# Google APIs Client Library

{% hint style="success" %}
Refer at [github](https://github.com/techkoson/generic-code/tree/main/PHP/googleLogin) for template (updated at 24 OCT 2023)
{% endhint %}

The [Google API Client Library](https://github.com/googleapis/google-api-php-client#composer) enables you to work with Google APIs such as Gmail, Drive or YouTube on your serve.

## Installation

### Composer

You can use [Composer](https://getcomposer.org/) or simply Download the Release. Follow the [installation instructions](https://getcomposer.org/doc/00-intro.md) if you do not already have composer installed.

Once composer is installed, execute the following command in your project root to install this library:

```
composer require google/apiclient
```

Finally, be sure to include the autoloader at login\_google.php:

```php
require_once 'vendor/autoload.php';
```

\\

## Google Cloud Console Setup

Open [Google Cloud Console](https://console.cloud.google.com/), Select the **\[button]** on the left upper corner and create a new project.

<figure><img src="/files/52VxXHoBRasr4gP4d8vg" alt=""><figcaption></figcaption></figure>

Select **\[APIs and services]**

<figure><img src="/files/3CwpPcyK0IfoswpKdxCS" alt=""><figcaption></figcaption></figure>

Select **\[OAuth consent screen]**, select **\[External]** as User Type, and **\[Create]**

<figure><img src="/files/x3CyB5pQcIPeq4fh2EKQ" alt=""><figcaption></figcaption></figure>

The label which has \* is compulsary to fill in, etc **\[App name]**, **\[User support email]** and **\[Email address]**. Other is optional and can left empty.

<figure><img src="/files/wIfdkJ60pyICy9oVm6jv" alt=""><figcaption></figcaption></figure>

You can leave it blank at this **\[Scope]** page

<figure><img src="/files/Ytsp7DsAC3jFsomEueOR" alt=""><figcaption></figcaption></figure>

You can leave it blank at this **\[Test user]** page.

<figure><img src="/files/CEHF4TDnzR3Mq1wjFUOy" alt=""><figcaption></figcaption></figure>

Check the data fill in, if nothing wrong, then **\[BACK TO DASHBOARRD]**

<figure><img src="/files/ELVwEVCnJpZeLzNbrOlW" alt=""><figcaption></figcaption></figure>

Remember to set the publishing status to publish by clicking **\[PUBLISH APP]**.\
Noted: If you were not set to publish, then you have to add your test user email account to able use the google API

<figure><img src="/files/F7x7dtK69ObpwJcxXeNq" alt=""><figcaption></figcaption></figure>

Select Credentials, then **\[CREATE CREDENTIALS]** >> **\[OAuth client ID]**

<figure><img src="/files/tGwgWxUGJtsyUPd0o6UO" alt=""><figcaption></figcaption></figure>

Select **\[Application type]** as Web application, fill in the **\[Name]** and **\[Authorised redirect URLs]** of your login page. In my case, i build my login page at *<http://localhost:3000/login\\_google.php>*.

<figure><img src="/files/wNW8prysTbjYmpErW3Sx" alt=""><figcaption></figcaption></figure>

Copy the **\[client ID]** and **\[Client Secret]** here. It will be using later on.

<figure><img src="/files/Zrh3t5BddUYVOfsfahMX" alt=""><figcaption></figcaption></figure>

## Implementation on Your Website

### `login_google.php`

replace the <mark style="color:red;">$clientID</mark> and <mark style="color:red;">$clientSecret</mark> to your **\[client ID]** and **\[Client Secret]**

```php
<?php
// Include config file
require_once 'vendor/autoload.php';


// Google Login Start  ------------------------------------------------------------------------------------------------------------------------

// Initialize Google API client
$clientID = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';
$clientSecret = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';
$redirectUrl = 'http://localhost:3000/login_google.php';
$client = new Google\Client();
$client->setClientId($clientID);
$client->setClientSecret($clientSecret);
$client->setRedirectUri($redirectUrl);
$client->addScope('profile');
$client->addScope('email');

//Create a URL to obtain user authorization
// If user is not authenticated, redirect to Google sign-in page
if (!isset($_GET['code'])) {
    $auth_url = $client->createAuthUrl();
    header("Location:  $auth_url");
} else {
    //get user info from google account
    $token = $client->fetchAccessTokenWithAuthCode($_GET['code']);
    $client->setAccessToken($token);
    $service = new Google\Service\Oauth2($client);
    $user = $service->userinfo->get();
    $email = $user->email;
    $first_name = $user->givenName;
    $last_name = $user->familyName;
    $name =  $user->name;
    $gender = $user->gender;
    $profile_picture = $user->picture;
    $id = $user->id; //used
    $hd = $user->hd;
    $password =  password_hash($id, PASSWORD_DEFAULT); // take google id as password(after encrypted)
    $username = "$first_name, $last_name"; //the reason use format [$first name, $last name] instead of $name, is to avoid repeated username in users table


    // your action here
    echo $username;

}
```

### `button.php`

Create a login button to header to `login.php`

PHP

```php
    // if google login
    if (isset($_POST['googleLogin'])) {
        header("location: login.php");
    }
```

HTML

```html
<button name="googleLogin" class="login-with-google-btn">
  Sign in with Google
</button>
```


---

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