Implement identity service with flexible authentication

2025-06-05 10:07:49 +00:00 · 2025-06-05 10:07:49 +00:00 · 521be496ef
commit 521be496ef
parent ae704f2ab4
33 changed files with 1068 additions and 2 deletions
--- a/README.md
+++ b/README.md
@ -1,3 +1,136 @@
-# FastAPI Application
+# Identity Service API

-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A FastAPI-based API for managing user identities and authentication that supports flexible login with either username or email.
+
+## Features
+
+- User registration with either email or username
+- Flexible authentication (login with either email or username)
+- JWT token-based authentication
+- Password hashing with bcrypt
+- SQLite database with SQLAlchemy ORM
+- Database migrations with Alembic
+- API documentation with Swagger UI and ReDoc
+
+## Requirements
+
+- Python 3.8+
+- FastAPI
+- SQLAlchemy
+- Alembic
+- PyJWT
+- PassLib
+- Uvicorn
+- Email validator
+
+## Installation
+
+1. Clone the repository:
+
+```bash
+git clone https://github.com/yourusername/identityservice.git
+cd identityservice
+```
+
+2. Install dependencies:
+
+```bash
+pip install -r requirements.txt
+```
+
+3. Set up environment variables (optional):
+
+Create a `.env` file in the root directory with the following variables:
+
+```
+SECRET_KEY=your-secret-key
+ACCESS_TOKEN_EXPIRE_MINUTES=30
+```
+
+## Database Setup
+
+The application uses SQLite by default. The database will be created at `/app/storage/db/db.sqlite`.
+
+To apply migrations:
+
+```bash
+alembic upgrade head
+```
+
+## Running the Application
+
+Start the server:
+
+```bash
+uvicorn main:app --reload
+```
+
+The API will be available at http://localhost:8000
+
+## API Documentation
+
+- Swagger UI: http://localhost:8000/docs
+- ReDoc: http://localhost:8000/redoc
+- OpenAPI JSON: http://localhost:8000/openapi.json
+
+## API Endpoints
+
+### Authentication
+
+- `POST /api/v1/auth/login` - OAuth2 compatible login (accepts username or email in the username field)
+- `POST /api/v1/auth/login/flexible` - Login with separate email and username fields
+
+### Users
+
+- `POST /api/v1/users/` - Create a new user
+- `GET /api/v1/users/me` - Get current user info
+- `PUT /api/v1/users/me` - Update current user info
+
+### Health Check
+
+- `GET /health` - API health check
+
+## Environment Variables
+
+| Variable | Description | Default |
+| --- | --- | --- |
+| `SECRET_KEY` | JWT secret key | Auto-generated secure token |
+| `ACCESS_TOKEN_EXPIRE_MINUTES` | JWT token expiration time | 30 minutes |
+| `BACKEND_CORS_ORIGINS` | CORS allowed origins | ["*"] |
+
+## Project Structure
+
+```
+.
+├── alembic.ini
+├── app
+│   ├── api
+│   │   ├── api_v1
+│   │   │   ├── api.py
+│   │   │   └── endpoints
+│   │   │       ├── auth.py
+│   │   │       └── users.py
+│   │   └── deps.py
+│   ├── core
+│   │   ├── config.py
+│   │   └── security.py
+│   ├── crud
+│   │   └── user.py
+│   ├── db
+│   │   ├── base.py
+│   │   ├── base_class.py
+│   │   └── session.py
+│   ├── models
+│   │   └── user.py
+│   └── schemas
+│       ├── auth.py
+│       └── user.py
+├── main.py
+├── migrations
+│   ├── env.py
+│   ├── README
+│   ├── script.py.mako
+│   └── versions
+│       └── 001_create_user_table.py
+└── requirements.txt
+```
--- a/alembic.ini
+++ b/alembic.ini
@ -0,0 +1,85 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = migrations
+
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# timezone to use when rendering the date
+# within the migration file as well as the filename.
