JWT Auth

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Samuel Marques

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Apr 27, 2020, 11:24:53 AM4/27/20

to cherrypy-users

Hello everyone, I'm new here, so now, here's my presentation: My name is Sam Marxz, I'm 22 years old and I'm a Brazilian Front-End developer with React.

I'm learning about REST API's from the back-end side and as I have a reasonable knowledge of python I decided that it would be a good idea to create an API with a mini framework to really learn how things are done. I chose CherryPy for its simplicity (not like Flask, which is a great framework, but already has a lot ready). I did the CRUD part and everything was OK, but I want to add Authentication and Protection of routes with JWT;

(I couldn't put the text down there.)

- How can I pass information to the route via Tool ?

- The code is OK ? Am I doing it right?

- How to pass the db to the tool to check

Thanks in advance

Here's the code:

app.py

import os
import cherrypy

from cp_sqlalchemy import SQLAlchemyTool, SQLAlchemyPlugin

from models import Base
from resources import LoginResource, UserResource, WebsiteResource



HERE = os.path.dirname(os.path.abspath(__file__))


if __name__ == '__main__':
    cherrypy.tools.db = SQLAlchemyTool()

    conf = {
        '/': {
            'request.dispatch': cherrypy.dispatch.MethodDispatcher(),
            'tools.response_headers.on': True,
            'tools.db.on': True,
            'tools.response_headers.headers': [
                ('Content-Type', 'application/json')
            ],
        }
    }
    
    cherrypy.tree.mount(LoginResource(), '/api/login', config=conf)
    cherrypy.tree.mount(UserResource(), '/api/user', config=conf)
    cherrypy.tree.mount(WebsiteResource(), '/api/websites', config=conf)

    dbfile = os.path.join(HERE, 'test.db')

    if not os.path.exists(dbfile):
        open(dbfile, 'w+').close()

    sqlalchemy_plugin = SQLAlchemyPlugin(
        cherrypy.engine, Base, 'sqlite:///%s' % (dbfile),
        echo=True
    )

    sqlalchemy_plugin.subscribe()
    sqlalchemy_plugin.create()
    cherrypy.engine.start()
    cherrypy.engine.block()

tools.py

import jwt
import cherrypy

from models import User
from config import SECRET_KEY


@cherrypy.tools.register('before_handler')
def check_jwt():
    token = cherrypy.request.headers.get('authorization').split(' ')[1]

    if not token:
        raise cherrypy.HTTPError(400, 'You must provide JWT token')

    try:
        info = jwt.decode(token, SECRET_KEY, algorithm='HS256')
    except jwt.ExpiredSignatureError:
        raise cherrypy.HTTPError(400, 'Token expirado')
    except jwt.DecodeError:
        raise cherrypy.HTTPError(400, 'Token inválido')
    except:
        raise cherrypy.HTTPError(500, 'Error in System')
    else:
        # CHECK  IN DATABASE IF PAYLOAD IS OK AND RETURN TO ROUTE

resources.py

import jwt
import datetime
import cherrypy

from models import Website, User
from config import SECRET_KEY
from tools import check_jwt

class BaseResource(object):
    @property
    def db(self):
        return cherrypy.request.db


@cherrypy.expose
class UserResource(BaseResource):
    @cherrypy.tools.json_in()
    @cherrypy.tools.json_out()
    def POST(self):
        """Register new user"""
        username = cherrypy.request.json.get('username')
        password = cherrypy.request.json.get('password')

        if not username or not password:
            raise cherrypy.HTTPError(400, 'Username and Password are required')

        if self.db.query(User).filter_by(username=username).first():
            raise cherrypy.HTTPError(400, 'User already exists')

        try:
            self.db.add(User(username=username, password=User.generate_hash(password)))
            self.db.commit()
            pay_load = {
                'username': username,
                'exp': datetime.datetime.utcnow() + datetime.timedelta(days=1)
            }
            access_token = jwt.encode(pay_load, SECRET_KEY, algorithm='HS256')
            return {
                'message': 'User {} was created'.format(username),
                'access_token': 'Bearer {}'.format(access_token.decode('utf-8'))
            }
        except:
            raise cherrypy.HTTPError(500, {'message': 'Something went wrong'})


