Tag Archives: oauth

Log In With Apple using redirect pop-up

This tutorial demonstrates how to use oAuth to sign-in with Apple without using any library.We simply use HTTP GET request to their endpoint URL: appleid.apple.com/auth/authorize.

Just to space it up a bit, we are opening Sign-in popup in modal window using window.open but this could be done in the same window. The advantages of open it in modal window are that the user won’t be redirect to different screens and got confused of what’s going on.

Full example here

Main Web app

index.html

<html>
    <head>
      <style>

      </style>

    <script type = "text/javascript">

      var popUpObj;

      function showModalPopUp()    
      {
      popUpObj=window.open(
        "log-in-popup.html",
        "ModalPopUp",
        "toolbar=no," +
        "scrollbars=no," +
        "location=no," +
        "statusbar=no," +
        "menubar=no," +
        "resizable=0," +
        "width=500," +
        "height=640," +
        "left = 480," +
        "top=300"
      );

      popUpObj.focus();
      }   

      function receiveUserSignedInData(parsedToken) {
        console.dir(parsedToken, { depth: null });
      }

    </script>
    </head>
    <body>
    <h1>Welcome to oAuth example</h1>
    <input id="Button1" type="button" value="Log In" onclick="showModalPopUp()">
    </body>
</html>

The main app simply has a button that opens modal window with sign-in button. Line 39.

Log-In popup window

<html>
    <head>
        <style>
            #apple-auth-button {
                webkit-box-align: baseline;
                align-items: baseline;
                border-width: 0px;
                border-radius: 3px;
                box-sizing: border-box;
                display: inline-flex;
                font-size: inherit;
                font-style: normal;
                font-family: inherit;
                max-width: 100%;
                position: relative;
                text-align: center;
                text-decoration: none;
                transition: background 0.1s ease-out 0s, box-shadow 0.15s cubic-bezier(0.47, 0.03, 0.49, 1.38) 0s;
                white-space: nowrap;
                cursor: pointer;
                padding: 0px 10px;
                vertical-align: middle;
                width: 100%;
                -webkit-box-pack: center;
                justify-content: center;
                font-weight: bold;
                color: var(--ds-text,#42526E) !important;
                height: 40px !important;
                line-height: 40px !important;
                background: rgb(255, 255, 255) !important;
                box-shadow:  rgb(0 0 0 / 20%) 1px 1px 5px 0px !important           
            }
        </style>

    </head>
    <body>
        <a href="https://appleid.apple.com/auth/authorize?client_id=com.sign-in-with-apple-example-redirect-service&redirect_uri=https://www.toni-develops.com/external-files/examples/oauth-with-apple-with-redirect-step-by-step/callback.php&response_type=code id_token&state=123&scope=name email&response_mode=form_post">Sign In with Apple Simple A tag</a>

        <hr/>

        <div id="signInPanel">
            
            <form action="https://appleid.apple.com/auth/authorize?" method="get">
                <input type="hidden" id="client_id" name="client_id" value="com.sign-in-with-apple-example-redirect-service" />
                <input type="hidden" id="redirect_uri" name="redirect_uri" value="https://www.toni-develops.com/external-files/examples/oauth-with-apple-with-redirect-step-by-step/callback.php" />
                <input type="hidden" id="response_type" name="response_type" value="code id_token"/>
                <input type="hidden" id="scope" name="scope" value="name email" />
                <input type="hidden" id="response_mode" name="response_mode" value="form_post" />

                <button id="apple-auth-button" class="css-11s2kpt" type="submit" tabindex="0">
                <span class="css-1ujqpe8">
                    <img class="appleLogo" src="https://www.toni-develops.com/external-files/examples/assets/apple-logo.svg" alt="">
                </span>
                <span class="css-19r5em7"><span>Continue with Apple</span>
                </button> 
            </form>

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

This window create two sign-in entities: one is simple A tag that demonstrates how we could start sign-in redirect process by simply redirect browser to authentication service, and the second one is a button, that does the same using form submit.

