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andreyvit/1_fpdi_with_annots.php

Last active February 21, 2020 10:05
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1_fpdi_with_annots.php
<?php
require_once 'pdflib/fpdf.php';
require_once 'pdflib/fpdi.php';
// FPDI extension that preserves hyperlinks when copying PDF pages.
//
// (c) 2012, Andrey Tarantsov <[email protected]>, provided under the MIT license.
//
// Published at: https://gist.github.com/2020422
//
// Note: the free version of FPDI requires unprotected PDFs conforming to spec version 1.4.
// I use qpdf (http://qpdf.sourceforge.net/) to preprocess PDFs before running through this
// code, invoking it like this:
//
// qpdf --decrypt --stream-data=uncompress --force-version=1.4 src.pdf temp.pdf
//
// then, after processing temp.pdf into out.pdf with FPDI, I run the following to re-establish
// protection:
//
// qpdf --encrypt "" "" 40 --extract=n -- out.pdf final.pdf
//
// Here's an example class that uses FDPI to append another PDF file, adding a message to each page:
//
// class MyPdfProcessor extends FPDI_with_annots {
//
// function concat($file, $message) {
// $pagecount = $this->setSourceFile($file);
// for ($i = 1; $i <= $pagecount; $i++) {
// $tplidx = $this->ImportPage($i);
// $s = $this->getTemplatesize($tplidx);
// $this->AddPage('P', array($s['w'], $s['h']));
// $this->useTemplate($tplidx);
//
// // header
// $this->SetAutoPageBreak(FALSE);
// $this->SetXY(6, -28);
// $this->Rotate(90);
// $this->SetTextColor(102, 102, 102);
// $this->SetFont('Arial', '', 8);
// $this->Cell(0, 5, utf8_decode($message),'',1,'L');
// $this->Rotate(0); // outputs Q to balance "q" added by the previous call to Rotate
// }
// }
//
// }
class FPDI_with_annots extends FPDI {
// default maxdepth prevents an infinite recursion on malformed PDFs (not theoretical, actually found in the wild)
function resolve(&$parser, $smt, $maxdepth=10) {
if ($maxdepth == 0)
return $smt;
if ($smt[0] == PDF_TYPE_OBJREF) {
$result = $parser->pdf_resolve_object($parser->c, $smt);
return $this->resolve($parser, $result, $maxdepth-1);
} else if ($smt[0] == PDF_TYPE_OBJECT) {
return $this->resolve($parser, $smt[1], $maxdepth-1);
} else if ($smt[0] == PDF_TYPE_ARRAY) {
$result = array();
foreach ($smt[1] as $item) {
$result[] = $this->resolve($parser, $item, $maxdepth-1);
}
$smt[1] = $result;
return $smt;
} else if ($smt[0] == PDF_TYPE_DICTIONARY) {
$result = array();
foreach ($smt[1] as $key => $item) {
$result[$key] = $this->resolve($parser, $item, $maxdepth-1);
}
$smt[1] = $result;
return $smt;
} else {
return $smt;
}
}
function findPageNoForRef(&$parser, $pageRef) {
$ref_obj = $pageRef[1]; $ref_gen = $pageRef[2];
foreach ($parser->pages as $index => $page) {
$page_obj = $page['obj']; $page_gen = $page['gen'];
if ($page_obj == $ref_obj && $page_gen == $ref_gen) {
return $index + 1;
}
}
return -1;
}
function importPage($pageno, $boxName = '/CropBox') {
$tplidx = parent::importPage($pageno, $boxName);
$tpl =& $this->tpls[$tplidx];
$parser =& $tpl['parser'];
// look for hyperlink annotations and store them in the template
if (isset($parser->pages[$pageno - 1][1][1]['/Annots'])) {
$annots = $parser->pages[$pageno - 1][1][1]['/Annots'];
