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<?php |
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namespace LeKoala\Encrypt; |
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use Exception; |
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use SilverStripe\Assets\File; |
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use SilverStripe\ORM\DataExtension; |
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use ParagonIE\CipherSweet\CipherSweet; |
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use ParagonIE\CipherSweet\EncryptedFile; |
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use SilverStripe\Control\Director; |
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/** |
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* Safe and encrypted content file |
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* Also make sure that files are not public assets! => use htaccess |
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* @property bool $Encrypted |
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* @property File|EncryptedDBFile $owner |
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*/ |
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class EncryptedDBFile extends DataExtension |
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{ |
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private static $db = [ |
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"Encrypted" => "Boolean", |
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]; |
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/** |
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* @return EncryptedFile |
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*/ |
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protected function getEncryptedFileInstance() |
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{ |
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$engine = EncryptHelper::getCipherSweet(); |
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$encFile = new EncryptedFile($engine); |
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return $encFile; |
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} |
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/** |
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* @return string |
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*/ |
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public function getDecryptionLink() |
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{ |
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$data = [ |
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"ID" => $this->owner->ID, |
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"Hash" => substr($this->owner->File->Hash, 0, 10), |
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]; |
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$url = "__decrypt/?" . http_build_query($data); |
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return Director::absoluteURL($url); |
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} |
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/** |
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* Check if the actual file on the filesystem is encrypted |
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* You might also use the Encrypted field that should be accurate |
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* |
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* @return boolean |
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*/ |
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public function isEncrypted() |
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{ |
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$encFile = $this->getEncryptedFileInstance(); |
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$stream = $this->owner->getStream(); |
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return $encFile->isStreamEncrypted($stream); |
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} |
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/** |
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* Output file using regular php |
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* |
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* @throws Exception |
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* @return void |
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*/ |
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public function sendDecryptedFile() |
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{ |
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if (ob_get_level()) { |
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ob_end_clean(); |
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} |
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$stream = $this->owner->getStream(); |
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if ($this->owner->Encrypted) { |
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$encFile = $this->getEncryptedFileInstance(); |
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$output = fopen('php://temp', 'w+b'); |
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// We need to decrypt stream |
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if ($encFile->isStreamEncrypted($stream)) { |
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$success = $encFile->decryptStream($stream, $output); |
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if (!$success) { |
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throw new Exception("Failed to decrypt stream"); |
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} |
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// Rewind first |
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rewind($output); |
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fpassthru($output); |
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} |
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} else { |
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fpassthru($stream); |
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} |
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} |
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/** |
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* Files are not encrypted automatically |
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* Calls this method to encrypt them |
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* |
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* @throws Exception |
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* @return void |
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*/ |
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public function encryptFileIfNeeded() |
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{ |
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$encFile = $this->getEncryptedFileInstance(); |
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if (!$this->owner->exists()) { |
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throw new Exception("File does not exist"); |
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} |
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$stream = $this->owner->getStream(); |
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if (!$stream) { |
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throw new Exception("Failed to get stream"); |
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} |
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if (!$encFile->isStreamEncrypted($stream)) { |
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// php://temp is not a file path, it's a pseudo protocol that always creates a new random temp file when used. |
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$output = fopen('php://temp', 'wb'); |
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$success = $encFile->encryptStream($stream, $output); |
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if (!$success) { |
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throw new Exception("Failed to encrypt stream"); |
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} |
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// dont forget to rewind the stream ! |
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rewind($output); |
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// Keep the hash ! encrypting file will change it's content and it would update the hash |
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// This would move the file on the filesystem and mess up FileHash link |
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$fileResult = $this->owner->setFromStream($output, $this->owner->getFilename(), $this->owner->FileHash); |
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// Mark as encrypted in db |
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$this->owner->Encrypted = true; |
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$this->owner->write(); |
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} elseif ($this->owner->Encrypted) { |
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// Stream is not encrypted |
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if ($this->owner->Encrypted) { |
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$this->owner->Encrypted = false; |
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$this->owner->write(); |
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} |
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} |
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} |
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} |
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lekoala /
silverstripe-encrypt
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