Question

我是新手，学习网络开发等等。我只知道如何在网站上嵌入我的视频，并且可以通过任何新手轻松获得来源，他们也可以嵌入它。但是在很多网站上，视频src都是用重定向器链接编码的，例如：https://redirector.googlevideo.com/videoplayback?requiressl=yes&id=0c5d32687bb8e7fd&itag=18&source=webdrive&ttl=transient&app=explorer&ip=2604:a880:0:1010::dc7:d001&ipbits=32&expire=1481329545&sparams=requiressl%2Cid%2Citag%2Csource%2Cttl%2Cip%2Cipbits%2Cexpire&signature=8094D8DEF3C98784DC5561980B5725379B61A804.4C63CCB219699C4A2C02FB2606425E50243F8D36&key=ck2&mm=31&mn=sn-ab5l6ne6&ms=au&mt=1481314943&mv=m&nh=IgpwcjA0LmxnYTA3KgkxMjcuMC4wLjE&pl=48

一段时间后过期，在这种情况下，一天。我已经知道这是一个签名的网址。

所以，我想知道如何创建这样的签名网址。请不要给任何插件名称因为我不是付费用户或我只使用博客的任何东西。我只是想学习如何用javascript编写代码。

简而言之，我想让我们说，我的嵌入式YouTube视频的来源是一个签名的网址，它会在一小时后过期，并且网站刷新时来源应该不断变化。

Answer 1

编辑：执行此操作后，我发现您使用的是YouTube视频嵌入，而不是实际的视频文件。但是没关系，我会把它留在这里......

由于你没有在任何地方提到NodeJS，我猜你期望在浏览器中用JS做这件事。但是为了在浏览器中实现这一点，您需要将真实的视频URL发送到客户端，并向公众公开您的URL签名功能。这违背了签署网址的目的。

我尝试使用PHP，并不是很复杂。这是过程：

当用户请求您的页面时，您可以为他创建一个临时URL。此URL包含签名，其中包含视频的文件路径和到期日期。它会导致一个翻译签名的页面，如果一切正确，则会提供文件。

我看到你不想使用库，但我使用了“自制”库，这将有助于保持组织良好。这是我使用的文件结构：

/
├── libraries/
│   ├── VideoStream.php
│   └── VideoSignature.php
├── index.php
├── video.mp4
└── getVideo.php

<强>库/ VideoSignature.php

请注意，您需要更改顶部的设置以满足您的需求

<?php

/*
 * This class allows you to:
 * - Encrypt filepaths and expiration dates into signatures
 * - Decrypt signatures into filepaths and expiration dates
 *
 *
 * Note: String encryption functions were found here:
 * http://stackoverflow.com/a/1289114/1913729
 */

class VideoSignature
{
    // Time before a URL expires, in seconds
    private $expires = 10;
    // Key used to sign your URLs
    private $encryption_key = 'soMeStr0ngP455W0rD!!';
    // Public URL used to serve the content
    private $proxy_url = '/getVideo.php';

    // Encrypts a string
    private function encryptStr($str){
        $iv = mcrypt_create_iv(
            mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC),
            MCRYPT_DEV_URANDOM
        );

        $encrypted = base64_encode(
            $iv .
            mcrypt_encrypt(
                MCRYPT_RIJNDAEL_128,
                hash('sha256', $this->encryption_key, true),
                $str,
                MCRYPT_MODE_CBC,
                $iv
            )
        );

        return $encrypted;
    }

    // Decrypts a String
    private function decryptStr($str){
        $data = base64_decode($str);
        $iv = substr($data, 0, mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC));

        $decrypted = rtrim(
            mcrypt_decrypt(
                MCRYPT_RIJNDAEL_128,
                hash('sha256', $this->encryption_key, true),
                substr($data, mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC)),
                MCRYPT_MODE_CBC,
                $iv
            ),
            "\0"
        );

        return $decrypted;
    }

    // Returns a temporary URL
    public function getSignedURL($filepath){
        $data = json_encode(
                array(
                    "filepath" => $filepath,
                    "expires" => time() + $this->expires
                )
            );

