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// install pip

$ wget https://bootstrap.pypa.io/get-pip.py
$ sudo python get-pip.py

// install virtualenv

$ sudo pip install virtualenv virtualenvwrapper
$ sudo rm -rf ~/.cache/pip

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$ cd ~

//download and unzip opencv

$ wget -O opencv.zip https://github.com/Itseez/opencv/archive/3.1.0.zip
$ unzip opencv.zip

//download and unzip opencv contributions

$ wget -O opencv_contrib.zip https://github.com/Itseez/opencv_contrib/archive/3.1.0.zip

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//Update existings packages

$ sudo apt-get update
$ sudo apt-get upgrade

//Install developers tools, including cmake 

$ sudo apt-get install build-essential cmake pkg-config

//Install some image I/O packages for loading images

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$ sudo apt-get install libjpeg-dev libtiff5-dev libjasper-dev libpng12-dev

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$ sudo apt-get install build-essential cmake pkg-config

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$ sudo apt-get update
$ sudo apt-get upgrade

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# app/services/PushNotifier

def self.sendPush(user)
  @message = get_message()
  if user.notification_data_id.present?
    @notification_data = NotificationData.find(user.notification_data_id)
    Webpush.payload_send(endpoint: @notification_data.endpoint,
                         message: @message,
                         p256dh: @notification_data.p256dh_key,
                         auth: @notification_data.auth_key,

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//app/views/content/index.html.erb

javascript:
   var vapidPublicKey = new Uint8Array(#{Base64.urlsafe_decode64($vapid_public).bytes});

   function checkNotifs(obj){
      if (!("Notification" in window)) {                                             //1
           console.error("This browser does not support desktop notification");
         }
         // Let's check whether notification permissions have already been granted

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// app/assets/javascript/serviceworker.js

self.addEventListener("push", function(event) {
  var title = (event.data && event.data.text().split("-")[0]) || "Message recieved";
  var body; body = event.data.text().split("-")[1];
  var tag = "push-simple-demo-notification-tag";
  var icon = 'logo.png';

  event.waitUntil(
      self.registration.showNotification(title, {

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#config/initializers/serviceworker.rb

WebPushDemo::Application.configure do
  config.serviceworker.routes.draw do
    # map to assets implicitly
    match "/serviceworker.js"
    match "/manifest.json"
    match "/logo.png"
  end
end