backend.php

<?php

class DtaBackendUtils {

    /**
     * @return string backend host base url
     */
    private static function getBackendBaseUrl(): string {
        $backendAddress = get_config(assign_submission_dta::COMPONENT_NAME, "backendHost");

        if (empty($backendAddress)) {
            \core\notification::error(get_string("backendHost_not_set", assign_submission_dta::COMPONENT_NAME));
        }

        return $backendAddress;
    }

    /**
     * Sends the configuration textfile uploaded by prof to the backend
     *
     * @param $assignment assignment this test-config belongs to
     * @param $file uploaded test-config
     *
     * @return bool true if no error occurred
     */
    public static function sendTestConfigToBackend($assignment, $file): bool {
        $backendAddress = self::getBackendBaseUrl();
        if (empty($backendAddress)) {
            return true;
        }

        // set endpoint for test upload
        $url = $backendAddress . "/v1/unittest";

        // prepare params
        $params = array(
            "unitTestFile" => $file,
            "assignmentId" => $assignment->get_instance()->id
        );

        // if request returned null, return false to indicate failure
        if (is_null(self::post($url, $params))) {
            return false;
        } else {
            return true;
        }
    }

    /**
     * Sends sumbission config or archive to backend to be tested
     *
     * @param $assignment assignment this submission is done for
     * @param $file submission config file or archive with submission
     *
     * @return string json string with testresults or null on error
     */
    public static function sendSubmissionToBackend($assignment, $file): ?string {
        $backendAddress = self::getBackendBaseUrl();
        if (empty($backendAddress)) {
            return true;
        }

        // set endpoint for test upload
        $url = $backendAddress . "/v1/task";

        // prepare params
        $params = array(
            "taskFile" => $file,
            "assignmentId" => $assignment->get_instance()->id
        );