@aws-amplify/auth/dist/esm/providers/cognito/utils/oauth/inflightPromise.mjs

Auth category of aws-amplify

// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
const inflightPromises = [];
// Module-level singleton backstop timer for the inflight OAuth blocking
// deadline. A single timer (not one per waiter) is sufficient because all
// parked waiters share one release (`resolveAndClearInflightPromises` drains
// them all), and every park re-arms it with the current deadline.
let deadlineTimer;
const addInflightPromise = (resolver) => {
    inflightPromises.push(resolver);
};
/**
 * Arms (or re-arms) the backstop timer that releases parked token consumers
 * once the inflight OAuth blocking deadline passes.
 *
 * On fire it re-reads the deadline instead of trusting the armed one: a fresh
 * `signInWithRedirect` may have renewed it (re-arm for the new deadline), or
 * the flow may have been released through another path already (the re-check
 * returns `undefined` and draining is a no-op). The release is purely local —
 * it never mutates shared OAuth state, so another tab's still-running flow is
 * left intact.
 *
 * Note: browsers throttle timers in background tabs, which may delay (never
 * prevent) this release; the cross-tab storage listener remains the fast path.
 */
const armInflightDeadline = (deadline, recheckDeadline) => {
    if (deadlineTimer !== undefined) {
        clearTimeout(deadlineTimer);
    }
    deadlineTimer = setTimeout(() => {
        deadlineTimer = undefined;
        recheckDeadline()
            .then(renewedDeadline => {
            if (renewedDeadline !== undefined) {
                armInflightDeadline(renewedDeadline, recheckDeadline);
                return;
            }
            resolveAndClearInflightPromises();
        })
            // Fail open: an error while re-checking (e.g. auth config torn down)
            // must release the waiters rather than leave them parked forever.
            .catch(() => {
            resolveAndClearInflightPromises();
        });
    }, Math.max(0, deadline - Date.now()));
};
const resolveAndClearInflightPromises = () => {
    // The waiters this timer guarded are being released through this very call
    // (whatever triggered it) — clear it so no stale timer outlives its waiters.
    if (deadlineTimer !== undefined) {
        clearTimeout(deadlineTimer);
        deadlineTimer = undefined;
    }
    while (inflightPromises.length) {
        inflightPromises.pop()?.();
    }
};

export { addInflightPromise, armInflightDeadline, resolveAndClearInflightPromises };
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