更新

backend/auth/password_reset.py

@@ -0,0 +1,64 @@
+"""密码重置令牌创建与校验。"""
+
+from __future__ import annotations
+
+import secrets
+from datetime import datetime, timedelta
+
+from sqlalchemy import delete, select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from models.models import PasswordResetToken, User
+
+
+def _token_expires_at(hours: int) -> datetime:
+    return datetime.utcnow() + timedelta(hours=max(1, min(168, int(hours or 24))))
+
+
+async def invalidate_user_reset_tokens(db: AsyncSession, user_id: int) -> None:
+    await db.execute(
+        delete(PasswordResetToken).where(PasswordResetToken.user_id == user_id)
+    )
+
+
+async def create_password_reset_token(
+    db: AsyncSession,
+    user: User,
+    expire_hours: int = 24,
+) -> str:
+    await invalidate_user_reset_tokens(db, user.id)
+    token = secrets.token_urlsafe(32)
+    db.add(
+        PasswordResetToken(
+            user_id=user.id,
+            token=token,
+            expires_at=_token_expires_at(expire_hours),
+        )
+    )
+    await db.flush()
+    return token
+
+
+async def verify_password_reset_token(db: AsyncSession, token: str) -> User | None:
+    value = (token or "").strip()
+    if not value:
+        return None
+
+    result = await db.execute(
+        select(PasswordResetToken, User)
+        .join(User, User.id == PasswordResetToken.user_id)
+        .where(PasswordResetToken.token == value)
+    )
+    row = result.first()
+    if not row:
+        return None
+
+    record, user = row
+    if record.expires_at < datetime.utcnow():
+        await db.delete(record)
+        await db.flush()
+        return None
+
+    await db.delete(record)
+    await db.flush()
+    return user