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pdfsigni.php
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pdfsigni.php
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#!/usr/bin/env php
<?php
/*
This file is part of SAPP
Simple and Agnostic PDF Parser (SAPP) - Parse PDF documents in PHP (and update them)
Copyright (C) 2020 - Carlos de Alfonso (caralla76@gmail.com)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
use ddn\sapp\PDFDoc;
require_once('vendor/autoload.php');
if ($argc !== 4)
fwrite(STDERR, sprintf("usage: %s <filename> <image> <certfile>", $argv[0]));
else {
if (!file_exists($argv[1]))
fwrite(STDERR, "failed to open file " . $argv[1]);
else {
// Silently prompt for the password
fwrite(STDERR, "Password: ");
system('stty -echo');
$password = trim(fgets(STDIN));
system('stty echo');
fwrite(STDERR, "\n");
$file_content = file_get_contents($argv[1]);
$obj = PDFDoc::from_string($file_content);
if ($obj === false)
fwrite(STDERR, "failed to parse file " . $argv[1]);
else {
$position = [ ];
$image = $argv[2];
$imagesize = @getimagesize($image);
if ($imagesize === false) {
fwrite(STDERR, "failed to open the image $image");
return;
}
$pagesize = $obj->get_page_size(0);
if ($pagesize === false)
return p_error("failed to get page size");
$pagesize = explode(" ", $pagesize[0]->val());
// Calculate the position of the image according to its size and the size of the page;
// the idea is to keep the aspect ratio and center the image in the page with a size
// of 1/3 of the size of the page.
$p_x = intval("". $pagesize[0]);
$p_y = intval("". $pagesize[1]);
$p_w = intval("". $pagesize[2]) - $p_x;
$p_h = intval("". $pagesize[3]) - $p_y;
$i_w = $imagesize[0];
$i_h = $imagesize[1];
$ratio_x = $p_w / $i_w;
$ratio_y = $p_h / $i_h;
$ratio = min($ratio_x, $ratio_y);
$i_w = ($i_w * $ratio) / 3;
$i_h = ($i_h * $ratio) / 3;
$p_x = $p_w / 3;
$p_y = $p_h / 3;
// Set the image appearance and the certificate file
$obj->set_signature_appearance(0, [ $p_x, $p_y, $p_x + $i_w, $p_y + $i_h ], $image);
if (!$obj->set_signature_certificate($argv[3], $password)) {
fwrite(STDERR, "the certificate is not valid");
} else {
$docsigned = $obj->to_pdf_file_s();
if ($docsigned === false)
fwrite(STDERR, "could not sign the document");
else
echo $docsigned;
}
}
}
}