#!/usr/bin/env node
/**
 * 用真实 Chrome 的网络栈发一个请求 (TLS/HTTP2/header 顺序全是浏览器的)
 *
 * 用途: 验证服务端风控是否在按「客户端网络指纹」判定。
 * 从真实验证码域 https://turing.captcha.gtimg.com/ 发起 fetch,
 * Origin/Referer/Sec-Fetch-* 都由浏览器自己填。
 *
 * 用法:
 *   echo '<json body>' | node chrome_fetch.js <url> [originUrl]
 */
const { spawn } = require('child_process');
const fs = require('fs');
const os = require('os');
const path = require('path');

const CHROME = process.env.REA_BROWSER_EXECUTABLE ||
    '/Applications/Google Chrome.app/Contents/MacOS/Google Chrome';

function sleep(ms) { return new Promise(r => setTimeout(r, ms)); }

async function launchChrome() {
    const profile = fs.mkdtempSync(path.join(os.tmpdir(), 'chrome-fetch-'));
    const proc = spawn(CHROME, [
        '--headless=new', '--remote-debugging-port=0', '--no-first-run',
        '--no-default-browser-check', '--disable-gpu', '--disable-dev-shm-usage',
        '--disable-web-security', '--disable-features=IsolateOrigins,site-per-process',
        `--user-data-dir=${profile}`, '--window-size=1280,800', 'about:blank',
    ], { stdio: ['ignore', 'pipe', 'pipe'] });
    const portFile = path.join(profile, 'DevToolsActivePort');
    let port = null;
    for (let i = 0; i < 120; i++) {
        if (fs.existsSync(portFile)) {
            port = parseInt(fs.readFileSync(portFile, 'utf8').split('\n')[0], 10);
            if (port) break;
        }
        await sleep(100);
    }
    if (!port) { proc.kill('SIGKILL'); throw new Error('Chrome 未就绪'); }
    return { proc, port, profile };
}

class Cdp {
    constructor(ws) { this.ws = ws; this.id = 0; this.waits = new Map(); }
    static async connect(url) {
        const ws = new WebSocket(url);
        await new Promise((res, rej) => { ws.onopen = res; ws.onerror = rej; });
        const c = new Cdp(ws);
        ws.onmessage = ev => {
            const m = JSON.parse(ev.data);
            if (m.id && c.waits.has(m.id)) {
                const { res, rej } = c.waits.get(m.id);
                c.waits.delete(m.id);
                m.error ? rej(new Error(JSON.stringify(m.error))) : res(m.result);
            }
        };
        return c;
    }
    send(method, params = {}, sessionId) {
        const id = ++this.id;
        return new Promise((res, rej) => {
            this.waits.set(id, { res, rej });
            this.ws.send(JSON.stringify({ id, method, params, sessionId }));
        });
    }
}

async function main() {
    const url = process.argv[2];
    const origin = process.argv[3] || 'https://turing.captcha.gtimg.com/';
    const body = fs.readFileSync(0, 'utf8').trim();
    const { proc, port, profile } = await launchChrome();
    try {
        const ver = await (await fetch(`http://127.0.0.1:${port}/json/version`)).json();
        const cdp = await Cdp.connect(ver.webSocketDebuggerUrl);
        const { targetId } = await cdp.send('Target.createTarget', { url: origin });
        const { sessionId } = await cdp.send('Target.attachToTarget', { targetId, flatten: true });
        await cdp.send('Page.enable', {}, sessionId);
        await sleep(2500);   // 等页面(真实验证码域)加载完

        const loc = await cdp.send('Runtime.evaluate', { expression: 'location.href', returnByValue: true }, sessionId);
        process.stderr.write('[page] ' + loc.result.value + '\n');
        const expr = `(async () => {
            const r = await fetch(${JSON.stringify(url)}, ${JSON.stringify(body)}
                ? { method: 'POST',
                    headers: { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' },
                    body: ${JSON.stringify(body)}, credentials: 'include' }
                : { method: 'GET', credentials: 'include' });
            const t = await r.text();
            return JSON.stringify({ status: r.status, text: t });
        })()`;
        const out = await cdp.send('Runtime.evaluate',
            { expression: expr, awaitPromise: true, returnByValue: true }, sessionId);
        if (out.exceptionDetails) {
            console.log(JSON.stringify({ _exception: out.exceptionDetails.text,
                desc: (out.exceptionDetails.exception || {}).description }));
        } else if (out.result && out.result.value !== undefined) {
            console.log(out.result.value);
        } else {
            console.log(JSON.stringify({ _raw: out }));
        }
        cdp.ws.close();
    } finally {
        proc.kill('SIGKILL');
        try { fs.rmSync(profile, { recursive: true, force: true }); } catch (_) {}
    }
}

main().catch(e => { console.error('ERR', e.message); process.exit(1); });