Callback function

callback.php

<html>
    <head>
      <style>

      </style>
      <script type = "text/javascript">
        var id_token = "<?php echo $_POST['id_token'] ?>";


        function parseJwt (token) {
          var base64Url = token.split('.')[1];
          var base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/');
          var jsonPayload = decodeURIComponent(window.atob(base64).split('').map(function(c) {
              return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2);
          }).join(''));

          return JSON.parse(jsonPayload);
        }           

        function sendDataToMainApp() {
          var parsedToken = parseJwt(id_token);
          window.opener.receiveUserSignedInData(parsedToken);
          window.close();
        }
      </script>
    </head>
    <body onLoad="sendDataToMainApp()">

    
    
    </body>
</html>

what we just did:

Were, we get id_token from Apple authentication service, that passes this via the request type that we selected (post, fragment, get) decodes, id_token then passes it to the parent window and closes itself.

Full example here

where to go from here ?

Full Oauth flow in three different ways

Using Oauth2 to sign-in users with Apple using Java Script Library

Leave a reply

Example project here

<html>
    <head>
      <style>
        h1 {
          text-align: center;
        }

        #welcomePanel {
          display: none;
          text-align: center;
        }

        #signInPanel h2 {
          text-align: center;
          border: 1px solid silver;
        }

        #google-auth-button {
          -webkit-box-align: baseline;
          align-items: baseline;
          border-width: 0px;
          border-radius: 3px;
          box-sizing: border-box;
          display: inline-flex;
          font-size: inherit;
          font-style: normal;
          font-family: inherit;
          max-width: 100%;
          position: relative;
          text-align: center;
          text-decoration: none;
          transition: background 0.1s ease-out 0s, box-shadow 0.15s cubic-bezier(0.47, 0.03, 0.49, 1.38) 0s;
          white-space: nowrap;
          cursor: pointer;
          padding: 0px 10px;
          vertical-align: middle;
          width: 100%;
          -webkit-box-pack: center;
          justify-content: center;
          font-weight: bold;
          color: var(--ds-text,#42526E) !important;
          height: 40px !important;
          line-height: 40px !important;
          background: rgb(255, 255, 255) !important;
          box-shadow: rgb(0 0 0 / 20%) 1px 1px 5px 0px !important;
        }
      </style>
      <!-- First we have to include Apple Sign-in script -->
      <script
        type="text/javascript"
        src="https://appleid.cdn-apple.com/appleauth/static/jsapi/appleid/1/en_US/appleid.auth.js"></script>
    </head>
    <body>
      <script>

        function parseJwt (token) {
            var base64Url = token.split('.')[1];
            var base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/');
            var jsonPayload = decodeURIComponent(window.atob(base64).split('').map(function(c) {
                return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2);
            }).join(''));

            return JSON.parse(jsonPayload);
        }

        /**
         * This function will initialize the `AppleID.auth` object with parameter we pass in.
         */
       
        const initApple = () => {
          window.AppleID.auth.init({
            clientId: "com.toni-develops.sign-in-with-apple-identifier", // This is the service ID we created.
            scope: "name email", // To tell apple we want the user name and emails fields in the response it sends us.
            redirectURI: "https://www.toni-develops.com/external-files/examples/oauth-with-apple-using-js-library", // As registered along with our service ID
            state: "origin:web", // Any string of your choice that you may use for some logic. It's optional and you may omit it.
            usePopup: true, // Important if we want to capture the data apple sends on the client side.
          });
        };        
        
        
        /**
         * This function is where the magic happens.
         * This is a simple example, ideally you'll have catch block as well to handle authentication failure.
         */
        const singInApple = async () => {
          const response = await window.AppleID.auth.signIn();

          return response;
        };     
        
        initApple();


        function signInWithApple() {
          const userData = singInApple();

          userData.then( (data) => {
            console.dir(data, { depth: null });
            const result = parseJwt(data.authorization.id_token)
            console.dir(result, { depth: null });

            document.querySelector('#signInPanel').innerHTML = '<h2>Welcome ' + result.email + '</h2>';
          });
        }
      </script>
      <h1>Sign-In with Apple using Java Script library example</h1>
      <div id="signInPanel">
        <button id="google-auth-button" class="css-11s2kpt" type="button" tabindex="0" onclick="signInWithApple()">
          <span class="css-1ujqpe8">
            <img class="appleLogo" src="https://www.toni-develops.com/external-files/examples/assets/apple-logo.svg" alt="">
          </span>
          <span class="css-19r5em7"><span>Continue with Apple</span>
        </button> 
      </div>
    </body>
</html>

Sign-in with Apple prerequisite

Leave a reply

In order to add Sign-In with Apple we have to do the following:

Create an App ID.
Create a Service ID.
Register the domains for your website.

