첫 커밋: 로컬 프로젝트 업로드

baron-sso/common/core/session/index.ts

@@ -0,0 +1,114 @@
+export const DEFAULT_SESSION_RENEW_THRESHOLD_MS = 10 * 60 * 1000;
+export const DEFAULT_SESSION_RENEW_THROTTLE_MS = 30 * 1000;
+export const SESSION_EXPIRY_STORAGE_KEY = "baron_session_expiry_enabled";
+
+type SessionExpiryReadableStorage = Pick<Storage, "getItem">;
+type SessionExpiryWritableStorage = Pick<Storage, "setItem">;
+
+export type SessionRenewDecisionParams = {
+  expiresAtSec?: number | null;
+  nowMs: number;
+  isEnabled: boolean;
+  isAuthenticated: boolean;
+  isLoading: boolean;
+  isRenewInFlight: boolean;
+  lastAttemptAtMs: number;
+  thresholdMs?: number;
+  throttleMs?: number;
+};
+
+export type SessionExpiryPreferenceParams = {
+  defaultEnabled?: boolean;
+  storage?: SessionExpiryReadableStorage | null;
+};
+
+export type DevelopmentSessionRedirectParams = {
+  appMode: string;
+  defaultEnabled?: boolean;
+  storage?: SessionExpiryReadableStorage | null;
+};
+
+function browserStorage() {
+  if (typeof window === "undefined") {
+    return null;
+  }
+
+  return window.localStorage;
+}
+
+export function readSessionExpiryEnabled({
+  defaultEnabled = true,
+  storage = browserStorage(),
+}: SessionExpiryPreferenceParams = {}) {
+  const stored = storage?.getItem(SESSION_EXPIRY_STORAGE_KEY) ?? null;
+  return stored === null ? defaultEnabled : stored !== "false";
+}
+
+export function writeSessionExpiryEnabled(
+  isEnabled: boolean,
+  storage: SessionExpiryWritableStorage | null = browserStorage(),
+) {
+  storage?.setItem(SESSION_EXPIRY_STORAGE_KEY, String(isEnabled));
+}
+
+export function shouldSuppressDevelopmentSessionRedirect({
+  appMode,
+  defaultEnabled = appMode !== "development",
+  storage = browserStorage(),
+}: DevelopmentSessionRedirectParams) {
+  return (
+    appMode === "development" &&
+    !readSessionExpiryEnabled({ defaultEnabled, storage })
+  );
+}
+
+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);
+}