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declare const WXT_GOOGLE_OAUTH_CLIENT_ID: string;
/**
* Google sign-in via chrome.identity.launchWebAuthFlow running an OIDC
* implicit id_token flow (research.md R1 — getAuthToken returns an access
* token, which the server-side JWKS verification cannot accept).
*
* The session lives in chrome.storage.local so it survives browser restarts;
* silent renewal (interactive:false) keeps it alive for up to ~30 days from
* the interactive sign-in (FR-014a). The client only *decodes* the token for
* display/expiry — verification is exclusively server-side (FR-003).
*/
export const AUTH_SESSION_KEY = "auth:session";
export const NOT_AUTHORIZED_KEY = "auth:notAuthorized";
/** ~30 days: past this, silent renewal stops and interactive sign-in is required. */
export const SESSION_HORIZON_MS = 30 * 24 * 60 * 60 * 1000;
const AUTH_ENDPOINT = "https://accounts.google.com/o/oauth2/v2/auth";
/** Renew slightly before exp so in-flight requests don't race expiry. */
const EXPIRY_SKEW_MS = 60_000;
interface IdTokenClaims {
sub: string;
email: string;
exp: number;
nonce?: string;
}
function decodeIdToken(idToken: string): IdTokenClaims {
const parts = idToken.split(".");
if (parts.length !== 3) throw new Error("Malformed ID token");
const payloadJson = atob(parts[1].replace(/-/g, "+").replace(/_/g, "/"));
const claims = JSON.parse(payloadJson) as Partial<IdTokenClaims>;
if (
typeof claims.sub !== "string" ||
typeof claims.email !== "string" ||
typeof claims.exp !== "number"
) {
throw new Error("ID token is missing required claims");
}
return claims as IdTokenClaims;
}
function freshNonce(): string {
const bytes = new Uint8Array(16);
crypto.getRandomValues(bytes);
return [...bytes].map((b) => b.toString(16).padStart(2, "0")).join("");
}
function buildAuthUrl(nonce: string, options: { loginHint?: string; silent?: boolean }): string {
const url = new URL(AUTH_ENDPOINT);
url.searchParams.set("client_id", WXT_GOOGLE_OAUTH_CLIENT_ID);
url.searchParams.set("response_type", "id_token");
url.searchParams.set("redirect_uri", chrome.identity.getRedirectURL());
url.searchParams.set("scope", "openid email");
url.searchParams.set("nonce", nonce);
if (options.silent) {
url.searchParams.set("prompt", "none");
}
if (options.loginHint) {
url.searchParams.set("login_hint", options.loginHint);
}
return url.toString();
}
function extractIdToken(redirectUrl: string, expectedNonce: string): string {
const hash = new URL(redirectUrl).hash.replace(/^#/, "");
const idToken = new URLSearchParams(hash).get("id_token");
if (!idToken) {
throw new AuthError("sign-in-failed", "Google did not return an ID token.");
}
const claims = decodeIdToken(idToken);
if (claims.nonce !== expectedNonce) {
throw new AuthError("sign-in-failed", "Sign-in response failed the nonce check.");
}
return idToken;
}
async function runAuthFlow(options: {
interactive: boolean;
loginHint?: string;
}): Promise<{ idToken: string; user: AuthenticatedUser; expiresAt: number }> {
const nonce = freshNonce();
const url = buildAuthUrl(nonce, {
loginHint: options.loginHint,
silent: !options.interactive,
});
const redirectUrl = await chrome.identity.launchWebAuthFlow({
url,
interactive: options.interactive,
});
if (!redirectUrl) {
throw new AuthError("sign-in-canceled", "Sign-in was canceled.");
}
const idToken = extractIdToken(redirectUrl, nonce);
const claims = decodeIdToken(idToken);
return {
idToken,
user: { sub: claims.sub, email: claims.email },
expiresAt: claims.exp * 1000,
};
}
async function persist(auth: StoredAuth): Promise<void> {
await chrome.storage.local.set({ [AUTH_SESSION_KEY]: auth });
}
export async function getStoredAuth(): Promise<StoredAuth | null> {
const data = await chrome.storage.local.get(AUTH_SESSION_KEY);
return (data[AUTH_SESSION_KEY] as StoredAuth | undefined) ?? null;
}
/** Interactive sign-in: anchors a new ~30-day session (sets signedInAt). */
export async function signIn(): Promise<StoredAuth> {
let result;
try {
result = await runAuthFlow({ interactive: true });
} catch (err) {
if (err instanceof AuthError) throw err;
throw new AuthError("sign-in-canceled", "Sign-in was canceled.");
}
const auth: StoredAuth = { ...result, signedInAt: Date.now() };
await chrome.storage.local.remove(NOT_AUTHORIZED_KEY);
await persist(auth);
return auth;
}
/**
* Non-interactive renewal. Never throws: returns null when there is no
* session, the ~30-day horizon has passed (FR-014a), or Google refuses the
* silent flow — callers fall back to the sign-in gate.
*/
export async function signInSilently(): Promise<StoredAuth | null> {
const stored = await getStoredAuth();
if (!stored) return null;
if (Date.now() - stored.signedInAt > SESSION_HORIZON_MS) return null;
try {
const result = await runAuthFlow({
interactive: false,
loginHint: stored.user.email,
});
const auth: StoredAuth = { ...result, signedInAt: stored.signedInAt };
await persist(auth);
return auth;
} catch {
return null;
}
}
/** Fresh Bearer token for a request, renewing silently when needed. */
export async function getIdToken(): Promise<string | null> {
const stored = await getStoredAuth();
if (stored && stored.expiresAt - EXPIRY_SKEW_MS > Date.now()) {
return stored.idToken;
}
const renewed = await signInSilently();
return renewed?.idToken ?? null;
}
export async function signOut(): Promise<void> {
await chrome.storage.local.remove([AUTH_SESSION_KEY, NOT_AUTHORIZED_KEY]);
}
/** Server said 403: end the session and remember the invitation state. */
export async function markNotAuthorized(): Promise<void> {
await chrome.storage.local.remove(AUTH_SESSION_KEY);
await chrome.storage.local.set({ [NOT_AUTHORIZED_KEY]: true });
}
export async function isNotAuthorized(): Promise<boolean> {
const data = await chrome.storage.local.get(NOT_AUTHORIZED_KEY);
return data[NOT_AUTHORIZED_KEY] === true;
}
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