backend/app.py

@@ -2,13 +2,12 @@ import asyncio
 from collections.abc import AsyncGenerator
 from contextlib import asynccontextmanager
 
-from fastapi import FastAPI, status
+from fastapi import FastAPI, HTTPException, Request
 
 import settings
-from trading_journal import db
+from trading_journal import db, service
-from trading_journal.dto import TradeCreate, TradeRead
+from trading_journal.db import Database
-
+from trading_journal.dto import UserCreate, UserRead
-API_BASE = "/api/v1"
 
 _db = db.create_database(settings.settings.database_url)
 
@@ -23,8 +22,31 @@ async def lifespan(app: FastAPI) -> AsyncGenerator[None, None]:  # noqa: ARG001
 
 
 app = FastAPI(lifespan=lifespan)
+app.add_middleware(service.AuthMiddleWare)
+app.state.db_factory = _db
 
 
-@app.get(f"{API_BASE}/status")
+@app.get(f"{settings.settings.api_base}/status")
 async def get_status() -> dict[str, str]:
     return {"status": "ok"}
+
+
+@app.post(f"{settings.settings.api_base}/register")
+async def register_user(request: Request, user_in: UserCreate) -> UserRead:
+    db_factory: Database = request.app.state.db_factory
+
+    def sync_work() -> UserRead:
+        with db_factory.get_session_ctx_manager() as db:
+            return service.register_user_service(db, user_in)
+
+    try:
+        return await asyncio.to_thread(sync_work)
+    except service.UserAlreadyExistsError as e:
+        raise HTTPException(status_code=400, detail=str(e)) from e
+    except Exception as e:
+        raise HTTPException(status_code=500, detail="Internal server error" + str(e)) from e
+
+
+@app.get(f"{settings.settings.api_base}/trades")
+async def get_trades() -> dict[str, str]:
+    return {"trades": []}

backend/settings.py

@@ -15,6 +15,7 @@ class Settings(BaseSettings):
     workers: int = 1
     log_level: str = "info"
     database_url: str = "sqlite:///:memory:"
+    api_base: str = "/api/v1"
     hmac_key: str | None = None
 
     model_config = ConfigDict(env_file=".env", env_file_encoding="utf-8")

backend/tests/test_app.py

@@ -3,7 +3,8 @@ from collections.abc import Generator
 import pytest
 from fastapi.testclient import TestClient
 
-from app import API_BASE, app
+import settings
+from app import app
 
 
 @pytest.fixture
@@ -13,6 +14,6 @@ def client() -> Generator[TestClient, None, None]:
 
 
 def test_get_status(client: TestClient) -> None:
-    response = client.get(f"{API_BASE}/status")
+    response = client.get(f"{settings.settings.api_base}/status")
     assert response.status_code == 200
     assert response.json() == {"status": "ok"}

backend/tests/test_crud.py

@@ -651,6 +651,22 @@ def test_create_user(session: Session) -> None:
     assert actual_user.password_hash == user_data["password_hash"]
 
 
+def test_get_user_by_id(session: Session) -> None:
+    user_id = make_user(session, username="fetchuser")
+    user = crud.get_user_by_id(session, user_id)
+    assert user is not None
+    assert user.id == user_id
+    assert user.username == "fetchuser"
+
+
+def test_get_user_by_username(session: Session) -> None:
+    username = "uniqueuser"
+    make_user(session, username=username)
+    user = crud.get_user_by_username(session, username)
+    assert user is not None
+    assert user.username == username
+
+
 def test_update_user(session: Session) -> None:
     user_id = make_user(session, username="updatableuser")
 
@@ -716,6 +732,16 @@ def test_get_login_session_by_token_and_user_id(session: Session) -> None:
     assert fetched_session.session_token_hash == created_session.session_token_hash
 
 
+def test_get_login_session_by_token(session: Session) -> None:
+    now = datetime.now(timezone.utc)
+    created_session = make_login_session(session, now)
+    fetched_session = crud.get_login_session_by_token_hash(session, created_session.session_token_hash)
+    assert fetched_session is not None
+    assert fetched_session.id == created_session.id
+    assert fetched_session.user_id == created_session.user_id
+    assert fetched_session.session_token_hash == created_session.session_token_hash
+
+
 def test_update_login_session(session: Session) -> None:
     now = datetime.now(timezone.utc)
     created_session = make_login_session(session, now)

backend/trading_journal/crud.py

@@ -349,6 +349,17 @@ def create_user(session: Session, user_data: Mapping) -> models.Users:
     return u
 
 
+def get_user_by_id(session: Session, user_id: int) -> models.Users | None:
+    return session.get(models.Users, user_id)
+
+
+def get_user_by_username(session: Session, username: str) -> models.Users | None:
+    statement = select(models.Users).where(
+        models.Users.username == username,
+    )
+    return session.exec(statement).first()
+
+
 def update_user(session: Session, user_id: int, update_data: Mapping) -> models.Users:
     user: models.Users | None = session.get(models.Users, user_id)
     if user is None:
@@ -418,6 +429,15 @@ def get_login_session_by_token_hash_and_user_id(session: Session, session_token_
     return session.exec(statement).first()
 
 
+def get_login_session_by_token_hash(session: Session, session_token_hash: str) -> models.Sessions | None:
+    statement = select(models.Sessions).where(
+        models.Sessions.session_token_hash == session_token_hash,
+        models.Sessions.expires_at > datetime.now(timezone.utc),
+    )
+
+    return session.exec(statement).first()
+
+
 IMMUTABLE_SESSION_FIELDS = {"id", "user_id", "session_token_hash", "created_at"}
 
 

backend/trading_journal/db.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import logging
+from contextlib import contextmanager
 from typing import TYPE_CHECKING
 
 from sqlalchemy import event
@@ -72,6 +73,18 @@ class Database:
         finally:
             session.close()
 
+    @contextmanager
+    def get_session_ctx_manager(self) -> Session:
+        session = Session(self._engine)
+        try:
+            yield session
+            session.commit()
+        except Exception:
+            session.rollback()
+            raise
+        finally:
+            session.close()
+
     def dispose(self) -> None:
         self._engine.dispose()
 

backend/trading_journal/service.py

@@ -0,0 +1,72 @@
+from typing import Callable
+
+from fastapi import Request, Response, status
+from fastapi.responses import JSONResponse
+from sqlmodel import Session
+from starlette.middleware.base import BaseHTTPMiddleware
+
+import settings
+from trading_journal import crud, security
+from trading_journal.db import Database
+from trading_journal.dto import UserCreate, UserRead
+from trading_journal.models import Sessions
+
+EXCEPT_PATHS = [
+    f"{settings.settings.api_base}/status",
+    f"{settings.settings.api_base}/register",
+]
+
+
+class AuthMiddleWare(BaseHTTPMiddleware):
+    async def dispatch(self, request: Request, call_next: Callable[[Request], Response]) -> Response:
+        if request.url.path in EXCEPT_PATHS:
+            return await call_next(request)
+
+        token = request.cookies.get("session_token")
+        if not token:
+            auth_header = request.headers.get("Authorization")
+            if auth_header and auth_header.startswith("Bearer "):
+                token = auth_header[len("Bearer ") :]
+
+        if not token:
+            return JSONResponse(
+                status_code=status.HTTP_401_UNAUTHORIZED,
+                content={"detail": "Unauthorized"},
+            )
+
+        db_factory: Database | None = getattr(request.app.state, "db_factory", None)
+        if db_factory is None:
+            return JSONResponse(status_code=status.HTTP_500_INTERNAL_SERVER_ERROR, content={"detail": "db factory not configured"})
+        try:
+            with db_factory.get_session_ctx_manager() as request_session:
+                hashed_token = security.hash_session_token_sha256(token)
+                request.state.db_session = request_session
+                login_session: Sessions | None = crud.get_login_session_by_token_hash(request.state.db_session, hashed_token)
+        except Exception:  # noqa: BLE001
+            return JSONResponse(status_code=status.HTTP_500_INTERNAL_SERVER_ERROR, content={"detail": "db error"})
+
+        return None
+
+
+class ServiceError(Exception):
+    pass
+
+
+class UserAlreadyExistsError(ServiceError):
+    pass
+
+
+def register_user_service(db_session: Session, user_in: UserCreate) -> UserRead:
+    if crud.get_user_by_username(db_session, user_in.username):
+        raise UserAlreadyExistsError("username already exists")
+    hashed = security.hash_password(user_in.password)
+    try:
+        user = crud.create_user(db_session, username=user_in.username, hashed_password=hashed)
+        try:
+            # prefer pydantic's from_orm if DTO supports orm_mode
+            user = UserRead.model_validate(user)
+        except Exception as e:
+            raise ServiceError("Failed to convert user to UserRead") from e
+    except Exception as e:
+        raise ServiceError("Failed to create user") from e
+    return user