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Filename : tweet.php
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<?php
    require_once("twitteroauth/twitteroauth.php"); // Path to twitteroauth library
    require_once('config.php'); // Path to config file

    // Check if keys are in place
    if (CONSUMER_KEY === '' || CONSUMER_SECRET === '' || CONSUMER_KEY === 'CONSUMER_KEY_HERE' || CONSUMER_SECRET === 'CONSUMER_SECRET_HERE') {
        echo 'You need a consumer key and secret keys. Get one from <a href="https://dev.twitter.com/apps">dev.twitter.com/apps</a>';
      
        exit;
    }

    // If count of tweets is not fall back to default setting
    $username = filter_input(INPUT_GET, 'username', FILTER_SANITIZE_SPECIAL_CHARS);
    $number = filter_input(INPUT_GET, 'count', FILTER_SANITIZE_NUMBER_INT);
    $exclude_replies = filter_input(INPUT_GET, 'exclude_replies', FILTER_SANITIZE_SPECIAL_CHARS);
    $list_slug = filter_input(INPUT_GET, 'list_slug', FILTER_SANITIZE_SPECIAL_CHARS);
    $hashtag = filter_input(INPUT_GET, 'hashtag', FILTER_SANITIZE_SPECIAL_CHARS);
    
	if(CACHE_ENABLED) {
        // Generate cache key from query data
        $cache_key = md5(
            var_export(array($username, $number, $exclude_replies, $list_slug, $hashtag), true) . HASH_SALT
        );
    
        // Remove old files from cache dir
        $cache_path  = dirname(__FILE__) . '/cache/';
        foreach (glob($cache_path . '*') as $file) {
            if (filemtime($file) < time() - CACHE_LIFETIME) {
                unlink($file);
            }
        }
    
        // If cache file exists - return it
        if(file_exists($cache_path . $cache_key)) {
            header('Content-Type: application/json');
    
            echo file_get_contents($cache_path . $cache_key);
            exit;
        }
    }
	
    /**
     * Gets connection with user Twitter account
     * @param  String $cons_key     Consumer Key
     * @param  String $cons_secret  Consumer Secret Key
     * @param  String $oauth_token  Access Token
     * @param  String $oauth_secret Access Secrete Token
     * @return Object               Twitter Session
     */
    function getConnectionWithToken($cons_key, $cons_secret, $oauth_token, $oauth_secret)
    {
        $connection = new TwitterOAuth($cons_key, $cons_secret, $oauth_token, $oauth_secret);
      
        return $connection;
    }
    
    // Connect
    $connection = getConnectionWithToken(CONSUMER_KEY, CONSUMER_SECRET, ACCESS_TOKEN, ACCESS_SECRET);
    
    // Get Tweets
    if (!empty($list_slug)) {
      $params = array(
          'owner_screen_name' => $username,
          'slug' => $list_slug,
          'per_page' => $number
      );

      $url = '/lists/statuses';
    } else if($hashtag) {
      $params = array(
          'count' => $number,
          'q' => '#'.$hashtag
      );

      $url = '/search/tweets';
    } else {
      $params = array(
          'count' => $number,
          'exclude_replies' => $exclude_replies,
          'screen_name' => $username
      );

      $url = '/statuses/user_timeline';
    }

    $tweets = $connection->get($url, $params);

    // Return JSON Object
    header('Content-Type: application/json');

    $tweets = json_encode($tweets);
    if(CACHE_ENABLED) file_put_contents($cache_path . $cache_key, $tweets);
    echo $tweets;