Merge pull request 'Webcam support to use it as a photomaton ( photobooth )' (#2) from webcam into master

Reviewed-on: http://git.n07070.xyz/n07070/littleprynter/pulls/2
This commit is contained in:
n07070 2022-05-09 22:03:46 +00:00
commit 9359c8e503
11 changed files with 560 additions and 97 deletions

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@ -1,13 +1,31 @@
Adafruit-Thermal>=1.1.0
Click>=7.0
Flask>=1.0.2
Flask-Limiter>=1.0.1
itsdangerous>=0.24
Jinja2>=2.10
limits>=1.3
MarkupSafe>=1.0
Pillow>=5.3.0
pyserial>=3.4
six>=1.11.0
Unidecode>=1.0.22
Werkzeug>=0.14.1
Adafruit-Thermal~=1.1.0
appdirs~=1.4.4
argcomplete~=2.0.0
click~=8.1.3
commonmark~=0.9.1
Deprecated~=1.2.13
escpos~=1.9
Flask~=2.1.2
Flask-Limiter~=2.4.5.1
future~=0.18.2
itsdangerous~=2.1.2
Jinja2~=3.1.2
limits~=2.6.1
MarkupSafe~=2.1.1
packaging~=21.3
Pillow~=9.1.0
Pygments~=2.12.0
pyparsing~=3.0.8
pyserial~=3.5
python-barcode~=0.13.1
pyusb~=1.2.1
PyYAML~=6.0
qrcode~=7.3.1
rich~=12.4.1
six~=1.16.0
toml~=0.10.2
typing_extensions~=4.2.0
Unidecode~=1.3.4
viivakoodi~=0.8.0
Werkzeug~=2.1.2
wrapt~=1.14.1

4
run.sh
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@ -1,3 +1,7 @@
virtualenv .
pip install -r requirements.txt
export FLASK_APP=src/main.py
export FLASK_ENV=development
flask run --host 192.168.0.42 --debugger --eager-loading

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@ -51,6 +51,7 @@ app.secret_key = configuration_file["secrets"]["flask_secret_key"]
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
app.config['ALLOWED_EXTENSIONS'] = ALLOWED_EXTENSIONS
app.config['MAX_CONTENT_LENGTH'] = 3 * 1000 * 1000 # Maximum 3Mb for a file upload
app.config['TEMPLATES_AUTO_RELOAD'] = True
# Printer connection
# Uses the class defined in the printer.py file
@ -64,7 +65,7 @@ web = Web(app, printer)
limiter = Limiter(
app,
key_func=get_remote_address,
default_limits=["200 per day", "50 per hour"]
default_limits=["1500 per day", "500 per hour"]
)
@app.route('/')
@ -73,6 +74,12 @@ def index():
app.logger.debug("Loading index")
return render_template('index.html')
@app.route('/webcam')
@limiter.limit("1/second", override_defaults=False)
def webcam():
app.logger.debug("Loading webcam interface")
return render_template('webcam.html')
# API routes
# The api has the following methods
# api/print/{sms,img,letter,qr,barcode}
@ -115,17 +122,24 @@ def api_print_image():
sign = request.form["signature"]
except Exception as e:
flash(str(e),'error')
redirect(url_for('index'))
app.logger.error(str(e) + " - Whoops, no forms submitted or missing signature.")
return redirect(url_for('index'))
if request.method == 'POST':
# check if the post request has the file part
if 'img' not in request.files:
flash('No file found. Did you use the good form ?', 'error')
return redirect(url_for("index"))
else:
file = request.files['img']
try:
if 'img' not in request.files:
flash('No file found. Did you use the good form ?', 'error')
app.logger.error("No file found. Did you use the good form ?")
return redirect(url_for("index"))
else:
file = request.files['img']
except Exception as e:
if sign is not None and photo is not None:
pass
else:
flash(str(e), 'error')
app.logger.error("Couldn't get an image nor signature : " + str(e))
# If the user does not select a file, the browser submits an
# empty file without a filename.

