<?php

namespace GuzzleHttp\Handler;

use GuzzleHttp\Exception\ConnectException;
use GuzzleHttp\Exception\RequestException;
use GuzzleHttp\Promise as P;
use GuzzleHttp\Promise\FulfilledPromise;
use GuzzleHttp\Promise\PromiseInterface;
use GuzzleHttp\Psr7;
use GuzzleHttp\TransferStats;
use GuzzleHttp\Utils;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\StreamInterface;
use Psr\Http\Message\UriInterface;

/**
 * HTTP handler that uses PHP's HTTP stream wrapper.
 *
 * @final
 */
class StreamHandler
{
    /**
     * @var array
     */
    private $lastHeaders = [];

    /**
     * Sends an HTTP request.
     *
     * @param RequestInterface $request Request to send.
     * @param array            $options Request transfer options.
     */
    public function __invoke(RequestInterface $request, array $options): PromiseInterface
    {
        // Sleep if there is a delay specified.
        if (isset($options['delay'])) {
            \usleep($options['delay'] * 1000);
        }

        $startTime = isset($options['on_stats']) ? Utils::currentTime() : null;

        try {
            // Does not support the expect header.
            $request = $request->withoutHeader('Expect');

            // Append a content-length header if body size is zero to match
            // cURL's behavior.
            if (0 === $request->getBody()->getSize()) {
                $request = $request->withHeader('Content-Length', '0');
            }

            return $this->createResponse(
                $request,
                $options,
                $this->createStream($request, $options),
                $startTime
            );
        } catch (\InvalidArgumentException $e) {
            throw $e;
        } catch (\Exception $e) {
            // Determine if the error was a networking error.
            $message = $e->getMessage();
            // This list can probably get more comprehensive.
            if (false !== \strpos($message, 'getaddrinfo') // DNS lookup failed
                || false !== \strpos($message, 'Connection refused')
                || false !== \strpos($message, "couldn't connect to host") // error on HHVM
                || false !== \strpos($message, 'connection attempt failed')
            ) {
                $e = new ConnectException($e->getMessage(), $request, $e);
            } else {
                $e = RequestException::wrapException($request, $e);
            }
            $this->invokeStats($options, $request, $startTime, null, $e);

            return P\Create::rejectionFor($e);
        }
    }

    private function invokeStats(
        array $options,
        RequestInterface $request,
        ?float $startTime,
        ResponseInterface $response = null,
        \Throwable $error = null
    ): void {
        if (isset($options['on_stats'])) {
            $stats = new TransferStats($request, $response, Utils::currentTime() - $startTime, $error, []);
            ($options['on_stats'])($stats);
        }
    }

    /**
     * @param resource $stream
     */
    private function createResponse(RequestInterface $request, array $options, $stream, ?float $startTime): PromiseInterface
    {
        $hdrs = $this->lastHeaders;
        $this->lastHeaders = [];

        try {
            [$ver, $status, $reason, $headers] = HeaderProcessor::parseHeaders($hdrs);
        } catch (\Exception $e) {
            return P\Create::rejectionFor(
                new RequestException('An error was encountered while creating the response', $request, null, $e)
            );
        }

        [$stream, $headers] = $this->checkDecode($options, $headers, $stream);
        $stream = Psr7\Utils::streamFor($stream);
        $sink = $stream;

        if (\strcasecmp('HEAD', $request->getMethod())) {
            $sink = $this->createSink($stream, $options);
        }

        try {
            $response = new Psr7\Response($status, $headers, $sink, $ver, $reason);
        } catch (\Exception $e) {
            return P\Create::rejectionFor(
                new RequestException('An error was encountered while creating the response', $request, null, $e)
            );
        }

        if (isset($options['on_headers'])) {
            try {
                $options['on_headers']($response);
            } catch (\Exception $e) {
                return P\Create::rejectionFor(
                    new RequestException('An error was encountered during the on_headers event', $request, $response, $e)
                );
            }
        }

        // Do not drain when the request is a HEAD request because they have
        // no body.
        if ($sink !== $stream) {
            $this->drain($stream, $sink, $response->getHeaderLine('Content-Length'));
        }

        $this->invokeStats($options, $request, $startTime, $response, null);

        return new FulfilledPromise($response);
    }

    private function createSink(StreamInterface $stream, array $options): StreamInterface
    {
        if (!empty($options['stream'])) {
            return $stream;
        }

        $sink = $options['sink'] ?? Psr7\Utils::tryFopen('php://temp', 'r+');

        return \is_string($sink) ? new Psr7\LazyOpenStream($sink, 'w+') : Psr7\Utils::streamFor($sink);
    }

