我如何找到什么页面已经安装了我的Facebook应用程序/哪个页面正在加载我的应用程序 [英] How can I find out what Page has installed my Facebook App / which page is loading my app
问题描述
我正在使用PHP-SDK
当用户导航到Facebook
页面时,他们将看到您的页面Tab
添加到下一个可用的选项卡
位置。一般来说,页面选项卡的
的加载方式与
Canvas页面完全相同。 当用户选择
Page Tab时,您将收到
signed_request
参数,其中一个
附加参数页
。此
参数包含一个JSON对象,
一个id(当前
页面的页面ID),admin(如果用户是该页面的admin
),并喜欢(如果用户
喜欢的页面)。与Canvas
页面一样,在
用户授权您的应用程序之前,您将不会在signed_request中收到
应用程序的所有
用户信息。
所以捕捉页面ID的一种方法是:
<?php
// PATH TO FB-PHP-SDK
require'../../src/facebook.php';
$ facebook = new Facebook(array(
'appId'=>'APP_ID',
'secret'=>'APP_SECRET',
'cookie '=> true,
));
$ signed_request = $ facebook-> getSignedRequest();
if($ page = $ signed_request ['page']){
echo $ page ['id'];
}
?>
或没有PHP-SDK的解决方案:
<?php
if(!empty($ _ REQUEST [signed_request])){
$ app_secret =APP_SECRET;
$ data = parse_signed_request($ _ REQUEST [signed_request],$ app_secret);
if(isset($ data [page])){
echo $ data [page] [id];
} else {
echo不在页面;
}
}
函数parse_signed_request($ signed_request,$ secret){
list($ encoded_sig,$ payload)= explode('。',$ signed_request, 2);
//解码数据
$ sig = base64_url_decode($ encoded_sig);
$ data = json_decode(base64_url_decode($ payload),true);
if(strtoupper($ data ['algorithm'])!=='HMAC-SHA256'){
error_log('未知算法,预期的HMAC-SHA256');
返回null;
}
//检查sig
$ expected_sig = hash_hmac('sha256',$ payload,$ secret,$ raw = true);
if($ sig!== $ expected_sig){
error_log('Bad Signed JSON signature!');
返回null;
}
return $ data;
}
函数base64_url_decode($ input){
返回base64_decode(strtr($ input,'-_','+ /'));
}
I have a canvas app (http://apps.facebook.com/myapp) and other pages (businesses, etc) can Add it to their page. Within my app, how can I know which page I'm being called from?
I'm using the PHP-SDK
As documented in Facebook Page Tab Tutorial:
When a user navigates to the Facebook Page, they will see your Page Tab added in the next available tab position. Broadly, a Page Tab is loaded in exactly the same way as a Canvas Page. When a user selects your Page Tab, you will received the
signed_request
parameter with one additional parameter,page
. This parameter contains a JSON object with an id (the page id of the current page), admin (if the user is a admin of the page), and liked (if the user has liked the page). As with a Canvas Page, you will not receive all the user information accessible to your app in the signed_request until the user authorizes your app.
So one way to capture the page id would be:
<?php
// PATH TO FB-PHP-SDK
require '../../src/facebook.php';
$facebook = new Facebook(array(
'appId' => 'APP_ID',
'secret' => 'APP_SECRET',
'cookie' => true,
));
$signed_request = $facebook->getSignedRequest();
if( $page = $signed_request['page'] ) {
echo $page['id'];
}
?>
OR a solution without the PHP-SDK:
<?php
if(!empty($_REQUEST["signed_request"])) {
$app_secret = "APP_SECRET";
$data = parse_signed_request($_REQUEST["signed_request"], $app_secret);
if (isset($data["page"])) {
echo $data["page"]["id"];
} else {
echo "Not in a page";
}
}
function parse_signed_request($signed_request, $secret) {
list($encoded_sig, $payload) = explode('.', $signed_request, 2);
// decode the data
$sig = base64_url_decode($encoded_sig);
$data = json_decode(base64_url_decode($payload), true);
if (strtoupper($data['algorithm']) !== 'HMAC-SHA256') {
error_log('Unknown algorithm. Expected HMAC-SHA256');
return null;
}
// check sig
$expected_sig = hash_hmac('sha256', $payload, $secret, $raw = true);
if ($sig !== $expected_sig) {
error_log('Bad Signed JSON signature!');
return null;
}
return $data;
}
function base64_url_decode($input) {
return base64_decode(strtr($input, '-_', '+/'));
}
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