feat: add test button to create channel form using ad-hoc smtp test endpoint

- Add TestSmtpCommand and TestSmtpHandler for ad-hoc smtp testing without saving - Add POST /admin/channels/test-smtp endpoint accepting raw smtp settings - Show Test button on both Create and Edit forms - Test reads current form values so channel can be tested before saving
2026-05-02 19:53:20 +03:00
parent 3e1cc696c1
commit 6302a07178
4 changed files with 164 additions and 68 deletions
@@ -0,0 +1,18 @@
+using HrynCo.NotificationService.Services.Core;
+using MediatR;
+
+namespace HrynCo.NotificationService.Services.EmailChannels.TestSmtp;
+
+/// <summary>
+/// Sends a test email using the provided SMTP settings without persisting anything.
+/// </summary>
+public sealed record TestSmtpCommand(
+    string Host,
+    int Port,
+    string Username,
+    string Password,
+    bool UseSsl,
+    string FromEmail,
+    string FromName,
+    string ToEmail
+) : IRequest<ServiceResult<Core.Unit>>;
@@ -0,0 +1,52 @@
+using System.Net;
+using System.Net.Mail;
+using HrynCo.NotificationService.DAL.Abstract;
+using HrynCo.NotificationService.Services.Core;
+using HrynCo.NotificationService.Services.Logging;
+using static HrynCo.NotificationService.Services.Core.ServiceResultHelper;
+
+namespace HrynCo.NotificationService.Services.EmailChannels.TestSmtp;
+
+internal sealed class TestSmtpHandler
+    : RequestHandler<TestSmtpCommand, ServiceResult<Unit>>
+{
+    public TestSmtpHandler(
+        IContextualSerilogLogger<TestSmtpCommand> logger,
+        IUnitOfWork unitOfWork)
+        : base(logger, unitOfWork)
+    {
+    }
+
+    protected override async Task<ServiceResult<Unit>> DoOnHandle(
+        TestSmtpCommand request, CancellationToken cancellationToken)
+    {
+        try
+        {
+            using var client = new SmtpClient(request.Host, request.Port)
+            {
+                EnableSsl = request.UseSsl,
+                Credentials = string.IsNullOrWhiteSpace(request.Username)
+                    ? null
+                    : new NetworkCredential(request.Username, request.Password)
+            };
+
+            using var mail = new MailMessage
+            {
+                From = new MailAddress(request.FromEmail, request.FromName),
+                Subject = "✅ Test email from Notification Service",
+                Body = "<p>This is a test email sent from the <b>Notification Service</b> admin panel to verify the channel settings.</p>",
+                IsBodyHtml = true
+            };
+            mail.To.Add(new MailAddress(request.ToEmail));
+
+            await client.SendMailAsync(mail, cancellationToken);
+        }
+        catch (Exception ex)
+        {
+            Logger.Error(ex, "Ad-hoc SMTP test failed for host {Host}", request.Host);
+            return Failure<Unit>(ex.Message);
+        }
+
+        return Success(Unit.Value);
+    }
+}