CSV response for Nette Application

CsvResponse.php

<?php

declare(strict_types=1);

namespace App\Responses;

use Nette\Application;
use Nette\Http;


class CsvResponse implements Application\IResponse
{
	/** @var string */
	private $fileName;

	/** @var string */
	private $delimiter;

	/** @var iterable */
	private $rows;

	/** @var array */
	private $columnTitles;


	/**
	 * @param  string $fileName  file name displayed by browser, extension should be .csv
	 * @param  string $delimiter  columns delimiter (comma, semicolon...)
	 * @param  iterable $rows
	 * @param  array $columnTitles  first line values
	 */
	public function __construct(string $fileName, string $delimiter, iterable $rows, array $columnTitles = [])
	{
		$this->fileName = $fileName;
		$this->delimiter = $delimiter;
		$this->rows = $rows;
		$this->columnTitles = $columnTitles;
	}


	public function send(Http\IRequest $httpRequest, Http\IResponse $httpResponse)
	{
		$httpResponse->setContentType('text/csv', 'utf-8');
		$httpResponse->setHeader('Content-Description', 'File Transfer');
		$httpResponse->setHeader(
			'Content-Disposition',
			'attachment; filename="' . str_replace('"', "'", $this->fileName) . '"; filename*=utf-8\'\'' . rawurlencode($this->fileName)
		);

		$fd = fopen('php://output', 'wb');
		if (count($this->columnTitles) || count($this->rows)) {  # With no rows, MS Excel shows BOM in A1 cell.
			# Send BOM, otherwise MS Excel expects data in local OS encoding (e.g. Windows-1250)
			fputs($fd, "\xEF\xBB\xBF");
		}

		if (count($this->columnTitles)) {
			fputcsv($fd, $this->columnTitles, $this->delimiter);
		}

		foreach ($this->rows as $row) {
			fputcsv($fd, $row instanceof \Traversable ? iterator_to_array($row) : (array) $row, $this->delimiter);
		}

		fclose($fd);
		die();
	}
}