awarecan/lambda_function.py

## lambda_function.py
"""
Copyright 2019 Jason Hu <awaregit at gmail.com>

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""
import os
import json
import logging
import urllib3

_debug = bool(os.environ.get('DEBUG'))

_logger = logging.getLogger('HomeAssistant-SmartHome')
_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'

    directive = event.get('directive')
    assert directive is not None, 'Malformatted request - missing directive'
    assert directive.get('header', {}).get('payloadVersion') == '3', \
        'Only support payloadVersion == 3'

    scope = directive.get('endpoint', {}).get('scope')
    if scope is None:
        # token is in payload.scope for Discovery directive
        scope = directive.get('payload', {}).get('scope')
    if scope is None:
        # token is in payload.grantee for AcceptGrant directive
        scope = directive.get('payload', {}).get('grantee')
    assert scope is not None, 'Malformatted request - missing endpoint.scope'
    assert scope.get('type') == 'BearerToken', 'Only support BearerToken'

    token = scope.get('token')
    if token is None and _debug:
        token = os.environ.get('LONG_LIVED_ACCESS_TOKEN')  # only for debug purpose

    verify_ssl = not bool(os.environ.get('NOT_VERIFY_SSL'))

    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/smart_home'.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'))
	"""
	Copyright 2019 Jason Hu <awaregit at gmail.com>

	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License.
	"""
	import os
	import json
	import logging
	import urllib3

	_debug = bool(os.environ.get('DEBUG'))

	_logger = logging.getLogger('HomeAssistant-SmartHome')
	_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'

	directive = event.get('directive')
	assert directive is not None, 'Malformatted request - missing directive'
	assert directive.get('header', {}).get('payloadVersion') == '3', \
	'Only support payloadVersion == 3'

	scope = directive.get('endpoint', {}).get('scope')
	if scope is None:
	# token is in payload.scope for Discovery directive
	scope = directive.get('payload', {}).get('scope')
	if scope is None:
	# token is in payload.grantee for AcceptGrant directive
	scope = directive.get('payload', {}).get('grantee')
	assert scope is not None, 'Malformatted request - missing endpoint.scope'
	assert scope.get('type') == 'BearerToken', 'Only support BearerToken'

	token = scope.get('token')
	if token is None and _debug:
	token = os.environ.get('LONG_LIVED_ACCESS_TOKEN') # only for debug purpose

	verify_ssl = not bool(os.environ.get('NOT_VERIFY_SSL'))

	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/smart_home'.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'))