first commit

backend/app/routers/auth.py

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+from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordRequestForm
+from sqlalchemy.orm import Session
+from pydantic import BaseModel, EmailStr
+from app.models import get_db
+from app.models.user import User, UserRole
+from app.utils.security import (
+    get_password_hash, verify_password,
+    create_access_token, get_current_user
+)
+
+router = APIRouter(prefix="/auth", tags=["Authentication"])
+
+class UserCreate(BaseModel):
+    email: EmailStr
+    password: str
+
+class UserResponse(BaseModel):
+    id: int
+    email: str
+    role: str
+
+    class Config:
+        from_attributes = True
+
+class TokenResponse(BaseModel):
+    access_token: str
+    token_type: str
+    user: UserResponse
+
+def get_role_value(role) -> str:
+    """取得 role 的字串值，相容 Enum 和字串"""
+    if hasattr(role, 'value'):
+        return role.value
+    return str(role) if role else 'user'
+
+@router.post("/register", response_model=UserResponse)
+def register(user_data: UserCreate, db: Session = Depends(get_db)):
+    """註冊新使用者"""
+    existing_user = db.query(User).filter(User.email == user_data.email).first()
+    if existing_user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Email already registered"
+        )
+
+    user = User(
+        email=user_data.email,
+        password_hash=get_password_hash(user_data.password),
+        role=UserRole.user
+    )
+    db.add(user)
+    db.commit()
+    db.refresh(user)
+
+    return UserResponse(id=user.id, email=user.email, role=get_role_value(user.role))
+
+@router.post("/login", response_model=TokenResponse)
+def login(form_data: OAuth2PasswordRequestForm = Depends(), db: Session = Depends(get_db)):
+    """登入取得 JWT Token"""
+    user = db.query(User).filter(User.email == form_data.username).first()
+    if not user or not verify_password(form_data.password, user.password_hash):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect email or password",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+
+    access_token = create_access_token(data={"sub": str(user.id)})
+
+    return TokenResponse(
+        access_token=access_token,
+        token_type="bearer",
+        user=UserResponse(id=user.id, email=user.email, role=get_role_value(user.role))
+    )
+
+@router.get("/me", response_model=UserResponse)
+def get_me(current_user: User = Depends(get_current_user)):
+    """取得當前使用者資訊"""
+    return UserResponse(
+        id=current_user.id,
+        email=current_user.email,
+        role=get_role_value(current_user.role)
+    )