html = (new PageContent($page))->render(); $pageHtml = view('exports.page', [ 'page' => $page, 'format' => 'html', 'cspContent' => $this->cspService->getCspMetaTagValue(), 'locale' => user()->getLocale(), ])->render(); return $this->containHtml($pageHtml); } /** * Convert a chapter to a self-contained HTML file. * * @throws Throwable */ public function chapterToContainedHtml(Chapter $chapter): string { $pages = $chapter->getVisiblePages(); $pages->each(function ($page) { $page->html = (new PageContent($page))->render(); }); $html = view('exports.chapter', [ 'chapter' => $chapter, 'pages' => $pages, 'format' => 'html', 'cspContent' => $this->cspService->getCspMetaTagValue(), 'locale' => user()->getLocale(), ])->render(); return $this->containHtml($html); } /** * Convert a book to a self-contained HTML file. * * @throws Throwable */ public function bookToContainedHtml(Book $book): string { $bookTree = (new BookContents($book))->getTree(false, true); $html = view('exports.book', [ 'book' => $book, 'bookChildren' => $bookTree, 'format' => 'html', 'cspContent' => $this->cspService->getCspMetaTagValue(), 'locale' => user()->getLocale(), ])->render(); return $this->containHtml($html); } /** * Convert a page to a PDF file. * * @throws Throwable */ public function pageToPdf(Page $page): string { $page->html = (new PageContent($page))->render(); $html = view('exports.page', [ 'page' => $page, 'format' => 'pdf', 'engine' => $this->pdfGenerator->getActiveEngine(), 'locale' => user()->getLocale(), ])->render(); return $this->htmlToPdf($html); } /** * Convert a chapter to a PDF file. * * @throws Throwable */ public function chapterToPdf(Chapter $chapter): string { $pages = $chapter->getVisiblePages(); $pages->each(function ($page) { $page->html = (new PageContent($page))->render(); }); $html = view('exports.chapter', [ 'chapter' => $chapter, 'pages' => $pages, 'format' => 'pdf', 'engine' => $this->pdfGenerator->getActiveEngine(), 'locale' => user()->getLocale(), ])->render(); return $this->htmlToPdf($html); } /** * Convert a book to a PDF file. * * @throws Throwable */ public function bookToPdf(Book $book): string { $bookTree = (new BookContents($book))->getTree(false, true); $html = view('exports.book', [ 'book' => $book, 'bookChildren' => $bookTree, 'format' => 'pdf', 'engine' => $this->pdfGenerator->getActiveEngine(), 'locale' => user()->getLocale(), ])->render(); return $this->htmlToPdf($html); } /** * Convert normal web-page HTML to a PDF. * * @throws Exception */ protected function htmlToPdf(string $html): string { $html = $this->containHtml($html); $html = $this->replaceIframesWithLinks($html); $html = $this->openDetailElements($html); return $this->pdfGenerator->fromHtml($html); } /** * Within the given HTML content, Open any detail blocks. */ protected function openDetailElements(string $html): string { libxml_use_internal_errors(true); $doc = new DOMDocument(); $doc->loadHTML(mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8')); $xPath = new DOMXPath($doc); $details = $xPath->query('//details'); /** @var DOMElement $detail */ foreach ($details as $detail) { $detail->setAttribute('open', 'open'); } return $doc->saveHTML(); } /** * Within the given HTML content, replace any iframe elements * with anchor links within paragraph blocks. */ protected function replaceIframesWithLinks(string $html): string { libxml_use_internal_errors(true); $doc = new DOMDocument(); $doc->loadHTML(mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8')); $xPath = new DOMXPath($doc); $iframes = $xPath->query('//iframe'); /** @var DOMElement $iframe */ foreach ($iframes as $iframe) { $link = $iframe->getAttribute('src'); if (str_starts_with($link, '//')) { $link = 'https:' . $link; } $anchor = $doc->createElement('a', $link); $anchor->setAttribute('href', $link); $paragraph = $doc->createElement('p'); $paragraph->appendChild($anchor); $iframe->parentNode->replaceChild($paragraph, $iframe); } return $doc->saveHTML(); } /** * Bundle of the contents of a html file to be self-contained. * * @throws Exception */ protected function containHtml(string $htmlContent): string { $imageTagsOutput = []; preg_match_all("/\/i", $htmlContent, $imageTagsOutput); // Replace image src with base64 encoded image strings if (isset($imageTagsOutput[0]) && count($imageTagsOutput[0]) > 0) { foreach ($imageTagsOutput[0] as $index => $imgMatch) { $oldImgTagString = $imgMatch; $srcString = $imageTagsOutput[2][$index]; $imageEncoded = $this->imageService->imageUriToBase64($srcString); if ($imageEncoded === null) { $imageEncoded = $srcString; } $newImgTagString = str_replace($srcString, $imageEncoded, $oldImgTagString); $htmlContent = str_replace($oldImgTagString, $newImgTagString, $htmlContent); } } $linksOutput = []; preg_match_all("/\/i", $htmlContent, $linksOutput); // Update relative links to be absolute, with instance url if (isset($linksOutput[0]) && count($linksOutput[0]) > 0) { foreach ($linksOutput[0] as $index => $linkMatch) { $oldLinkString = $linkMatch; $srcString = $linksOutput[2][$index]; if (!str_starts_with(trim($srcString), 'http')) { $newSrcString = url($srcString); $newLinkString = str_replace($srcString, $newSrcString, $oldLinkString); $htmlContent = str_replace($oldLinkString, $newLinkString, $htmlContent); } } } return $htmlContent; } /** * Converts the page contents into simple plain text. * This method filters any bad looking content to provide a nice final output. */ public function pageToPlainText(Page $page): string { $html = (new PageContent($page))->render(); $text = strip_tags($html); // Replace multiple spaces with single spaces $text = preg_replace('/\ {2,}/', ' ', $text); // Reduce multiple horrid whitespace characters. $text = preg_replace('/(\x0A|\xA0|\x0A|\r|\n){2,}/su', "\n\n", $text); $text = html_entity_decode($text); // Add title $text = $page->name . "\n\n" . $text; return $text; } /** * Convert a chapter into a plain text string. */ public function chapterToPlainText(Chapter $chapter): string { $text = $chapter->name . "\n\n"; $text .= $chapter->description . "\n\n"; foreach ($chapter->getVisiblePages() as $page) { $text .= $this->pageToPlainText($page); } return $text; } /** * Convert a book into a plain text string. */ public function bookToPlainText(Book $book): string { $bookTree = (new BookContents($book))->getTree(false, false); $text = $book->name . "\n\n"; foreach ($bookTree as $bookChild) { if ($bookChild->isA('chapter')) { $text .= $this->chapterToPlainText($bookChild); } else { $text .= $this->pageToPlainText($bookChild); } } return $text; } /** * Convert a page to a Markdown file. */ public function pageToMarkdown(Page $page): string { if ($page->markdown) { return '# ' . $page->name . "\n\n" . $page->markdown; } return '# ' . $page->name . "\n\n" . (new HtmlToMarkdown($page->html))->convert(); } /** * Convert a chapter to a Markdown file. */ public function chapterToMarkdown(Chapter $chapter): string { $text = '# ' . $chapter->name . "\n\n"; $text .= $chapter->description . "\n\n"; foreach ($chapter->pages as $page) { $text .= $this->pageToMarkdown($page) . "\n\n"; } return trim($text); } /** * Convert a book into a plain text string. */ public function bookToMarkdown(Book $book): string { $bookTree = (new BookContents($book))->getTree(false, true); $text = '# ' . $book->name . "\n\n"; foreach ($bookTree as $bookChild) { if ($bookChild instanceof Chapter) { $text .= $this->chapterToMarkdown($bookChild) . "\n\n"; } else { $text .= $this->pageToMarkdown($bookChild) . "\n\n"; } } return trim($text); } }