js agent
This commit is contained in:
parent
e3995c1926
commit
a46881fcbe
184
agent/index.js
Normal file
184
agent/index.js
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@ -0,0 +1,184 @@
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import { nanoid } from "nanoid";
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// import { WebSocketServer } from "ws";
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import { execFile as _execFile, spawn } from "node:child_process";
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import { open, readFile, rm } from "node:fs/promises";
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import { createServer } from "node:http";
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import { tmpdir } from "node:os";
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import { join } from "node:path";
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import { promisify } from "node:util";
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const execFile = promisify(_execFile);
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// const spawn = promisify(_spawn);
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const secret = await parseSecret();
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// const wsServer = new WebSocketServer({ noServer: true });
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const server = createServer(async (req, res) => {
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try {
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await handler(req, res);
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} catch (error) {
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console.error("Error manejando", req.url, error);
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res.destroy();
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}
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});
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/** @type {Map<string, {listeners: ((data: Buffer | null) => void)[], prev: Buffer, statusCode: null | number}>} */
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let runs = new Map();
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// server.on("upgrade", (req, socket, head) => {
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// const url = getUrl(req)
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// let matches;
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// if ((matches = url.pathname.match(runWebSocketRegexp))) {
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// const runId = matches[1];
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// if (!listeners.has(runId)) {
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// return
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// }
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// wsServer.handleUpgrade(req, socket,head,(client,request)=>{
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// })
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// }
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// });
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/**
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* @param {string} runId
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* @param {Buffer} chunk
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*/
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function writeToRun(runId, chunk) {
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const run = runs.get(runId);
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if (!run) throw new Error(`runId ${runId} doesn't exist`);
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run.prev = Buffer.concat([run.prev, chunk]);
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for (const listener of run.listeners) {
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listener(chunk);
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}
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}
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/**
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* @param {string} runId
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*/
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function closeRun(runId) {
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const run = runs.get(runId);
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if (!run) throw new Error(`runId ${runId} doesn't exist`);
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for (const listener of run.listeners) {
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listener(null);
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}
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}
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const runWebSocketRegexp = /^\/run\/(.+)$/;
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/**
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* @param {import("http").IncomingMessage} req
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* @param {import("http").ServerResponse<import("http").IncomingMessage> & { req: import("http").IncomingMessage; }} res
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*/
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async function handler(req, res) {
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// prettier-ignore
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const url = getUrl(req);
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auth(secret, req, res);
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let matches;
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if (url.pathname === "/hello") {
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if (req.method === "GET") {
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return res.writeHead(200).end("Ey!");
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} else return res.writeHead(405).end("method not allowed");
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} else if (url.pathname === "/run") {
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if (req.method === "POST") {
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const runId = nanoid();
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runs.set(runId, {
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listeners: [],
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prev: Buffer.from([]),
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statusCode: null,
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});
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const execPath = join(tmpdir(), "fireactions-agent-exec-" + nanoid());
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{
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const execFile = await open(execPath, "w", 0o700);
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await new Promise((resolve, reject) =>
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req.pipe(execFile.createWriteStream()).addListener("finish", () => {
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resolve(void 0);
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})
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);
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}
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const proc = spawn(execPath, [], {});
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proc.stdout.on("data", async (/** @type {Buffer} */ chunk) => {
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writeToRun(runId, chunk);
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});
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proc.stderr.on("data", async (/** @type {Buffer} */ chunk) => {
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writeToRun(runId, chunk);
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});
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proc.on("close", async (code) => {
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const run = runs.get(runId);
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if (!run) return panic();
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runs.set(runId, { ...run, statusCode: code });
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closeRun(runId);
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await rm(execPath);
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});
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return res.writeHead(200).end(JSON.stringify({ runId }));
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} else return res.writeHead(405).end("method not allowed");
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} else if ((matches = url.pathname.match(runWebSocketRegexp))) {
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const runId = matches[1];
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const run = runs.get(runId);
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if (!run) {
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return res.writeHead(404).end("run not found");
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}
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res.writeHead(200, {
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"content-type": "text/event-stream",
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Connection: "keep-alive",
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"Cache-Control": "no-cache",
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"Access-Control-Allow-Origin": "*",
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});
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const listener = (/** @type {Buffer | null} */ data) => {
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if (data === null) return res.end();
