IET-OU/open-media-player

<?php defined('BASEPATH') or exit('No direct script access allowed');
/**
 * Open Media Player helper functions.
 *
 * @copyright Copyright 2011 The Open University.
 * @author N.D.Freear.
 */


/** [Bug #59]
*/
function my_print_r($expression, $return = false)
{
    return print_r($expression, $return);
}

/** JSON encode a string, removing the outer quotes (").
*/
function json_encode_str($str)
{
    return str_replace("'", "\\'", trim(json_encode($str), '"{}'));
}

/** JSON encode an object, removing the outer braces {}.
*/
function json_encode_bare($obj, $parse_function = false)
{
    $json = str_replace("'", "\\'", trim(json_encode($obj), '{}'));

    if ($parse_function) {
        $json = preg_replace_callback(
            '/"\s*
             (?P<js_function>function\s*\(.+\})
             \s*"/x',
            function ($matches) {
                return strtr($matches['js_function'], array(
                '\r' => '',
                '\n' => "\n\t",
                '\t' => "\t",
                ))
                . "\n";
            },
            $json
        );
    }

    return $json;
}


/** Convert special characters '<', '"', etc. to HTML5 entities.
*
* @link http://stackoverflow.com/questions/13745353/what-do-the-ent-html5-ent-html401-modi ..
* @link http://php.net/manual/en/changelog.strings.php PHP 5.4+
*/
if (! defined('ENT_HTML401')) {
    define('ENT_HTML401', 0);
    define('ENT_XML1', 16);
    define('ENT_XHTML', 32);
    define('ENT_HTML5', 16|32);
}
function html_chars($str, $flags = null, $encoding = 'UTF-8', $double_encode = false)
{
    if (! $flags) {
        $flags = ENT_COMPAT | ENT_HTML5;
    }
    return htmlspecialchars($str, $flags, $encoding, $double_encode);
}


/** Does haystack contain needle? (Semantic wrapper around 'strpos')
*/
function contains($haystack, $needle)
{
    return false !== strpos($haystack, $needle);
}


/** The application or site name.
*/
function site_name()
{
    return 'Open Media Player';
}


// ====================================================================

/**
 * Site URL. (Based on `/system/helpers/url_helper.php`)
 * @return string
 */
if (! function_exists('site_url')) {
    function site_url($uri = '')
    {
        $CI =& get_instance();
        $forwarded_host = filter_input(INPUT_SERVER, 'HTTP_X_FORWARDED_HOST', FILTER_SANITIZE_URL);

        if ($forwarded_host) {
            $site_url = 'http://' . $forwarded_host . $CI->config->item('site_proxy_path') . $uri;
        } else {
            $site_url = $CI->config->site_url($uri);
        }
        return preg_replace('@https?:\/\/@', '//', $site_url);
    }
}


/**
 * Video/audio media and images stored on OU Podcasts [iet-it-bugs:1486]
 * @return string
 */
function media_url($uri, $return = false)
{
    $CI =& get_instance();
    $media_url_regex = $CI->config->item('https_media_url_regex');
    $media_url = preg_replace($media_url_regex, '//$1', $uri);
    if ($return) {
        return $media_url;
    }
    echo $media_url;
}

/**
* Output the URL for a Player-engine or theme resource.
* Note, the URL is HTTPS/SSL-neutral (//host/path) and contains a hash/version ID.
* @link http://google-styleguide.googlecode.com/svn/trunk/htmlcssguide.xml#Protocol
* @param string $uri Path
* @param bool $hash Whether to use a hash/version ID in the URL.
* @return string
*/
function player_res_url($uri = '', $hash = true, $return = false)
{
    static $base_url;
    if (! $base_url) {
        //Was: $base_url = preg_replace('@https?:\/\/@', '//', base_url());
        $p = parse_url(site_url());
        $base_url = $p[ 'path' ];
    }

    if ($hash) {
        $hash = '?v=0';
    } else {
        $hash = '';
    }

    if ($return) {
        return $base_url . $uri . $hash;
    }
    echo $base_url . $uri . $hash;
}

/**
* Output URL for a site resource - HTTPS/SSL-neutral [iet-it-bugs:1329]
* @return string
*/
function site_res_url($uri = '')
{
    $p = parse_url(base_url());
    $site_url = $p['path'] . $uri;

    return $site_url;
}

/**
* Get a Google Analytics ID, if available [iet-it-bugs:1486]
* @return string
*/
function google_analytics_id($key)
{
    $CI =& get_instance();
    $CI->config->load('providers');
    $ga_analytics_ids = $CI->config->item('provider_google_analytics_ids');
    return isset($ga_analytics_ids[$key]) ? $ga_analytics_ids[$key] : null;
}

// ====================================================================


/** Return class and aria-label attributes for player controls.
* @return string
*/
function _oupc_label($className, $text)
{
    return "class=\"$className\" aria-label=\"$text\"";
}

  /** Return the path for the main Flowplayer Flash file, based on config. variables.
  * @return string
  */
function _flowplayer_flash()
{
    $CI =& get_instance();
    $flowplayer_dev= $CI->config->item('flowplayer_dev');
    $flow_key      = $CI->config->item('flowplayer_key');
    $flow_commercial= $flow_key ? '.commercial' : '';
    $flow_version  = $CI->config->item('flowplayer_version');
    if (!$flow_version || !$flow_key) {
        $flow_version='3.2.7';
    }

    if ($flowplayer_dev) {
        return "assets/flowplayer_dev/flowplayer$flow_commercial.swf";
    }
    return "swf/flowplayer$flow_commercial-$flow_version.swf";
}

  /** Return the path for a Flowplayer Flash plugin, based on config. variables.
  * @return string
  */
function _flowplayer_plugin($name, $version)
{
    $flowplayer_dev = config_item('flowplayer_dev');
    if ($flowplayer_dev) {
        return "flowplayer.$name.swf";
    }
    return "flowplayer.$name-$version.swf";
}

function cache_exists($key)
{
    $CI =& get_instance();
    $CI->load->driver('cache', array('adapter'=>'file')); #,array('adapter'=>'apc', 'backup'=>'file'));
    $stat = $CI->cache->get_metadata($key);
    return (bool) $stat;
}

function cache_time($key)
{
    $CI =& get_instance();
    $CI->load->driver('cache', array('adapter'=>'file'));
    $stat = $CI->cache->get_metadata($key);

#var_dump($stat);
    return $stat['mtime'];
}