import { createHash, randomBytes } from "node:crypto";
import { readFileSync } from "node:fs";
import { createServer } from "node:http";
// OAuth constants - decoded from pi-ai's base64 encoded values to stay in sync
const decode = (s: string) => Buffer.from(s, "base64").toString();
const CLIENT_ID = decode(
"MTA3MTAwNjA2MDU5MS10bWhzc2luMmgyMWxjcmUyMzV2dG9sb2poNGc0MDNlcC5hcHBzLmdvb2dsZXVzZXJjb250ZW50LmNvbQ==",
);
const CLIENT_SECRET = decode("R09DU1BYLUs1OEZXUjQ4NkxkTEoxbUxCOHNYQzR6NnFEQWY=");
const REDIRECT_URI = "http://localhost:51121/oauth-callback";
const AUTH_URL = "https://accounts.google.com/o/oauth2/v2/auth";
const TOKEN_URL = "https://oauth2.googleapis.com/token";
const DEFAULT_PROJECT_ID = "rising-fact-p41fc";
const DEFAULT_MODEL = "google-antigravity/claude-opus-4-5-thinking";
const SCOPES = [
"https://www.googleapis.com/auth/cloud-platform",
"https://www.googleapis.com/auth/userinfo.email",
"https://www.googleapis.com/auth/userinfo.profile",
"https://www.googleapis.com/auth/cclog",
"https://www.googleapis.com/auth/experimentsandconfigs",
];
const CODE_ASSIST_ENDPOINTS = [
"https://cloudcode-pa.googleapis.com",
"https://daily-cloudcode-pa.sandbox.googleapis.com",
];
const RESPONSE_PAGE = `
Clawdbot Antigravity OAuth
Authentication complete
You can return to the terminal.
`;
function generatePkce(): { verifier: string; challenge: string } {
const verifier = randomBytes(32).toString("hex");
const challenge = createHash("sha256").update(verifier).digest("base64url");
return { verifier, challenge };
}
function isWSL(): boolean {
if (process.platform !== "linux") return false;
try {
const release = readFileSync("/proc/version", "utf8").toLowerCase();
return release.includes("microsoft") || release.includes("wsl");
} catch {
return false;
}
}
function isWSL2(): boolean {
if (!isWSL()) return false;
try {
const version = readFileSync("/proc/version", "utf8").toLowerCase();
return version.includes("wsl2") || version.includes("microsoft-standard");
} catch {
return false;
}
}
function shouldUseManualOAuthFlow(isRemote: boolean): boolean {
return isRemote || isWSL2();
}
function buildAuthUrl(params: { challenge: string; state: string }): string {
const url = new URL(AUTH_URL);
url.searchParams.set("client_id", CLIENT_ID);
url.searchParams.set("response_type", "code");
url.searchParams.set("redirect_uri", REDIRECT_URI);
url.searchParams.set("scope", SCOPES.join(" "));
url.searchParams.set("code_challenge", params.challenge);
url.searchParams.set("code_challenge_method", "S256");
url.searchParams.set("state", params.state);
url.searchParams.set("access_type", "offline");
url.searchParams.set("prompt", "consent");
return url.toString();
}
function parseCallbackInput(
input: string,
): { code: string; state: string } | { error: string } {
const trimmed = input.trim();
if (!trimmed) return { error: "No input provided" };
try {
const url = new URL(trimmed);
const code = url.searchParams.get("code");
const state = url.searchParams.get("state");
if (!code) return { error: "Missing 'code' parameter in URL" };
if (!state) return { error: "Missing 'state' parameter in URL" };
return { code, state };
} catch {
return { error: "Paste the full redirect URL (not just the code)." };
}
}
async function startCallbackServer(params: { timeoutMs: number }) {
const redirect = new URL(REDIRECT_URI);
const port = redirect.port ? Number(redirect.port) : 51121;
let settled = false;
let resolveCallback: (url: URL) => void;
let rejectCallback: (err: Error) => void;
const callbackPromise = new Promise((resolve, reject) => {
resolveCallback = (url) => {
if (settled) return;
settled = true;
