321 lines
9.9 KiB
Python
321 lines
9.9 KiB
Python
import base64
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import datetime
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import hashlib
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import json
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import random
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import rsa
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import time
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from typing import Optional, Dict
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import bcrypt
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from sqlalchemy import Column, Integer, String, DateTime, ForeignKey
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from sqlalchemy.orm import make_transient
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from platypush.common.db import Base
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from platypush.context import get_plugin
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from platypush.exceptions.user import (
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InvalidJWTTokenException,
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InvalidCredentialsException,
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)
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from platypush.utils import get_or_generate_jwt_rsa_key_pair
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class UserManager:
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"""
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Main class for managing platform users
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"""
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def __init__(self):
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db_plugin = get_plugin('db')
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assert db_plugin, 'Database plugin not configured'
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self.db = db_plugin
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self.db.create_all(self.db.get_engine(), Base)
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@staticmethod
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def _mask_password(user):
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make_transient(user)
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user.password = None
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return user
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def _get_session(self, *args, **kwargs):
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return self.db.get_session(self.db.get_engine(), *args, **kwargs)
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def get_user(self, username):
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with self._get_session() as session:
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user = self._get_user(session, username)
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if not user:
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return None
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session.expunge(user)
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return self._mask_password(user)
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def get_user_count(self):
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with self._get_session() as session:
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return session.query(User).count()
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def get_users(self):
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with self._get_session() as session:
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return session.query(User).all()
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def create_user(self, username, password, **kwargs):
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if not username:
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raise ValueError('Invalid or empty username')
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if not password:
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raise ValueError('Please provide a password for the user')
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with self._get_session(locked=True) as session:
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user = self._get_user(session, username)
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if user:
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raise NameError('The user {} already exists'.format(username))
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record = User(
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username=username,
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password=self._encrypt_password(password),
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created_at=datetime.datetime.utcnow(),
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**kwargs
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)
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session.add(record)
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session.commit()
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user = self._get_user(session, username)
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return self._mask_password(user)
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def update_password(self, username, old_password, new_password):
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with self._get_session(locked=True) as session:
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if not self._authenticate_user(session, username, old_password):
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return False
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user = self._get_user(session, username)
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user.password = self._encrypt_password(new_password)
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session.commit()
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return True
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def authenticate_user(self, username, password):
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with self._get_session() as session:
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return self._authenticate_user(session, username, password)
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def authenticate_user_session(self, session_token):
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with self._get_session() as session:
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user_session = (
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session.query(UserSession)
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.filter_by(session_token=session_token)
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.first()
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)
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if not user_session or (
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user_session.expires_at
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and user_session.expires_at < datetime.datetime.utcnow()
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):
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return None, None
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user = session.query(User).filter_by(user_id=user_session.user_id).first()
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return self._mask_password(user), user_session
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def delete_user(self, username):
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with self._get_session(locked=True) as session:
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user = self._get_user(session, username)
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if not user:
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raise NameError('No such user: {}'.format(username))
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user_sessions = (
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session.query(UserSession).filter_by(user_id=user.user_id).all()
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)
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for user_session in user_sessions:
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session.delete(user_session)
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session.delete(user)
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session.commit()
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return True
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def delete_user_session(self, session_token):
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with self._get_session(locked=True) as session:
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user_session = (
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session.query(UserSession)
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.filter_by(session_token=session_token)
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.first()
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)
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if not user_session:
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return False
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session.delete(user_session)
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session.commit()
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return True
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def create_user_session(self, username, password, expires_at=None):
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with self._get_session(locked=True) as session:
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user = self._authenticate_user(session, username, password)
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if not user:
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return None
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if expires_at:
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if isinstance(expires_at, (int, float)):
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expires_at = datetime.datetime.fromtimestamp(expires_at)
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elif isinstance(expires_at, str):
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expires_at = datetime.datetime.fromisoformat(expires_at)
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user_session = UserSession(
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user_id=user.user_id,
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session_token=self.generate_session_token(),
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csrf_token=self.generate_session_token(),
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created_at=datetime.datetime.utcnow(),
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expires_at=expires_at,
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)
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session.add(user_session)
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session.commit()
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return user_session
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@staticmethod
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def _get_user(session, username):
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return session.query(User).filter_by(username=username).first()
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@staticmethod
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def _encrypt_password(pwd):
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if isinstance(pwd, str):
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pwd = pwd.encode()
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return bcrypt.hashpw(pwd, bcrypt.gensalt(12)).decode()
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@classmethod
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def _check_password(cls, pwd, hashed_pwd):
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return bcrypt.checkpw(cls._to_bytes(pwd), cls._to_bytes(hashed_pwd))
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@staticmethod
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def _to_bytes(data) -> bytes:
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if isinstance(data, str):
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data = data.encode()
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return data
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@staticmethod
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def generate_session_token():
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rand = bytes(random.randint(0, 255) for _ in range(0, 255))
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return hashlib.sha256(rand).hexdigest()
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def get_user_by_session(self, session_token: str):
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"""
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Get a user associated to a session token.
