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2025-10-31 18:38:33 -04:00
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.old/
build/

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config.go Normal file
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package main
const CONF_TIMEOUT_MS = 5000
var CONF_ICE_SERVERS = [1]string{"stun:stun.l.google.com:19302"}

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display.go Normal file
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package main
// Packages
import "github.com/gorilla/websocket"
import "sync"
// Display instance
type Display struct {
// WebSocket used to communicate with the display
sock *websocket.Conn
// User currently connected to the display
user *User
// One-time-pass currently shown on the display
otp string
}
// List of all connected displays
var displaysLck sync.Mutex
var displays map[string]*Display
// Get the display back to its idle state
func (this *Display) reset() {
// Send a reset command
this.sock.WriteMessage(websocket.TextMessage, encodeMessage(Message{
mtype: "reset",
}))
}
// Switch the display to streaming mode
func (this *Display) stream() {
// Send a show-pin command
this.sock.WriteMessage(websocket.TextMessage, encodeMessage(Message{
mtype: "stream",
}))
}
// Send a WebRTC offer to the display and get an answer
func (this *Display) webRTCOffer(offer string, timeoutMS int) string {
// TODO
return ""
}
// Send an ICE candiate to the display
func (this *Display) iceCandidate(candidate string) {
// Send the candidate
sendMessage(this.sock, Message{
mtype: "ice-candidate",
arguments: map[string]interface{}{
"candidate": candidate,
},
})
}
// Connection handler for displays
func displayHandler(sock *websocket.Conn, dispID string) {
}

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go.mod Normal file
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module ryzerth/wiscast
go 1.23
require github.com/gorilla/websocket v1.5.3

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go.sum Normal file
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github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=

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EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

22
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package main
// Packages
import "log"
import "net/http"
// import "os"
func main() {
// Load the configuration from environment variables
// TODO
// Create a handler for the static website
static := http.FileServer(http.Dir("./www"))
http.Handle("/", static)
// Create a handler for the signaling backend
// http.HandleFunc("/sig", wsHandler)
// Run the server
err := http.ListenAndServe(":3000", nil)
if( err != nil) { log.Fatal(err) }
}

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package main
import "github.com/gorilla/websocket"
//import "encoding/json"
// Backend message object
type Message struct {
// Type of message
mtype string
// Arguments of the message
arguments map[string]interface{}
}
// Get the display back to its idle state
func encodeMessage(msg Message) []byte {
// TODO
return nil
}
// Get the display back to its idle state
func decodeMessage(data []byte) Message {
// TODO
return Message{}
}
// Encode a message and send it over a WebSocket
func sendMessage(sock *websocket.Conn, msg Message) {
// Encode and send the message
sock.WriteMessage(websocket.TextMessage, encodeMessage(msg))
}
// Receive a message from a WebSocket and decode it
func recvMessage(sock *websocket.Conn, timeoutMS int) Message {
// TODO
return Message{}
}
// Encode an error message and send it over a WebSocket
func sendErrorMessage(sock *websocket.Conn, err string) {
// Send the error message
sock.WriteMessage(websocket.TextMessage, encodeMessage(Message{
mtype: "error",
arguments: map[string]interface{}{
"error": err,
},
}))
}

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# WisCast: Screen Casting Made Easy
No cables, no software to install, just cast your screen using any modern web browser.
TODO: Show illustration
WisCast uses WebRTC to cast your screen directly to any device running a WebRTC-capable web browser.
Since WebRTC allows for direct user-to-screen video streaming, the latency is as low as it gets for wireless screen casting.
# Usage
Connect to the instance that the display you wish to cast to is configured to use. The URL will be shown on the display.
TODO: Show a screenshot
Next, enter the display's ID and the currently displayed one-time
# Install the server (Docker)
The simplest way to install WisCast is using docker, simply use the `wiscast` image as shown below.
```
docker run --name "My (name) Instance" -p8080:80 (name)
```
Next, move to the section about [configuring an HTTPs proxy]()
# Install the server (From source)
TODO
# Configure an HTTPs proxy
WebRTC, the video streaming technology use in this software, requires HTTPs for security reasons.
As such, you next needs to configure an HTTPs proxy to forward connections to the server instance.
# Statement on AI use
No AI was ever used at any point to develop this software.
This is entirely written by a human.

