<filename>lambda-function/src/lambda.py
from __future__ import print_function

import requests
import os

SERVER_URL = os.environ.get('SERVER_URL')

# --------------- 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': "Sonos",
            'content': 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
    }


# --------------- 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 Sonos. " \
                    "You can use me to control the Sonos sytem in your house. " \
                    "Start playing on a player, stop the music, or search for new things to play, " \
                    "all with your voice."
    # 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 = "Thanks for playing."
    should_end_session = True
    return build_response(session_attributes, build_speechlet_response(
        card_title, speech_output, reprompt_text, should_end_session))


def handle_session_end_request():
    card_title = "Session Ended"
    speech_output = "Thank you for trying the Alexa Skills Kit sample. " \
                    "Have a nice day! "
    # Setting this to true ends the session and exits the skill.
    should_end_session = True
    return build_response({}, build_speechlet_response(
        card_title, speech_output, None, should_end_session))


def play_anything(intent, session):
    card_title = intent['name']
    session_attributes = {}
    should_end_session = True

    location = None
    if 'Location' in intent['slots']:
        location = intent['slots']['Location'].get('value')

    req = requests.get("{0}/play?location={1}".format(SERVER_URL, location))
    if req.status_code != requests.codes.ok:
        speech_output = "Sorry, I could not connect to sonos to start playing"
        reprompt_text = "I couldnt connect to your sonos. You can try again."
    else:
        speech_output = "Playing"
        reprompt_text = "You can ask me to stop playing."

    return build_response(session_attributes, build_speechlet_response(
        card_title, speech_output, reprompt_text, should_end_session))


def play_something(intent, session):
    card_title = intent['name']
    session_attributes = {}
    should_end_session = True

    location = None
    speech_output = None
    search_term = None
    artist = None
    song = None

    if 'Location' in intent['slots']:
        location = intent['slots']['Location'].get('value')

    if 'WhatToPlay' in intent['slots'] and intent['slots']['WhatToPlay'].get('value') != None:
        search_term = intent['slots']['WhatToPlay']['value']
    else:
        artist = intent['slots']['Artist'].get('value')
        song = intent['slots']['Song'].get('value')

    req = requests.get("{0}/search?query={1}&location={2}&song={3}&artist={4}".format(SERVER_URL, search_term, location, song, artist))
    if req.status_code != requests.codes.ok:
        speech_output = "Sorry, I could not find what you wanted."
    else:
        speech_output = "I will try to play " + \
                        search_term

    reprompt_text = "Try something else?"

    return build_response(session_attributes, build_speechlet_response(
        card_title, speech_output, reprompt_text, should_end_session))


def stop_playing(intent, session):
    session_attributes = {}
    reprompt_text = None
    location = None
    if 'Location' in intent['slots']:
        location = intent['slots']['Location'].get('value')
    req = requests.get("{0}/pause?location={1}".format(SERVER_URL, location))
    if req.status_code != requests.codes.ok:
        speech_output = "Sorry, I could not stop the music"
    else:
        speech_output = ""
    should_end_session = True

    # 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))

def next_song(intent, session):
    session_attributes = {}
    reprompt_text = None
    location = None
    speech_output = None
    should_end_session = True

    if 'Location' in intent['slots']:
        location = intent['slots']['Location'].get('value')
    req = requests.get("{0}/next?location={1}".format(SERVER_URL, location))

    # 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))


def previous_song(intent, session):
    session_attributes = {}
    reprompt_text = None
    location = None
    speech_output = None
    should_end_session = True

    if 'Location' in intent['slots']:
        location = intent['slots']['Location'].get('value')
    req = requests.get("{0}/previous?location={1}".format(SERVER_URL, location))

    # 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))


def volume_adjust(intent, session):
    session_attributes = {}
    reprompt_text = None
    location = None
    speech_output = None
    should_end_session = True

    if 'Location' in intent['slots']:
        location = intent['slots']['Location'].get('value')

    if 'Volume' in intent['slots']:
        volumeup = intent['slots']['Volume'].get('value') == "up"
        req = requests.get("{0}/volume?location={1}&up={2}".format(SERVER_URL, location, volumeup))

    # 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))

# --------------- Events ------------------

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 == "PlayAnything" or intent_name == "AMAZON.ResumeIntent":
        return play_anything(intent, session)
    elif intent_name == "PlaySomething":
        return play_something(intent, session)
    elif intent_name == "StopPlaying" or intent_name == "AMAZON.StopIntent":
        return stop_playing(intent, session)
    elif intent_name == "AMAZON.NextIntent":
        return next_song(intent, session)
    elif intent_name == "AMAZON.PreviousIntent":
        return previous_song(intent, session)
    elif intent_name == "AdjustVolume":
        return volume_adjust(intent, session)
    elif intent_name == "AMAZON.HelpIntent":
        return get_welcome_response()
    elif intent_name == "AMAZON.CancelIntent":
        raise ValueError("Invalid intent")
    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 ------------------

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'])

<filename>lambda-function/src/lambda.py
from __future__ import print_function

import requests
import os

SERVER_URL = os.environ.get('SERVER_URL')

# --------------- 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': "Sonos",
            'content': 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
    }