$annots = $this->resolve($parser, $annots);
$links = array();
foreach ($annots[1] as $annot) if ($annot[0] == PDF_TYPE_DICTIONARY) {
// all links look like: << /Type /Annot /Subtype /Link /Rect [...] ... >>
if ($annot[1]['/Type'][1] == '/Annot' && $annot[1]['/Subtype'][1] == '/Link') {
$rect = $annot[1]['/Rect'];
if ($rect[0] == PDF_TYPE_ARRAY && count($rect[1]) == 4) {
$x = $rect[1][0][1]; $y = $rect[1][1][1];
$x2 = $rect[1][2][1]; $y2 = $rect[1][3][1];
$w = $x2 - $x; $h = $y2 - $y;
$h = -$h;
}
if (isset($annot[1]['/A'])) {
$A = $annot[1]['/A'];
if ($A[0] == PDF_TYPE_DICTIONARY && isset($A[1]['/S'])) {
$S = $A[1]['/S'];
// << /Type /Annot ... /A << /S /URI /URI ... >> >>
if ($S[1] == '/URI' && isset($A[1]['/URI'])) {
$URI = $A[1]['/URI'];
if (is_string($URI[1])) {
$uri = str_replace("\\000", '', trim($URI[1]));
if (!empty($uri)) {
$links[] = array($x, $y, $w, $h, $uri);
}
}
// << /Type /Annot ... /A << /S /GoTo /D [%d 0 R /Fit] >> >>
} else if ($S[1] == '/GoTo' && isset($A[1]['/D'])) {
$D = $A[1]['/D'];
if ($D[0] == PDF_TYPE_ARRAY && count($D[1]) > 0 && $D[1][0][0] == PDF_TYPE_OBJREF) {
$target_pageno = $this->findPageNoForRef($parser, $D[1][0]);
if ($target_pageno >= 0) {
$links[] = array($x, $y, $w, $h, $target_pageno);
}
}
}
}
} else if (isset($annot[1]['/Dest'])) {
$Dest = $annot[1]['/Dest'];
// << /Type /Annot ... /Dest [42 0 R ...] >>
if ($Dest[0] == PDF_TYPE_ARRAY && $Dest[0][1][0] == PDF_TYPE_OBJREF) {
$target_pageno = $this->findPageNoForRef($parser, $Dest[0][1][0]);
if ($target_pageno >= 0) {
$links[] = array($x, $y, $w, $h, $target_pageno);
}
}
}
}
}
$tpl['links'] = $links;
}
// echo "Links on page $pageno:\n";
// print_r($links);
return $tplidx;
}
function useTemplate($tplidx, $_x = null, $_y = null, $_w = 0, $_h = 0, $adjustPageSize = false) {
$result = parent::useTemplate($tplidx, $_x, $_y, $_w, $_h, $adjustPageSize);
// apply links from the template
$tpl =& $this->tpls[$tplidx];
if (isset($tpl['links'])) {
foreach ($tpl['links'] as $link) {
// $link[4] is either a string (external URL) or an integer (page number)
if (is_int($link[4])) {
$l = $this->AddLink();
$this->SetLink($l, 0, $link[4]);
$link[4] = $l;
}
$this->PageLinks[$this->page][] = $link;
}
}
return $result;
}
}
Raw
2_pm_pdf.php
<?php
class PM_PDF extends FPDI_with_annots {
function concat($file, $message) {
$pagecount = $this->setSourceFile($file);
for ($i = 1; $i <= $pagecount; $i++) {
$tplidx = $this->ImportPage($i);
$s = $this->getTemplatesize($tplidx);
$this->AddPage('P', array($s['w'], $s['h']));
$this->useTemplate($tplidx);
// header
$this->SetAutoPageBreak(FALSE);
// $this->SetXY(8, -13);
$this->SetXY(6, -28);
$this->Rotate(90);
$this->SetTextColor(102, 102, 102);
$this->SetFont('Arial', '', 8);
$this->Cell(0, 5, utf8_decode($message),'',1,'L');
// $this->Ln(20);
$this->Rotate(0); // outputs Q to balance "q" added by the previous call to Rotate
// footer
// $this->SetY(-20);
// $this->SetFont('Arial','I',8);
// $this->Cell(0,10,'Page ' . $this->PageNo() . '/{nb}',0,0,'C');
}
}
// http://www.phpbuilder.com/board/showthread.php?t=10318839
function Rotate($angle,$x=-1,$y=-1) {
if($x==-1)
$x=$this->x;
if($y==-1)
$y=$this->y;
if($this->angle!=0)
$this->_out('Q');
$this->angle=$angle;
if($angle!=0) {
