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<?php
namespace GuzzleHttp;

use GuzzleHttp\Cookie\CookieJar;
use GuzzleHttp\Promise;
use GuzzleHttp\Psr7;
use Psr\Http\Message\UriInterface;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;

/**
 * @method ResponseInterface get(string|UriInterface $uri, array $options = [])
 * @method ResponseInterface head(string|UriInterface $uri, array $options = [])
 * @method ResponseInterface put(string|UriInterface $uri, array $options = [])
 * @method ResponseInterface post(string|UriInterface $uri, array $options = [])
 * @method ResponseInterface patch(string|UriInterface $uri, array $options = [])
 * @method ResponseInterface delete(string|UriInterface $uri, array $options = [])
 * @method Promise\PromiseInterface getAsync(string|UriInterface $uri, array $options = [])
 * @method Promise\PromiseInterface headAsync(string|UriInterface $uri, array $options = [])
 * @method Promise\PromiseInterface putAsync(string|UriInterface $uri, array $options = [])
 * @method Promise\PromiseInterface postAsync(string|UriInterface $uri, array $options = [])
 * @method Promise\PromiseInterface patchAsync(string|UriInterface $uri, array $options = [])
 * @method Promise\PromiseInterface deleteAsync(string|UriInterface $uri, array $options = [])
 */
class Client implements ClientInterface
{
    /** @var array Default request options */
    private $config;

/**
     * Clients accept an array of constructor parameters.
     *
     * Here's an example of creating a client using a base_uri and an array of
     * default request options to apply to each request:
     *
     *     $client = new Client([
     *         'base_uri'        => 'http://www.foo.com/1.0/',
     *         'timeout'         => 0,
     *         'allow_redirects' => false,
     *         'proxy'           => '192.168.16.1:10'
     *     ]);
     *
     * Client configuration settings include the following options:
     *
     * - handler: (callable) Function that transfers HTTP requests over the
     *   wire. The function is called with a Psr7\Http\Message\RequestInterface
     *   and array of transfer options, and must return a
     *   GuzzleHttp\Promise\PromiseInterface that is fulfilled with a
     *   Psr7\Http\Message\ResponseInterface on success. "handler" is a
     *   constructor only option that cannot be overridden in per/request
     *   options. If no handler is provided, a default handler will be created
     *   that enables all of the request options below by attaching all of the
     *   default middleware to the handler.
     * - base_uri: (string|UriInterface) Base URI of the client that is merged
     *   into relative URIs. Can be a string or instance of UriInterface.
     * - **: any request option
     *
     * @param array $config Client configuration settings.
     *
     * @see \GuzzleHttp\RequestOptions for a list of available request options.
     */
    public function __construct(array $config = [])
    {
        if (!isset($config['handler'])) {
            $config['handler'] = HandlerStack::create();
        } elseif (!is_callable($config['handler'])) {
            throw new \InvalidArgumentException('handler must be a callable');
        }

// Convert the base_uri to a UriInterface
        if (isset($config['base_uri'])) {
            $config['base_uri'] = Psr7\uri_for($config['base_uri']);
        }

$this->configureDefaults($config);
    }

public function __call($method, $args)
    {
        if (count($args) < 1) {
            throw new \InvalidArgumentException('Magic request methods require a URI and optional options array');
        }

$uri = $args[0];
        $opts = isset($args[1]) ? $args[1] : [];

return substr($method, -5) === 'Async'
            ? $this->requestAsync(substr($method, 0, -5), $uri, $opts)
            : $this->request($method, $uri, $opts);
    }

public function sendAsync(RequestInterface $request, array $options = [])
    {
        // Merge the base URI into the request URI if needed.
        $options = $this->prepareDefaults($options);

return $this->transfer(
            $request->withUri($this->buildUri($request->getUri(), $options), $request->hasHeader('Host')),
            $options
        );
    }

public function send(RequestInterface $request, array $options = [])
    {
        $options[RequestOptions::SYNCHRONOUS] = true;
        return $this->sendAsync($request, $options)->wait();
    }

public function requestAsync($method, $uri = '', array $options = [])
    {
        $options = $this->prepareDefaults($options);
        // Remove request modifying parameter because it can be done up-front.
        $headers = isset($options['headers']) ? $options['headers'] : [];
        $body = isset($options['body']) ? $options['body'] : null;
        $version = isset($options['version']) ? $options['version'] : '1.1';
        // Merge the URI into the base URI.
        $uri = $this->buildUri($uri, $options);
        if (is_array($body)) {
            $this->invalidBody();
        }
        $request = new Psr7\Request($method, $uri, $headers, $body, $version);
        // Remove the option so that they are not doubly-applied.
        unset($options['headers'], $options['body'], $options['version']);