# --------------- 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 Sonos. " \
                    "You can use me to control the Sonos sytem in your house. " \
                    "Start playing on a player, stop the music, or search for new things to play, " \
                    "all with your voice."
    # 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 = "Thanks for playing."
    should_end_session = True
    return build_response(session_attributes, build_speechlet_response(
        card_title, speech_output, reprompt_text, should_end_session))


def handle_session_end_request():
    card_title = "Session Ended"
    speech_output = "Thank you for trying the Alexa Skills Kit sample. " \
                    "Have a nice day! "
    # Setting this to true ends the session and exits the skill.
    should_end_session = True
    return build_response({}, build_speechlet_response(
        card_title, speech_output, None, should_end_session))


def play_anything(intent, session):
    card_title = intent['name']
    session_attributes = {}
    should_end_session = True

    location = None
    if 'Location' in intent['slots']:
        location = intent['slots']['Location'].get('value')

    req = requests.get("{0}/play?location={1}".format(SERVER_URL, location))
    if req.status_code != requests.codes.ok:
        speech_output = "Sorry, I could not connect to sonos to start playing"
        reprompt_text = "I couldnt connect to your sonos. You can try again."
    else:
        speech_output = "Playing"
        reprompt_text = "You can ask me to stop playing."

    return build_response(session_attributes, build_speechlet_response(
        card_title, speech_output, reprompt_text, should_end_session))


def play_something(intent, session):
    card_title = intent['name']
    session_attributes = {}
    should_end_session = True

    location = None
    speech_output = None
    search_term = None
    artist = None
    song = None

    if 'Location' in intent['slots']:
        location = intent['slots']['Location'].get('value')

    if 'WhatToPlay' in intent['slots'] and intent['slots']['WhatToPlay'].get('value') != None:
        search_term = intent['slots']['WhatToPlay']['value']
    else:
        artist = intent['slots']['Artist'].get('value')
        song = intent['slots']['Song'].get('value')

    req = requests.get("{0}/search?query={1}&location={2}&song={3}&artist={4}".format(SERVER_URL, search_term, location, song, artist))
    if req.status_code != requests.codes.ok:
        speech_output = "Sorry, I could not find what you wanted."
    else:
        speech_output = "I will try to play " + \
                        search_term

    reprompt_text = "Try something else?"

    return build_response(session_attributes, build_speechlet_response(
        card_title, speech_output, reprompt_text, should_end_session))


def stop_playing(intent, session):
    session_attributes = {}
    reprompt_text = None
    location = None
    if 'Location' in intent['slots']:
        location = intent['slots']['Location'].get('value')
    req = requests.get("{0}/pause?location={1}".format(SERVER_URL, location))
    if req.status_code != requests.codes.ok:
        speech_output = "Sorry, I could not stop the music"
    else:
        speech_output = ""
    should_end_session = True

    # 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))

def next_song(intent, session):
    session_attributes = {}
    reprompt_text = None
    location = None
    speech_output = None
    should_end_session = True

    if 'Location' in intent['slots']:
        location = intent['slots']['Location'].get('value')
    req = requests.get("{0}/next?location={1}".format(SERVER_URL, location))

    # 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))


def previous_song(intent, session):
    session_attributes = {}
    reprompt_text = None
    location = None
    speech_output = None
    should_end_session = True

    if 'Location' in intent['slots']:
        location = intent['slots']['Location'].get('value')
    req = requests.get("{0}/previous?location={1}".format(SERVER_URL, location))

    # 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))


def volume_adjust(intent, session):
    session_attributes = {}
    reprompt_text = None
    location = None
    speech_output = None
    should_end_session = True

    if 'Location' in intent['slots']:
        location = intent['slots']['Location'].get('value')

    if 'Volume' in intent['slots']:
        volumeup = intent['slots']['Volume'].get('value') == "up"
        req = requests.get("{0}/volume?location={1}&up={2}".format(SERVER_URL, location, volumeup))

    # 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))

# --------------- Events ------------------

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 == "PlayAnything" or intent_name == "AMAZON.ResumeIntent":
        return play_anything(intent, session)
    elif intent_name == "PlaySomething":
        return play_something(intent, session)
    elif intent_name == "StopPlaying" or intent_name == "AMAZON.StopIntent":
        return stop_playing(intent, session)
    elif intent_name == "AMAZON.NextIntent":
        return next_song(intent, session)
    elif intent_name == "AMAZON.PreviousIntent":
        return previous_song(intent, session)
    elif intent_name == "AdjustVolume":
        return volume_adjust(intent, session)
    elif intent_name == "AMAZON.HelpIntent":
        return get_welcome_response()
    elif intent_name == "AMAZON.CancelIntent":
        raise ValueError("Invalid intent")
    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 ------------------

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'])

# --------------- Helpers that build all of the responses ---------------------- # --------------- Functions that control the skill's behavior ------------------ If we wanted to initialize the session to have some attributes we could
     add those here # 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. # Setting this to true ends the session and exits the skill. # 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. # 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. # 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. # 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. # --------------- Events ------------------ Called when the session starts Called when the user launches the skill without specifying what they
     want # Dispatch to your skill's launch Called when the user specifies an intent for this skill # Dispatch to your skill's intent handlers Called when the user ends the session.
 
     Is not called when the skill returns should_end_session=true # add cleanup logic here # --------------- Main handler ------------------ Route the incoming request based on type (LaunchRequest, IntentRequest,
     etc.) The JSON body of the request is provided in the event parameter. 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")