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cmd/tsconnect: make terminal resizable

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Makes the terminal container DOM node as large as the window (except for
the header) via flexbox. The xterm.js terminal is then sized to fit via
xterm-addon-fit. Once we have a computed rows/columns size, and we can
tell the SSH session of the computed size.

Required introducing an IPNSSHSession type to allow the JS to control
the SSH session once opened. That alse allows us to programatically
close it, which we do when the user closes the window with the session
still active.

I initially wanted to open the terminal in a new window instead (so that
it could be resizable independently of the main window), but xterm.js
does not appear to work well in that mode (possibly because it adds an
IntersectionObserver to pause rendering when the window is not visible,
and it ends up doing that when the parent window is hidden -- see
xtermjs/xterm.js@87dca56dee)

Fixes #5150

Signed-off-by: Mihai Parparita <mihai@tailscale.com>
pull/5276/head
Mihai Parparita 2 years ago committed by Mihai Parparita
parent 8725b14056
commit 9a2171e4ea
10 changed files with 129 additions and 49 deletions
Show Stats Download Patch File Download Diff File

45
cmd/tsconnect/index.html
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@ -5,33 +5,38 @@
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="stylesheet" type="text/css" href="dist/index.css" />
</head>
<body class="flex flex-col min-h-screen">
<div class="bg-gray-100 border-b border-gray-200 pt-4 pb-2 mb-6">
<body class="flex flex-col h-screen overflow-hidden">
<div class="bg-gray-100 border-b border-gray-200 pt-4 pb-2">
<header class="container mx-auto px-4 flex flex-row items-center">
<h1 class="text-3xl font-bold grow">Tailscale Connect</h1>
<div class="text-gray-600" id="state">Loading…</div>
</header>
</div>
<form
id="ssh-form"
class="container mx-auto px-4 hidden flex justify-center"
<div
id="content"
class="flex-grow flex flex-col justify-center overflow-hidden"
>
<input type="text" class="input username" placeholder="Username" />
<div class="select-with-arrow mx-2">
<select class="select"></select>
</div>
<input
type="submit"
class="button bg-green-500 border-green-500 text-white hover:bg-green-600 hover:border-green-600"
value="SSH"
/>
</form>
<div id="no-ssh" class="container mx-auto px-4 hidden text-center">
None of your machines have
<a href="https://tailscale.com/kb/1193/tailscale-ssh/" class="link"
>Tailscale SSH</a
<form
id="ssh-form"
class="container mx-auto px-4 hidden flex justify-center"
>
enabled. Give it a try!
<input type="text" class="input username" placeholder="Username" />
<div class="select-with-arrow mx-2">
<select class="select"></select>
</div>
<input
type="submit"
class="button bg-green-500 border-green-500 text-white hover:bg-green-600 hover:border-green-600"
value="SSH"
/>
</form>
<div id="no-ssh" class="container mx-auto px-4 hidden text-center">
None of your machines have
<a href="https://tailscale.com/kb/1193/tailscale-ssh/" class="link"
>Tailscale SSH</a
>
enabled. Give it a try!
</div>
</div>
<script src="dist/index.js"></script>
</body>

3
cmd/tsconnect/package.json
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@ -8,7 +8,8 @@
"qrcode": "^1.5.0",
"tailwindcss": "^3.1.6",
"typescript": "^4.7.4",
"xterm": "^4.18.0"
"xterm": "^4.18.0",
"xterm-addon-fit": "^0.5.0"
},
"scripts": {
"lint": "tsc --noEmit"

4
cmd/tsconnect/src/index.css
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@ -73,3 +73,7 @@
background-color: currentColor;
clip-path: polygon(100% 0%, 0 0%, 50% 100%);
}
body.ssh-active #ssh-form {
@apply hidden;
}

4
cmd/tsconnect/src/index.ts
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@ -52,3 +52,7 @@ function handleGoPanic(err?: string) {
}
let panicNode: HTMLDivElement | undefined
export function getContentNode(): HTMLDivElement {
return document.querySelector("#content") as HTMLDivElement
}

