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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\BrowserKit;

use Symfony\Component\BrowserKit\Exception\BadMethodCallException;
use Symfony\Component\DomCrawler\Crawler;
use Symfony\Component\DomCrawler\Form;
use Symfony\Component\DomCrawler\Link;
use Symfony\Component\Process\PhpProcess;

/**
 * Client simulates a browser.
 *
 * To make the actual request, you need to implement the doRequest() method.
 *
 * If you want to be able to run requests in their own process (insulated flag),
 * you need to also implement the getScript() method.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 *
 * @deprecated since Symfony 4.3, use "\Symfony\Component\BrowserKit\AbstractBrowser" instead
 */
abstract class Client
{
    protected $history;
    protected $cookieJar;
    protected $server = [];
    protected $internalRequest;
    protected $request;
    protected $internalResponse;
    protected $response;
    protected $crawler;
    protected $insulated = false;
    protected $redirect;
    protected $followRedirects = true;
    protected $followMetaRefresh = false;

    private $maxRedirects = -1;
    private $redirectCount = 0;
    private $redirects = [];
    private $isMainRequest = true;

    /**
     * @param array     $server    The server parameters (equivalent of $_SERVER)
     * @param History   $history   A History instance to store the browser history
     * @param CookieJar $cookieJar A CookieJar instance to store the cookies
     */
    public function __construct(array $server = [], History $history = null, CookieJar $cookieJar = null)
    {
        $this->setServerParameters($server);
        $this->history = $history ?: new History();
        $this->cookieJar = $cookieJar ?: new CookieJar();
    }

    /**
     * Sets whether to automatically follow redirects or not.
     *
     * @param bool $followRedirect Whether to follow redirects
     */
    public function followRedirects($followRedirect = true)
    {
        $this->followRedirects = (bool) $followRedirect;
    }

    /**
     * Sets whether to automatically follow meta refresh redirects or not.
     */
    public function followMetaRefresh(bool $followMetaRefresh = true)
    {
        $this->followMetaRefresh = $followMetaRefresh;
    }

    /**
     * Returns whether client automatically follows redirects or not.
     *
     * @return bool
     */
    public function isFollowingRedirects()
    {
        return $this->followRedirects;
    }

    /**
     * Sets the maximum number of redirects that crawler can follow.
     *
     * @param int $maxRedirects
     */
    public function setMaxRedirects($maxRedirects)
    {
        $this->maxRedirects = $maxRedirects < 0 ? -1 : $maxRedirects;
        $this->followRedirects = -1 != $this->maxRedirects;
    }

    /**
     * Returns the maximum number of redirects that crawler can follow.
     *
     * @return int
     */
    public function getMaxRedirects()
    {
        return $this->maxRedirects;
    }

    /**
     * Sets the insulated flag.
     *
     * @param bool $insulated Whether to insulate the requests or not
     *
     * @throws \RuntimeException When Symfony Process Component is not installed
     */
    public function insulate($insulated = true)
    {
        if ($insulated && !class_exists('Symfony\\Component\\Process\\Process')) {
            throw new \LogicException('Unable to isolate requests as the Symfony Process Component is not installed.');
        }

        $this->insulated = (bool) $insulated;
    }

    /**
     * Sets server parameters.
     *
     * @param array $server An array of server parameters
     */
    public function setServerParameters(array $server)
    {
        $this->server = array_merge([
            'HTTP_USER_AGENT' => 'Symfony BrowserKit',
        ], $server);
    }

    /**
     * Sets single server parameter.
     *
     * @param string $key   A key of the parameter
     * @param string $value A value of the parameter
     */
    public function setServerParameter($key, $value)
    {
        $this->server[$key] = $value;
    }

    /**
     * Gets single server parameter for specified key.
     *
     * @param string $key     A key of the parameter to get
     * @param string $default A default value when key is undefined
     *
     * @return string A value of the parameter
     */
    public function getServerParameter($key, $default = '')
    {
        return isset($this->server[$key]) ? $this->server[$key] : $default;
    }

    public function xmlHttpRequest(string $method, string $uri, array $parameters = [], array $files = [], array $server = [], string $content = null, bool $changeHistory = true): Crawler
    {
        $this->setServerParameter('HTTP_X_REQUESTED_WITH', 'XMLHttpRequest');

        try {
            return $this->request($method, $uri, $parameters, $files, $server, $content, $changeHistory);
        } finally {
            unset($this->server['HTTP_X_REQUESTED_WITH']);
        }
    }

