safechat/html/send.php

<?php
try {
  require_once("usertable.php");
  $user = $db->real_escape_string($_REQUEST['user']);
  $msg = $db->real_escape_string($_REQUEST['msg']);
  $pgp = gnupg_init();
  if (!$pgp) {
    echo json_encode(array('success' => false, 'txt' => "pgp on server failed"));
  } else {
    $q = $db->query("select pubkey from user where name='$user';");
    if (!$q || $q->num_rows!=1) {
      echo json_encode(array('success' => false, 'txt' => "user not found on server"));
    } else {
      $pubkey = gnupg_import($pgp, $q->fetch_row()[0]);
      if (!$pubkey) {
        echo json_encode(array('success' => false, 'txt' => "wrong identity"));
      } else {
        require_once("messagetable.php");
        $q = $db->query("insert into message (user, msg) values ('$user', '$msg');");
        if ($q) {
          echo json_encode(array('success' => true, 'txt' => "message stored"));
        } else {
          error_log("Error storing message: ".$db->error);
          echo json_encode(array('success' => false, 'txt' => "storing message failed"));
        }
      }
    }
  }
} catch (Exception $e) {
  error_log("Error storing message: ".$e->message);
  echo json_encode(array('success' => false, 'txt' => "storing message failed"));
}

?>