Feature: Google oauth

src/Web/Controllers/GoogleController.cs

@@ -0,0 +1,54 @@
+using System.Security.Claims;
+using Google.Apis.Oauth2.v2.Data;
+using Hutopy.Domain.Interfaces;
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.AspNetCore.Authentication.Cookies;
+using Microsoft.AspNetCore.Authentication.Google;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Hutopy.Web.Controllers;
+
+public class GoogleController(
+    IUserService userService) : Controller
+{
+    [HttpGet("/api/google/sign-in")]
+    public async Task SignIn()
+    {
+        await HttpContext.ChallengeAsync(GoogleDefaults.AuthenticationScheme, new AuthenticationProperties
+        {
+            RedirectUri = Url.Action("Callback"),
+        });
+    }
+    
+    public async Task<IActionResult> Callback()
+    {
+        var authenticateResult = await HttpContext.AuthenticateAsync(CookieAuthenticationDefaults.AuthenticationScheme);
+        
+        if (!authenticateResult.Succeeded)
+        {
+            return BadRequest();
+        }
+        
+        var claims = authenticateResult.Principal.Claims.ToList();
+        
+        var userInfo = new Userinfo
+        {
+            Name = claims.FirstOrDefault(c => c.Type == ClaimTypes.Name)?.Value,
+            Email = claims.FirstOrDefault(c => c.Type == ClaimTypes.Email)?.Value,
+            GivenName = claims.FirstOrDefault(c => c.Type == ClaimTypes.GivenName)?.Value,
+            FamilyName = claims.FirstOrDefault(c => c.Type == ClaimTypes.Surname)?.Value
+        };
+        
+        await userService.CreateUserAsync(userInfo); // TODO: Don't create user if already exists
+
+        await HttpContext.SignInAsync(CookieAuthenticationDefaults.AuthenticationScheme, new ClaimsPrincipal(new ClaimsIdentity(new List<Claim>
+        {
+            new(ClaimTypes.Name, userInfo.Name),
+            new(ClaimTypes.Email, userInfo.Email),
+            new(ClaimTypes.GivenName, userInfo.GivenName),
+            new(ClaimTypes.Surname, userInfo.FamilyName)
+        }, CookieAuthenticationDefaults.AuthenticationScheme)));
+        
+        return Redirect("/");
+    }
+}