ThinkPHP实现PayPal登录

最近做跨境电子商务程序的第三方登录用到了PayPal登录，发上来给需要的人。
namespace Home\Controller;
use Think\Controller;
class User extends Controller{
public function paypal(){
$_SESSION['state'] = md5(uniqid(rand(), TRUE));
$client_id = '你的client_id';
$client_secret = '你的client_secret';
$nonce = time() . rand();
$app_return_url = 'http://yourdomain/user/paypal_return'; //这里的返回地址必须要与你在paypal上创建client_id时填写的返回地址一致
$scopes = 'profile+email+address+phone';
$paypal_auth_url = "https://www.paypal.com/webapps/auth/protocol/openidconnect/v1/authorize?"
."client_id=".$client_id
."&response_type=code"
."&scope=".$scopes
."&nonce=".$nonce
."&state=".$_SESSION['state']
."&redirect_uri=".urlencode($app_return_url);
//echo $paypal_auth_url;exit;
header("Location: $paypal_auth_url");
}

/**
* Paypal返回地址
* @return void
*/
public function paypal_return(){
$code = trim($_GET['code']);

$client_id = '你的client_id';
$client_secret = '你的client_secret';
//根据授权码获取到access_token
if(!isset($_SESSION['access_token'])){
$token_url = "https://www.paypal.com/webapps/auth/protocol/openidconnect/v1/tokenservice";
$postvals = "client_id=".$client_id
."&client_secret=".$client_secret
."&grant_type=authorization_code"
."&code=".$code;
$response = Http::fsockopenDownload($token_url,array(
'post' => $postvals,
));
$atoken = json_decode($response);
$access_token = $atoken->access_token;
$_SESSION['access_token'] = $access_token; //token可以保存起来使用，貌似15分钟后才会失效
}
//获取到用户资料
$profile_url = "https://www.paypal.com/webapps/auth/protocol/openidconnect/v1/userinfo?"
."schema=openid"
."&access_token=".$_SESSION['access_token'];
$profile = file_get_contents($profile_url);
$profile = json_decode($profile);
if(isset($profile->error)){
exit($profile->message);
}
//注意：有些资料不一定会返回
$email = $profile->email;
$name = $profile->name;
$first_name = $profile->family_name;
$last_name = $profile->given_name;
$phone = $profile->phone_number;
$locale = $profile->locale;
$address = $profile->address;
}
}
?>

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