LinkedIn oAuth - Accessing simple read only public data - no posting etc - php

Question

I'm trying to do a very basic setup of LinkedIn - accessing public profile data about people.
I've tried several ways of accessing with oAuth over several hours. I'm not getting anywhere.
All the existing class structures et'al seem to help with accessing a user's account to post, or add friends, find a fish etc. I don't need any of that. I just want to get basic profile data.
Some code of latest attempts; but I don't get it past here:-
$consumer = new OAuthConsumer($apiKey, $apiSecret);
$signature_method = new OAuthSignatureMethod_HMAC_SHA1();
$req_req = OAuthRequest::from_consumer_and_token($consumer, NULL, "GET", $linkedInURL . "/uas/oauth/requestToken");
$req_req->sign_request($signature_method, $consumer, NULL);
$signed_url = $req_req->to_url();
That should gives me a signed request of:-
https://api.linkedin.com/uas/oauth/requestToken?oauth_consumer_key=xxx&oauth_nonce=xx&oauth_signature=xxxx&oauth_signature_method=HMAC-SHA1&oauth_timestamp=1316530337&oauth_version=1.0
Obviously, that's not what I need to get data. But, just out of interest I checked the URL with the API data request, as such:-
http://api.linkedin.com/v1/people/url=http%3A%2F%2Fwww.linkedin.com%2Fin%2Fchrisvoss:public?oauth_consumer_key=xxx&oauth_nonce=xxx&oauth_signature=xxx&oauth_signature_method=HMAC-SHA1&oauth_timestamp=1316529463&oauth_version=1.0
And got :-
<error>
<status>401</status>
<timestamp>1316531835564</timestamp>
<request-id>L8A1M85MWN</request-id>
<error-code>0</error-code>
<message>
[unauthorized].OAU:tm6i3ke827xz|*01|*01|*01:1316529463:MSFHS3f4iaG9pg2gWYlf22W4NPo=
</message>
</error>
I'm just a bit clueless here. I know everyone says it's tears to implement oAuth and Linkedin. But, I don't need half of what most need, so how do I get to the basic data is only my question.
Thanks in advance for any help.

