RLGWebD: webtty.js comparison

comparison webtty.js @ 0:bd412f63ce0d

Put this project under version control, finally.

author	John "Elwin" Edwards <elwin@sdf.org>
date	Sun, 06 May 2012 08:45:40 -0700
parents
children	98bf7c94c954

comparison

equal deleted inserted replaced

--1:000000000000
+:bd412f63ce0d
+#!/usr/bin/env node
+var http = require('http');
+var url = require('url');
+var path = require('path');
+var fs = require('fs');
+//var tty = require("tty");
+var child_process = require("child_process");
+var serveStaticRoot = "/home/elwin/hk/nodejs/rlg/s/";
+var sessions = {};
+/* Constructor for TermSessions.  Note that it opens the terminal and
+* adds itself to the sessions dict.
+*/
+function TermSession(sessid) {
+//var pterm = tty.open("/bin/bash");
+this.child = child_process.spawn("./ptywreck/ptyhelperC", ["bash"]);
+var ss = this;
+/* Eventually we'll need to make sure the sessid isn't in use yet. */
+this.sessid = sessid;
+//this.ptmx = pterm[0];
+//this.child = pterm[1];
+this.alive = true;
+this.data = [];
+this.child.stdout.on("data", function (buf) {
+ss.data.push(buf);
+});
+this.child.stderr.on("data", function (buf) {
+ss.data.push(buf);
+});
+this.child.on("exit", function (code, signal) {
+ss.exitcode = (code != null ? code : 255);
+ss.alive = false;
+/* Wait for all the data to get collected */
+setTimeout(ss.cleanup, 1000);
+});
+this.write = function (data) {
+if (this.alive)
+this.child.stdin.write(data);
+/* Otherwise, throw some kind of exception? */
+};
+this.read = function () {
+if (this.data.length == 0)
+return null;
+var pos = 0;
+var i = 0;
+for (i = 0; i < this.data.length; i++)
+pos += this.data[i].length;
+var nbuf = new Buffer(pos);
+var tptr;
+pos = 0;
+while (this.data.length > 0) {
+tptr = this.data.shift();
+tptr.copy(nbuf, pos);
+pos += tptr.length;
+}
+return nbuf;
+};
+this.close = function () {
+if (this.alive)
+this.child.kill('SIGHUP');
+};
+this.cleanup = function () {
+/* Call this when the child is dead. */
+if (this.alive)
+return;
+//ss.ptmx.destroy();
+/* Give the client a chance to read any leftover data. */
+if (ss.data.length > 0)
+setTimeout(ss.remove, 8000);
+else
+ss.remove();
+};
+this.remove = function () {
+delete sessions[ss.sessid];
+console.log("Session " + this.sessid + " removed.");
+};
+sessions[sessid] = this;
+}
+function randkey() {
+rnum = Math.floor(Math.random() * 65536 * 65536);
+hexstr = rnum.toString(16);
+while (hexstr.length < 8)
+hexstr = "0" + hexstr;
+return hexstr;
+}
+/* Returns a list of the cookies in the request, obviously. */
+function getCookies(req) {
+cookies = [];
+if ("cookie" in req.headers) {
+cookstrs = req.headers["cookie"].split("; ");
+for (var i = 0; i < cookstrs.length; i++) {
+eqsign = cookstrs[i].indexOf("=");
+if (eqsign > 0) {
+name = cookstrs[i].slice(0, eqsign).toLowerCase();
+val = cookstrs[i].slice(eqsign + 1);
+cookies[name] = val;
+}
+else if (eqsign < 0)
+cookies[cookstrs[i]] = null;
+}
+}
+return cookies;
+}
+function urlDec(encstr) {
+var decstr = "";
+var tnum;
+for (var i = 0; i < encstr.length; i++)
+{
+if (encstr.charAt(i) == "+")
+decstr += " ";
+else if (encstr.charAt(i) == "%")
+{
+tnum = Number("0x" + encstr.slice(i + 1, 2));
+if (!isNaN(tnum) && tnum >= 0)
+decstr += String.fromCharCode(tnum);
+i += 2;
+}
+else
+decstr += encstr.charAt(i);
+}
+return decstr;
+}
+/* Returns the contents of a form */
+function getFormValues(formtext) {
+var pairstrs = formtext.split("&");
+var data = {};
+for (var i = 0; i < pairstrs.length; i++)
+{
+var eqsign = pairstrs[i].indexOf("=");
+if (eqsign > 0) {
+rawname = pairstrs[i].slice(0, eqsign);
+rawval = pairstrs[i].slice(eqsign + 1);
+name = urlDec(rawname);
+val = urlDec(rawval);
+if (!(name in data))
+data[name] = [];
+data[name].push(val);
+}
+}
+return data;
+}
+function login(req, res, formdata) {
+var resheaders = {'Content-Type': 'text/plain'};
+var sessid = randkey();
+var nsession = new TermSession(sessid);
+resheaders["Set-Cookie"] = "ID=" + sessid;
+res.writeHead(200, resheaders);
+res.write("l1\n" + sessid + "\n");
+res.end();
+console.log("Started new session with key " + sessid + ", pid " + nsession.child.pid);
+return;
+}
+function findTermSession(req) {
+var cookies = getCookies(req);
+if ("id" in cookies) {
+var sessid = cookies["id"];
