Update gitignore

.gitignore

@@ -2,6 +2,7 @@
 __pycache__/
 *.py[cod]
 *$py.class
+CACHEDIR.TAG
 
 # C extensions
 *.so

configuration/config.toml

@@ -6,6 +6,12 @@ vendor_id = 0x04b8
 device_id = 0x0e28
 upload_folder = "src/static/uploads"
 
+# Raspberry Pi Configuration
+[rpi]
+button_gpio_port_number = 17
+indicator_gpio_port_number = 18
+flash = true
+
 # Users = Password
 [users]
 admin = "admin"

configuration/config.toml.sample

@@ -5,6 +5,12 @@
 vendor_id = "0x04b8"
 device_id = "0x0e28"
 
+# Raspberry Pi Configuration
+[rpi]
+button_gpio_port_number = 17
+indicator_gpio_port_number = 18
+flash = true
+
 # Users = Password
 [users]
 admin = "admin"

requirements.txt

@@ -1,36 +1,36 @@
-Adafruit_Thermal==1.1.0
-appdirs==1.4.4
-argcomplete==2.0.6
-cffi==1.17.1
-click==8.1.8
-commonmark==0.9.1
-cryptography==45.0.4
-Deprecated==1.2.18
-escpos==2.0.0
-Flask==2.1.3
-Flask-Limiter==2.4.5.1
-future==0.18.3
-itsdangerous==2.1.2
-Jinja2==3.1.6
-limits==2.6.3
-MarkupSafe==2.1.5
-numpy==2.3.0
-packaging==21.3
-pillow==11.2.1
-pycparser==2.22
-Pygments==2.12.0
-pyparsing==3.0.9
-pyserial==3.5
-python-barcode==0.13.1
-pyusb==1.2.1
-PyYAML==6.0.2
-qrcode==7.3.1
-rich==12.4.4
-setuptools==80.9.0
-six==1.16.0
-toml==0.10.2
-typing_extensions==4.2.0
-Unidecode==1.3.8
-viivakoodi==0.8.0
-Werkzeug==2.1.2
-wrapt==1.14.1
+Adafruit_Thermal>=1.1.0
+appdirs>=1.4.4
+argcomplete>=2.0.6
+cffi>=1.17.1
+click>=8.1.8
+commonmark>=0.9.1
+cryptography>=45.0.4
+Deprecated>=1.2.18
+escpos>=2.0.0
+Flask>=2.1.3
+Flask-Limiter>=2.4.5.1
+future>=0.18.3
+itsdangerous>=2.1.2
+Jinja2>=3.1.6
+limits>=2.6.3
+MarkupSafe>=2.1.5
+numpy>=2.3.0
+packaging>=21.3
+pillow>=11.2.1
+pycparser>=2.22
+Pygments>=2.12.0
+pyparsing>=3.0.9
+pyserial>=3.5
+python-barcode>=0.13.1
+pyusb>=1.2.1
+PyYAML>=6.0.2
+qrcode>=7.3.1
+rich>=12.4.4
+setuptools>=80.9.0
+six>=1.16.0
+toml>=0.10.2
+typing_extensions>=4.2.0
+Unidecode>=1.3.8
+viivakoodi>=0.8.0
+Werkzeug>=2.1.2
+wrapt>=1.14.1

src/main.py

@@ -6,11 +6,17 @@
 # Then we build the API around Flask,
 # Then we build the web interface, using the simple Jinja2 templating.
 
