[Core] Add IMailService.SendBusinessUnitConversionInviteAsync

src/Core/MailTemplates/Handlebars/Billing/BusinessUnitConversionInvite.html.hbs

@@ -0,0 +1,19 @@
+{{#>FullHtmlLayout}}
+    <table width="100%" cellpadding="0" cellspacing="0" style="margin: 0; box-sizing: border-box; color: #333; line-height: 25px; -webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none;">
+        <tr style="margin: 0; box-sizing: border-box; color: #333; line-height: 25px; -webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none;">
+            <td class="content-block" style="font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; box-sizing: border-box; font-size: 16px; color: #333; line-height: 25px; margin: 0; -webkit-font-smoothing: antialiased; padding: 0 0 10px; -webkit-text-size-adjust: none; text-align: left;" valign="top" align="center">
+                You have been invited to set up a new Business Unit Portal within Bitwarden.
+                <br style="margin: 0; box-sizing: border-box; color: #333; line-height: 25px; -webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none;" />
+                <br style="margin: 0; box-sizing: border-box; color: #333; line-height: 25px; -webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none;" />
+            </td>
+        </tr>
+        <tr style="margin: 0; box-sizing: border-box; color: #333; line-height: 25px; -webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none;">
+            <td class="content-block" style="font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; box-sizing: border-box; font-size: 16px; color: #333; line-height: 25px; margin: 0; -webkit-font-smoothing: antialiased; padding: 0 0 10px; -webkit-text-size-adjust: none; text-align: center;" valign="top" align="center">
+                <a href="{{{Url}}}" clicktracking=off target="_blank" style="color: #ffffff; text-decoration: none; text-align: center; cursor: pointer; display: inline-block; border-radius: 5px; background-color: #175DDC; border-color: #175DDC; border-style: solid; border-width: 10px 20px; margin: 0; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; box-sizing: border-box; font-size: 16px; line-height: 25px; -webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none;">
+                    Set Up Business Unit Portal Now
+                </a>
+                <br style="margin: 0; box-sizing: border-box; color: #333; line-height: 25px; -webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none;" />
+            </td>
+        </tr>
+    </table>
+{{/FullHtmlLayout}}

src/Core/MailTemplates/Handlebars/Billing/BusinessUnitConversionInvite.text.hbs

@@ -0,0 +1,5 @@
+{{#>BasicTextLayout}}
+    You have been invited to set up a new Business Unit Portal within Bitwarden. To continue, click the following link:
+
+    {{{Url}}}
+{{/BasicTextLayout}}

src/Core/Models/Mail/Billing/BusinessUnitConversionInviteModel.cs

@@ -0,0 +1,11 @@
+namespace Bit.Core.Models.Mail.Billing;
+
+public class BusinessUnitConversionInviteModel : BaseMailModel
+{
+    public string OrganizationId { get; set; }
+    public string Email { get; set; }
+    public string Token { get; set; }
+
+    public string Url =>
+        $"{WebVaultUrl}/providers/setup-business-unit?organizationId={OrganizationId}&email={Email}&token={Token}";
+}

src/Core/Services/IMailService.cs

@@ -70,6 +70,7 @@ public interface IMailService
     Task SendEnqueuedMailMessageAsync(IMailQueueMessage queueMessage);
     Task SendAdminResetPasswordEmailAsync(string email, string userName, string orgName);
     Task SendProviderSetupInviteEmailAsync(Provider provider, string token, string email);
+    Task SendBusinessUnitConversionInviteAsync(Organization organization, string token, string email);
     Task SendProviderInviteEmailAsync(string providerName, ProviderUser providerUser, string token, string email);
     Task SendProviderConfirmedEmailAsync(string providerName, string email);
     Task SendProviderUserRemoved(string providerName, string email);

src/Core/Services/Implementations/HandlebarsMailService.cs

@@ -11,6 +11,7 @@ using Bit.Core.Billing.Models.Mail;
 using Bit.Core.Entities;
 using Bit.Core.Models.Data.Organizations;
 using Bit.Core.Models.Mail;
+using Bit.Core.Models.Mail.Billing;
 using Bit.Core.Models.Mail.FamiliesForEnterprise;
 using Bit.Core.Models.Mail.Provider;
 using Bit.Core.SecretsManager.Models.Mail;
@@ -951,6 +952,22 @@ public class HandlebarsMailService : IMailService
         await _mailDeliveryService.SendEmailAsync(message);
     }
 
+    public async Task SendBusinessUnitConversionInviteAsync(Organization organization, string token, string email)
+    {
+        var message = CreateDefaultMessage("Set Up Business Unit", email);
+        var model = new BusinessUnitConversionInviteModel
+        {
+            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
+            SiteName = _globalSettings.SiteName,
+            OrganizationId = organization.Id.ToString(),
+            Email = WebUtility.UrlEncode(email),
+            Token = WebUtility.UrlEncode(token)
+        };
+        await AddMessageContentAsync(message, "Billing.BusinessUnitConversionInvite", model);
+        message.Category = "BusinessUnitConversionInvite";
+        await _mailDeliveryService.SendEmailAsync(message);
+    }
+
     public async Task SendProviderInviteEmailAsync(string providerName, ProviderUser providerUser, string token, string email)
     {
         var message = CreateDefaultMessage($"Join {providerName}", email);

src/Core/Services/NoopImplementations/NoopMailService.cs

@@ -212,6 +212,11 @@ public class NoopMailService : IMailService
         return Task.FromResult(0);
     }
 
+    public Task SendBusinessUnitConversionInviteAsync(Organization organization, string token, string email)
+    {
+        return Task.FromResult(0);
+    }
+
     public Task SendProviderInviteEmailAsync(string providerName, ProviderUser providerUser, string token, string email)
     {
         return Task.FromResult(0);