BookStack Code Mirror - bookstack/blob - app/Services/ExportService.php

   1 <?php namespace BookStack\Services;
   2
   3
   4 use BookStack\Page;
   5
   6 class ExportService
   7 {
   8
   9
  10     /**
  11      * Convert a page to a self-contained HTML file.
  12      * Includes required CSS & image content. Images are base64 encoded into the HTML.
  13      * @param Page $page
  14      * @return mixed|string
  15      */
  16     public function pageToContainedHtml(Page $page)
  17     {
  18         $cssContent = file_get_contents(public_path('/css/export-styles.css'));
  19         $pageHtml = view('pages/pdf', ['page' => $page, 'css' => $cssContent])->render();
  20
  21         $imageTagsOutput = [];
  22         preg_match_all("/\<img.*src\=(\'|\")(.*?)(\'|\").*?\>/i", $pageHtml, $imageTagsOutput);
  23
  24         // Replace image src with base64 encoded image strings
  25         if (isset($imageTagsOutput[0]) && count($imageTagsOutput[0]) > 0) {
  26             foreach ($imageTagsOutput[0] as $index => $imgMatch) {
  27                 $oldImgString = $imgMatch;
  28                 $srcString = $imageTagsOutput[2][$index];
  29                 if (strpos(trim($srcString), 'http') !== 0) {
  30                     $pathString = public_path($srcString);
  31                 } else {
  32                     $pathString = $srcString;
  33                 }
  34                 $imageContent = file_get_contents($pathString);
  35                 $imageEncoded = 'data:image/' . pathinfo($pathString, PATHINFO_EXTENSION) . ';base64,' . base64_encode($imageContent);
  36                 $newImageString = str_replace($srcString, $imageEncoded, $oldImgString);
  37                 $pageHtml = str_replace($oldImgString, $newImageString, $pageHtml);
  38             }
  39         }
  40
  41         $linksOutput = [];
  42         preg_match_all("/\<a.*href\=(\'|\")(.*?)(\'|\").*?\>/i", $pageHtml, $linksOutput);
  43
  44         // Replace image src with base64 encoded image strings
  45         if (isset($linksOutput[0]) && count($linksOutput[0]) > 0) {
  46             foreach ($linksOutput[0] as $index => $linkMatch) {
  47                 $oldLinkString = $linkMatch;
  48                 $srcString = $linksOutput[2][$index];
  49                 if (strpos(trim($srcString), 'http') !== 0) {
  50                     $newSrcString = url($srcString);
  51                     $newLinkString = str_replace($srcString, $newSrcString, $oldLinkString);
  52                     $pageHtml = str_replace($oldLinkString, $newLinkString, $pageHtml);
  53                 }
  54             }
  55         }
  56
  57         // Replace any relative links with system domain
  58         return $pageHtml;
  59     }
  60
  61 }