+# We support two modes :
+# The first is a simple mode, where a computer, connected to a thermal printer, runs this program and exposes a web interface that makes use of the client's camera
+# The seconde is booth mode, where a Raspberry Pi is connected to a thermal printer, a button and a flash. The web interface exists but may not be used, as the press of the button with take a picture and activate the flash while simply informing the web page.
+
 # Following are the librairies we import,
 from flask import Flask, request, render_template, flash, abort, redirect, url_for, make_response, jsonify       # Used for the web framework
+from flask_socketio import SocketIO
 from flask_limiter import Limiter
 from flask_limiter.util import get_remote_address
 from printer import Printer             # The wrapper for the printer class
+from raspberry import Raspberry         # The Raspberry pi control Class
 from web import Web                     # Wrapper for the web routes and API
 import toml                             # Used for the config file parsing
 import pprint                           # To pretty print JSON
@@ -19,6 +25,7 @@ import os                               # For VARS from the shell.
 # Variables
 
 app = Flask(__name__)
+socketio = SocketIO(app)
 ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'gif'}
 
 # Load the configuration file
@@ -36,6 +43,7 @@ except Exception as e:
     exit(-1)
 
 app.logger.debug("Config file loaded !")
+
 # Define the USB connections here.
 vendor_id = configuration_file["printer"]["vendor_id"]
 device_id = configuration_file["printer"]["device_id"]
@@ -68,18 +76,28 @@ app.config['TEMPLATES_AUTO_RELOAD'] = True
 printer = Printer(app,0x04b8, 0x0e28)
 printer.init_printer()
 
-# Web routes
+# Find out if we are running on a Raspberry Pi
+rpi = Raspberry(printer, app, socketio, configuration_file['rpi']['button_gpio_port_number'], configuration_file['rpi']['indicator_gpio_port_number'], configuration_file['rpi']['flash'] )
+RASPBERRY_PI_CONNECTED =  rpi.is_raspberry_pi()
+if RASPBERRY_PI_CONNECTED:
+    rpi.initialise_gpio()
+
+
+#############################################################
+#  Web & API  routes
+#############################################################
+
+
 web = Web(app, printer)
 
 if __name__ == "__main__":
     app.run(ssl_context='adhoc')
 
-
 limiter = Limiter(
-    app,
-    key_func=get_remote_address,
+    get_remote_address,
+    app=app,
     default_limits=["1500 per day", "500 per hour"]
-)
+    )
 
 @app.route('/')
 @limiter.limit("1/second", override_defaults=False)
@@ -116,16 +134,12 @@ def api_print_sms():
         txt = request.form["txt"]
         sign = request.form["signature"]
     except Exception as e:
-        app.logger.error(str(e) + " - Whoops, no forms submitted or missing signature.")
-        return jsonify({'message': 'Error getting the information from the form :' + e}), 500
+        app.logger.error("Whoops, no forms submitted or missing signature :" + str(e))
+        flash("Whoops, no forms submitted or missing signature : " + str(e))
+        return redirect(url_for("index"))
 
-    try:
-        web.print_sms(txt,sign)
-    except Exception as e:
-        return jsonify({'message': 'Error printing the SMS:' + e}), 500
-
-
-    return jsonify({'message': 'Message printed'}), 200
+    web.print_sms(txt,sign)
+    return redirect(url_for("index"))
 
 @app.route('/api/print/img', methods=['POST'])
 @limiter.limit("6/minute", override_defaults=False)
@@ -135,40 +149,61 @@ def api_print_image():
     try:
         sign = request.form["signature"]
     except Exception as e:
-        app.logger.error(str(e) + " - Whoops, no forms submitted or missing signature.")
-        return jsonify({'message': 'Error getting the information from the form :' + e}), 500
+        app.logger.error("Whoops, no forms submitted or missing signature :" + str(e))
+        flash("Whoops, no forms submitted or missing signature : " + str(e))
+        return redirect(url_for("index"))
+
 
 
     if request.method == 'POST':
         # check if the post request has the file part
         try:
             if 'img' not in request.files:
-                app.logger.error("No file found. Did you use the good form ?")
-                return jsonify({'message': 'No file found. Did you use the good form ?'}), 500
+                app.logger.error("Whoops, no images submitted  :" + str(e))
+                flash("Whoops, no images submitted  : " + str(e))
             else:
                 file = request.files['img']
         except Exception as e:
-            app.logger.error('Error getting the files :' + e)
-            return jsonify({'message': 'Error getting the files :' + e}), 500
+            app.logger.error('Error getting the files :' + str(e))
+            flash('Error getting the files :' + str(e))
+            return redirect(url_for("index"))
 
