gcs-8.x-1.0-alpha3/gcs.module

<?php

use Drupal\Core\Block\BlockPluginInterface;
/**
 * @file
 */

use Google\Cloud\Storage\StorageClient;

/**
 * Implements hook_block_view_alter().
 *
 * Ideally, all items on the front-end in public:// will be called from a
 * block, one way or another. This little alter will ensure that all content
 * within a block is filtered for this site's file directory and rewritten to
 * pull the images from Google Images.
 */
function gcs_block_view_alter(array &$build, BlockPluginInterface $block) {
  $build['#pre_render'][] = 'gcs_block_prerender';
}

/**
 * Callback for the function above.
 */
function gcs_block_prerender(array $build) {
  if(isset($build['content']['#markup']) && $build['content']['#markup']) {
    $config = \Drupal::config('gcs.settings');
    $bucket_name = 'https://storage.googleapis.com/' . $config->get('gcs.bucket_name') . '/';

    // Look for anything that looks like a local path to our files directory.
    $base_file_path = addcslashes(parse_url(file_create_url('public://'))['path'], '/');
       
    $host = \Drupal::request()->getHost();
    
    // Kill anything local.
    $pattern = [
      '/("|\'|\()' . $base_file_path . '/im',
      '/("|\'|\()http:\/\/' . $host . $base_file_path . '/im',
      '/("|\'|\()https:\/\/' . $host . $base_file_path . '/im',
    ];

    if(is_string($build['content']['#markup']))
      $build['content']['#markup'] = preg_replace($pattern, '\1' . $bucket_name, $build['content']['#markup']);
    else {
      $content = preg_replace($pattern, '\1' . $bucket_name, $build['content']['#markup']->__toString());
      $build['content']['#markup'] = $build['content']['#markup']->create($content);
    }
  }

  return $build;
}

/**
 * This is a placeholder for now.
 */
function gcs_sample() {
  $config = \Drupal::config('gcs.settings');
  
  require 'vendor/autoload.php';

  $storage = new StorageClient([
    'projectId' => $config->get('gcs.project_id'),
  ]);

  $bucket = $storage->bucket($config->get('gcs.bucket_name'));

  // Upload a file to the bucket.
  $bucket->upload(
      fopen('/data/file.txt', 'r')
  );

  // Using Predefined ACLs to manage object permissions, you may
  // upload a file and give read access to anyone with the URL.
  $bucket->upload(
      fopen('/data/file.txt', 'r'),
      [
          'predefinedAcl' => 'publicRead'
      ]
  );

  // Download and store an object from the bucket locally.
  $object = $bucket->object('file_backup.txt');
  $object->downloadToFile('/data/file_backup.txt');



  $storage->registerStreamWrapper();
  $contents = file_get_contents('gs://' . $config->get('gcs.bucket_name') . '/file_backup.txt');
}