devicehub-teal/ereuse_devicehub/modules/oidc/oauth2.py

from authlib.integrations.flask_oauth2 import (
    AuthorizationServer as _AuthorizationServer,
)
from authlib.integrations.flask_oauth2 import ResourceProtector
from authlib.integrations.sqla_oauth2 import (
    create_bearer_token_validator,
    create_query_client_func,
    create_save_token_func,
)
from authlib.oauth2.rfc6749.grants import (
    AuthorizationCodeGrant as _AuthorizationCodeGrant,
)
from authlib.oidc.core import UserInfo
from authlib.oidc.core.grants import OpenIDCode as _OpenIDCode
from authlib.oidc.core.grants import OpenIDHybridGrant as _OpenIDHybridGrant
from authlib.oidc.core.grants import OpenIDImplicitGrant as _OpenIDImplicitGrant
from decouple import config
from werkzeug.security import gen_salt

from ereuse_devicehub.db import db
from ereuse_devicehub.resources.user.models import User

from .models import OAuth2AuthorizationCode, OAuth2Client, OAuth2Token

DUMMY_JWT_CONFIG = {
    'key': config('SECRET_KEY'),
    'alg': 'HS256',
    'iss': config("HOST", 'https://authlib.org'),
    'exp': 3600,
}


def exists_nonce(nonce, req):
    exists = OAuth2AuthorizationCode.query.filter_by(
        client_id=req.client_id, nonce=nonce
    ).first()
    return bool(exists)


def generate_user_info(user, scope):
    if 'rols' in scope:
        rols = user.rols_dlt and user.get_rols_dlt() or []
        return UserInfo(rols=rols, sub=str(user.id), name=user.email)
    return UserInfo(sub=str(user.id), name=user.email)


def create_authorization_code(client, grant_user, request):
    code = gen_salt(48)
    nonce = request.data.get('nonce')
    item = OAuth2AuthorizationCode(
        code=code,
        client_id=client.client_id,
        redirect_uri=request.redirect_uri,
        scope=request.scope,
        user_id=grant_user.id,
        nonce=nonce,
        member_id=client.member_id,
    )
    db.session.add(item)
    db.session.commit()
    return code


class AuthorizationCodeGrant(_AuthorizationCodeGrant):
    def create_authorization_code(self, client, grant_user, request):
        return create_authorization_code(client, grant_user, request)

    def parse_authorization_code(self, code, client):
        item = OAuth2AuthorizationCode.query.filter_by(
            code=code, client_id=client.client_id
        ).first()
        if item and not item.is_expired():
            return item

    def delete_authorization_code(self, authorization_code):
        db.session.delete(authorization_code)
        db.session.commit()

    def authenticate_user(self, authorization_code):
        return User.query.get(authorization_code.user_id)

    def save_authorization_code(self, code, request):
        if not request.data.get('consent'):
            return code

        item = OAuth2AuthorizationCode(
            code=code,
            client_id=request.client.client_id,
            redirect_uri=request.redirect_uri,
            scope=request.scope,
            user_id=request.user.id,
            nonce=request.data.get('nonce'),
            member_id=request.client.member_id,
        )
        db.session.add(item)
        db.session.commit()
        return code

    def query_authorization_code(self, code, client):
        return OAuth2AuthorizationCode.query.filter_by(
            code=code, client_id=client.client_id
        ).first()


class OpenIDCode(_OpenIDCode):
    def exists_nonce(self, nonce, request):
        return exists_nonce(nonce, request)

    def get_jwt_config(self, grant):
        return DUMMY_JWT_CONFIG

    def generate_user_info(self, user, scope):
        return generate_user_info(user, scope)


class ImplicitGrant(_OpenIDImplicitGrant):
    def exists_nonce(self, nonce, request):
        return exists_nonce(nonce, request)

    def get_jwt_config(self, grant):
        return DUMMY_JWT_CONFIG

    def generate_user_info(self, user, scope):
        return generate_user_info(user, scope)


class HybridGrant(_OpenIDHybridGrant):
    def create_authorization_code(self, client, grant_user, request):
        return create_authorization_code(client, grant_user, request)

    def exists_nonce(self, nonce, request):
        return exists_nonce(nonce, request)

    def get_jwt_config(self):
        return DUMMY_JWT_CONFIG

    def generate_user_info(self, user, scope):
        return generate_user_info(user, scope)


class AuthorizationServer(_AuthorizationServer):
    def validate_consent_request(self, request=None, end_user=None):
        return self.get_consent_grant(request=request, end_user=end_user)

    def save_token(self, token, request):
        token['member_id'] = request.client.member_id
        return super().save_token(token, request)


authorization = AuthorizationServer()
require_oauth = ResourceProtector()


def config_oauth(app):
    query_client = create_query_client_func(db.session, OAuth2Client)
    save_token = create_save_token_func(db.session, OAuth2Token)
    authorization.init_app(app, query_client=query_client, save_token=save_token)

    # support all openid grants
    authorization.register_grant(
        AuthorizationCodeGrant,
        [
            OpenIDCode(require_nonce=True),
        ],
    )
    authorization.register_grant(ImplicitGrant)
    authorization.register_grant(HybridGrant)

    # protect resource
    bearer_cls = create_bearer_token_validator(db.session, OAuth2Token)
    require_oauth.register_token_validator(bearer_cls())