    /**
     * @param resource $stream
     */
    private function checkDecode(array $options, array $headers, $stream): array
    {
        // Automatically decode responses when instructed.
        if (!empty($options['decode_content'])) {
            $normalizedKeys = Utils::normalizeHeaderKeys($headers);
            if (isset($normalizedKeys['content-encoding'])) {
                $encoding = $headers[$normalizedKeys['content-encoding']];
                if ($encoding[0] === 'gzip' || $encoding[0] === 'deflate') {
                    $stream = new Psr7\InflateStream(Psr7\Utils::streamFor($stream));
                    $headers['x-encoded-content-encoding'] = $headers[$normalizedKeys['content-encoding']];

                    // Remove content-encoding header
                    unset($headers[$normalizedKeys['content-encoding']]);

                    // Fix content-length header
                    if (isset($normalizedKeys['content-length'])) {
                        $headers['x-encoded-content-length'] = $headers[$normalizedKeys['content-length']];
                        $length = (int) $stream->getSize();
                        if ($length === 0) {
                            unset($headers[$normalizedKeys['content-length']]);
                        } else {
                            $headers[$normalizedKeys['content-length']] = [$length];
                        }
                    }
                }
            }
        }

        return [$stream, $headers];
    }

    /**
     * Drains the source stream into the "sink" client option.
     *
     * @param string $contentLength Header specifying the amount of
     *                              data to read.
     *
     * @throws \RuntimeException when the sink option is invalid.
     */
    private function drain(StreamInterface $source, StreamInterface $sink, string $contentLength): StreamInterface
    {
        // If a content-length header is provided, then stop reading once
        // that number of bytes has been read. This can prevent infinitely
        // reading from a stream when dealing with servers that do not honor
        // Connection: Close headers.
        Psr7\Utils::copyToStream(
            $source,
            $sink,
            (\strlen($contentLength) > 0 && (int) $contentLength > 0) ? (int) $contentLength : -1
        );

        $sink->seek(0);
        $source->close();

        return $sink;
    }

    /**
     * Create a resource and check to ensure it was created successfully
     *
     * @param callable $callback Callable that returns stream resource
     *
     * @return resource
     *
     * @throws \RuntimeException on error
     */
    private function createResource(callable $callback)
    {
        $errors = [];
        \set_error_handler(static function ($_, $msg, $file, $line) use (&$errors): bool {
            $errors[] = [
                'message' => $msg,
                'file' => $file,
                'line' => $line,
            ];

            return true;
        });

        try {
            $resource = $callback();
        } finally {
            \restore_error_handler();
        }

        if (!$resource) {
            $message = 'Error creating resource: ';
            foreach ($errors as $err) {
                foreach ($err as $key => $value) {
                    $message .= "[$key] $value".\PHP_EOL;
                }
            }
            throw new \RuntimeException(\trim($message));
        }

        return $resource;
    }

    /**
     * @return resource
     */
    private function createStream(RequestInterface $request, array $options)
    {
        static $methods;
        if (!$methods) {
            $methods = \array_flip(\get_class_methods(__CLASS__));
        }

        if (!\in_array($request->getUri()->getScheme(), ['http', 'https'])) {
            throw new RequestException(\sprintf("The scheme '%s' is not supported.", $request->getUri()->getScheme()), $request);
        }

        // HTTP/1.1 streams using the PHP stream wrapper require a
        // Connection: close header
        if ($request->getProtocolVersion() == '1.1'
            && !$request->hasHeader('Connection')
        ) {
            $request = $request->withHeader('Connection', 'close');
        }

        // Ensure SSL is verified by default
        if (!isset($options['verify'])) {
            $options['verify'] = true;
        }

        $params = [];
        $context = $this->getDefaultContext($request);

        if (isset($options['on_headers']) && !\is_callable($options['on_headers'])) {
            throw new \InvalidArgumentException('on_headers must be callable');
        }

        if (!empty($options)) {
            foreach ($options as $key => $value) {
                $method = "add_{$key}";
                if (isset($methods[$method])) {
                    $this->{$method}($request, $context, $value, $params);
                }
            }
        }

        if (isset($options['stream_context'])) {
            if (!\is_array($options['stream_context'])) {
                throw new \InvalidArgumentException('stream_context must be an array');
            }
            $context = \array_replace_recursive($context, $options['stream_context']);
        }

        // Microsoft NTLM authentication only supported with curl handler
        if (isset($options['auth'][2]) && 'ntlm' === $options['auth'][2]) {
            throw new \InvalidArgumentException('Microsoft NTLM authentication only supported with curl handler');
        }

        $uri = $this->resolveHost($request, $options);