+if (sessid in sessions) {
+return sessions[sessid];
+}
+}
+return null;
+}
+function serveStatic(req, res, fname) {
+var nname = path.normalize(fname);
+if (nname == "" || nname == "/")
+nname = "index.html";
+if (nname.match(/\/$/))
+path.join(nname, "index.html"); /* it was a directory */
+var realname = path.join(serveStaticRoot, nname);
+var extension = path.extname(realname);
+path.exists(realname, function (exists) {
+var resheaders = {};
+if (!exists || !extension || extension == ".html")
+resheaders["Content-Type"] = "text/html";
+else if (extension == ".png")
+resheaders["Content-Type"] = "image/png";
+else if (extension == ".css")
+resheaders["Content-Type"] = "text/css";
+else if (extension == ".js")
+resheaders["Content-Type"] = "text/javascript";
+else if (extension == ".svg")
+resheaders["Content-Type"] = "image/svg+xml";
+else
+resheaders["Content-Type"] = "application/octet-stream";
+if (exists) {
+/* Not nice, not sensible.  First see if it's readable, then respond
+* 200 or 500.  Don't throw nasty errors. */
+res.writeHead(200, resheaders);
+fs.readFile(realname, function (error, data) {
+if (error) throw error;
+res.write(data);
+res.end();
+});
+}
+else {
+res.writeHead(404, resheaders);
+res.write("<html><head><title>" + nname + "</title></head>\n<body><h1>" + nname + " Not Found</h1></body></html>\n");
+res.end();
+}
+});
+return;
+}
+function readFeed(res, term) {
+res.writeHead(200, { "Content-Type": "text/plain" });
+if (term) {
+var result = term.read();
+if (result == null)
+resultstr = "";
+else
+resultstr = result.toString("hex");
+res.write("d" + resultstr.length.toString() + "\n" + resultstr + "\n");
+}
+else {
+//console.log("Where's the term?");
+res.write("d0\n\n");
+}
+}
+var errorcodes = [ "Generic Error", "Not logged in", "Invalid data" ];
+function sendError(res, ecode) {
+res.writeHead(200, { "Content-Type": "text/plain" });
+if (ecode < errorcodes.length && ecode > 0)
+res.write("E" + ecode + '\n' + errorcodes[ecode] + '\n');
+else
+res.write("E0\nGeneric Error\n");
+res.end();
+}
+function handler(req, res) {
+/* default headers for the response */
+var resheaders = {'Content-Type': 'text/html'};
+/* The request body will be added to this as it arrives. */
+var reqbody = "";
+var formdata;
+/* Register a listener to get the body. */
+function moredata(chunk) {
+reqbody += chunk;
+}
+req.on('data', moredata);
+/* This will send the response once the whole request is here. */
+function respond() {
+var target = url.parse(req.url).pathname;
+var cterm = findTermSession(req);
+/* First figure out if the client is POSTing to a command interface. */
+if (req.method == 'POST') {
+formdata = getFormValues(reqbody);
+if (target == '/feed') {
+if (!cterm) {
+sendError(res, 1);
+return;
+}
+if (formdata["quit"] == "quit") {
+/* The client wants to quit. */
+// FIXME need to send a message back to the client
+cterm.close();
+}
+else if (formdata["keys"]) {
+/* process the keys */
+hexstr = formdata["keys"][0].replace(/[^0-9a-f]/gi, "");
+if (hexstr.length % 2 != 0) {
+sendError(res, 2);
+return;
+}
+keybuf = new Buffer(hexstr, "hex");
+cterm.write(keybuf);
+}
+readFeed(res, cterm);
+res.end();
+}
+else if (target == "/login") {
+login(req, res, formdata);
+}
+else {
+res.writeHead(405, resheaders);
+res.end();
+}
+}
+else if (req.method == 'GET' || req.method == 'HEAD') {
+if (target == '/feed') {
+if (!cterm) {
+sendError(res, 1);
+return;
+}
+readFeed(res, cterm);
+res.end();
+}
+/* Default page, create a new term */
+/* FIXME New term not created anymore, is a special case still needed? */
+else if (target == '/') {
+serveStatic(req, res, "/");
+}
+else /* Go look for it in the filesystem */
+serveStatic(req, res, target);
+}
+else { /* Some other method */
+res.writeHead(501, resheaders);
+res.write("<html><head><title>501</title></head>\n<body><h1>501 Not Implemented</h1></body></html>\n");
+res.end();
+}
+return;
+}
+req.on('end', respond);
+}
+process.on("exit", function () {
+for (var sessid in sessions) {
+if (sessions[sessid].alive)
+sessions[sessid].child.kill('SIGHUP');
+}
+console.log("Quitting...");
+return;
+});
+process.env["TERM"] = "xterm-256color";
+http.createServer(handler).listen(8080, "127.0.0.1");
+console.log('Server running at http://127.0.0.1:8080/');