dialogflow-google-sign-in-java

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dialogflow-google-sign-in-java

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Google Sign-In sample (using Dialogflow) in Java

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# Actions on Google: Account Linking with Google Sign-In Sample

This sample demonstrates Actions on Google features for use on Google Assistant including account linking and [Google Sign In](https://developers.google.com/assistant/identity/google-sign-in) -- using the [Java client library](https://github.com/actions-on-google/actions-on-google-java), [Firebase Authentication](https://firebase.google.com/docs/auth/), and deployed on [App Engine](https://cloud.google.com/appengine/docs/standard/java/quickstart).

### Setup Instructions
### Prerequisites
1. Download & install the [Google Cloud SDK](https://cloud.google.com/sdk/docs/)
1. [Gradle with App Engine Plugin](https://cloud.google.com/appengine/docs/flexible/java/using-gradle)
   + Run `gcloud auth application-default login` with your Google account
   + Install and update the App Engine component,`gcloud components install app-engine-java`
   + Update other components, `gcloud components update`

### Configuration
#### Actions Console
1. From the [Actions on Google Console](https://console.actions.google.com/), New project (this will become your *Project ID*) > **Create project** > under **More options** > **Conversational**.
1. From the top navigation menu under **Develop** > **Account linking** (left nav):
   + **Account creation** > select `Yes, allow users to sign up for new accounts via voice`.
   + **Linking type** > select `Google Sign In`.
   + **Client information** > copy **Client ID** > **Save**.
1. In `src/main/java/com/example/Constants.java`
   + Update `clientId` to the value copied in the previous step
   + Update `databaseUrl` to `https://<YOUR-PROJECT-ID>.firebaseio.com` with your *Project ID*.
1. From the top navigation menu under **Develop** > **Actions** (left nav) > **Add your first action** > **BUILD** (this will bring you to the Dialogflow console) > Select language and time zone > **CREATE**.
1. In Dialogflow, go to **Settings** ⚙ > **Export and Import** > **Restore from zip**.
   + Follow the directions to restore from the `agent.zip` file in this repo.

### Firestore Database
1. From the [Firebase console](https://console.firebase.google.com), find and select your Actions on Google Project ID
1. In the left navigation menu under **Develop** section > **Database** > **Create database** button > Select **Start in test mode** > **Enable**
1. Under **Develop** > **Authentication** > **Sign in method** tab > **Sign In Providers**:
   + Select **Google** > **Enable**
   + **Web SDK configuration** section > copy the **Web client ID** value and replace the `<CLIENT-ID>` placeholder string found in `src/main/webapp/webapp.html` with your web client ID.
   + Then **Save**
1. **Project Overview** > under **Add Firebase to your app** > select the **web icon** > copy the config contents into `src/main/webapp/webapp.html`

#### App Engine Deployment & Webhook Configuration
1. Configure the gcloud CLI and set your Google Cloud project to the name of your Actions on Google Project ID, which you can find from the [Actions on Google console](https://console.actions.google.com/) under Settings ⚙
   + `gcloud init`
1. Deploy to [App Engine using Gradle](https://cloud.google.com/appengine/docs/flexible/java/using-gradle):
   + `gradle appengineDeploy` OR
   +  From within IntelliJ, open the Gradle tray and run the appEngineDeploy task.

#### Dialogflow Console
Return to the [Dialogflow Console](https://console.dialogflow.com), from the left navigation menu under **Fulfillment** > **Enable Webhook**, set the value of **URL** to `https://<YOUR_PROJECT_ID>.appspot.com` > **Save**.
1. From the left navigation menu, click **Integrations** > **Integration Settings** under Google Assistant > Enable **Auto-preview changes** >  **Test** to open the Actions on Google simulator then say or type `Talk to my test app`.

### Configure Google Sign-In Credentials
1. In the Google Cloud Console [Credentials](https://console.cloud.google.com/apis/credentials) page > select your *Project ID* from the dropdown.
1. From the **OAuth consent screen** tab > under **Authorized domains** > add the domain for your deployed project, `<YOUR-PROJECT-ID>.appspot.com` > **Save**.
1. Back in the **Credentials** tab > **OAuth 2.0 client IDs** > select **Web client (auto created by Google Service)**:
    + Under **Authorized JavaScript origins**, add `https://<YOUR-PROJECT-ID>.appspot.com` with your *Project ID*.
    + Under **Authorized redirect URI**, add `https://<YOUR-PROJECT-ID>.appspot.com/webapp.html` with your *Project ID* > **Save**.

### Running this Sample
+ You can test your Action on any Google Assistant-enabled device on which the Assistant is signed into the same account used to create this project. Just say or type, “OK Google, talk to my test app”.
+ You can also use the Actions on Google Console simulator to test most features and preview on-device behavior.
+ A minimal web application is published at `https://<YOUR-PROJECT-ID>.appspot.com/webapp.html`, you can see the favorite color value.

### Troubleshooting
+ If running into issues after following the above steps, clear your browser's cache and make sure pop ups are allowed.

### References & Issues
+ Questions? Go to [StackOverflow](https://stackoverflow.com/questions/tagged/actions-on-google), [Assistant Developer Community on Reddit](https://www.reddit.com/r/GoogleAssistantDev/) or [Support](https://developers.google.com/assistant/support).
+ For bugs, please report an issue on Github.
+ Actions on Google [Documentation](https://developers.google.com/assistant)
+ [Webhook Boilerplate Template](https://github.com/actions-on-google/dialogflow-webhook-boilerplate-java) for Actions on Google.
+ More info about [Gradle & the App Engine Plugin](https://cloud.google.com/appengine/docs/flexible/java/using-gradle).
+ More info about deploying [Java apps with App Engine](https://cloud.google.com/appengine/docs/standard/java/quickstart).

### Make Contributions
Please read and follow the steps in the [CONTRIBUTING.md](CONTRIBUTING.md).

### License
See [LICENSE](LICENSE).

### Terms
Your use of this sample is subject to, and by using or downloading the sample files you agree to comply with, the [Google APIs Terms of Service](https://developers.google.com/terms/).

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