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Simple PHP example of using Github's OAuth 2 API
<?php
define('OAUTH2_CLIENT_ID', '');
define('OAUTH2_CLIENT_SECRET', '');
$authorizeURL = 'https://github.com/login/oauth/authorize';
$tokenURL = 'https://github.com/login/oauth/access_token';
$apiURLBase = 'https://api.github.com/';
session_start();
// Start the login process by sending the user to Github's authorization page
if(get('action') == 'login') {
// Generate a random hash and store in the session for security
$_SESSION['state'] = hash('sha256', microtime(TRUE).rand().$_SERVER['REMOTE_ADDR']);
unset($_SESSION['access_token']);
$params = array(
'client_id' => OAUTH2_CLIENT_ID,
'redirect_uri' => 'http://' . $_SERVER['SERVER_NAME'] . $_SERVER['PHP_SELF'],
'scope' => 'user',
'state' => $_SESSION['state']
);
// Redirect the user to Github's authorization page
header('Location: ' . $authorizeURL . '?' . http_build_query($params));
die();
}
// When Github redirects the user back here, there will be a "code" and "state" parameter in the query string
if(get('code')) {
// Verify the state matches our stored state
if(!get('state') || $_SESSION['state'] != get('state')) {
header('Location: ' . $_SERVER['PHP_SELF']);
die();
}
// Exchange the auth code for a token
$token = apiRequest($tokenURL, array(
'client_id' => OAUTH2_CLIENT_ID,
'client_secret' => OAUTH2_CLIENT_SECRET,
'redirect_uri' => 'http://' . $_SERVER['SERVER_NAME'] . $_SERVER['PHP_SELF'],
'state' => $_SESSION['state'],
'code' => get('code')
));
$_SESSION['access_token'] = $token->access_token;
header('Location: ' . $_SERVER['PHP_SELF']);
}
if(session('access_token')) {
$user = apiRequest($apiURLBase . 'user');
echo '<h3>Logged In</h3>';
echo '<h4>' . $user->name . '</h4>';
echo '<pre>';
print_r($user);
echo '</pre>';
} else {
echo '<h3>Not logged in</h3>';
echo '<p><a href="?action=login">Log In</a></p>';
}
function apiRequest($url, $post=FALSE, $headers=array()) {
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
if($post)
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post));
$headers[] = 'Accept: application/json';
if(session('access_token'))
$headers[] = 'Authorization: Bearer ' . session('access_token');
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
$response = curl_exec($ch);
return json_decode($response);
}
function get($key, $default=NULL) {
return array_key_exists($key, $_GET) ? $_GET[$key] : $default;
}
function session($key, $default=NULL) {
return array_key_exists($key, $_SESSION) ? $_SESSION[$key] : $default;
}
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