         # If the user does not select a file, the browser submits an
         # empty file without a filename.
         if file.filename == '':
             app.logger.error("Submitted file has no filename !")
-            return jsonify({'message': "Submitted file has no filename !" + e}), 500
+            flash("Submitted file has no filename !")
+            return redirect(url_for("index"))
+
 
         try:
             app.logger.debug("Sending the image to the printer.")
             web.print_image(file, sign)
         except Exception as e:
-            app.logger.error("The image could not be printed : " + e )
-            return jsonify({'message': "The image could not be printed :" + e}), 500
+            app.logger.error("The image could not be printed because : " + str(e) )
+            flash("The image could not be printed because : " + str(e))
+            return redirect(url_for("index"))
 
     else:
-        return jsonify({'message': "Method Not Allowed, please POST"}), 403
-        app.logger.debug('Bad access type to this API, please POST')
+        app.logger.error("Method not allowed")
+        flash("Method not allowed")
+        return redirect(url_for("index"))
+
+    flash('Picture printed ! '),
+    return redirect(url_for("index"))
+
+
+@app.route('/api/camera/picture')
+def camera_picture():
+    # Returns a picture taken by the camera
+    if RASPBERRY_PI_CONNECTED:
+        try:
+            return rpi.camera_picture()
+        except Exception as e:
+            return jsonify({'message': 'Error getting the stream : ' + e}), 500
+    else:
+        return jsonify({'message': 'No camera present'}), 500
 
-    return jsonify({'message': 'Message printed'}), 200
 
 
 @app.route('/login')
@@ -186,7 +221,7 @@ def logout_page():
 @app.errorhandler(429)
 def ratelimit_handler(e):
     flash("Rate limit reached, please slow down :) ( Currently at "+ e.description + ")", 'error')
-    app.logger.debug('Rate limit reached ' + e)
+    app.logger.debug('Rate limit reached ' + str(e.description))
     return redirect(url_for("index"))
 
 @app.route("/ping")
@@ -195,3 +230,16 @@ def ping():
     flash("🏓 Pong !",'info')
     app.logger.debug('🏓 Pong !')
     return redirect(url_for("index"))
+
+@socketio.on('ping')
+def handle_message(data):
+    app.logger.debug('Received : ' + str(data))
+    socketio.emit('pong',"Pong !")
+
+@socketio.on('get_camera_status')
+def camera_status():
+    app.logger.debug('Client asked if we had a camera')
+    if RASPBERRY_PI_CONNECTED:
+        socketio.emit("camera_status", True)
+    else:
+        socketio.emit("camera_status", False)

src/printer.py

@@ -48,16 +48,14 @@ class Printer(object):
                 self.app.logger.error('Printer has no more paper, aborting...')
                 flash("No more paper on the printer. Sorry.",category='error')
                 self.printer.close()
-                return False
+                raise Exception("No more paper in the printer")
             case 1:
                 self.app.logger.warning('Printer needs paper to be changed very soon ! ')
                 flash('Printer needs paper to be changed very soon ! ', category='info')
                 self.printer.close()
-                return True
             case 2:
                 self.app.logger.debug('Printer has paper, good to go')
                 self.printer.close()
-                return True
 
     def init_printer(self):
 
@@ -99,57 +97,55 @@ class Printer(object):
         self.ready = True;
         self.printer.close();
 
-        if not self.check_paper():
-            return False
+        self.check_paper()
 
         return True
 
-    def print_sms(self, msg, signature) -> bool:
+    def print_sms(self, msg, signature) -> None:
         clean_msg = str(msg)
         clean_signature = str(signature)
 
-        if not self.check_paper():
-            return False
-
-        if len(clean_msg) > 256 or len(clean_msg) < 3 :
+        if len(clean_msg) > 4096 or len(clean_msg) < 3 :
             self.app.logger.warning("Could not print message of this length: " + str(len(clean_msg)))
-            flash("Could not print message of this length :" + str(len(clean_msg)) + ", needs to between 3 and 256 caracters long.",category='error')
-            return False
+            raise Exception("Could not print message of this length :" + str(len(clean_msg)) + ", needs to between 3 and 4096 caracters long.")
 
