SchemaRetriever.php

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<?php
 
namespace Drupal\dkan_schema;
 
use Contracts\RetrieverInterface;
use Drupal\Core\Extension\ExtensionList;
 
class SchemaRetriever implements RetrieverInterface {
 
  protected $directory;
 
  public function __construct($appRoot, ExtensionList $extensionList) {
    $this->findSchemaDirectory($appRoot, $extensionList);
  }
 
  public function getAllIds() {
    return [
      'catalog',
      'dataset',
      'dataset.ui',
    ];
  }
 
  public function getSchemaDirectory() {
    return $this->directory;
  }
 
  public function retrieve(string $id): ?string {
 
    $filename = $this->getSchemaDirectory() . "/collections/{$id}.json";
 
    if (in_array($id, $this->getAllIds())
          && is_readable($filename)
      ) {
      return file_get_contents($filename);
    }
    throw new \Exception("Schema {$id} not found.");
  }
 
  protected function findSchemaDirectory($appRoot, $extensionList) {
 
    $drupalRoot = $appRoot;
 
    if (is_dir($drupalRoot . "/schema")) {
      $this->directory = $drupalRoot . "/schema";
    }
    elseif (($directory = $this->getDefaultSchemaDirectory($extensionList))
          && is_dir($directory)
      ) {
      $this->directory = $directory;
    }
    else {
      throw new \Exception("No schema directory found.");
    }
  }
 
  protected function getDefaultSchemaDirectory($extensionList) {
    $extensionList = $extensionList;
    $infoFile = $extensionList->getPathname('dkan2');
 
    return dirname($infoFile) . '/schema';
  }
 
}