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<?php

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/**

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* Class for requesting oauth2 access token.

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* @package twitter-api-v2

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namespace TwitterFeed\V2;

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// Don't load directly.

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if (! defined('ABSPATH')) {

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die('-1');

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}

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/**

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* TwitterHelperApi class.

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class TwitterHelperApi {

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/**

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* Access token transient key.

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* @const string

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const ACCESS_TOKEN_TRANSIENT_KEY = 'sb_twitter_oauth_bearer_access_token_cache';

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/**

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* Consumer key.

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* @var string

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private $consumer_key;

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/**

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* Consumer secret.

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* @var string

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private $consumer_secret;

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/**

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* Constructor.

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* @param string $consumer_key Consumer key.

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* @param string $consumer_secret Consumer secret.

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public function __construct($consumer_key, $consumer_secret) {

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$this->consumer_key = $consumer_key;

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$this->consumer_secret = $consumer_secret;

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}

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/**

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* Get access token using consumer key and consumer secret.

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* @param string $consumer_key Consumer Key.

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* @param string $consumer_secret Consumer Secret.

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* @return false|string

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public function getAccessToken($consumer_key, $consumer_secret)

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{

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$url = 'https://api.twitter.com/oauth2/token';

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$args = [

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'headers' => [

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'Authorization' => 'Basic ' . base64_encode($consumer_key . ':' . $consumer_secret),

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'body' => [

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'grant_type' => 'client_credentials',

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];

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$response = wp_remote_post($url, $args);

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if (is_wp_error($response)) {

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return false;

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}

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$remote_post_response_body = wp_remote_retrieve_body($response);

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$array_response = json_decode($remote_post_response_body, ARRAY_A);

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if (empty($array_response['access_token'])) {

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return false;

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}

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return $array_response['access_token'];

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}

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/**

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* Check if cached twitter access token is valid .

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* @param string $twitter_oauth_access_token_cache Access token cache.

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* @param string $current_hash Current hash.

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* @return bool

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public function isCachedTwitterAccessTokenValid($twitter_oauth_access_token_cache, $current_hash)

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{

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// If nothing is saved into the cache, invalidate cache.

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if (false === $twitter_oauth_access_token_cache) {

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return false;

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}

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// If the reference hash is missing, invalidate cache.

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if (empty($twitter_oauth_access_token_cache['reference_hash'])) {

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return false;

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}

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// If the consumer key and consumer secret got changed from the settings, invalidate cache.

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if ($twitter_oauth_access_token_cache['reference_hash'] !== $current_hash) {

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return false;

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}

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// If the access token is empty, invalidate cache.

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if (empty($twitter_oauth_access_token_cache['access_token'])) {

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return false;

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}

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return true;

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}

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/**

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* Get cached twitter access token.

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* @return null|string

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public function getCachedTwitterAccessToken()

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{

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$twitter_oauth_access_token_cache = get_transient(static::ACCESS_TOKEN_TRANSIENT_KEY);

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$current_hash = md5($this->consumer_key . ':' . $this->consumer_secret);

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if (!$this->isCachedTwitterAccessTokenValid($twitter_oauth_access_token_cache, $current_hash)) {

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$twitter_oauth_access_token = $this->getAccessToken($this->consumer_key, $this->consumer_secret);

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if ($twitter_oauth_access_token) {

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set_transient(

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'sb_twitter_oauth_bearer_access_token_cache',

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[

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'access_token' => $twitter_oauth_access_token,

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'reference_hash' => $current_hash,

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MONTH_IN_SECONDS

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);

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}

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return $twitter_oauth_access_token;

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}

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return $twitter_oauth_access_token_cache['access_token'];

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}

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}

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