    /**
     * Returns the History instance.
     *
     * @return History A History instance
     */
    public function getHistory()
    {
        return $this->history;
    }

    /**
     * Returns the CookieJar instance.
     *
     * @return CookieJar A CookieJar instance
     */
    public function getCookieJar()
    {
        return $this->cookieJar;
    }

    /**
     * Returns the current Crawler instance.
     *
     * @return Crawler A Crawler instance
     */
    public function getCrawler()
    {
        if (null === $this->crawler) {
            @trigger_error(sprintf('Calling the "%s()" method before the "request()" one is deprecated since Symfony 4.1 and will throw an exception in 5.0.', \get_class($this).'::'.__FUNCTION__), E_USER_DEPRECATED);
            // throw new BadMethodCallException(sprintf('The "request()" method must be called before "%s()".', __METHOD__));
        }

        return $this->crawler;
    }

    /**
     * Returns the current BrowserKit Response instance.
     *
     * @return Response A BrowserKit Response instance
     */
    public function getInternalResponse()
    {
        if (null === $this->internalResponse) {
            @trigger_error(sprintf('Calling the "%s()" method before the "request()" one is deprecated since Symfony 4.1 and will throw an exception in 5.0.', \get_class($this).'::'.__FUNCTION__), E_USER_DEPRECATED);
            // throw new BadMethodCallException(sprintf('The "request()" method must be called before "%s()".', __METHOD__));
        }

        return $this->internalResponse;
    }

    /**
     * Returns the current origin response instance.
     *
     * The origin response is the response instance that is returned
     * by the code that handles requests.
     *
     * @return object A response instance
     *
     * @see doRequest()
     */
    public function getResponse()
    {
        if (null === $this->response) {
            @trigger_error(sprintf('Calling the "%s()" method before the "request()" one is deprecated since Symfony 4.1 and will throw an exception in 5.0.', \get_class($this).'::'.__FUNCTION__), E_USER_DEPRECATED);
            // throw new BadMethodCallException(sprintf('The "request()" method must be called before "%s()".', __METHOD__));
        }

        return $this->response;
    }

    /**
     * Returns the current BrowserKit Request instance.
     *
     * @return Request A BrowserKit Request instance
     */
    public function getInternalRequest()
    {
        if (null === $this->internalRequest) {
            @trigger_error(sprintf('Calling the "%s()" method before the "request()" one is deprecated since Symfony 4.1 and will throw an exception in 5.0.', \get_class($this).'::'.__FUNCTION__), E_USER_DEPRECATED);
            // throw new BadMethodCallException(sprintf('The "request()" method must be called before "%s()".', __METHOD__));
        }

        return $this->internalRequest;
    }

    /**
     * Returns the current origin Request instance.
     *
     * The origin request is the request instance that is sent
     * to the code that handles requests.
     *
     * @return object A Request instance
     *
     * @see doRequest()
     */
    public function getRequest()
    {
        if (null === $this->request) {
            @trigger_error(sprintf('Calling the "%s()" method before the "request()" one is deprecated since Symfony 4.1 and will throw an exception in 5.0.', \get_class($this).'::'.__FUNCTION__), E_USER_DEPRECATED);
            // throw new BadMethodCallException(sprintf('The "request()" method must be called before "%s()".', __METHOD__));
        }

        return $this->request;
    }

    /**
     * Clicks on a given link.
     *
     * @return Crawler
     */
    public function click(Link $link)
    {
        if ($link instanceof Form) {
            return $this->submit($link);
        }

        return $this->request($link->getMethod(), $link->getUri());
    }

    /**
     * Clicks the first link (or clickable image) that contains the given text.
     *
     * @param string $linkText The text of the link or the alt attribute of the clickable image
     */
    public function clickLink(string $linkText): Crawler
    {
        if (null === $this->crawler) {
            throw new BadMethodCallException(sprintf('The "request()" method must be called before "%s()".', __METHOD__));
        }

        return $this->click($this->crawler->selectLink($linkText)->link());
    }

    /**
     * Submits a form.
     *
     * @param Form  $form             A Form instance
     * @param array $values           An array of form field values
     * @param array $serverParameters An array of server parameters
     *
     * @return Crawler
     */
    public function submit(Form $form, array $values = []/*, array $serverParameters = []*/)
    {
        if (\func_num_args() < 3 && __CLASS__ !== \get_class($this) && __CLASS__ !== (new \ReflectionMethod($this, __FUNCTION__))->getDeclaringClass()->getName() && !$this instanceof \PHPUnit\Framework\MockObject\MockObject && !$this instanceof \Prophecy\Prophecy\ProphecySubjectInterface) {
            @trigger_error(sprintf('The "%s()" method will have a new "array $serverParameters = []" argument in version 5.0, not defining it is deprecated since Symfony 4.2.', \get_class($this).'::'.__FUNCTION__), E_USER_DEPRECATED);
        }

