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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Form for scheduled tasks admin pages.
 *
 * @package    tool_task
 * @copyright  2018 Toni Barbera <toni@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace tool_task;

defined('MOODLE_INTERNAL') || die();

/**
 * Running tasks from CLI.
 *
 * @copyright  2018 Toni Barbera <toni@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class run_from_cli {

/**
     * Find the path of PHP CLI binary.
     *
     * @return string|false The PHP CLI executable PATH
     */
    protected static function find_php_cli_path() {
        global $CFG;

if (!empty($CFG->pathtophp) && is_executable(trim($CFG->pathtophp))) {
            return $CFG->pathtophp;
        }

return false;
    }

/**
     * Returns if Moodle have access to PHP CLI binary or not.
     *
     * @return bool
     */
    public static function is_runnable():bool {
        return self::find_php_cli_path() !== false;
    }

/**
     * Executes a cron from web invocation using PHP CLI.
     *
     * @param \core\task\task_base $task Task that be executed via CLI.
     * @return bool
     * @throws \moodle_exception
     */
    public static function execute(\core\task\task_base $task):bool {
        global $CFG;

if (!self::is_runnable()) {
            $redirecturl = new \moodle_url('/admin/settings.php', ['section' => 'systempaths']);
            throw new \moodle_exception('cannotfindthepathtothecli', 'tool_task', $redirecturl->out());
        } else {
            // Shell-escaped path to the PHP binary.
            $phpbinary = escapeshellarg(self::find_php_cli_path());

// Shell-escaped path CLI script.
            $pathcomponents = [$CFG->dirroot, $CFG->admin, 'tool', 'task', 'cli', 'schedule_task.php'];
            $scriptpath     = escapeshellarg(implode(DIRECTORY_SEPARATOR, $pathcomponents));

// Shell-escaped task name.
            $classname = get_class($task);
            $taskarg   = escapeshellarg("--execute={$classname}");

// Build the CLI command.
            $command = "{$phpbinary} {$scriptpath} {$taskarg}";

// Execute it.
            passthru($command);
        }

return true;
    }
}