3
cmd/tsconnect/src/login.ts
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@ -3,6 +3,7 @@
// license that can be found in the LICENSE file.
import * as qrcode from "qrcode"
import { getContentNode } from "./index"
export async function showLoginURL(url: string) {
if (loginNode) {
@ -30,7 +31,7 @@ export async function showLoginURL(url: string) {
linkNode.appendChild(document.createTextNode(url))
document.body.appendChild(loginNode)
getContentNode().appendChild(loginNode)
}
export function hideLoginURL() {

2
cmd/tsconnect/src/notifier.ts
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@ -47,7 +47,7 @@ export function notifyState(ipn: IPN, state: IPNState) {
showLogoutButton(ipn)
break
}
const stateNode = document.getElementById("state") as HTMLDivElement
const stateNode = document.querySelector("#state") as HTMLDivElement
stateNode.textContent = stateLabel ?? ""
}

44
cmd/tsconnect/src/ssh.ts
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@ -3,10 +3,12 @@
// license that can be found in the LICENSE file.
import { Terminal } from "xterm"
import { FitAddon } from "xterm-addon-fit"
import { getContentNode } from "./index"
export function showSSHForm(peers: IPNNetMapPeerNode[], ipn: IPN) {
const formNode = document.getElementById("ssh-form") as HTMLDivElement
const noSSHNode = document.getElementById("no-ssh") as HTMLDivElement
const formNode = document.querySelector("#ssh-form") as HTMLDivElement
const noSSHNode = document.querySelector("#no-ssh") as HTMLDivElement
const sshPeers = peers.filter(
(p) => p.tailscaleSSHEnabled && p.online !== false
@ -39,26 +41,23 @@ export function showSSHForm(peers: IPNNetMapPeerNode[], ipn: IPN) {
}
export function hideSSHForm() {
const formNode = document.getElementById("ssh-form") as HTMLDivElement
const formNode = document.querySelector("#ssh-form") as HTMLDivElement
formNode.classList.add("hidden")
}
function ssh(hostname: string, username: string, ipn: IPN) {
document.body.classList.add("ssh-active")
const termContainerNode = document.createElement("div")
termContainerNode.className = "p-3"
document.body.appendChild(termContainerNode)
termContainerNode.className = "flex-grow bg-black p-2 overflow-hidden"
getContentNode().appendChild(termContainerNode)
const term = new Terminal({
cursorBlink: true,
})
const fitAddon = new FitAddon()
term.loadAddon(fitAddon)
term.open(termContainerNode)
// Cancel wheel events from scrolling the page if the terminal has scrollback
termContainerNode.addEventListener("wheel", (e) => {
if (term.buffer.active.baseY > 0) {
e.preventDefault()
}
})
fitAddon.fit()
let onDataHook: ((data: string) => void) | undefined
term.onData((e) => {
@ -67,14 +66,33 @@ function ssh(hostname: string, username: string, ipn: IPN) {
term.focus()
ipn.ssh(hostname, username, {
const sshSession = ipn.ssh(hostname, username, {
writeFn: (input) => term.write(input),
setReadFn: (hook) => (onDataHook = hook),
rows: term.rows,
cols: term.cols,
onDone: () => {
resizeObserver.disconnect()
term.dispose()
termContainerNode.remove()
document.body.classList.remove("ssh-active")
window.removeEventListener("beforeunload", beforeUnloadListener)
},
})
// Make terminal and SSH session track the size of the containing DOM node.
const resizeObserver = new ResizeObserver((entries) => {
fitAddon.fit()
})
resizeObserver.observe(termContainerNode)
term.onResize(({ rows, cols }) => {
sshSession.resize(rows, cols)
})
// Close the session if the user closes the window without an explicit
// exit.
const beforeUnloadListener = () => {
sshSession.close()
}
window.addEventListener("beforeunload", beforeUnloadListener)
}

7
cmd/tsconnect/src/wasm_js.ts
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@ -25,7 +25,12 @@ declare global {
cols: number
onDone: () => void
}
): void
): IPNSSHSession
}
interface IPNSSHSession {
resize(rows: number, cols: number): boolean
close(): boolean
}
interface IPNStateStorage {

