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<?php |
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namespace ProtoneMedia\LaravelFFMpeg\Exporters; |
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use Closure; |
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use Illuminate\Support\Str; |
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use ProtoneMedia\LaravelFFMpeg\FFMpeg\StdListener; |
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use ProtoneMedia\LaravelFFMpeg\Filesystem\Disk; |
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trait EncryptsHLSSegments |
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{ |
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/** |
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* The encryption key. |
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* |
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* @var string |
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*/ |
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private $encryptionKey; |
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private $newEncryptionKeyCallback = null; |
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private $encryptionKeyDisk = null; |
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private $encryptionKeyName = null; |
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private $encryptionIV = null; |
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private $rotatingEncryptiongKey = false; |
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private $segmentsOpenend = 0; |
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public function onEncryptionKey(Closure $callback): self |
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{ |
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$this->newEncryptionKeyCallback = $callback; |
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return $this; |
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} |
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/** |
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* Creates a new encryption key. |
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* |
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* @return string |
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*/ |
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public static function generateEncryptionKey(): string |
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{ |
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return random_bytes(16); |
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} |
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/** |
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* Sets the encryption key with the given value or generates a new one. |
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* |
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* @param string $key |
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* @return self |
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*/ |
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public function withEncryptionKey($key = null): self |
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{ |
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$this->encryptionKey = $key ?: static::generateEncryptionKey(); |
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return $this; |
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} |
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public function withRotatingEncryptionKey(): self |
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{ |
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$this->withEncryptionKey(); |
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$this->rotatingEncryptiongKey = true; |
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return $this; |
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} |
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private function rotateEncryptionKey() |
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{ |
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$this->withEncryptionKey(); |
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if (!$this->encryptionKeyDisk) { |
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$this->encryptionKeyDisk = Disk::makeTemporaryDisk(); |
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} |
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if (!$this->encryptionKeyName) { |
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$this->encryptionKeyName = Str::random(8); |
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} |
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if (!$this->encryptionIV) { |
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$this->encryptionIV = bin2hex(static::generateEncryptionKey()); |
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} |
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$keyInfoPath = $this->encryptionKeyDisk |
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->makeMedia("{$this->encryptionKeyName}.keyinfo") |
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->getLocalPath(); |
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$name = $this->encryptionKeyName . "_" . Str::random(8); |
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$keyPath = $this->encryptionKeyDisk->makeMedia("{$name}.key")->getLocalPath(); |
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file_put_contents($keyPath, $this->encryptionKey); |
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file_put_contents($keyInfoPath, implode(PHP_EOL, [ |
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$keyPath, $keyPath, $this->encryptionIV, |
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])); |
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if ($this->newEncryptionKeyCallback) { |
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call_user_func($this->newEncryptionKeyCallback, "{$name}.key", $this->encryptionKey); |
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} |
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return $keyInfoPath; |
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} |
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private function getEncrypedHLSParameters(): array |
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{ |
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if (!$this->encryptionKey) { |
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return []; |
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} |
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$hlsParameters = [ |
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'-hls_key_info_file', |
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$this->rotateEncryptionKey(), |
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]; |
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if ($this->rotatingEncryptiongKey) { |
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$hlsParameters[] = '-hls_flags'; |
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$hlsParameters[] = 'periodic_rekey'; |
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} |
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return $hlsParameters; |
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} |
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private function addRotatingKeyListener() |
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{ |
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if (!$this->rotatingEncryptiongKey) { |
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return; |
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} |
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$this->addListener(new StdListener)->onEvent('listen', function ($line) { |
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if (!(Str::contains($line, "Opening 'crypto:/") && Str::contains($line, ".ts' for writing"))) { |
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return; |
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} |
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$this->segmentsOpenend++; |
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$this->rotateEncryptionKey(); |
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}); |
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} |
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} |
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protonemedia /
laravel-ffmpeg
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