AWS Lambda function for forwarding Alexa Intent requests to Home Assistant

example_hass_alexa_intents_lambda_function.py

# -*- coding: utf-8 -*-
import os
import json
import logging
import urllib3

_debug = os.environ.get('DEBUG', '').lower() in ('1', 'y', 'yes', 'true', 'on')

_logger = logging.getLogger('HomeAssistant-Intents')
_logger.setLevel(logging.DEBUG if _debug else logging.INFO)


def lambda_handler(event, context):
    """Handle incoming Alexa directive."""

    _logger.debug('Event: %s', event)

    base_url = os.environ.get('BASE_URL')
    assert base_url is not None, 'Please set BASE_URL environment variable'

    try:
        token = event.get('session', {}).get('user', {}).get('accessToken')
    except AttributeError:
        token = None

    if token is None and _debug:
        token = os.environ.get('LONG_LIVED_ACCESS_TOKEN')

    assert token, 'Could not get access token'

    verify_ssl = os.environ.get('NOT_VERIFY_SSL', '').lower() not in ('1', 'y', 'yes', 'true', 'on')

    http = urllib3.PoolManager(
        cert_reqs='CERT_REQUIRED' if verify_ssl else 'CERT_NONE',
        timeout=urllib3.Timeout(connect=2.0, read=10.0)
    )

    response = http.request(
        'POST',
        '{}/api/alexa'.format(base_url),
        headers={
            'Authorization': 'Bearer {}'.format(token),
            'Content-Type': 'application/json',
        },
        body=json.dumps(event).encode('utf-8'),
    )
    if response.status >= 400:
        return {
            'event': {
                'payload': {
                    'type': 'INVALID_AUTHORIZATION_CREDENTIAL'
                    if response.status in (401, 403) else 'INTERNAL_ERROR',
                    'message': response.data.decode("utf-8"),
                }
            }
        }
    return json.loads(response.data.decode('utf-8'))

Hello

I have been using “haaska” to achieve this and I recently switched my ISP and they use CG-NAT so port forwarding is not an option. I am force to use IPv6 . I got the IPv6 working with duckdns and letsencrypt.
So my question is will this work on IPv6 as well because “haaska” does not work .

Hello

I have been using “haaska” to achieve this and I recently switched my ISP and they use CG-NAT so port forwarding is not an option. I am force to use IPv6 . I got the IPv6 working with duckdns and letsencrypt. So my question is will this work on IPv6 as well because “haaska” does not work .

It's just using urllib3 so assuming you've got IPv6 set up properly in your OS it should work fine.

@lpomfrey Hi, I'm using your script and it is working fine in debug with a long live access token, tanks. But as soon as I remove the debug flag I get an ssl error

SSLError(CertificateError("hostname 'www.XXX.duckdns.org' doesn't match 'XXX.duckdns.org'"))': /api/alexa/smart_home

I have no idea how to fix this. I am using the generated duckdns addon certificate of my home assistant.

Could you please help?

@lpomfrey Hi, I'm using your script and it is working fine in debug with a long live access token, tanks. But as soon as I remove the debug flag I get an ssl error

SSLError(CertificateError("hostname 'www.XXX.duckdns.org' doesn't match 'XXX.duckdns.org'"))': /api/alexa/smart_home

I have no idea how to fix this. I am using the generated duckdns addon certificate of my home assistant.

Could you please help?

It looks like you either need to set the NOT_VERIFY_SSL environment variable to 1 or use a domain that you actually have a certificate for (e.g. XXX.duckdns.org instead of www.XXX.duckdns.org)

@lpomfrey Thank you for your quick response. Now I am getting

{
  "errorMessage": "Could not get access token",
  "errorType": "AssertionError",
  "requestId": "63bf8698-793d-4cda-b812-8ca42095cdc1",
  "stackTrace": [
    "  File \"/var/task/lambda_function.py\", line 29, in lambda_handler\n    assert token, 'Could not get access token'\n"
  ]
}

My home assistant is accessible via https and port 443.

---

I figured it out. There is no user / token in the event. I am not sure why. I will see what is wrong because I am sure I've added account linking in my alexa skil.

---

@lpomfrey

I have kinda figured it out. The script is different for me. My token is not in token = event.get('session', {}).get('user', {}).get('accessToken'). For me it is in token = event.get('directive', {}).get('payload', {}).get('scope', {}).get('token').

But I could not find a solution for the verify ssl error. Even if I disable verify ssl...

Unverified HTTPS request is being made to host 'www.XXX.duckdns.org'. Adding certificate verification is strongly advised.

@lpomfrey Thank you for your quick response. Now I am getting

{
  "errorMessage": "Could not get access token",
  "errorType": "AssertionError",
  "requestId": "63bf8698-793d-4cda-b812-8ca42095cdc1",
  "stackTrace": [
    "  File \"/var/task/lambda_function.py\", line 29, in lambda_handler\n    assert token, 'Could not get access token'\n"
  ]
}

My home assistant is accessible via https and port 443.

I figured it out. There is no user / token in the event. I am not sure why. I will see what is wrong because I am sure I've added account linking in my alexa skil.

@lpomfrey

I have kinda figured it out. The script is different for me. My token is not in token = event.get('session', {}).get('user', {}).get('accessToken'). For me it is in token = event.get('directive', {}).get('payload', {}).get('scope', {}).get('token').

But I could not find a solution for the verify ssl error. Even if I disable verify ssl...

Unverified HTTPS request is being made to host 'www.XXX.duckdns.org'. Adding certificate verification is strongly advised.

It sounds like you might want to modify this script instead from the Home Assistant docs here

The SSL issue is just a warning that you're insecure because you turned off certificate verification.