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backend/app/schemas/user.py

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+"""用户相关 Pydantic v2 Schema（请求/响应）。"""
+
+import re
+
+from pydantic import BaseModel, EmailStr, Field, field_validator
+
+_USERNAME_RE = re.compile(r"^[A-Za-z0-9_\-一-鿿]{2,32}$")
+
+
+class RegisterRequest(BaseModel):
+    username: str = Field(min_length=2, max_length=32)
+    email: str = Field(min_length=5, max_length=255)
+    password: str = Field(min_length=8, max_length=128)
+
+    @field_validator("username")
+    @classmethod
+    def validate_username(cls, v: str) -> str:
+        if not _USERNAME_RE.match(v):
+            raise ValueError("用户名只能包含字母、数字、下划线、短横线和中文，长度 2-32。")
+        return v
+
+    @field_validator("email")
+    @classmethod
+    def validate_email(cls, v: str) -> str:
+        # 简单格式校验（不引入 email-validator 重依赖）
+        if "@" not in v or "." not in v.split("@")[-1]:
+            raise ValueError("邮箱格式不正确。")
+        return v.lower().strip()
+
+    @field_validator("password")
+    @classmethod
+    def validate_password(cls, v: str) -> str:
+        if len(v) < 8:
+            raise ValueError("密码长度不能少于 8 位。")
+        return v
+
+
+class LoginRequest(BaseModel):
+    username_or_email: str = Field(min_length=2, max_length=255)
+    password: str = Field(min_length=1, max_length=128)
+
+
+class UserResponse(BaseModel):
+    id: str
+    username: str
+    email: str
+    status: str
+    storage_used: int
+    storage_quota: int
+    created_at: str
+
+    model_config = {"from_attributes": True}
+
+
+class MeResponse(BaseModel):
+    id: str
+    username: str
+    email: str
+    status: str
+    storage_used: int
+    storage_quota: int
+    created_at: str
+
+    model_config = {"from_attributes": True}
+
+
+class StorageInfoResponse(BaseModel):
+    storage_used: int
+    storage_quota: int
+    storage_used_mb: float
+    storage_quota_mb: float
+
+
+class UpdateMeRequest(BaseModel):
+    password: str | None = Field(default=None, min_length=8, max_length=128)
+
+    @field_validator("password")
+    @classmethod
+    def validate_password(cls, v: str | None) -> str | None:
+        if v is not None and len(v) < 8:
+            raise ValueError("密码长度不能少于 8 位。")
+        return v