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<?php
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namespace PhpOffice\PhpSpreadsheet\Helper;
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use PhpOffice\PhpSpreadsheet\Exception;
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/**
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* Assist downloading files when samples are run in browser.
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* Never run as part of unit tests, which are command line.
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*
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* @codeCoverageIgnore
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*/
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class Downloader
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{
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protected string $filepath;
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protected string $filename;
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protected string $filetype;
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protected const CONTENT_TYPES = [
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'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
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'xls' => 'application/vnd.ms-excel',
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'ods' => 'application/vnd.oasis.opendocument.spreadsheet',
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'csv' => 'text/csv',
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'html' => 'text/html',
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'pdf' => 'application/pdf',
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];
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public function __construct(string $folder, string $filename, ?string $filetype = null)
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{
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if ((is_dir($folder) === false) || (is_readable($folder) === false)) {
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throw new Exception('Folder is not accessible');
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}
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$filepath = "{$folder}/{$filename}";
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$this->filepath = (string) realpath($filepath);
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$this->filename = basename($filepath);
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if ((file_exists($this->filepath) === false) || (is_readable($this->filepath) === false)) {
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throw new Exception('File not found, or cannot be read');
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}
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$filetype ??= pathinfo($filename, PATHINFO_EXTENSION);
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if (array_key_exists(strtolower($filetype), self::CONTENT_TYPES) === false) {
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throw new Exception('Invalid filetype: file cannot be downloaded');
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}
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$this->filetype = strtolower($filetype);
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}
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public function download(): void
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{
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$this->headers();
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readfile($this->filepath);
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}
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public function headers(): void
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{
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// I cannot tell what this ob_clean is paired with.
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// I have never seen a problem with it, but someone has - issue 3739.
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// Perhaps it should be removed altogether,
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// but making it conditional seems harmless, and safer.
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if ((int) ob_get_length() > 0) {
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ob_clean();
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}
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$this->contentType();
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$this->contentDisposition();
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$this->cacheHeaders();
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$this->fileSize();
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flush();
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}
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protected function contentType(): void
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{
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header('Content-Type: ' . self::CONTENT_TYPES[$this->filetype]);
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}
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protected function contentDisposition(): void
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{
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header('Content-Disposition: attachment;filename="' . $this->filename . '"');
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}
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protected function cacheHeaders(): void
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{
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header('Cache-Control: max-age=0');
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// If you're serving to IE 9, then the following may be needed
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header('Cache-Control: max-age=1');
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// If you're serving to IE over SSL, then the following may be needed
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header('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); // Date in the past
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header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT'); // always modified
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header('Cache-Control: cache, must-revalidate'); // HTTP/1.1
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header('Pragma: public'); // HTTP/1.0
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}
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protected function fileSize(): void
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{
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header('Content-Length: ' . filesize($this->filepath));
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}
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}
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