From bcb8b413110331de70fea47a4149936ec42a5bf9 Mon Sep 17 00:00:00 2001
From: Hinton <hinton@users.noreply.github.com>
Date: Thu, 5 Jun 2025 09:44:57 +0200
Subject: [PATCH] Implement handlebar logic

---
 .../Registration/VerifyEmail/VerifyEmail.cs   | 21 ++++++--
 src/Core/Core.csproj                          |  6 ++-
 src/Core/Platform/Services/IMailer.cs         |  2 +-
 src/Core/Platform/Services/Mailer.cs          | 52 +++++++++++++++++--
 test/Core.Test/Platform/MailerTest.cs         | 23 ++++++++
 5 files changed, 95 insertions(+), 9 deletions(-)
 create mode 100644 test/Core.Test/Platform/MailerTest.cs

diff --git a/src/Core/Auth/UserFeatures/Registration/VerifyEmail/VerifyEmail.cs b/src/Core/Auth/UserFeatures/Registration/VerifyEmail/VerifyEmail.cs
index 81e5e69aeb..8f9417df43 100644
--- a/src/Core/Auth/UserFeatures/Registration/VerifyEmail/VerifyEmail.cs
+++ b/src/Core/Auth/UserFeatures/Registration/VerifyEmail/VerifyEmail.cs
@@ -1,9 +1,24 @@
-using Bit.Core.Platform.Services;
+using System.Net;
+using Bit.Core.Platform.Services;
 
 namespace Bit.Core.Auth.UserFeatures.Registration.VerifyEmail;
 
-public class VerifyEmail(string url) : BaseMailModel2
+public class VerifyEmail() : BaseMailModel2
 {
     public override string Subject { get; set; } = "Verify Your Email";
-    public string Url { get; } = url;
+
+    public required string Token { get; init; }
+    public required string Email { get; init; }
+    public required string WebVaultUrl { get; init; }
+
+    public string Url
+    {
+        get => string.Format(
+            "{0}/redirect-connector.html#finish-signup?token={1}&email={2}&fromEmail=true",
+            WebVaultUrl,
+            WebUtility.UrlEncode(Token),
+            WebUtility.UrlEncode(Email)
+        );
+    }
+
 }
diff --git a/src/Core/Core.csproj b/src/Core/Core.csproj
index 88ecaf8cef..7dcf3a2d88 100644
--- a/src/Core/Core.csproj
+++ b/src/Core/Core.csproj
@@ -16,7 +16,9 @@
   <ItemGroup>
     <EmbeddedResource Include="licensing.cer" />
     <EmbeddedResource Include="licensing_dev.cer" />
-    <EmbeddedResource Include="MailTemplates\Handlebars\**\*.hbs" />
+
+    <!-- Email templates uses .hbs extension, they must be included for emails to work -->
+    <EmbeddedResource Include="**\*.hbs" />
   </ItemGroup>
 
   <ItemGroup>
@@ -70,7 +72,7 @@
     <PackageReference Include="System.Text.Json" Version="8.0.5" />
     <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="8.0.1" />
   </ItemGroup>
-  
+
   <ItemGroup>
     <Folder Include="Resources\" />
     <Folder Include="Properties\" />
diff --git a/src/Core/Platform/Services/IMailer.cs b/src/Core/Platform/Services/IMailer.cs
index c14d9d6f56..acb410871d 100644
--- a/src/Core/Platform/Services/IMailer.cs
+++ b/src/Core/Platform/Services/IMailer.cs
@@ -12,7 +12,7 @@ public interface IMailer
     /// </summary>
     /// <param name="message"></param>
     /// <param name="recipient">Recipient email</param>
-    public void SendEmail(BaseMailModel2 message, string recipient);
+    public Task SendEmail(BaseMailModel2 message, string recipient);
 
     /// <summary>
     /// Sends multiple emails message to the specified recipients.
diff --git a/src/Core/Platform/Services/Mailer.cs b/src/Core/Platform/Services/Mailer.cs
index 8167fc1fe6..c1e5a49baa 100644
--- a/src/Core/Platform/Services/Mailer.cs
+++ b/src/Core/Platform/Services/Mailer.cs
@@ -1,11 +1,57 @@
-namespace Bit.Core.Platform.Services;
+using System.Reflection;
+using HandlebarsDotNet;
+
+namespace Bit.Core.Platform.Services;
 
 #nullable enable
 
-
 public class Mailer : IMailer
 {
-    public void SendEmail(BaseMailModel2 message, string recipient) => throw new NotImplementedException();
+    public IHandlebars H { get; set; }
+
+    public Mailer()
+    {
+        H = Handlebars.Create();
+    }
+
+
+    public async Task SendEmail(BaseMailModel2 message, string recipient)
+    {
+        var htmlTemplate = await ReadTemplateAsync(message, "html");
+        var textTemplate = await ReadTemplateAsync(message, "txt");
+
+
+        var assembly = typeof(Mailer).Assembly;
+        var basicHtmlLayoutSource = await ReadSourceAsync(assembly, "Bit.Core.MailTemplates.Handlebars.Layouts.Full.html.hbs");
+        H.RegisterTemplate("FullHtmlLayout", basicHtmlLayoutSource);
+
+        var t = H.Compile(htmlTemplate);
+        var tmp = t(message);
+
+        Console.WriteLine(tmp);
+    }
 
     public void SendEmails(BaseMailModel2 message, string[] recipients) => throw new NotImplementedException();
+
+
+    private static async Task<string?> ReadTemplateAsync(BaseMailModel2 message, string suffix)
+    {
+        var assembly = message.GetType().Assembly;
+        var qualifiedName = message.GetType().FullName;
+        var template = $"{qualifiedName}.{suffix}.hbs";
+
+        return await ReadSourceAsync(assembly, template);
+    }
+
+    private static async Task<string?> ReadSourceAsync(Assembly assembly, string template)
+    {
+        if (assembly.GetManifestResourceNames().All(f => f != template))
+        {
+            return null;
+        }
+
+        await using var s = assembly.GetManifestResourceStream(template)!;
+        using var sr = new StreamReader(s);
+        return await sr.ReadToEndAsync();
+    }
 }
diff --git a/test/Core.Test/Platform/MailerTest.cs b/test/Core.Test/Platform/MailerTest.cs
new file mode 100644
index 0000000000..732e858931
--- /dev/null
+++ b/test/Core.Test/Platform/MailerTest.cs
@@ -0,0 +1,23 @@
+using Bit.Core.Auth.UserFeatures.Registration.VerifyEmail;
+using Bit.Core.Platform.Services;
+using Xunit;
+
+namespace Bit.Core.Test.Platform;
+
+public class MailerTest
+{
+    [Fact]
+    public async Task SendEmailAsync()
+    {
+        var mailer = new Mailer();
+
+        var mail = new VerifyEmail
+        {
+            Token = "test-token",
+            Email = "test@bitwarden.com",
+            WebVaultUrl = "https://vault.bitwarden.com"
+        };
+
+        await mailer.SendEmail(mail, "test@bitwarden.com");
+    }
+}