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This project is a demonstration about how to use multivocal to do authentication with the Auth0 service and Actions on Google.

Before you code

Before you begin coding, there is a bit of setup you'll need to do


  • A project in the Action Console.
  • An account and project on Auth0.
  • We will use Firebase Cloud Functions
    • Since we are doing network calls, this requires a paid plan.
    • Changes for Google Cloud Functions, AWS Lambda, or other node.js hosting platforms are minimal. See multivocal documentation for details.
  • For this example, check the project out from github: git clone

Setup Auth0

  1. In Auth0, you will either need to use an existing Tenant, or create a new one. The Tenant is the logical isolation unit for Auth0 projects and helps form the OAuth Domain Name tht is used. If you have an existing web or mobile app that your Action will be working with, they should share the same Tenant. If you're creating a new project, it should be a new Tenant.

    Creating a Tenant

  2. From your Dashboard, click the button to create a new application

    New Application

    and then fill in the name of the application. This will be displayed to the user, but can be changed later. Then select a "Regular Web Application" and click the create button.

    Create Application

  3. You'll be placed on the Quick Start page for the application you just created. Click on the "Settings" tab for the application instead.

    You will need some of these settings when we setup the Action in the Actions Console shortly and you'll need to make one configuration change.

    At the top of the settings page, you'll need the "Client ID" and "Client Secret".

    Client ID and Secret

    Towards the middle of the page, you'll need to set the "Allowed Callback URLs" to a URL that includes your Actions on Google project ID:

    Allowed Callback URLs

    We will also need to get the URLs that are located under the Advanced Settings by going to the bottom of the page and clicking on the "Advanced Settings" link.

    Advanced Settings

    In the Advanced Settings page, select the Endpoints tab and get the "OAuth Authorization URL" and "OAuth Token URL"

    OAuth Authorization and Token URLs

  4. Make sure you have social connections enabled to allow people to login using different login providers. Select "Connections" and then "Social" on the left navigation. Make sure at least one of the providers is on - we've selected Google in this example.

    Connections Social

Setup Actions on Google

  1. In the Actions on Google console, you'll select the Account linking left navigation (possibly scrolling to the bottom to get to it).

    Account linking

  2. Expand the Account Creation section and set "No, I only want to allow account creation on my website". This will actually mean that they need to log into Auth0 to create the account.

    Account Creation

  3. Expand the Linking Type section and make sure that "OAuth" and "Authorization code" are selected.

    Linking type

  4. Expand the Client Information section and set the "Client ID", "Client Secret", "Authorization URL", and "Token URL" from the Auth0 setting screens we collected in step 3 of the Auth0 instructions above.

    Client Information

  5. Expand the Configure your Client section and set the following scopes (one per block)

    • profile
    • email
    • openid
    • offline_access

    Configure your Client

  6. In the Testing Instructions section, you will need to provide information to Google's review team before they approve your Action. This should include a test account you've created for them to use.

    You have to put something in this field for now.

    Testing Instructions

Write and Configure your Action

The Action is a fairly simple one. After starting, you'll be prompted if you want to hear the name or the email address that it has for you. So our two intents are


Additional Dialogflow intents

Make sure you have already loaded the multivocal standard intents.

To load the additional intents for this Action, click on the gear to open the project settings and select "Export and Import" then "Import From ZIP".

IMPORTANT Make sure you "Import" the zip file, not "Restore". Importing the file will add it to other intents that are already defined.

Settings screen

The intents to import are under dialogflow/ Select this, type "IMPORT" into the text field, and click on the "Import" button. Then save.

Settings screen


Turning to the code, our index file is fairly straightforward and minimalist. Most of the work will be done in the config.js file, which gets initialized here.

const Multivocal = require('multivocal');


exports.webhook = Multivocal.processFirebaseWebhook;


Before we look at the config, we'll look at this separate auth0.js file. You don't need to edit anything in the file, in fact, you can copy it directly to your own projects and reuse it unchanged, but it is useful to look at to see how it works.

We can see that it comes with a simple configuration. In this case, it is an environment setting for the URL to use to get user information: Config/Setting/auth0/userinfoUrl.

But this value is, itself, a template, that references Config/Setting/auth0/tenant, which is not defined in this file. We'll need to provide it ourselves in the configuration since this is distinct per project. We could also provide the whole URL by setting Config/Setting/auth0/userinfoUrl, but this is only necessary if we customize it in auth0.

We also see that it registers a builder. If we get an access token from Google, then we'll request the user information from auth0 for this token. If it succeeds, we'll store this in the environment under User/Profile.


The important bits are all in the configuration file. We won't go into everything, but a few important things to note.

In multivocal, we say that it is a "reqiurement" to be authenticated before we get the results for some intents. So we define them in the configuration under Local/und/Requirements. Requirements can be localized, although they often aren't, so we include them in the "und" section.

We have two intents that need the user to be authenticated, "" and "". So our requirements section includes them and says that the environment setting User/IsAuthenticated must be set.

  "": "User/IsAuthenticated",
  "":  "User/IsAuthenticated"

User/IsAuthenticated will only be set if either the auth token or the identity token have been set, and multivocal knows to prompt the user to sign in to get this set.

In our responses, we'll include values from the User/Profile environment setting, which is set by the auth0 builder.

  "": [
    "Your email address is {{}}."
  "": [
    "Your name is {{}}."

We also need to set Config/Setting/auth0/tenant so the auth0 module knows which to use when fetching user info.

      tenant: 'multivocal-example-auth0'

And finally, of course, we need to initialize the auth0 component.

Trying it out

Since we are doing account linking that requires OAuth, we need to try it out on a phone. (We can try it on our speaker, like Google Home, but it will say that we need to complete it on the phone anyway.)

We start the Action by explicitly asking for it, and then asking for my name.

Since our account isn't yet linked, it asks for permission to begin the linking process.

Start account linking

We can say or click on "Yes", which will open a web page attached to this Auth0 tenant. We'll select the "Login with Google" button and do any login tasks that may be necessary.

Login on Auth0

Once login is complete, we're redicted back to the Assistant, which completes the login and sends the auth token to our Action. Since multivocal now gets the auth token, it gets the profile information, determines the response for the intent we originally wanted, and handles that response.


If we quit the Action and start over, we'll see that the Assistant still knows who we are. So when we ask for our name, it doesn't require that we log in.

Subsequent invocations


Demonstrating how to do authentication with Actions on Google, multivocal, and Auth0







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