+# string value is passed to dateutil.tz.gettz()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the
+# "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version location specification; this defaults
+# to migrations/versions.  When using multiple version
+# directories, initial revisions must be specified with --version-path
+# version_locations = %(here)s/bar %(here)s/bat migrations/versions
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+# SQLite URL example
+sqlalchemy.url = sqlite:////app/storage/db/db.sqlite
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.  See the documentation for further
+# detail and examples
+
+# format using "black" - use the console_scripts runner, against the "black" entrypoint
+# hooks=black
+# black.type=console_scripts
+# black.entrypoint=black
+# black.options=-l 79
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S
--- a/app/init.py
+++ b/app/init.py
--- a/app/api/init.py
+++ b/app/api/init.py
--- a/app/api/api_v1/init.py
+++ b/app/api/api_v1/init.py
--- a/app/api/api_v1/api.py
+++ b/app/api/api_v1/api.py
@ -0,0 +1,7 @@
+from fastapi import APIRouter
+
+from app.api.api_v1.endpoints import auth, users
+
+api_router = APIRouter()
+api_router.include_router(auth.router, prefix="/auth", tags=["Authentication"])
+api_router.include_router(users.router, prefix="/users", tags=["Users"])
--- a/app/api/api_v1/endpoints/init.py
+++ b/app/api/api_v1/endpoints/init.py
--- a/app/api/api_v1/endpoints/auth.py
+++ b/app/api/api_v1/endpoints/auth.py
@ -0,0 +1,84 @@
+from datetime import timedelta
+from typing import Any
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordRequestForm
+from sqlalchemy.orm import Session
+
+from app import crud, schemas
+from app.api import deps
+from app.core import security
+from app.core.config import settings
+from app.schemas.auth import LoginRequest
+
+router = APIRouter()
+
+
+@router.post("/login", response_model=schemas.Token)
+async def login_access_token(
+    db: Session = Depends(deps.get_db), form_data: OAuth2PasswordRequestForm = Depends()
+) -> Any:
+    """
+    OAuth2 compatible token login, get an access token for future requests using username/password
+    """
+    # For OAuth2 form, username field can contain either email or username
+    identifier = form_data.username
+    user = None
+
+    # Try to authenticate with email
+    if "@" in identifier:
+        user = crud.user.authenticate(db, email=identifier, password=form_data.password)
+    else:
+        # Try to authenticate with username
+        user = crud.user.authenticate(db, username=identifier, password=form_data.password)
+
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect username/email or password",
+        )
+    elif not crud.user.is_active(user):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED, detail="Inactive user"
+        )
+
+    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+    return {
+        "access_token": security.create_access_token(
+            user.id, expires_delta=access_token_expires
+        ),
+        "token_type": "bearer",
+    }
+
+
+@router.post("/login/flexible", response_model=schemas.Token)
+async def login_flexible(
+    login_data: LoginRequest, db: Session = Depends(deps.get_db)
+) -> Any:
+    """
+    Login with either email or username
+    """
+    user = crud.user.authenticate(
+        db,
+        email=login_data.email,
+        username=login_data.username,
+        password=login_data.password
+    )
+
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect username/email or password",
+        )
+    elif not crud.user.is_active(user):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED, detail="Inactive user"
+        )
+
+    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+    return {
+        "access_token": security.create_access_token(
+            user.id, expires_delta=access_token_expires
+        ),
+        "token_type": "bearer",
+    }
--- a/app/api/api_v1/endpoints/users.py
+++ b/app/api/api_v1/endpoints/users.py
@ -0,0 +1,90 @@
+from typing import Any
+
+from fastapi import APIRouter, Body, Depends, HTTPException, status
+from pydantic import EmailStr
+from sqlalchemy.orm import Session
+
+from app import crud, models, schemas
+from app.api import deps
+
+router = APIRouter()
+
+
+@router.post("/", response_model=schemas.User)
+def create_user(
+    *,
+    db: Session = Depends(deps.get_db),
+    user_in: schemas.UserCreate,
+) -> Any:
+    """
+    Create new user with either email or username
+    """
+    # Check if user exists with provided email
+    if user_in.email:
+        user = crud.user.get_by_email(db, email=user_in.email)
+        if user:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Email already registered",
+            )
+
+    # Check if user exists with provided username
+    if user_in.username:
+        user = crud.user.get_by_username(db, username=user_in.username)
