refactor(backend): refactor project, add database migrations support

backend/app/services/user_service.py

@@ -0,0 +1,73 @@
+import os
+import uuid
+from typing import Optional
+
+from fastapi import Depends, Request
+from fastapi_users import BaseUserManager, FastAPIUsers, UUIDIDMixin
+from fastapi_users.authentication import (
+    AuthenticationBackend,
+    BearerTransport,
+    JWTStrategy,
+)
+from fastapi_users.db import SQLAlchemyUserDatabase
+
+from ..models.user import User
+from ..services.db import get_user_db
+from ..core.queue import enqueue_email
+
+SECRET = os.getenv("SECRET", "CHANGE_ME_SECRET")
+FRONTEND_URL = os.getenv("FRONTEND_URL", "http://localhost:5173")
+BACKEND_URL = os.getenv("BACKEND_URL", "http://localhost:8000")
+
+class UserManager(UUIDIDMixin, BaseUserManager[User, uuid.UUID]):
+    reset_password_token_secret = SECRET
+    verification_token_secret = SECRET
+
+    async def on_after_register(self, user: User, request: Optional[Request] = None):
+        await self.request_verify(user, request)
+
+    async def on_after_forgot_password(
+            self, user: User, token: str, request: Optional[Request] = None
+    ):
+        print(f"User {user.id} has forgot their password. Reset token: {token}")
+
+    async def on_after_request_verify(
+            self, user: User, token: str, request: Optional[Request] = None
+    ):
+        verify_frontend_link = f"{FRONTEND_URL}/verify?token={token}"
+        verify_backend_link = f"{BACKEND_URL}/auth/verify?token={token}"
+        subject = "Ověření účtu"
+        body = (
+            "Ahoj,\n\n"
+            "děkujeme za registraci. Prosíme, ověř svůj účet kliknutím na tento odkaz:\n"
+            f"{verify_frontend_link}\n\n"
+            "Pokud by odkaz nefungoval, můžeš použít i přímý odkaz na backend:\n"
+            f"{verify_backend_link}\n\n"
+            "Pokud jsi registraci neprováděl(a), tento email ignoruj.\n"
+        )
+        try:
+            enqueue_email(to=user.email, subject=subject, body=body)
+        except Exception:
+            print("[Email Fallback] To:", user.email)
+            print("[Email Fallback] Subject:", subject)
+            print("[Email Fallback] Body:\n", body)
+
+async def get_user_manager(user_db: SQLAlchemyUserDatabase = Depends(get_user_db)):
+    yield UserManager(user_db)
+
+bearer_transport = BearerTransport(tokenUrl="auth/jwt/login")
+
+def get_jwt_strategy() -> JWTStrategy:
+    return JWTStrategy(secret=SECRET, lifetime_seconds=3600)
+
+auth_backend = AuthenticationBackend(
+    name="jwt",
+    transport=bearer_transport,
+    get_strategy=get_jwt_strategy,
+)
+
+fastapi_users = FastAPIUsers[User, uuid.UUID](get_user_manager, [auth_backend])
+
+current_active_user = fastapi_users.current_user(active=True)
+current_active_verified_user = fastapi_users.current_user(active=True, verified=True)
+