<?php
namespace GuzzleHttp;
use GuzzleHttp\Promise\PromiseInterface;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
/**
* Creates a composed Guzzle handler function by stacking middlewares on top of
* an HTTP handler function.
*
* @final
*/
class HandlerStack
{
/**
* @var (callable(RequestInterface, array): PromiseInterface)|null
*/
private $handler;
/**
* @var array{(callable(callable(RequestInterface, array): PromiseInterface): callable), (string|null)}[]
*/
private $stack = [];
/**
* @var (callable(RequestInterface, array): PromiseInterface)|null
*/
private $cached;
/**
* Creates a default handler stack that can be used by clients.
*
* The returned handler will wrap the provided handler or use the most
* appropriate default handler for your system. The returned HandlerStack has
* support for cookies, redirects, HTTP error exceptions, and preparing a body
* before sending.
*
* The returned handler stack can be passed to a client in the "handler"
* option.
*
* @param (callable(RequestInterface, array): PromiseInterface)|null $handler HTTP handler function to use with the stack. If no
* handler is provided, the best handler for your
* system will be utilized.
*/
public static function create(callable $handler = null): self
{
$stack = new self($handler ?: Utils::chooseHandler());
$stack->push(Middleware::httpErrors(), 'http_errors');
$stack->push(Middleware::redirect(), 'allow_redirects');
$stack->push(Middleware::cookies(), 'cookies');
$stack->push(Middleware::prepareBody(), 'prepare_body');
return $stack;
}
/**
* @param (callable(RequestInterface, array): PromiseInterface)|null $handler Underlying HTTP handler.
*/
public function __construct(callable $handler = null)
{
$this->handler = $handler;
}
/**
* Invokes the handler stack as a composed handler
*
* @return ResponseInterface|PromiseInterface
*/
public function __invoke(RequestInterface $request, array $options)
{
$handler = $this->resolve();
return $handler($request, $options);
}
/**
* Dumps a string representation of the stack.
*
* @return string
*/
public function __toString()
{
$depth = 0;
$stack = [];
if ($this->handler !== null) {
$stack[] = '0) Handler: '.$this->debugCallable($this->handler);
}
$result = '';
foreach (\array_reverse($this->stack) as $tuple) {
++$depth;
$str = "{$depth}) Name: '{$tuple[1]}', ";
$str .= 'Function: '.$this->debugCallable($tuple[0]);
$result = "> {$str}\n{$result}";
$stack[] = $str;
}
foreach (\array_keys($stack) as $k) {
$result .= "< {$stack[$k]}\n";
}
return $result;
}
/**
* Set the HTTP handler that actually returns a promise.
*
* @param callable(RequestInterface, array): PromiseInterface $handler Accepts a request and array of options and
* returns a Promise.
*/
public function setHandler(callable $handler): void
{
$this->handler = $handler;
$this->cached = null;
}
/**
* Returns true if the builder has a handler.
*/
public function hasHandler(): bool
{
return $this->handler !== null;
}
/**
* Unshift a middleware to the bottom of the stack.
*
* @param callable(callable): callable $middleware Middleware function
* @param string $name Name to register for this middleware.
*/
public function unshift(callable $middleware, string $name = null): void
{
\array_unshift($this->stack, [$middleware, $name]);
$this->cached = null;
}
/**
* Push a middleware to the top of the stack.
*
* @param callable(callable): callable $middleware Middleware function
* @param string $name Name to register for this middleware.
*/
public function push(callable $middleware, string $name = ''): void
{
$this->stack[] = [$middleware, $name];
$this->cached = null;
}
/**
* Add a middleware before another middleware by name.
*
* @param string $findName Middleware to find
* @param callable(callable): callable $middleware Middleware function
* @param string $withName Name to register for this middleware.
*/
public function before(string $findName, callable $middleware, string $withName = ''): void
{
$this->splice($findName, $withName, $middleware, true);
}
/**
* Add a middleware after another middleware by name.
*
* @param string $findName Middleware to find
* @param callable(callable): callable $middleware Middleware function
* @param string $withName Name to register for this middleware.
