1 files changed, 61 insertions, 0 deletions
diff --git a/src/lib/passwordCache.ts b/src/lib/passwordCache.ts
new file mode 100644
index 00000000..4f764698
--- /dev/null
+++ b/src/lib/passwordCache.ts
@@ -0,0 +1,61 @@
+import { browser } from "$app/environment";
+import { writable } from "svelte/store";
+
+const PASSWORD_KEY = "walletPassword";
+const EXPIRES_KEY = "walletPasswordExpiresAt";
+
+export const rememberForOptions = [
+	{ label: "Don't remember", ms: 0 },
+	{ label: "8 hours", ms: 8 * 60 * 60 * 1000 },
+	{ label: "1 day", ms: 24 * 60 * 60 * 1000 },
+	{ label: "1 week", ms: 7 * 24 * 60 * 60 * 1000 },
+	{ label: "1 month", ms: 30 * 24 * 60 * 60 * 1000 },
+	{ label: "1 year", ms: 365 * 24 * 60 * 60 * 1000 },
+];
+
+export const defaultRememberForMs = 30 * 24 * 60 * 60 * 1000;
+
+const clearStoredPassword = () => {
+	if (!browser) return;
+	localStorage.removeItem(PASSWORD_KEY);
+	localStorage.removeItem(EXPIRES_KEY);
+};
+
+const loadStoredPassword = () => {
+	if (!browser) return undefined;
+	const password = localStorage.getItem(PASSWORD_KEY) || undefined;
+	if (!password) return undefined;
+	const expiresAtRaw = localStorage.getItem(EXPIRES_KEY);
+	const expiresAt = expiresAtRaw ? Number(expiresAtRaw) : undefined;
+	if (expiresAt && Date.now() > expiresAt) {
+		clearStoredPassword();
+		return undefined;
+	}
+	return password;
+};
+
+export const walletPassword = writable<string | undefined>(loadStoredPassword());
+
+export const rememberWalletPassword = (password: string, durationMs: number) => {
+	if (!browser) return;
+	if (!durationMs) {
+		clearStoredPassword();
+		walletPassword.set(undefined);
+		return;
+	}
+	const expiresAt = Date.now() + durationMs;
+	localStorage.setItem(PASSWORD_KEY, password);
+	localStorage.setItem(EXPIRES_KEY, String(expiresAt));
+	walletPassword.set(password);
+};
+
+export const forgetWalletPassword = () => {
+	clearStoredPassword();
+	walletPassword.set(undefined);
+};
+
+export const getRememberedWalletPassword = () => {
+	const password = loadStoredPassword();
+	walletPassword.set(password);
+	return password;
+};