        $contextResource = $this->createResource(
            static function () use ($context, $params) {
                return \stream_context_create($context, $params);
            }
        );

        return $this->createResource(
            function () use ($uri, &$http_response_header, $contextResource, $context, $options, $request) {
                $resource = @\fopen((string) $uri, 'r', false, $contextResource);
                $this->lastHeaders = $http_response_header ?? [];

                if (false === $resource) {
                    throw new ConnectException(sprintf('Connection refused for URI %s', $uri), $request, null, $context);
                }

                if (isset($options['read_timeout'])) {
                    $readTimeout = $options['read_timeout'];
                    $sec = (int) $readTimeout;
                    $usec = ($readTimeout - $sec) * 100000;
                    \stream_set_timeout($resource, $sec, $usec);
                }

                return $resource;
            }
        );
    }

    private function resolveHost(RequestInterface $request, array $options): UriInterface
    {
        $uri = $request->getUri();

        if (isset($options['force_ip_resolve']) && !\filter_var($uri->getHost(), \FILTER_VALIDATE_IP)) {
            if ('v4' === $options['force_ip_resolve']) {
                $records = \dns_get_record($uri->getHost(), \DNS_A);
                if (false === $records || !isset($records[0]['ip'])) {
                    throw new ConnectException(\sprintf("Could not resolve IPv4 address for host '%s'", $uri->getHost()), $request);
                }

                return $uri->withHost($records[0]['ip']);
            }
            if ('v6' === $options['force_ip_resolve']) {
                $records = \dns_get_record($uri->getHost(), \DNS_AAAA);
                if (false === $records || !isset($records[0]['ipv6'])) {
                    throw new ConnectException(\sprintf("Could not resolve IPv6 address for host '%s'", $uri->getHost()), $request);
                }

                return $uri->withHost('['.$records[0]['ipv6'].']');
            }
        }

        return $uri;
    }

    private function getDefaultContext(RequestInterface $request): array
    {
        $headers = '';
        foreach ($request->getHeaders() as $name => $value) {
            foreach ($value as $val) {
                $headers .= "$name: $val\r\n";
            }
        }

        $context = [
            'http' => [
                'method' => $request->getMethod(),
                'header' => $headers,
                'protocol_version' => $request->getProtocolVersion(),
                'ignore_errors' => true,
                'follow_location' => 0,
            ],
            'ssl' => [
                'peer_name' => $request->getUri()->getHost(),
            ],
        ];

        $body = (string) $request->getBody();

        if ('' !== $body) {
            $context['http']['content'] = $body;
            // Prevent the HTTP handler from adding a Content-Type header.
            if (!$request->hasHeader('Content-Type')) {
                $context['http']['header'] .= "Content-Type:\r\n";
            }
        }

        $context['http']['header'] = \rtrim($context['http']['header']);

        return $context;
    }

    /**
     * @param mixed $value as passed via Request transfer options.
     */
    private function add_proxy(RequestInterface $request, array &$options, $value, array &$params): void
    {
        $uri = null;

        if (!\is_array($value)) {
            $uri = $value;
        } else {
            $scheme = $request->getUri()->getScheme();
            if (isset($value[$scheme])) {
                if (!isset($value['no']) || !Utils::isHostInNoProxy($request->getUri()->getHost(), $value['no'])) {
                    $uri = $value[$scheme];
                }
            }
        }

        if (!$uri) {
            return;
        }

        $parsed = $this->parse_proxy($uri);
        $options['http']['proxy'] = $parsed['proxy'];

        if ($parsed['auth']) {
            if (!isset($options['http']['header'])) {
                $options['http']['header'] = [];
            }
            $options['http']['header'] .= "\r\nProxy-Authorization: {$parsed['auth']}";
        }
    }

    /**
     * Parses the given proxy URL to make it compatible with the format PHP's stream context expects.
     */
    private function parse_proxy(string $url): array
    {
        $parsed = \parse_url($url);

        if ($parsed !== false && isset($parsed['scheme']) && $parsed['scheme'] === 'http') {
            if (isset($parsed['host']) && isset($parsed['port'])) {
                $auth = null;
                if (isset($parsed['user']) && isset($parsed['pass'])) {
                    $auth = \base64_encode("{$parsed['user']}:{$parsed['pass']}");
                }

                return [
                    'proxy' => "tcp://{$parsed['host']}:{$parsed['port']}",
                    'auth' => $auth ? "Basic {$auth}" : null,
                ];
            }
        }

        // Return proxy as-is.
        return [
            'proxy' => $url,
            'auth' => null,
        ];
    }

    /**
     * @param mixed $value as passed via Request transfer options.
     */
    private function add_timeout(RequestInterface $request, array &$options, $value, array &$params): void
    {
        if ($value > 0) {
            $options['http']['timeout'] = $value;
        }
    }

