編集:これを行った後、実際のビデオ ファイルではなく、YouTube ビデオの埋め込みを使用していることに気付きました。でも気にしないで、ここに置いておきます...
NodeJS についてどこにも言及していないので、ブラウザーの JS でこれを行うことを期待していると思います。しかし、ブラウザでこれを行うには、実際のビデオ URL をクライアントに送信し、URL 署名関数を公開する必要があります。これは、署名付き URL の目的を無効にします。
PHP を使用して試してみましたが、それほど複雑ではありません。プロセスは次のとおりです。
ユーザーがページをリクエストすると、一時的な URL を作成します。この URL には、ビデオへのファイルパスと有効期限を含む署名が含まれています。署名を翻訳し、すべてが正しければファイルを提供するページにつながります。
あなたがライブラリを使いたくないのはわかりますが、私は「自家製」のライブラリを使用しました。使用したファイル構造は次のとおりです。
/
├── libraries/
│ ├── VideoStream.php
│ └── VideoSignature.php
├── index.php
├── video.mp4
└── getVideo.php
ライブラリ/VideoSignature.php
ニーズに合わせて上部の設定を変更する必要があることに注意してください
<?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;
}
}
ライブラリ/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();
}
}
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>
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.";
}