class TokenHooks

class TokenHooks {
    public function __construct(Token $token, LanguageManagerInterface $languageManager, DateFormatterInterface $dateFormatter, EntityTypeManagerInterface $entityTypeManager) {
    }
    
    /**
     * Implements hook_tokens().
     */
    public function tokens($type, $tokens, array $data, array $options, BubbleableMetadata $bubbleable_metadata) : array {
        $url_options = [
            'absolute' => TRUE,
        ];
        if (isset($options['langcode'])) {
            $url_options['language'] = $this->languageManager
                ->getLanguage($options['langcode']);
            $langcode = $options['langcode'];
        }
        else {
            $langcode = NULL;
        }
        $replacements = [];
        if ($type == 'file' && !empty($data['file'])) {
            $dateFormatStorage = $this->entityTypeManager
                ->getStorage('date_format');
            
            /** @var \Drupal\file\FileInterface $file */
            $file = $data['file'];
            foreach ($tokens as $name => $original) {
                switch ($name) {
                    // Basic keys and values.
                    case 'fid':
                        $replacements[$original] = $file->id();
                        break;
                    case 'uuid':
                        $replacements[$original] = $file->uuid();
                        break;
                    // Essential file data
                    case 'name':
                        $replacements[$original] = $file->getFilename();
                        break;
                    case 'path':
                        $replacements[$original] = $file->getFileUri();
                        break;
                    case 'mime':
                        $replacements[$original] = $file->getMimeType();
                        break;
                    case 'size':
                        $replacements[$original] = ByteSizeMarkup::create($file->getSize());
                        break;
                    case 'url':
                        // Ideally, this would use return a relative URL, but because tokens
                        // are also often used in emails, it's better to keep absolute file
                        // URLs. The 'url.site' cache context is associated to ensure the
                        // correct absolute URL is used in case of a multisite setup.
                        $replacements[$original] = $file->createFileUrl(FALSE);
                        $bubbleable_metadata->addCacheContexts([
                            'url.site',
                        ]);
                        break;
                    // These tokens are default variations on the chained tokens handled below.
                    case 'created':
                        $date_format = $dateFormatStorage->load('medium');
                        $bubbleable_metadata->addCacheableDependency($date_format);
                        $replacements[$original] = $this->dateFormatter
                            ->format($file->getCreatedTime(), 'medium', '', NULL, $langcode);
                        break;
                    case 'changed':
                        $date_format = $dateFormatStorage->load('medium');
                        $bubbleable_metadata = $bubbleable_metadata->addCacheableDependency($date_format);
                        $replacements[$original] = $this->dateFormatter
                            ->format($file->getChangedTime(), 'medium', '', NULL, $langcode);
                        break;
                    case 'owner':
                        $owner = $file->getOwner();
                        $bubbleable_metadata->addCacheableDependency($owner);
                        $name = $owner->label();
                        $replacements[$original] = $name;
                        break;
                }
            }
            if ($date_tokens = $this->token
                ->findWithPrefix($tokens, 'created')) {
                $replacements += $this->token
                    ->generate('date', $date_tokens, [
                    'date' => $file->getCreatedTime(),
                ], $options, $bubbleable_metadata);
            }
            if ($date_tokens = $this->token
                ->findWithPrefix($tokens, 'changed')) {
                $replacements += $this->token
                    ->generate('date', $date_tokens, [
                    'date' => $file->getChangedTime(),
                ], $options, $bubbleable_metadata);
            }
            if (($owner_tokens = $this->token
                ->findWithPrefix($tokens, 'owner')) && $file->getOwner()) {
                $replacements += $this->token
                    ->generate('user', $owner_tokens, [
                    'user' => $file->getOwner(),
                ], $options, $bubbleable_metadata);
            }
        }
        return $replacements;
    }
    
    /**
     * Implements hook_token_info().
     */
    public function tokenInfo() : array {
        $types['file'] = [
            'name' => t("Files"),
            'description' => t("Tokens related to uploaded files."),
            'needs-data' => 'file',
        ];
        // File related tokens.
        $file['fid'] = [
            'name' => t("File ID"),
            'description' => t("The unique ID of the uploaded file."),
        ];
        $file['uuid'] = [
            'name' => t('UUID'),
            'description' => t('The UUID of the uploaded file.'),
        ];
        $file['name'] = [
            'name' => t("File name"),
            'description' => t("The name of the file on disk."),
        ];
        $file['path'] = [
            'name' => t("Path"),
            'description' => t("The location of the file relative to Drupal root."),
        ];
        $file['mime'] = [
            'name' => t("MIME type"),
            'description' => t("The MIME type of the file."),
        ];
        $file['size'] = [
            'name' => t("File size"),
            'description' => t("The size of the file."),
        ];
        $file['url'] = [
            'name' => t("URL"),
            'description' => t("The web-accessible URL for the file."),
        ];
        $file['created'] = [
            'name' => t("Created"),
            'description' => t("The date the file created."),
            'type' => 'date',
        ];
        $file['changed'] = [
            'name' => t("Changed"),
            'description' => t("The date the file was most recently changed."),
            'type' => 'date',
        ];
        $file['owner'] = [
            'name' => t("Owner"),
            'description' => t("The user who originally uploaded the file."),
            'type' => 'user',
        ];
        return [
            'types' => $types,
            'tokens' => [
                'file' => $file,
            ],
        ];
    }

}