frontend/index.html

<!DOCTYPE html>
<!--
Copyright (c) 2016 Google Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<html>
<head>
  <meta charset=utf-8/>
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Firebase Cloud Messaging Example</title>

  <!-- Material Design Theming -->
  <link rel="stylesheet" href="https://code.getmdl.io/1.1.3/material.orange-indigo.min.css">
  <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
  <script defer src="https://code.getmdl.io/1.1.3/material.min.js"></script>

  <link rel="stylesheet" href="main.css">

  <link rel="manifest" href="/manifest.json">
</head>
<body>
<div class="demo-layout mdl-layout mdl-js-layout mdl-layout--fixed-header">

  <!-- Header section containing title -->
  <header class="mdl-layout__header mdl-color-text--white mdl-color--light-blue-700">
    <div class="mdl-cell mdl-cell--12-col mdl-cell--12-col-tablet mdl-grid">
      <div class="mdl-layout__header-row mdl-cell mdl-cell--12-col mdl-cell--12-col-tablet mdl-cell--8-col-desktop">
        <h3>Firebase Cloud Messaging</h3>
      </div>
    </div>
  </header>

  <main class="mdl-layout__content mdl-color--grey-100">
    <div class="mdl-cell mdl-cell--12-col mdl-cell--12-col-tablet mdl-grid">

      <!-- Container for the Table of content -->
      <div class="mdl-card mdl-shadow--2dp mdl-cell mdl-cell--12-col mdl-cell--12-col-tablet mdl-cell--12-col-desktop">
        <div class="mdl-card__supporting-text mdl-color-text--grey-600">
          <!-- div to display the generated Instance ID token -->
          <div id="token_div" style="display: none;">
            <h4>Instance ID Token</h4>
            <p id="token" style="word-break: break-all;"></p>
            <button class="mdl-button mdl-js-button mdl-button--raised mdl-button--colored"
                    onclick="deleteToken()">Delete Token</button>
          </div>
          <!-- div to display the UI to allow the request for permission to
               notify the user. This is shown if the app has not yet been
               granted permission to notify. -->
          <div id="permission_div" style="display: none;">
            <h4>Needs Permission</h4>
            <p id="token"></p>
            <button class="mdl-button mdl-js-button mdl-button--raised mdl-button--colored"
                    onclick="requestPermission()">Request Permission</button>
          </div>
          <!-- div to display messages received by this app. -->
          <div id="messages"></div>
        </div>
      </div>

    </div>
  </main>
</div>
<!-- Firebase -->
<!-- ********************************************************
     * TODO(DEVELOPER): Update Firebase initialization code:
        1. Go to the Firebase console: https://console.firebase.google.com/
        2. Choose a Firebase project you've created
        3. Click "Add Firebase to your web app"
        4. Replace the following initialization code with the code from the Firebase console:
-->
<!-- START INITIALIZATION CODE -->
<script src="https://www.gstatic.com/firebasejs/4.1.2/firebase.js"></script>
<script>
  // Initialize Firebase
  var config = {
    apiKey: "AIzaSyA4Xr1uPXcePdvUSx6JS38iyQDCsP_q7NA",
    authDomain: "fcm-test-88425.firebaseapp.com",
    databaseURL: "https://fcm-test-88425.firebaseio.com",
    storageBucket: "fcm-test-88425.appspot.com",
    messagingSenderId: "343960876538"
  };
  firebase.initializeApp(config);
</script>
<!-- END INITIALIZATION CODE -->
<!-- ******************************************************** -->
<script>
  // [START get_messaging_object]
  // Retrieve Firebase Messaging object.
  const messaging = firebase.messaging();
  // [END get_messaging_object]

  // IDs of divs that display Instance ID token UI or request permission UI.
  const tokenDivId = 'token_div';
  const permissionDivId = 'permission_div';

  // [START refresh_token]
  // Callback fired if Instance ID token is updated.
  messaging.onTokenRefresh(function() {
    messaging.getToken()
    .then(function(refreshedToken) {
      console.log('Token refreshed.');
      // Indicate that the new Instance ID token has not yet been sent to the
      // app server.
      setTokenSentToServer(false);
      // Send Instance ID token to app server.
      sendTokenToServer(refreshedToken);
      // [START_EXCLUDE]
      // Display new Instance ID token and clear UI of all previous messages.
      resetUI();
      // [END_EXCLUDE]
    })
    .catch(function(err) {
      console.log('Unable to retrieve refreshed token ', err);
      showToken('Unable to retrieve refreshed token ', err);
    });
  });
  // [END refresh_token]

  // [START receive_message]
  // Handle incoming messages. Called when:
  // - a message is received while the app has focus
  // - the user clicks on an app notification created by a sevice worker
  //   `messaging.setBackgroundMessageHandler` handler.
  messaging.onMessage(function(payload) {
    console.log("Message received. ", payload);
    // [START_EXCLUDE]
    // Update the UI to include the received message.
    appendMessage(payload);
    // [END_EXCLUDE]
  });
  // [END receive_message]

  function resetUI() {
    clearMessages();
    showToken('loading...');
    // [START get_token]
    // Get Instance ID token. Initially this makes a network call, once retrieved
    // subsequent calls to getToken will return from cache.

