Google Drive SDK creates file for user

I'll go with Marcel Balck.

This way we'll use impersonation!

we can use a service account to authenticate, then use any email account in our domain and upload files. The downloaded files will show up in the Drives section under My Files (not with me)! The files also belong to an impersonated account. Tested in a small console app:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Drive.v2;
using Google.Apis.Drive.v2.Data;
using Google.Apis.Services;

namespace UseWebServiceMethod
{
    class Program
    {
        // Goto https://admin.google.com/AdminHome?chromeless=1#OGX:ManageOauthClients
        // Login met admin account => ****@***.***
        // Add/edit Client Name (Use Client ID of service account here) => 2***8.apps.googleusercontent.com
        // One or More API Scopes => https://www.googleapis.com/auth/drive 

        public const string ImpersonatedAccountEmail = "****@***.***";
        public const string ServiceAccountEmail      = "2******8@developer.gserviceaccount.com";
        public const string Key                      = @"C:\Users\Wouter\Desktop\GoogleTester\GoogleTester\A****c.p12";
        public const string FileToUpload             = @"C:\Users\Wouter\Desktop\GoogleTester\GoogleTester\whakingly.txt";
        public const string ApplicationName          = "A***l";

        static void Main()
        {
            var certificate = new X509Certificate2(Key, "notasecret", X509KeyStorageFlags.Exportable);
            var initializer = new ServiceAccountCredential.Initializer(ServiceAccountEmail)
            {
                Scopes = new[] { DriveService.Scope.Drive },
                User = ImpersonatedAccountEmail
            };

            var credential = new ServiceAccountCredential(initializer.FromCertificate(certificate));
            var driveService = new DriveService(new BaseClientService.Initializer()
            {
                HttpClientInitializer = credential,
                ApplicationName = ApplicationName
            });

            // Show all files
            var list = driveService.Files.List().Execute();
            if (list.Items != null)
                foreach (var fileItem in list.Items)
                {
                    Console.WriteLine(fileItem.Title + " - " + fileItem.Description);
                }
            Console.WriteLine("Press Enter to continue.");
            Console.ReadLine();

            // Upload a new file
            File body = new File();
            body.Title = "whakingly.txt";
            body.Description = "A whakingly (that a new word I created just there) file thats uploaded with impersonation";
            body.MimeType = "text/plain";
            byte[] byteArray = System.IO.File.ReadAllBytes(FileToUpload);
            var stream = new System.IO.MemoryStream(byteArray);
            FilesResource.InsertMediaUpload request = driveService.Files.Insert(body, stream, "text/plain");
            request.Upload();
            File file = request.ResponseBody;
            Console.WriteLine("Press Enter to continue.");
            Console.ReadLine();

            // Show all files
            var list2 = driveService.Files.List().Execute();
            if (list2.Items != null)
                foreach (var fileItem in list2.Items)
                {
                    Console.WriteLine(fileItem.Title + " - " + fileItem.Description);
                }
            Console.WriteLine("Press Enter to continue.");
            Console.ReadLine();

        }
    }
}