<?php

/**
 * Validates a host according to the IPv4, IPv6 and DNS (future) specifications.
 */
class HTMLPurifier_AttrDef_URI_Host extends HTMLPurifier_AttrDef
{

    /**
     * IPv4 sub-validator.
     * @type HTMLPurifier_AttrDef_URI_IPv4
     */
    protected $ipv4;

    /**
     * IPv6 sub-validator.
     * @type HTMLPurifier_AttrDef_URI_IPv6
     */
    protected $ipv6;

    public function __construct()
    {
        $this->ipv4 = new HTMLPurifier_AttrDef_URI_IPv4();
        $this->ipv6 = new HTMLPurifier_AttrDef_URI_IPv6();
    }

    /**
     * @param string $string
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return bool|string
     */
    public function validate($string, $config, $context)
    {
        $length = strlen($string);
        // empty hostname is OK; it's usually semantically equivalent:
        // the default host as defined by a URI scheme is used:
        //
        //      If the URI scheme defines a default for host, then that
        //      default applies when the host subcomponent is undefined
        //      or when the registered name is empty (zero length).
        if ($string === '') {
            return '';
        }
        if ($length > 1 && $string[0] === '[' && $string[$length - 1] === ']') {
            //IPv6
            $ip = substr($string, 1, $length - 2);
            $valid = $this->ipv6->validate($ip, $config, $context);
            if ($valid === false) {
                return false;
            }
            return '[' . $valid . ']';
        }

        // need to do checks on unusual encodings too
        $ipv4 = $this->ipv4->validate($string, $config, $context);
        if ($ipv4 !== false) {
            return $ipv4;
        }

        // A regular domain name.

        // This doesn't match I18N domain names, but we don't have proper IRI support,
        // so force users to insert Punycode.

        // There is not a good sense in which underscores should be
        // allowed, since it's technically not! (And if you go as
        // far to allow everything as specified by the DNS spec...
        // well, that's literally everything, modulo some space limits
        // for the components and the overall name (which, by the way,
        // we are NOT checking!).  So we (arbitrarily) decide this:
        // let's allow underscores wherever we would have allowed
        // hyphens, if they are enabled.  This is a pretty good match
        // for browser behavior, for example, a large number of browsers
        // cannot handle foo_.example.com, but foo_bar.example.com is
        // fairly well supported.
        $underscore = $config->get('Core.AllowHostnameUnderscore') ? '_' : '';

        // Based off of RFC 1738, but amended so that
        // as per RFC 3696, the top label need only not be all numeric.
        // The productions describing this are:
        $a   = '[a-z]';     // alpha
        $an  = '[a-z0-9]';  // alphanum
        $and = "[a-z0-9-$underscore]"; // alphanum | "-"
        // domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum
        $domainlabel = "$an(?:$and*$an)?";
        // AMENDED as per RFC 3696
        // toplabel    = alphanum | alphanum *( alphanum | "-" ) alphanum
        //      side condition: not all numeric
        $toplabel = "$an(?:$and*$an)?";
        // hostname    = *( domainlabel "." ) toplabel [ "." ]
        if (preg_match("/^(?:$domainlabel\.)*($toplabel)\.?$/i", $string, $matches)) {
            if (!ctype_digit($matches[1])) {
                return $string;
            }
        }

        // PHP 5.3 and later support this functionality natively
        if (function_exists('idn_to_ascii')) {
            if (defined('IDNA_NONTRANSITIONAL_TO_ASCII') && defined('INTL_IDNA_VARIANT_UTS46')) {
                $string = idn_to_ascii($string, IDNA_NONTRANSITIONAL_TO_ASCII, INTL_IDNA_VARIANT_UTS46);
            } else {
                $string = idn_to_ascii($string);
            }

        // If we have Net_IDNA2 support, we can support IRIs by
        // punycoding them. (This is the most portable thing to do,
        // since otherwise we have to assume browsers support
        } elseif ($config->get('Core.EnableIDNA') && class_exists('Net_IDNA2')) {
            $idna = new Net_IDNA2(array('encoding' => 'utf8', 'overlong' => false, 'strict' => true));
            // we need to encode each period separately
            $parts = explode('.', $string);
            try {
                $new_parts = array();
                foreach ($parts as $part) {
                    $encodable = false;
                    for ($i = 0, $c = strlen($part); $i < $c; $i++) {
                        if (ord($part[$i]) > 0x7a) {
                            $encodable = true;
                            break;
                        }
                    }
                    if (!$encodable) {
                        $new_parts[] = $part;
                    } else {
                        $new_parts[] = $idna->encode($part);
                    }
                }
                $string = implode('.', $new_parts);
            } catch (Exception $e) {
                // XXX error reporting
            }
        }
        // Try again
        if (preg_match("/^($domainlabel\.)*$toplabel\.?$/i", $string)) {
            return $string;
        }
        return false;
    }
}

// vim: et sw=4 sts=4

• [D] Email
• [F] Email.php
  Delete
• [F] Host.php
  Delete
• [F] IPv4.php
  Delete
• [F] IPv6.php
  Delete

About Section

About NFC Pay: Our Story and Mission

NFC Pay was founded with a vision to transform the way people handle transactions. Our journey is defined by a commitment to innovation, security, and convenience. We strive to deliver seamless, user-friendly payment solutions that make everyday transactions effortless and secure. Our mission is to empower you to pay with ease and confidence, anytime, anywhere.

• Simplifying Payments, One Tap at a Time.
• Reinventing Your Wallet for Modern Convenience.
• Smart Payments for a Effortless Lifestyle.
• Experience the Ease of Tap and Pay.
• Innovative Solutions for Your Daily Transactions.

FAQ Section

Frequently Asked Questions About NFC Pay

Here are answers to some common questions about NFC Pay. We aim to provide clear and concise information to help you understand how our platform works and how it can benefit you. If you have any further inquiries, please don’t hesitate to contact our support team.

How do I register for NFC Pay?

Download the app and sign up using your email or phone number, then complete the verification process.

Is my payment information secure?

Yes, we use advanced encryption and security protocols to protect your payment details.

Can I add multiple cards to my NFC Pay wallet?

Absolutely, you can link multiple debit or credit cards to your wallet.

How do I transfer money to another user?

Go to the transfer section, select the recipient, enter the amount, and authorize the transfer.

What should I do if I forget my PIN?

Use the “Forgot PIN” feature in the app to reset it following the provided instructions.

How can I activate my merchant account?

Sign up for a merchant account through the app and follow the setup instructions to start accepting payments.

Can I track my payment status?

Yes, you can view and track your payment status in the account dashboard