Function beginGithubLogin

loop-library/site/script.js:649–673

(link)

  bytes.forEach((byte) => { binary += String.fromCharCode(byte); });
  return window.btoa(binary)
    .replace(/\+/g, "-")
    .replace(/\//g, "_")
    .replace(/=+$/, "");
}

async function beginGithubLogin(link) {
  const nonce = oauthNonce();
  try {
    window.sessionStorage.setItem(OAUTH_NONCE_KEY, nonce);
    const url = new URL(link.href, window.location.href);
    url.searchParams.set("client_nonce", nonce);
    const response = await fetch(url, {
      credentials: "same-origin",
      headers: { Accept: "application/json" },
    });
    const body = await response.json();
    if (!response.ok || !body.authorizationUrl) {
      throw new Error(body.error || "GitHub sign-in is unavailable.");
    }
    window.location.assign(body.authorizationUrl);
  } catch (error) {
    try {
      window.sessionStorage.removeItem(OAUTH_NONCE_KEY);
    } catch {
      // Storage may be unavailable in hardened browser modes.
    }
    link.removeAttribute("aria-disabled");
    showToast(error.message || "GitHub sign-in is unavailable.");