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@ -1,11 +1,7 @@
body {
/* body {
margin-left: 20%;
margin-right: 20%;
}
button {
margin-top: 3em;
}
} */
/*// Small devices (landscape phones, 576px and up)*/
@media (min-width: 576px) {
@ -14,8 +10,8 @@ button {
/*// Medium devices (tablets, 768px and up)*/
@media (min-width: 768px) {
margin-left: 0%;
margin-right: 0%;
margin-left: 0;
margin-right: 0;
}
/*// Large devices (desktops, 992px and up)*/

275
src/static/js/webcam.js Normal file
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@ -0,0 +1,275 @@
let streaming;
var current_stream;
var current_camera_is;
var width = document.getElementById("video").parentNode.parentElement.clientWidth;
var height = width / (4 / 3);
function startup(){
video = document.getElementById('video');
canvas = document.getElementById('canvas');
photo = document.getElementById('photo');
switch_cameras = document.getElementById('flip')
printButton = document.getElementById('print_button');
if (check_webcam() === true ){
setup_events();
clear_canvas();
} else {
no_webcam_error();
console.log("Seems like it's impossible to get a webcam.");
}
}
function check_webcam(){
console.log("Cheking for a camera...");
if (get_front_webcam()) {
console.log("Got front camera !");
return true;
}
if (get_any_webcam()) {
console.log("Got a webcam !");
return true;
}
console.log("Nope");
return false;
}
function setup_events(){
// When the video is ready, we start streaming it to the canvas.
// The canvas is hidden, but it still exists in the browser.
video.addEventListener('canplay', function(ev) {
if (!streaming) {
height = video.videoHeight / (video.videoWidth / width);
if (isNaN(height)) {
height = width / (4 / 3);
}
video.setAttribute('width', width);
video.setAttribute('height', height);
canvas.setAttribute('width', width);
canvas.setAttribute('height', height);
photo.setAttribute('width', width);
photo.setAttribute('height', height);
streaming = true;
printButton.removeAttribute("disabled","");
switch_cameras.removeAttribute("disabled","");
}
}, false);
switch_cameras.addEventListener('click', function(ev) {
flip_cameras();
}, false );
printButton.addEventListener('click', function(ev){
data = take_picture();
try {
print_picture(data);
} catch (e) {
alert("Failed to print a picture because : " + e);
}
ev.preventDefault();
}, false);
}
function clear_canvas() {
var context = canvas.getContext('2d');
context.fillStyle = "#AAA";
context.fillRect(0, 0, canvas.width, canvas.height);
var data = canvas.toDataURL('image/png');
photo.setAttribute('src', data);
}
function dataURLtoFile(dataurl, filename) {
var arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1],
bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
while(n--){
u8arr[n] = bstr.charCodeAt(n);
}
return new File([u8arr], filename, {type:mime});
}
function take_picture(){
var context = canvas.getContext('2d');
if (width && height) {
canvas.width = width;
canvas.height = height;
context.drawImage(video, 0, 0, width, height);
var data = canvas.toDataURL('image/png');
photo.setAttribute('src', data);
} else {
clear_canvas();
}
return data;
}
function print_picture(data){
var url = "/api/print/img"
var picture = dataURLtoFile(data);
const formData = new FormData();
let currentDate = new Date();
let time = currentDate.getHours() + ":" + currentDate.getMinutes() + ":" + currentDate.getSeconds();
formData.set("img", picture, "picture.png");