Answer 1

Try To Use the following code
session_start();
require_once("OAuth.php");
$domain = "https://api.linkedin.com/uas/oauth";
$sig_method = new OAuthSignatureMethod_HMAC_SHA1();
$test_consumer = new OAuthConsumer("DEHYU99peS88wDDAFOcSm3Af5VO1tdrdgq1xPu_fpSSjsqPcoeABUs_NCyY33WIH", "gZrZr2-7s80CEsGpAHqFgREMbRWkR3L8__tkje3j-oKtIDlmn5KCR6bXD8i0HFp1", NULL);
$callback = "http://".$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF']."?action=getaccesstoken";
# First time through, get a request token from LinkedIn.
if (!isset($_GET['action'])) {
$req_req = OAuthRequest::from_consumer_and_token($test_consumer, NULL, "POST", $domain . "/requestToken");
$req_req->set_parameter("oauth_callback", $callback); # part of OAuth 1.0a - callback now in requestToken
$req_req->sign_request($sig_method, $test_consumer, NULL);
$ch = curl_init();
// make sure we submit this as a post
curl_setopt($ch, CURLOPT_POSTFIELDS, ''); //New Line
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_HTTPHEADER,array (
$req_req->to_header()
));
curl_setopt($ch, CURLOPT_URL, $domain . "/requestToken");
curl_setopt($ch, CURLOPT_POST, 1);
$output = curl_exec($ch);
curl_close($ch);
//print_r($req_req); //<---- add this line
//print("$output\n"); //<---- add this line
parse_str($output, $oauth);
# pop these in the session for now - there's probably a more secure way of doing this! We'll need them when the callback is called.
$_SESSION['oauth_token'] = $oauth['oauth_token'];
$_SESSION['oauth_token_secret'] = $oauth['oauth_token_secret'];
# Redirect the user to the authentication/authorisation page. This will authorise the token in LinkedIn
Header('Location: ' . $domain . '/authorize?oauth_token=' . $oauth['oauth_token']);
#print 'Location: ' . $domain . '/authorize?oauth_token=' . $oauth['oauth_token']; // <---- add this line
} else {
# this is called when the callback is invoked. At this stage, the user has authorised the token.
# Now use this token to get a real session token!
//print "oauth_token = [[".$_REQUEST['oauth_token']."]]\n";echo "<br/><br/>";
$req_token = new OAuthConsumer($_REQUEST['oauth_token'], $_SESSION['oauth_token_secret'], 1);
$acc_req = OAuthRequest::from_consumer_and_token($test_consumer, $req_token, "POST", $domain . '/accessToken');
$acc_req->set_parameter("oauth_verifier", $_REQUEST['oauth_verifier']); # need the verifier too!
$acc_req->sign_request($sig_method, $test_consumer, $req_token);
$ch = curl_init();
curl_setopt($ch, CURLOPT_POSTFIELDS, ''); //New Line
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_HTTPHEADER,array (
$acc_req->to_header()
));
curl_setopt($ch, CURLOPT_URL, $domain . "/accessToken");
curl_setopt($ch, CURLOPT_POST, 1);
$output = curl_exec($ch);
if(curl_errno($ch)){
echo 'Curl error 1: ' . curl_error($ch);
}
curl_close($ch);
parse_str($output, $oauth);
$_SESSION['oauth_token'] = $oauth['oauth_token'];
$_SESSION['oauth_token_secret'] = $oauth['oauth_token_secret'];
# Now you have a session token and secret. Store these for future use. When the token fails, repeat the above process.
//$endpoint = "http://in.linkedin.com/in/intercom"; # need a + symbol here.
$endpoint = "http://api.linkedin.com/v1/people/~:(id,first-name,last-name,headline,industry,educations,site-standard-profile-request)";
//$req_token = new OAuthConsumer($oauth['oauth_token'], $oauth['oauth_token_secret'], 1);
$req_token = new OAuthConsumer($oauth['oauth_token'],$oauth['oauth_token_secret'], 1);
//$profile_req = OAuthRequest::from_consumer_and_token($test_consumer, $req_token, "GET", $endpoint, array("name" => "intercom")); # but no + symbol here!
$profile_req = OAuthRequest::from_consumer_and_token($test_consumer,$req_token, "GET", $endpoint, array());
$profile_req->sign_request($sig_method, $test_consumer, $req_token);
$ch = curl_init();
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_HTTPHEADER,array (
$profile_req->to_header()
));
curl_setopt($ch, CURLOPT_URL, $endpoint);
$output = curl_exec($ch);
if(curl_errno($ch)){
echo 'Curl error 2: ' . curl_error($ch);
}
curl_close($ch);
//header ("Content-Type:text/xml");
//print $output;
$myFile = $_SERVER['DOCUMENT_ROOT']."/oauth/linkedin.xml";
$fh = fopen($myFile, 'w') or die("can't open file");
//$stringData = "Bobby Bopper\n";
fwrite($fh, $output);
fclose($fh);
//Initialize the XML parser
global $currentTag;
global $profileArray;
$parser=xml_parser_create();
//Function to use at the start of an element
function start($parser,$element_name,$element_attrs) {
$element_name = strtolower($element_name);
global $currentTag;
$currentTag = $element_name;
/*switch($element_name) {
case "person":
$currentTag = $element_name;
break;
case "headline":
echo "headline: ";
break;
case "school-name":
echo "school-name: ";
break;
case "degree":
echo "degree: ";
break;
case "field-of-study":
echo "field-of-study: ";
}*/
}
//Function to use at the end of an element
function stop($parser,$element_name) {}
//Function to use when finding character data
function char($parser,$data){
//echo $data;
global $currentTag;
global $profileArray;
switch($currentTag) {
/* case "member-url":
if(!isset($profileArray['member-url'])) {
$profileArray['member-url'] = $data;//echo $profileArray['industry'];
}
break;*/
case "id":
if(!isset($profileArray['id'])) {
$profileArray['id'] = $data;//echo $profileArray['industry'];
}
break;
case "site-standard-profile-request":
if(!isset($profileArray['site-standard-profile-request'])) {
$profileArray['site-standard-profile-request'] = $data;//echo $profileArray['industry'];
}
break;
case "first-name":
if(!isset($profileArray['first-name'])) {
$profileArray['first-name'] = $data;//echo $profileArray['industry'];
}
break;
case "last-name":
if(!isset($profileArray['last-name'])) {
$profileArray['last-name'] = $data;//echo $profileArray['industry'];
}
break;
case "industry":
if(!isset($profileArray['industry'])) {
$profileArray['industry'] = $data;//echo $profileArray['industry'];
}
break;
case "headline":
if(!isset($profileArray['headline'])) {
$profileArray['headline'] = $data;
}
break;
case "school-name":
if(!isset($profileArray['school-name'])) {
$profileArray['school-name'] = $data;
}
break;
case "degree":
if(!isset($profileArray['degree'])) {
$profileArray['degree'] = $data;
}
break;
case "field-of-study":
if(!isset($profileArray['field-of-study'])) {
$profileArray['field-of-study'] = $data;
}
break;
}
}
//Specify element handler
xml_set_element_handler($parser,"start","stop");
//Specify data handler
xml_set_character_data_handler($parser,"char");
//Open XML file
$fp=fopen($_SERVER['DOCUMENT_ROOT']."/oauth/linkedin.xml","r");
//Read data
while ($data=fread($fp,4096)) {
xml_parse($parser,$data,feof($fp)) or
die (sprintf("XML Error: %s at line %d",
xml_error_string(xml_get_error_code($parser)),
xml_get_current_line_number($parser)));
}
//Free the XML parser
xml_parser_free($parser);
print_r($profileArray);
getCurrentCookieValue($name)
}

Answer 2

you can use linkedIn javascript API to retrieve profile information