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<?php

namespace Github\HttpClient;

use Http\Client\Common\HttpMethodsClient;

use Http\Client\Common\HttpMethodsClientInterface;

use Http\Client\Common\Plugin;

use Http\Client\Common\Plugin\Cache\Generator\HeaderCacheKeyGenerator;

use Http\Client\Common\PluginClientFactory;

use Http\Discovery\Psr17FactoryDiscovery;

use Http\Discovery\Psr18ClientDiscovery;

use Psr\Cache\CacheItemPoolInterface;

use Psr\Http\Client\ClientInterface;

use Psr\Http\Message\RequestFactoryInterface;

use Psr\Http\Message\StreamFactoryInterface;

/**

* A builder that builds the API client.

* This will allow you to fluently add and remove plugins.

* @author Tobias Nyholm <tobias.nyholm@gmail.com>

class Builder

{

/**

* The object that sends HTTP messages.

* @var ClientInterface

private $httpClient;

/**

* A HTTP client with all our plugins.

* @var HttpMethodsClientInterface

private $pluginClient;

/**

* @var RequestFactoryInterface

private $requestFactory;

/**

* @var StreamFactoryInterface

private $streamFactory;

/**

* True if we should create a new Plugin client at next request.

* @var bool

private $httpClientModified = true;

/**

* @var Plugin[]

private $plugins = [];

/**

* This plugin is special treated because it has to be the very last plugin.

* @var Plugin\CachePlugin|null

private $cachePlugin;

/**

* Http headers.

* @var array

private $headers = [];

/**

* @param ClientInterface|null $httpClient

* @param RequestFactoryInterface|null $requestFactory

* @param StreamFactoryInterface|null $streamFactory

public function __construct(

?ClientInterface $httpClient = null,

?RequestFactoryInterface $requestFactory = null,

?StreamFactoryInterface $streamFactory = null

) {

$this->httpClient = $httpClient ?? Psr18ClientDiscovery::find();

$this->requestFactory = $requestFactory ?? Psr17FactoryDiscovery::findRequestFactory();

$this->streamFactory = $streamFactory ?? Psr17FactoryDiscovery::findStreamFactory();

}

/**

* @return HttpMethodsClientInterface

public function getHttpClient(): HttpMethodsClientInterface

{

if ($this->httpClientModified) {

$this->httpClientModified = false;

$plugins = $this->plugins;

if ($this->cachePlugin) {

$plugins[] = $this->cachePlugin;

}

$this->pluginClient = new HttpMethodsClient(

(new PluginClientFactory())->createClient($this->httpClient, $plugins),

$this->requestFactory,

$this->streamFactory

);

}

return $this->pluginClient;

}

/**

* Add a new plugin to the end of the plugin chain.

* @param Plugin $plugin

* @return void

public function addPlugin(Plugin $plugin): void

{

$this->plugins[] = $plugin;

$this->httpClientModified = true;

}

/**

* Remove a plugin by its fully qualified class name (FQCN).

* @param string $fqcn

* @return void

public function removePlugin(string $fqcn): void

{

foreach ($this->plugins as $idx => $plugin) {

if ($plugin instanceof $fqcn) {

unset($this->plugins[$idx]);

$this->httpClientModified = true;

}

/**

* Clears used headers.

* @return void

public function clearHeaders(): void

{

$this->headers = [];

$this->removePlugin(Plugin\HeaderAppendPlugin::class);

$this->addPlugin(new Plugin\HeaderAppendPlugin($this->headers));

}

/**

* @param array $headers

* @return void

public function addHeaders(array $headers): void

{

$this->headers = array_merge($this->headers, $headers);

$this->removePlugin(Plugin\HeaderAppendPlugin::class);

$this->addPlugin(new Plugin\HeaderAppendPlugin($this->headers));

}

/**

* @param string $header

* @param string $headerValue

* @return void

public function addHeaderValue(string $header, string $headerValue): void

{

if (!isset($this->headers[$header])) {

$this->headers[$header] = $headerValue;

} else {

$this->headers[$header] = array_merge((array) $this->headers[$header], [$headerValue]);

}

$this->removePlugin(Plugin\HeaderAppendPlugin::class);

$this->addPlugin(new Plugin\HeaderAppendPlugin($this->headers));

}

/**

* Add a cache plugin to cache responses locally.

* @param CacheItemPoolInterface $cachePool

* @param array $config

* @return void

public function addCache(CacheItemPoolInterface $cachePool, array $config = []): void

{

if (!isset($config['cache_key_generator'])) {

$config['cache_key_generator'] = new HeaderCacheKeyGenerator(['Authorization', 'Cookie', 'Accept', 'Content-type']);

}

$this->cachePlugin = Plugin\CachePlugin::clientCache($cachePool, $this->streamFactory, $config);

$this->httpClientModified = true;

}

/**

* Remove the cache plugin.

* @return void

public function removeCache(): void

{

$this->cachePlugin = null;

$this->httpClientModified = true;

}

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PL/B Language Development and Support

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