formData.set("signature", "Printed via the webcam @ " + time)
fetch(url, {
method: 'POST', // or 'PUT'
body: formData,
// headers:{
// 'Content-Type': 'multipart/form-data'
// }
}).then(function(response) { console.log('Success:', response); alert("Picture printed."); } , true)
.catch(error => console.error('Error:', error), false);
}
function flip_cameras(){
switch (current_camera_is) {
case "front":
try {
get_any_webcam();
} catch (e) {
console.log("Could not get another camera");
get_front_webcam();
}
break;
case "any":
try {
get_front_webcam();
} catch (e) {
console.log("Could not get another camera");
get_any_webcam();
}
break;
default:
console.log("Impossible to switch cameras : none is selected.");
}
}
function stop_video_streams(){
console.log("Stopping existing video streams.");
// Stop the tracks
try {
if (current_stream) {
const tracks = current_stream.getTracks();
tracks.forEach(track => track.stop());
console.log("Stopped playing current videostreams.");
return true;
} else {
console.log("No streams currently playing.");
}
} catch (e) {
console.log("Could not stop playing current streams." + e);
}
}
async function get_webcam(options){
stop_video_streams();
try {
await navigator.mediaDevices.getUserMedia(options)
.then(function(stream) {
// on success, stream it in video tag
// the video tag is hidden, as is the canvas.
console.log("Got a camera ( generic )");
printButton.removeAttribute("disabled","");
current_stream = stream;
video.srcObject = stream;
video.play();
return true;
})
.catch(function(err) {
console.log("Didn't manage to get a camera :" + err);
return false;
});
} catch (err) {
console.log("Didn't manage to get a camera :" + err);
return false;
}
}
function get_any_webcam(){
var camera_options = {
video: {
facingMode: 'environment', // Or 'environment' if we want a camera facing away
},
audio: false
};
if(get_webcam(camera_options)){
console.log("Got any camera, or environment camera.");
current_camera_is = "any";
return true;
} else {
return false;
}
}
function get_front_webcam(){
// We try to start with the front facing camera,
// if we have no support, we switch back to a normal camera.
try {
const supports = navigator.mediaDevices.getSupportedConstraints();
if (!supports['facingMode']) {
throw new Error("This browser does not support facingMode!");
} else {
var camera_options = {
video: {
facingMode: 'user', // Or 'environment' if we want a camera facing away
},
audio: false
};
}
} catch (e) {
console.log("Resetting to default camera : " + e);
var camera_options = {
video: true,
audio: false
};
}
if(get_webcam(camera_options)){
console.log("Got the front camera");
current_camera_is = "front";
return true;
} else {
return false;
}
}
function no_webcam_error(){
console.log("Seems like they is no webcam available.")
// We disable the print button is it cannot be clicked.
printButton.setAttribute("disabled","");
// We create an alert message.
const frame_div = document.getElementById("image_dither");
frame_div.removeAttribute('class');
const alert_div = document.createElement("div");
alert_div.setAttribute("class", "alert alert-warning");
alert_div.setAttribute("role", "alert");
var alert_message = document.createTextNode("We where unable to get a Webcam device, this page will not work.");
alert_div.appendChild(alert_message);
frame_div.appendChild(alert_div);
throw new Error("Unable to get a video device, stopping the photobooth.");
}
window.addEventListener('load', startup, false);