        $form->setValues($values);
        $serverParameters = 2 < \func_num_args() ? func_get_arg(2) : [];

        return $this->request($form->getMethod(), $form->getUri(), $form->getPhpValues(), $form->getPhpFiles(), $serverParameters);
    }

    /**
     * Finds the first form that contains a button with the given content and
     * uses it to submit the given form field values.
     *
     * @param string $button           The text content, id, value or name of the form <button> or <input type="submit">
     * @param array  $fieldValues      Use this syntax: ['my_form[name]' => '...', 'my_form[email]' => '...']
     * @param string $method           The HTTP method used to submit the form
     * @param array  $serverParameters These values override the ones stored in $_SERVER (HTTP headers must include a HTTP_ prefix as PHP does)
     */
    public function submitForm(string $button, array $fieldValues = [], string $method = 'POST', array $serverParameters = []): Crawler
    {
        if (null === $this->crawler) {
            throw new BadMethodCallException(sprintf('The "request()" method must be called before "%s()".', __METHOD__));
        }

        $buttonNode = $this->crawler->selectButton($button);
        $form = $buttonNode->form($fieldValues, $method);

        return $this->submit($form, [], $serverParameters);
    }

    /**
     * Calls a URI.
     *
     * @param string $method        The request method
     * @param string $uri           The URI to fetch
     * @param array  $parameters    The Request parameters
     * @param array  $files         The files
     * @param array  $server        The server parameters (HTTP headers are referenced with a HTTP_ prefix as PHP does)
     * @param string $content       The raw body data
     * @param bool   $changeHistory Whether to update the history or not (only used internally for back(), forward(), and reload())
     *
     * @return Crawler
     */
    public function request(string $method, string $uri, array $parameters = [], array $files = [], array $server = [], string $content = null, bool $changeHistory = true)
    {
        if ($this->isMainRequest) {
            $this->redirectCount = 0;
        } else {
            ++$this->redirectCount;
        }

        $originalUri = $uri;

        $uri = $this->getAbsoluteUri($uri);

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

        if (!empty($server['HTTP_HOST']) && null === parse_url($originalUri, PHP_URL_HOST)) {
            $uri = preg_replace('{^(https?\://)'.preg_quote($this->extractHost($uri)).'}', '${1}'.$server['HTTP_HOST'], $uri);
        }

        if (isset($server['HTTPS']) && null === parse_url($originalUri, PHP_URL_SCHEME)) {
            $uri = preg_replace('{^'.parse_url($uri, PHP_URL_SCHEME).'}', $server['HTTPS'] ? 'https' : 'http', $uri);
        }

        if (!$this->history->isEmpty()) {
            $server['HTTP_REFERER'] = $this->history->current()->getUri();
        }

        if (empty($server['HTTP_HOST'])) {
            $server['HTTP_HOST'] = $this->extractHost($uri);
        }

        $server['HTTPS'] = 'https' == parse_url($uri, PHP_URL_SCHEME);

        $this->internalRequest = new Request($uri, $method, $parameters, $files, $this->cookieJar->allValues($uri), $server, $content);

        $this->request = $this->filterRequest($this->internalRequest);

        if (true === $changeHistory) {
            $this->history->add($this->internalRequest);
        }

        if ($this->insulated) {
            $this->response = $this->doRequestInProcess($this->request);
        } else {
            $this->response = $this->doRequest($this->request);
        }

        $this->internalResponse = $this->filterResponse($this->response);

        $this->cookieJar->updateFromResponse($this->internalResponse, $uri);

        $status = $this->internalResponse->getStatusCode();

        if ($status >= 300 && $status < 400) {
            $this->redirect = $this->internalResponse->getHeader('Location');
        } else {
            $this->redirect = null;
        }

        if ($this->followRedirects && $this->redirect) {
            $this->redirects[serialize($this->history->current())] = true;

            return $this->crawler = $this->followRedirect();
        }

        $this->crawler = $this->createCrawlerFromContent($this->internalRequest->getUri(), $this->internalResponse->getContent(), $this->internalResponse->getHeader('Content-Type'));