return $this->transfer($request, $options);
    }

public function request($method, $uri = '', array $options = [])
    {
        $options[RequestOptions::SYNCHRONOUS] = true;
        return $this->requestAsync($method, $uri, $options)->wait();
    }

public function getConfig($option = null)
    {
        return $option === null
            ? $this->config
            : (isset($this->config[$option]) ? $this->config[$option] : null);
    }

private function buildUri($uri, array $config)
    {
        // for BC we accept null which would otherwise fail in uri_for
        $uri = Psr7\uri_for($uri === null ? '' : $uri);

if (isset($config['base_uri'])) {
            $uri = Psr7\UriResolver::resolve(Psr7\uri_for($config['base_uri']), $uri);
        }

return $uri->getScheme() === '' && $uri->getHost() !== '' ? $uri->withScheme('http') : $uri;
    }

/**
     * Configures the default options for a client.
     *
     * @param array $config
     */
    private function configureDefaults(array $config)
    {
        $defaults = [
            'allow_redirects' => RedirectMiddleware::$defaultSettings,
            'http_errors'     => true,
            'decode_content'  => true,
            'verify'          => true,
            'cookies'         => false
        ];

// Use the standard Linux HTTP_PROXY and HTTPS_PROXY if set.

// We can only trust the HTTP_PROXY environment variable in a CLI
        // process due to the fact that PHP has no reliable mechanism to
        // get environment variables that start with "HTTP_".
        if (php_sapi_name() == 'cli' && getenv('HTTP_PROXY')) {
            $defaults['proxy']['http'] = getenv('HTTP_PROXY');
        }

if ($proxy = getenv('HTTPS_PROXY')) {
            $defaults['proxy']['https'] = $proxy;
        }

if ($noProxy = getenv('NO_PROXY')) {
            $cleanedNoProxy = str_replace(' ', '', $noProxy);
            $defaults['proxy']['no'] = explode(',', $cleanedNoProxy);
        }

$this->config = $config + $defaults;

if (!empty($config['cookies']) && $config['cookies'] === true) {
            $this->config['cookies'] = new CookieJar();
        }

// Add the default user-agent header.
        if (!isset($this->config['headers'])) {
            $this->config['headers'] = ['User-Agent' => default_user_agent()];
        } else {
            // Add the User-Agent header if one was not already set.
            foreach (array_keys($this->config['headers']) as $name) {
                if (strtolower($name) === 'user-agent') {
                    return;
                }
            }
            $this->config['headers']['User-Agent'] = default_user_agent();
        }
    }

/**
     * Merges default options into the array.
     *
     * @param array $options Options to modify by reference
     *
     * @return array
     */
    private function prepareDefaults($options)
    {
        $defaults = $this->config;

if (!empty($defaults['headers'])) {
            // Default headers are only added if they are not present.
            $defaults['_conditional'] = $defaults['headers'];
            unset($defaults['headers']);
        }

// Special handling for headers is required as they are added as
        // conditional headers and as headers passed to a request ctor.
        if (array_key_exists('headers', $options)) {
            // Allows default headers to be unset.
            if ($options['headers'] === null) {
                $defaults['_conditional'] = null;
                unset($options['headers']);
            } elseif (!is_array($options['headers'])) {
                throw new \InvalidArgumentException('headers must be an array');
            }
        }

// Shallow merge defaults underneath options.
        $result = $options + $defaults;

// Remove null values.
        foreach ($result as $k => $v) {
            if ($v === null) {
                unset($result[$k]);
            }
        }

return $result;
    }

/**
     * Transfers the given request and applies request options.
     *
     * The URI of the request is not modified and the request options are used
     * as-is without merging in default options.
     *
     * @param RequestInterface $request
     * @param array            $options
     *
     * @return Promise\PromiseInterface
     */
    private function transfer(RequestInterface $request, array $options)
    {
        // save_to -> sink
        if (isset($options['save_to'])) {
            $options['sink'] = $options['save_to'];
            unset($options['save_to']);
        }

// exceptions -> http_errors
        if (isset($options['exceptions'])) {
            $options['http_errors'] = $options['exceptions'];
            unset($options['exceptions']);
        }

$request = $this->applyOptions($request, $options);
        $handler = $options['handler'];

try {
            return Promise\promise_for($handler($request, $options));
        } catch (\Exception $e) {
            return Promise\rejection_for($e);
        }
    }