+        if user:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Username already registered",
+            )
+
+    # Create new user
+    user = crud.user.create(db, obj_in=user_in)
+    return user
+
+
+@router.get("/me", response_model=schemas.User)
+def read_user_me(
+    current_user: models.User = Depends(deps.get_current_active_user),
+) -> Any:
+    """
+    Get current user
+    """
+    return current_user
+
+
+@router.put("/me", response_model=schemas.User)
+def update_user_me(
+    *,
+    db: Session = Depends(deps.get_db),
+    current_user: models.User = Depends(deps.get_current_active_user),
+    email: EmailStr = Body(None),
+    username: str = Body(None),
+    password: str = Body(None),
+) -> Any:
+    """
+    Update current user
+    """
+    user_in = schemas.UserUpdate(
+        email=email, username=username, password=password
+    )
+
+    # If updating email, check it's not already taken
+    if email and email != current_user.email:
+        user = crud.user.get_by_email(db, email=email)
+        if user:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Email already registered",
+            )
+
+    # If updating username, check it's not already taken
+    if username and username != current_user.username:
+        user = crud.user.get_by_username(db, username=username)
+        if user:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Username already registered",
+            )
+
+    user = crud.user.update(db, db_obj=current_user, obj_in=user_in)
+    return user
--- a/app/api/deps.py
+++ b/app/api/deps.py
@ -0,0 +1,73 @@
+from typing import Generator
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jose import JWTError, jwt
+from pydantic import ValidationError
+from sqlalchemy.orm import Session
+
+from app import crud, models, schemas
+from app.core import security
+from app.core.config import settings
+from app.db.session import SessionLocal
+
+oauth2_scheme = OAuth2PasswordBearer(
+    tokenUrl=f"{settings.API_V1_STR}/auth/login"
+)
+
+
+def get_db() -> Generator:
+    """
+    Dependency for getting DB session
+    """
+    try:
+        db = SessionLocal()
+        yield db
+    finally:
+        db.close()
+
+
+def get_current_user(
+    db: Session = Depends(get_db), token: str = Depends(oauth2_scheme)
+) -> models.User:
+    """
+    Dependency for getting current user from JWT token
+    """
+    try:
+        payload = jwt.decode(
+            token, settings.SECRET_KEY, algorithms=[security.ALGORITHM]
+        )
+        token_data = schemas.TokenPayload(**payload)
+    except (JWTError, ValidationError):
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Could not validate credentials",
+        )
+    user = crud.user.get_by_id(db, id=token_data.sub)
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+    return user
+
+
+def get_current_active_user(
+    current_user: models.User = Depends(get_current_user),
+) -> models.User:
+    """
+    Dependency for getting current active user
+    """
+    if not crud.user.is_active(current_user):
+        raise HTTPException(status_code=400, detail="Inactive user")
+    return current_user
+
+
+def get_current_active_superuser(
+    current_user: models.User = Depends(get_current_user),
+) -> models.User:
+    """
+    Dependency for getting current superuser
+    """
+    if not crud.user.is_superuser(current_user):
+        raise HTTPException(
+            status_code=400, detail="The user doesn't have enough privileges"
+        )
+    return current_user
--- a/app/core/init.py
+++ b/app/core/init.py
--- a/app/core/config.py
+++ b/app/core/config.py
@ -0,0 +1,30 @@
+import secrets
+from pathlib import Path
+from typing import List
+
+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    PROJECT_NAME: str = "Identity Service"
+    API_V1_STR: str = "/api/v1"
+
+    # SECURITY
+    SECRET_KEY: str = secrets.token_urlsafe(32)
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
+
+    # CORS
+    BACKEND_CORS_ORIGINS: List[str] = ["*"]
+
+    # Database
+    DB_DIR: Path = Path("/app") / "storage" / "db"
+
+    class Config:
+        env_file = ".env"
+        case_sensitive = True
+
+
+settings = Settings()
+
+# Create DB directory if it doesn't exist
+settings.DB_DIR.mkdir(parents=True, exist_ok=True)
--- a/app/core/security.py
+++ b/app/core/security.py
@ -0,0 +1,42 @@
+from datetime import datetime, timedelta
+from typing import Any, Optional, Union
+
+from jose import jwt
+from passlib.context import CryptContext
+
+from app.core.config import settings
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+ALGORITHM = "HS256"
+
+
+def create_access_token(
+    subject: Union[str, Any], expires_delta: Optional[timedelta] = None
+) -> str:
+    """
+    Create a JWT access token
+    """
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(
+            minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES
+        )
+    to_encode = {"exp": expire, "sub": str(subject)}
