EGAT TRACKING SYSTEM: authen

http://appinventor.mit.edu/explore/ai2/firebase.html
<html>
<head>
  <meta charset=utf-8 />
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Email/Password Authentication 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>

  <!-- Firebase -->


<script src="https://www.gstatic.com/firebasejs/3.7.2/firebase.js"></script>
<script>
  // Initialize Firebase
  
  // Get the Firebase configuration from App Inventor via the WebViewer.WebViewString property
  var config = JSON.parse(window.AppInventor.getWebViewString());
  
  firebase.initializeApp(config);
</script>

  <script type="text/javascript">
    function tellAppInventor(message) {
        try {
            window.AppInventor.setWebViewString( message );
        } catch(e) {
            console.log("App Inventor Communication Error",e)
        }
    }
    
    /**
     * Handles the sign in button press.
     */
    function toggleSignIn() {
      if (firebase.auth().currentUser) {
        // [START signout]
        firebase.auth().signOut();
        // [END signout]
      } else {
        var email = document.getElementById('email').value;
        var password = document.getElementById('password').value;
        if (email.length < 4) {
          tellAppInventor('Please enter an email address.');
          return;
        }
        if (password.length < 4) {
          tellAppInventor('Please enter a password.');
          return;
        }
        // Sign in with email and pass.
        // [START authwithemail]
        firebase.auth().signInWithEmailAndPassword(email, password).catch(function(error) {
          // Handle Errors here.
          var errorCode = error.code;
          var errorMessage = error.message;
          // [START_EXCLUDE]
          if (errorCode === 'auth/wrong-password') {
            tellAppInventor('Wrong password.');
          } else {
            tellAppInventor(errorMessage);
          }
          console.log(error);
          document.getElementById('quickstart-sign-in').disabled = false;
          // [END_EXCLUDE]
        });
        // [END authwithemail]
      }
      document.getElementById('quickstart-sign-in').disabled = true;
    }
    /**
     * Handles the sign up button press.
     */
    function handleSignUp() {
      var email = document.getElementById('email').value;
      var password = document.getElementById('password').value;
      if (email.length < 4) {
        tellAppInventor('Please enter an email address.');
        return;
      }
      if (password.length < 4) {
        tellAppInventor('Please enter a password of 4 or more characters.');
        return;
      }
      // Sign in with email and pass.
      // [START createwithemail]
      firebase.auth().createUserWithEmailAndPassword(email, password).catch(function(error) {
        // Handle Errors here.
        var errorCode = error.code;
        var errorMessage = error.message;
        // [START_EXCLUDE]
        if (errorCode == 'auth/weak-password') {
          tellAppInventor('The password is too weak.');
        } else {
          tellAppInventor(errorMessage);
        }
        console.log(error);
        // [END_EXCLUDE]
      });
      // [END createwithemail]
    }
    /**
     * Sends an email verification to the user.
     */
    function sendEmailVerification() {
      // [START sendemailverification]
      firebase.auth().currentUser.sendEmailVerification().then(function() {
        // Email Verification sent!
        // [START_EXCLUDE]
        tellAppInventor('Email Verification Sent!');
        // [END_EXCLUDE]
      });
      // [END sendemailverification]
    }
    function sendPasswordReset() {
      var email = document.getElementById('email').value;
      // [START sendpasswordemail]
      firebase.auth().sendPasswordResetEmail(email).then(function() {
        // Password Reset Email Sent!
        // [START_EXCLUDE]
        tellAppInventor('Password Reset Email Sent!');
        // [END_EXCLUDE]
      }).catch(function(error) {
        // Handle Errors here.
        var errorCode = error.code;
        var errorMessage = error.message;
        // [START_EXCLUDE]
        if (errorCode == 'auth/invalid-email') {
          tellAppInventor(errorMessage);
        } else if (errorCode == 'auth/user-not-found') {
          tellAppInventor(errorMessage);
        }
        console.log(error);
        // [END_EXCLUDE]
      });
      // [END sendpasswordemail];
    }
    /**
     * initApp handles setting up UI event listeners and registering Firebase auth listeners:
     *  - firebase.auth().onAuthStateChanged: This listener is called when the user is signed in or
     *    out, and that is where we update the UI.
     */
    function initApp() {
      // Listening for auth state changes.
      // [START authstatelistener]
      firebase.auth().onAuthStateChanged(function(user) {
        // [START_EXCLUDE silent]
        document.getElementById('quickstart-verify-email').disabled = true;
        // [END_EXCLUDE]
        if (user) {
          // User is signed in.
          var displayName = user.displayName;
          var email = user.email;
          var emailVerified = user.emailVerified;
          var photoURL = user.photoURL;
          var isAnonymous = user.isAnonymous;
          var uid = user.uid;
          var providerData = user.providerData;

