feat: add email verification

backend/app/api/users.py

@@ -1,19 +1,28 @@
-from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi import APIRouter, Depends, HTTPException, status, BackgroundTasks
 from fastapi.security import OAuth2PasswordRequestForm
 from sqlalchemy.orm import Session
 from typing import List
+import secrets
+import hashlib
+from datetime import datetime, timedelta, timezone
 
 from app.database import get_db, engine, Base
-from app.models.user import User
-from app.schemas.user import UserCreate, UserUpdate, UserResponse
+from app.models.user import User, EmailVerification
+from app.schemas.user import UserCreate, UserUpdate, UserResponse, ResendVerificationRequest
 from app.core.security import get_password_hash, verify_password, create_access_token, ACCESS_TOKEN_EXPIRE_MINUTES
-from datetime import timedelta
+from app.core.email import send_verification_email
 
 # Create tables
 Base.metadata.create_all(bind=engine)
 
 router = APIRouter()
 
+def generate_verification_token() -> str:
+    return secrets.token_urlsafe(32)
+
+def hash_token(token: str) -> str:
+    return hashlib.sha256(token.encode()).hexdigest()
+
 @router.post("/auth/login")
 def login(form_data: OAuth2PasswordRequestForm = Depends(), db: Session = Depends(get_db)):
     user = db.query(User).filter(User.username == form_data.username).first()
@@ -45,7 +54,7 @@ def login(form_data: OAuth2PasswordRequestForm = Depends(), db: Session = Depend
     }
 
 @router.post("/auth/register", response_model=UserResponse)
-def register_user(user: UserCreate, db: Session = Depends(get_db)):
+def register_user(user: UserCreate, background_tasks: BackgroundTasks, db: Session = Depends(get_db)):
     db_user = db.query(User).filter(User.username == user.username).first()
     if db_user:
         raise HTTPException(status_code=400, detail="Username already registered")
@@ -58,19 +67,92 @@ def register_user(user: UserCreate, db: Session = Depends(get_db)):
     
     # If this is the first user, make them an admin
     is_first_user = db.query(User).count() == 0
+    is_admin = is_first_user or user.is_admin
+    is_active = True if is_first_user else False
     
     db_user = User(
         username=user.username,
         email=user.email,
         hashed_password=hashed_password,
-        is_active=True,
-        is_admin=is_first_user or user.is_admin
+        is_active=is_active,
+        is_admin=is_admin
     )
     db.add(db_user)
     db.commit()
     db.refresh(db_user)
+
+    if not is_active:
+        token = generate_verification_token()
+        hashed = hash_token(token)
+        expires_at = datetime.now(timezone.utc) + timedelta(hours=24)
+        verification = EmailVerification(
+            user_id=db_user.id,
+            token_hash=hashed,
+            expires_at=expires_at
+        )
+        db.add(verification)
+        db.commit()
+        
+        # 将用户的 email 保存到局部变量中，防止在后台任务执行前 session 关闭导致延迟加载失败
+        user_email = db_user.email
+        background_tasks.add_task(send_verification_email, user_email, token)
+
     return db_user
 