         if len(signature) > 256 or len(signature) < 3:
-            self.app.logger.warning("Could not print message without a signature.")
-            flash("Could not print message without a signature.",category='error')
-            return False
+            self.app.logger.warning("Could not print signature of this length: " + str(len(clean_signature)))
+            raise Exception("Could not print signature of this length :" + str(len(clean_signature)) + ", needs to between 3 and 256 caracters long.")
 
-        if not os.getenv('LIPY_DEBUG') == True:
-            try:
-                self.printer.open(self.usb_args);
-                self.printer.set(align='left', font='a', bold=False, underline=0, width=1, height=1, density=8, invert=False, smooth=True, flip=False, double_width=False, double_height=False, custom_size=False)
-                self.printer.textln("> Printed by LittlePrinter | https://n07070.xyz/articles/littleprynter")
-                self.printer.textln(clean_msg)
-                self.printer.set(align='left', font='b', bold=False, underline=1, width=1, height=1, density=9, invert=False, smooth=True, flip=False, double_width=False, double_height=False, custom_size=False)
-                self.printer.textln("> " + clean_signature + " @ " + strftime("%Y-%m-%d %H:%M:%S", gmtime()))
-                self.printer.cut()
-                self.printer.close
-            except Exception as e:
-                flash("Unable to print because : " + e)
+        self.check_paper()
+
+        try:
+            self.printer.open(self.usb_args);
+            self.printer.set(align='left', font='a', bold=False, underline=0, width=1, height=1, density=8, invert=False, smooth=True, flip=False, double_width=False, double_height=False, custom_size=False)
+            self.printer.set(align='left', font='a', bold=True, underline=1, width=1, height=1, density=6, invert=False, smooth=True, flip=False, double_width=False, double_height=False, custom_size=False)
+            self.printer.textln(clean_msg)
+            self.printer.textln("")
+            self.printer.set(align='left', font='b', bold=False, underline=1, width=1, height=1, density=9, invert=False, smooth=True, flip=False, double_width=False, double_height=False, custom_size=False)
+            self.printer.textln("> " + clean_signature + " @ " + strftime("%Y-%m-%d %H:%M:%S", gmtime()))
+            self.printer.textln("")
+            self.printer.textln("Printed by LittlePrinter ")
+            self.printer.textln("n07070.xyz/articles/littleprynter")
+            self.printer.textln("")
+            self.printer.cut()
+            self.printer.close()
+        except Exception as e:
+            self.app.logger.error("Unable to print because : " + str(e))
+            raise e
 
         flash("Message printed : " + clean_msg ,category='info')
         return True
 
-    def print_img(self, path, sign):
+    def print_img(self, path, sign) -> None:
         clean_signature = str(sign)
 
-        if len(clean_signature) > 256 or len(clean_signature) < 3:
-            self.app.logger.warning("Could not print message without a signature.")
-            flash("Could not print message without a signature.",category='error')
-            return False
-
+        if len(sign) > 256 or len(sign) < 3:
+            self.app.logger.warning("Could not print signature of this length: " + str(len(clean_signature)))
+            raise Exception("Could not print signature of this length :" + str(len(clean_signature)) + ", needs to between 3 and 256 caracters long.")
 
         if not os.path.isfile(str(path)):
             self.app.logger.warning("File does not exist : " + str(path))
-            flash('The file path for this image :' + str(path) + " wasn't found. Please try again.", 'error')
-            return False
+            raise Exception('The file path for this image :' + str(path) + " wasn't found. Please try again.")
         else:
             self.app.logger.debug("Printing file from " + str(path))
 
