Laravel 4 Yahoo Contacts API Integration

Yahoo.php

<?php
/**
 * Author: Kenyon Haliwell 
 * Date: 10/22/14
 * 
 * Used to authenticate with Yahoo via oAuth2 and then use their Contacts API to return emails.
 * 
 * Step 1: send user to Yahoo@getContactsLink
 * Step 2: return user to a route that calls Yahoo@getContactsArray
 * Step 3: Whatever you wanted to do with the contacts
 * 
 * Note:    If using Laravel 4 I put this under app/models/oauth2/Yahoo.php
 * Note:    You can use this with any framework/code, just follow these couple steps:
 *          Step 1: Remove namespace
 *          Step 2: Change \Auth::user()->id to logged in users ID
 *          Step 3: Change \Input::get('thing') to $_GET['thing']
 *          Step 4: Change Session::put/Session::get/Session::pull to $_SESSION (add key=>value, get value, get value and unset)
 *          Step 5: Use like a regular class.
 */

namespace App\Models\oAuth2;

class Yahoo {
    static public $consumer_key     = 'xxx';
    static public $consumer_secret  = 'xxx';

    /**
     * Get the oAuth2 link
     *
     * @return mixed
     */
    static public function getContactsLink() {
        parse_str(self::curl('https://api.login.yahoo.com/oauth/v2/get_request_token', true, [
            'oauth_consumer_key'        => self::$consumer_key,
            'oauth_signature'           => self::$consumer_secret . '&',
            'oauth_signature_method'    => 'PLAINTEXT',
            'oauth_callback'            => 'http://example.com/whatever-url-has-the-call-to-Yahoo@getContactsArray',
            'oauth_nonce'               => uniqid(rand()),
            'oauth_timestamp'           => time(),
            'oauth_version'             => '1.0',
            'xoauth_lang_pref'          => 'en-us'
        ]), $response);

        \Session::put(\Auth::user()->id . '.oauth_token_secret', $response['oauth_token_secret']);

        return $response['xoauth_request_auth_url'];
    }

    /**
     * Get the oAuth2 access token
     *
     * @return mixed
     */
    static public function getAccessToken() {
        parse_str(self::curl(
            'https://api.login.yahoo.com/oauth/v2/get_token?oauth_consumer_key=' . self::$consumer_key .'&oauth_signature=' . self::$consumer_secret . '%26' . \Session::pull(\Auth::user()->id . '.oauth_token_secret') . '&oauth_signature_method=PLAINTEXT&oauth_nonce=' . uniqid(rand()) . '&oauth_timestamp=' . time() . '&oauth_version=1.0&oauth_verifier=' . \Input::get('oauth_verifier') . '&oauth_token=' . \Input::get('oauth_token')
        ), $response);

        return $response;
    }

    /**
     * Get the contacts and return them via array
     *
     * @return array
     */
    static public function getContactsArray() {
        $emails     = [];
        $response   = self::getAccessToken();
        $response   = self::curl('https://social.yahooapis.com/v1/user/' . $response['xoauth_yahoo_guid'] . '/contacts?format=json&oauth_token=' . urldecode($response['oauth_token']) . '&oauth_consumer_key=' . self::$consumer_key .'&oauth_signature=' . self::$consumer_secret . '%26' . $response['oauth_token_secret'] . '&oauth_signature_method=PLAINTEXT&oauth_nonce=' . uniqid(rand()) . '&oauth_timestamp=' . time() . '&oauth_version=1.0');

        $response = json_decode($response, true);

        foreach($response['contacts']['contact'] as $contact) {
            if (array_key_exists('fields', $contact) && array_key_exists(1, $contact['fields']) && 'email' == $contact['fields'][1]['type']) {
                $emails[] = $contact['fields']['1']['value'];
            }
        }

        return $emails;
    }

    /**
     * Used to perform curl requests for API interaction
     *
     * @param $url
     * @param bool $post
     * @param null $data
     * @return mixed
     */
    static public function curl($url, $post = false, $data = null) {
        $s = curl_init();
        curl_setopt($s,CURLOPT_URL, $url);
        curl_setopt($s,CURLOPT_RETURNTRANSFER, true);
        curl_setopt($s,CURLOPT_HEADER, false);

        if(true === $post) {
            curl_setopt($s,CURLOPT_POST, true);
            curl_setopt($s,CURLOPT_POSTFIELDS, $data);
        }

        $response = curl_exec($s);
        curl_close($s);

        return $response;
    }
}