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liveuser |
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<?php
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namespace React\Socket;
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use React\Dns\Resolver\ResolverInterface;
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use React\Promise;
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use React\Promise\CancellablePromiseInterface;
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final class DnsConnector implements ConnectorInterface
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{
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private $connector;
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private $resolver;
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public function __construct(ConnectorInterface $connector, ResolverInterface $resolver)
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{
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$this->connector = $connector;
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$this->resolver = $resolver;
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}
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public function connect($uri)
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{
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if (\strpos($uri, '://') === false) {
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$parts = \parse_url('tcp://' . $uri);
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unset($parts['scheme']);
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} else {
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$parts = \parse_url($uri);
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}
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if (!$parts || !isset($parts['host'])) {
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return Promise\reject(new \InvalidArgumentException('Given URI "' . $uri . '" is invalid'));
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}
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$host = \trim($parts['host'], '[]');
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$connector = $this->connector;
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// skip DNS lookup / URI manipulation if this URI already contains an IP
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if (false !== \filter_var($host, \FILTER_VALIDATE_IP)) {
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return $connector->connect($uri);
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}
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$promise = $this->resolver->resolve($host);
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$resolved = null;
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return new Promise\Promise(
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function ($resolve, $reject) use (&$promise, &$resolved, $uri, $connector, $host, $parts) {
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// resolve/reject with result of DNS lookup
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$promise->then(function ($ip) use (&$promise, &$resolved, $connector, $host, $parts) {
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$resolved = $ip;
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$uri = '';
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// prepend original scheme if known
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if (isset($parts['scheme'])) {
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$uri .= $parts['scheme'] . '://';
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}
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if (\strpos($ip, ':') !== false) {
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// enclose IPv6 addresses in square brackets before appending port
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$uri .= '[' . $ip . ']';
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} else {
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$uri .= $ip;
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}
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// append original port if known
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if (isset($parts['port'])) {
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$uri .= ':' . $parts['port'];
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}
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// append orignal path if known
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if (isset($parts['path'])) {
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$uri .= $parts['path'];
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}
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// append original query if known
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if (isset($parts['query'])) {
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$uri .= '?' . $parts['query'];
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}
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// append original hostname as query if resolved via DNS and if
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// destination URI does not contain "hostname" query param already
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$args = array();
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\parse_str(isset($parts['query']) ? $parts['query'] : '', $args);
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if ($host !== $ip && !isset($args['hostname'])) {
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$uri .= (isset($parts['query']) ? '&' : '?') . 'hostname=' . \rawurlencode($host);
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}
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// append original fragment if known
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if (isset($parts['fragment'])) {
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$uri .= '#' . $parts['fragment'];
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}
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return $promise = $connector->connect($uri);
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}, function ($e) use ($uri, $reject) {
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$reject(new \RuntimeException('Connection to ' . $uri .' failed during DNS lookup: ' . $e->getMessage(), 0, $e));
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})->then($resolve, $reject);
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},
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function ($_, $reject) use (&$promise, &$resolved, $uri) {
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// cancellation should reject connection attempt
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// reject DNS resolution with custom reason, otherwise rely on connection cancellation below
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if ($resolved === null) {
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$reject(new \RuntimeException('Connection to ' . $uri . ' cancelled during DNS lookup'));
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}
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// (try to) cancel pending DNS lookup / connection attempt
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if ($promise instanceof CancellablePromiseInterface) {
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// overwrite callback arguments for PHP7+ only, so they do not show
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// up in the Exception trace and do not cause a possible cyclic reference.
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$_ = $reject = null;
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$promise->cancel();
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$promise = null;
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}
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}
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);
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}
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}
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