web.php

<?php

/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/

Route::get('/', function () {
    return view('welcome');
});

Route::get('put', function() {
    Storage::cloud()->put('test.txt', 'Hello World');
    return 'File was saved to Google Drive';
});

Route::get('list', function() {
    $dir = '/';
    $recursive = false; // Get subdirectories also?
    $contents = collect(Storage::cloud()->listContents($dir, $recursive));

    //return $contents->where('type', '=', 'dir'); // directories
    return $contents->where('type', '=', 'file'); // files
});

Route::get('get', function() {
    $filename = 'test.txt';

    $dir = '/';
    $recursive = false; // Get subdirectories also?
    $contents = collect(Storage::cloud()->listContents($dir, $recursive));

    $file = $contents
        ->where('type', '=', 'file')
        ->where('filename', '=', pathinfo($filename, PATHINFO_FILENAME))
        ->where('extension', '=', pathinfo($filename, PATHINFO_EXTENSION))
        ->first(); // there can be duplicate file names!

    //return $file; // array with file info

    $rawData = Storage::cloud()->get($file['path']);

    return response($rawData, 200)
        ->header('ContentType', $file['mimetype'])
        ->header('Content-Disposition', "attachment; filename='$filename'");
});

Route::get('create-dir', function() {
    Storage::cloud()->makeDirectory('Test Dir');
    return 'Directory was created in Google Drive';
});

Route::get('put-in-dir', function() {
    $dir = '/';
    $recursive = false; // Get subdirectories also?
    $contents = collect(Storage::cloud()->listContents($dir, $recursive));

    $dir = $contents->where('type', '=', 'dir')
        ->where('filename', '=', 'Test Dir')
        ->first(); // There could be duplicate directory names!

    if ( ! $dir) {
        return 'Directory does not exist!';
    }

    Storage::cloud()->put($dir['path'].'/test.txt', 'Hello World');

    return 'File was created in the sub directory in Google Drive';
});