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package main
// Packages
//import "log"
import "github.com/gorilla/websocket"
//import "encoding/json"
import "sync"
// General client instance
type User struct {
// WebSocket used to communicate with the user
sock *websocket.Conn
// Display mutex
displayMtx sync.Mutex
// Display that the user is connecting to
display *Display
}
// TODO: Check type
// Connection handler for users
func userHandler(sock *websocket.Conn) {
// Initialize the user instance
user := User{ sock: sock, display: nil }
// Send back the config for the user to use
sendMessage(sock, Message{
mtype: "config",
arguments: map[string]interface{}{
"timeout": CONF_TIMEOUT_MS,
"iceServers": CONF_ICE_SERVERS,
},
})
// Message loop
for {
// Receive a message
msg := recvMessage(sock, 0)
// TODO: exit on error
// Handle the message depending on its type
switch msg.mtype {
case "connect":
// Check that a display ID was provided
if msg.arguments["dispID"] == nil {
sendErrorMessage(sock, "Missing display ID")
continue;
}
// Check that an OTP was provided
if msg.arguments["otp"] == nil {
sendErrorMessage(sock, "Missing OTP")
continue;
}
// Acquire the display ID list
displaysLck.Lock()
// Check that the display ID exists
dispID := msg.arguments["dispID"].(string)
if displays[dispID] == nil {
// Release the display list
displaysLck.Unlock()
// Send back an error
sendErrorMessage(sock, "Unknown display")
continue;
}
// Check the OTP
otp := msg.arguments["otp"].(string)
if otp == "" || otp != displays[dispID].otp {
// Release the display list
displaysLck.Unlock()
// Send back an error
sendErrorMessage(sock, "Invalid OTP")
continue;
}
// TODO: Check types
// Acquire the user's display pointer
user.displayMtx.Lock()
// Register the user and display to each other
user.display = displays[dispID]
user.display.user = &user
// Put the display into streaming mode
user.display.stream()
// TODO: Check for error
// Release the user's display pointer
user.displayMtx.Lock()
// Release the display list
displaysLck.Unlock()
// Notify the user of the successful connection
sendMessage(sock, Message{
mtype: "success",
})
case "webrtc-offer":
// Check that the message contains an offer
if msg.arguments["offer"] == nil {
// Send back an error
sendErrorMessage(sock, "No offer given")
continue;
}
// TODO: Check type
// Acquire the user's display pointer
user.displayMtx.Lock()
// Check that the user is connected to a display
if user.display == nil {
// Release the user's display pointer
user.displayMtx.Unlock()
// Send back an error
sendErrorMessage(sock, "Not connected")
continue;
}
// Send the offer to the display and get the response
answer := user.display.webRTCOffer(msg.arguments["offer"].(string), CONF_TIMEOUT_MS)
// TODO: Check for error
// Release the user's display pointer
user.displayMtx.Unlock()
// Send back the response
sendMessage(sock, Message{
mtype: "webrtc-answer",
arguments: map[string]interface{}{
"answer": answer,
},
})
case "ice-candidate":
// Check that the message contains an ice candidate
if msg.arguments["candidate"] == nil {
// Send back an error
sendErrorMessage(sock, "No offer given")
continue;
}
// TODO: Check type
// Acquire the user's display pointer
user.displayMtx.Lock()
// Check that the user is connected to a display
if user.display == nil {
// Release the user's display pointer
user.displayMtx.Unlock()
// Send back an error
sendErrorMessage(sock, "Not connected")
continue;
}
// Send the ice candidtate to the display
user.display.iceCandidate(msg.arguments["candidate"].(string))
// Release the user's display pointer
user.displayMtx.Unlock()
default:
// Send back an error
sendErrorMessage(sock, "Invalid message type")
}
}
// If the user was connected to a display, disconnect it
}

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package main
// Packages
import "log"
import "net/http"
import "github.com/gorilla/websocket"
// Create the websocket upgrader
var upgrader = websocket.Upgrader{}
// Handler for the signalling backend
func wsHandler(respWriter http.ResponseWriter, req *http.Request) {
// Upgrade the HTTP request to a WebSocket session
sock, err := upgrader.Upgrade(respWriter, req, nil)
if (err != nil) {
log.Print(err)
return
}
// Ensure that when this handler exits, the WebSocket closes
defer sock.Close()
// Receive the init message
msg := recvMessage(sock, 5000)
// If it's not an init message, give up
if msg.mtype != "init" { return }
// Handle the client depending on its type
switch msg.arguments["clientType"] {
case "user":
// Handle as a user
userHandler(sock)
case "display":
// Check that the display has provided its ID
if msg.arguments["dispID"] == nil { return }
// Handle as a display
displayHandler(sock, msg.arguments["dispID"].(string))
}
}

