如何轻松使用Facebook API实时更新功能？ [英] How to easily use the Facebook API Realtime Updates feature?
问题描述
所有我想要做的是当有用户时触发或者页面更新（无论是状态/评论/喜欢/等等）实时。
我从实时更新文档，并发现这两个博客文章：
从我的理解，注册对于实时更新，我需要：
- 创建一个WWW Facebook应用程序
- 指向Facebook应用程序到一个
callback_url - 在Facebook调用时，在
callback_url中添加一个php脚本来处理GET请求（验证）和POST请求。 / li>
- 使用Graph API注册回调（
v2.3 / APP_ID / subscriptions） - 将Facebook登录按钮添加到页面（包括所需的范围/权限）并执行登录操作
从理论上讲，根据注册的对象和字段，Facebook应该POST到 callback_url 。
我想我已成功注册回调。这里大致输出我得到（用 MY_CB_URL 替换实际的URL）：
{
data：[
{
object：user，
callback_url：MY_CB_URL，
fields
status
]，
active：true
}，
{
object：page，
callback_url：MY_CB_URL，
fields：[
feed
]，
active：true
}
]
$
回调PHP脚本如下所示：
<？php
define（'VERIFY_TOKEN'，'vToken'）;
$ method = $ _SERVER ['REQUEST_METHOD'];
if（$ method =='GET'&&_ $ _GET ['hub_mode'] =='subscribe'&& $ _GET ['hub_verify_token'] == VERIFY_TOKEN）{
echo $ _GET ['hub_challenge'];
} else if（$ method =='POST'）{
$ out =;
尝试{
$ updates = json_decode（file_get_contents（php：// input），true）;
$ out = print_r（$ updates，true）;
error_log（'updates ='。$ out）;
} catch（异常$ e）{
error_log（'捕获异常：'$ e-> getMessage（））;
$ out = $ e-> getMessage（）;
}
$ file ='./log.txt';
$ current = file_get_contents（$ file）;
$ current。= $ out;
file_put_contents（$ file，$ current）;
}
？>
我遇到的问题是，当我第一次设置这个时，我有一个POST请求，但没有那。我没有任何错误，API确认回调正确注册，所以我对我可能会丢失的东西无能为力。
我发现了这个答案，并打电话建议
https://graph.facebook.com/PAGE_ID/tabs?app_id=APP_ID&access_token=PAGE_ACCESS_TOKEN
并得到此回复：
code> {
data：[
{
id：PAGE_ID / tabs / likes，
name：喜欢，
link：https://www.facebook.com/pages/PAGE_NAME/PAGE_ID?sk=likes，
is_permanent：true，
position：2，
is_non_connection_landing_tab：false
}，
{
id：PAGE_ID / tabs / photos，
image_url：https：// fbcdn-photos -ca.akamaihd.net/hphotos-ak-xaf1/t39。 2080-0 / 851586_10151609549247733_1069686154_n.gif，
name：照片，
link：https://www.facebook.com/pages/PAGE_NAME/PAGE_ID?sk=photos ，
application：{
name：照片，
id：PHOTO_ID
}，
is_permanent：false，
position：1，
is_non_connection_landing_tab：false
}
]
}
所以现在我进一步困惑了。
发出POST请求 https://graph.facebook.com/PAGE_ID/tabs is 过期 - 您需要使用 / PAGE_ID / subscribed_apps 现在订阅一个页面的更新。
https://developers.facebook.com/docs/graph-api/reference/page/subscribed_apps/
First off, apologies for posting yet another question on Facebook Realtime Updates. I have read many existing stackoverflow answers and useful articles which helped, but I still can't seem to figure out how to put everything together. Also, this is the first time I use Facebook and it's API, so please bare with me.
All I'm trying to do is get a trigger when there's a user or page updates (be it status/comment/like/etc.) in realtime.
I started with the Realtime Updates documentation and found these two blog posts handy:
From what I understood, to register for Realtime Updates, I need to:
- Create a WWW Facebook app
- Point the Facebook app to a
callback_url - Add a php script at the
callback_urlto handle a GET request (for verification) and POST requests when Facebook calls. - Register the callback with the Graph API (
v2.3/APP_ID/subscriptions) - Add the Facebook Login button to the page (including the scope/permissions needed) and perform the login action
In theory, after this point, Facebook should POST to the callback_url based on the registered object and fields.
I think I've successfully registered the callback. Here roughly the output I get(with MY_CB_URL replacing the actual URL):
{
"data": [
{
"object": "user",
"callback_url": "MY_CB_URL",
"fields": [
"statuses"
],
"active": true
},
{
"object": "page",
"callback_url": "MY_CB_URL",
"fields": [
"feed"
],
"active": true
}
]
}
The callback php script looks like so:
<?php
define('VERIFY_TOKEN', 'vToken');
$method = $_SERVER['REQUEST_METHOD'];
if ($method == 'GET' && $_GET['hub_mode'] == 'subscribe' && $_GET['hub_verify_token'] == VERIFY_TOKEN) {
echo $_GET['hub_challenge'];
} else if ($method == 'POST') {
$out = "";
try {
$updates = json_decode(file_get_contents("php://input"), true);
$out = print_r($updates, true);
error_log('updates = ' . $out);
} catch (Exception $e) {
error_log('Caught exception: '.$e->getMessage());
$out = $e->getMessage();
}
$file = './log.txt';
$current = file_get_contents($file);
$current .= $out;
file_put_contents($file, $current);
}
?>
The problem I have is I got a single POST request when I first set this up, but none after that. I don't get any errors and the API confirms the callback is correctly registered, so I am clueless on what I may be missing.
I've spotted this answer and make a call as suggested to
https://graph.facebook.com/PAGE_ID/tabs?app_id=APP_ID&access_token=PAGE_ACCESS_TOKEN
and got this response:
{
"data": [
{
"id": "PAGE_ID/tabs/likes",
"name": "Likes",
"link": "https://www.facebook.com/pages/PAGE_NAME/PAGE_ID?sk=likes",
"is_permanent": true,
"position": 2,
"is_non_connection_landing_tab": false
},
{
"id": "PAGE_ID/tabs/photos",
"image_url": "https://fbcdn-photos-c-a.akamaihd.net/hphotos-ak-xaf1/t39.2080-0/851586_10151609549247733_1069686154_n.gif",
"name": "Photos",
"link": "https://www.facebook.com/pages/PAGE_NAME/PAGE_ID?sk=photos",
"application": {
"name": "Photos",
"id": "PHOTO_ID"
},
"is_permanent": false,
"position": 1,
"is_non_connection_landing_tab": false
}
]
}
So now I'm further confused.
Making a POST request to https://graph.facebook.com/PAGE_ID/tabs is outdated – you need to use /PAGE_ID/subscribed_apps now to subscribe to updates from a page.
https://developers.facebook.com/docs/graph-api/reference/page/subscribed_apps/
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