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| 1 | <?php |
| 2 | // This file is part of Moodle - https://moodle.org/ |
| 3 | // |
| 4 | // Moodle is free software: you can redistribute it and/or modify |
| 5 | // it under the terms of the GNU General Public License as published by |
| 6 | // the Free Software Foundation, either version 3 of the License, or |
| 7 | // (at your option) any later version. |
| 8 | // |
| 9 | // Moodle is distributed in the hope that it will be useful, |
| 10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | // GNU General Public License for more details. |
| 13 | // |
| 14 | // You should have received a copy of the GNU General Public License |
| 15 | // along with Moodle. If not, see <https://www.gnu.org/licenses/>. |
| 16 | |
| 17 | namespace tool_autoflow\local\nodes; |
| 18 | |
| 19 | use tool_autoflow\local\engine\node_failed; |
| 20 | use tool_autoflow\local\engine\node_result; |
| 21 | use tool_autoflow\local\engine\node_type; |
| 22 | use tool_autoflow\local\engine\param; |
| 23 | |
| 24 | /** |
| 25 | * Sends an HTTP request to another service and returns its answer. |
| 26 | * |
| 27 | * Requests go through Moodle's curl class, so the site's HTTP security settings |
| 28 | * (blocked hosts and allowed ports, which block local and private addresses by |
| 29 | * default) apply to the first URL and to every redirect. Only http and https are |
| 30 | * allowed, requests time out, redirects and response size are capped, and headers |
| 31 | * are checked so a placeholder value cannot add a header of its own. |
| 32 | * |
| 33 | * @package tool_autoflow |
| 34 | * @copyright 2026 DevLMS <contact@devlms.com> |
| 35 | * @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later |
| 36 | */ |
| 37 | final class http_request_node implements node_type { |
| 38 | /** Largest response body kept, in bytes. */ |
| 39 | public const MAX_BYTES = 262144; |
| 40 | |
| 41 | /** Methods the node can send. */ |
| 42 | private const METHODS = ['get', 'post', 'put', 'patch', 'delete']; |
| 43 | |
| 44 | /** @var \Closure|null Makes the curl object; tests pass their own. */ |
| 45 | private readonly ?\Closure $makecurl; |
| 46 | |
| 47 | /** |
| 48 | * Create the node. |
| 49 | * |
| 50 | * @param \Closure|null $makecurl Returns a \curl. Defaults to {@see self::make_curl()}. |
| 51 | */ |
| 52 | public function __construct(?\Closure $makecurl = null) { |
| 53 | $this->makecurl = $makecurl; |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * Type name. |
| 58 | * |
| 59 | * @return string |
| 60 | */ |
| 61 | public function type(): string { |
| 62 | return 'action.http'; |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Parameters. |
| 67 | * |
| 68 | * @return param[] |
| 69 | */ |
| 70 | public function params(): array { |
| 71 | return [ |
| 72 | new param('method', 'select', true, self::METHODS), |
| 73 | new param('url', 'text', true), |
| 74 | new param('headers', 'json', false), |
| 75 | new param('body', 'json', false), |
| 76 | ]; |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * Branches. |
| 81 | * |
| 82 | * @return string[] |
| 83 | */ |
| 84 | public function branches(): array { |
| 85 | return []; |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * A curl object with the node's limits. |
| 90 | * |
| 91 | * @return \curl |
| 92 | */ |
| 93 | public static function make_curl(): \curl { |
| 94 | global $CFG; |
| 95 | require_once($CFG->libdir . '/filelib.php'); |
| 96 | $curl = new \curl(); |
| 97 | $curl->setopt([ |
| 98 | 'CURLOPT_TIMEOUT' => 15, |
| 99 | 'CURLOPT_CONNECTTIMEOUT' => 5, |
| 100 | 'CURLOPT_MAXREDIRS' => 3, |
| 101 | 'CURLOPT_MAXFILESIZE' => self::MAX_BYTES, |
| 102 | 'CURLOPT_PROTOCOLS' => CURLPROTO_HTTP | CURLPROTO_HTTPS, |
| 103 | ]); |
