BookStack Code Mirror - bookstack/blob - app/Entities/Tools/PdfGenerator.php

   1 <?php
   2
   3 namespace BookStack\Entities\Tools;
   4
   5 use Barryvdh\Snappy\Facades\SnappyPdf;
   6 use Dompdf\Dompdf;
   7
   8 class PdfGenerator
   9 {
  10     const ENGINE_DOMPDF = 'dompdf';
  11     const ENGINE_WKHTML = 'wkhtml';
  12     const ENGINE_COMMAND = 'command';
  13
  14     /**
  15      * Generate PDF content from the given HTML content.
  16      */
  17     public function fromHtml(string $html): string
  18     {
  19         $engine = $this->getActiveEngine();
  20
  21         if ($engine === self::ENGINE_WKHTML) {
  22             $pdf = SnappyPDF::loadHTML($html);
  23             $pdf->setOption('print-media-type', true);
  24             return $pdf->output();
  25         } else if ($engine === self::ENGINE_COMMAND) {
  26             // TODO - Support PDF command
  27             return '';
  28         }
  29
  30         return $this->renderUsingDomPdf($html);
  31     }
  32
  33     /**
  34      * Get the currently active PDF engine.
  35      * Returns the value of an `ENGINE_` const on this class.
  36      */
  37     public function getActiveEngine(): string
  38     {
  39         $wkhtmlBinaryPath = config('snappy.pdf.binary');
  40         if (file_exists(base_path('wkhtmltopdf'))) {
  41             $wkhtmlBinaryPath = base_path('wkhtmltopdf');
  42         }
  43
  44         if (is_string($wkhtmlBinaryPath) && config('app.allow_untrusted_server_fetching') === true) {
  45             return self::ENGINE_WKHTML;
  46         }
  47
  48         return self::ENGINE_DOMPDF;
  49     }
  50
  51     protected function renderUsingDomPdf(string $html): string
  52     {
  53         $options = config('exports.dompdf');
  54         $domPdf = new Dompdf($options);
  55         $domPdf->setBasePath(base_path('public'));
  56
  57         $domPdf->loadHTML($this->convertEntities($html));
  58         $domPdf->render();
  59
  60         return (string) $domPdf->output();
  61     }
  62
  63     /**
  64      * Taken from https://github.com/barryvdh/laravel-dompdf/blob/v2.1.1/src/PDF.php
  65      * Copyright (c) 2021 barryvdh, MIT License
  66      * https://github.com/barryvdh/laravel-dompdf/blob/v2.1.1/LICENSE
  67      */
  68     protected function convertEntities(string $subject): string
  69     {
  70         $entities = [
  71             '€' => '&euro;',
  72             '£' => '&pound;',
  73         ];
  74
  75         foreach ($entities as $search => $replace) {
  76             $subject = str_replace($search, $replace, $subject);
  77         }
  78         return $subject;
  79     }
  80 }