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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 $onNewEncryptionKey = null; |
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private $encryptionSecretsDisk = null; |
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private $encryptionInfoFilename = 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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/** |
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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 $key |
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* @return self |
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*/ |
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private function setEncryptionKey($key = null): self |
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{ |
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return $this->encryptionKey = $key ?: static::generateEncryptionKey(); |
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} |
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/** |
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* Initialises the disk, info and IV for encryption and sets the key. |
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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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$this->encryptionSecretsDisk = Disk::makeTemporaryDisk(); |
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$this->encryptionInfoFilename = Str::random(8) . ".keyinfo"; |
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$this->encryptionIV = bin2hex(static::generateEncryptionKey()); |
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return tap($this)->setEncryptionKey($key); |
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} |
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/** |
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* Enables encryption with rotating keys. |
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* |
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* @return self |
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*/ |
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public function withRotatingEncryptionKey(): self |
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{ |
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$this->rotatingEncryptiongKey = true; |
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return $this->withEncryptionKey(); |
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} |
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/** |
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* A callable for each key that is generated. |
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* |
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* @param Closure $callback |
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* @return self |
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*/ |
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public function onNewEncryptionKey(Closure $callback): self |
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{ |
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$this->onNewEncryptionKey = $callback; |
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return $this; |
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} |
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private function rotateEncryptionKey() |
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{ |
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// randomize the encryption key |
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$this->encryptionSecretsDisk->put( |
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$keyFilename = Str::random(8) . '.key', |
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$encryptionKey = $this->setEncryptionKey() |
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); |
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$keyPath = $this->encryptionSecretsDisk->makeMedia($keyFilename)->getLocalPath(); |
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$this->encryptionSecretsDisk->put($this->encryptionInfoFilename, implode(PHP_EOL, [ |
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$keyPath, $keyPath, $this->encryptionIV, |
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])); |
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if ($this->onNewEncryptionKey) { |
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call_user_func($this->onNewEncryptionKey, $keyFilename, $encryptionKey); |
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} |
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return $this->encryptionSecretsDisk |
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->makeMedia($this->encryptionInfoFilename) |
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->getLocalPath(); |
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} |
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private function getEncrypedHLSParameters(): array |
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{ |
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if (!$this->encryptionKey) { |
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return []; |
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} |
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$keyInfoPath = $this->rotateEncryptionKey(); |
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$parameters = ['-hls_key_info_file', $keyInfoPath]; |
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if ($this->rotatingEncryptiongKey) { |
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$parameters[] = '-hls_flags'; |
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$parameters[] = 'periodic_rekey'; |
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} |
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return $parameters; |
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} |
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private function addHandlerToRotateEncryption() |
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{ |
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if (!$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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$opensEncryptedSegment = Str::contains($line, "Opening 'crypto:/") |
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&& Str::contains($line, ".ts' for writing"); |
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if (!$opensEncryptedSegment) { |
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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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private function cleanupHLSEncryption() |
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{ |
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if (!$this->encryptionSecretsDisk) { |
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return; |
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} |
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$paths = $this->encryptionSecretsDisk->allFiles(); |
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foreach ($paths as $path) { |
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$this->encryptionSecretsDisk->delete($path); |
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} |
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} |
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} |
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protonemedia /
laravel-ffmpeg
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