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/* Debugging */
body {
background: #202025;
font-family: Arial;
color: white;
padding: 0;
margin: 0;
}
#localPlayback {
background: black;
width: 200%;
border-radius: 0.25em;
transform: translate(-25%, 0);
}
#playback {
position: fixed;
margin: 0;
padding: 0;
width: 100%;
height: 100%;
background: black;
}
#connForm, #pinValForm, #streamForm, #idleScreen, #pinScreen {
width: 25em;
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
}
input {
/* Sizing */
box-sizing: border-box;
width: 100%;
padding: 0.7em;
/* Border parameters */
border-style: solid;
border-width: 1px;
border-color: #949494;
border-radius: 0.25em;
/* Text parameters */
color: black;
font-size:medium;
text-align:center;
/* Background parameters */
background: #e6e6e6;
}
button {
/* Sizing */
box-sizing: border-box;
width: 100%;
padding: 0.7em;
/* Border parameters */
border-style: solid;
border-width: 1px;
border-color: #2189ff;
border-radius: 0.25em;
/* Text parameters */
color: white;
font-size:medium;
text-align:center;
/* Background parameters */
background: #1080FF;
/* Cursor parameters */
cursor:pointer;
}
button:hover {
/* Background parameters */
background: #2189ff;
}
button:active {
/* Background parameters */
background: #2b8eff;
}
button:disabled {
/* Border parameters */
border-color: #797979;
/* Text parameters */
color: rgb(145, 145, 145);
/* Background parameters */
background: #5f5f5f;
/* Cursor parameters */
cursor: not-allowed;
}
.TV {
font-size: 80pt;
margin: 0;
width: 100%;
text-align: center;
}
footer {
/* Text parameters */
color: white;
font-size:small;
/* Position */
position: absolute;
bottom: 0;
right: 0;
/* Margins */
margin: 0.5em;
}
a {
color: #1080FF;
text-decoration: none;
}
h1 {
text-align: center;
}
#dispIDLabel, #pinLabel {
font-size: 30pt;
}
#dispID, #pin {
font-size: 80pt;
}

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<!DOCTYPE html>
<html>
<head>
<!-- Configure the page encoding -->
<meta charset="UTF-8">
<!-- Title of the software -->
<title>Quick Screen Share - Screen</title>
<!-- Load the stylesheet from the main style file -->
<link rel="stylesheet" href="/css/style.css">
</head>
<body>
<div id="idleScreen">
<span id="dispIDLabel">Display ID:</span><br>
<span id="dispID"></span>
</div>
<div id="pinScreen" hidden>
<span id="pinLabel">PIN:</span><br>
<span id="pin"></span>
</div>
<!-- Video widget -->
<video id="playback" autoplay playsinline hidden></video>
</body>
<!-- Footer to show credit to the software and developers -->
<footer id="credits">
Powered by <a href="https://x.com/ryzerth" target="_blank">Quick Screen Share</a>. Made with ❤️ by <a href="https://x.com/ryzerth" target="_blank">Ryzerth</a>
</footer>
<!-- Main screen code -->
<script src="/scripts/screen.js"></script>
</html>

