YahooOAuth2.class.php

<?php
/*
Example class to access Yahoo OAuth2 protected APIs, based on https://developer.yahoo.com/oauth2/guide/
Find documentation and support on Yahoo Developer Network: https://developer.yahoo.com/forums

*/

class YahooOAuth2 {

  const AUTHORIZATION_ENDPOINT  = 'https://api.login.yahoo.com/oauth2/request_auth';
  const TOKEN_ENDPOINT   = 'https://api.login.yahoo.com/oauth2/get_token';

  public function fetch($url,$postdata="",$auth="",$headers="") {
        $curl = curl_init($url); 
	if($postdata) {
            curl_setopt($curl, CURLOPT_POST, true); 
	    curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($postdata));
	} 
	else {
	    curl_setopt($curl, CURLOPT_POST, false);
	}
	if($auth){
	    curl_setopt($curl, CURLOPT_USERPWD, $auth);
	}
	if($headers){
	    curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
	}
	curl_setopt($curl, CURLOPT_HEADER, false);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true); 
        $response = curl_exec( $curl );
        if (empty($response)) {
            // some kind of an error happened
            die(curl_error($curl));
            curl_close($curl); // close cURL handler
        } else {
            $info = curl_getinfo($curl);
            curl_close($curl); // close cURL handler
            if($info['http_code'] != 200 && $info['http_code'] != 201 ) {
                echo "Received error: " . $info['http_code']. "\n";
                echo "Raw response:".$response."\n";
                die();
            }
        }
        return $response;
  }
  public function getAuthorizationURL($client_id,$redirect_uri,$language="en-us") {
        $url = self::AUTHORIZATION_ENDPOINT;
        $authorization_url=$url.'?'.'client_id='.$client_id.'&redirect_uri='.$redirect_uri.'&language='.$language.'&response_type=code';
        return $authorization_url;
  }


  public function get_access_token($clientId, $clientSecret,$redirect_uri,$code) {
        $url=self::TOKEN_ENDPOINT;
        $postdata=array("redirect_uri"=>$redirect_uri,"code"=>$code,"grant_type"=>"authorization_code");
	$auth=$clientId . ":" . $clientSecret;
        $response=self::fetch($url,$postdata,$auth); 

	// Convert the result from JSON format to a PHP array 
	$jsonResponse = json_decode( $response );
	return $jsonResponse->access_token;
  }

}

?>