settings.php

<?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/>.

/**
 * Plugin administration pages are defined here.
 *
 * @package     fileconverter_librelambda
 * @copyright   2018 Matt Porritt <mattp@catalyst-au.net>
 * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

if ($hassiteconfig) {
    // Check if we are actually on the plugin settings page.
    $librelambdapage = false;
    if ($PAGE->has_set_url()) {
        $settingsurl = new moodle_url('/admin/settings.php');
        $thisurl = $PAGE->url;
        if ($settingsurl->compare($thisurl,  URL_MATCH_BASE) &&
                $thisurl->get_param('section') == 'fileconverterlibrelambda') {
            $librelambdapage = true;
        }
    }

    $converter = new \fileconverter_librelambda\converter();
    $clientcheck = $librelambdapage ? $converter->define_client_check() : '';
    $sdkcheck = $librelambdapage ? $converter->define_client_check_sdk() : '';

    $settings->add(new admin_setting_heading('fileconverter_librelambda/generalsettings',
            new lang_string('settings:generalheader', 'fileconverter_librelambda'), ''));

    $settings->add(new admin_setting_configduration('fileconverter_librelambda/conversion_timeout',
            get_string('settings:conversion_timeout', 'fileconverter_librelambda'),
            get_string('settings:conversion_timeout_help', 'fileconverter_librelambda'),
            3600,
            HOURSECS));

    $settings->add(new admin_setting_configcheckbox('fileconverter_librelambda/useproxy',
        get_string('settings:useproxy', 'fileconverter_librelambda'),
        get_string('settings:useproxy_help', 'fileconverter_librelambda'), 1));

    $settings->add(new \admin_setting_heading('fileconverter_librelambda/aws',
        new \lang_string('settings:aws:header', 'fileconverter_librelambda'), $clientcheck));

    $settings->add(new \admin_setting_configcheckbox('fileconverter_librelambda/usesdkcreds',
        new \lang_string('settings:aws:usesdkcreds', 'fileconverter_librelambda'), $sdkcheck, ''));

    if (!$converter->get_usesdkcreds()) {
        // Basic settings.
        $settings->add(new admin_setting_configtext('fileconverter_librelambda/api_key',
            get_string('settings:aws:key', 'fileconverter_librelambda'),
            get_string('settings:aws:key_help', 'fileconverter_librelambda'),
            ''));

        $settings->add(new admin_setting_configpasswordunmask('fileconverter_librelambda/api_secret',
            get_string('settings:aws:secret', 'fileconverter_librelambda'),
            get_string('settings:aws:secret_help', 'fileconverter_librelambda'),
            ''));
    }

    $settings->add(new admin_setting_configtext('fileconverter_librelambda/s3_input_bucket',
            get_string('settings:aws:input_bucket', 'fileconverter_librelambda'),
            get_string('settings:aws:input_bucket_help', 'fileconverter_librelambda'),
            ''));

    $settings->add(new admin_setting_configtext('fileconverter_librelambda/s3_output_bucket',
            get_string('settings:aws:output_bucket', 'fileconverter_librelambda'),
            get_string('settings:aws:output_bucket_help', 'fileconverter_librelambda'),
            ''));

    $regionoptions = array(
        'us-east-1'      => 'us-east-1 (N. Virginia)',
        'us-east-2'      => 'us-east-2 (Ohio)',
        'us-west-1'      => 'us-west-1 (N. California)',
        'us-west-2'      => 'us-west-2 (Oregon)',
        'ap-northeast-1' => 'ap-northeast-1 (Tokyo)',
        'ap-northeast-2' => 'ap-northeast-2 (Seoul)',
        'ap-northeast-3' => 'ap-northeast-3 (Osaka)',
        'ap-south-1'     => 'ap-south-1 (Mumbai)',
        'ap-southeast-1' => 'ap-southeast-1 (Singapore)',
        'ap-southeast-2' => 'ap-southeast-2 (Sydney)',
        'ca-central-1'   => 'ca-central-1 (Canda Central)',
        'cn-north-1'     => 'cn-north-1 (Beijing)',
        'cn-northwest-1' => 'cn-northwest-1 (Ningxia)',
        'eu-central-1'   => 'eu-central-1 (Frankfurt)',
        'eu-west-1'      => 'eu-west-1 (Ireland)',
        'eu-west-2'      => 'eu-west-2 (London)',
        'eu-west-3'      => 'eu-west-3 (Paris)',
        'sa-east-1'      => 'sa-east-1 (Sao Paulo)'
    );

    $settings->add(new admin_setting_configselect('fileconverter_librelambda/api_region',
            get_string('settings:aws:region', 'fileconverter_librelambda'),
            get_string('settings:aws:region_help', 'fileconverter_librelambda'),
            'ap-southeast-2',
            $regionoptions));

}