@cherrypy.expose
class LoginResource(BaseResource):
    @cherrypy.tools.json_in()
    @cherrypy.tools.json_out()
    def POST(self):
        """Login user"""
        username = cherrypy.request.json.get('username')
        password = cherrypy.request.json.get('password')

        if not username or not password:
            raise cherrypy.HTTPError(400, 'Username and Password are required')

        current_user = self.db.query(User).filter_by(username = username).first()

        if not current_user:
            raise cherrypy.HTTPError(404, 'User not found')

        if User.verify_hash(password, current_user.password):
            pay_load = {
                'username': current_user.username,
                'exp': datetime.datetime.utcnow() + datetime.timedelta(days=1)
            }
            access_token = jwt.encode(pay_load, SECRET_KEY, algorithm='HS256')
            return {
                'message': 'Logged in as {}'.format(current_user.username),
                'access_token': 'Bearer {}'.format(access_token.decode('utf-8'))
            }
        else:
            return {'message': 'Invalid username or password'}


@cherrypy.expose
class WebsiteResource(BaseResource):
    @cherrypy.tools.json_out()
    def GET(self):
        websites = self.db.query(Website).all()
        return {"websites": [website.to_dict() for website in websites]}

    @cherrypy.tools.json_in()
    @cherrypy.tools.json_out()
    @cherrypy.tools.check_jwt()
    def POST(self):
        """ 
            I Want check JWT Token before enter's here.
            Protect this Route
         """
        title = cherrypy.request.json.get('title')
        url = cherrypy.request.json.get('url')

        self.db.add(Website(title = title, url = url))
        self.db.commit()

        return {'message': 'Website {} created!'.format(title)}

    @cherrypy.tools.json_in()
    @cherrypy.tools.json_out()
    def PUT(self, id):
        title = cherrypy.request.json.get('title')
        url = cherrypy.request.json.get('url')

        # self.db.update(Website).values(title=title, url=url).where(id=id)
        self.db.query(Website).filter_by(id=id).update({"title":title, "url": url})

        return {'message': 'Website {} updated!'.format(title)}

    @cherrypy.tools.json_out()
    def DELETE(self, id):
        self.db.query(Website).filter_by(id=id).delete()
        return {'message': 'Deleted!'}

models.py

from sqlalchemy import Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from passlib.hash import pbkdf2_sha256 as sha256

from sqlalchemy_serializer import SerializerMixin


Base = declarative_base()


class User(Base, SerializerMixin):
    __tablename__ = 'users'

    id = Column(Integer, primary_key=True)
    username = Column(String(60), unique=True, nullable=False)
    password = Column(String(120), nullable=False)

    @staticmethod
    def generate_hash(password):
        return sha256.hash(password)

    @staticmethod
    def verify_hash(password, hash):
        return sha256.verify(password, hash)


class Website(Base, SerializerMixin):
    __tablename__ = 'websites'

    id = Column(Integer, primary_key=True)
    title = Column(String(120))
    url = Column(String(100))

    def __repr__(self):
        return f"Website {self.title}"

Valera Malinovsky

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Aug 16, 2020, 5:33:32 AM8/16/20

to cherrypy-users

Hello

I'm also interested in how to pass user information between requests

Valera Malinovsky

unread,

Aug 16, 2020, 5:49:09 AM8/16/20

to cherrypy-users

import cherrypy

@cherrypy.tools.register('before_handler')
def required_user():
cherrypy.request.user = 'Sam Marxz'

class Root:
@cherrypy.expose
@cherrypy.tools.required_user()
def index(self):