使用Facebook OAuth 2.0 - 如何获取访问令牌？

Question

I am new to OAuth , and I'm trying to use Facebook Connect with my web-application.

I have succeded in getting a verification token, but my problem is "fetching" the access token. How do I fetch it? The Facebook documentation tells me to fetch the access token with this URL:

https://graph.facebook.com/oauth/access_token?'
                + 'client_id=XXXXXXXXXXXX& redirect_uri=http://www.mysite.com/fbconn/index.html&display=touch&'
                + 'client_secret=axxxxxcxxxxxxxxxxx&code=' + code;

When I use this I see the access token on a blank page, but I want to fetch it with JavaScript (Ajax), PHP or something. Is this possible? I thought the access token would be appended to my redirect URI like the verfication code, but I never get redirected to my page. What am I doing wrong?

Answer 1

You need to add &type=user_agent to the request. You will get the AuthToken with a hash marker in the following format.

http://yourredirecturi#code=[accesstoken]

If you set the request to &type=web_server , you'll get the AuthToken as a query string parameter: http://yourredirecturi&code=[accesstoken] .

Here is a full explanation of how to implement the Facebook's OAuth protocol. The code samples are in ASP.NET MVC, but it should translate well enough to any language:

Facebook Platform's OAuth 2.0 Protocol and ASP.NET MVC

Answer 2

Feel free to try the following PHP snippet for getting your access token:

//Fill in the parts in caps with your app details
$token_url = "https://graph.facebook.com/oauth/access_token?client_id=YOUR_APP_ID&redirect_uri=YOUR_URL&client_secret=YOUR_APP_SECRET&code=THE_CODE_YOU_GOT_FROM_THE_SERVER";

$token=file_get_contents($token_url); //Fetching the token from the URL

echo $token; //This is your access token

Thanks,

Answer 3

$token = file_get_contents("the access token URL"); 

会给你访问令牌。