+@router.get("/auth/verify-email")
+def verify_email(token: str, db: Session = Depends(get_db)):
+    hashed = hash_token(token)
+    verification = db.query(EmailVerification).filter(
+        EmailVerification.token_hash == hashed,
+        EmailVerification.is_used == False
+    ).first()
+    
+    if not verification:
+        raise HTTPException(status_code=400, detail="Invalid or used token")
+        
+    # Check if expired (make timezone-aware if naive)
+    expires_at = verification.expires_at
+    if expires_at.tzinfo is None:
+        expires_at = expires_at.replace(tzinfo=timezone.utc)
+        
+    if expires_at < datetime.now(timezone.utc):
+        raise HTTPException(status_code=400, detail="Token expired")
+        
+    user = db.query(User).filter(User.id == verification.user_id).first()
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+        
+    user.is_active = True
+    verification.is_used = True
+    db.commit()
+    
+    return {"status": "success", "message": "Email verified successfully"}
+
+@router.post("/auth/resend-verification")
+def resend_verification(request: ResendVerificationRequest, background_tasks: BackgroundTasks, db: Session = Depends(get_db)):
+    user = db.query(User).filter(User.username == request.username).first()
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+        
+    if user.is_active:
+        raise HTTPException(status_code=400, detail="User already active")
+        
+    token = generate_verification_token()
+    hashed = hash_token(token)
+    expires_at = datetime.now(timezone.utc) + timedelta(hours=24)
+    verification = EmailVerification(
+        user_id=user.id,
+        token_hash=hashed,
+        expires_at=expires_at
+    )
+    db.add(verification)
+    db.commit()
+    
+    # 提取 email，避免后台任务访问已断开的 db session
+    user_email = user.email
+    background_tasks.add_task(send_verification_email, user_email, token)
+    return {"status": "success", "message": "Verification email sent"}
+
 @router.get("/users", response_model=List[UserResponse])
 def read_users(skip: int = 0, limit: int = 100, db: Session = Depends(get_db)):
     users = db.query(User).offset(skip).limit(limit).all()

backend/app/core/email.py

@@ -0,0 +1,43 @@
+import smtplib
+import os
+from email.mime.text import MIMEText
+from email.mime.multipart import MIMEMultipart
+
+def send_verification_email(to_email: str, token: str):
+    smtp_host = os.getenv("SMTP_HOST", "smtp.qq.com")
+    smtp_port = int(os.getenv("SMTP_PORT", "465"))
+    smtp_user = os.getenv("SMTP_USER", "")
+    smtp_password = os.getenv("SMTP_PASSWORD", "")
+    frontend_url = os.getenv("FRONTEND_URL", "http://localhost:5173")
+
+    if not smtp_user or not smtp_password:
+        print("SMTP configuration is missing. Skip sending email.")
+        return
+
+    msg = MIMEMultipart()
+    msg['From'] = smtp_user
+    msg['To'] = to_email
+    msg['Subject'] = "Please verify your email address"
+
+    verify_link = f"{frontend_url}/verify-email?token={token}"
+    body = f"""
+    <html>
+        <body>
+            <h2>Welcome to DataClaw!</h2>
+            <p>Please click the link below to verify your email address and activate your account:</p>
+            <p><a href="{verify_link}">{verify_link}</a></p>
+            <p>If you did not request this, please ignore this email.</p>
+        </body>
+    </html>
+    """
+    msg.attach(MIMEText(body, 'html'))
+
+    try:
+        # Use SMTP_SSL for port 465
+        server = smtplib.SMTP_SSL(smtp_host, smtp_port)
+        server.login(smtp_user, smtp_password)
+        server.send_message(msg)
+        server.quit()
+        print(f"Verification email sent to {to_email}")
+    except Exception as e:
+        print(f"Failed to send email: {e}")

backend/app/models/user.py

@@ -1,4 +1,4 @@
-from sqlalchemy import Column, Integer, String, Boolean, DateTime
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, ForeignKey
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
 from app.database import Base
@@ -15,3 +15,16 @@ class User(Base):
     created_at = Column(DateTime(timezone=True), server_default=func.now())
 
     projects = relationship("Project", back_populates="owner")
+    email_verifications = relationship("EmailVerification", back_populates="user", cascade="all, delete-orphan")
+
+class EmailVerification(Base):
+    __tablename__ = "email_verifications"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+    token_hash = Column(String, index=True, nullable=False)
+    expires_at = Column(DateTime(timezone=True), nullable=False)
+    is_used = Column(Boolean, default=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+    user = relationship("User", back_populates="email_verifications")

backend/app/schemas/user.py

@@ -18,6 +18,9 @@ class UserUpdate(BaseModel):
     is_admin: Optional[bool] = None
     password: Optional[str] = None
 
+class ResendVerificationRequest(BaseModel):
+    username: str
+
 class UserResponse(UserBase):
     id: int
     created_at: datetime