[Summary view]

   1  <?php
   2  
   3  namespace PhpOffice\PhpSpreadsheet\Helper;
   4  
   5  use PhpOffice\PhpSpreadsheet\Exception;
   6  
   7  class Downloader
   8  {
   9      protected string $filepath;
  10  
  11      protected string $filename;
  12  
  13      protected string $filetype;
  14  
  15      protected const CONTENT_TYPES = [
  16          'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
  17          'xls' => 'application/vnd.ms-excel',
  18          'ods' => 'application/vnd.oasis.opendocument.spreadsheet',
  19          'csv' => 'text/csv',
  20          'html' => 'text/html',
  21          'pdf' => 'application/pdf',
  22      ];
  23  
  24      public function __construct(string $folder, string $filename, ?string $filetype = null)
  25      {
  26          if ((is_dir($folder) === false) || (is_readable($folder) === false)) {
  27              throw new Exception("Folder {$folder} is not accessable");
  28          }
  29          $filepath = "{$folder}/{$filename}";
  30          $this->filepath = (string) realpath($filepath);
  31          $this->filename = basename($filepath);
  32          if ((file_exists($this->filepath) === false) || (is_readable($this->filepath) === false)) {
  33              throw new Exception("{$this->filename} not found, or cannot be read");
  34          }
  35  
  36          $filetype ??= pathinfo($filename, PATHINFO_EXTENSION);
  37          if (array_key_exists(strtolower($filetype), self::CONTENT_TYPES) === false) {
  38              throw new Exception("Invalid filetype: {$filetype} cannot be downloaded");
  39          }
  40          $this->filetype = strtolower($filetype);
  41      }
  42  
  43      public function download(): void
  44      {
  45          $this->headers();
  46  
  47          readfile($this->filepath);
  48      }
  49  
  50      public function headers(): void
  51      {
  52          ob_clean();
  53  
  54          $this->contentType();
  55          $this->contentDisposition();
  56          $this->cacheHeaders();
  57          $this->fileSize();
  58  
  59          flush();
  60      }
  61  
  62      protected function contentType(): void
  63      {
  64          header('Content-Type: ' . self::CONTENT_TYPES[$this->filetype]);
  65      }
  66  
  67      protected function contentDisposition(): void
  68      {
  69          header('Content-Disposition: attachment;filename="' . $this->filename . '"');
  70      }
  71  
  72      protected function cacheHeaders(): void
  73      {
  74          header('Cache-Control: max-age=0');
  75          // If you're serving to IE 9, then the following may be needed
  76          header('Cache-Control: max-age=1');
  77  
  78          // If you're serving to IE over SSL, then the following may be needed
  79          header('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); // Date in the past
  80          header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT'); // always modified
  81          header('Cache-Control: cache, must-revalidate'); // HTTP/1.1
  82          header('Pragma: public'); // HTTP/1.0
  83      }
  84  
  85      protected function fileSize(): void
  86      {
  87          header('Content-Length: ' . filesize($this->filepath));
  88      }
  89  }