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src/templates/banner.html Normal file
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@ -0,0 +1,21 @@
<body class="container">
<div class="col-md-7 offset-md-2">
<a href="/"><img class="rounded" width="100px" src="{{ url_for('static', filename='images/little-printer.png') }}" alt="LittlePrynter icon"></a><h1 class="card-title font-weight-bold">Little Prynter</h1>
<hr>
<div class="alert alert-dark" role="alert">LittlePrynter is under heavy developpement, you may encounter bugs ! If so, try again. Thanks !</div>
<br>
{% with messages = get_flashed_messages(category_filter=('error')) %}
{% if messages %}
{% for message in messages %}
<div class="alert alert-danger" role="alert">⚠️ {{ message }}</div>
{% endfor %}
{% endif %}
{% endwith %}
{% with messages = get_flashed_messages(category_filter=('info')) %}
{% if messages %}
{% for message in messages %}
<div class="alert alert-info" role="alert"> {{ message }}</div>
{% endfor %}
{% endif %}
{% endwith %}

59
src/templates/base.html Normal file
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@ -0,0 +1,59 @@
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>LittlePrynter</title>
<link rel="shortcut icon" href="{{ url_for('static', filename='favicon.ico') }}">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link href="{{ url_for('static', filename='css/bootstrap.min.css') }}" rel="stylesheet">
<link rel="stylesheet" href="{{ url_for('static',filename='css/style.css') }}">
</head>
<body class="container">
<div class="col-auto">
<a href="/"><img class="rounded" width="100px" src="{{ url_for('static', filename='images/little-printer.png') }}" alt="LittlePrynter icon"></a><h1 class="card-title font-weight-bold">Little Prynter</h1>
<hr>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<div class="container-fluid">
<ul class="navbar-nav me-auto mb-2 mb-lg-0">
<li class="nav-item">
<a class="nav-link active" aria-current="page" href="/">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="/webcam">Webcam</a>
</li>
</ul>
</div>
</nav>
<br>
<div class="alert alert-dark" role="alert">LittlePrynter is under heavy developpement, you may encounter bugs ! If so, try again. Thanks !</div>
<br>
{% with messages = get_flashed_messages(category_filter=('error')) %}
{% if messages %}
{% for message in messages %}
<div class="alert alert-danger" role="alert">⚠️ {{ message }}</div>
{% endfor %}
{% endif %}
{% endwith %}
{% with messages = get_flashed_messages(category_filter=('info')) %}
{% if messages %}
{% for message in messages %}
<div class="alert alert-info" role="alert"> {{ message }}</div>
{% endfor %}
{% endif %}
{% endwith %}
{% block content %}
{% endblock %}
<hr>
<footer class="row">
<p class=" text-center">Little Prynter is built by <a href="https://n07070.xyz/about-me/">n07070</a> because it's fun :) | <a href="https://git.n07070.xyz/n07070/littleprynter">Source code - AGPLv3</a></p>
</footer>
</body>
</html>

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@ -0,0 +1,5 @@
<hr>
<footer>Little Prynter is built by <a href="https://n07070.xyz/about-me/">n07070</a> because it's fun :) | <a href="https://git.n07070.xyz/n07070/littleprynter/src/branch/epson-tm-t20iii">Source code - AGPLv3</a></footer>
</div>
</body>
</html>

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@ -0,0 +1,10 @@
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>LittlePrynter</title>
<link rel="shortcut icon" href="{{ url_for('static', filename='favicon.ico') }}">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link href="{{ url_for('static', filename='css/bootstrap.min.css') }}" rel="stylesheet">
<link rel="stylesheet" href="{{ url_for('static',filename='css/style.css') }}">
</head>

