feat(backend): start authentication controllers

Foxnouns.Backend/Controllers/Authentication/EmailAuthController.cs

@@ -0,0 +1,31 @@
+using Foxnouns.Backend.Database;
+using Foxnouns.Backend.Services;
+using Microsoft.AspNetCore.Mvc;
+using NodaTime;
+
+namespace Foxnouns.Backend.Controllers.Authentication;
+
+[Route("/api/v2/auth/email")]
+public class EmailAuthController(DatabaseContext db, AuthService authSvc, UserRendererService userRendererSvc, IClock clock, ILogger logger) : ApiControllerBase
+{
+    [HttpPost("login")]
+    public async Task<IActionResult> LoginAsync([FromBody] LoginRequest req)
+    {
+        var user = await authSvc.AuthenticateUserAsync(req.Email, req.Password);
+        var frontendApp = await db.GetFrontendApplicationAsync();
+        
+        var (tokenStr, token) =
+            authSvc.GenerateToken(user, frontendApp, ["*"], clock.GetCurrentInstant() + Duration.FromDays(365));
+        db.Add(token);
+
+        await db.SaveChangesAsync();
+
+        return Ok(new AuthController.AuthResponse(
+            await userRendererSvc.RenderUserAsync(user, selfUser: user, renderMembers: false),
+            tokenStr,
+            token.ExpiresAt
+        ));
+    }
+
+    public record LoginRequest(string Email, string Password);
+}