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<?php |
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/** |
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* bookmarks helper for pdfcpu wrapper |
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* |
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* @copyright 2014-2024 Institute of Legal Medicine, Medical University of Innsbruck |
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* @author Andreas Erhard <[email protected]> |
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* @license LGPL-3.0-only |
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* @link http://www.gerichtsmedizin.at/ |
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* |
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* @package pdftk |
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*/ |
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namespace Gmi\Toolkit\Pdftk; |
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use Gmi\Toolkit\Pdftk\Exception\FileNotFoundException; |
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use Gmi\Toolkit\Pdftk\Exception\PdfException; |
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use Gmi\Toolkit\Pdftk\Util\Escaper; |
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use Gmi\Toolkit\Pdftk\Util\FileChecker; |
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use Gmi\Toolkit\Pdftk\Util\ProcessFactory; |
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use Exception; |
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/** |
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* Bookmarks helper for pdfcpu wrapper. |
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* |
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* This class encapsulates the complexity of pdfcpu bookmark handling to reduce complexity of the PdfcpuWrapper. |
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* |
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* @internal |
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*/ |
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class PdfcpuWrapperBookmarksHelper |
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{ |
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use BinaryPathAwareTrait; |
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/** |
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* @var ProcessFactory |
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*/ |
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private $processFactory; |
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/** |
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* @var Escaper |
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*/ |
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private $escaper; |
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/** |
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* @var FileChecker |
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*/ |
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private $fileChecker; |
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/** |
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* Constructor. |
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* |
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* @throws FileNotFoundException |
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*/ |
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public function __construct(string $pdftkBinaryPath, ProcessFactory $processFactory) |
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{ |
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$this->binaryPath = $pdftkBinaryPath; |
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$this->processFactory = $processFactory; |
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$this->escaper = new Escaper(); |
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$this->fileChecker = new FileChecker(); |
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} |
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/** |
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* @see WrapperInterface::applyBookmarks() |
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*/ |
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public function applyBookmarks(Bookmarks $bookmarks, string $infile, string $outfile = null): void |
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{ |
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$temporaryOutFile = false; |
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$this->fileChecker->checkPdfFileExists($infile); |
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$bookmarksJson = $this->exportBookmarksToJson($bookmarks); |
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$tempfile = tempnam(sys_get_temp_dir(), 'bookmarks') . '.json'; |
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file_put_contents($tempfile, $bookmarksJson); |
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if ($outfile === null || $infile === $outfile) { |
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$temporaryOutFile = true; |
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$outfile = tempnam(sys_get_temp_dir(), 'pdf') . '.pdf'; |
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} |
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$cmd = sprintf( |
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'%s bookmarks import -replace %s %s %s', |
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$this->getBinary(), |
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$this->escaper->shellArg($infile), |
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$this->escaper->shellArg($tempfile), |
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$this->escaper->shellArg($outfile) |
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); |
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$process = $this->processFactory->createProcess($cmd); |
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try { |
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$process->mustRun(); |
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} catch (Exception $e) { |
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$exception = new PdfException( |
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sprintf('Failed to write PDF bookmarks to "%s"! Error: %s', $outfile, $e->getMessage()), |
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0, |
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$e, |
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$process->getErrorOutput(), |
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$process->getOutput() |
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); |
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} |
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unlink($tempfile); |
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if ($temporaryOutFile && !isset($exception)) { |
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unlink($infile); |
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rename($outfile, $infile); |
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} |
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if (isset($exception)) { |
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throw $exception; |
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} |
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} |
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/** |
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* @see WrapperInterface::importBookmarks() |
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*/ |
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public function importBookmarks(Bookmarks $bookmarks, string $infile): void |
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{ |
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$tempBookmarksFile = tempnam(sys_get_temp_dir(), 'bookmarks') . '.json'; |
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$this->fileChecker->checkPdfFileExists($infile); |
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$cmd = sprintf( |
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'%s bookmarks export %s %s', |
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$this->getBinary(), |
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$this->escaper->shellArg($infile), |
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$this->escaper->shellArg($tempBookmarksFile) |
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); |
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$process = $this->processFactory->createProcess($cmd); |
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try { |
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$process->mustRun(); |
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} catch (Exception $e) { |
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$exception = new PdfException( |
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sprintf('Failed to read bookmarks data from "%s"! Error: %s', $infile, $e->getMessage()), |
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0, |
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$e, |
