrWhiteSpace(TestMailReceiver))
+            {
+                await Notification.Error("Bitte eine Empfänger-Adresse angeben.");
+                return;
+            }
+
+            try
+            {
+                await MailService.SendEmailAsync(TestMailReceiver, "Testmail", "Dies ist eine Testmail.");
+                await Notification.Success("Testmail versendet.");
+            }
+            catch (Exception ex)
+            {
+                await Notification.Error($"Fehler beim Senden: {ex.Message}");
+            }
+        }
+    }
+}

FoodsharingSiegen.Server/Program.cs

@@ -29,6 +29,7 @@ builder.Services.AddScoped<AuditService>();
 builder.Services.AddScoped<AuthService>();
 builder.Services.AddScoped<UserService>();
 builder.Services.AddScoped<ProspectService>();
+builder.Services.AddScoped<IMailService, MailService>();
 
 builder.Services
     .AddBlazorise()

FoodsharingSiegen.Server/Service/IMailService.cs

@@ -0,0 +1,19 @@
+using System.Threading.Tasks;
+
+namespace FoodsharingSiegen.Server.Service
+{
+    /// <summary>
+    /// Service interface for sending emails.
+    /// </summary>
+    public interface IMailService
+    {
+        /// <summary>
+        /// Sends an email asynchronously.
+        /// </summary>
+        /// <param name="toEmail">The recipient's email address.</param>
+        /// <param name="subject">The subject of the email.</param>
+        /// <param name="htmlBody">The HTML content of the email body.</param>
+        /// <returns>A task that represents the asynchronous email sending operation.</returns>
+        Task SendEmailAsync(string toEmail, string subject, string htmlBody);
+    }
+}

FoodsharingSiegen.Server/Service/MailService.cs

@@ -0,0 +1,57 @@
+using System.Threading.Tasks;
+using FoodsharingSiegen.Contracts.Model;
+using MailKit.Net.Smtp;
+using MailKit.Security;
+using Microsoft.Extensions.Options;
+using MimeKit;
+using MimeKit.Text;
+
+namespace FoodsharingSiegen.Server.Service
+{
+    /// <summary>
+    /// Default implementation of <see cref="IMailService"/> which sends emails via SMTP using MailKit.
+    /// </summary>
+    public class MailService : IMailService
+    {
+        private readonly MailSettings _mailSettings;
+        private readonly TermSettings _termSettings;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="MailService"/> class.
+        /// </summary>
+        /// <param name="appSettings">The configured application settings injected by DI, containing the <see cref="MailSettings"/>.</param>
+        public MailService(IOptions<AppSettings> appSettings)
+        {
+            _mailSettings = appSettings.Value.Mail;
+            _termSettings = appSettings.Value.Terms;
+        }
+
+        /// <inheritdoc/>
+        public async Task SendEmailAsync(string toEmail, string subject, string htmlBody)
+        {
+            var email = new MimeMessage();
+            email.From.Add(new MailboxAddress(_termSettings.Title, _mailSettings.FromAddress));
+            email.To.Add(MailboxAddress.Parse(toEmail));
+            email.Subject = subject;
+            
+            var textPart = new TextPart(TextFormat.Html) 
+            { 
+                Text = htmlBody 
+            };
+            email.Body = textPart;
+
+            using var smtp = new SmtpClient();
+            var secureOptions = _mailSettings.UseSsl ? SecureSocketOptions.StartTls : SecureSocketOptions.Auto;
+            
+            await smtp.ConnectAsync(_mailSettings.Host, _mailSettings.Port, secureOptions);
+            
+            if (!string.IsNullOrWhiteSpace(_mailSettings.Username))
+            {
+                await smtp.AuthenticateAsync(_mailSettings.Username, _mailSettings.Password);
+            }
+            
+            await smtp.SendAsync(email);
+            await smtp.DisconnectAsync(true);
+        }
+    }
+}

FoodsharingSiegen.Server/Shared/NavMenu.razor

@@ -49,13 +49,21 @@
 
     @if (CurrentUser.IsAdmin())
     {
-        <div class="nav-item px-3 pb-0">
+        <div class="nav-item px-3">
             <div @onclick="NavLinkClickedAsync">
                 <NavLink class="nav-link" href="users" Match="NavLinkMatch.All">
                     <span class="fas fa-users mr-2" aria-hidden="true" style="font-size: 1.4em;"></span> Benutzer
                 </NavLink>
             </div>
         </div>
+
+        <div class="nav-item px-3 pb-0">
+            <div @onclick="NavLinkClickedAsync">
+                <NavLink class="nav-link" href="settings" Match="NavLinkMatch.All">
+                    <span class="fas fa-cog mr-2" aria-hidden="true" style="font-size: 1.4em;"></span> Einstellungen
+                </NavLink>
+            </div>
+        </div>
     }
 
     <div class="nav-item px-3">

FoodsharingSiegen.Server/config/appsettings.example.json

@@ -1,4 +1,4 @@
-{
+{
   "Kestrel": {
     "Endpoints": {
       "Http": {
@@ -9,10 +9,18 @@
   "DetailedErrors": true,
   "Settings": {
     "TestMode": true,
+    "Mail": {
+      "Host": "mail.example.com",
+      "Port": 587,
+      "Username": "your_username",
+      "Password": "your_password",
+      "FromAddress": "no-reply@example.com",
+      "UseSsl": true
+    },
     "Terms": {
       "Title": "Foodsharing Musterhausen",
       "TitleShort": "Musterhausen",
-      "StepInName": "Krabbelgruppe2"
+      "StepInName": "Neulingstreffen"
     }
   }
 }