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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 core_external\external_api; |
| 20 | use tool_autoflow\local\engine\node_failed; |
| 21 | use tool_autoflow\local\engine\node_result; |
| 22 | use tool_autoflow\local\engine\node_type; |
| 23 | use tool_autoflow\local\engine\param; |
| 24 | |
| 25 | /** |
| 26 | * Calls any Moodle web service function: the Moodle API as one node. |
| 27 | * |
| 28 | * The call follows external_api::call_external_function() without its sesskey check, |
| 29 | * which protects browser sessions and has no meaning in a cron task: the arguments are |
| 30 | * validated against the function's definition, the function runs its own context and |
| 31 | * capability checks as the user the workflow runs as, and the result is cleaned. |
| 32 | * Arguments are a JSON object whose values may hold placeholders. Placeholders are |
| 33 | * filled value by value, never pasted into JSON text, so trigger data cannot add |
| 34 | * or change keys. |
| 35 | * |
| 36 | * @package tool_autoflow |
| 37 | * @copyright 2026 DevLMS <contact@devlms.com> |
| 38 | * @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later |
| 39 | */ |
| 40 | final class call_function_node implements node_type { |
| 41 | /** |
| 42 | * Type name. |
| 43 | * |
| 44 | * @return string |
| 45 | */ |
| 46 | public function type(): string { |
| 47 | return 'moodle.call_function'; |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * Parameters. |
| 52 | * |
| 53 | * @return param[] |
| 54 | */ |
| 55 | public function params(): array { |
| 56 | return [new param('function', 'function', true), new param('args', 'json', false)]; |
| 57 | } |
| 58 | |
| 59 | /** |
| 60 | * Branches. |
| 61 | * |
| 62 | * @return string[] |
| 63 | */ |
| 64 | public function branches(): array { |
| 65 | return []; |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Call the function. |
| 70 | * |
| 71 | * @param array $params function, args |
| 72 | * @param array $context |
| 73 | * @return node_result |
| 74 | */ |
| 75 | public function execute(array $params, array $context): node_result { |
| 76 | $function = (string) ($params['function'] ?? ''); |
| 77 | $args = $params['args'] ?? []; |
| 78 | if (!is_array($args)) { |
| 79 | throw new node_failed('The arguments must be a JSON object.'); |
| 80 | } |
| 81 | return new node_result(['result' => self::call($function, $args)]); |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * Call a web service function as the current user, the way the web service layer does. |
| 86 | * |
| 87 | * Other Moodle nodes use this too, so they get the same validation and capability checks. |
| 88 | * |
| 89 | * @param string $function |
| 90 | * @param array $args |
| 91 | * @return mixed The cleaned result. |
| 92 | */ |
| 93 | public static function call(string $function, array $args): mixed { |
| 94 | try { |
| 95 | $info = external_api::external_function_info($function); |
| 96 | $values = array_values(external_api::validate_parameters($info->parameters_desc, $args)); |
| 97 | $result = call_user_func_array([$info->classname, $info->methodname], $values); |
| 98 | if ($info->returns_desc !== null) { |
| 99 | $result = external_api::clean_returnvalue($info->returns_desc, $result); |
| 100 | } |
| 101 | } catch (\Throwable $e) { |
| 102 | throw new node_failed("$function: " . $e->getMessage()); |
| 103 | } |
| 104 | return $result; |
| 105 | } |
| 106 | } |