+    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=ALGORITHM)
+    return encoded_jwt
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    """
+    Verify a password against a hash
+    """
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def get_password_hash(password: str) -> str:
+    """
+    Hash a password
+    """
+    return pwd_context.hash(password)
--- a/app/crud/init.py
+++ b/app/crud/init.py
--- a/app/crud/user.py
+++ b/app/crud/user.py
@ -0,0 +1,113 @@
+from typing import Any, Dict, Optional, Union
+
+from sqlalchemy.orm import Session
+
+from app.core.security import get_password_hash, verify_password
+from app.models.user import User
+from app.schemas.user import UserCreate, UserUpdate
+
+
+def get_by_email(db: Session, email: str) -> Optional[User]:
+    """
+    Get a user by email
+    """
+    return db.query(User).filter(User.email == email).first()
+
+
+def get_by_username(db: Session, username: str) -> Optional[User]:
+    """
+    Get a user by username
+    """
+    return db.query(User).filter(User.username == username).first()
+
+
+def get_by_id(db: Session, id: int) -> Optional[User]:
+    """
+    Get a user by ID
+    """
+    return db.query(User).filter(User.id == id).first()
+
+
+def get_by_email_or_username(
+    db: Session, email: Optional[str] = None, username: Optional[str] = None
+) -> Optional[User]:
+    """
+    Get a user by email or username
+    """
+    if email:
+        return get_by_email(db, email)
+    if username:
+        return get_by_username(db, username)
+    return None
+
+
+def create(db: Session, *, obj_in: UserCreate) -> User:
+    """
+    Create a new user
+    """
+    db_obj = User(
+        email=obj_in.email,
+        username=obj_in.username,
+        hashed_password=get_password_hash(obj_in.password),
+        is_active=obj_in.is_active,
+        is_superuser=obj_in.is_superuser,
+    )
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+
+def update(
+    db: Session, *, db_obj: User, obj_in: Union[UserUpdate, Dict[str, Any]]
+) -> User:
+    """
+    Update a user
+    """
+    if isinstance(obj_in, dict):
+        update_data = obj_in
+    else:
+        update_data = obj_in.dict(exclude_unset=True)
+
+    # Handle password update
+    if "password" in update_data:
+        hashed_password = get_password_hash(update_data["password"])
+        del update_data["password"]
+        update_data["hashed_password"] = hashed_password
+
+    for field in update_data:
+        if hasattr(db_obj, field):
+            setattr(db_obj, field, update_data[field])
+
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+
+def authenticate(
+    db: Session, *, email: Optional[str] = None, username: Optional[str] = None, password: str
+) -> Optional[User]:
+    """
+    Authenticate a user with email/username and password
+    """
+    user = get_by_email_or_username(db, email=email, username=username)
+    if not user:
+        return None
+    if not verify_password(password, user.hashed_password):
+        return None
+    return user
+
+
+def is_active(user: User) -> bool:
+    """
+    Check if a user is active
+    """
+    return user.is_active
+
+
+def is_superuser(user: User) -> bool:
+    """
+    Check if a user is a superuser
+    """
+    return user.is_superuser
--- a/app/db/init.py
+++ b/app/db/init.py
--- a/app/db/base.py
+++ b/app/db/base.py
@ -0,0 +1,5 @@
+# Import all the models, so that Base has them before being
+# imported by Alembic
+from app.db.base_class import Base  # noqa
+# Import your models here so they are registered with SQLAlchemy
+from app.models.user import User  # noqa
--- a/app/db/base_class.py
+++ b/app/db/base_class.py
@ -0,0 +1,15 @@
+from datetime import datetime
+
+from sqlalchemy import Column, DateTime, Integer
+from sqlalchemy.ext.declarative import declared_attr
+from sqlalchemy.orm import DeclarativeBase
+
+
+class Base(DeclarativeBase):
+    id = Column(Integer, primary_key=True, index=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    @declared_attr
+    def __tablename__(cls) -> str:
+        return cls.__name__.lower()
--- a/app/db/session.py
+++ b/app/db/session.py
@ -0,0 +1,29 @@
+from pathlib import Path
+
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+# Create DB directory if it doesn't exist
+DB_DIR = Path("/app") / "storage" / "db"
+DB_DIR.mkdir(parents=True, exist_ok=True)
+
+SQLALCHEMY_DATABASE_URL = f"sqlite:///{DB_DIR}/db.sqlite"
+
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False}
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()
+
+
+# Dependency
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
--- a/app/models/init.py
+++ b/app/models/init.py
--- a/app/models/user.py
+++ b/app/models/user.py
@ -0,0 +1,40 @@
+import re
+
+from sqlalchemy import Boolean, Column, String
+from sqlalchemy.orm import validates
+
+from app.db.base_class import Base
+
+
+class User(Base):
+    """
+    User model with flexible authentication (username or email).