    console.log("getting token")
    messaging.getToken().then((resp) => {
      console.log(resp)
    })
    messaging.getToken()
    .then(function(currentToken) {
      console.log("Got current token")
      if (currentToken) {
        sendTokenToServer(currentToken);
        updateUIForPushEnabled(currentToken);
      } else {
        // Show permission request.
        console.log('No Instance ID token available. Request permission to generate one.');
        // Show permission UI.
        updateUIForPushPermissionRequired();
        setTokenSentToServer(false);
      }
    })
    .catch(function(err) {
      console.log('An error occurred while retrieving token. ', err);
      showToken('Error retrieving Instance ID token. ', err);
      setTokenSentToServer(false);
    });
    console.log("End get token")

  }
  // [END get_token]

  function showToken(currentToken) {
    // Show token in console and UI.
    var tokenElement = document.querySelector('#token');
    console.log(tokenElement)
    console.log(currentToken)
    tokenElement.textContent = currentToken;
  }

  // Send the Instance ID token your application server, so that it can:
  // - send messages back to this app
  // - subscribe/unsubscribe the token from topics
  function sendTokenToServer(currentToken) {
    if (!isTokenSentToServer()) {
      console.log('Sending token to server...');
      // TODO(developer): Send the current token to your server.
      fetch('http://localhost:8000/devices/', {
        method: "POST",
        headers: {
            'Content-Type': 'application/json'
          },
        body: JSON.stringify({
          'registration_id': currentToken,
          'type': 'web',
        }),
        credentials: "include",
      }).then(function(response) {
        console.log(response);
      })
      setTokenSentToServer(true);
    } else {
      console.log('Token already sent to server so won\'t send it again ' +
          'unless it changes');
    }

  }

  function isTokenSentToServer() {
    if (window.localStorage.getItem('sentToServer') == 1) {
          return true;
    }
    return false;
  }

  function setTokenSentToServer(sent) {
    if (sent) {
      window.localStorage.setItem('sentToServer', 1);
    } else {
      window.localStorage.setItem('sentToServer', 0);
    }
  }

  function showHideDiv(divId, show) {
    const div = document.querySelector('#' + divId);
    if (show) {
      div.style = "display: visible";
    } else {
      div.style = "display: none";
    }
  }

  function requestPermission() {
    console.log('Requesting permission...');
    // [START request_permission]
    messaging.requestPermission()
    .then(function() {
      console.log('Notification permission granted.');
      // TODO(developer): Retrieve an Instance ID token for use with FCM.
      // [START_EXCLUDE]
      // In many cases once an app has been granted notification permission, it
      // should update its UI reflecting this.
      resetUI();
      // [END_EXCLUDE]
    })
    .catch(function(err) {
      console.log('Unable to get permission to notify.', err);
    });
    // [END request_permission]
  }

  function deleteToken() {
    // Delete Instance ID token.
    // [START delete_token]
    messaging.getToken()
    .then(function(currentToken) {
      messaging.deleteToken(currentToken)
      .then(function() {
        console.log('Token deleted.');
        setTokenSentToServer(false);
        // [START_EXCLUDE]
        // Once token is deleted update UI.
        resetUI();
        // [END_EXCLUDE]
      })
      .catch(function(err) {
        console.log('Unable to delete token. ', err);
      });
      // [END delete_token]
    })
    .catch(function(err) {
      console.log('Error retrieving Instance ID token. ', err);
      showToken('Error retrieving Instance ID token. ', err);
    });

  }

  // Add a message to the messages element.
  function appendMessage(payload) {
    const messagesElement = document.querySelector('#messages');
    const dataHeaderELement = document.createElement('h5');
    const dataElement = document.createElement('pre');
    dataElement.style = 'overflow-x:hidden;'
    dataHeaderELement.textContent = 'Received message:';
    dataElement.textContent = JSON.stringify(payload, null, 2);
    messagesElement.appendChild(dataHeaderELement);
    messagesElement.appendChild(dataElement);
  }

  // Clear the messages element of all children.
  function clearMessages() {
    const messagesElement = document.querySelector('#messages');
    while (messagesElement.hasChildNodes()) {
      console.log("Has children")
      messagesElement.removeChild(messagesElement.lastChild);
    }
  }

  function updateUIForPushEnabled(currentToken) {
    showHideDiv(tokenDivId, true);
    showHideDiv(permissionDivId, false);
    showToken(currentToken);
  }

  function updateUIForPushPermissionRequired() {
    showHideDiv(tokenDivId, false);
    showHideDiv(permissionDivId, true);
  }

  resetUI();
</script>
</body>
</html>