138 lines
4.6 KiB
PHP
138 lines
4.6 KiB
PHP
<?php namespace BookStack\Services;
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use BookStack\Page;
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use BookStack\Repos\EntityRepo;
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class ExportService
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{
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protected $entityRepo;
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/**
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* ExportService constructor.
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* @param $entityRepo
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*/
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public function __construct(EntityRepo $entityRepo)
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{
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$this->entityRepo = $entityRepo;
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}
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/**
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* Convert a page to a self-contained HTML file.
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* Includes required CSS & image content. Images are base64 encoded into the HTML.
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* @param Page $page
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* @return mixed|string
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*/
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public function pageToContainedHtml(Page $page)
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{
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$cssContent = file_get_contents(public_path('/css/export-styles.css'));
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$pageHtml = view('pages/export', ['page' => $page, 'pageContent' => $this->entityRepo->renderPage($page), 'css' => $cssContent])->render();
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return $this->containHtml($pageHtml);
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}
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/**
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* Convert a page to a pdf file.
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* @param Page $page
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* @return mixed|string
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*/
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public function pageToPdf(Page $page)
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{
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$cssContent = file_get_contents(public_path('/css/export-styles.css'));
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$pageHtml = view('pages/pdf', ['page' => $page, 'pageContent' => $this->entityRepo->renderPage($page), 'css' => $cssContent])->render();
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// return $pageHtml;
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$useWKHTML = config('snappy.pdf.binary') !== false;
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$containedHtml = $this->containHtml($pageHtml);
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if ($useWKHTML) {
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$pdf = \SnappyPDF::loadHTML($containedHtml);
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} else {
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$pdf = \PDF::loadHTML($containedHtml);
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}
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return $pdf->output();
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}
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/**
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* Bundle of the contents of a html file to be self-contained.
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* @param $htmlContent
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* @return mixed|string
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*/
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protected function containHtml($htmlContent)
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{
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$imageTagsOutput = [];
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preg_match_all("/\<img.*src\=(\'|\")(.*?)(\'|\").*?\>/i", $htmlContent, $imageTagsOutput);
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// Replace image src with base64 encoded image strings
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if (isset($imageTagsOutput[0]) && count($imageTagsOutput[0]) > 0) {
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foreach ($imageTagsOutput[0] as $index => $imgMatch) {
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$oldImgString = $imgMatch;
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$srcString = $imageTagsOutput[2][$index];
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$isLocal = strpos(trim($srcString), 'http') !== 0;
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if ($isLocal) {
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$pathString = public_path(trim($srcString, '/'));
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} else {
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$pathString = $srcString;
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}
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if ($isLocal && !file_exists($pathString)) continue;
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try {
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$imageContent = file_get_contents($pathString);
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$imageEncoded = 'data:image/' . pathinfo($pathString, PATHINFO_EXTENSION) . ';base64,' . base64_encode($imageContent);
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$newImageString = str_replace($srcString, $imageEncoded, $oldImgString);
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} catch (\ErrorException $e) {
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$newImageString = '';
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}
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$htmlContent = str_replace($oldImgString, $newImageString, $htmlContent);
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}
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}
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$linksOutput = [];
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preg_match_all("/\<a.*href\=(\'|\")(.*?)(\'|\").*?\>/i", $htmlContent, $linksOutput);
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// Replace image src with base64 encoded image strings
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if (isset($linksOutput[0]) && count($linksOutput[0]) > 0) {
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foreach ($linksOutput[0] as $index => $linkMatch) {
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$oldLinkString = $linkMatch;
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$srcString = $linksOutput[2][$index];
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if (strpos(trim($srcString), 'http') !== 0) {
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$newSrcString = url($srcString);
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$newLinkString = str_replace($srcString, $newSrcString, $oldLinkString);
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$htmlContent = str_replace($oldLinkString, $newLinkString, $htmlContent);
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}
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}
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}
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// Replace any relative links with system domain
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return $htmlContent;
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}
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/**
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* Converts the page contents into simple plain text.
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* This method filters any bad looking content to provide a nice final output.
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* @param Page $page
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* @return mixed
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*/
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public function pageToPlainText(Page $page)
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{
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$html = $this->entityRepo->renderPage($page);
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$text = strip_tags($html);
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// Replace multiple spaces with single spaces
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$text = preg_replace('/\ {2,}/', ' ', $text);
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// Reduce multiple horrid whitespace characters.
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$text = preg_replace('/(\x0A|\xA0|\x0A|\r|\n){2,}/su', "\n\n", $text);
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$text = html_entity_decode($text);
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// Add title
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$text = $page->name . "\n\n" . $text;
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return $text;
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}
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}
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