    /**
     * @param mixed $value as passed via Request transfer options.
     */
    private function add_crypto_method(RequestInterface $request, array &$options, $value, array &$params): void
    {
        if (
            $value === \STREAM_CRYPTO_METHOD_TLSv1_0_CLIENT
            || $value === \STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT
            || $value === \STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT
            || (defined('STREAM_CRYPTO_METHOD_TLSv1_3_CLIENT') && $value === \STREAM_CRYPTO_METHOD_TLSv1_3_CLIENT)
        ) {
            $options['http']['crypto_method'] = $value;

            return;
        }

        throw new \InvalidArgumentException('Invalid crypto_method request option: unknown version provided');
    }

    /**
     * @param mixed $value as passed via Request transfer options.
     */
    private function add_verify(RequestInterface $request, array &$options, $value, array &$params): void
    {
        if ($value === false) {
            $options['ssl']['verify_peer'] = false;
            $options['ssl']['verify_peer_name'] = false;

            return;
        }

        if (\is_string($value)) {
            $options['ssl']['cafile'] = $value;
            if (!\file_exists($value)) {
                throw new \RuntimeException("SSL CA bundle not found: $value");
            }
        } elseif ($value !== true) {
            throw new \InvalidArgumentException('Invalid verify request option');
        }

        $options['ssl']['verify_peer'] = true;
        $options['ssl']['verify_peer_name'] = true;
        $options['ssl']['allow_self_signed'] = false;
    }

    /**
     * @param mixed $value as passed via Request transfer options.
     */
    private function add_cert(RequestInterface $request, array &$options, $value, array &$params): void
    {
        if (\is_array($value)) {
            $options['ssl']['passphrase'] = $value[1];
            $value = $value[0];
        }

        if (!\file_exists($value)) {
            throw new \RuntimeException("SSL certificate not found: {$value}");
        }

        $options['ssl']['local_cert'] = $value;
    }

    /**
     * @param mixed $value as passed via Request transfer options.
     */
    private function add_progress(RequestInterface $request, array &$options, $value, array &$params): void
    {
        self::addNotification(
            $params,
            static function ($code, $a, $b, $c, $transferred, $total) use ($value) {
                if ($code == \STREAM_NOTIFY_PROGRESS) {
                    // The upload progress cannot be determined. Use 0 for cURL compatibility:
                    // https://curl.se/libcurl/c/CURLOPT_PROGRESSFUNCTION.html
                    $value($total, $transferred, 0, 0);
                }
            }
        );
    }

    /**
     * @param mixed $value as passed via Request transfer options.
     */
    private function add_debug(RequestInterface $request, array &$options, $value, array &$params): void
    {
        if ($value === false) {
            return;
        }

        static $map = [
            \STREAM_NOTIFY_CONNECT => 'CONNECT',
            \STREAM_NOTIFY_AUTH_REQUIRED => 'AUTH_REQUIRED',
            \STREAM_NOTIFY_AUTH_RESULT => 'AUTH_RESULT',
            \STREAM_NOTIFY_MIME_TYPE_IS => 'MIME_TYPE_IS',
            \STREAM_NOTIFY_FILE_SIZE_IS => 'FILE_SIZE_IS',
            \STREAM_NOTIFY_REDIRECTED => 'REDIRECTED',
            \STREAM_NOTIFY_PROGRESS => 'PROGRESS',
            \STREAM_NOTIFY_FAILURE => 'FAILURE',
            \STREAM_NOTIFY_COMPLETED => 'COMPLETED',
            \STREAM_NOTIFY_RESOLVE => 'RESOLVE',
        ];
        static $args = ['severity', 'message', 'message_code', 'bytes_transferred', 'bytes_max'];

        $value = Utils::debugResource($value);
        $ident = $request->getMethod().' '.$request->getUri()->withFragment('');
        self::addNotification(
            $params,
            static function (int $code, ...$passed) use ($ident, $value, $map, $args): void {
                \fprintf($value, '<%s> [%s] ', $ident, $map[$code]);
                foreach (\array_filter($passed) as $i => $v) {
                    \fwrite($value, $args[$i].': "'.$v.'" ');
                }
                \fwrite($value, "\n");
            }
        );
    }

    private static function addNotification(array &$params, callable $notify): void
    {
        // Wrap the existing function if needed.
        if (!isset($params['notification'])) {
            $params['notification'] = $notify;
        } else {
            $params['notification'] = self::callArray([
                $params['notification'],
                $notify,
            ]);
        }
    }

    private static function callArray(array $functions): callable
    {
        return static function (...$args) use ($functions) {
            foreach ($functions as $fn) {
                $fn(...$args);
            }
        };
    }
}

• [F] CurlFactory.php
  Delete
• [F] CurlFactoryInterface.php
  Delete
• [F] CurlHandler.php
  Delete
• [F] CurlMultiHandler.php
  Delete
• [F] EasyHandle.php
  Delete
• [F] HeaderProcessor.php
  Delete
• [F] MockHandler.php
  Delete
• [F] Proxy.php
  Delete
• [F] StreamHandler.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