SetaPDF Demos PHP libraries to handle, modify or create PDF files

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<?php

use setasign\SetaPDF2\Core\DataStructure\Date;
use setasign\SetaPDF2\Core\Document;
use setasign\SetaPDF2\Core\Document\Catalog\AcroForm;
use setasign\SetaPDF2\Core\Encoding\Encoding;
use setasign\SetaPDF2\Core\Type\Dictionary\DictionaryHelper;
use setasign\SetaPDF2\Core\Type\PdfDictionary;
use setasign\SetaPDF2\Core\Type\PdfHexString;

// load and register the autoload function
require_once '../../../../../bootstrap.php';

// prepare some files
$files = [
    $assetsDirectory . '/pdfs/camtown/Laboratory-Report-signed.pdf',
    $assetsDirectory . '/pdfs/tektown/Laboratory-Report-signed.pdf',
    $assetsDirectory . '/pdfs/lenstown/Laboratory-Report-signed-PAdES.pdf',
    $assetsDirectory . '/pdfs/tektown/Order-Form.pdf',
    $assetsDirectory . '/pdfs/tektown/eBook-Invoice.pdf',
];

$path = displayFiles($files);

$document = Document::loadByFilename($path);
$terminalFields = $document->getCatalog()->getAcroForm()->getTerminalFieldsObjects();

$signatureFieldFound = false;

foreach ($terminalFields as $fieldData) {
    $fieldData = $fieldData->ensure();

    $ft = DictionaryHelper::resolveAttribute($fieldData, 'FT');
    if (!$ft || $ft->getValue() !== 'Sig') {
        continue;
    }

    $fieldName = AcroForm::resolveFieldName($fieldData);
    echo sprintf('Signature Field "%s" found! ', $fieldName);
    $signatureFieldFound = true;

    $v = DictionaryHelper::resolveAttribute($fieldData, 'V');
    if (!$v instanceof PdfDictionary) {
        echo ' But not digital signed.<br /><br />';
        continue;
    }

    echo ' Including a digital signature.<br />';

    // This is the signature value
    $signatureData = PdfHexString::ensureType(DictionaryHelper::getValue($v, 'Contents'))->getValue();
    $signatureData = rtrim($signatureData, "\0");

    echo '<a href="https://lapo.it/asn1js/#' . PdfHexString::str2hex($signatureData) . '" ' .
        'target="_blank">asn1js</a> | ';
    echo '<a href="data:application/pkcs7-mime;base64,' . base64_encode($signatureData) . '" ' .
        'download="signature.pkcs7">download</a><br />';

    echo '<br />';

    $signatureProperties = [];
    foreach (['Name', 'Location', 'ContactInfo', 'Reason', 'M'] as $property) {
        $value = DictionaryHelper::getValue($v, $property);
        if ($value === null) {
            continue;
        }

        $propertyValue = $value->getValue();
        if ($property === 'M') {
            $propertyValue = Date::stringToDateTime($propertyValue);
        } else {
            $propertyValue = Encoding::convertPdfString($propertyValue);
        }

        $signatureProperties[$property] = $propertyValue;
    }

    echo 'Signature Properties:<br/>';
    echo '<pre>';
    print_r($signatureProperties);
    echo '</pre><br /><br />';
}

if ($signatureFieldFound === false) {
    echo 'No signature field found.';
}