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// CDP cannot open a window in another profile, so this goes through the command line: ProcessSingleton hands the argv to the running browser.
// The sentinel must ride on a real `file://` URL — Chrome discards a bare `about:blank#token` argument and opens chrome://newtab instead.
import { spawn, type ChildProcess } from "node:child_process";
import { randomUUID } from "node:crypto";
import { rm, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { pathToFileURL } from "node:url";
import { type Result, err, ok } from "../util/result";
export type ProfileWindowRequest = {
readonly exePath: string;
readonly profileDir: string;
readonly explicitUserDataDir?: string;
};
export type ProfileWindowHandle = {
readonly sentinelUrl: string;
readonly cleanup: () => Promise<void>;
readonly kill: () => void;
};
const SENTINEL_HTML = (token: string): string =>
`<!doctype html><meta charset="utf-8"><title>${token}</title>` +
`<body style="font:14px system-ui;padding:2rem;color:#555">pi browser harness — opening this profile…</body>`;
export const openProfileWindow = async (
req: ProfileWindowRequest,
): Promise<Result<ProfileWindowHandle, string>> => {
const token = `pi-harness-${randomUUID()}`;
const file = join(tmpdir(), `${token}.html`);
try {
await writeFile(file, SENTINEL_HTML(token), "utf8");
} catch (e) {
return err(`could not write the profile handshake page: ${e instanceof Error ? e.message : String(e)}`);
}
const sentinelUrl = pathToFileURL(file).href;
const args: string[] = [];
if (req.explicitUserDataDir) args.push(`--user-data-dir=${req.explicitUserDataDir}`);
args.push(`--profile-directory=${req.profileDir}`, "--new-window", sentinelUrl);
let child: ChildProcess;
try {
child = spawn(req.exePath, args, { detached: true, stdio: "ignore" });
} catch (e) {
await rm(file, { force: true }).catch(() => {});
return err(`could not launch ${req.exePath}: ${e instanceof Error ? e.message : String(e)}`);
}
// spawn() reports a bad binary asynchronously as an 'error' event rather than throwing; unhandled, an ENOENT looked like the 15s sentinel timeout.
const spawnFailure = await new Promise<string | undefined>((resolve) => {
child.once("spawn", () => resolve(undefined));
child.once("error", (e: Error) => resolve(e.message));
});
// A later 'error' event with no listener would throw, so keep one attached for the detached launcher's lifetime.
child.on("error", () => {});
child.unref();
if (spawnFailure) {
await rm(file, { force: true }).catch(() => {});
return err(`could not launch ${req.exePath}: ${spawnFailure}`);
}
let live: ChildProcess | null = child;
return ok({
sentinelUrl,
cleanup: async () => {
await rm(file, { force: true }).catch(() => {});
},
kill: () => {
if (live) {
try { live.kill("SIGTERM"); } catch {}
live = null;
}
},
});
};
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