Oinktube/plugin/Cache/Cache.php

<?php
require_once $global['systemRootPath'] . 'plugin/Plugin.abstract.php';

class Cache extends PluginAbstract {

    public function getDescription() {
        $txt = "AVideo application accelerator to cache pages.<br>Your website has 10,000 visitors who are online, and your dynamic page has to send 10,000 times the same queries to database on every page load. With this plugin, your page only sends 1 query to your DB, and uses the cache to serve the 9,999 other visitors.";
        $help = "<br><small><a href='https://github.com/WWBN/AVideo/wiki/Cache-Plugin' target='__blank'><i class='fas fa-question-circle'></i> Help</a></small>";
        return $txt . $help;
    }

    public function getName() {
        return "Cache";
    }

    public function getUUID() {
        return "10573225-3807-4167-ba81-0509dd280e06";
    }

    public function getPluginVersion() {
        return "1.0";
    }

    public function getEmptyDataObject() {
        global $global;
        $obj = new stdClass();
        $obj->enableCachePerUser = false;
        $obj->enableCacheForLoggedUsers = false;
        $obj->cacheTimeInSeconds = 600;
        $obj->cacheDir = $global['systemRootPath'] . 'videos/cache/';
        $obj->logPageLoadTime = false;
        $obj->stopBotsFromNonCachedPages = false;
        return $obj;
    }

    public function getTags() {
        return array('free', 'cache', 'speed up');
    }

    private function getFileName() {
        if (empty($_SERVER['REQUEST_URI'])) {
            $_SERVER['REQUEST_URI'] = "";
        }
        $obj = $this->getDataObject();
        $session_id = "";
        if (!empty($obj->enableCachePerUser)) {
            $session_id = session_id();
        }
        return User::getId() . "_" . md5($_SERVER['REQUEST_URI'] . $_SERVER['HTTP_HOST']) . "_" . $session_id . "_" . (!empty($_SERVER['HTTPS']) ? 'a' : ''). (@$_SESSION['language']) . '.cache';
    }

    private function isFirstPage() {
        // can not process
        if (empty($_SERVER['HTTP_HOST'])) {
            //$str = "isFirstPage: Empty HTTP_HOST, IP: ". getRealIpAddr()." SERVER: ".  json_encode($_SERVER);
            //error_log($str);
            die();
        }
        global $global;
        $actual_link = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on' ? "https" : "http") . "://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
        $actual_link = rtrim($actual_link, '/') . '/';
        if ($global['webSiteRootURL'] === $actual_link) {
            return true;
        }
        $regExp = "/". str_replace("/", '\/', $global['webSiteRootURL'])."\?showOnly=/";
        //echo $regExp;
        if(preg_match($regExp, $actual_link)){
            return true;
        }
        return false;
    }

    public function getStart() {
        global $global;
        // ignore cache if it is command line

        $obj = $this->getDataObject();
        if ($obj->logPageLoadTime) {
            $this->start();
        }
        
        if (isCommandLineInterface()) {
            return true;
        }

        $whitelistedFiles = array('user.php', 'status.php', 'canWatchVideo.json.php', '/login', '/status');
        $blacklistedFiles = array('videosAndroid.json.php');
        $baseName = basename($_SERVER["SCRIPT_FILENAME"]);
        if (!empty($_GET["videoName"]) || in_array($baseName, $whitelistedFiles) || in_array($_SERVER['REQUEST_URI'], $whitelistedFiles) ) {
            return true;
        }
        
        $isBot = isBot();
        if ($this->isBlacklisted() || $this->isFirstPage() || !class_exists('User') || !User::isLogged() || !empty($obj->enableCacheForLoggedUsers)) {
            $cachefile = $obj->cacheDir . $this->getFileName(); // e.g. cache/index.php.
            $lifetime = $obj->cacheTimeInSeconds;
            if (!empty($_GET['lifetime'])) {
                $lifetime = intval($_GET['lifetime']);
            }
            // if is a bot always show a cache
            if (file_exists($cachefile) && (((time() - $lifetime) <= filemtime($cachefile)) || $isBot)) {
                if($isBot && $_SERVER['REQUEST_URI'] !== '/login'){
                    error_log("Bot Detected, showing the cache ({$_SERVER['REQUEST_URI']}) FROM: {$_SERVER['REMOTE_ADDR']} Browser: {$_SERVER['HTTP_USER_AGENT']}");
                }
                $c = @local_get_contents($cachefile);
                if(preg_match("/\.json\.?/", $baseName)){
                    header('Content-Type: application/json');
                }
                echo $c;
                if ($obj->logPageLoadTime) {
                    $this->end("Cache");
                }
                exit;
            } else if (file_exists($cachefile)) {
                unlink($cachefile);
            }
        }
        
