Get user access token on Facebook API

Question

I try to get access token on Facebook API.

According to this answer I need first to build a link https://www.facebook.com/dialog/oauth?client_id=[Your API KEY]&redirect_url=[Service that will handle Authentication]&scope=[Permissions you Need]. In my case it looks like this:

https://www.facebook.com/dialog/oauth?client_id=559149457475028&redirect_uri=http://www.facebook.com/connect/login_success.html&scope=publish_stream

After this it should redirect to specified url with a query string containing code, which in turn can be used to get access token of a user. But in my case it redirects to the following page: http://www.facebook.com/connect/blank.html#_=_ without any queries.

Why is that? How I can get code of a user?

amdorra · Accepted Answer · 2013-08-25T20:30:45.743

1

your redirect_uri shouldn't be http://www.facebook.com/connect/login_success.html it should be a url from your application that would handle facebook authentication

update

if you are still developing your website and you want to test it on your local host you could use localhost/mydevwebsite/login_success/ otherwise use the domain for the application you are working on myappdomain.com/loginsuccess/

edited Aug 25 '13 at 20:30

answered Aug 25 '13 at 20:16

amdorra

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9
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It's not me. Where can I read about making this url? Can I find code or access token in a different way? – Sergey Ivanov Aug 25 '13 at 20:26
if you are still developing your website and you want to test it on your local host you could use `localhost/mydevwebsite/login_success/` other wise use the domain for the application you are working on – amdorra Aug 25 '13 at 20:29
I've also edited the question to include this comment, as it might be helpful – amdorra Aug 25 '13 at 20:31
Indeed, with site URL it redirects with query string. – Sergey Ivanov Aug 25 '13 at 21:28
Will it increase your reputation? – Sergey Ivanov Aug 25 '13 at 21:33
yes it will, you should read [this article] about how to earn reputation on stackoverflow(http://stackoverflow.com/help/whats-reputation) – amdorra Aug 25 '13 at 21:36
you will also get [this badge](http://stackoverflow.com/help/badges/10/scholar) for it – amdorra Aug 25 '13 at 21:37
=) Ok, just asked for fun. – Sergey Ivanov Aug 25 '13 at 21:38

score 0 · Answer 2 · answered Aug 25 '13 at 20:34

0

Access the signed_request parameter and prompt the user to authorize your app:

$app_id = "YOUR_APP_ID";

$canvas_page = "YOUR_CANVAS_PAGE_URL";

$auth_url = "https://www.facebook.com/dialog/oauth?client_id=" 
    . $app_id . "&redirect_uri=" . urlencode($canvas_page);

$signed_request = $_REQUEST["signed_request"];

list($encoded_sig, $payload) = explode('.', $signed_request, 2); 

$data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);

if (empty($data["user_id"])) {
    echo("<script> top.location.href='" . $auth_url . "'</script>");
} else {
    echo ("Welcome User: " . $data["user_id"]);
}

This signed_request contains whole damn required information (including access token).

answered Aug 25 '13 at 20:34

Sahil Mittal

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12
65
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I have no experience working in PHP. Can you translate it to Python? – Sergey Ivanov Aug 25 '13 at 21:25
And I've no exp with python, but Ill explain you the concept. `$signed_request = $_REQUEST["signed_request"];` step triies to fetch the variable singed_request from the url; if it is found, you can save the access token and perform functions, else it will redirect user to auth_url for the authorization step and the process is repeated. – Sahil Mittal Aug 25 '13 at 21:37
1

This might be useful: http://stackoverflow.com/questions/464040/how-are-post-and-get-variables-handled-in-python. But I'm not sure – Sahil Mittal Aug 25 '13 at 21:39

score 0 · Answer 3 · answered Dec 12 '14 at 08:12

0

https://www.facebook.com/dialog/oauth?client_id=[Your API KEY]&redirect_url=[Service that will handle Authentication]&scope=[Permissions you Need].

answered Dec 12 '14 at 08:12

Prasanjit Dhal

1
1

Welcome to Stack Overflow! While this may help answer the question, [it would be preferable](http://meta.stackoverflow.com/q/8259) to include more of an explanation. – Nathan Tuggy Dec 12 '14 at 08:32

Get user access token on Facebook API

3 Answers3