code/app/src/lib/session.ts


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import { log_error, log_info } from "$lib/logger";
import { Temporal } from "temporal-polyfill";
import { http_account } from "$lib/api/account";
import { is_guid, session_storage_get_json, session_storage_set_json } from "./helpers";
import { SECONDS_BETWEEN_SESSION_CHECK, StorageKeys } from "./configuration";
import type { Session } from "$lib/models/internal/ISession";

export async function is_active(forceRefresh: boolean = false): Promise<boolean> {
    const nowEpoch = Temporal.Now.instant().epochSeconds;
    const data = session_storage_get_json(StorageKeys.session) as Session;
    const expiryEpoch = data?.lastChecked + SECONDS_BETWEEN_SESSION_CHECK;
    const lastCheckIsStaleOrNone = !is_guid(data?.profile?.id) || (expiryEpoch < nowEpoch);
    if (forceRefresh || lastCheckIsStaleOrNone) {
        return await call_api();
    } else {
        const sessionIsValid = data.profile && is_guid(data.profile.id);
        if (!sessionIsValid) {
            clear_session_data();
            log_info("Session data is not valid");
        }
        return sessionIsValid;
    }
}

export async function end_session(cb: Function): Promise<void> {
    await http_account.logout_async();
    clear_session_data();
    cb();
}

async function call_api(): Promise<boolean> {
    log_info("Getting profile data while checking session state");
    try {
        const response = await http_account.get_profile_async(true);
        if (response.ok) {
            const userData = await response.json();
            if (is_guid(userData.id) && userData.username) {
                const session = {
                    profile: userData,
                    lastChecked: Temporal.Now.instant().epochSeconds
                } as Session;
                session_storage_set_json(StorageKeys.session, session);
                log_info("Successfully got profile data while checking session state");
                return true;
            } else {
                log_error("Api returned invalid data while getting profile data");
                clear_session_data();
                return false;
            }
        } else {
            log_error("Api returned unsuccessfully while getting profile data");
            clear_session_data();
            return false;
        }
    } catch (e) {
        log_error(e);
        clear_session_data();
        return false;
    }
}

export function clear_session_data() {
    session_storage_set_json(StorageKeys.session, {});
    log_info("Cleared session data.");
}

export function get_session_data(): Session {
    return session_storage_get_json(StorageKeys.session) as Session;
}