resolve(url);
};
rejectCallback = (err) => {
if (settled) return;
settled = true;
reject(err);
};
});
const timeout = setTimeout(() => {
rejectCallback(new Error("Timed out waiting for OAuth callback"));
}, params.timeoutMs);
timeout.unref?.();
const server = createServer((request, response) => {
if (!request.url) {
response.writeHead(400, { "Content-Type": "text/plain" });
response.end("Missing URL");
return;
}
const url = new URL(request.url, `${redirect.protocol}//${redirect.host}`);
if (url.pathname !== redirect.pathname) {
response.writeHead(404, { "Content-Type": "text/plain" });
response.end("Not found");
return;
}
response.writeHead(200, { "Content-Type": "text/html; charset=utf-8" });
response.end(RESPONSE_PAGE);
resolveCallback(url);
setImmediate(() => {
server.close();
});
});
await new Promise((resolve, reject) => {
const onError = (err: Error) => {
server.off("error", onError);
reject(err);
};
server.once("error", onError);
server.listen(port, "127.0.0.1", () => {
server.off("error", onError);
resolve();
});
});
return {
waitForCallback: () => callbackPromise,
close: () =>
new Promise((resolve) => {
server.close(() => resolve());
}),
};
}
async function exchangeCode(params: {
code: string;
verifier: string;
}): Promise<{ access: string; refresh: string; expires: number }> {
const response = await fetch(TOKEN_URL, {
method: "POST",
headers: { "Content-Type": "application/x-www-form-urlencoded" },
body: new URLSearchParams({
client_id: CLIENT_ID,
client_secret: CLIENT_SECRET,
code: params.code,
grant_type: "authorization_code",
redirect_uri: REDIRECT_URI,
code_verifier: params.verifier,
}),
});
if (!response.ok) {
const text = await response.text();
throw new Error(`Token exchange failed: ${text}`);
}
const data = (await response.json()) as {
access_token?: string;
refresh_token?: string;
expires_in?: number;
};
const access = data.access_token?.trim();
const refresh = data.refresh_token?.trim();
const expiresIn = data.expires_in ?? 0;
if (!access) throw new Error("Token exchange returned no access_token");
if (!refresh) throw new Error("Token exchange returned no refresh_token");
const expires = Date.now() + expiresIn * 1000 - 5 * 60 * 1000;
return { access, refresh, expires };
}
async function fetchUserEmail(accessToken: string): Promise {
try {
const response = await fetch("https://www.googleapis.com/oauth2/v1/userinfo?alt=json", {
headers: { Authorization: `Bearer ${accessToken}` },
});
if (!response.ok) return undefined;
const data = (await response.json()) as { email?: string };
return data.email;
} catch {
return undefined;
}
}
async function fetchProjectId(accessToken: string): Promise {
const headers = {
Authorization: `Bearer ${accessToken}`,
"Content-Type": "application/json",
"User-Agent": "google-api-nodejs-client/9.15.1",
"X-Goog-Api-Client": "google-cloud-sdk vscode_cloudshelleditor/0.1",
"Client-Metadata": JSON.stringify({
ideType: "IDE_UNSPECIFIED",
platform: "PLATFORM_UNSPECIFIED",
pluginType: "GEMINI",
}),
};
for (const endpoint of CODE_ASSIST_ENDPOINTS) {
try {
const response = await fetch(`${endpoint}/v1internal:loadCodeAssist`, {
method: "POST",
headers,
body: JSON.stringify({
metadata: {
ideType: "IDE_UNSPECIFIED",
platform: "PLATFORM_UNSPECIFIED",
pluginType: "GEMINI",
},
}),
});
if (!response.ok) continue;
const data = (await response.json()) as {
cloudaicompanionProject?: string | { id?: string };
};
if (typeof data.cloudaicompanionProject === "string") {
return data.cloudaicompanionProject;
}
if (
data.cloudaicompanionProject &&
typeof data.cloudaicompanionProject === "object" &&
data.cloudaicompanionProject.id
) {
