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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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* This file contains functions used by upgrade and install.
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*
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* Because this is used during install it should not include additional files.
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*
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* @package mod_lti
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* @copyright 2019 Damyon Wiese
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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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defined('MOODLE_INTERNAL') || die();
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/**
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* This function checks if a private key has been generated for this site.
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*
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* If the key does not exist it generates a new one. If the openssl
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* extension is not installed or configured properly it returns a warning message.
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*
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* @return string A warning message if a private key does not exist and cannot be generated.
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*/
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function mod_lti_verify_private_key() {
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$key = get_config('mod_lti', 'privatekey');
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// If we already generated a valid key, no need to check.
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if (empty($key)) {
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// Create the private key.
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$kid = bin2hex(openssl_random_pseudo_bytes(10));
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set_config('kid', $kid, 'mod_lti');
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$config = array(
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"digest_alg" => "sha256",
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"private_key_bits" => 2048,
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"private_key_type" => OPENSSL_KEYTYPE_RSA,
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);
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$res = openssl_pkey_new($config);
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openssl_pkey_export($res, $privatekey);
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if (!empty($privatekey)) {
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set_config('privatekey', $privatekey, 'mod_lti');
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} else {
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return get_string('opensslconfiginvalid', 'mod_lti');
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}
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}
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return '';
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}
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