          if (emailVerified && !isAnonymous) {
                tellAppInventor( uid + ',' + email + ',' + displayName + ',' + photoURL );
            } else if (!emailVerified) {
                tellAppInventor( 'Please click the Send Email Verification button to confirm your account.' );
            }
          
          // [START_EXCLUDE]
//          document.getElementById('quickstart-sign-in-status').textContent = 'Signed in';
//          document.getElementById('quickstart-sign-in').textContent = 'Sign out';
//          document.getElementById('quickstart-account-details').textContent = JSON.stringify(user, null, '  ');
          if (!emailVerified) {
            document.getElementById('quickstart-verify-email').disabled = false;
          }
          // [END_EXCLUDE]
        } else {
          // User is signed out.
          // [START_EXCLUDE]
//          document.getElementById('quickstart-sign-in-status').textContent = 'Signed out';
//          document.getElementById('quickstart-sign-in').textContent = 'Sign in';
//          document.getElementById('quickstart-account-details').textContent = 'null';
          // [END_EXCLUDE]
        }
        // [START_EXCLUDE silent]
        document.getElementById('quickstart-sign-in').disabled = false;
        // [END_EXCLUDE]
      });
      // [END authstatelistener]
      document.getElementById('quickstart-sign-in').addEventListener('click', toggleSignIn, false);
      document.getElementById('quickstart-sign-up').addEventListener('click', handleSignUp, false);
      document.getElementById('quickstart-verify-email').addEventListener('click', sendEmailVerification, false);
      document.getElementById('quickstart-password-reset').addEventListener('click', sendPasswordReset, false);
    }
    window.onload = function() {
      initApp();
    };
  </script>
</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">
        <a href="/"><h3>Firebase Authentication</h3></a>
      </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 demo -->
      <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__title mdl-color--light-blue-600 mdl-color-text--white">
          <h2 class="mdl-card__title-text">Sign In or Sign Up</h2>
        </div>
        <div class="mdl-card__supporting-text mdl-color-text--grey-600">
          <p>Enter an email and password below and either sign in to an existing account or sign up</p>

          <input class="mdl-textfield__input" style="display:inline;width:auto;" type="text" id="email" name="email" placeholder="Email"/>
          <p/><p/>
          <input class="mdl-textfield__input" style="display:inline;width:auto;" type="password" id="password" name="password" placeholder="Password"/>
          <p/>
          <button disabled class="mdl-button mdl-js-button mdl-button--raised" id="quickstart-sign-in" name="signin">Sign In</button>
             
          <button class="mdl-button mdl-js-button mdl-button--raised" id="quickstart-sign-up" name="signup">Sign Up</button>
          <p/>
          <button class="mdl-button mdl-js-button mdl-button--raised" disabled id="quickstart-verify-email" name="verify-email">Send Email Verification</button>
          <p/>
          <button class="mdl-button mdl-js-button mdl-button--raised" id="quickstart-password-reset" name="verify-email">Send Password Reset Email</button>
          <p/>

          <!-- Container where we'll display the user details -->
          <div class="quickstart-user-details-container" style="display:none">
            Sign-in status: <span id="quickstart-sign-in-status">Unknown</span>
            <div>Authorization <code>currentUser</code> object value:</div>
            <pre><code id="quickstart-account-details">null</code></pre>
          </div>
        </div>
      </div>

    </div>
  </main>
</div>
</body>
</html>
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