Linkedin API: Exchange JSAPI Token for REST API OAuth Token - api

Question

I'm having some difficulty exchanging my JSAPI token for a REST API token. I'm using this for reference:
https://developer-programs.linkedin.com/documents/exchange-jsapi-tokens-rest-api-oauth-tokens
I've: set up a self signed SSL cert locally, so Linkedin's secure cookie works properly; given my app r_basicprofile and r_emailaddress permissions.
Here's my front end code:
<script type="text/javascript" src="//platform.linkedin.com/in.js">
api_key: **MY_CLIENT_ID**
authorize: true
credentials_cookie: true
</script>
...
$('.linkedin-signin').click(function(e) {
IN.User.authorize( function () {
IN.API.Raw("/people/~").result(function(data) {
$.post(location.origin+'/api/account/create/linkedin', { 'lId': data.id } ).done(function(result) {
console.log(result);
});
});
});
return false;
});
And here is my PHP code, which is almost exactly as in their docs:
$consumer_key = '**MY_CLIENT_ID**';
$consumer_secret = '**MY_CLIENT_SECRET**';
$cookie_name = "linkedin_oauth_${consumer_key}";
$credentials_json = $_COOKIE[$cookie_name];
$credentials = json_decode($credentials_json);
$access_token_url = 'https://api.linkedin.com/uas/oauth/accessToken';
$oauth = new OAuth($consumer_key, $consumer_secret);
$access_token = $credentials->access_token;
// swap 2.0 token for 1.0a token and secret
$oauth->fetch($access_token_url, array('xoauth_oauth2_access_token' => $access_token), OAUTH_HTTP_METHOD_POST);
Everything looks good, but on $oauth->fetch, I get the error:
OAuthException(code: 401): Invalid auth/bad request (got a 401, expected HTTP/1.1 20X or a redirect)
Which leads me to believe that the token is invalid... but it's taken directly from the cookie, so how could it be invalid? Any ideas?

Answer 1

Today we got the weird 401 error too, apperently linkedin was broken, because after an hour it worked again without any changes on our side.
I found this site though and eventhough it's a really old post, i tought i'd share how we fixed it, which works.
JS Front-end
var AppConfig = {
linkedin : {
onLoad : "linkedinLibInit",
api_key : 'YOUR_API_KEY',
authorize : false,
credentials_cookie: true
}
};
window.linkedinLibInit = function ( response ) {
// post init magic
// cleanup window callback function
delete window.linkedinLibInit;
}
$.getScript( "//platform.linkedin.com/in.js?async=true", function success() {
IN.init( AppConfig.linkedin );
} );
function connectToLinkedIn() {
if ( IN.User.isAuthorized() ) {
_linkedinAuthorized();
}
else {
IN.User.authorize( _linkedinAuthorized );
}
}
function _linkedinAuthorized() {
IN.API.Profile( "me" )
.fields( 'id', 'first-name', 'last-name', 'location', 'industry', 'headline', 'picture-urls::(original)', 'email-address' )
.result( function ( response ) {
var accessToken = JSON.parse( $.cookie( 'linkedin_oauth_' + AppConfig.linkedin.api_key ) );
// performApi Call to backend
} )
.error( function ( err ) {
// render error
} );
}
PHP Backend using PECL oAuth
function offlineAuthLinkedIn($accessToken, $linkedinConfig) {
$oAuth = new \OAuth( $linkedinConfig['app_id'], $linkedinConfig['app_secret'] );
$oAuth->fetch(
'https://api.linkedin.com/uas/oauth/accessToken',
array('xoauth_oauth2_access_token' => $accessToken),
OAUTH_HTTP_METHOD_POST
);
$response = null;
parse_str($oAuth->getLastResponse(), $response);
$oAuth->setToken($response['oauth_token'], $response['oauth_token_secret']);
$oAuth->fetch(
'http://api.linkedin.com/v1/people/~:(id,first-name,last-name,formatted-name,headline,location,picture-url,picture-urls::(original),public-profile-url)',
array(),
OAUTH_HTTP_METHOD_GET,
array('x-li-format' => 'json')
);
$profile = json_decode($oAuth->getLastResponse(), true);
$profile['user_id'] = $profile['id'];
if (true == isset($profile['pictureUrl']))
{
$profile['profile_image'] = $profile['pictureUrl'];
unset($profile['pictureUrl']);
}
return $profile;
}