Create App ID

Navigate to https://developer.apple.com/account/resources/identifiers/add/bundleId
Select App IDs
click continue on top right

Select App and click continue

add description and Bundle ID following reverse domain recommendation by Apple

confirm and hit register

Register Service ID

Go back to https://developer.apple.com/account/resources/identifiers/add/bundleId
this time select “Service ID” and click continue

add description and identifier

select identifier that you just created

check the checkbox to configure the identifier and hit configure

add the domain and the Return URLs (Make a note of the return url since we have to add it into our Java Script code later)

where to go from here ?

Sign-in with Apple using Java Script Library

Using oAuth2.0 to sign-in with Google using redirect method

Leave a reply

No library required

In this example we have the main app (in this case my blogpost) with a Log-in button (Log in Example, above ), that redirects to the Log-In app, which on the other hand redirects to selected Log-In service (Google, Apple, Facebook, Github) passing app id an all necessary log in data.

After the user grant permissions to share requested data (email, username, real name, etc.) called scope, authentication service is calling back our app service, passing code which our service is using to make HTTP request to the provider and exchange it for JWT (Jason Web Token) containing requested user information.

Create Authorization credentials

Navigate to https://console.cloud.google.com/apis/credentials and click on the + CREATE CREDENTIALS on the top left of the page.
on Authorized Java Script Origins add the domain from where the WEB app will be served. You could use http://localhost if you like.
on Authorized Redirect URIs add authentication service callback script that Google will call to pass code that could be exchanged for JWT (JSON Web Token) containing user’s information requested.

On the top right corner you will see ClientID and App secret. Write them down since we are going to need them in our authentication service later on.

Create main WEB app and authentication service

We will create main WEB app and authentication service that main app will use. This way same authentication service could be used for different WEB aps.

(Main web app) with Log In button, that redirects to the authentication app.

Let’s get started by creating simple WEB app that will have Log In button, that will simply redirect to our log in service. I already did that in the “Log In Example” above.

index.html

<html>
  <head>
    <style>
     ...
    </style>
  </head>

  <body>
    <!-- there is no Java script involved at all -->
    <div id="log_in_wrapper">
      <button class='continue_with_google'>
        <a href='https://log-in-service-app/index.html'>
          Log In
        </a>
      </button>
    </div>
  </body>
</html>

Nothing fancy happens here. We have button that simply redirects to our authentication service, which draws log-in with buttons (with Google, Apple, Facebook, GitHub)

(Authentication app) that shows `log-in with` buttons (with Google, Apple, Facebook, GitHub)

index.php

<html>
  <head>
    <style>
      ...
    </style>
  </head>

  <body>
    <!-- there is no Java script involved at all -->
    <div id="log_in_wrapper">
      <button class='continue_with_google'>
        <a href='step-1-auth-google-get-redirect.php'>
          <img src="some-google-logo"/>
          <span>Continue with Google</span>
        </a>
      </button>
    </div>
  </body>
</html>

This is just another Web app that shows log in buttons. We could skip this step and simply have this buttons in the main WEB app.

For simplicity I only added Log In With google.

This button redirects to step-1-auth-google-get-redirect.php the first part of our authentication service.

Creating config file

<?php

// Fill these out with the values you got from Google
$googleClientID = '989056576533-mtef8cl5is5ogjh3np580ireurns7l5k.apps.googleusercontent.com';
$googleClientSecret = 'xxxxxxxxxxxxxx';

// This is the URL we'll send the user to first to get their authorization
$authorizeURL = 'https://accounts.google.com/o/oauth2/v2/auth';

// This is Google's OpenID Connect token endpoint
$tokenURL = 'https://www.googleapis.com/oauth2/v4/token';

// The main application URL. Google will pass JWT token back to the main app
$baseURL = 'https://www.toni-develops.com/external-files/examples/oauth-with-google-with-redirect-step-by-step/step-2-auth-google-redirect.php';

$usserInfoURL = 'https://www.googleapis.com/oauth2/v3/userinfo';

// the initial app url
$initialAppURL = 'https://www.toni-develops.com/2023/01/05/using-oauth2-0-to-log-in-with-google-using-redirect/';

After selecting to log-in with desired authentication provider, call backend service to prepare all necessary parameters and call selected authentication service (Google, Apple, Facebook, GitHub)

step-1-auth-google-get-redirect.php

<?php
// add Google app config params
include 'google-config.php';

