From 5b68e1d9ebba303a6d31eefd82860385198c73d3 Mon Sep 17 00:00:00 2001
From: Mia Winter <mia@miawinter.de>
Date: Thu, 18 Jan 2024 15:24:58 +0100
Subject: [PATCH] Implemented SmtpEmailSender for Identity

---
 Wave/Data/SmtpConfiguration.cs   | 11 +++++++
 Wave/Program.cs                  | 10 ++++--
 Wave/Services/SmtpEmailSender.cs | 55 ++++++++++++++++++++++++++++++++
 Wave/Wave.csproj                 |  1 +
 4 files changed, 75 insertions(+), 2 deletions(-)
 create mode 100644 Wave/Data/SmtpConfiguration.cs
 create mode 100644 Wave/Services/SmtpEmailSender.cs

diff --git a/Wave/Data/SmtpConfiguration.cs b/Wave/Data/SmtpConfiguration.cs
new file mode 100644
index 0000000..f4359a5
--- /dev/null
+++ b/Wave/Data/SmtpConfiguration.cs
@@ -0,0 +1,11 @@
+namespace Wave.Data;
+
+public class SmtpConfiguration {
+    public required string Host { get; init; } 
+    public required int Port { get; init; } 
+    public required string Username { get; init; } 
+    public required string Password { get; init; } 
+    public required string SenderEmail { get; init; }
+    public required string SenderName { get; init; }
+    public bool Ssl { get; init; } = true;  
+}
\ No newline at end of file
diff --git a/Wave/Program.cs b/Wave/Program.cs
index 111efd1..2573293 100644
--- a/Wave/Program.cs
+++ b/Wave/Program.cs
@@ -59,8 +59,6 @@
     .AddDefaultTokenProviders()
     .AddClaimsPrincipalFactory<UserClaimsFactory>();
 
-builder.Services.AddSingleton<IEmailSender<ApplicationUser>, IdentityNoOpEmailSender>();
-
 #endregion
 
 #region Services
@@ -74,6 +72,14 @@
 builder.Services.AddCascadingValue("TitlePrefix", 
     sf => (sf.GetService<IOptions<Customization>>()?.Value.AppName ?? "Wave") + " - ");
 
+var smtpConfig = builder.Configuration.GetSection("Email:Smtp");
+if (smtpConfig.Exists()) {
+    builder.Services.Configure<SmtpConfiguration>(smtpConfig);
+    builder.Services.AddScoped<IEmailSender<ApplicationUser>, SmtpEmailSender>();
+} else {
+    builder.Services.AddSingleton<IEmailSender<ApplicationUser>, IdentityNoOpEmailSender>();
+}
+
 #endregion
 
 var app = builder.Build();
diff --git a/Wave/Services/SmtpEmailSender.cs b/Wave/Services/SmtpEmailSender.cs
new file mode 100644
index 0000000..d8dd0c5
--- /dev/null
+++ b/Wave/Services/SmtpEmailSender.cs
@@ -0,0 +1,55 @@
+using MailKit.Net.Smtp;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Identity.UI.Services;
+using Microsoft.Extensions.Options;
+using MimeKit;
+using Wave.Data;
+
+namespace Wave.Services;
+
+public class SmtpEmailSender(IOptions<SmtpConfiguration> config, ILogger<SmtpEmailSender> logger) : IEmailSender<ApplicationUser>, IEmailSender {
+    private SmtpConfiguration Configuration { get; } = config.Value;
+    private ILogger<SmtpEmailSender> Logger { get; } = logger;
+    
+    public Task SendConfirmationLinkAsync(ApplicationUser user, string email, string confirmationLink) =>
+        SendEmailAsync(email, "Confirm your email",
+            $"Please confirm your account by <a href='{confirmationLink}'>clicking here</a>.");
+
+    public Task SendPasswordResetLinkAsync(ApplicationUser user, string email, string resetLink) =>
+        SendEmailAsync(email, "Reset your password",
+            $"Please reset your password by <a href='{resetLink}'>clicking here</a>.");
+
+    public Task SendPasswordResetCodeAsync(ApplicationUser user, string email, string resetCode) =>
+        SendEmailAsync(email, "Reset your password",
+            $"Please reset your password using the following code: {resetCode}");
+
+
+    public Task SendEmailAsync(string email, string subject, string htmlMessage) {
+        return SendEmailAsync(email, null, subject, htmlMessage);
+    }
+
+    public async Task SendEmailAsync(string email, string? name, string subject, string htmlMessage) {
+        try {
+            var message = new MimeMessage {
+                From = {new MailboxAddress(Configuration.SenderName, Configuration.SenderEmail)},
+                To = { new MailboxAddress(name, email) },
+                Subject = subject
+            };
+
+            var builder = new BodyBuilder {
+                HtmlBody = htmlMessage
+            };
+
+            message.Body = builder.ToMessageBody();
+
+            using var client = new SmtpClient();
+            await client.ConnectAsync(Configuration.Host, Configuration.Port);
+            await client.AuthenticateAsync(Configuration.Username, Configuration.Password);
+            await client.SendAsync(message);
+            await client.DisconnectAsync(true);
+        } catch (Exception ex) {
+            Logger.LogError(ex, "Error sending E-Mail");
+            throw;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Wave/Wave.csproj b/Wave/Wave.csproj
index b367c58..d7e4208 100644
--- a/Wave/Wave.csproj
+++ b/Wave/Wave.csproj
@@ -14,6 +14,7 @@
     <PackageReference Include="Humanizer.Core.de" Version="2.14.1" />
     <PackageReference Include="Humanizer.Core.uk" Version="2.14.1" />
     <PackageReference Include="Magick.NET-Q8-AnyCPU" Version="13.5.0" />
+    <PackageReference Include="MailKit" Version="4.3.0" />
     <PackageReference Include="Markdig" Version="0.34.0" />
     <PackageReference Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="8.0.0" />
     <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="8.0.0" />