61
cmd/tsconnect/wasm/wasm_js.go
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@ -142,11 +142,10 @@ func newIPN(jsConfig js.Value) map[string]any {
log.Printf("Usage: ssh(hostname, userName, termConfig)")
return nil
}
go jsIPN.ssh(
return jsIPN.ssh(
args[0].String(),
args[1].String(),
args[2])
return nil
}),
}
}
@ -256,13 +255,42 @@ func (i *jsIPN) logout() {
go i.lb.Logout()
}
func (i *jsIPN) ssh(host, username string, termConfig js.Value) {
writeFn := termConfig.Get("writeFn")
setReadFn := termConfig.Get("setReadFn")
rows := termConfig.Get("rows").Int()
cols := termConfig.Get("cols").Int()
onDone := termConfig.Get("onDone")
func (i *jsIPN) ssh(host, username string, termConfig js.Value) map[string]any {
jsSSHSession := &jsSSHSession{
jsIPN: i,
host: host,
username: username,
termConfig: termConfig,
}
go jsSSHSession.Run()
return map[string]any{
"close": js.FuncOf(func(this js.Value, args []js.Value) interface{} {
return jsSSHSession.Close() != nil
}),
"resize": js.FuncOf(func(this js.Value, args []js.Value) interface{} {
rows := args[0].Int()
cols := args[1].Int()
return jsSSHSession.Resize(rows, cols) != nil
}),
}
}
type jsSSHSession struct {
jsIPN *jsIPN
host string
username string
termConfig js.Value
session *ssh.Session
}
func (s *jsSSHSession) Run() {
writeFn := s.termConfig.Get("writeFn")
setReadFn := s.termConfig.Get("setReadFn")
rows := s.termConfig.Get("rows").Int()
cols := s.termConfig.Get("cols").Int()
onDone := s.termConfig.Get("onDone")
defer onDone.Invoke()
write := func(s string) {
@ -274,7 +302,7 @@ func (i *jsIPN) ssh(host, username string, termConfig js.Value) {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
c, err := i.dialer.UserDial(ctx, "tcp", net.JoinHostPort(host, "22"))
c, err := s.jsIPN.dialer.UserDial(ctx, "tcp", net.JoinHostPort(s.host, "22"))
if err != nil {
writeError("Dial", err)
return
@ -283,10 +311,10 @@ func (i *jsIPN) ssh(host, username string, termConfig js.Value) {
config := &ssh.ClientConfig{
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
User: username,
User: s.username,
}
sshConn, _, _, err := ssh.NewClientConn(c, host, config)
sshConn, _, _, err := ssh.NewClientConn(c, s.host, config)
if err != nil {
writeError("SSH Connection", err)
return
@ -302,6 +330,7 @@ func (i *jsIPN) ssh(host, username string, termConfig js.Value) {
writeError("SSH Session", err)
return
}
s.session = session
write("Session Established\r\n")
defer session.Close()
@ -338,11 +367,19 @@ func (i *jsIPN) ssh(host, username string, termConfig js.Value) {
err = session.Wait()
if err != nil {
writeError("Exit", err)
writeError("Wait", err)
return
}
}
func (s *jsSSHSession) Close() error {
return s.session.Close()
}
func (s *jsSSHSession) Resize(rows, cols int) error {
return s.session.WindowChange(rows, cols)
}
type termWriter struct {
f js.Value
}

5
cmd/tsconnect/yarn.lock
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@ -603,6 +603,11 @@ xtend@^4.0.2:
resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.2.tgz#bb72779f5fa465186b1f438f674fa347fdb5db54"
integrity sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==
xterm-addon-fit@^0.5.0:
version "0.5.0"
resolved "https://registry.yarnpkg.com/xterm-addon-fit/-/xterm-addon-fit-0.5.0.tgz#2d51b983b786a97dcd6cde805e700c7f913bc596"
integrity sha512-DsS9fqhXHacEmsPxBJZvfj2la30Iz9xk+UKjhQgnYNkrUIN5CYLbw7WEfz117c7+S86S/tpHPfvNxJsF5/G8wQ==
xterm@^4.18.0:
version "4.18.0"
resolved "https://registry.yarnpkg.com/xterm/-/xterm-4.18.0.tgz#a1f6ab2c330c3918fb094ae5f4c2562987398ea1"

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