hmpps-open-layers-map/dist/scripts/map/token-refresh.js

A native Web Component for displaying maps using OpenLayers.

// helpers/map.ts
export function startTokenRefresh({ tokenUrl, initialExpiresIn, onTokenUpdate, }) {
    let timer;
    const CHECK_INTERVAL = 30_000;
    const MAX_DRIFT = 60_000;
    let lastChecked = Date.now();
    const scheduleRefresh = async () => {
        try {
            const { token, expiresIn } = await fetchAccessToken(tokenUrl);
            onTokenUpdate(token);
            const refreshDelay = Math.max((expiresIn - 60) * 1000, 10_000);
            timer = setTimeout(scheduleRefresh, refreshDelay);
            lastChecked = Date.now();
        }
        catch (err) {
            console.error('Failed to refresh OS access token:', err);
        }
    };
    const initialDelay = Math.max((initialExpiresIn - 60) * 1000, 10_000);
    timer = setTimeout(scheduleRefresh, initialDelay);
    const detectIdleInterval = setInterval(() => {
        const now = Date.now();
        const drift = now - lastChecked;
        if (drift > CHECK_INTERVAL + MAX_DRIFT) {
            console.warn('[map] Detected system sleep or long pause. Forcing early token refresh.');
            clearTimeout(timer);
            scheduleRefresh();
        }
        lastChecked = now;
    }, CHECK_INTERVAL);
    return () => {
        clearTimeout(timer);
        clearInterval(detectIdleInterval);
    };
}
export async function fetchAccessToken(url) {
    const response = await fetch(url);
    if (!response.ok) {
        throw new Error(`Failed to fetch access token: ${response.statusText}`);
    }
    const { access_token: accessToken, expires_in: initialExpiresIn } = await response.json();
    const expiresIn = Number(initialExpiresIn);
    if (!accessToken || Number.isNaN(expiresIn)) {
        throw new Error(`Invalid access_token or expires_in from token response`);
    }
    return { token: accessToken, expiresIn };
}