对于具有所有权限的应用程序，无法获取Facebook页面的访问令牌 [英] Can't get access token for a facebook page for an application that has all the right permissions

问题描述

SO社区

我试图将一个应用程序自动发送到我的Facebook页面。

这些是我采取的步骤：

A）我授权我的所有Facebook页面的应用程序，并授予offline_access权限，publish_stream和manage_pages使用

$ a
$ b $ = read_stream，publish_stream，manage_pages，offline_access，publish_actions

B）我请求了应用程序的访问令牌，那些权限

  https://graph.facebook.com/oauth/access_token?grant_type=client_credentials&client_id=<app_id> & client_secret =< app_secure_key>& scope = manage_pages，offline_access，publish_stream 
  

C）想要获取页面的访问令牌，以便能够使用

 $ code > 

但是获取page_access_token是我失败的地方

这是我正在尝试的电话

  https://graph.facebook.com/<page_id>?fields=access_token&access_token=<app_access_token> 
  

而不是页面的访问令牌，我只是得到这个：

  {
id：< page_id> 
} 
  

任何人都有任何见识，我缺少得到。

/ Thomas

解决方案

我们刚刚设法在过去的几个天。这是一个总结。如果我详细说明了这一点，我很抱歉，但是你所做的几件事似乎有点错误。总结您的步骤：

如果您正在执行 step_A 正确，网址的外观似乎是正确的，那么最后你会收到一个CODE（而不是最后的访问令牌）。这将是使用您在步骤A中发送的重定向网址的重定向，因此请确保您的服务器正在接受在此指定的 redirectURL 的请求。它将以 http：// redirectURL？code = A_CODE_GENERATED_BY_SERVER 的形式，所以做params [code]应该得到你的代码。

Step_B可能是您稍微关闭的地方。您已将 CODE 从step_A发送回服务器。我看到您已经再次设置了一个范围参数，现在不需要（在 step_A 中完成）。 Step_B ，您的请求网址应如下所示：

  https://graph.facebook.com/oauth/ access_token？client_id = YOUR_APP_ID& redirect_uri = YOUR_URL& client_secret = YOUR_APP_SECRET& code = THE_CODE_FROM_ABOVE 
  

使用redirectURL，然后返回响应 不。如果您具有正确的 Step_B 请求URI，您可以将其粘贴到浏览器位置栏中，并且响应将在浏览器本身中呈现。您可以使用 HTTPBuilder （这是我正在使用的）并捕获此响应体。它的形式是 access_token =< really_big_string>& expires =< time_to_live> 。解析这个回应，无论你喜欢哪种方式。

这也是一个access_token（让我们称之为 access_token_uno ），我想有一些事情你可以使用这个。我还没有尝试过，所以我们继续执行 Step_C 。我想你已经知道你的 PageID 。您必须以

  https://graph.facebook.com/<格式的URL发送access_token_uno到Facebook PAGEID>字段=&的access_token放大器; =的access_token< access_token_uno> 
  

响应将是一个JSON块的形式：

  {
access_token：< required_pa​​ge_access_token> 
id：< PageID> 
} 
  

解析JSON块，你完成了。

要记住的一个小细节：redirectURL必须在 Step_A 和 Step_B 中保持不变，否则事情就会失败。此外，我还没有尝试使用 offline_access 权限，但我不认为上述步骤会改变，即使是这样。

SO community,

I am stuck in my attempt to have an application post automatically to my Facebook page.

These are the steps I took:

A) I authorized my application for all my facebook pages and granted permissions offline_access, publish_stream and manage_pages using

https://www.facebook.com/dialog/oauth?client_id=<app_id>&redirect_uri=<url>&scope=read_stream,publish_stream,manage_pages,offline_access,publish_actions

B) I requested the access token for the application with those permissions

https://graph.facebook.com/oauth/access_token?grant_type=client_credentials&client_id=<app_id>&client_secret=<app_secure_key>&scope=manage_pages,offline_access,publish_stream

C) I now want to get the access token for the page to be able to do the final post using

https://graph.facebook.com/feed?<page_access_token>&message=test&id=<page_id>&method=post

however getting the page_access_token is where I am failing

This is the call I am trying

https://graph.facebook.com/<page_id>?fields=access_token&access_token=<app_access_token>

but instead of the page's access token I just get this back:

{
   "id": "<page_id>"
}

Anyone has any insight what I am missing to get the .

/Thomas

解决方案

We just managed to get this working in this past couple of days. Here's a summary. I apologize if I am detailing it beyond necessary but a couple of things you have done seem a bit wrong. To sum up your steps:

If you are doing step_A correct, which by the looks of the URL seems all right, then at the end of it you will receive a CODE (not the final access token). This will be a redirection using the redirect URL you sent in step A, so make sure your server is accepting a request for that redirectURL specified there. It will be in the form http://redirectURL?code=A_CODE_GENERATED_BY_SERVER so doing params[code] should get you the CODE.

Step_B might be where you are slightly off. You have send the CODE from step_A back to the server. I see that you have set a scope parameter again which is now not necessary (it was done in step_A). Step_B your request URL should look like

https://graph.facebook.com/oauth/access_token?client_id=YOUR_APP_ID&redirect_uri=YOUR_URL&client_secret=YOUR_APP_SECRET&code=THE_CODE_FROM_ABOVE

This time Facebook sends back a Response not using the redirectURL though. If you have the correct Step_B request URI you can paste it in your browser location bar and the response will render in your browser itself. You can use an HTTPBuilder (that's what I am using) and capture this Response body. It is of the form access_token=<really_big_string>&expires=<time_to_live>. Parse this response whichever way you prefer.

This is also an access_token (let's call it access_token_uno) and I suppose there is some amount of things you can do using this. I haven't tried it myself though and so we proceed to Step_C. I suppose you already know your PageID. You have to send back access_token_uno to Facebook in a URL of the form

https://graph.facebook.com/<PageID>?fields=access_token&access_token=<access_token_uno>

The response will be a JSON block of the form:

{
   "access_token": <required_page_access_token>,
   "id": <PageID>
}

Parse the JSON block and you are done.

The one minor detail to remember: The redirectURL has to remain the same in Step_A and Step_B else the thing fails. Also, I haven't yet tried with the offline_access permission but I don't think the steps above will change even if that is the case.

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