+    """
+    username = Column(String, unique=True, index=True, nullable=True)
+    email = Column(String, unique=True, index=True, nullable=True)
+    hashed_password = Column(String, nullable=False)
+    is_active = Column(Boolean, default=True)
+    is_superuser = Column(Boolean, default=False)
+
+    @validates('email')
+    def validate_email(self, key, email):
+        if email is None:
+            return email
+
+        # Simple email validation regex
+        if not re.match(r'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$', email):
+            raise ValueError('Invalid email format')
+        return email
+
+    @validates('username')
+    def validate_username(self, key, username):
+        if username is None:
+            return username
+
+        # Username validation: alphanumeric + underscore, 3-20 chars
+        if not re.match(r'^[a-zA-Z0-9_]{3,20}$', username):
+            raise ValueError(
+                'Username must be 3-20 characters and contain only letters, numbers, '
+                'and underscores'
+            )
+        return username
--- a/app/schemas/init.py
+++ b/app/schemas/init.py
--- a/app/schemas/auth.py
+++ b/app/schemas/auth.py
@ -0,0 +1,23 @@
+from typing import Optional
+
+from pydantic import BaseModel, EmailStr, root_validator
+
+
+class LoginRequest(BaseModel):
+    """
+    Login schema with flexible identifier (email or username)
+    """
+    # Either email or username must be provided
+    email: Optional[EmailStr] = None
+    username: Optional[str] = None
+    password: str
+
+    @root_validator
+    def check_email_or_username(cls, values):
+        """
+        Validate that either email or username is provided
+        """
+        email, username = values.get("email"), values.get("username")
+        if not email and not username:
+            raise ValueError("Either email or username must be provided")
+        return values
--- a/app/schemas/user.py
+++ b/app/schemas/user.py
@ -0,0 +1,81 @@
+from typing import Optional
+
+from pydantic import BaseModel, EmailStr, Field, validator
+
+
+class UserBase(BaseModel):
+    """
+    Base schema for user data
+    """
+    email: Optional[EmailStr] = None
+    username: Optional[str] = Field(None, min_length=3, max_length=20, pattern=r'^[a-zA-Z0-9_]+$')
+    is_active: Optional[bool] = True
+    is_superuser: bool = False
+
+    @validator('username')
+    def username_not_empty(cls, v):
+        if v == "":
+            raise ValueError('Username cannot be empty string')
+        return v
+
+    @validator('email', 'username')
+    def check_one_field_present(cls, v, values):
+        # If this is the second field (email or username) and both are None, raise error
+        if 'email' in values and v is None and values['email'] is None:
+            raise ValueError('Either email or username must be provided')
+        if 'username' in values and v is None and values['username'] is None:
+            raise ValueError('Either email or username must be provided')
+        return v
+
+
+class UserCreate(UserBase):
+    """
+    Schema for creating a new user
+    """
+    password: str = Field(..., min_length=8)
+
+
+class UserUpdate(UserBase):
+    """
+    Schema for updating a user
+    """
+    password: Optional[str] = Field(None, min_length=8)
+
+
+class UserInDBBase(UserBase):
+    """
+    Schema for user in DB
+    """
+    id: int
+
+    class Config:
+        orm_mode = True
+
+
+class User(UserInDBBase):
+    """
+    Schema for returning user information
+    """
+    pass
+
+
+class UserInDB(UserInDBBase):
+    """
+    Schema with password hash (for internal use)
+    """
+    hashed_password: str
+
+
+class Token(BaseModel):
+    """
+    Token schema
+    """
+    access_token: str
+    token_type: str
+
+
+class TokenPayload(BaseModel):
+    """
+    Token payload schema
+    """
+    sub: Optional[int] = None
--- a/app/services/init.py
