<?php

declare(strict_types=1);

namespace GuzzleHttp\UriTemplate;

/**
 * Expands URI templates. Userland implementation of PECL uri_template.
 *
 * @see https://datatracker.ietf.org/doc/html/rfc6570
 */
final class UriTemplate
{
    /**
     * @var array<string, array{prefix:string, joiner:string, query:bool}> Hash for quick operator lookups
     */
    private static $operatorHash = [
        '' => ['prefix' => '', 'joiner' => ',', 'query' => false],
        '+' => ['prefix' => '', 'joiner' => ',', 'query' => false],
        '#' => ['prefix' => '#', 'joiner' => ',', 'query' => false],
        '.' => ['prefix' => '.', 'joiner' => '.', 'query' => false],
        '/' => ['prefix' => '/', 'joiner' => '/', 'query' => false],
        ';' => ['prefix' => ';', 'joiner' => ';', 'query' => true],
        '?' => ['prefix' => '?', 'joiner' => '&', 'query' => true],
        '&' => ['prefix' => '&', 'joiner' => '&', 'query' => true],
    ];

    /**
     * @var string[] Delimiters
     */
    private static $delims = [
        ':',
        '/',
        '?',
        '#',
        '[',
        ']',
        '@',
        '!',
        '$',
        '&',
        '\'',
        '(',
        ')',
        '*',
        '+',
        ',',
        ';',
        '=',
    ];

    /**
     * @var string[] Percent encoded delimiters
     */
    private static $delimsPct = [
        '%3A',
        '%2F',
        '%3F',
        '%23',
        '%5B',
        '%5D',
        '%40',
        '%21',
        '%24',
        '%26',
        '%27',
        '%28',
        '%29',
        '%2A',
        '%2B',
        '%2C',
        '%3B',
        '%3D',
    ];

    /**
     * @param array<string,mixed> $variables Variables to use in the template expansion
     *
     * @throws \RuntimeException
     */
    public static function expand(string $template, array $variables): string
    {
        if (false === \strpos($template, '{')) {
            return $template;
        }

        /** @var string|null */
        $result = \preg_replace_callback(
            '/\{([^\}]+)\}/',
            self::expandMatchCallback($variables),
            $template
        );

        if (null === $result) {
            throw new \RuntimeException(\sprintf('Unable to process template: %s', \preg_last_error_msg()));
        }

        return $result;
    }

    /**
     * @param array<string,mixed> $variables Variables to use in the template expansion
     *
     * @return callable(string[]): string
     */
    private static function expandMatchCallback(array $variables): callable
    {
        return static function (array $matches) use ($variables): string {
            return self::expandMatch($matches, $variables);
        };
    }

    /**
     * Process an expansion
     *
     * @param array<string,mixed> $variables Variables to use in the template expansion
     * @param string[]            $matches   Matches met in the preg_replace_callback
     *
     * @return string Returns the replacement string
     */
    private static function expandMatch(array $matches, array $variables): string
    {
        $replacements = [];
        $parsed = self::parseExpression($matches[1]);
        $prefix = self::$operatorHash[$parsed['operator']]['prefix'];
        $joiner = self::$operatorHash[$parsed['operator']]['joiner'];
        $useQuery = self::$operatorHash[$parsed['operator']]['query'];
        $allUndefined = true;

        foreach ($parsed['values'] as $value) {
            if (!isset($variables[$value['value']])) {
                continue;
            }

            $variable = $variables[$value['value']];
            $actuallyUseQuery = $useQuery;
            $expanded = '';

            if (\is_array($variable)) {
                $isAssoc = self::isAssoc($variable);
                $kvp = [];
                /** @var mixed $var */
                foreach ($variable as $key => $var) {
                    if ($isAssoc) {
                        $key = \rawurlencode((string) $key);
                        $isNestedArray = \is_array($var);
                    } else {
                        $isNestedArray = false;
                    }

                    if (!$isNestedArray) {
                        $var = \rawurlencode((string) $var);
                        if ($parsed['operator'] === '+' || $parsed['operator'] === '#') {
                            $var = self::decodeReserved($var);
                        }
                    }

                    if ($value['modifier'] === '*') {
                        if ($isAssoc) {
                            if ($isNestedArray) {
                                // Nested arrays must allow for deeply nested structures.
                                $var = \http_build_query([$key => $var], '', '&', \PHP_QUERY_RFC3986);
                            } else {
                                $var = \sprintf('%s=%s', (string) $key, (string) $var);
                            }
                        } elseif ($key > 0 && $actuallyUseQuery) {
                            $var = \sprintf('%s=%s', $value['value'], (string) $var);
                        }
                    }