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res.write(
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"event: stdsmth\n" + `data: ${JSON.stringify(data.toString())}\n\n`
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);
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};
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listener(run.prev);
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// TODO: remove listener when request closed
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runs.set(runId, { ...run, listeners: [...run.listeners, listener] });
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} else {
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return res.writeHead(404).end("not found");
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}
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}
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/**
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* @param {import("http").IncomingMessage} req
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*/
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function getUrl(req) {
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// prettier-ignore
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const urlString = /** @type {string} */(req.url);
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const url = new URL(urlString, `http://${req.headers.host}`);
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return url;
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}
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/**
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* @returns {Promise<string>}
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*/
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async function parseSecret() {
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const cmdline = await readFile("/proc/cmdline", "utf-8");
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for (const opt of cmdline.split(" ")) {
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const [key, value] = opt.split("=");
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if (key === "fireactions.secret") {
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if (value.length < 5) throw new Error("valor muy corto");
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return value;
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}
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}
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throw new Error("no hay secreto");
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}
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/**
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* @param {string} secret
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* @param {import("http").IncomingMessage} req
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* @param {import("http").ServerResponse<import("http").IncomingMessage> & { req: import("http").IncomingMessage; }} res
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*/
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function auth(secret, req, res) {
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const url = getUrl(req);
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const auth = req.headers.authorization
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? req.headers.authorization.slice("Bearer ".length)
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: url.searchParams.get("token");
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if (auth !== secret) {
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res.writeHead(401).end("wrong secret");
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throw new Error("unauthorized");
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}
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}
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server.listen("8080");
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function panic() {
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throw new Error("Function not implemented.");
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}
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261
agent/main.go
261
agent/main.go
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package main
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import (
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"errors"
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"io"
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"io/ioutil"
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"log"
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"net/http"
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"os"
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"os/exec"
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"strings"
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"sync"
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"github.com/jaevor/go-nanoid"
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"github.com/labstack/echo/v4"
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"github.com/labstack/echo/v4/middleware"
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gommon "github.com/labstack/gommon/log"
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"golang.org/x/net/websocket"
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)
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func main() {
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sec, err := parseSecret()
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if err != nil {
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panic(err)
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}
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e := echo.New()
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e.Use(middleware.Logger())
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e.Use(middleware.RecoverWithConfig(middleware.RecoverConfig{
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Skipper: middleware.DefaultSkipper,
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LogLevel: gommon.ERROR,
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}))
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au := auth{secret: sec}
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e.GET("/hello", hello)
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e.POST("/run", runHandler, au.headerMiddleware)
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e.GET("/run/:id", runLogHandler, au.queryMiddleware)
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e.Logger.Fatal(e.Start(":8080"))
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}
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func hello(c echo.Context) error {
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return c.String(http.StatusOK, "Hello, World!")
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}
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type runResp struct {
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RunId string
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}
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type run struct {
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mutex sync.Mutex
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clients []client
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prev []byte
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msgChan chan []byte
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}
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func newRun() *run {
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r := &run{
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msgChan: make(chan []byte),
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}
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go r.pump()
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return r
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}
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func (r *run) newClient(ws *websocket.Conn) {
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cl := client{conn: ws, msgChan: make(chan []byte)}
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prev := func() []byte {
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r.mutex.Lock()
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defer r.mutex.Unlock()
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r.clients = append(r.clients, cl)
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return r.prev
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}()
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cl.pump(prev)
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}
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func (r *run) pump() {
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for {
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select {
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case msg, ok := <-r.msgChan:
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func() {
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r.mutex.Lock()
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defer r.mutex.Unlock()
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if !ok {
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for _, c := range r.clients {
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close(c.msgChan)
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}
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return
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}
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r.prev = append(r.prev, msg...)
