from flask import Flask, request, jsonify, json
from flask_restful import Resource, Api
import requests
from decouple import config
from pyotp import TOTP

app = Flask(__name__)
api = Api(app)


def check_otp(name, realm, token):
    data = {
        "auth_name": config('AUTH_NAME', ''),
        "auth_token": TOTP(config('AUTH_SEED', '')).now(),
        "auth_realm": config('AUTH_REALM', ''),
        "name": name,
        "realm": realm,
        "token": token
    }
    response = requests.post(
        "https://{OTP_SERVER}{OTP_VERIFY_ENDPOINT}".format(
            OTP_SERVER=config('OTP_SERVER', ''),
            OTP_VERIFY_ENDPOINT=config('OTP_VERIFY_ENDPOINT', '/ungleichotp/verify/')
        ),
        data=data
    )
    return response.status_code


class MainView(Resource):
    def get(self):
        return jsonify({'Detail': 'This view is open to users'})


class ProtectedView(Resource):
    def post(self):
        data = request.get_json()
        if data is not None:
            try:
                user = data['name']
                realm = data['realm']
                token = data['token']
                assert(realm == config('REALM_ALLOWED'))
                code = check_otp(user, realm, token)
                assert(code == 200)
            except (KeyError, AssertionError) as e:
                response = app.response_class(response=json.dumps({'Message': 'Invalid data'}),
                                              status=400,
                                              mimetype='application/json')
                return response

            response = app.response_class(response=json.dumps({'data sent': data}),
                                          status=200,
                                          mimetype='application/json')
            return response
        else:
            return app.response_class(response=json.dumps({'Message': 'invalid request'}),
                               status=400,
                               mimetype='application/json')


api.add_resource(MainView, '/')
api.add_resource(ProtectedView, '/protected')

if __name__ == '__main__':
    app.run(host='::')