Facebook API sdk 4.0 - 将照片发布到 Facebook

Question

我正在尝试创建一个应用程序，用户可以在其中浏览并从他们的计算机将照片提交到他们的 Facebook 上。为此，他们首先必须将他们的照片上传到服务器，然后使用 facebook 请求，将这张图片发布到 facebook。我正在使用多部分/表单数据。

这是我到目前为止所拥有的，假设我有一个有效的会话，我的 api 请求：

$request = new Facebook{
$session,
'POST',
'/me/photos',
array (
    'source' => '{image-data}',
    )
    );
    $response = $request->execute();
    $graphObject = $response->getGraphObject();
    /* handle the result*/

我不确定用什么替换图像数据。

对于上传照片，我的代码如下：

   if(isset($_POST['submit'])){

$file_type = $_FILES['file']['type']; //returns the file type

$allowed = array("image/jpeg", "image/gif", "image/png", "image/jpg"); //specifies allowed file types
if(!in_array($file_type, $allowed)) {
        $error_message = 'Only jpeg, jpg, gif, and png files are allowed. <br> 
        Please click back and try again.';
        echo $error_message;

        exit();
    }

$name       = $_FILES['file']['name'];  //original path of the uploaded file
$temp_name  = $_FILES['file']['tmp_name'];  //contains the path to the temporary file that resides on the server
if(isset($name)){
    if(!empty($name)){      
        $location = 'uploads/'; //save photo to the folder: uploads
        if(move_uploaded_file($temp_name, $location.$name)){
            echo 'Photo was successfully uploaded.';
        }
    }       
}  else {
    echo 'Photo was unsuccessfully uploaded, click back and try again.';
 }
 }

我是 facebook api 的新手，也是编码新手。任何帮助或建议将不胜感激。谢谢。

完整代码：

     <?php

  require_once( 'Facebook/HttpClients/FacebookHttpable.php' );
  require_once( 'Facebook/HttpClients/FacebookCurl.php' );
  require_once( 'Facebook/HttpClients/FacebookCurlHttpClient.php' );

  require_once( 'Facebook/Entities/AccessToken.php' );
  require_once( 'Facebook/Entities/SignedRequest.php' );
  require_once( 'Facebook/FacebookSession.php' );
  require_once( 'Facebook/FacebookRedirectLoginHelper.php' );
  require_once( 'Facebook/FacebookRequest.php' );
  require_once( 'Facebook/FacebookResponse.php' );
  require_once( 'Facebook/FacebookSDKException.php' );
  require_once( 'Facebook/FacebookRequestException.php' );
  require_once( 'Facebook/FacebookServerException.php' );
  require_once( 'Facebook/FacebookOtherException.php' );
  require_once( 'Facebook/FacebookAuthorizationException.php' );
  require_once( 'Facebook/GraphObject.php' );
  require_once( 'Facebook/GraphSessionInfo.php' );


  use Facebook\HttpClients\FacebookHttpable;
  use Facebook\HttpClients\FacebookCurl;
  use Facebook\HttpClients\FacebookCurlHttpClient;

  use Facebook\Entities\AccessToken;
  use Facebook\Entities\SignedRequest;
  use Facebook\FacebookSession;
  use Facebook\FacebookRedirectLoginHelper;
  use Facebook\FacebookRequest;
  use Facebook\FacebookResponse;
  use Facebook\FacebookSDKException;
  use Facebook\FacebookRequestException;
  use Facebook\FacebookServerException;
  use Facebook\FacebookOtherException;
  use Facebook\FacebookAuthorizationException;
  use Facebook\GraphObject;
  use Facebook\GraphSessionInfo;


 // start session
 session_start();

// init app with app id and secret
FacebookSession::setDefaultApplication( 'xxxxxxxxxx','xxxxxxxxxxxxx' );

// login helper with redirect_uri
$helper = new FacebookRedirectLoginHelper( 'https://apps.facebook.com/myapp' );

// see if a existing session exists
if ( isset( $_SESSION ) && isset( $_SESSION['fb_token'] ) ) {
    // create new session from saved access_token
    $session = new FacebookSession( $_SESSION['fb_token'] );