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:param session_token: Session token.
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"""
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with self._get_session() as session:
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return (
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session.query(User)
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.join(UserSession)
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.filter_by(session_token=session_token)
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.first()
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)
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def generate_jwt_token(
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self,
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username: str,
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password: str,
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expires_at: Optional[datetime.datetime] = None,
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) -> str:
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"""
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Create a user JWT token for API usage.
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:param username: User name.
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:param password: Password.
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:param expires_at: Expiration datetime of the token.
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:return: The generated JWT token as a string.
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:raises: :class:`platypush.exceptions.user.InvalidCredentialsException` in case of invalid credentials.
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"""
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user = self.authenticate_user(username, password)
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if not user:
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raise InvalidCredentialsException()
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pub_key, _ = get_or_generate_jwt_rsa_key_pair()
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payload = json.dumps(
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{
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'username': username,
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'created_at': datetime.datetime.now().timestamp(),
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'expires_at': expires_at.timestamp() if expires_at else None,
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},
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sort_keys=True,
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indent=None,
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)
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return base64.b64encode(
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rsa.encrypt(payload.encode('ascii'), pub_key)
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).decode()
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@staticmethod
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def validate_jwt_token(token: str) -> Dict[str, str]:
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"""
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Validate a JWT token.
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:param token: Token to validate.
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:return: On success, it returns the JWT payload with the following structure:
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.. code-block:: json
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{
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"username": "user ID/name",
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"created_at": "token creation timestamp",
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"expires_at": "token expiration timestamp"
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}
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:raises: :class:`platypush.exceptions.user.InvalidJWTTokenException` in case of invalid token.
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"""
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_, priv_key = get_or_generate_jwt_rsa_key_pair()
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try:
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payload = json.loads(
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rsa.decrypt(
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base64.b64decode(token.encode('ascii')),
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priv_key
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).decode('ascii')
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)
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except (TypeError, ValueError) as e:
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raise InvalidJWTTokenException(f'Could not decode JWT token: {e}')
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expires_at = payload.get('expires_at')
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if expires_at and time.time() > expires_at:
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raise InvalidJWTTokenException('Expired JWT token')
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return payload
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def _authenticate_user(self, session, username, password):
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"""
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:return: :class:`platypush.user.User` instance if the user exists and the password is valid, ``None`` otherwise.
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"""
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user = self._get_user(session, username)
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if not user:
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return None
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if not self._check_password(password, user.password):
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return None
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return user
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class User(Base):
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"""Models the User table"""
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__tablename__ = 'user'
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__table_args__ = {'sqlite_autoincrement': True}
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user_id = Column(Integer, primary_key=True)
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username = Column(String, unique=True, nullable=False)
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password = Column(String)
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created_at = Column(DateTime)
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class UserSession(Base):
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"""Models the UserSession table"""
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__tablename__ = 'user_session'
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__table_args__ = {'sqlite_autoincrement': True}
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session_id = Column(Integer, primary_key=True)
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session_token = Column(String, unique=True, nullable=False)
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csrf_token = Column(String, unique=True)
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user_id = Column(Integer, ForeignKey('user.user_id'), nullable=False)
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created_at = Column(DateTime)
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expires_at = Column(DateTime)
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# vim:sw=4:ts=4:et:
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