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@ -1,71 +1,28 @@
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>LittlePrynter</title>
<link rel="shortcut icon" href="{{ url_for('static', filename='favicon.ico') }}">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link href="{{ url_for('static', filename='css/bootstrap.min.css') }}" rel="stylesheet">
<link rel="stylesheet" href="{{ url_for('static',filename='css/style.css') }}">
</head>
<body class="container">
<div class="col-md-7 offset-md-2">
<a href="/"><img class="rounded" width="100px" src="{{ url_for('static', filename='images/little-printer.png') }}" alt="LittlePrynter icon"></a><h1 class="card-title font-weight-bold">Little Prynter</h1>
<hr>
<div class="alert alert-dark" role="alert">LittlePrynter is under heavy developpement, you may encounter bugs ! If so, try again. Thanks !</div>
<br>
{% with messages = get_flashed_messages(category_filter=('error')) %}
{% if messages %}
{% for message in messages %}
<div class="alert alert-danger" role="alert">⚠️ {{ message }}</div>
{% endfor %}
{% endif %}
{% endwith %}
{% extends 'base.html' %}
{% with messages = get_flashed_messages(category_filter=('info')) %}
{% if messages %}
{% for message in messages %}
<div class="alert alert-info" role="alert"> {{ message }}</div>
{% endfor %}
{% endif %}
{% endwith %}
{% block content %}
<!-- <br>
<h3>Imprimer une image aléatoire</h3>
<a class="btn btn-primary btn-lg" href="/api/print/image"> Imprimer</a>
<hr>
<br> -->
<div class="card">
<h3 class="card-header">Print a short message</h3>
<div class="card-body">
<div class="card">
<h3 class="card-header">Print a short message</h3>
<div class="card-body">
<form class="form-group" action="/api/print/sms" method="post">
<input class="form-control" type="text" name="txt" placeholder="200 chars or less " maxlength="200" required><br>
<input class="form-control" type="text" name="signature" placeholder="Signature or pseudo" maxlength="200" required><br>
<input class="btn btn-primary float-right" type="submit" value="Imprimer" name="imprimer">
</form>
</div>
</div>
<form class="form-group" action="/api/print/sms" method="post">
<input class="form-control" type="text" name="txt" placeholder="200 chars or less " maxlength="200" required><br>
<input class="form-control" type="text" name="signature" placeholder="Signature or pseudo" maxlength="200" required><br>
<br>
<input class="btn btn-primary float-right" type="submit" value="Imprimer" name="imprimer">
</form>
</div>
</div>
<br>
<div class="card">
<h3 class="card-header">Print an image</h3>
<div class="card-body">
<form enctype="multipart/form-data" class="form-group" action="/api/print/img" method="post">
<input class="form-control" type="file" name="img" required><br>
<input class="form-control" type="text" name="signature" placeholder="Signature or pseudo" maxlength="200" required><br>
<input class="btn btn-primary float-right" type="submit" value="Imprimer" name="imprimer">
</form>
</div>
<!-- <div id="pbar" style="display:none">
<img src="{{ url_for('static',filename='load.gif') }}" alt="loading wheel">
</div> -->
</div>
<hr>
<footer>Little Prynter is built by <a href="https://n07070.xyz/about-me/">n07070</a> because it's fun :) | <a href="https://git.n07070.xyz/n07070/littleprynter/src/branch/epson-tm-t20iii">Source code - AGPLv3</a></footer>
</div>
</body>
</html>
<div class="card">
<h3 class="card-header">Print an image</h3>
<div class="card-body">
<form enctype="multipart/form-data" class="form-group" action="/api/print/img" method="post">
<input class="form-control" type="file" name="img" required><br>
<input class="form-control" type="text" name="signature" placeholder="Signature or pseudo" maxlength="200" required><br>
<input class="btn btn-primary float-right" type="submit" value="Imprimer" name="imprimer">
</form>
</div>
</div>
{% endblock %}