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www/index.html Normal file
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<!DOCTYPE html>
<html>
<head>
<!-- Configure the page encoding -->
<meta charset="UTF-8">
<!-- Title of the software -->
<title>Quick Screen Share</title>
<!-- Load the stylesheet from the main style file -->
<link rel="stylesheet" href="/css/style.css">
</head>
<body>
<!-- Connection form -->
<div id="connForm">
<p class="TV">📺</p><br>
<input type="text" id="dispName" placeholder="Display ID" required autocomplete="off" oninput="onDispNameChange()"><br><br>
<input type="text" id="otp" placeholder="OTP" required autocomplete="off" oninput="onOTPChange()"><br><br>
<button id="connect" onclick="connect()" disabled autocomplete="off">Connect</button>
</div>
<!-- Streaming form -->
<div id="streamForm" hidden>
<h1>You are live!</h1>
<video id="localPlayback" autoplay playsinline></video><br><br>
<button id="disconnect" onclick="disconnect()">Disconnect</button>
</div>
</body>
<!-- Footer to show credit to the software and developers -->
<footer>
Powered by <a href="https://x.com/ryzerth" target="_blank">Quick Screen Share</a>. Made with ❤️ by <a href="https://x.com/ryzerth" target="_blank">Ryzerth</a>
</footer>
<!-- Main client code -->
<script src="/scripts/client.js"></script>
</html>

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// Streaming objects
let sock = null;
let stream = null;
let conn = null;
// GUI Objects
let connForm = document.querySelector('#connForm');
let dispNameTb = document.querySelector('#dispName');
let connBtn = document.querySelector('#connect');
let pinValForm = document.querySelector('#pinValForm');
let dispPINTb = document.querySelector('#dispPIN');
let validateBtn = document.querySelector('#validate');
let streamForm = document.querySelector('#streamForm');
let locPlayback = document.querySelector('#localPlayback');
// Make sure the connect button cannot be pressed if there is no display name
function onDispNameChange() {
connBtn.disabled = !(dispNameTb.value.length > 0);
}
function onPINChange() {
validateBtn.disabled = !(dispPINTb.value.length === 6);
}
// Handle enter key pressed
dispNameTb.addEventListener('keyup', (event) => {
if (event.key === 'Enter' && !connBtn.disabled) {
connBtn.click();
}
})
dispPINTb.addEventListener('keyup', (event) => {
if (event.key === 'Enter' && !validateBtn.disabled) {
validateBtn.click();
}
})
// WebSocket message handler
async function onMessage(data) {
// Parse the message
console.log(data)
const msg = JSON.parse(data);
// Process depending on the type
switch (msg.type) {
case 'disp-ok':
// Switch to the PIN screen
connForm.hidden = true;
pinValForm.hidden = false;
dispPINTb.focus();
dispPINTb.select();
break;
case 'disp-error':
// Show the error
// TODO
console.log('ERROR: ' + msg.error)
break;
case 'auth-ok':
// Show the status update
validateBtn.textContent = 'Starting the Stream...';
await startStream();
break;
case 'answer':
console.log('Got answer')
// Pass on the offer to WebRTC
await conn.setRemoteDescription(new RTCSessionDescription(msg.answer));
break;
case 'ice-candidate':
console.log('Got ice candidate')
// Add the ice candidate to the WebRTC connection
await conn.addIceCandidate(msg.candidate);
break;
case 'disconnect':
// Reload the page
location.reload();
break;
default:
console.dir(msg)
break;
}
}
async function startStream() {
// Get the stream for the screen
stream = await navigator.mediaDevices.getDisplayMedia({ video: { cursor: 'always' } });
// Create the connection
conn = new RTCPeerConnection({'iceServers': [{'urls': 'stun:stun.l.google.com:19302'}]});
// Handle ice candidates
conn.addEventListener('icecandidate', async (event) => {
// If there is a new candidate, send it to the peer through websockets
if (event.candidate) {
await sock.send(JSON.stringify({
type: 'ice-candidate',
candidate: event.candidate
}))
}
});
// Handle connection and disconnection of peer
conn.addEventListener('connectionstatechange', (event) => {
switch (conn.connectionState) {
case 'connected':
// Switch to stream screen
pinValForm.hidden = true;
streamForm.hidden = false;
locPlayback.srcObject = stream;
console.log("Connected!")
break;
case 'disconnected':
console.log("Disconnected.")
// Reload the page to ensure the state is complete reset
location.reload();
break;
default:
break;
}
});
// Start streaming the screen
stream.getTracks().forEach(track => {
conn.addTrack(track, stream);
});
// If the stream ends, reload the page
stream.getVideoTracks()[0].addEventListener('ended', (event) => {
location.reload();
})
// Create and send an offer
const offer = await conn.createOffer();
await conn.setLocalDescription(offer);
await sock.send(JSON.stringify({
type: 'offer',
offer: offer
}))
}
async function connect() {
// Disable the connect button and show status
dispNameTb.disabled = true;
connBtn.disabled = true;
connBtn.textContent = 'Connecting...';
// Send a connect command to the server
await sock.send(JSON.stringify({
type: 'connect',
dispID: dispNameTb.value
}));
}
async function validatePIN() {
// Disable the validate button and show status
dispPINTb.disabled = true;
validateBtn.disabled = true;
validateBtn.textContent = 'Checking the PIN...';
// Send the validate pin command to the server
await sock.send(JSON.stringify({
type: 'validate-pin',
pin: dispPINTb.value
}));
}
async function disconnect() {
// Just reload the page
location.reload();
}
// Connect to the server using WebSockets
console.log('Connecting to websocket...')
sock = new WebSocket(`ws://${location.host}/sig`);
sock.addEventListener('open', async (event) => {
console.log('Connected to websocket')
});
sock.addEventListener('message', (event) => { onMessage(event.data); })

