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June 20, 2017 11:15
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Amazon's example Alexa Skills lambda function
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""" | |
This sample demonstrates a simple skill built with the Amazon Alexa Skills Kit. | |
The Intent Schema, Custom Slots, and Sample Utterances for this skill, as well | |
as testing instructions are located at http://amzn.to/1LzFrj6 | |
For additional samples, visit the Alexa Skills Kit Getting Started guide at | |
http://amzn.to/1LGWsLG | |
""" | |
from __future__ import print_function | |
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']) | |
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 get_welcome_response() | |
def on_intent(intent_request, session): | |
""" 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'] | |
# Dispatch to your skill's intent handlers | |
if intent_name == "MyColorIsIntent": | |
return set_color_in_session(intent, session) | |
elif intent_name == "WhatsMyColorIntent": | |
return get_color_from_session(intent, session) | |
elif intent_name == "AMAZON.HelpIntent": | |
return get_welcome_response() | |
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 | |
# --------------- Functions that control the skill's behavior ------------------ | |
def get_welcome_response(): | |
""" If we wanted to initialize the session to have some attributes we could | |
add those here | |
""" | |
session_attributes = {} | |
card_title = "Welcome" | |
speech_output = "Welcome to the Alexa Skills Kit sample. " \ | |
"Please tell me your favorite color by saying, " \ | |
"my favorite color is red" | |
# 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 = "Please tell me your favorite color by saying, " \ | |
"my favorite color is red." | |
should_end_session = False | |
return build_response(session_attributes, build_speechlet_response( | |
card_title, speech_output, reprompt_text, should_end_session)) | |
def set_color_in_session(intent, session): | |
""" Sets the color in the session and prepares the speech to reply to the | |
user. | |
""" | |
card_title = intent['name'] | |
session_attributes = {} | |
should_end_session = False | |
if 'Color' in intent['slots']: | |
favorite_color = intent['slots']['Color']['value'] | |
session_attributes = create_favorite_color_attributes(favorite_color) | |
speech_output = "I now know your favorite color is " + \ | |
favorite_color + \ | |
". You can ask me your favorite color by saying, " \ | |
"what's my favorite color?" | |
reprompt_text = "You can ask me your favorite color by saying, " \ | |
"what's my favorite color?" | |
else: | |
speech_output = "I'm not sure what your favorite color is. " \ | |
"Please try again." | |
reprompt_text = "I'm not sure what your favorite color is. " \ | |
"You can tell me your favorite color by saying, " \ | |
"my favorite color is red." | |
return build_response(session_attributes, build_speechlet_response( | |
card_title, speech_output, reprompt_text, should_end_session)) | |
def create_favorite_color_attributes(favorite_color): | |
return {"favoriteColor": favorite_color} | |
def get_color_from_session(intent, session): | |
session_attributes = {} | |
reprompt_text = None | |
if "favoriteColor" in session.get('attributes', {}): | |
favorite_color = session['attributes']['favoriteColor'] | |
speech_output = "Your favorite color is " + favorite_color + \ | |
". Goodbye." | |
should_end_session = True | |
else: | |
speech_output = "I'm not sure what your favorite color is. " \ | |
"You can say, my favorite color is red." | |
should_end_session = False | |
# Setting reprompt_text to None signifies that we do not want to reprompt | |
# the user. If the user does not respond or says something that is not | |
# understood, the session will end. | |
return build_response(session_attributes, build_speechlet_response( | |
intent['name'], speech_output, reprompt_text, should_end_session)) | |
# --------------- Helpers that build all of the responses ---------------------- | |
def build_speechlet_response(title, output, reprompt_text, should_end_session): | |
return { | |
'outputSpeech': { | |
'type': 'PlainText', | |
'text': output | |
}, | |
'card': { | |
'type': 'Simple', | |
'title': 'SessionSpeechlet - ' + title, | |
'content': 'SessionSpeechlet - ' + output | |
}, | |
'reprompt': { | |
'outputSpeech': { | |
'type': 'PlainText', | |
'text': reprompt_text | |
} | |
}, | |
'shouldEndSession': should_end_session | |
} | |
def build_response(session_attributes, speechlet_response): | |
return { | |
'version': '1.0', | |
'sessionAttributes': session_attributes, | |
'response': speechlet_response | |
} |
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