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<?php
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/**
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* @file
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* Generates the PDF version using wkhtmltopdf.
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*
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* This file is included by the print_pdf_wkhtmltopdf module and includes the
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* functions that interface with the wkhtmltopdf library.
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*
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* @ingroup print
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*/
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/**
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* Implements hook_print_pdf_generate().
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*/
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function print_pdf_wkhtmltopdf_print_pdf_generate($html, $meta, $paper_size = NULL, $page_orientation = NULL) {
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$pdf_tool = explode('|', variable_get('print_pdf_pdf_tool', PRINT_PDF_PDF_TOOL_DEFAULT));
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if (empty($paper_size)) {
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$paper_size = variable_get('print_pdf_paper_size', PRINT_PDF_PAPER_SIZE_DEFAULT);
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}
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if (empty($page_orientation)) {
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$page_orientation = variable_get('print_pdf_page_orientation', PRINT_PDF_PAGE_ORIENTATION_DEFAULT);
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}
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$wkhtmltopdf_options = variable_get('print_pdf_wkhtmltopdf_options', PRINT_PDF_WKHTMLTOPDF_OPTIONS);
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$dpi = 96;
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if (!empty($wkhtmltopdf_options) && isset($meta['node'])) {
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$wkhtmltopdf_options = token_replace($wkhtmltopdf_options, array('node' => $meta['node']), array('clear' => TRUE));
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}
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// Build array of single quoted parts, and the same escaped.
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preg_match_all("!'.+?'!", $wkhtmltopdf_options, $matches);
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$quoted = array();
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foreach ($matches[0] as $match) {
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$quoted[escapeshellcmd($match)] = $match;
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}
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// Prevent options that could result in execution of arbitrary commands.
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$wkhtmltopdf_options = escapeshellcmd($wkhtmltopdf_options);
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// Replace sections that were single quoted with original content.
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foreach ($quoted as $search => $replace) {
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$wkhtmltopdf_options = str_replace($search, $replace, $wkhtmltopdf_options);
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}
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$version = print_pdf_wkhtmltopdf_pdf_tool_version($pdf_tool[1], FALSE);
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// 0.10.0 beta2 identifies itself as 0.9.9.
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if (version_compare($version, '0.9.9', '>=')) {
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$wkhtmltopdf_options = '--disable-local-file-access ' . $wkhtmltopdf_options;
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}
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elseif (version_compare($version, '0.9.6', '>=')) {
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$wkhtmltopdf_options = '--disallow-local-file-access ' . $wkhtmltopdf_options;
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}
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else {
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drupal_goto($meta['url']);
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exit;
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}
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// Use basic http authentication to fetch included CSS, etc.
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if (isset($_SERVER['PHP_AUTH_USER']) && isset($_SERVER['PHP_AUTH_PW'])) {
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$wkhtmltopdf_options .= ' --username ' . escapeshellarg($_SERVER['PHP_AUTH_USER']) . ' --password ' . escapeshellarg($_SERVER['PHP_AUTH_PW']);
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}
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$use_input_file = variable_get('print_pdf_wkhtmltopdf_use_input_file', PRINT_PDF_WKHTMLTOPDF_USE_INPUT_FILE_DEFAULT);
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if ($use_input_file) {
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$temp_html = file_unmanaged_save_data($html, drupal_tempnam('temporary://', 'c_html_') . '.html', FILE_EXISTS_RENAME);
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if ($temp_html === FALSE) {
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watchdog('print_pdf', 'wkhtmltopdf: could not create temporary html file: %file', array('%file' => $temp_html));
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drupal_goto($meta['url']);
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return NULL;
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}
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$html_input_parameter = drupal_realpath($temp_html);
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}
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else {
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$temp_html = '';
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$html_input_parameter = '-';
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}
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$descriptor = array(
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0 => array('pipe', 'r'),
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1 => array('pipe', 'w'),
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2 => array('pipe', 'a'),
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);
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$cmd = '"' . realpath($pdf_tool[1]) . "\" -q --page-size $paper_size --orientation $page_orientation --dpi $dpi $wkhtmltopdf_options $html_input_parameter -";
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$process = proc_open($cmd, $descriptor, $pipes, NULL, NULL);
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if (is_resource($process)) {
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if (!$use_input_file) {
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fwrite($pipes[0], $html);
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fclose($pipes[0]);
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}
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$pdf = stream_get_contents($pipes[1]);
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fclose($pipes[1]);
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stream_set_blocking($pipes[2], 0);
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$error = stream_get_contents($pipes[2]);
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fclose($pipes[2]);
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$retval = proc_close($process);
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if (!empty($error) || ($retval != 0)) {
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if (empty($error)) {
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$error = 'No stderr output available.';
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}
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watchdog('print_pdf', 'wkhtmltopdf [%cmd] (returned %ret): %error',
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array('%cmd' => $cmd, '%ret' => $retval, '%error' => $error));
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}
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}
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if ($use_input_file) {
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file_unmanaged_delete($temp_html);
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}
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if (!empty($pdf)) {
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// Remove anything before actual PDF content.
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$pdf = substr($pdf, strpos($pdf, '%PDF-'));
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return $pdf;
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}
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else {
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drupal_set_message(t('Unable to generate PDF file.'), 'error');
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drupal_goto($meta['url']);
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return NULL;
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}
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}
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