add email signup flow

backend/app/Email/EmailConfirmationToken/UseCases/CreateEmailConfirmationToken.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace App\Email\EmailConfirmationToken\UseCases;
+
+use App\Auth\Clock;
+use App\Auth\TokenGenerator;
+use App\Email\EmailConfirmationToken\CreateEmailConfirmationTokenDto;
+use App\Email\EmailConfirmationToken\EmailConfirmationToken;
+use App\Email\EmailConfirmationToken\EmailConfirmationTokenRepository;
+use App\Exceptions\BadRequestException;
+
+class CreateEmailConfirmationToken
+{
+    public function __construct(
+        private EmailConfirmationTokenRepository $tokenRepository,
+        private Clock $clock,
+        private TokenGenerator $tokenGenerator,
+    ) {}
+
+    /**
+     * @throws BadRequestException
+     */
+    public function execute(
+        CreateEmailConfirmationTokenRequest $request,
+    ): EmailConfirmationToken {
+        if ($request->user === null) {
+            throw new BadRequestException('user is required');
+        }
+        if ($request->minuteOffset === null) {
+            throw new BadRequestException('minuteOffset is required');
+        }
+
+        $existingToken = $this->tokenRepository->findByUser($request->user);
+        if ($existingToken !== null) {
+            $this->tokenRepository->delete($existingToken->getId());
+        }
+
+        return $this->tokenRepository->create(
+            new CreateEmailConfirmationTokenDto(
+                user: $request->user,
+                availableTo: $this->clock->now()->modify(
+                    "+{$request->minuteOffset} minutes",
+                ),
+                token: $this->tokenGenerator->generate(),
+            ),
+        );
+    }
+}