| 104 | return $curl; |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * Header lines from a JSON object of names and plain values. |
| 109 | * |
| 110 | * @param mixed $headers |
| 111 | * @param bool $jsonbody Whether the body is JSON, which adds a Content-Type unless one is set. |
| 112 | * @return string[] |
| 113 | */ |
| 114 | public static function header_lines(mixed $headers, bool $jsonbody): array { |
| 115 | if (!is_array($headers) || ($headers && array_is_list($headers))) { |
| 116 | throw new node_failed('Headers must be a JSON object of names and values.'); |
| 117 | } |
| 118 | $lines = []; |
| 119 | $hastype = false; |
| 120 | foreach ($headers as $name => $value) { |
| 121 | $name = (string) $name; |
| 122 | if (!preg_match('/^[A-Za-z0-9!#$%&\'*+.^_\x60|~-]+$/', $name)) { |
| 123 | throw new node_failed("\"$name\" is not a valid header name."); |
| 124 | } |
| 125 | if (!is_scalar($value) || preg_match('/[\r\n\0]/', (string) $value)) { |
| 126 | throw new node_failed("The header $name must be one line of text."); |
| 127 | } |
| 128 | $hastype = $hastype || strtolower($name) === 'content-type'; |
| 129 | $lines[] = $name . ': ' . $value; |
| 130 | } |
| 131 | if ($jsonbody && !$hastype) { |
| 132 | $lines[] = 'Content-Type: application/json'; |
| 133 | } |
| 134 | return $lines; |
| 135 | } |
| 136 | |
| 137 | /** |
| 138 | * Send the request. |
| 139 | * |
| 140 | * @param array $params method, url, headers, body |
| 141 | * @param array $context |
| 142 | * @return node_result status, body, json (the decoded body or null) and truncated. |
| 143 | */ |
| 144 | public function execute(array $params, array $context): node_result { |
| 145 | $method = strtolower(trim((string) ($params['method'] ?? '')) ?: 'get'); |
| 146 | if (!in_array($method, self::METHODS, true)) { |
| 147 | throw new node_failed('The method must be GET, POST, PUT, PATCH or DELETE, not ' . strtoupper($method) . '.'); |
| 148 | } |
| 149 | $url = trim((string) ($params['url'] ?? '')); |
| 150 | $scheme = strtolower((string) parse_url($url, PHP_URL_SCHEME)); |
| 151 | if (!in_array($scheme, ['http', 'https'], true) || !parse_url($url, PHP_URL_HOST)) { |
| 152 | throw new node_failed("The URL must start with http or https: \"$url\"."); |
| 153 | } |
| 154 | $body = $params['body'] ?? []; |
| 155 | if (is_string($body) && trim($body) === '') { |
| 156 | $body = []; |
| 157 | } |
| 158 | if (!is_array($body) || ($body && array_is_list($body))) { |
| 159 | throw new node_failed('The body must be a JSON object.'); |
| 160 | } |
| 161 | $jsonbody = $body !== []; |
| 162 | $payload = $jsonbody ? json_encode($body) : ''; |
| 163 | $headers = self::header_lines($params['headers'] ?? [], $jsonbody); |
| 164 | |
| 165 | $curl = $this->makecurl ? ($this->makecurl)() : self::make_curl(); |
| 166 | if ($headers) { |
| 167 | $curl->setHeader($headers); |
| 168 | } |
| 169 | $response = $method === 'get' |
| 170 | ? $curl->get($url) |
| 171 | : $curl->post($url, $payload, ['CURLOPT_CUSTOMREQUEST' => strtoupper($method)]); |
| 172 | if (!empty($curl->error)) { |
| 173 | throw new node_failed("$url could not be reached: {$curl->error}"); |
| 174 | } |
| 175 | $status = (int) ($curl->info['http_code'] ?? 0); |
| 176 | $response = (string) $response; |
| 177 | $truncated = strlen($response) > self::MAX_BYTES; |
| 178 | if ($truncated) { |
| 179 | $response = substr($response, 0, self::MAX_BYTES); |
| 180 | } |
| 181 | if ($status >= 400 || $status === 0) { |
| 182 | throw new node_failed("$url answered $status: " . shorten_text($response, 200)); |
| 183 | } |
| 184 | $json = json_decode($response, true); |
| 185 | return new node_result([ |
| 186 | 'status' => $status, |
| 187 | 'body' => $response, |
| 188 | 'json' => is_array($json) ? $json : null, |
| 189 | 'truncated' => $truncated, |
| 190 | ]); |
| 191 | } |
| 192 | } |