OneLogin_Saml2_Settings::checkSPSettings PHP Method

    public function checkSPSettings($settings)
    {
        assert('is_array($settings)');
        if (!is_array($settings) || empty($settings)) {
            return array('invalid_syntax');
        }
        $errors = array();
        if (!isset($settings['sp']) || empty($settings['sp'])) {
            $errors[] = 'sp_not_found';
        } else {
            $sp = $settings['sp'];
            $security = array();
            if (isset($settings['security'])) {
                $security = $settings['security'];
            }
            if (!isset($sp['entityId']) || empty($sp['entityId'])) {
                $errors[] = 'sp_entityId_not_found';
            }
            if (!isset($sp['assertionConsumerService']) || !isset($sp['assertionConsumerService']['url']) || empty($sp['assertionConsumerService']['url'])) {
                $errors[] = 'sp_acs_not_found';
            } else {
                if (!filter_var($sp['assertionConsumerService']['url'], FILTER_VALIDATE_URL)) {
                    $errors[] = 'sp_acs_url_invalid';
                }
            }
            if (isset($sp['singleLogoutService']) && isset($sp['singleLogoutService']['url']) && !filter_var($sp['singleLogoutService']['url'], FILTER_VALIDATE_URL)) {
                $errors[] = 'sp_sls_url_invalid';
            }
            if (isset($security['signMetadata']) && is_array($security['signMetadata'])) {
                if (!isset($security['signMetadata']['keyFileName']) || !isset($security['signMetadata']['certFileName'])) {
                    $errors[] = 'sp_signMetadata_invalid';
                }
            }
            if ((isset($security['authnRequestsSigned']) && $security['authnRequestsSigned'] == true || isset($security['logoutRequestSigned']) && $security['logoutRequestSigned'] == true || isset($security['logoutResponseSigned']) && $security['logoutResponseSigned'] == true || isset($security['wantAssertionsEncrypted']) && $security['wantAssertionsEncrypted'] == true || isset($security['wantNameIdEncrypted']) && $security['wantNameIdEncrypted'] == true) && !$this->checkSPCerts()) {
                $errors[] = 'sp_certs_not_found_and_required';
            }
        }
        if (isset($settings['contactPerson'])) {
            $types = array_keys($settings['contactPerson']);
            $validTypes = array('technical', 'support', 'administrative', 'billing', 'other');
            foreach ($types as $type) {
                if (!in_array($type, $validTypes)) {
                    $errors[] = 'contact_type_invalid';
                    break;
                }
            }
            foreach ($settings['contactPerson'] as $type => $contact) {
                if (!isset($contact['givenName']) || empty($contact['givenName']) || !isset($contact['emailAddress']) || empty($contact['emailAddress'])) {
                    $errors[] = 'contact_not_enought_data';
                    break;
                }
            }
        }
        if (isset($settings['organization'])) {
            foreach ($settings['organization'] as $organization) {
                if (!isset($organization['name']) || empty($organization['name']) || !isset($organization['displayname']) || empty($organization['displayname']) || !isset($organization['url']) || empty($organization['url'])) {
                    $errors[] = 'organization_not_enought_data';
                    break;
                }
            }
        }
        return $errors;
    }