@@ -157,12 +153,15 @@ class Printer(object):
             self.app.logger.debug("Proccessing the image")
             path = process_image(self, path)
         except Exception as e:
-            flash(str(e))
             self.app.logger.error(str(e))
+            raise e
+
 
         try:
+            self.check_paper()
             self.printer.open(self.usb_args)
-            self.printer.textln("> Printed by LittlePrinter | https://n07070.xyz/articles/littleprynter")
+            self.printer.textln("Printed by LittlePrinter ")
+            self.printer.textln("n07070.xyz/articles/littleprynter")
             self.printer.textln("> " + clean_signature + " @ " + strftime("%Y-%m-%d %H:%M:%S", gmtime()))
             self.printer.image(path)
             self.printer.cut()
@@ -170,16 +169,15 @@ class Printer(object):
             self.app.logger.debug("Printed an image : " + str(path))
             os.remove(path)
             self.app.logger.debug("Removed image.")
-            return True
         except Exception as e:
             self.printer.close()
-            flash(str(e),'error')
-            return False
+            self.app.logger.error(str(e))
+            raise e
 
 def process_image(self, path):
     brightness_factor = 1.5  # Used only if image is too dark
-    brightness_threshold = 150  # Brightness threshold (0–255)
-    contrast_factor = 1.2         # Less than 1.0 = lower contrast
+    brightness_threshold = 100  # Brightness threshold (0–255)
+    contrast_factor = 0.6         # Less than 1.0 = lower contrast
     max_width = 575
     max_height = 1000
 

src/raspberry.py

@@ -1,4 +1,106 @@
-from printer import Printer
+from flask_socketio import SocketIO
+from gpiozero import Button, LED
+from time import sleep
+import io                               # To check if we are on a Raspberry Pi
+import subprocess
 
 class Raspberry(object):
-    pass
+    """
+    This class will manage three things :
+    - Connecting to a USB webcam
+    - Managing a push button
+    - Activating a flash ( or light )
+    - Flash an indicator light
+
+    """
+    def __init__(self, printer, app, socketio, button_gpio_port_number, indicator_gpio_port_number, is_flash_present,):
+        self.printer = printer
+        self.socketio = socketio
+        self.app = app
+
+        self.is_flash_present = is_flash_present
+        self.button_gpio = button_gpio_port_number
+        self.led_gpio = indicator_gpio_port_number
+        self.image_path = self.app.config['UPLOAD_FOLDER'] + '/image.jpg'
+
+    def initialise_gpio(self):
+
+        self.button = Button(self.button_gpio)
+        self.led = LED(self.led_gpio)
+
+        button.when_pressed = self.on_button_pressed()
+
+
+    def is_raspberry_pi(self, raise_on_errors=False):
+        # Check if we are running on a raspberry pi
+        try:
+            with io.open('/proc/cpuinfo', 'r') as cpuinfo:
+                found = False
+                for line in cpuinfo:
+                    if line.startswith('Hardware'):
+                        found = True
+                        label, value = line.strip().split(':', 1)
+                        value = value.strip()
+                        if value not in (
+                            'BCM2708',
+                            'BCM2709',
+                            'BCM2711',
+                            'BCM2835',
+                            'BCM2836'
+                        ):
+                            self.app.logger.debug('This system does not appear to be a Raspberry Pi.')
+                            return False
+
+                if not found:
+                    self.app.logger.error('Couldn\'t get sufficient hardware information from /proc/cpuinfo, Unable to determine if we are on a Raspberry Pi.')
+                    return False
+        except IOError:
+            self.app.logger.error('Unable to open `/proc/cpuinfo`.')
+            return False
+
+        self.app.logger.debug('It seems we are on a Raspberry Pi')
+        return True
+
+    def take_picture(self):
+        # return a path to a picture
+        try:
+            subprocess.run(['fswebcam', '--no-banner', self.image_path])
+        except Exception as e:
+            self.app.logger.error('Unable to take a picture :' + e)
+            raise e
+        return True
+
+    def flash(state):
+        if state:
+            # turn on the flash
+            pass
+        else:
+            # turn off the flash
+            pass
+
+    def flash_indicator(self):
+        # The indicator will flash three times before return true
+        self.led.on()
+        sleep(0.1)
+        self.led.off()
+        sleep(1)
+        self.led.on()
+        sleep(0.1)
+        self.led.off()
+        sleep(1)
+        self.led.on()
+        sleep(0.1)
+        self.led.off()
+
+    def on_button_pressed():
+        self.socketio.emit('button_pressed')  # Notify clients that a button has been pressed on the raspberry pi
+        self.flash_indicator()  # The indicator will flash a countdown LED
+        self.flash(True)
+        try:
+            self.take_picture()
+            self.printer.print_image(self.image_path)
+        except Exception as e:
+            app.logger.error("Could not take a picture after the button press : " + e)
+            self.led.on()
+        self.flash(False)
+        self.socketio.emit('picture_taken')  # Notify clients that a picture has been taken

