在PHP v7.0.27中密码保护和禁用编辑PDF

Question

我正在使用CentOS7，后端是带有Laravel框架v4.2的PHP v7.0.27。我正在使用Base64数据保存PDF（在解码base64之后）。我想用密码保护和禁用PDF编辑。我一直在寻找实现这一目标的方法，但到目前为止还没有运气，我知道可以使用Dompdf实现，但是对于HTML数据，呈现PDF是必需的。如果可以的话，请告诉我。谢谢！

下面是我用来保存PDF的代码

private function decodeBase64ToPdf($fileToReadFrom, $fileToSaveTo)
{
    $pdf_base64_handler = fopen($fileToReadFrom,'r');   //Get encoded file content from txt file
    $pdf_content = fread($pdf_base64_handler, filesize($fileToReadFrom));
    fclose($pdf_base64_handler);

    $pdf_decoded = base64_decode($pdf_content);    //Decode pdf content

    $file = fopen($fileToSaveTo,'w');  //Write decoded data to pdf file
    fwrite($file, $pdf_decoded);
    if(fclose($file))   //Close output file
    {
        return true;
    }
    return false;
}

Answer 1

经过很多不同的测试。我通过安装FPDI和FPDF解决了这一问题。链接：FPDFFPDI

private function decodeBase64ToPdf($fileToReadFrom, $fileToSaveTo)
{
    $pdf_base64_handler = fopen($fileToReadFrom,'r');   //Get encoded file content from txt file
    $pdf_content = fread($pdf_base64_handler, filesize($fileToReadFrom));
    fclose($pdf_base64_handler);

    $pdf_decoded = base64_decode($pdf_content);    //Decode pdf content

    $file = fopen($fileToSaveTo,'w');  //Write decoded data to pdf file
    fwrite($file, $pdf_decoded);
    if(fclose($file))   //Close output file
    {
        $this->passwordProtect($fileToSaveTo);
        return true;
    }
    return false;
}

private function passwordProtect($pdfPath)
{
    $passPdf = new FpdiProtection();

    //calculate the number of pages from the original document
    $pagecount = $passPdf->setSourceFile($pdfPath);

    // copy all pages from the old unprotected pdf in the new one
    for ($loop = 1; $loop <= $pagecount; $loop++)
    {
        $tplidx = $passPdf->importPage($loop);
        $passPdf->addPage();
        $passPdf->useTemplate($tplidx);
    }

    $passPdf->SetProtection(['print' => 4, 'copy' => 16], "userpass", "ownerpass");
    $passPdf->Output($pdfPath, 'F');
}