// Start a session so we have session id to make sure that the redicect is instantiated by this script
$sessionId = '123';

// ####################################################
// STEP 1: Start the login process by sending the user
// to Google's authorization page, 
// and passing app params
// ####################################################


  // Generate a random hash and store in the session to make sure that 
  //$_SESSION['state'] = bin2hex(random_bytes(16));

  $params = array(
    'response_type' => 'code',
    'client_id'     => $googleClientID,
    'redirect_uri'  => $baseURL,
    'scope'         => 'openid email profile',
    'state'         => $sessionId
  );

  // Redirect the user to Google's authorization page, passing the above parameters as a GET request
  header('Location: ' . $authorizeURL . '?' . http_build_query($params));

This simply redirects to the authentication service. In this case Google, passing these parameters:

response_type – we requesting code in the response which we are going to exchange it for JWT
client_id – is the app id that we registered
redirect_url – is our authentication service url, that Google will call passing code parameter. Here we are going to exchange it for JWT In this example this is step-2-auth-google-redirect.php` script below.
scope – is the requested scope. In our example we just need user name and email: openid email profile
state – this is unique string identifier, that we will check in the callback to make sure that this sign-in workflow is originated by our script

Everything that happens in the above file, could be achieved by simply passing this url in the browser. If you examine the url, it simply passes the same get parameters and query string params.

Next step: Google calls our callback script, passing `code` which our script exchange for JWT containing user info

step-2-auth-google-redirect.php

<?php
// add Google app config params
include 'google-config.php';

// ####################################################
// Step 2: When Google redirects the user back here, 
// there will be a "code" and "state"
// parameter in the query string
// Exchange the auth code for a JWT token,
// and extract requested user data from there
// ####################################################
if(isset($_GET['code'])) {
  
  // Verify the state matches our stored state
  if(!$_GET['state'] && $_GET['state'] !== '123') {    
    die('missing state!');
  }
  
  // Exchange the auth code for a token
  $ch = curl_init($tokenURL);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query([
    'grant_type' => 'authorization_code',
    'client_id' => $googleClientID,
    'client_secret' => $googleClientSecret,
    'redirect_uri' => $baseURL,
    'code' => $_GET['code']
  ]));

  $response = curl_exec($ch);

  // $data will contain 
  // access_token, 
  // expires_in, 
  // scope, 
  // token_type, 
  // id_token - which is JWT token, containing user data according to requested scope from the initial script.
  $data = json_decode($response, true);
  //echo '<pre>';print_r($data);die("</pre>");

  // Note: You'd probably want to use a real JWT library
  // but this will do in a pinch. This is only safe to do
  // because the ID token came from the https connection
  // from Google rather than an untrusted browser redirect

  // Split the JWT string into three parts
  $jwt = explode('.', $data['id_token']);

  // Extract the middle part, base64 decode it, then json_decode it
  $IDToken = json_decode(base64_decode($jwt[1]), true);
  
  // This step is required only if we want to get extra info
  /*
  $ch = curl_init($usserInfoURL);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'Authorization: Bearer '.$data['access_token']
  ]);
  $userInfo = curl_exec($ch);
  */
  /*
  echo '<h1>Token ID</h1>';
  echo '<pre>';print_r($IDToken);echo '</pre>';
  echo '<h1>User info</h1>';
  echo '<pre>';print_r($userInfo);die('</pre>');
  */

  $params = array(
    'email'       => $IDToken['email'],
    'user_name'   => $IDToken['name'],
    'given_name'  => $IDToken['given_name'],
    'family_name'  => $IDToken['family_name']
  );

  // Redirect the user to the initial app passing user data as Query String parameters so the front end could use them.
  header('Location: ' . $initialAppURL . '?' . http_build_query($params));
}
else {
  echo 'Bad response. Missing `code` GET response';
}

line 19-30: we make curl request to Google service passing:

grant_type – authorization_code
client_id – App id
client_secret – App secret
redirect_uri – should be url registered in Authorized redirect URLs

code – this is the code returned by Google as GET parameter

Last step: We are redirecting back to the main app, passing parameters that front end needs (email, user name) as GET or POST params.

Additionally we could save the user into our database, or do some additional work before redirecting to the main app (line 76)

where to go from here ?

