.NET quickstart for customers

  • This quickstart guide helps you create a simple .NET C# console application that interacts with the zero-touch enrollment customer API using a service account in about 10 minutes.

  • You will need a service account linked to your zero-touch enrollment customer account, Visual Studio 2013 or later, and internet access to complete this process.

  • The process involves creating or selecting a project in the Google Developers Console to enable the zero-touch enrollment API and creating a JSON service account key.

  • The project setup requires creating a .NET Core C# Console Application in Visual Studio and adding the Google.Apis.AndroidProvisioningPartner.v1 and Google.Apis.Auth NuGet packages.

  • The sample code provided in this guide demonstrates how to use the service account key to authenticate, access the customer's account, and list the available DPCs (Device Policy Controllers) through the zero-touch enrollment API.

Follow the steps in this quickstart guide, and in about 10 minutes you have a simple .NET C# console app that makes requests to the zero-touch enrollment customer API using a service account.

Prerequisites

To run this quickstart, you need:

  • A service account, that's linked to you zero-touch enrollment customer account. See Get started.
  • Visual Studio 2013 or later.
  • Access to the internet and a web browser.

Step 1: Turn on the zero-touch enrollment API

  1. Use this wizard to create or select a project in the Google Developers Console and automatically turn on the API. Click Continue, then Go to credentials .
  2. Set What data will you be accessing? to Application data.
  3. Click Next. You should be prompted to create a service account.
  4. Give a descriptive name for Service account name.
  5. Note the Service account ID (it looks like an email address) because you'll use it later.
  6. Set Role to Service Accounts > Service Account User.
  7. Click Done to finish creating the service account.
  8. Click the email address for the service account that you created.
  9. Click **Keys**.
  10. Click **Add key**, then click **Create new key**.
  11. For **Key type**, select **JSON**.
  12. Click Create and the private key downloads to your computer.
  13. Click **Close**.
  14. Move the file to your working directory and rename it service_account_key.json.

Step 2: Prepare the project

  1. Create a new .NET Core C# Console Application project in Visual Studio.
  2. Open the Package Manager, select the package source nuget.org, and add the following packages:
    • Google.Apis.AndroidProvisioningPartner.v1
    • Google.Apis.Auth

To learn more, read the Microsoft document Install and use a package.

Step 3: Set up the sample

  1. Drag the service_account_key.json you downloaded when you created your service account into your Visual Studio Solution Explorer.
  2. Select service_account_key.json, and then go to the Properties window and set Copy to output directory field to Always copy.
  3. Replace the contents of Program.cs with the following code:
using Google.Apis.AndroidProvisioningPartner.v1;
using Google.Apis.AndroidProvisioningPartner.v1.Data;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Services;
using System;
using System.Collections.Generic;
using System.IO;
using System.Threading;

namespace ZeroTouchCustomerQuickstart
{
    class Program
    {
        // A single scope is used for the zero-touch enrollment customer API.
        static readonly string[] Scopes =
            { "https://www.googleapis.com/auth/androidworkzerotouchemm" };
        static string ApplicationName = "Zero-touch Enrollment .NET Quickstart";

        static void Main(string[] args)
        {
            GoogleCredential credential;

            // Authenticate using the service account key
            credential = GoogleCredential.FromFile("service_account_key.json")
                .CreateScoped(Scopes);

            // Create a zero-touch enrollment API service endpoint.
            var service = new AndroidProvisioningPartnerService(new BaseClientService.Initializer
            {
                HttpClientInitializer = credential,
                ApplicationName = ApplicationName
            });

            // Get the customer's account. Because a customer might have more
            // than one, limit the results to the first account found.
            CustomersResource.ListRequest accountRequest = service.Customers.List();
            accountRequest.PageSize = 1;
            CustomerListCustomersResponse accountResponse = accountRequest.Execute();
            if (accountResponse.Customers.Count == 0)
            {
                // No accounts found for the user. Confirm the Google Account
                // that authorizes the request can access the zero-touch portal.
                Console.WriteLine("No zero-touch enrollment account found.");
                Environment.Exit(-1);
            }
            Company customer = accountResponse.Customers[0];
            var customerAccount = String.Format("customers/{0}", customer.CompanyId);


            // Send an API request to list all the DPCs available.
            CustomersResource.DpcsResource.ListRequest request = service.Customers.Dpcs.
                List(customerAccount);
            CustomerListDpcsResponse response = request.Execute();

            // Print out the details of each DPC.
            IList<Dpc> dpcs = response.Dpcs;
            foreach (Dpc dpcApp in dpcs)
            {
                Console.WriteLine("Name:{0}  APK:{1}",
                                  dpcApp.DpcName,
                                  dpcApp.PackageName);
            }

        }
    }
}

Step 4: Run the sample

To build and run the sample, click Start in the Visual Studio toolbar.

Notes

  • Avoid sharing your service_account_key.json file with anyone. Be careful not to include it in source code repositories. You can read more advice on handling service account secrets.

Learn more