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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * SPDX-License-Identifier: EUPL-1.2 |
| 5 | * |
| 6 | * This file is part of icap-flow. |
| 7 | * |
| 8 | * Licensed under the EUPL, Version 1.2 only (the "Licence"); |
| 9 | * you may not use this work except in compliance with the Licence. |
| 10 | * You may obtain a copy of the Licence at: |
| 11 | * |
| 12 | * https://joinup.ec.europa.eu/collection/eupl/eupl-text-eupl-12 |
| 13 | * |
| 14 | * Unless required by applicable law or agreed to in writing, software |
| 15 | * distributed under the Licence is distributed on an "AS IS" basis, |
| 16 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 17 | */ |
| 18 | |
| 19 | declare(strict_types=1); |
| 20 | |
| 21 | namespace Ndrstmr\Icap\Transport; |
| 22 | |
| 23 | use Amp\ByteStream\StreamException; |
| 24 | use Amp\Cancellation; |
| 25 | use Amp\CancelledException; |
| 26 | use Amp\DeferredCancellation; |
| 27 | use Amp\Socket; |
| 28 | use Amp\Socket\ConnectContext; |
| 29 | use Amp\Socket\Socket as SocketInterface; |
| 30 | use Ndrstmr\Icap\Config; |
| 31 | use Ndrstmr\Icap\Exception\IcapConnectionException; |
| 32 | use Ndrstmr\Icap\Exception\IcapTimeoutException; |
| 33 | use Ndrstmr\Icap\IcapUri; |
| 34 | use Revolt\EventLoop; |
| 35 | |
| 36 | /** |
| 37 | * Opens the connection to an ICAP server in the two phases it has, each with a limit of its own (M10): the TCP |
| 38 | * connection within `socketTimeout`, and, with a TLS context, the handshake within `tlsHandshakeTimeout`. The |
| 39 | * handshake is a phase of its own because it can hang on a server that accepts the connection and says nothing, and |
| 40 | * `Socket\connectTls()` has no limit for it but the cancellation of the whole call. |
| 41 | * |
| 42 | * Otherwise it does what `connectTls()` does: the peer name of the TLS context is the host when it has none. The |
| 43 | * cancellation it is given ends both phases and stays an `Amp\CancelledException`; only the limit of the handshake is |
| 44 | * an {@see IcapTimeoutException}. A connection that cannot be made, a failed handshake or a stream that breaks while |
| 45 | * it is set up is an {@see IcapConnectionException} with the amphp exception as its cause. One place for the three |
| 46 | * ways to open a connection (transport, pool, null pool). |
| 47 | * |
| 48 | * @internal |
| 49 | */ |
| 50 | final class SocketOpener |
| 51 | { |
| 52 | /** |
| 53 | * @throws IcapConnectionException When the TCP connection cannot be made or the handshake fails |
| 54 | * @throws IcapTimeoutException When the handshake does not finish within `tlsHandshakeTimeout` |
| 55 | * @throws CancelledException When the cancellation ends the connection setup |
| 56 | */ |
| 57 | public static function open(Config $config, ?Cancellation $cancellation): SocketInterface |
| 58 | { |
| 59 | try { |
| 60 | return self::connect($config, $cancellation); |
| 61 | } catch (StreamException $e) { |
| 62 | throw new IcapConnectionException(sprintf('Connecting to %s:%d failed.', $config->host, $config->port), 0, $e); |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | private static function connect(Config $config, ?Cancellation $cancellation): SocketInterface |
| 67 | { |
| 68 | $tls = $config->getTlsContext(); |
| 69 | $url = IcapUri::tcp($config->host, $config->port); |
| 70 | $context = (new ConnectContext())->withConnectTimeout($config->getSocketTimeout()); |
| 71 | |
| 72 | if ($tls === null) { |
| 73 | return Socket\connect($url, $context, $cancellation); |
| 74 | } |
| 75 | |
| 76 | if ($tls->getPeerName() === '') { |
| 77 | $host = parse_url($url, PHP_URL_HOST); |
| 78 | $tls = $tls->withPeerName(is_string($host) ? $host : ''); |
| 79 | } |
| 80 | |
| 81 | $socket = Socket\connect($url, $context->withTlsContext($tls), $cancellation); |
| 82 | self::handshake($socket, $config->getTlsHandshakeTimeout(), $cancellation); |
| 83 | |
| 84 | return $socket; |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * The window of the handshake: its own limit, and the cancellation of the connection setup. A socket whose |
| 89 | * handshake failed is closed. |
| 90 | */ |
| 91 | private static function handshake(SocketInterface $socket, float $seconds, ?Cancellation $cancellation): void |
| 92 | { |
| 93 | $window = new DeferredCancellation(); |
| 94 | $expired = false; |
| 95 | $timer = EventLoop::delay($seconds, static function () use (&$expired, $window): void { |
| 96 | $expired = true; |
| 97 | $window->cancel(); |
| 98 | }); |
| 99 | $watch = $cancellation?->subscribe(static function () use ($window): void { |
| 100 | $window->cancel(); |
| 101 | }); |
| 102 | |
| 103 | try { |
| 104 | $socket->setupTls($window->getCancellation()); |
| 105 | } catch (\Throwable $e) { |
| 106 | $socket->close(); |
| 107 | |
| 108 | if ($e instanceof CancelledException) { |
| 109 | // The caller's cancellation, or the budget, stays what it is; only the limit of the handshake is ours. |
| 110 | $cancellation?->throwIfRequested(); |
| 111 | if ($expired) { |
| 112 | throw new IcapTimeoutException( |
| 113 | sprintf('The TLS handshake did not finish within %s seconds.', $seconds), |
| 114 | 0, |
| 115 | $e, |
| 116 | ); |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | throw $e; |
| 121 | } finally { |
| 122 | EventLoop::cancel($timer); |
| 123 | if ($cancellation !== null && $watch !== null) { |
| 124 | $cancellation->unsubscribe($watch); |
| 125 | } |
| 126 | } |
| 127 | } |
| 128 | } |