facebook登录 在 php 框架 slim里的实现

首先使用composer 安装 facebook的php SDK
composer require facebook/graph-sdk

使用了Slim框架，登录也是调用的接口，总共定义了两个链接(或者路由)facebookLogin和facebookCallback . 一个入口链接:负责处理跳转到facebook登录并跳回的功能。另一个是处理回调的：获取facebook的用户基本信息并登录。

facebookLogin

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function facebookLogin(Request $request,Response $response)
{  
    $appid='1213187855410344';
    $fb = new \Facebook\Facebook([
      'app_id' => $appid,
      'app_secret' => '8b1151cfa1958249297e6e061e771207',
      'default_graph_version' => 'v2.8',
      ]);
    $helper = $fb->getRedirectLoginHelper();
    $permissions = ['email']; // Optional permissions
    $loginUrl = $helper->getLoginUrl('http://www.product.win/fb-callback', $permissions);
    return $response->withRedirect($loginUrl);
}
    function facebookCallback(Request $request, Response $slimresponse)
{
    $utils=new Utils($this->guzzle,$this->id_token,$this->logger,$this->lg);
    $appid='1213187855410344';
    $fb = new \Facebook\Facebook([
      'app_id' => $appid, 
      'app_secret' => '8b1151cfa1958249297e6e061e771207',
      'default_graph_version' => 'v2.8',
      ]);
    $helper = $fb->getRedirectLoginHelper();
    try {
      $accessToken = $helper->getAccessToken();
    } catch(Facebook\Exceptions\FacebookResponseException $e) {
      // When Graph returns an error
      echo 'Graph returned an error: ' . $e->getMessage();
      exit;
    } catch(Facebook\Exceptions\FacebookSDKException $e) {
      // When validation fails or other local issues
      echo 'Facebook SDK returned an error: ' . $e->getMessage();
      exit;
    }
    if (! isset($accessToken)) {
      if ($helper->getError()) {
        header('HTTP/1.0 401 Unauthorized');
        echo "Error: " . $helper->getError() . "\n";
        echo "Error Code: " . $helper->getErrorCode() . "\n";
        echo "Error Reason: " . $helper->getErrorReason() . "\n";
        echo "Error Description: " . $helper->getErrorDescription() . "\n";
      } else {
        header('HTTP/1.0 400 Bad Request');
        echo 'Bad request';
      }
      exit;
    }
    //上面为处理跳转授权之类的代码  下面是获取用户信息   根据传递的字段 获取...
    try {
      // Get the \Facebook\GraphNodes\GraphUser object for the current user.
      // If you provided a 'default_access_token', the '{access-token}' is optional.
      $response = $fb->get('/me?fields=id,name,email,picture,gender',$accessToken);
    } catch(\Facebook\Exceptions\FacebookResponseException $e) {
      // When Graph returns an error
      echo 'Graph returned an error: ' . $e->getMessage();
      exit;
    } catch(\Facebook\Exceptions\FacebookSDKException $e) {
      // When validation fails or other local issues
      echo 'Facebook SDK returned an error: ' . $e->getMessage();
      exit;
    }
    $me = $response->getGraphUser();//facebook/src/Facebook/GraphNodes/GraphUser.php  类文件
    
    if($me->getEmail()){//手机注册的可能没有email账号...
        $postData=[
            'appid'=>$appid,
            'email'=>$me->getEmail(),
            'gender'=>$me->getGender(),
            'name'=>$me->getName(),
            'os'=>$utils->getOS(),//utils文件新增获取操作系统的功能
            'picture'=>$me->getPicture()->getUrl(),//facebook/src/Facebook/GraphNodes/GraphPicture.php 类文件
            'rememberMe'=>true,
            'token'=>$accessToken->getValue(),
            'userid'=>$me->getId()
        ];
        //调用facebook接口登录
        $ret=$utils->faceBookLogin(['json'=>$postData]);
        if(isset($ret['id_token'])){
            setcookie("id_token","Bearer ".$ret['id_token'],time()+3600*24,'/'); 
            setcookie("fb_user",json_encode($ret),time()+3600*24,'/'); //保存接口返回的信息  
            return $slimresponse->withRedirect('/'); //$slimresponse 避免和 facebook的$response 重名
        }
    }else{
        //手机注册的可能没有email账号...
        die('the Facebook account doesn\'t have the email address...');
    }
 }