记一次笔记，关于thinkphp视频防盗，防下载的demo

    public function pay(){
	    $id = $this->unlock_url(input('id')); 
        $video = db('videos')->where(['id'=>$id])->find();
        ini_set('memory_limit', '1024M'); //修改脚本的最大运行内存
        set_time_limit(600); //设置超时限制为 10分钟
        //视频地址可以换成你的来测试video.zkyswx.com
        if(strpos($video['path'],"video.com"))
            $play_url = $video['path'];
        else
            $play_url = 'http://'.$_SERVER['HTTP_HOST'].str_replace("\\",'/',$video['path']);
        //输出视频流 
        $this->outPutStream($play_url);
	}
     //输出视频流
    public function outPutStream($videoUrl) {
        echo $videoUrl;
        if(!$videoUrl){
            header('HTTP/1.1 500 Internal Server Error');
            echo "Error: Video cannot be played !";
            exit();
        }
        //获取视频大小
        $header_array = get_headers($videoUrl, true);
        $sizeTemp = $header_array['Content-Length'];
        if (is_array($sizeTemp)) {
            $size = $sizeTemp[count($sizeTemp) - 1];
        } else {
            $size = $sizeTemp;
        }
    
        //初始参数
        $start = 0;
        $end = $size - 1;
        $length = $size;
        $buffer = 1024 * 1024 * 10; // 输出的流大小 10m
    
        //计算 Range
        $ranges_arr = array();
        if (isset($_SERVER['HTTP_RANGE'])) {
            if (!preg_match('/^bytes=\d*-\d*(,\d*-\d*)*$/i', $_SERVER['HTTP_RANGE'])) {
                header('HTTP/1.1 416 Requested Range Not Satisfiable');
            }
            $ranges = explode(',', substr($_SERVER['HTTP_RANGE'], 6));
            foreach ($ranges as $range) {
                $parts = explode('-', $range);
                $ranges_arr[] = array($parts[0], $parts[1]);
            }
            $ranges = $ranges_arr[0];
            
            $start = (int)$ranges[0];
            if ($ranges[1] != '') {
                $end = (int)$ranges[1];
            }
            $length = min($end - $start + 1, $buffer);
            $end = $start + $length - 1;
        }else{
            // php 文件第一次浏览器请求不会携带 RANGE 为了提升加载速度 默认请求 1 个字节的数据
            $start=0;
            $end=1;
            $length=2;
        }
        //添加 Range 分段请求
        $header = array("Range:bytes={$start}-{$end}");
        #发起请求
        $ch2 = curl_init();
        curl_setopt($ch2, CURLOPT_URL, $videoUrl);
        curl_setopt($ch2, CURLOPT_TIMEOUT, 60);
        curl_setopt($ch2, CURLOPT_HTTPHEADER, $header);
        //设置读取的缓存区大小
        curl_setopt($ch2, CURLOPT_BUFFERSIZE, $buffer);
        // 关闭安全认证
        curl_setopt($ch2, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch2, CURLOPT_SSL_VERIFYHOST, false);
        //追踪返回302状态码，继续抓取
        curl_setopt($ch2, CURLOPT_HEADER, false);
        curl_setopt($ch2, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch2, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($ch2, CURLOPT_CONNECTTIMEOUT, 60);
        curl_setopt($ch2, CURLOPT_NOBODY, false);
        curl_setopt($ch2, CURLOPT_REFERER, $videoUrl);
        //模拟来路
        curl_setopt($ch2, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36 Edg/85.0.564.44");
        $content = curl_exec($ch2);
        curl_close($ch2);
        #设置响应头
        header('HTTP/1.1 206 PARTIAL CONTENT');
        header("Accept-Ranges: bytes");
        header("Connection: keep-alive");
        header("Content-Type: video/mp4");
        header("Access-Control-Allow-Origin: *");
        //为了兼容 ios UC这类浏览器 这里加个判断 UC的 Content-Range 是 起始值-总大小减一
        if($end!=1){
            $end=$size-1;
        }
        header("Content-Range: bytes {$start}-{$end}/{$size}");
        //设置流的实际大小
        header("Content-Length: ".strlen($content));
        //清空缓存区
        ob_clean();
        //输出视频流
        echo $content;
        die;
        //销毁内存
        unset($content);
    }
    
    function PutMovie($file) {
        ini_set('memory_limit','512M');
        header("Content-type: video/mp4");
        header("Accept-Ranges: bytes");
    
        ob_start();   // ------ 开启缓冲区
        $size = filesize($file);
    
        if(isset($_SERVER['HTTP_RANGE'])){
            header("HTTP/1.1 206 Partial Content");
            list($name, $range) = explode("=", $_SERVER['HTTP_RANGE']);
            list($begin, $end) =explode("-", $range);
            if($end == 0) $end = $size - 1;
        }else {
            $begin = 0; $end = $size - 1;
        }
    
        header("Content-Length: " . ($end - $begin + 1));
        header("Content-Disposition: filename=".basename($file));
        header("Content-Range: bytes ".$begin."-".$end."/".$size);
    
        try {
            $fp = fopen($file, 'r');
        } catch (\Exception $e) {
            echo $e->getTraceAsString();exit;
        }
        fseek($fp, $begin);
        $contents = '';
    
        while(!feof($fp)) {
            $p = min(1024, $end - $begin + 1);
            //$begin += $p;
            $contents .= fread($fp, $p);
            //echo fread($fp, $p);
        }
        //$contents = ltrim($contents, "\XEF\XBB\XBF");
        ob_end_clean();            // ------ 清除缓冲区
        ob_clean();
        //$contents = substr($contents, 3);
        fclose($fp);
    
        exit($contents);
    }
    
    function lock_url($txt,$key='str'){ 
        $txt = $txt.$key; 
        $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+"; 
        $nh = rand(0,64); 
        $ch = $chars[$nh]; 
        $mdKey = md5($key.$ch); 
        $mdKey = substr($mdKey,$nh%8, $nh%8+7); 
        $txt = base64_encode($txt); 
        $tmp = ''; 
        $i=0;$j=0;$k = 0; 
        for ($i=0; $i<strlen($txt); $i++) { 
            $k = $k == strlen($mdKey) ? 0 : $k; 
            $j = ($nh+strpos($chars,$txt[$i])+ord($mdKey[$k++]))%64; 
            $tmp .= $chars[$j]; 
        } 
        return urlencode(base64_encode($ch.$tmp)); 
    } 
    //解密函数 
    function unlock_url($txt,$key='str'){ 
        $txt = base64_decode(urldecode($txt)); 
        $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+"; 
        $ch = $txt[0]; 
        $nh = strpos($chars,$ch); 
        $mdKey = md5($key.$ch); 
        $mdKey = substr($mdKey,$nh%8, $nh%8+7); 
        $txt = substr($txt,1); 
        $tmp = ''; 
        $i=0;$j=0; $k = 0; 
        for ($i=0; $i<strlen($txt); $i++) { 
            $k = $k == strlen($mdKey) ? 0 : $k; 
            $j = strpos($chars,$txt[$i])-$nh - ord($mdKey[$k++]); 
            while ($j<0) $j+=64; 
            $tmp .= $chars[$j]; 
        } 
        return trim(base64_decode($tmp),$key); 
    }