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for _, c := range r.clients {
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c.msgChan <- msg
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}
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}()
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if !ok {
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return
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}
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}
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}
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}
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// Write implements io.Writer
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func (r *run) Write(p []byte) (n int, err error) {
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r.msgChan <- p
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return len(p), nil
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}
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// Close implements io.Closer
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func (r *run) Close() error {
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close(r.msgChan)
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return nil
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}
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type client struct {
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conn *websocket.Conn
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msgChan chan []byte
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}
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func (c *client) pump(prev []byte) {
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_, err := c.conn.Write(prev)
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if err != nil {
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close(c.msgChan)
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return
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}
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for {
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select {
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case msg, ok := <-c.msgChan:
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if !ok {
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return
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}
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_, err := c.conn.Write(msg)
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if err != nil {
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close(c.msgChan)
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return
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}
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}
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}
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}
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var runs = struct {
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runs map[string]*run
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sync.Mutex
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}{runs: make(map[string]*run)}
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func runHandler(c echo.Context) error {
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f, err := os.CreateTemp("", "fireactions-agent-*")
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if err != nil {
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log.Panicln(err)
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}
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if _, err = io.Copy(f, c.Request().Body); err != nil {
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log.Panicln(err)
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}
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if err = f.Close(); err != nil {
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log.Panicln(err)
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}
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if err = os.Chmod(f.Name(), 0700); err != nil {
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log.Panicln(err)
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}
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nanid, err := nanoid.Standard(21)
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if err != nil {
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log.Panicln(err)
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}
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id := nanid()
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run := newRun()
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func() {
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runs.Lock()
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defer runs.Unlock()
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runs.runs[id] = run
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}()
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cmd := exec.Command(f.Name())
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cmd.Stdout = run
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cmd.Stderr = run
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err = cmd.Start()
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go func() {
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defer run.Close()
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err := cmd.Wait()
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if err != nil {
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log.Println(err)
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}
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}()
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if err != nil {
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log.Println(err)
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return c.String(http.StatusInternalServerError, "error running command")
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}
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return c.JSON(http.StatusOK, runResp{
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RunId: id,
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})
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}
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func runLogHandler(c echo.Context) error {
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id := c.Param("id")
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r, exists := func() (*run, bool) {
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runs.Lock()
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defer runs.Unlock()
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r, ok := runs.runs[id]
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return r, ok
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}()
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if !exists {
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return c.String(http.StatusNotFound, "run not found")
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}
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websocket.Handler(func(ws *websocket.Conn) {
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r.newClient(ws)
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}).ServeHTTP(c.Response(), c.Request())
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return nil
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}
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type auth struct {
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secret string
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}
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func (a auth) headerMiddleware(next echo.HandlerFunc) echo.HandlerFunc {
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return func(c echo.Context) error {
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s := strings.Split(c.Request().Header.Get("Authorization"), " ")
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if len(s) < 2 {
