Adding a Users Table and Retrieving Users by Email

To implement user authentication, we’ll need to create a users table in our database to store user information. We’ll then create endpoints to register new users and retrieve existing users by email.

Creating the Users Table

Assuming you’re using SQLAlchemy to interact with your database, create a User model:

Python

from sqlalchemy import Column, Integer, String
from sqlalchemy.orm import declarative_base

Base = declarative_base()

class User(Base):
    __tablename__ = "users"

    id = Column(Integer, primary_key=True,    index=True)
    email = Column(String,    unique=True, index=True)
    password = Column(String)

Creating an Endpoint to Register Users

Python

from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session
from app.models import User, UserCreate   
from app.schemas import UserSchema

router = APIRouter()

@router.post("/users", response_model=UserSchema)
async def create_user(user: UserCreate, db: Session = Depends(get_db)):
    db_user = User(**user.dict())
    db.add(db_user)
    await db.commit()
    await db.refresh(db_user)
    return db_user

Creating an Endpoint to Retrieve Users by Email

Python

@router.get("/users/{email}", response_model=UserSchema)
async def get_user_by_email(email: str, db: Session = Depends(get_db)):
    user = await db.query(User).filter(User.email == email).first()
    if not user:
        raise HTTPException(status_code=404, detail="User not found")
    return user   

Additional Terms

• Password Hashing: Use a strong password hashing algorithm (e.g., bcrypt) to store passwords securely.
• Error Handling: Implement appropriate error handling to catch exceptions like database errors or validation errors.
• Security: Protect your application from common security vulnerabilities like SQL injection and cross-site scripting (XSS).
• User Roles: Consider adding a role column to the users table to implement role-based access control.