/**
     * Applies the array of request options to a request.
     *
     * @param RequestInterface $request
     * @param array            $options
     *
     * @return RequestInterface
     */
    private function applyOptions(RequestInterface $request, array &$options)
    {
        $modify = [];

if (isset($options['form_params'])) {
            if (isset($options['multipart'])) {
                throw new \InvalidArgumentException('You cannot use '
                    . 'form_params and multipart at the same time. Use the '
                    . 'form_params option if you want to send application/'
                    . 'x-www-form-urlencoded requests, and the multipart '
                    . 'option to send multipart/form-data requests.');
            }
            $options['body'] = http_build_query($options['form_params'], '', '&');
            unset($options['form_params']);
            $options['_conditional']['Content-Type'] = 'application/x-www-form-urlencoded';
        }

if (isset($options['multipart'])) {
            $options['body'] = new Psr7\MultipartStream($options['multipart']);
            unset($options['multipart']);
        }

if (isset($options['json'])) {
            $options['body'] = \GuzzleHttp\json_encode($options['json']);
            unset($options['json']);
            $options['_conditional']['Content-Type'] = 'application/json';
        }

if (!empty($options['decode_content'])
            && $options['decode_content'] !== true
        ) {
            $modify['set_headers']['Accept-Encoding'] = $options['decode_content'];
        }

if (isset($options['headers'])) {
            if (isset($modify['set_headers'])) {
                $modify['set_headers'] = $options['headers'] + $modify['set_headers'];
            } else {
                $modify['set_headers'] = $options['headers'];
            }
            unset($options['headers']);
        }

if (isset($options['body'])) {
            if (is_array($options['body'])) {
                $this->invalidBody();
            }
            $modify['body'] = Psr7\stream_for($options['body']);
            unset($options['body']);
        }

if (!empty($options['auth']) && is_array($options['auth'])) {
            $value = $options['auth'];
            $type = isset($value[2]) ? strtolower($value[2]) : 'basic';
            switch ($type) {
                case 'basic':
                    $modify['set_headers']['Authorization'] = 'Basic '
                        . base64_encode("$value[0]:$value[1]");
                    break;
                case 'digest':
                    // @todo: Do not rely on curl
                    $options['curl'][CURLOPT_HTTPAUTH] = CURLAUTH_DIGEST;
                    $options['curl'][CURLOPT_USERPWD] = "$value[0]:$value[1]";
                    break;
                case 'ntlm':
                    $options['curl'][CURLOPT_HTTPAUTH] = CURLAUTH_NTLM;
                    $options['curl'][CURLOPT_USERPWD] = "$value[0]:$value[1]";
                    break;
            }
        }

if (isset($options['query'])) {
            $value = $options['query'];
            if (is_array($value)) {
                $value = http_build_query($value, null, '&', PHP_QUERY_RFC3986);
            }
            if (!is_string($value)) {
                throw new \InvalidArgumentException('query must be a string or array');
            }
            $modify['query'] = $value;
            unset($options['query']);
        }

// Ensure that sink is not an invalid value.
        if (isset($options['sink'])) {
            // TODO: Add more sink validation?
            if (is_bool($options['sink'])) {
                throw new \InvalidArgumentException('sink must not be a boolean');
            }
        }

$request = Psr7\modify_request($request, $modify);
        if ($request->getBody() instanceof Psr7\MultipartStream) {
            // Use a multipart/form-data POST if a Content-Type is not set.
            $options['_conditional']['Content-Type'] = 'multipart/form-data; boundary='
                . $request->getBody()->getBoundary();
        }

// Merge in conditional headers if they are not present.
        if (isset($options['_conditional'])) {
            // Build up the changes so it's in a single clone of the message.
            $modify = [];
            foreach ($options['_conditional'] as $k => $v) {
                if (!$request->hasHeader($k)) {
                    $modify['set_headers'][$k] = $v;
                }
            }
            $request = Psr7\modify_request($request, $modify);
            // Don't pass this internal value along to middleware/handlers.
            unset($options['_conditional']);
        }

return $request;
    }

private function invalidBody()
    {
        throw new \InvalidArgumentException('Passing in the "body" request '
            . 'option as an array to send a POST request has been deprecated. '
            . 'Please use the "form_params" request option to send a '
            . 'application/x-www-form-urlencoded request, or the "multipart" '
            . 'request option to send a multipart/form-data request.');
    }
}