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return c.String(http.StatusBadRequest, "fuck no")
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}
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sec := s[1]
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log.Println(len(sec), len(a.secret))
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if sec == a.secret {
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return next(c)
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} else {
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return c.String(http.StatusUnauthorized, "wrong secret")
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}
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}
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}
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func (a auth) queryMiddleware(next echo.HandlerFunc) echo.HandlerFunc {
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return func(c echo.Context) error {
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sec := c.Request().URL.Query().Get("token")
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if sec == a.secret {
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return next(c)
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} else {
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return c.String(http.StatusUnauthorized, "wrong secret")
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}
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}
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}
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func parseSecret() (string, error) {
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byt, err := ioutil.ReadFile("/proc/cmdline")
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if err != nil {
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return "", err
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}
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opts := strings.Split(string(byt), " ")
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for _, opt := range opts {
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s := strings.Split(opt, "=")
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if len(s) != 2 {
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continue
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}
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key := s[0]
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val := s[1]
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if key == "fireactions.secret" {
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if len(val) < 5 {
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return "", errors.New("secret too short")
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}
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return val, nil
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}
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}
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return "", errors.New("no secret in cmdline")
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}
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22
agent/package.json
Normal file
22
agent/package.json
Normal file
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@ -0,0 +1,22 @@
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{
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"name": "agent",
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"type": "module",
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"version": "1.0.0",
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"description": "",
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"main": "index.js",
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"scripts": {
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"test": "echo \"Error: no test specified\" && exit 1"
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},
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"keywords": [],
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"author": "",
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"license": "ISC",
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"devDependencies": {
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"@tsconfig/node16": "^1.0.4",
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"@types/node": "^20.2.5",
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"@types/ws": "^8.5.4"
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},
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"dependencies": {
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"nanoid": "^4.0.2",
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"ws": "^8.13.0"
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}
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}
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59
agent/pnpm-lock.yaml
Normal file
59
agent/pnpm-lock.yaml
Normal file
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lockfileVersion: '6.1'
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settings:
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autoInstallPeers: true
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excludeLinksFromLockfile: false
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dependencies:
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nanoid:
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specifier: ^4.0.2
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version: 4.0.2
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ws:
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specifier: ^8.13.0
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version: 8.13.0
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devDependencies:
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'@tsconfig/node16':
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specifier: ^1.0.4
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version: 1.0.4
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'@types/node':
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specifier: ^20.2.5
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version: 20.2.5
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'@types/ws':
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specifier: ^8.5.4
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version: 8.5.4
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packages:
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/@tsconfig/node16@1.0.4:
|
||||
resolution: {integrity: sha512-vxhUy4J8lyeyinH7Azl1pdd43GJhZH/tP2weN8TntQblOY+A0XbT8DJk1/oCPuOOyg/Ja757rG0CgHcWC8OfMA==}
|
||||
dev: true
|
||||
|
||||
/@types/node@20.2.5:
|
||||
resolution: {integrity: sha512-JJulVEQXmiY9Px5axXHeYGLSjhkZEnD+MDPDGbCbIAbMslkKwmygtZFy1X6s/075Yo94sf8GuSlFfPzysQrWZQ==}
|
||||
dev: true
|
||||
|
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/@types/ws@8.5.4:
|
||||
resolution: {integrity: sha512-zdQDHKUgcX/zBc4GrwsE/7dVdAD8JR4EuiAXiiUhhfyIJXXb2+PrGshFyeXWQPMmmZ2XxgaqclgpIC7eTXc1mg==}
|
||||
dependencies:
|
||||
'@types/node': 20.2.5
|
||||
dev: true
|
||||
|
||||
/nanoid@4.0.2:
|
||||
resolution: {integrity: sha512-7ZtY5KTCNheRGfEFxnedV5zFiORN1+Y1N6zvPTnHQd8ENUvfaDBeuJDZb2bN/oXwXxu3qkTXDzy57W5vAmDTBw==}
|
||||
engines: {node: ^14 || ^16 || >=18}
|
||||
hasBin: true
|
||||
dev: false
|
||||
|
||||
/ws@8.13.0:
|
||||
resolution: {integrity: sha512-x9vcZYTrFPC7aSIbj7sRCYo7L/Xb8Iy+pW0ng0wt2vCJv7M9HOMy0UoN3rr+IFC7hb7vXoqS+P9ktyLLLhO+LA==}
|
||||
engines: {node: '>=10.0.0'}
|
||||
peerDependencies:
|
||||
bufferutil: ^4.0.1
|
||||
utf-8-validate: '>=5.0.2'
|
||||
peerDependenciesMeta:
|
||||
bufferutil:
|
||||
optional: true
|
||||
utf-8-validate:
|
||||
optional: true
|
||||
dev: false
|
||||
8
agent/tsconfig.json
Normal file
8
agent/tsconfig.json
Normal file
|
|
@ -0,0 +1,8 @@
|
|||
{
|
||||
"extends": "@tsconfig/node16/tsconfig.json",
|
||||
"exclude": ["build.js/", "build/"],
|
||||
"compilerOptions": {
|
||||
"allowJs": true,
|
||||
"checkJs": true
|
||||
}
|
||||
}
|
||||
Loading…
Reference in a new issue