How to do Github login integration using PHP and OAuth

How to use PHP and OAuth for Github login integration

In the current Internet era, user login has become one of the necessary functions for almost all websites and applications. However, for user convenience, many websites choose to simplify the login process by integrating third-party login providers. In this article, we will explore how to implement Github login integration using PHP and OAuth.

OAuth (Open Authorization) is an open standard that allows users to authorize third-party applications to access their resources without providing their username and password. As the world's leading open source code management platform, Github provides an OAuth2.0 authentication mechanism for users to log in.

First, we need to apply for an OAuth application on Github. Log in to your Github account, go to "Settings" -> "Developer settings" -> "OAuth Apps", click "New OAuth App" to create a new OAuth application. Fill in the basic information of the application, including name, description, homepage URL and callback URL. In the callback URL, fill in the URL you want the user to return to after they complete their login. Once completed, Github will provide your application with a "Client ID" and "Client Secret" authorization credentials.

Next, we need to implement Github login integration in PHP. First, create a file called "github_login.php" and import the OAuth library:

<?php
require_once 'oauth/OAuth.php';

Then, define the authorization credentials and callback URL for your Github application:

$clientId = 'YOUR_CLIENT_ID';
$clientSecret = 'YOUR_CLIENT_SECRET';
$redirectUri = 'YOUR_REDIRECT_URL';

Log in at Github In integration, we need to implement two steps. First, we need to generate a login link so that the user clicks it and jumps to Github for authentication:

$baseUrl = 'https://github.com/login/oauth/authorize';
$params = array(
    'client_id' => $clientId,
    'redirect_uri' => $redirectUri,
    'scope' => 'user'
);
$loginUrl = $baseUrl . '?' . http_build_query($params);

echo '<a href="' . $loginUrl . '">使用Github账号登录</a>';

When the user clicks the login link, Github will jump the user to the specified callback URL with an authorization code. In the callback URL, we can obtain the authorization code through the following code:

$code = $_GET['code'];

Next, we need to use the authorization code to obtain the access token from Github:

$baseUrl = 'https://github.com/login/oauth/access_token';
$params = array(
    'client_id' => $clientId,
    'client_secret' => $clientSecret,
    'code' => $code,
    'redirect_uri' => $redirectUri
);
$tokenUrl = $baseUrl . '?' . http_build_query($params);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $tokenUrl);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
curl_close($ch);

$accessToken = json_decode($response, true)['access_token'];

Finally, we use the obtained Access token, obtain user information from Github:

$baseUrl = 'https://api.github.com/user';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $baseUrl);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Authorization: token ' . $accessToken));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
curl_close($ch);

$userData = json_decode($response, true);

// 输出用户信息
echo 'Github用户名：' . $userData['login'];
echo 'Github用户ID：' . $userData['id'];

Through the above steps, we have implemented the process of Github login integration using PHP and OAuth. In practical applications, we can save the obtained user information to the database and complete the logical processing of user registration or login.

To summarize, Github login integration using PHP and OAuth is not complicated. Through the OAuth2.0 authentication mechanism provided by Github, we can provide users with a fast and secure login experience. I hope this article can help you understand and implement Github login integration.

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