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PHP code example of legalthings / authorizer

1. Go to this page and download the library: Download legalthings/authorizer library. Choose the download type require.

2. Extract the ZIP file and open the index.php.

3. Add this code to the index.php.

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

legalthings / authorizer example snippets


use LegalThings/Authorizer;

Authorizer::$globalSecret = 'some-secret-which-stays-the-same'; 

$pdf = basename($_GET['pdf']);

if (isset($_GET['authzgen'])) {
  if (parse_url($_GET['authzgen'], PHP_URL_HOST) !== 'system-b.example.com') {
    http_response_code(403);
    echo "Will only grant access for system-b.example.com";
    exit();
  }

  $encryptedToken = Authorizer::sign($pdf, $_GET['authzgen']); // authzgen is a string with the format: {{public_key_url}};{{time_from}};{{time_to}}
  
  header('Content-Type: text/plain');
  echo $encryptedToken;
  exit();
}

$mayAccess = isset($_GET['authz']) && Authorizer::verify($pdf, $_GET['authz']); // authz is the decrypted secret

if (!$mayAccess) {
  http_response_code(403);
  echo "Access denied";
  exit();
}

// Get and output resource
header('Content-Type: application/pdf');
readfile('path/to/resources/' . $pdf);


use LegalThings/Authorizer;

$link = $_POST['link'];

if (isset($_POST['token'])) {
  $encryptedToken = $_POST['token'];
  $token = Authorizer::decrypt($encryptedSecret, 'path/to/private_key.pem');
  $link .= (strstr($link, '?') ? '&' : '?') . 'authz=' . $token;
}

$pdf = file_get_contents($link);

// Let's do something with the PDF
$username = $_SESSION['username'];
file_put_contents("../userdata/$username/" . md5(microtime()) . ".pdf", $pdf);