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<?php
declare(strict_types=1);
namespace Http\Client\Common\Plugin;
use Http\Client\Common\Plugin;
use Http\Promise\Promise;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\UriInterface;
/**
* Prepend a base path to the request URI. Useful for base API URLs like http://domain.com/api.
*
* @author Sullivan Senechal <soullivaneuh@gmail.com>
*/
final class AddPathPlugin implements Plugin
{
/**
* @var UriInterface
*/
private $uri;
public function __construct(UriInterface $uri)
{
if ('' === $uri->getPath()) {
throw new \LogicException('URI path cannot be empty');
}
if ('/' === substr($uri->getPath(), -1)) {
$uri = $uri->withPath(rtrim($uri->getPath(), '/'));
}
$this->uri = $uri;
}
/**
* Adds a prefix in the beginning of the URL's path.
*
* The prefix is not added if that prefix is already on the URL's path. This will fail on the edge
* case of the prefix being repeated, for example if `https://example.com/api/api/foo` is a valid
* URL on the server and the configured prefix is `/api`.
*
* We looked at other solutions, but they are all much more complicated, while still having edge
* cases:
* - Doing an spl_object_hash on `$first` will lead to collisions over time because over time the
* hash can collide.
* - Have the PluginClient provide a magic header to identify the request chain and only apply
* this plugin once.
*
* There are 2 reasons for the AddPathPlugin to be executed twice on the same request:
* - A plugin can restart the chain by calling `$first`, e.g. redirect
* - A plugin can call `$next` more than once, e.g. retry
*
* Depending on the scenario, the path should or should not be added. E.g. `$first` could
* be called after a redirect response from the server. The server likely already has the
* correct path.
*
* No solution fits all use cases. This implementation will work fine for the common use cases.
* If you have a specific situation where this is not the right thing, you can build a custom plugin
* that does exactly what you need.
*
* {@inheritdoc}
*/
public function handleRequest(RequestInterface $request, callable $next, callable $first): Promise
{
$prepend = $this->uri->getPath();
$path = $request->getUri()->getPath();
if (substr($path, 0, strlen($prepend)) !== $prepend) {
$request = $request->withUri($request->getUri()
->withPath($prepend.$path)
);
}
return $next($request);
}
}