common auth/session bootstrap과 renew policy 공용화

common/core/session/.gitkeep

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common/core/session/index.ts

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+export const DEFAULT_SESSION_RENEW_THRESHOLD_MS = 10 * 60 * 1000;
+export const DEFAULT_SESSION_RENEW_THROTTLE_MS = 30 * 1000;
+
+export type SessionRenewDecisionParams = {
+  expiresAtSec?: number | null;
+  nowMs: number;
+  isEnabled: boolean;
+  isAuthenticated: boolean;
+  isLoading: boolean;
+  isRenewInFlight: boolean;
+  lastAttemptAtMs: number;
+  thresholdMs?: number;
+  throttleMs?: number;
+};
+
+function hasRenewPreconditions({
+  isAuthenticated,
+  isLoading,
+  isRenewInFlight,
+}: SessionRenewDecisionParams) {
+  return isAuthenticated && !isLoading && !isRenewInFlight;
+}
+
+function isRenewWindowOpen({
+  expiresAtSec,
+  nowMs,
+  lastAttemptAtMs,
+  thresholdMs = DEFAULT_SESSION_RENEW_THRESHOLD_MS,
+  throttleMs = DEFAULT_SESSION_RENEW_THROTTLE_MS,
+}: SessionRenewDecisionParams) {
+  if (typeof expiresAtSec !== "number") {
+    return false;
+  }
+
+  const remainingMs = expiresAtSec * 1000 - nowMs;
+  if (remainingMs <= 0 || remainingMs > thresholdMs) {
+    return false;
+  }
+
+  if (nowMs - lastAttemptAtMs < throttleMs) {
+    return false;
+  }
+
+  return true;
+}
+
+export function shouldAttemptSlidingSessionRenew(
+  params: SessionRenewDecisionParams,
+) {
+  if (!params.isEnabled || !hasRenewPreconditions(params)) {
+    return false;
+  }
+
+  return isRenewWindowOpen(params);
+}
+
+export function shouldAttemptUnlimitedSessionRenew(
+  params: SessionRenewDecisionParams,
+) {
+  if (params.isEnabled || !hasRenewPreconditions(params)) {
+    return false;
+  }
+
+  return isRenewWindowOpen(params);
+}