return data.cloudaicompanionProject.id;
}
} catch {
// ignore
}
}
return DEFAULT_PROJECT_ID;
}
async function loginAntigravity(params: {
isRemote: boolean;
openUrl: (url: string) => Promise;
prompt: (message: string) => Promise;
note: (message: string, title?: string) => Promise;
progress: { update: (msg: string) => void; stop: (msg?: string) => void };
}): Promise<{
access: string;
refresh: string;
expires: number;
email?: string;
projectId: string;
}> {
const { verifier, challenge } = generatePkce();
const state = randomBytes(16).toString("hex");
const authUrl = buildAuthUrl({ challenge, state });
let callbackServer: Awaited> | null = null;
const needsManual = shouldUseManualOAuthFlow(params.isRemote);
if (!needsManual) {
try {
callbackServer = await startCallbackServer({ timeoutMs: 5 * 60 * 1000 });
} catch {
callbackServer = null;
}
}
if (!callbackServer) {
await params.note(
[
"Open the URL in your local browser.",
"After signing in, copy the full redirect URL and paste it back here.",
"",
`Auth URL: ${authUrl}`,
`Redirect URI: ${REDIRECT_URI}`,
].join("\n"),
"Google Antigravity OAuth",
);
}
if (!needsManual) {
params.progress.update("Opening Google sign-in…");
try {
await params.openUrl(authUrl);
} catch {
// ignore
}
}
let code = "";
let returnedState = "";
if (callbackServer) {
params.progress.update("Waiting for OAuth callback…");
const callback = await callbackServer.waitForCallback();
code = callback.searchParams.get("code") ?? "";
returnedState = callback.searchParams.get("state") ?? "";
await callbackServer.close();
} else {
params.progress.update("Waiting for redirect URL…");
const input = await params.prompt("Paste the redirect URL: ");
const parsed = parseCallbackInput(input);
if ("error" in parsed) throw new Error(parsed.error);
code = parsed.code;
returnedState = parsed.state;
}
if (!code) throw new Error("Missing OAuth code");
if (returnedState !== state) {
throw new Error("OAuth state mismatch. Please try again.");
}
params.progress.update("Exchanging code for tokens…");
const tokens = await exchangeCode({ code, verifier });
const email = await fetchUserEmail(tokens.access);
const projectId = await fetchProjectId(tokens.access);
params.progress.stop("Antigravity OAuth complete");
return { ...tokens, email, projectId };
}
const antigravityPlugin = {
id: "google-antigravity-auth",
name: "Google Antigravity Auth",
description: "OAuth flow for Google Antigravity (Cloud Code Assist)",
register(api) {
api.registerProvider({
id: "google-antigravity",
label: "Google Antigravity",
docsPath: "/providers/models",
aliases: ["antigravity"],
auth: [
{
id: "oauth",
label: "Google OAuth",
hint: "PKCE + localhost callback",
kind: "oauth",
run: async (ctx) => {
const spin = ctx.prompter.progress("Starting Antigravity OAuth…");
try {
const result = await loginAntigravity({
isRemote: ctx.isRemote,
openUrl: ctx.openUrl,
prompt: async (message) => String(await ctx.prompter.text({ message })),
note: ctx.prompter.note,
progress: spin,
});
const profileId = `google-antigravity:${result.email ?? "default"}`;
return {
profiles: [
{
profileId,
credential: {
type: "oauth",
provider: "google-antigravity",
access: result.access,
refresh: result.refresh,
expires: result.expires,
email: result.email,
projectId: result.projectId,
},
},
],
configPatch: {
agents: {
defaults: {
models: {
[DEFAULT_MODEL]: {},
},
},
},
},
defaultModel: DEFAULT_MODEL,
notes: [
"Antigravity uses Google Cloud project quotas.",
"Enable Gemini for Google Cloud on your project if requests fail.",
],
};
} catch (err) {
spin.stop("Antigravity OAuth failed");
throw err;
}
},
},
],
});
},
};
export default antigravityPlugin;