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Diffstat (limited to 'vendor/guzzlehttp/guzzle/src/HandlerStack.php')
| -rw-r--r-- | vendor/guzzlehttp/guzzle/src/HandlerStack.php | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/vendor/guzzlehttp/guzzle/src/HandlerStack.php b/vendor/guzzlehttp/guzzle/src/HandlerStack.php new file mode 100644 index 0000000..6a49cc0 --- /dev/null +++ b/vendor/guzzlehttp/guzzle/src/HandlerStack.php @@ -0,0 +1,277 @@ +<?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. + */ +class HandlerStack +{ + /** @var callable|null */ + private $handler; + + /** @var array */ + private $stack = []; + + /** @var callable|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 $handler HTTP handler function to use with the stack. If no + * handler is provided, the best handler for your + * system will be utilized. + * + * @return HandlerStack + */ + public static function create(callable $handler = null) + { + $stack = new self($handler ?: choose_handler()); + $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 $handler Underlying HTTP handler. + */ + public function __construct(callable $handler = null) + { + $this->handler = $handler; + } + + /** + * Invokes the handler stack as a composed handler + * + * @param RequestInterface $request + * @param array $options + * + * @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) { + $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 $handler Accepts a request and array of options and + * returns a Promise. + */ + public function setHandler(callable $handler) + { + $this->handler = $handler; + $this->cached = null; + } + + /** + * Returns true if the builder has a handler. + * + * @return bool + */ + public function hasHandler() + { + return (bool) $this->handler; + } + + /** + * Unshift a middleware to the bottom of the stack. + * + * @param callable $middleware Middleware function + * @param string $name Name to register for this middleware. + */ + public function unshift(callable $middleware, $name = null) + { + array_unshift($this->stack, [$middleware, $name]); + $this->cached = null; + } + + /** + * Push a middleware to the top of the stack. + * + * @param callable $middleware Middleware function + * @param string $name Name to register for this middleware. + */ + public function push(callable $middleware, $name = '') + { + $this->stack[] = [$middleware, $name]; + $this->cached = null; + } + + /** + * Add a middleware before another middleware by name. + * + * @param string $findName Middleware to find + * @param callable $middleware Middleware function + * @param string $withName Name to register for this middleware. + */ + public function before($findName, callable $middleware, $withName = '') + { + $this->splice($findName, $withName, $middleware, true); + } + + /** + * Add a middleware after another middleware by name. + * + * @param string $findName Middleware to find + * @param callable $middleware Middleware function + * @param string $withName Name to register for this middleware. + */ + public function after($findName, callable $middleware, $withName = '') + { + $this->splice($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) + { + $this->cached = null; + $idx = is_callable($remove) ? 0 : 1; + $this->stack = array_values(array_filter( + $this->stack, + function ($tuple) use ($idx, $remove) { + return $tuple[$idx] !== $remove; + } + )); + } + + /** + * Compose the middleware and handler into a single callable function. + * + * @return callable + */ + public function resolve() + { + if (!$this->cached) { + if (!($prev = $this->handler)) { + throw new \LogicException('No handler has been specified'); + } + + foreach (array_reverse($this->stack) as $fn) { + $prev = $fn[0]($prev); + } + + $this->cached = $prev; + } + + return $this->cached; + } + + /** + * @param string $name + * @return int + */ + private function findByName($name) + { + 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. + * + * @param string $findName + * @param string $withName + * @param callable $middleware + * @param bool $before + */ + private function splice($findName, $withName, callable $middleware, $before) + { + $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 array|callable $fn Function to write as a string. + * + * @return string + */ + private function debugCallable($fn) + { + 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]}'])"; + } + + return 'callable(' . spl_object_hash($fn) . ')'; + } +} |