$angle*=M_PI/180;
$c=cos($angle);
$s=sin($angle);
$cx=$x*$this->k;
$cy=($this->h-$y)*$this->k;
$this->_out(sprintf('q %.5f %.5f %.5f %.5f %.2f %.2f cm 1 0 0 1 %.2f %.2f cm',$c,$s,-$s,$c,$cx,$cy,-$cx,-$cy));
}
}
}
Raw
3_usage.php
<?php
define('XXXX_DEBUG_PDF_GENERATION_NO_DOWNLOAD_FILE', FALSE);
define('XXXX_DEBUG_PDF_GENERATION_NO_COMPRESSION_OR_ENCRYPTION', FALSE);
function xxxx_personalize_pdf($source_pdf_file, $temp_file, $output_file, $orig_filename_for_error_messages, $spotlight_restrictions) {
setlocale(LC_CTYPE, "en_US.UTF-8"); // otherwise escapeshellarg() strips non-ASCII characters
$encryption_options = '';
if ($spotlight_restrictions)
$encryption_options = '--extract=n';
$qpdf_command = sprintf('/xxxx/qpdf-2.3.1/qpdf/build/qpdf --decrypt --stream-data=uncompress --force-version=1.4 %s %s', escapeshellarg($source_pdf_file), escapeshellarg($temp_file));
$output = shell_exec($qpdf_command);
if (!file_exists($temp_file) || filesize($temp_file) == 0) {
watchdog('pm_files_download_control', "Cannot download file '{$orig_filename_for_error_messages}' because an error occurred while running qpdf (!command): !error.", array('!command' => $qpdf_command, '!error' => $output), WATCHDOG_ERROR);
drupal_set_message("Cannot download file '{$orig_filename_for_error_messages}' because an error occurred while processing PDF.", 'error');
drupal_goto('');
}
$user_name = "John Doe"; // get user name from the database
$pdf = new PM_PDF();
if (XXXX_DEBUG_PDF_GENERATION_NO_COMPRESSION_OR_ENCRYPTION)
$pdf->SetCompression(FALSE);
$pdf->concat($temp_file, "Persönliches Exemplar für {$user_name}. Bitte beachten Sie: Eine Weitergabe an Dritte ist nicht gestattet.");
$pdf->Output($temp_file, 'F');
if (XXXX_DEBUG_PDF_GENERATION_NO_COMPRESSION_OR_ENCRYPTION) {
copy($temp_file, $output_file);
} else {
$qpdf_command = sprintf('/xxxx/qpdf-2.3.1/qpdf/build/qpdf --encrypt "" "" 40 ' . $encryption_options . ' -- %s %s', escapeshellarg($temp_file), escapeshellarg($output_file));
$output = shell_exec($qpdf_command);
if (!file_exists($output_file) || filesize($output_file) == 0) {
watchdog('pm_files_download_control', "Cannot download file '{$orig_filename_for_error_messages}' because an error occurred while running qpdf (!command): !error.", array('!command' => $qpdf_command, '!error' => $output), WATCHDOG_ERROR);
drupal_set_message("Cannot download file '{$orig_filename_for_error_messages}' because an error occurred while processing PDF.", 'error');
drupal_goto('');
}
}
}
function xxxx_send_file($filename, $filepath) {
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
if (!XXXX_DEBUG_PDF_GENERATION_NO_DOWNLOAD_FILE)
header('Content-Disposition: attachment; filename=' . $filename);
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
header('Content-Length: ' . filesize($filepath));
ob_clean();
flush();
readfile($filepath);
}
// ...
if ($file->type == 'pdf') {
$temp_file_mid = tempnam($secret_folder, $file->filename);
xxxx_personalize_pdf($file->filepath, $temp_file_mid, $output_file, $file->filename, $spotlight_restrictions);
if (file_exists($temp_file_mid))
unlink($temp_file_mid);
xxxx_send_file($file->filename, $output_file);
unlink($output_file);
exit;
}
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