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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* AWS helper class. Contains useful functions when interacting with the SDK.
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*
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* @package core
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* @author Peter Burnett <peterburnett@catalyst-au.net>
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* @copyright 2020 Catalyst IT
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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namespace core\aws;
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use Aws\CommandInterface;
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use Aws\AwsClient;
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use Psr\Http\Message\RequestInterface;
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/**
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* This class contains functions that help plugins to interact with the AWS SDK.
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*
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* @copyright 2020 Catalyst IT
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class aws_helper {
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/**
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* This creates a proxy string suitable for use with the AWS SDK.
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*
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* @return string the string to use for proxy settings.
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*/
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public static function get_proxy_string(): string {
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global $CFG;
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$proxy = '';
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if (empty($CFG->proxytype)) {
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return $proxy;
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}
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if ($CFG->proxytype === 'SOCKS5') {
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// If it is a SOCKS proxy, append the protocol info.
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$protocol = 'socks5://';
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} else {
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$protocol = '';
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}
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if (!empty($CFG->proxyhost)) {
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$proxy = $CFG->proxyhost;
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if (!empty($CFG->proxyport)) {
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$proxy .= ':'. $CFG->proxyport;
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}
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if (!empty($CFG->proxyuser) && !empty($CFG->proxypassword)) {
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$proxy = $protocol . $CFG->proxyuser . ':' . $CFG->proxypassword . '@' . $proxy;
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}
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}
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return $proxy;
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}
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/**
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* Configure the provided AWS client to route traffic via the moodle proxy for any hosts not excluded.
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*
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* @param AwsClient $client
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* @return AwsClient
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*/
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public static function configure_client_proxy(AwsClient $client): AwsClient {
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$client->getHandlerList()->appendBuild(self::add_proxy_when_required(), 'proxy_bypass');
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return $client;
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}
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/**
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* Generate a middleware higher order function to wrap the handler and append proxy configuration based on target.
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*
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* @return callable Middleware high order callable.
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*/
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protected static function add_proxy_when_required(): callable {
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return function (callable $fn) {
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return function (CommandInterface $command, ?RequestInterface $request = null) use ($fn) {
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if (isset($request)) {
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$target = (string) $request->getUri();
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if (!is_proxybypass($target)) {
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$command['@http']['proxy'] = self::get_proxy_string();
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}
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}
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$promise = $fn($command, $request);
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return $promise;
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};
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};
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}
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}
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