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$process->getErrorOutput(), |
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$process->getOutput() |
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); |
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} |
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if (isset($exception) && false === strpos($process->getErrorOutput(), 'no outlines available')) { |
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@unlink($tempBookmarksFile); |
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throw $exception; |
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} |
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$this->importBookmarksFromJson($bookmarks, @file_get_contents($tempBookmarksFile) ?: ''); |
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@unlink($tempBookmarksFile); |
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} |
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/** |
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* Imports bookmarks from a pdfcpu bookmark JSON file. |
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*/ |
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private function importBookmarksFromJson(Bookmarks $bookmarks, string $json): void |
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{ |
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$raw = json_decode($json, true); |
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$bookmarksArray = $raw['bookmarks'] ?? []; |
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$this->parseBookmarksTree($bookmarks, $bookmarksArray); |
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} |
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/** |
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* Recursively traverse the bookmarks array and add the bookmarks appropriately. |
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*/ |
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private function parseBookmarksTree(Bookmarks $bookmarks, array $arr, int $level = 1): void |
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{ |
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foreach ($arr as $current) { |
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$bookmark = new Bookmark(); |
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$bookmark |
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->setTitle($current['title']) |
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->setPageNumber($current['page']) |
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->setLevel($level) |
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; |
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$bookmarks->add($bookmark); |
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if (isset($current['kids'])) { |
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$this->parseBookmarksTree($bookmarks, $current['kids'], $level + 1); |
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} |
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} |
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} |
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/** |
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* Exports bookmarks to a pdfcpu bookmark JSON file. |
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*/ |
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private function exportBookmarksToJson(Bookmarks $bookmarks): string |
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{ |
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$bookmarksRecursiveArray = $this->buildBookmarksTree($this->buildBookmarksArrayForTree($bookmarks)); |
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return json_encode(['bookmarks' => $bookmarksRecursiveArray], JSON_PRETTY_PRINT); |
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} |
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/** |
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* Recursively build the JSON tree based on the normalized bookmarks array. |
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*/ |
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private function buildBookmarksTree(array $bookmarksArray, int $parentId = null): array |
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{ |
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$result = []; |
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foreach ($bookmarksArray as $bookmarkItem) { |
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if ($bookmarkItem['__parent'] === $parentId) { |
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$children = $this->buildBookmarksTree($bookmarksArray, $bookmarkItem['__id']); |
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if ($children) { |
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$bookmarkItem['kids'] = $children; |
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} |
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foreach ($bookmarkItem as $key => $value) { |
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if (strpos($key, "__") === 0) { |
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unset($bookmarkItem[$key]); |
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} |
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} |
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$result[] = $bookmarkItem; |
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} |
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} |
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return $result; |
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} |
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/** |
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* Builds an array with additional entries prefixed with "__" for level, id and parent id. |
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*/ |
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private function buildBookmarksArrayForTree(Bookmarks $bookmarks): array |
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{ |
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$bookmarksArray = []; |
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$b = $bookmarks->all(); |
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$bookmarksCount = count($b); |
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$indexParent = null; |
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for ($i = 0; $i < $bookmarksCount; $i++) { |
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$bookmark = $b[$i]; |
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$prevBookmark = $b[$i - 1] ?? null; |
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// bookmark has a higher level (is deeper down) than the previous one |
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if ($prevBookmark && $prevBookmark->getLevel() < $bookmark->getLevel()) { |
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$indexParent = $i - 1; |
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// bookmark has a lower level (is higher up) than the previous one |
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} elseif ($prevBookmark && $prevBookmark->getLevel() > $bookmark->getLevel()) { |
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$indexParent = $this->getLastParentId($bookmarksArray, $bookmark->getLevel()) ?? null; |
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} |
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$bookmarksArray[] = [ |
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'title' => $bookmark->getTitle(), |
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'page' => $bookmark->getPageNumber(), |
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'__level' => $bookmark->getLevel(), |
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'__id' => $i, |
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'__parent' => $indexParent, |
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]; |
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} |
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return $bookmarksArray; |
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} |
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/** |
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* Returns the id of the last bookmark with a lower level than the provided current level. |
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*/ |
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private function getLastParentId(array $bookmarksArray, int $currentLevel): ?int |
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{ |
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for ($j = count($bookmarksArray) - 1; $j >= 0; $j--) { |
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if ($bookmarksArray[$j]['__level'] < $currentLevel) { |
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return $bookmarksArray[$j]['__id']; |
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} |
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} |
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return null; |
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} |
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} |
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gmitirol /
toolkit-pdftk
