FACEBOOK Development (API) Changes

8/3/2019 FACEBOOK Development (API) Changes

1/7

FACEBOOK Development (API) Changes

Galaxy Web links Ltd.

349 5th avenue New York

NY 10016, United States

Website: http://www.galaxyweblinks.com

Face book connect guide for all users using face book connect on your site

Face book has updated its code and all users who have face book connect on their

site will need to update the codes to function properly. The techies atGalaxyhave

been prompt in applying the same to all our client sites and are sharing theinformation here which will help the developers at large to update their face book

connect authentication process to keep it in syn with Face book.

Please see below the code modification process explained with examples.

Example Old Method

Example New Method

Example PHP Old Method for getting facebook cookie

functionget_facebook_cookie_old($app_id, $application_secret) {

$args = array();

if(isset($_COOKIE['fbs_' . $app_id]))

parse_str(trim($_COOKIE*'fbs_' . $app_id+, \\), $args);

ksort($args);

$payload = ;

foreach ($args as $key => $value) {

if ($key != sig)
http://www.galaxyweblinks.com/http://www.galaxyweblinks.com/http://www.galaxyweblinks.com/http://www.galaxyweblinks.com/


2/7






$payload .= $key . = . $value;

}

}

if(isset($args['sig']))

if (md5($payload . $application_secret) != $args['sig']) {

return null;

}

return $args;

}

Example PHP New Method for getting facebook cookie

functionget_facebook_cookie($app_id, $app_secret) {

$signed_request = ;

if(isset($_COOKIE['fbsr_' . $app_id]))

$signed_request = parse_signed_request($_COOKIE['fbsr_' . $app_id],

$app_secret);

// $signed_request should now have most of the old elements

$signed_request["uid"] = isset($signed_request["user_id"]) ?

$signed_request["user_id"] : NULL; // for compatibility

if (!is_null($signed_request)) {

// the cookie is valid/signed correctly

// lets change code into an access_token


3/7






if(isset($signed_request["code"])) {

$access_token_response =

file_get_contents(https://graph.facebook.com/oauth/access_token?client_id=$a

pp_id&redirect_uri=&client_secret=$app_secret&code=.$signed_req uest["code"

]);

parse_str($access_token_response);

$signed_request["access_token"] = $access_token;

$expires = (60 * 60);

$signed_request["expires"] = time() + $expires;

}

}

return $signed_request;

}

function base64_url_decode($input) {

return base64_decode(strtr($input, -_, /));

}

functionparse_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);


4/7






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;

}

Example Javascript Old Method

FB.init(appId: YOUR_FACEBOOK_API_ID,

status: true,

cookie: true,

xfbml: true

});

FB.Event.subscribe(auth.login, function(response)


5/7






window.location=PATH_TO_BE_REDIRECT_AFTER_LOGIN;

});

//check facebook login status

FB.getLoginStatus(function(response) {

if (response.session) {

//logged in, force logout

FB.logout(function() {

// If needed

window.location = PATH_TO_BE_REDIRCT_AFTER_LOGOUT;

});

} else {

//not logged in

}

});

Example Javascript New Method

FB.init(appId: YOUR_FACEBOOK_API_ID,

status: true,

cookie: true,


6/7






xfbml: true,

oauth : true

});

FB.Event.subscribe(auth.login, function(response) {

window.location=https://www.facebook.com/dialog/oauth?client_id=YOUR_FAC

EBOOK_API_ID&redirect_uri=PATH_TO_BE_REDIRECT_AFTER_LOGIN&response_t

ype=token;

});

//check facebook login status

FB.getLoginStatus(function(response) {

if(response.authResponse) {

//logged in, force logout

FB.logout(function() {

// If needed

window.location = PATH_TO_BE_REDIRCT_AFTER_LOGOUT;

});

} else {

//not logged in

}

});


7/7






AtGalaxy We blinkswe create custom Face book apps for businesses. Our experts

have strong experience in developing custom Face book applications and

integrate them with websites. For details please visit us at

http://www.galaxyweblinks.com/services/facebook-apps/.

More References:

http://blog.galaxyweblinks.com/2011/12/16/facebook-apps/facebook-connect-

login-problem-an-easy-solution-by-galaxy-weblinks/

https://developers.facebook.com/docs/guides/web/

http://developers.facebook.com/docs/appsonfacebook/tutorial/

https://developers.facebook.com/blog/post/464

http://developers.facebook.com/docs/reference/javascript/
http://www.galaxyweblinks.com/http://www.galaxyweblinks.com/http://www.galaxyweblinks.com/http://www.galaxyweblinks.com/contact-us/http://www.galaxyweblinks.com/contact-us/http://www.galaxyweblinks.com/contact-us/http://www.galaxyweblinks.com/contact-us/http://blog.galaxyweblinks.com/2011/12/16/facebook-apps/facebook-connect-login-problem-an-easy-solution-by-galaxy-weblinks/http://blog.galaxyweblinks.com/2011/12/16/facebook-apps/facebook-connect-login-problem-an-easy-solution-by-galaxy-weblinks/http://blog.galaxyweblinks.com/2011/12/16/facebook-apps/facebook-connect-login-problem-an-easy-solution-by-galaxy-weblinks/https://developers.facebook.com/docs/guides/web/https://developers.facebook.com/docs/guides/web/http://developers.facebook.com/docs/appsonfacebook/tutorial/http://developers.facebook.com/docs/appsonfacebook/tutorial/https://developers.facebook.com/blog/post/464http://developers.facebook.com/docs/reference/javascript/http://developers.facebook.com/docs/reference/javascript/https://developers.facebook.com/blog/post/464http://developers.facebook.com/docs/appsonfacebook/tutorial/https://developers.facebook.com/docs/guides/web/http://blog.galaxyweblinks.com/2011/12/16/facebook-apps/facebook-connect-login-problem-an-easy-solution-by-galaxy-weblinks/http://blog.galaxyweblinks.com/2011/12/16/facebook-apps/facebook-connect-login-problem-an-easy-solution-by-galaxy-weblinks/http://www.galaxyweblinks.com/contact-us/http://www.galaxyweblinks.com/contact-us/http://www.galaxyweblinks.com/

Documents

FACEBOOK Development (API) Changes