src/static/js/webcam.js

@@ -1,39 +1,159 @@
 let streaming;
 var current_stream;
 var current_camera_is;
+var supports_facing_mode;
+var camera_options;
 
 var width = document.getElementById("video").parentNode.parentElement.clientWidth;
 var height = width / (4 / 3);
+var socket = io();
 
-function startup(){
+socket.on('connect', function() {
+    socket.emit('ping', {data: 'I\'m connected!'});
+    console.log("Sent a ping to the server :)");
+});
+
+
+socket.on('pong', () => {
+  console.log('Received pong back ! ');
+});
+
+socket.on('new_image', () => {
+    console.log("Received new image event");
+    const img = document.getElementById('snapshot');
+    img.src = '/image?' + new Date().getTime();  // Bust cache
+});
+
+
+async 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 ){
+  console.log("Checking for client webcam capabilities");
+  // We have a camera_options dictionnary in return, or false if the device does not support webcams.
+  let client_webcam_capabilities = await check_webcam_capabilies();
+
+
+  if ( client_webcam_capabilities != false ){
+    get_webcam(client_webcam_capabilities);
     setup_events();
     clear_canvas();
   } else {
-    no_webcam_error();
-    console.log("Seems like it's impossible to get a webcam.");
+    console.log("Checking for server webcam capabilities");
+    let server_webcam_capabilities = await check_server_camera();
+    if (server_webcam_capabilities === true ){
+      console.log("The server has a camera, using it.");
+      console.log("TODO");
+    }
+    else {
+      no_webcam_error();
+      console.log("Seems like it's impossible to get a webcam from the client nor the server.");
+    }
   }
 }
 
-function check_webcam(){
-  console.log("Cheking for a camera...");
-  if (get_front_webcam()) {
-    console.log("Got front camera !");
-    return true;
+async function check_webcam_capabilies(){
+  console.log("Checking for a the capabilities of the client's media devices");
+
+  // We try to start with the front facing camera,
+  // if we have no support, we switch back to a normal camera.
+  try {
+    // We first check if the navigator has a media device
+    if (!navigator.mediaDevices?.enumerateDevices) {
+      console.log("enumerateDevices() not supported.");
+      return false;
+    } else {
+      // List cameras and microphones.
+      console.log("The device has the following media devices : ")
+      await navigator.mediaDevices
+        .enumerateDevices()
+        .then((devices) => {
+          devices.forEach((device) => {
+            console.log(`${device.kind}: ${device.label} id = ${device.deviceId}`);
+          });
+        })
+        .catch((err) => {
+          console.error(`${err.name}: ${err.message}`);
+          return false;
+        });
+    }
+  } catch (e) {
+    console.log("The device does not seem to support webcams " + e);
+    return false;
   }
 