        $signature = $this->encryptStr($data);

        return $this->proxy_url . "?s=" . urlencode($signature);
    }

    // Returns a filepath from a signature if it did not expire
    public function getFilepath($signature){
        $data = json_decode( $this->decryptStr($signature), true);

        if($data !== null && $data['expires'] > time() && file_exists($data['filepath'])){
            return $data['filepath'];
        }

        return false;
    }
}

<强>库/ VideoStream.php

<?php

/*
 * This class was found here:
 * http://stackoverflow.com/a/39897793/1913729
 *
 * It allows you to stream video without giving the real file URL
 */

class VideoStream
{
    private $path = "";
    private $stream = "";
    private $buffer = 102400;
    private $start  = -1;
    private $end    = -1;
    private $size   = 0;

    function __construct($filePath) 
    {
        $this->path = $filePath;
    }

    /**
     * Open stream
     */
    private function open()
    {
        if (!($this->stream = fopen($this->path, 'rb'))) {
            die('Could not open stream for reading');
        }

    }

    /**
     * Set proper header to serve the video content
     */
    private function setHeader()
    {
        ob_get_clean();
        header("Content-Type: video/mp4");
        header("Cache-Control: max-age=2592000, public");
        header("Expires: ".gmdate('D, d M Y H:i:s', time()+2592000) . ' GMT');
        header("Last-Modified: ".gmdate('D, d M Y H:i:s', @filemtime($this->path)) . ' GMT' );
        $this->start = 0;
        $this->size  = filesize($this->path);
        $this->end   = $this->size - 1;
        header("Accept-Ranges: 0-".$this->end);

        if (isset($_SERVER['HTTP_RANGE'])) {

            $c_start = $this->start;
            $c_end = $this->end;

            list(, $range) = explode('=', $_SERVER['HTTP_RANGE'], 2);
            if (strpos($range, ',') !== false) {
                header('HTTP/1.1 416 Requested Range Not Satisfiable');
                header("Content-Range: bytes $this->start-$this->end/$this->size");
                exit;
            }
            if ($range == '-') {
                $c_start = $this->size - substr($range, 1);
            }else{
                $range = explode('-', $range);
                $c_start = $range[0];

                $c_end = (isset($range[1]) && is_numeric($range[1])) ? $range[1] : $c_end;
            }
            $c_end = ($c_end > $this->end) ? $this->end : $c_end;
            if ($c_start > $c_end || $c_start > $this->size - 1 || $c_end >= $this->size) {
                header('HTTP/1.1 416 Requested Range Not Satisfiable');
                header("Content-Range: bytes $this->start-$this->end/$this->size");
                exit;
            }
            $this->start = $c_start;
            $this->end = $c_end;
            $length = $this->end - $this->start + 1;
            fseek($this->stream, $this->start);
            header('HTTP/1.1 206 Partial Content');
            header("Content-Length: ".$length);
            header("Content-Range: bytes $this->start-$this->end/".$this->size);
        }
        else
        {
            header("Content-Length: ".$this->size);
        }  

    }

    /**
     * close curretly opened stream
     */
    private function end()
    {
        fclose($this->stream);
        exit;
    }

    /**
     * perform the streaming of calculated range
     */
    private function stream()
    {
        $i = $this->start;
        set_time_limit(0);
        while(!feof($this->stream) && $i <= $this->end) {
            $bytesToRead = $this->buffer;
            if(($i+$bytesToRead) > $this->end) {
                $bytesToRead = $this->end - $i + 1;
            }
            $data = fread($this->stream, $bytesToRead);
            echo $data;
            flush();
            $i += $bytesToRead;
        }
    }

    /**
     * Start streaming video content
     */
    function start()
    {
        $this->open();
        $this->setHeader();
        $this->stream();
        $this->end();
    }
}

<强>的index.php

<?php

// Load the signature helper functions
include "libraries/VideoSignature.php";
$vs = new VideoSignature();

?><!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Check out my video!</title>
</head>
<body>
    <!-- /!\ Here, you need to insert a path to your video,
         relative to the getVideo.php file, not an actual URL! -->
    <video src="<?=$vs->getSignedURL("server/path/to/video.mp4");?>"></video>
</body>
</html>

<强> getVideo.php

<?php

// Load the signature helper functions
include "libraries/VideoSignature.php";
$vs = new VideoSignature();
// Load the video streaming functions
include "libraries/VideoStream.php";


if(isset($_REQUEST['s']) && $filepath = $vs->getFilepath($_REQUEST['s'])){
    $stream = new VideoStream($filepath);
    $stream->start();
} else {
    header("HTTP/1.0 403 Forbidden");
    echo "This URL has expired.";
}

如何制作过期/签名视频嵌入网址

1 个答案: