fix: path traversal via URL-encoded ../, Feb 29 leap year crash, missing response_model, dead code, duplicate utcnow

AGENTS.md

@@ -3,7 +3,7 @@
 ## Project overview
 - Full-stack todo app: **Vue 3 + Element Plus** (WebUI/) + **FastAPI + SQLAlchemy** (api/)
 - **Python 3.10+, Node 18+**; SQLite database
-- Single `master` branch, no CI/CD
+- Single `master` branch (4 commits total), no CI/CD
 
 ## Quick commands
 
@@ -39,24 +39,37 @@ python tests/test_accounts.py
 - **Config is hardcoded** in `api/app/config.py` — no `.env`, no `os.getenv()`. Port `23994`, CORS origins `["http://localhost:5173", "http://localhost:23994"]`. Note: `pydantic-settings` is in `requirements.txt` but unused.
 - **SQLite path** is computed relative to `api/` via `__file__` — safe regardless of cwd. `connect_args={"check_same_thread": False}` for FastAPI async compatibility.
 - **`database.py:init_db()`** auto-creates tables on startup (`create_all`) and auto-adds missing columns via `ALTER TABLE ADD COLUMN` (no Alembic). Columns that are non-nullable with no default are skipped.
-- **UserSettings is a singleton**: always id=1, auto-created on first `GET`.
-- **Account balance changes** auto-create `AccountHistory` records in `update_balance()`.
-- **Habit checkins for the same day** accumulate count (not new rows), enforced by a `(habit_id, checkin_date)` unique constraint.
-- **Anniversaries / DebtInstallments** have computed fields (`next_date`, `days_until`, `year_count` / `remaining_periods`) calculated at request time, not stored in DB.
-- **`task_tags` M2M table** is defined in `models/tag.py` (not `models/task.py`).
-- **Update schemas** use `clearable_fields` + `exclude_unset=True` to distinguish "field not sent" from "field sent as null".
-- **JWT authentication** — mandatory for all `/api/*` routes except `/api/auth/*` and `/health`. Default password: `elysia`. Login via `POST /api/auth/login`. Token key in localStorage: `elysia_auth_token`. Frontend axios interceptor auto-attaches `Authorization: Bearer <token>`.
+- **UserSettings is a singleton**: always id=1, auto-created on first `GET`. `set_default_password()` auto-initializes password to `"elysia"` on first access if `password_hash` is empty.
+- **Account balance changes** auto-create `AccountHistory` records in `update_balance()`. You cannot directly modify balance via `PUT /api/accounts/{id}` — balance is replaced via `POST /api/accounts/{id}/balance`.
+- **Habit checkins for the same day** accumulate count (not new rows), enforced by a `(habit_id, checkin_date)` unique constraint. Cancelling reduces count; deleting when count ≤ 0 removes the row.
+- **Anniversaries / DebtInstallments** have computed fields (`next_date`, `days_until`, `year_count` / `remaining_periods`) calculated at request time, not stored in DB. The calculation functions live in the router layer (not models), because they depend on `date.today()`.
+- **`task_tags` M2M table** is defined in `models/tag.py` (not `models/task.py`). Tags only support create/delete (no update).
+- **Update schemas** use `clearable_fields` + `exclude_unset=True` to distinguish "field not sent" from "field sent as null". For non-clearable fields, `None` means "don't change"; for clearable fields, `None` means "clear it". See `schemas/task.py:TaskUpdate`, `schemas/habit.py:HabitUpdate`, `schemas/anniversary.py:AnniversaryUpdate`.
+- **JWT authentication** — `utils/auth.py` handles JWT (HS256, key: `"elysia-todo-secret-key-change-in-production"`, 24h expiry). Middleware in `main.py` validates tokens for all `/api/*` routes except `/api/auth/*` and `/health`. Default password: `elysia`. Login via `POST /api/auth/login`. Token key in localStorage: `elysia_auth_token`. **Middleware only validates the token; it does NOT inject user info into `request.state`.** Routes needing user data must call `get_current_user(request)` manually.
+- **Different cascade delete strategies:**
+  - `Category`: refuses deletion if tasks are linked (400)
+  - `HabitGroup`: sets linked habits' `group_id` to NULL
+  - `AnniversaryCategory`: sets linked anniversaries' `category_id` to NULL
+  - `FinancialAccount`: full cascade delete (removes linked history + installments)
+
+### Router registration quirks
+- **`/health` MUST be registered before `/{full_path:path}`** in `main.py:114` — otherwise SPA fallback intercepts health checks and returns `index.html`.
+- **habits router** (`routers/habits.py`) is an empty-shell router that combines 3 sub-routers via `include_router`: habit-groups (`/api/habit-groups`), habits (`/api/habits`), and checkins (`/api/habits/{habit_id}/checkins`).
+- **anniversaries and accounts routers** BOTH use `prefix="/api"` (not `/api/anniversaries` or `/api/accounts`). Their internal paths are `/anniversaries`, `/anniversary-categories`, `/accounts`, `/debt-installments`, etc. They coexist because internal paths don't overlap — but be careful adding new routes; the first `include_router` match wins.
 
 ### Frontend (`WebUI/`)
 - Vue Router uses `createWebHistory()` (HTML5 history mode) — **requires the backend SPA fallback** (`/{full_path:path}` → `index.html`).
 - Vite dev proxy forwards `/api` → `http://localhost:23994`.
 - `@` alias maps to `src/`.
-- Global styles in SCSS (`src/styles/`).
-- 8 Pinia stores; Element Plus icons registered globally in `main.ts`.
+- 9 Pinia stores: `auth`, `task`, `category`, `tag`, `habit`, `anniversary`, `account`, `userSettings`, `ui`. The `ui` store manages dialog visibility, editing state, sidebar collapse, and global loading (no API calls).
+- Element Plus icons registered globally in `main.ts` — use `<Edit />`, `<Delete />` etc. in templates without imports.
 - Element Plus uses Chinese locale (`zh-cn`).
-
-### Route registration order matters
-The `/health` endpoint must be registered **before** the `/{full_path:path}` SPA fallback catch-all, otherwise `/health` requests return `index.html`. This is enforced in `api/app/main.py:114` — do not reorder these registrations.
+- **Vite 7.x + TypeScript 5.9** with `erasableSyntaxOnly: true` and project references.
+- **Frontend task filtering is entirely client-side.** `fetchTasks()` loads all tasks once; filtering, sorting, and pinyin search run in computed getters. No server-side filtering for tasks.
+- **Pinyin search** via `pinyin-pro` (`utils/pinyin.ts`) — supports Chinese character search by pinyin initials or full pinyin.
+- **Token key `elysia_auth_token` is hardcoded in 3 separate files** (`router/index.ts`, `api/request.ts`, `stores/useAuthStore.ts`). If you rename it, update all 3.
+- **401 response triggers a hard page redirect** (`window.location.href = '/login'`) in the axios interceptor, which reloads the SPA entirely. This differs from the router guard's in-app redirect (`return { path: '/login' }`).
+- `sass` is a runtime `dependency` (not `devDependency`) in `package.json` — intentional.
 
 ### Docker
 - `Dockerfile` copies pre-built `api/webui/` — you must build frontend before `docker build`.
@@ -76,6 +89,6 @@ The `/health` endpoint must be registered **before** the `/{full_path:path}` SPA
 - No database migrations framework (Alembic)
 
 ## Additional notes
-- Swagger UI at `/docs` when backend is running — the live, auto-generated API reference.
+- Swagger UI at `/docs` when backend is running.
 - `python-multipart` in `requirements.txt` is required for FastAPI to parse form data (not optional).
-- `sass` is a runtime `dependency` (not `devDependency`) in `package.json` — unusual, but intentional.
+- `pydantic-settings` is installed but unused — config is hardcoded.

api/app/main.py

@@ -151,9 +151,12 @@ if os.path.exists(WEBUI_PATH):
     @app.get("/{full_path:path}")
     async def spa_fallback(request: Request, full_path: str):
         """SPA 回退：先尝试提供真实文件，找不到则返回 index.html"""
-        file_path = os.path.join(WEBUI_PATH, full_path)
-        if os.path.isfile(file_path):
-            return FileResponse(file_path)
+        # 规范化路径并防止路径穿越攻击
+        safe_path = os.path.normpath(os.path.join(WEBUI_PATH, full_path))
+        if not safe_path.startswith(os.path.normpath(WEBUI_PATH)):
+            return FileResponse(os.path.join(WEBUI_PATH, "index.html"))
+        if os.path.isfile(safe_path):
+            return FileResponse(safe_path)
         return FileResponse(os.path.join(WEBUI_PATH, "index.html"))
 
     logger.info(f"SPA 静态文件服务已配置: {WEBUI_PATH}")

api/app/models/user_settings.py

@@ -1,12 +1,6 @@
 from sqlalchemy import Column, Integer, String, Text, DateTime, Date
-from datetime import datetime, timezone, date
 from app.database import Base
-
-
-def utcnow():
-    """统一获取 UTC 时间的工厂函数"""
-    return datetime.now(timezone.utc)
-
+from app.utils.datetime import utcnow
 
 class UserSettings(Base):
     """用户设置模型（单例，始终只有一条记录 id=1）"""

api/app/routers/accounts.py

@@ -8,7 +8,7 @@ from app.database import get_db
 from app.models.account import FinancialAccount, AccountHistory, DebtInstallment
 from app.schemas.account import (
     AccountCreate, AccountUpdate, AccountResponse, BalanceUpdateRequest,
-    AccountHistoryResponse, AccountListItemResponse,
+    AccountHistoryResponse, AccountListItemResponse, PaginatedAccountHistoryResponse,
     DebtInstallmentCreate, DebtInstallmentUpdate, DebtInstallmentResponse,
 )
 from app.schemas.common import DeleteResponse
@@ -232,7 +232,7 @@ def update_balance(account_id: int, data: BalanceUpdateRequest, db: Session = De
         raise HTTPException(status_code=500, detail="更新余额失败")
 
 
-@router.get("/accounts/{account_id}/history")
+@router.get("/accounts/{account_id}/history", response_model=PaginatedAccountHistoryResponse)
 def get_account_history(
     account_id: int,
     page: int = Query(1, ge=1),
@@ -252,26 +252,13 @@ def get_account_history(
             AccountHistory.created_at.desc()
         ).offset((page - 1) * page_size).limit(page_size).all()
 
-        result = {
+        logger.info(f"获取账户历史成功: account_id={account_id}, total={total}")
+        return {
             "total": total,
             "page": page,
             "page_size": page_size,
-            "records": [
-                {
-                    "id": r.id,
-                    "account_id": r.account_id,
-                    "change_amount": r.change_amount,
-                    "balance_before": r.balance_before,
-                    "balance_after": r.balance_after,
-                    "note": r.note,
-                    "created_at": r.created_at,
-                }
-                for r in records
-            ]
+            "records": records,
         }
-
-        logger.info(f"获取账户历史成功: account_id={account_id}, total={total}")
-        return result
     except HTTPException:
         raise
     except Exception as e:
@@ -287,7 +274,7 @@ def get_installments(db: Session = Depends(get_db)):
     try:
         installments = db.query(DebtInstallment).order_by(
             DebtInstallment.is_completed.asc(),
-            DebtInstallment.next_payment_date.asc() if hasattr(DebtInstallment, 'next_payment_date') else DebtInstallment.id.asc()
+            DebtInstallment.id.asc()
         ).all()
 
         today = date.today()
@@ -390,6 +377,11 @@ def update_installment(installment_id: int, data: DebtInstallmentUpdate, db: Ses
         installment = get_or_404(db, DebtInstallment, installment_id, "分期计划")
         update_data = data.model_dump(exclude_unset=True)
 
+        if "account_id" in update_data:
+            account = get_or_404(db, FinancialAccount, update_data["account_id"], "账户")
+            if account.account_type != "debt":
+                raise HTTPException(status_code=400, detail="分期计划只能关联欠款类型的账户")
+
         for field, value in update_data.items():
             setattr(installment, field, value)
 

api/app/routers/anniversaries.py

@@ -17,6 +17,16 @@ from app.utils.logger import logger
 router = APIRouter(prefix="/api", tags=["纪念日"])
 
 
+def _safe_date(year: int, month: int, day: int) -> date:
+    """安全构造日期，对闰年 2 月 29 日回退到 2 月 28 日"""
+    try:
+        return date(year, month, day)
+    except ValueError:
+        if month == 2 and day == 29:
+            return date(year, 2, 28)
+        raise
+
+
 def compute_next_info(anniversary: Anniversary, today: date) -> tuple:
     """计算纪念日的下一次日期、距今天数、周年数"""
     month, day = anniversary.date.month, anniversary.date.day
@@ -24,9 +34,9 @@ def compute_next_info(anniversary: Anniversary, today: date) -> tuple:
     if anniversary.is_recurring:
         # 计算今年和明年的日期
         this_year = today.year
-        next_date = date(this_year, month, day)
+        next_date = _safe_date(this_year, month, day)
         if next_date < today:
-            next_date = date(this_year + 1, month, day)
+            next_date = _safe_date(this_year + 1, month, day)
 
         days_until = (next_date - today).days
 
@@ -38,14 +48,14 @@ def compute_next_info(anniversary: Anniversary, today: date) -> tuple:
     else:
         # 非重复：使用原始日期（加上年份）
         if anniversary.year:
-            target = date(anniversary.year, month, day)
+            target = _safe_date(anniversary.year, month, day)
             if target < today:
                 return None, None, None
             days_until = (target - today).days
             return target, days_until, 0
         else:
             # 无年份的日期按今年算
-            target = date(today.year, month, day)
+            target = _safe_date(today.year, month, day)
             if target < today:
                 return None, None, None
             days_until = (target - today).days
@@ -219,10 +229,10 @@ def create_anniversary(data: AnniversaryCreate, db: Session = Depends(get_db)):
         db.refresh(db_anniversary)
 
         today = date.today()
-        next_date, days_until, year_count = compute_next_info(db_anniversary, today)
+        result = enrich_anniversary(db_anniversary, today)
 
         logger.info(f"创建纪念日成功: id={db_anniversary.id}, title={db_anniversary.title}")
-        return db_anniversary
+        return result
     except Exception as e:
         db.rollback()
         logger.error(f"创建纪念日失败: {str(e)}")
@@ -234,7 +244,9 @@ def get_anniversary(anniversary_id: int, db: Session = Depends(get_db)):
     """获取单个纪念日"""
     try:
         anniversary = get_or_404(db, Anniversary, anniversary_id, "纪念日")
-        return anniversary
+        today = date.today()
+        result = enrich_anniversary(anniversary, today)
+        return result
     except HTTPException:
         raise
     except Exception as e:

api/app/schemas/account.py

@@ -82,6 +82,14 @@ class AccountHistoryResponse(BaseModel):
         from_attributes = True
 
 
+class PaginatedAccountHistoryResponse(BaseModel):
+    """分页账户变更历史响应模型"""
+    total: int
+    page: int
+    page_size: int
+    records: List[AccountHistoryResponse] = []
+
+
 # ============ 分期还款计划 Schema ============
 
 class DebtInstallmentBase(BaseModel):