feat: First iteration, multi themes, I18N

public/js/services/cookies.js

@@ -0,0 +1,21 @@
+// Thin wrapper over document.cookie. Values must already be cookie-safe
+// (see storage.js, which base64url-encodes everything).
+
+const ONE_YEAR = 60 * 60 * 24 * 365;
+
+export function readCookie(name) {
+  const prefix = `${name}=`;
+  for (const part of document.cookie.split('; ')) {
+    if (part.startsWith(prefix)) return part.slice(prefix.length);
+  }
+  return null;
+}
+
+export function writeCookie(name, value) {
+  const secure = location.protocol === 'https:' ? '; Secure' : '';
+  document.cookie = `${name}=${value}; Max-Age=${ONE_YEAR}; Path=/; SameSite=Lax${secure}`;
+}
+
+export function removeCookie(name) {
+  document.cookie = `${name}=; Max-Age=0; Path=/; SameSite=Lax`;
+}