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Amazon's example Alexa Skills lambda function
"""
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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