        // Check for meta refresh redirect
        if ($this->followMetaRefresh && null !== $redirect = $this->getMetaRefreshUrl()) {
            $this->redirect = $redirect;
            $this->redirects[serialize($this->history->current())] = true;
            $this->crawler = $this->followRedirect();
        }

        return $this->crawler;
    }

    /**
     * Makes a request in another process.
     *
     * @param object $request An origin request instance
     *
     * @return object An origin response instance
     *
     * @throws \RuntimeException When processing returns exit code
     */
    protected function doRequestInProcess($request)
    {
        $deprecationsFile = tempnam(sys_get_temp_dir(), 'deprec');
        putenv('SYMFONY_DEPRECATIONS_SERIALIZE='.$deprecationsFile);
        $_ENV['SYMFONY_DEPRECATIONS_SERIALIZE'] = $deprecationsFile;
        $process = new PhpProcess($this->getScript($request), null, null);
        $process->run();

        if (file_exists($deprecationsFile)) {
            $deprecations = file_get_contents($deprecationsFile);
            unlink($deprecationsFile);
            foreach ($deprecations ? unserialize($deprecations) : [] as $deprecation) {
                if ($deprecation[0]) {
                    @trigger_error($deprecation[1], E_USER_DEPRECATED);
                } else {
                    @trigger_error($deprecation[1], E_USER_DEPRECATED);
                }
            }
        }

        if (!$process->isSuccessful() || !preg_match('/^O\:\d+\:/', $process->getOutput())) {
            throw new \RuntimeException(sprintf('OUTPUT: %s ERROR OUTPUT: %s', $process->getOutput(), $process->getErrorOutput()));
        }

        return unserialize($process->getOutput());
    }

    /**
     * Makes a request.
     *
     * @param object $request An origin request instance
     *
     * @return object An origin response instance
     */
    abstract protected function doRequest($request);

    /**
     * Returns the script to execute when the request must be insulated.
     *
     * @param object $request An origin request instance
     *
     * @throws \LogicException When this abstract class is not implemented
     */
    protected function getScript($request)
    {
        throw new \LogicException('To insulate requests, you need to override the getScript() method.');
    }

    /**
     * Filters the BrowserKit request to the origin one.
     *
     * @param Request $request The BrowserKit Request to filter
     *
     * @return object An origin request instance
     */
    protected function filterRequest(Request $request)
    {
        return $request;
    }

    /**
     * Filters the origin response to the BrowserKit one.
     *
     * @param object $response The origin response to filter
     *
     * @return Response An BrowserKit Response instance
     */
    protected function filterResponse($response)
    {
        return $response;
    }

    /**
     * Creates a crawler.
     *
     * This method returns null if the DomCrawler component is not available.
     *
     * @param string $uri     A URI
     * @param string $content Content for the crawler to use
     * @param string $type    Content type
     *
     * @return Crawler|null
     */
    protected function createCrawlerFromContent($uri, $content, $type)
    {
        if (!class_exists('Symfony\Component\DomCrawler\Crawler')) {
            return;
        }

        $crawler = new Crawler(null, $uri);
        $crawler->addContent($content, $type);

        return $crawler;
    }

    /**
     * Goes back in the browser history.
     *
     * @return Crawler
     */
    public function back()
    {
        do {
            $request = $this->history->back();
        } while (\array_key_exists(serialize($request), $this->redirects));

        return $this->requestFromRequest($request, false);
    }

    /**
     * Goes forward in the browser history.
     *
     * @return Crawler
     */
    public function forward()
    {
        do {
            $request = $this->history->forward();
        } while (\array_key_exists(serialize($request), $this->redirects));

        return $this->requestFromRequest($request, false);
    }

    /**
     * Reloads the current browser.
     *
     * @return Crawler
     */
    public function reload()
    {
        return $this->requestFromRequest($this->history->current(), false);
    }

    /**
     * Follow redirects?
     *
     * @return Crawler
     *
     * @throws \LogicException If request was not a redirect
     */
    public function followRedirect()
    {
        if (empty($this->redirect)) {
            throw new \LogicException('The request was not redirected.');
        }

        if (-1 !== $this->maxRedirects) {
            if ($this->redirectCount > $this->maxRedirects) {
                $this->redirectCount = 0;
                throw new \LogicException(sprintf('The maximum number (%d) of redirections was reached.', $this->maxRedirects));
            }
        }

