ExportService.php
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<?php namespace BookStack\Services;
use BookStack\Page;
class ExportService
{
/**
* Convert a page to a self-contained HTML file.
* Includes required CSS & image content. Images are base64 encoded into the HTML.
* @param Page $page
* @return mixed|string
*/
public function pageToContainedHtml(Page $page)
{
$cssContent = file_get_contents(public_path('/css/export-styles.css'));
$pageHtml = view('pages/pdf', ['page' => $page, 'css' => $cssContent])->render();
$imageTagsOutput = [];
preg_match_all("/\<img.*src\=(\'|\")(.*?)(\'|\").*?\>/i", $pageHtml, $imageTagsOutput);
// Replace image src with base64 encoded image strings
if (isset($imageTagsOutput[0]) && count($imageTagsOutput[0]) > 0) {
foreach ($imageTagsOutput[0] as $index => $imgMatch) {
$oldImgString = $imgMatch;
$srcString = $imageTagsOutput[2][$index];
if (strpos(trim($srcString), 'http') !== 0) {
$pathString = public_path($srcString);
} else {
$pathString = $srcString;
}
$imageContent = file_get_contents($pathString);
$imageEncoded = 'data:image/' . pathinfo($pathString, PATHINFO_EXTENSION) . ';base64,' . base64_encode($imageContent);
$newImageString = str_replace($srcString, $imageEncoded, $oldImgString);
$pageHtml = str_replace($oldImgString, $newImageString, $pageHtml);
}
}
$linksOutput = [];
preg_match_all("/\<a.*href\=(\'|\")(.*?)(\'|\").*?\>/i", $pageHtml, $linksOutput);
// Replace image src with base64 encoded image strings
if (isset($linksOutput[0]) && count($linksOutput[0]) > 0) {
foreach ($linksOutput[0] as $index => $linkMatch) {
$oldLinkString = $linkMatch;
$srcString = $linksOutput[2][$index];
if (strpos(trim($srcString), 'http') !== 0) {
$newSrcString = url($srcString);
$newLinkString = str_replace($srcString, $newSrcString, $oldLinkString);
$pageHtml = str_replace($oldLinkString, $newLinkString, $pageHtml);
}
}
}
// Replace any relative links with system domain
return $pageHtml;
}
}