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src/templates/webcam.html Normal file
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{% extends 'base.html' %}
{% block content %}
<noscript class="d-block">
<div class="alert alert-warning " role="alert">
<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-bug-fill" viewBox="0 0 16 16">
<path d="M4.978.855a.5.5 0 1 0-.956.29l.41 1.352A4.985 4.985 0 0 0 3 6h10a4.985 4.985 0 0 0-1.432-3.503l.41-1.352a.5.5 0 1 0-.956-.29l-.291.956A4.978 4.978 0 0 0 8 1a4.979 4.979 0 0 0-2.731.811l-.29-.956z"/>
<path d="M13 6v1H8.5v8.975A5 5 0 0 0 13 11h.5a.5.5 0 0 1 .5.5v.5a.5.5 0 1 0 1 0v-.5a1.5 1.5 0 0 0-1.5-1.5H13V9h1.5a.5.5 0 0 0 0-1H13V7h.5A1.5 1.5 0 0 0 15 5.5V5a.5.5 0 0 0-1 0v.5a.5.5 0 0 1-.5.5H13zm-5.5 9.975V7H3V6h-.5a.5.5 0 0 1-.5-.5V5a.5.5 0 0 0-1 0v.5A1.5 1.5 0 0 0 2.5 7H3v1H1.5a.5.5 0 0 0 0 1H3v1h-.5A1.5 1.5 0 0 0 1 11.5v.5a.5.5 0 1 0 1 0v-.5a.5.5 0 0 1 .5-.5H3a5 5 0 0 0 4.5 4.975z"/>
</svg>
This page will need Javascript and your authorization to use the webcam to work. It is not possible because Javascript seems to be deactived on this page.
</div>
</noscript>
<div class="card">
<h3 class="card-header">Photomaton</h3>
<div class="card-body row">
<canvas id="canvas"></canvas>
<video id="video" class="">Video stream not available.</video>
<div class="container-sm">
<div class="row">
<button class="col-sm col-lg-3 offset-lg-2 btn btn-primary justify-content-center" name="print_picture" id="print_button" disabled="">
<svg xmlns="http://www.w3.org/2000/svg" width="54" height="54" fill="currentColor" class="bi bi-printer" viewBox="0 0 16 16">
<path d="M2.5 8a.5.5 0 1 0 0-1 .5.5 0 0 0 0 1z"/>
<path d="M5 1a2 2 0 0 0-2 2v2H2a2 2 0 0 0-2 2v3a2 2 0 0 0 2 2h1v1a2 2 0 0 0 2 2h6a2 2 0 0 0 2-2v-1h1a2 2 0 0 0 2-2V7a2 2 0 0 0-2-2h-1V3a2 2 0 0 0-2-2H5zM4 3a1 1 0 0 1 1-1h6a1 1 0 0 1 1 1v2H4V3zm1 5a2 2 0 0 0-2 2v1H2a1 1 0 0 1-1-1V7a1 1 0 0 1 1-1h12a1 1 0 0 1 1 1v3a1 1 0 0 1-1 1h-1v-1a2 2 0 0 0-2-2H5zm7 2v3a1 1 0 0 1-1 1H5a1 1 0 0 1-1-1v-3a1 1 0 0 1 1-1h6a1 1 0 0 1 1 1z"/>
</svg>
</button>
<button class="col-sm col-lg-3 offset-lg-2 btn btn-secondary justify-content-center" name="flip" id="flip" disabled="">
<svg xmlns="http://www.w3.org/2000/svg" width="54" height="54" fill="currentColor" class="bi bi-arrow-repeat" viewBox="0 0 16 16">
<path d="M11.534 7h3.932a.25.25 0 0 1 .192.41l-1.966 2.36a.25.25 0 0 1-.384 0l-1.966-2.36a.25.25 0 0 1 .192-.41zm-11 2h3.932a.25.25 0 0 0 .192-.41L2.692 6.23a.25.25 0 0 0-.384 0L.342 8.59A.25.25 0 0 0 .534 9z"/>
<path fill-rule="evenodd" d="M8 3c-1.552 0-2.94.707-3.857 1.818a.5.5 0 1 1-.771-.636A6.002 6.002 0 0 1 13.917 7H12.9A5.002 5.002 0 0 0 8 3zM3.1 9a5.002 5.002 0 0 0 8.757 2.182.5.5 0 1 1 .771.636A6.002 6.002 0 0 1 2.083 9H3.1z"/>
</svg>
</button>
</div>
<hr>
<div class="image_dither" id="image_dither">
<picture>
<img id="photo" class="justify-content-center">
</picture>
</div>
<p>This is a as-close-as-possible reprensentation of what is printed on the thermal printer.</p>
</div>
</div>
</div>
<style media="screen">
canvas {
display: none;
}
/* video {
display: none;
} */
.image_dither {
/* width: 300px;
height: 400px; */
image-rendering: smooth;
filter: saturate(0) contrast(250);
}
picture {
image-rendering: smooth;
}
.image_dither > picture::after {
content: '';
width: 100%;
height: 100%;
pointer-events: none;
position: fixed;
display: block;
z-index: 2;
top: 0px;
left: 0px;
background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAYAAACp8Z5+AAAAOklEQVR4nC3KQQFAQAAAwd0EIohANA0uiiiugQgiiLA+5j0AVBewVa/VUGd1qBNgrR5gqW6r8x+7Oj8/xCBur9LU/wAAAABJRU5ErkJggg==');
background-repeat: repeat;
}
#photo {
background: linear-gradient(90deg, #00C9FF 0%, #92FE9D 100%);
padding: 0;
max-width: 100%;
vertical-align: middle;
image-rendering: pixelated;
}
</style>
<script type="text/javascript" src="{{ url_for('static',filename='js/webcam.js') }}"></script>
<br>
{% endblock %}