-  if (get_any_webcam()) {
-    console.log("Got a webcam !");
-    return true;
+  console.log("Checking for the supported constraints of the media devices ");
+  try {
+    const supports = navigator.mediaDevices.getSupportedConstraints();
+    if (!supports['facingMode']) {
+      throw new Error("This browser does not support facingMode!");
+    } else {
+      console.log("The device supports facing mode, selecting the front camera by default");
+      supports_facing_mode = true;
+      camera_options = {
+        video: {
+           facingMode: 'user', // Or 'environment' if we want a camera facing away
+        },
+        audio: false
+      };
+      return camera_options;
+    }
+  } catch (e) {
+    console.log("Resetting to default camera : " + e);
+    supports_facing_mode = false;
+    camera_options = {
+      video: true,
+      audio: false
+    };
+    return camera_options
   }
-  console.log("Nope");
-  return false;
+}
+
+async function get_webcam(options){
+  stop_video_streams();
+
+  try {
+    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 the webcam stream");
+
+      printButton.removeAttribute("disabled","");
+      current_stream = stream;
+      video.srcObject = stream;
+      video.setAttribute('autoplay', '');
+      video.setAttribute('muted', '');
+      video.setAttribute('playsinline', '')
+      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;
+  }
+}
+
+async function check_server_camera(){
+  console.log("Checking for a camera on the server");
+
+  await socket.emit('get_camera_status', (response) => {
+    if (response){
+      console.log("Server has a camera !");
+      return true;
+    } else {
+      console.log("The server doesn't seem to have a camera");
+      return false;
+    }
+  });
+
 }
 
 function setup_events(){
@@ -66,7 +186,7 @@ function setup_events(){
   }, false);
 
   switch_cameras.addEventListener('click', function(ev) {
-    flip_cameras();
+    flip_cameras(camera_options);
   }, false );
 
   printButton.addEventListener('click', function(ev){
@@ -137,26 +257,9 @@ function print_picture(data){
 
 }
 
-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 flip_cameras(camera_options){
+  if ( supports_facing_mode ) {
+    get_webcam((camera_options.video.facingMode === 'user' ? 'environment' : 'user'));
   }
 }
 
@@ -177,84 +280,6 @@ function stop_video_streams(){
   }
 }
 
-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.setAttribute('autoplay', '');
-      video.setAttribute('muted', '');
-      video.setAttribute('playsinline', '')
-      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.")
 

src/templates/base.html

@@ -56,4 +56,6 @@
         <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>
+            <script src="https://cdn.socket.io/4.0.0/socket.io.min.js"></script>
+
 </html>

src/templates/webcam.html

@@ -99,6 +99,7 @@
 
 </style>
 
+<script src="https://cdn.socket.io/4.0.0/socket.io.min.js"></script>
 <script type="text/javascript" src="{{ url_for('static',filename='js/webcam.js') }}"></script>
 
 <br>

src/web.py

@@ -1,4 +1,4 @@
-from flask import Flask, request
+from flask import Flask, request, flash
 from werkzeug.utils import secure_filename
 from printer import Printer
 import time
@@ -15,28 +15,27 @@ class Web(object):
     def print_sms(self, texte, sign: str):
         # TODO: verify the texte before printing it here ?
         self.app.logger.debug("Printing : " + str(texte) + " from " + str(sign))
-        if not os.getenv('LIPY_DEBUG'):
-            time.sleep(1)
+        try:
+            self.printer.print_sms(texte, sign)
+        except Exception as e:
+            self.app.logger.error(e)
+            flash("Error while printing the SMS : "+ str(e))
 
-        return self.printer.print_sms(texte, sign)
+        flash("You message has been printed :)")
 
-    def print_image(self, image, sign: str) -> bool:
+
+    def print_image(self, image, sign: str):
         self.app.logger.debug("Uploading file")
         try:
             self.app.logger.debug("Uploading file from " + str(sign))
             if self.upload_file(image):
                 self.app.logger.debug("File has been uploaded, printing...")
                 self.printer.print_img(os.path.join(self.app.config['UPLOAD_FOLDER'], secure_filename(image.filename)), sign)
-                return True
-            else:
-                return False
         except Exception as e:
             self.app.logger.error(e)
-            raise Exception
+            flash("Could not upload file." + str(e))
 
-        else:
-            flash("Could not upload file.",'error')
-            return False
+        flash("Your image has been printed :)")
 
     def login(username: str,password: str) -> bool:
         pass