// validate the access_token to make sure it's still valid
try {
    if ( !$session->validate() ) {
    $session = null;
    }
} catch ( Exception $e ) {
// catch any exceptions
$session = null;
    }
}     

if ( !isset( $session ) || $session === null ) {
    // no session exists

try {
$session = $helper->getSessionFromRedirect();
    } catch( FacebookRequestException $ex ) {
    // When Facebook returns an error
    // handle this better in production code
        print_r( $ex );
            } catch( Exception $ex ) {
// When validation fails or other local issues
// handle this better in production code
    print_r( $ex );
}

}

// see if we have a session
if ( isset( $session ) ) {

// save the session
$_SESSION['fb_token'] = $session->getToken();
// create a session using saved token or the new one we generated at login
$session = new FacebookSession( $session->getToken() );

// graph api request for user data
$request = new FacebookRequest( $session, 'GET', '/me' );
$response = $request->execute();
// get response
$graphObject = $response->getGraphObject()->asArray();



// print logout url using session and redirect_uri (destroy the session)
echo '<a href="' . $helper->getLogoutUrl( $session, 'http://localhost/app/index.php', session_destroy() ) .    '">Logout</a>';

} else {
  // show login url
  echo '<a href="' . $helper->getLoginUrl( array( 'email', 'user_friends', 'publish_actions' ) ) . '">Login</a>';

}


 ?>

  <html>
     <head>
        <title> My App</title>
    </head>

    <body>
    <div>


    <form method="post" enctype="multipart/form-data">
    Please select a photo to upload <input type="file" name="file" id="file"><br><br>
    <input type="submit" value="Upload" name="submit">

    </form>
    </div>

   </body>
 </html>
 <?php
    if(isset($_POST['submit'])){

    $file_type = $_FILES['file']['type']; //returns the file type

    $allowed = array("image/jpeg", "image/gif", "image/png", "image/jpg"); //specifies allowed file types
    if(!in_array($file_type, $allowed)) {
        $error_message = 'Only jpeg, jpg, gif, and png files are allowed. <br> 
        Please click back and try again.';
        echo $error_message;

        exit();
    }

     $name       = $_FILES['file']['name'];  //original path of the uploaded file
     $temp_name  = $_FILES['file']['tmp_name'];  //contains the path to the temporary file that resides on the server
     if(isset($name)){
     if(!empty($name)){      
        $location = 'uploads/'; //save photo to the folder: uploads
        if(move_uploaded_file($temp_name, $location.$name)){
            echo 'Photo was successfully uploaded.';
        }
    }       
 }  else {
    echo 'Photo was unsuccessfully uploaded, click back and try again.';
 }

$session = new FacebookSession( $_SESSION['fb_token']);
$request = new FacebookRequest(
 $session,
 'POST',
 '/me/photos',
 array (
    'source' => file_get_contents($location.$name),
 )
 );

  $response = $request->execute();
  $graphObject = $response->getGraphObject();
    print_r($response);
  }

    $token = $_GET['code'];
    echo $token;


     ?>

Answer 1

好的，您的代码有两个主要问题。

第一：

从您的代码中删除 session_destroy()。这就是会话被删除的原因。然后，您可以从代码中删除 $session = new FacebookSession( $_SESSION['fb_token']); 的第二次使用。你只需要做一次！

变化：

echo '<a href="' . $helper->getLogoutUrl( $session, 'http://localhost/app/index.php', session_destroy() ) .    '">Logout</a>';

到

echo '<a href="' . $helper->getLogoutUrl( $session, 'http://localhost/app/index.php' ) .    '">Logout</a>';

第二次：

将@ 附加到您的source，您会发现图片上传正确。例如：

$request = new FacebookRequest(
  $session,
  'POST',
  '/me/photos',
  array (
    'source' => new CURLFile( $location.$name ),
  )
);

CURLFile 仅适用于 PHP 5.5+。对于早期版本的 PHP，将源设置为：

'source' => '@' . $location.$name

Answer 2

假设用户已经正确上传了图片并且$location.$name是路径：

 $request = new FacebookRequest(
     $session,
     'POST',
     '/me/photos',
     array (
        'source' => file_get_contents($location.$name),
     )
  );

 $response = $request->execute();
 $graphObject = $response->getGraphObject();

或者另一种可能性是通过 URL：

 $request = new FacebookRequest(
   $session,
   'POST',
   '/me/photos',
   array (
     'url' => $the_url_to_the_image,
   )
 );

 $response = $request->execute();
 $graphObject = $response->getGraphObject();

您在上传后执行的 API 调用由用户完成，但这不过是合乎逻辑的。