*/
public function after(string $findName, callable $middleware, string $withName = ''): void
{
$this->splice($findName, $withName, $middleware, false);
}
/**
* Remove a middleware by instance or name from the stack.
*
* @param callable|string $remove Middleware to remove by instance or name.
*/
public function remove($remove): void
{
if (!is_string($remove) && !is_callable($remove)) {
trigger_deprecation('guzzlehttp/guzzle', '7.4', 'Not passing a callable or string to %s::%s() is deprecated and will cause an error in 8.0.', __CLASS__, __FUNCTION__);
}
$this->cached = null;
$idx = \is_callable($remove) ? 0 : 1;
$this->stack = \array_values(\array_filter(
$this->stack,
static function ($tuple) use ($idx, $remove) {
return $tuple[$idx] !== $remove;
}
));
}
/**
* Compose the middleware and handler into a single callable function.
*
* @return callable(RequestInterface, array): PromiseInterface
*/
public function resolve(): callable
{
if ($this->cached === null) {
if (($prev = $this->handler) === null) {
throw new \LogicException('No handler has been specified');
}
foreach (\array_reverse($this->stack) as $fn) {
/** @var callable(RequestInterface, array): PromiseInterface $prev */
$prev = $fn[0]($prev);
}
$this->cached = $prev;
}
return $this->cached;
}
private function findByName(string $name): int
{
foreach ($this->stack as $k => $v) {
if ($v[1] === $name) {
return $k;
}
}
throw new \InvalidArgumentException("Middleware not found: $name");
}
/**
* Splices a function into the middleware list at a specific position.
*/
private function splice(string $findName, string $withName, callable $middleware, bool $before): void
{
$this->cached = null;
$idx = $this->findByName($findName);
$tuple = [$middleware, $withName];
if ($before) {
if ($idx === 0) {
\array_unshift($this->stack, $tuple);
} else {
$replacement = [$tuple, $this->stack[$idx]];
\array_splice($this->stack, $idx, 1, $replacement);
}
} elseif ($idx === \count($this->stack) - 1) {
$this->stack[] = $tuple;
} else {
$replacement = [$this->stack[$idx], $tuple];
\array_splice($this->stack, $idx, 1, $replacement);
}
}
/**
* Provides a debug string for a given callable.
*
* @param callable|string $fn Function to write as a string.
*/
private function debugCallable($fn): string
{
if (\is_string($fn)) {
return "callable({$fn})";
}
if (\is_array($fn)) {
return \is_string($fn[0])
? "callable({$fn[0]}::{$fn[1]})"
: "callable(['".\get_class($fn[0])."', '{$fn[1]}'])";
}
/** @var object $fn */
return 'callable('.\spl_object_hash($fn).')';
}
}
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How it Works
Quick Steps to NFC Pay
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SMS or Email Verification
Receive instant alerts for every transaction to keep track of your account activities.
KYC Solution
Verify your identity through our Know Your Customer process to prevent fraud and enhance security.
Two Factor Authentication
Dramatically supply transparent backward deliverables before caward comp internal or "organic" sources.
End-to-End Encryption
All your data and transactions are encrypted, ensuring that your sensitive information remains private.
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Why Choice Us
Top Reasons to Choose Us for Reliable and Expert Solutions
With NFC Pay, you get a trusted platform backed by proven expertise and a commitment to quality. We put our customers first, offering innovative solutions tailored to your needs, ensuring every transaction is secure, swift, and seamless.
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Testimonial Section
Customer Feedback: Real Experiences from Satisfied Clients and Partners
Hear from our users who trust NFC Pay for their everyday transactions. Our commitment to security, ease of use, and exceptional service shines through in their experiences. See why our clients choose NFC Pay for their payment needs and how it has transformed the way they manage their finances.
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Get the NFC Pay App for Seamless Transactions Anytime, Anywhere
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In the digital age, privacy concerns have become increasingly paramount, prompting the European Union to enact the General Data Protection Regulation (GDPR) in 2018. Among its many provisions, GDPR sets strict guidelines for the collection and processing of personal data, including the use of cookies on websites. Privacy Policy