        $request = $this->internalRequest;

        if (\in_array($this->internalResponse->getStatusCode(), [301, 302, 303])) {
            $method = 'GET';
            $files = [];
            $content = null;
        } else {
            $method = $request->getMethod();
            $files = $request->getFiles();
            $content = $request->getContent();
        }

        if ('GET' === strtoupper($method)) {
            // Don't forward parameters for GET request as it should reach the redirection URI
            $parameters = [];
        } else {
            $parameters = $request->getParameters();
        }

        $server = $request->getServer();
        $server = $this->updateServerFromUri($server, $this->redirect);

        $this->isMainRequest = false;

        $response = $this->request($method, $this->redirect, $parameters, $files, $server, $content);

        $this->isMainRequest = true;

        return $response;
    }

    /**
     * @see https://dev.w3.org/html5/spec-preview/the-meta-element.html#attr-meta-http-equiv-refresh
     */
    private function getMetaRefreshUrl(): ?string
    {
        $metaRefresh = $this->getCrawler()->filter('head meta[http-equiv="refresh"]');
        foreach ($metaRefresh->extract(['content']) as $content) {
            if (preg_match('/^\s*0\s*;\s*URL\s*=\s*(?|\'([^\']++)|"([^"]++)|([^\'"].*))/i', $content, $m)) {
                return str_replace("\t\r\n", '', rtrim($m[1]));
            }
        }

        return null;
    }

    /**
     * Restarts the client.
     *
     * It flushes history and all cookies.
     */
    public function restart()
    {
        $this->cookieJar->clear();
        $this->history->clear();
    }

    /**
     * Takes a URI and converts it to absolute if it is not already absolute.
     *
     * @param string $uri A URI
     *
     * @return string An absolute URI
     */
    protected function getAbsoluteUri($uri)
    {
        // already absolute?
        if (0 === strpos($uri, 'http://') || 0 === strpos($uri, 'https://')) {
            return $uri;
        }

        if (!$this->history->isEmpty()) {
            $currentUri = $this->history->current()->getUri();
        } else {
            $currentUri = sprintf('http%s://%s/',
                isset($this->server['HTTPS']) ? 's' : '',
                isset($this->server['HTTP_HOST']) ? $this->server['HTTP_HOST'] : 'localhost'
            );
        }

        // protocol relative URL
        if (0 === strpos($uri, '//')) {
            return parse_url($currentUri, PHP_URL_SCHEME).':'.$uri;
        }

        // anchor or query string parameters?
        if (!$uri || '#' == $uri[0] || '?' == $uri[0]) {
            return preg_replace('/[#?].*?$/', '', $currentUri).$uri;
        }

        if ('/' !== $uri[0]) {
            $path = parse_url($currentUri, PHP_URL_PATH);

            if ('/' !== substr($path, -1)) {
                $path = substr($path, 0, strrpos($path, '/') + 1);
            }

            $uri = $path.$uri;
        }

        return preg_replace('#^(.*?//[^/]+)\/.*$#', '$1', $currentUri).$uri;
    }

    /**
     * Makes a request from a Request object directly.
     *
     * @param Request $request       A Request instance
     * @param bool    $changeHistory Whether to update the history or not (only used internally for back(), forward(), and reload())
     *
     * @return Crawler
     */
    protected function requestFromRequest(Request $request, $changeHistory = true)
    {
        return $this->request($request->getMethod(), $request->getUri(), $request->getParameters(), $request->getFiles(), $request->getServer(), $request->getContent(), $changeHistory);
    }

    private function updateServerFromUri($server, $uri)
    {
        $server['HTTP_HOST'] = $this->extractHost($uri);
        $scheme = parse_url($uri, PHP_URL_SCHEME);
        $server['HTTPS'] = null === $scheme ? $server['HTTPS'] : 'https' == $scheme;
        unset($server['HTTP_IF_NONE_MATCH'], $server['HTTP_IF_MODIFIED_SINCE']);

        return $server;
    }

    private function extractHost($uri)
    {
        $host = parse_url($uri, PHP_URL_HOST);

        if ($port = parse_url($uri, PHP_URL_PORT)) {
            return $host.':'.$port;
        }

        return $host;
    }
}