Full Oauth flow in three different ways

Using Oauth2 to sign-in users with Google using Google Java Script Library

Leave a reply

Example project here: Sign-in with Google using Google Java Script library

Main project

<head>
  <style>
    #signIn {
      width: 80%;
      height: 50%;
      display: none;
    }

    span {
      border: 1px solid silver;
      padding: 10px;
      cursor: pointer;
      font-size: 10px;
    }
  </style>
  <script>
    function userLoggedIn(userObject) {
      document.getElementById('signIn').style.display = 'none';
      document.getElementById('head').innerHTML = `Wellcome ${userObject.given_name} ${userObject.family_name} ! <hr/>email: ${userObject.email} `;
    }

    function showLogInPopup() {
      document.getElementById('signIn').style.display = 'block';
    }
  </script>  
</head>

<body>
  <h1 id="head">Integrating Google Sign-in for Websites with Google library. <span onclick="showLogInPopup()">Log In</span></h1>

  <iframe id="signIn" src="google-sign-in.html"></iframe>
</body>

create iFrame with the log in button

<head>
    <script src="https://accounts.google.com/gsi/client" async defer></script>
    <script>
        function userLoggedIn(credential) {
            document.getElementById('log-in-iframe').style.display = 'none';
            alert(credential);
        }
    </script>
</head>

<body>
    Log in with Google
    <div id="log-in-button">
        <div id="g_id_onload"
            data-client_id="989056576533-mtef8cl5is5ogjh3np580ireurns7l5k.apps.googleusercontent.com"
            data-context="signin"
            data-response-type="code"
            data-ux_mode="popup"
            data-login_uri="https://www.toni-develops.com/external-files/examples/oauth-with-google-with-popup/callback.php"
            data-itp_support="true"
            data-auto_prompt="false">
        </div>

        <div class="g_id_signin"
            data-type="standard"
            data-shape="rectangular"
            data-theme="filled_blue"
            data-text="signin_with"
            data-size="large"
            data-logo_alignment="left">
        </div>   
    </div>
</body>

create callback

<html>
<head>
</head>

<body>
  <pre>
  <?php
    $token = $_POST['credential'];
    $userObject = json_decode(base64_decode(str_replace('_', '/', str_replace('-','+',explode('.', $token)[1]))));
    print_r($userObject);
  ?>  
  </pre>
  <script>
  var userObject = {
    given_name : "<?php echo $userObject->given_name ?>",
    family_name : "<?php echo $userObject->family_name ?>",
    email : "<?php echo $userObject->email ?>"
  }

  function passUserObjectToParentDocument(userObject) {
    parent.userLoggedIn(userObject);
  }
  </script>
  <button onclick="passUserObjectToParentDocument(userObject)">continue</button>
</body>
</html>

Example project here: Sign-in with Google using Google Java Script library

Toni-Develops

My personal developing blog

Tag Archives: oauth

Log In With Apple using redirect pop-up

Main Web app

Log-In popup window

Callback function

Using Oauth2 to sign-in users with Apple using Java Script Library

Sign-in with Apple prerequisite

Create App ID

Register Service ID

Using oAuth2.0 to sign-in with Google using redirect method

Create Authorization credentials

Create main WEB app and authentication service

(Main web app) with Log In button, that redirects to the authentication app.

(Authentication app) that shows `log-in with` buttons (with Google, Apple, Facebook, GitHub)

Creating config file

After selecting to log-in with desired authentication provider, call backend service to prepare all necessary parameters and call selected authentication service (Google, Apple, Facebook, GitHub)

Next step: Google calls our callback script, passing `code` which our script exchange for JWT containing user info

Last step: We are redirecting back to the main app, passing parameters that front end needs (email, user name) as GET or POST params.

Using Oauth2 to sign-in users with Google using Google Java Script Library

Main Web app

Log-In popup window

Callback function

Create App ID

Register Service ID

Create Authorization credentials

Create main WEB app and authentication service

(Main web app) with Log In button, that redirects to the authentication app.

(Authentication app) that shows log-in with buttons (with Google, Apple, Facebook, GitHub)

Creating config file

After selecting to log-in with desired authentication provider, call backend service to prepare all necessary parameters and call selected authentication service (Google, Apple, Facebook, GitHub)

Next step: Google calls our callback script, passing code which our script exchange for JWT containing user info

Last step: We are redirecting back to the main app, passing parameters that front end needs (email, user name) as GET or POST params.

(Authentication app) that shows `log-in with` buttons (with Google, Apple, Facebook, GitHub)

Next step: Google calls our callback script, passing `code` which our script exchange for JWT containing user info