An AWS Lambda Function template for working with Alexa skills

Lambda Template.py

'''

This is a template for a lambda function, based off the alexa-skills-kit-color-expert-python example

'''

from __future__ import print_function


#Helper functions that build the responses -- don't change these

def build_speech(text_type, body, reprompt, card, should_end_session):

    type_dict = {"PlainText" : "text", "SSML" : "ssml"}

    return {
        'outputSpeech': {
            'type': text_type,
            type_dict[text_type]: body
        },
        'card': card,

        'reprompt': {
            'outputSpeech': {
                'type': text_type,
                type_dict[text_type]: reprompt
            }
        },
        'shouldEndSession': should_end_session
    }

def build_card(title, body):
    return {
        'type' : 'Simple',
        'title' : title,
        'content' : body
    }
def build_response(session_attributes, speechlet_response):
    return {
        'version': '1.0',
        'sessionAttributes': session_attributes,
        'response': speechlet_response
    }

#Functions defined by you that control the skill go here

def session_start(): #Called upon start of skill -- keep this function
    """ If we wanted to initialize the session to have some attributes we could
    add those here
    """

    session_attributes = {}

    card_title = "" #Do change this
    card_body = "" #Do change this
    speech_output = "" #Do change this


    # If the user either does not reply to the welcome message or says something
    # that is not understood, they will be prompted again with this text.

    reprompt_text = "" #Do change this

    should_end_session = False

    card = build_card(card_title, card_body)

    speech = build_speech("change the text type", speech_output, reprompt_text, card, False)

    return build_response(session_attributes, speech)

def session_end(): #Called upon end of skill -- keep this function
    card_title = "" #Do change this
    card_body = "" #Do change this
    speech_output = "" #Do change this

    # Setting this to true ends the session and exits the skill.
    should_end_session = True

    card = build_card(card_title, card_body)

    speech = build_speech("change the text type", speech_output, None, card, False)

    return build_response({}, speech)

#Events that process the Alexa side of things -- don't change these

def on_session_started(session_started_request, session):
    """ Called when the session starts """

    print("on_session_started requestId=" + session_started_request['requestId']
          + ", sessionId=" + session['sessionId'])


def on_launch(launch_request, session):
    """ Called when the user launches the skill without specifying what they
    want
    """

    print("on_launch requestId=" + launch_request['requestId'] +
          ", sessionId=" + session['sessionId'])
    # Dispatch to your skill's launch
    return session_start()

def on_intent(intent_request, session): #Do change this function
    """ Called when the user specifies an intent for this skill """

    print("on_intent requestId=" + intent_request['requestId'] +
          ", sessionId=" + session['sessionId'])

    intent = intent_request['intent']
    intent_name = intent_request['intent']['name']

    #Add functions and intents here
    # Dispatch to your skill's intent handlers

    #if intent_name == "IntentName":
    #   return intent_function(intent, session)

    if intent_name == "AMAZON.HelpIntent":
        return session_start()

    elif intent_name == "AMAZON.CancelIntent" or intent_name == "AMAZON.StopIntent":
        return session_end()

    else:
        raise ValueError("Invalid intent")


def on_session_ended(session_ended_request, session):
    """ Called when the user ends the session.

    Is not called when the skill returns should_end_session=true
    """
    print("on_session_ended requestId=" + session_ended_request['requestId'] +
          ", sessionId=" + session['sessionId'])
    # add cleanup logic here

# Main handler -- don't change this

def lambda_handler(event, context):
    """ Route the incoming request based on type (LaunchRequest, IntentRequest,
    etc.) The JSON body of the request is provided in the event parameter.
    """
    print("event.session.application.applicationId=" +
          event['session']['application']['applicationId'])

    """
    Uncomment this if statement and populate with your skill's application ID to
    prevent someone else from configuring a skill that sends requests to this
    function.
    """
    # if (event['session']['application']['applicationId'] !=
    #         "amzn1.echo-sdk-ams.app.[unique-value-here]"):
    #     raise ValueError("Invalid Application ID")

    if event['session']['new']:
        on_session_started({'requestId': event['request']['requestId']},
                           event['session'])

    if event['request']['type'] == "LaunchRequest":
        return on_launch(event['request'], event['session'])
    elif event['request']['type'] == "IntentRequest":
        return on_intent(event['request'], event['session'])
    elif event['request']['type'] == "SessionEndedRequest":
        return on_session_ended(event['request'], event['session'])