                    /** @var string $var */
                    $kvp[$key] = $var;
                }

                if (0 === \count($variable)) {
                    $actuallyUseQuery = false;
                } elseif ($value['modifier'] === '*') {
                    $expanded = \implode($joiner, $kvp);
                    if ($isAssoc) {
                        // Don't prepend the value name when using the explode
                        // modifier with an associative array.
                        $actuallyUseQuery = false;
                    }
                } else {
                    if ($isAssoc) {
                        // When an associative array is encountered and the
                        // explode modifier is not set, then the result must be
                        // a comma separated list of keys followed by their
                        // respective values.
                        foreach ($kvp as $k => &$v) {
                            $v = \sprintf('%s,%s', $k, $v);
                        }
                    }
                    $expanded = \implode(',', $kvp);
                }
            } else {
                $allUndefined = false;
                if ($value['modifier'] === ':' && isset($value['position'])) {
                    $variable = \substr((string) $variable, 0, $value['position']);
                }
                $expanded = \rawurlencode((string) $variable);
                if ($parsed['operator'] === '+' || $parsed['operator'] === '#') {
                    $expanded = self::decodeReserved($expanded);
                }
            }

            if ($actuallyUseQuery) {
                if ($expanded === '' && $joiner !== '&') {
                    $expanded = $value['value'];
                } else {
                    $expanded = \sprintf('%s=%s', $value['value'], $expanded);
                }
            }

            $replacements[] = $expanded;
        }

        $ret = \implode($joiner, $replacements);

        if ('' === $ret) {
            // Spec section 3.2.4 and 3.2.5
            if (false === $allUndefined && ('#' === $prefix || '.' === $prefix)) {
                return $prefix;
            }
        } else {
            if ('' !== $prefix) {
                return \sprintf('%s%s', $prefix, $ret);
            }
        }

        return $ret;
    }

    /**
     * Parse an expression into parts
     *
     * @param string $expression Expression to parse
     *
     * @return array{operator:string, values:array<array{value:string, modifier:(''|'*'|':'), position?:int}>}
     */
    private static function parseExpression(string $expression): array
    {
        $result = [];

        if (isset(self::$operatorHash[$expression[0]])) {
            $result['operator'] = $expression[0];
            /** @var string */
            $expression = \substr($expression, 1);
        } else {
            $result['operator'] = '';
        }

        $result['values'] = [];
        foreach (\explode(',', $expression) as $value) {
            $value = \trim($value);
            $varspec = [];
            if ($colonPos = \strpos($value, ':')) {
                $varspec['value'] = (string) \substr($value, 0, $colonPos);
                $varspec['modifier'] = ':';
                $varspec['position'] = (int) \substr($value, $colonPos + 1);
            } elseif (\substr($value, -1) === '*') {
                $varspec['modifier'] = '*';
                $varspec['value'] = (string) \substr($value, 0, -1);
            } else {
                $varspec['value'] = $value;
                $varspec['modifier'] = '';
            }
            $result['values'][] = $varspec;
        }

        return $result;
    }

    /**
     * Determines if an array is associative.
     *
     * This makes the assumption that input arrays are sequences or hashes.
     * This assumption is a tradeoff for accuracy in favor of speed, but it
     * should work in almost every case where input is supplied for a URI
     * template.
     */
    private static function isAssoc(array $array): bool
    {
        return $array && \array_keys($array)[0] !== 0;
    }

    /**
     * Removes percent encoding on reserved characters (used with + and #
     * modifiers).
     */
    private static function decodeReserved(string $string): string
    {
        return \str_replace(self::$delimsPct, self::$delims, $string);
    }
}

• [F] UriTemplate.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