        if($isBot && strpos($_SERVER['REQUEST_URI'], 'aVideoEncoder') === false){
            if(empty($_SERVER['HTTP_USER_AGENT'])){
                $_SERVER['HTTP_USER_AGENT'] = "";
            }
            error_log("Bot Detected, NOT showing the cache ({$_SERVER['REQUEST_URI']}) FROM: {$_SERVER['REMOTE_ADDR']} Browser: {$_SERVER['HTTP_USER_AGENT']}");
            if($obj->stopBotsFromNonCachedPages){
                error_log("Bot stopped");
                exit;
            }
        }
        //ob_start('sanitize_output');
        ob_start();
    }
    
    private function isBlacklisted(){
        $blacklistedFiles = array('videosAndroid.json.php');
        $baseName = basename($_SERVER["SCRIPT_FILENAME"]);
        return in_array($baseName, $blacklistedFiles);
    }

    public function getEnd() {
        global $global;
        $obj = $this->getDataObject();
        $cachefile = $obj->cacheDir . $this->getFileName();
        $c = ob_get_contents();
        header_remove('Set-Cookie');
        if (!file_exists($obj->cacheDir)) {
            mkdir($obj->cacheDir, 0777, true);
        }
        if (!file_exists($obj->cacheDir)) {
            $obj->cacheDir = $global['systemRootPath'] . 'videos/cache/';
            $this->setDataObject($obj);
            if (!file_exists($obj->cacheDir)) {
                mkdir($obj->cacheDir, 0777, true);
            }
        }
        if ($this->isBlacklisted() || $this->isFirstPage() || !class_exists('User') || !User::isLogged() || !empty($obj->enableCacheForLoggedUsers)) {
            file_put_contents($cachefile, $c);
        }
        if ($obj->logPageLoadTime) {
            $this->end();
        }
    }

    private function start() {
        global $global;
        $time = microtime();
        $time = explode(' ', $time);
        $time = $time[1] + $time[0];
        $global['start'] = $time;
    }

    private function end($type = "No Cache") {
        global $global;
        if(empty($global['start'])){
            return false;
        }
        require_once $global['systemRootPath'] . 'objects/user.php';
        $time = microtime();
        $time = explode(' ', $time);
        $time = $time[1] + $time[0];
        $finish = $time;

        if (User::isLogged()) {
            $type = "User: " . User::getUserName() . " - " . $type;
        } else {
            $type = "User: Not Logged - " . $type;
        }
        $total_time = round(($finish - $global['start']), 4);
        error_log("Page generated in {$total_time} seconds. {$type} ({$_SERVER['REQUEST_URI']}) FROM: {$_SERVER['REMOTE_ADDR']} Browser: {$_SERVER['HTTP_USER_AGENT']}");
    }

}

function sanitize_output($buffer) {

    $search = array(
        '/\>[^\S ]+/s', // strip whitespaces after tags, except space
        '/[^\S ]+\</s', // strip whitespaces before tags, except space
        '/(\s)+/s', // shorten multiple whitespace sequences
        '/<!--(.|\s)*?-->/' // Remove HTML comments
    );

    $replace = array(
        '>',
        '<',
        '\\1',
        ''
    );

    $len = strlen($buffer);
    if ($len) {
        error_log("Before Sanitize: " . strlen($buffer));
        $buffer = preg_replace($search, $replace, $buffer);
        $lenAfter = strlen($buffer);
        error_log("After Sanitize: {$lenAfter} = " . (($len / $lenAfter) * 100) . "%");
    }
    return $buffer;
}