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// Get or generate a display ID
let params = new URLSearchParams(document.location.search);
let dispID = params.get("dispID");
if (dispID === null) {
// Generate a random name (TODO)
dispID = self.crypto.randomUUID().substring(0, 6);
}
// App objects
let sock = null;
let conn = null;
// GUI Objects
let idleScreen = document.querySelector('#idleScreen');
let dispIDSpan = document.querySelector('#dispID');
let pinScreen = document.querySelector('#pinScreen');
let pinSpan = document.querySelector('#pin');
let playback = document.querySelector('#playback');
let credits = document.querySelector('#credits');
// Show the display ID
dispIDSpan.textContent = dispID;
async function reset() {
// Completely reset the state
playback.hidden = true;
pinScreen.hidden = true;
idleScreen.hidden = false;
credits.hidden = false;
playback.srcObject = null;
conn = null;
// Initialize WebRTC
await initRTC();
}
// WebSocket message handler
async function onMessage(data) {
// Parse the message
console.log(data)
const msg = JSON.parse(data);
// Process depending on the type
switch (msg.type) {
case 'conn-req':
// Show the pin
pinSpan.textContent = msg.pin;
// Switch to pin mode
idleScreen.hidden = true;
pinScreen.hidden = false;
break;
case 'offer':
console.log('Got offer')
// Pass on the offer to WebRTC
await conn.setRemoteDescription(new RTCSessionDescription(msg.offer));
// Create an answer
answer = await conn.createAnswer();
await conn.setLocalDescription(answer);
// Encode and send the answer
await sock.send(JSON.stringify({
type: 'answer',
answer: answer
}))
break;
case 'ice-candidate':
console.log('Got ice candidate')
// Add the ice candidate to the WebRTC connection
await conn.addIceCandidate(msg.candidate);
break;
case 'auth-ok':
break;
case 'disconnect':
// Reset the display
reset();
break;
default:
break;
}
}
async function initRTC() {
// Create the WebRTC connection
conn = new RTCPeerConnection({'iceServers': [{'urls': 'stun:stun.l.google.com:19302'}]});
// Handle new ice candidates
conn.addEventListener('icecandidate', async (event) => {
// If there is a new candidate, send it to the peer through websockets
if (event.candidate) {
await sock.send(JSON.stringify({
type: 'ice-candidate',
candidate: event.candidate
}))
}
});
// Handle connection and disconnection of peer
conn.addEventListener('connectionstatechange', (event) => {
switch (conn.connectionState) {
case 'connected':
// Switch to playback mode
pinScreen.hidden = true;
credits.hidden = true;
playback.hidden = false;
break;
case 'disconnected':
// Reset the display
reset();
break;
default:
break;
}
});
// Send remote stream to the playback widget
conn.addEventListener('track', (event) => {
const [remoteStream] = event.streams;
playback.srcObject = remoteStream;
});
}
// Main function for the app
async function main() {
// Connect to the server using WebSockets
console.log('Connecting to websocket...')
sock = new WebSocket(`ws://${location.host}/sig`);
// Add handlers for the socket
sock.addEventListener('message', (event) => { onMessage(event.data); })
sock.addEventListener('open', async (event) => {
console.log('Connected to websocket')
// Tell the server that this is a screen
await sock.send(JSON.stringify({
type: 'screen',
name: dispID
}))
// Initialize WebRTC
await initRTC();
});
}
// Run the main function
main();