+++ b/app/services/init.py
--- a/app/utils/init.py
+++ b/app/utils/init.py
--- a/main.py
+++ b/main.py
@ -0,0 +1,42 @@
+import uvicorn
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.api.api_v1.api import api_router
+from app.core.config import settings
+
+app = FastAPI(
+    title="Identity Service API",
+    description="API for managing user identities and authentication",
+    version="0.1.0",
+    openapi_url="/openapi.json",
+)
+
+# Configure CORS
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Include API router
+app.include_router(api_router, prefix=settings.API_V1_STR)
+
+# Health check endpoint
+@app.get("/health", tags=["Health"])
+async def health_check():
+    return {"status": "healthy"}
+
+# Root endpoint
+@app.get("/", tags=["Root"])
+async def root():
+    return {
+        "message": "Welcome to the Identity Service API",
+        "docs": "/docs",
+        "redoc": "/redoc",
+    }
+
+if __name__ == "__main__":
+    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)
--- a/migrations/README
+++ b/migrations/README
@ -0,0 +1 @@
+Generic single-database configuration with SQLite.
--- a/migrations/env.py
+++ b/migrations/env.py
@ -0,0 +1,82 @@
+from logging.config import fileConfig
+
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+from app.db.base import Base  # noqa: E402
+
+target_metadata = Base.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+        render_as_batch=True,
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        is_sqlite = connection.dialect.name == 'sqlite'
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            render_as_batch=is_sqlite,
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
--- a/migrations/script.py.mako
+++ b/migrations/script.py.mako
@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}
--- a/migrations/versions/001_create_user_table.py
+++ b/migrations/versions/001_create_user_table.py
@ -0,0 +1,40 @@
+"""create user table
+
+Revision ID: 001
+Revises:
+Create Date: 2023-07-10 12:34:56.789012
+
+"""
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = '001'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        'user',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('created_at', sa.DateTime(), nullable=True),
+        sa.Column('updated_at', sa.DateTime(), nullable=True),
+        sa.Column('username', sa.String(), nullable=True),
+        sa.Column('email', sa.String(), nullable=True),
+        sa.Column('hashed_password', sa.String(), nullable=False),
+        sa.Column('is_active', sa.Boolean(), nullable=True),
+        sa.Column('is_superuser', sa.Boolean(), nullable=True),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_user_email'), 'user', ['email'], unique=True)
+    op.create_index(op.f('ix_user_id'), 'user', ['id'], unique=False)
+    op.create_index(op.f('ix_user_username'), 'user', ['username'], unique=True)
+
+
+def downgrade() -> None:
+    op.drop_index(op.f('ix_user_username'), table_name='user')
+    op.drop_index(op.f('ix_user_id'), table_name='user')
+    op.drop_index(op.f('ix_user_email'), table_name='user')
+    op.drop_table('user')
--- a/pyproject.toml
+++ b/pyproject.toml
@ -0,0 +1,16 @@
+[tool.ruff]
+line-length = 100
+target-version = "py38"
+
+[tool.ruff.lint]
+select = ["E", "F", "I", "N", "W"]
+ignore = ["N805"]  # Ignore N805 for cls methods in SQLAlchemy and Pydantic
+fixable = ["ALL"]
+unfixable = []
+
+[tool.ruff.lint.isort]
+known-first-party = ["app"]
+
+[tool.ruff.lint.flake8-quotes]
+docstring-quotes = "double"
+inline-quotes = "double"
--- a/requirements.txt
+++ b/requirements.txt
@ -0,0 +1,11 @@
+fastapi>=0.100.0
+uvicorn>=0.22.0
+sqlalchemy>=2.0.0
+alembic>=1.11.1
+pydantic>=2.0.0
+pydantic-settings>=2.0.0
+python-jose[cryptography]>=3.3.0
+passlib[bcrypt]>=1.7.4
+python-multipart>=0.0.6
+email-validator>=2.0.0
+ruff>=0.1.0
				`@ -0,0 +1 @@`
				`Generic single-database configuration with SQLite.`