initial

Kemkas.Web/Services/Identity/ICurrentUserService.cs

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+using Kemkas.Web.Db.Models;
+using Microsoft.AspNetCore.Identity;
+
+namespace Kemkas.Web.Services.Identity;
+
+public interface ICurrentUserService
+{
+    public Task<ApplicationUser?> GetCurrentUser();
+
+    public Task<ApplicationUser> GetCurrentUserOrThrow();
+}
+
+public class CurrentUserService(
+    IHttpContextAccessor httpContextAccessor,
+    UserManager<ApplicationUser> userManager
+    ) : ICurrentUserService
+{
+    private ApplicationUser? _user;
+    
+    public async Task<ApplicationUser?> GetCurrentUser()
+    {
+        if (_user is not null)
+        {
+            return _user;
+        }
+
+        var userName = httpContextAccessor.HttpContext?.User.Identity?.Name;
+        if (userName is null)
+        {
+            return null;
+        }
+
+        _user = await userManager.FindByNameAsync(userName);
+        return _user;
+    }
+
+    public async Task<ApplicationUser> GetCurrentUserOrThrow()
+    {
+        return await GetCurrentUser() ?? throw new InvalidOperationException("no current user!");
+    }
+}

Kemkas.Web/Services/Identity/MailgunEmailSender.cs

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+using System.Net.Http.Headers;
+using Kemkas.Web.Config;
+using Microsoft.AspNetCore.Identity.UI.Services;
+using Microsoft.Extensions.Options;
+
+namespace Kemkas.Web.Services.Identity;
+
+public class MailgunEmailSender(IOptions<MailgunOptions> sendGridOptions, HttpClient httpClient) : IEmailSender
+{
+    public async Task SendEmailAsync(string email, string subject, string htmlMessage)
+    {
+        var domain = sendGridOptions.Value.DomainName;
+        var uri = new Uri($"https://api.eu.mailgun.net/v3/{domain}/messages");
+        var request = new HttpRequestMessage(HttpMethod.Post, uri);
+        var authHeaderValue = Convert.ToBase64String(System.Text.Encoding.ASCII.GetBytes($"api:{sendGridOptions.Value.ApiKey}"));
+        request.Headers.Authorization = new AuthenticationHeaderValue("Basic", authHeaderValue);
+
+        request.Content = new FormUrlEncodedContent(
+        [
+            new KeyValuePair<string,string>("from", $"no-reply@{domain}"),
+            new KeyValuePair<string,string>("to", email),
+            new KeyValuePair<string,string>("subject", subject),
+            new KeyValuePair<string,string>("html", htmlMessage),
+        ]);
+        
+        var response = await httpClient.SendAsync(request);
+        response.EnsureSuccessStatusCode();
+    }
+}