/**
* @medium
* test if stream wrapper can read files outside from the data folder
*/
function testStreamFromLocalFile()
{
$filename = '/' . $this->userId . '/files/' . 'tmp-' . uniqid() . '.txt';
$tmpFilename = "/tmp/" . uniqid() . ".txt";
// write an encrypted file
$cryptedFile = $this->view->file_put_contents($filename, $this->dataShort);
// Test that data was successfully written
$this->assertTrue(is_int($cryptedFile));
// create a copy outside of the data folder in /tmp
$proxyStatus = \OC_FileProxy::$enabled;
\OC_FileProxy::$enabled = false;
$encryptedContent = $this->view->file_get_contents($filename);
\OC_FileProxy::$enabled = $proxyStatus;
file_put_contents($tmpFilename, $encryptedContent);
\OCA\Encryption\Helper::addTmpFileToMapper($tmpFilename, $filename);
// try to read the file from /tmp
$handle = fopen("crypt://" . $tmpFilename, "r");
$contentFromTmpFile = stream_get_contents($handle);
// check if it was successful
$this->assertEquals($this->dataShort, $contentFromTmpFile);
// clean up
unlink($tmpFilename);
$this->view->unlink($filename);
}
/**
* get the file size of the unencrypted file
* @param string $path absolute path
* @return bool
*/
public function getFileSize($path)
{
$result = 0;
// Disable encryption proxy to prevent recursive calls
$proxyStatus = \OC_FileProxy::$enabled;
\OC_FileProxy::$enabled = false;
// split the path parts
$pathParts = explode('/', $path);
if (isset($pathParts[2]) && $pathParts[2] === 'files' && $this->view->file_exists($path) && $this->isEncryptedPath($path)) {
$offset = 0;
if ($this->containHeader($path)) {
$offset = Crypt::BLOCKSIZE;
}
// get the size from filesystem if the file contains a encryption header we
// we substract it
$size = $this->view->filesize($path) - $offset;
// fast path, else the calculation for $lastChunkNr is bogus
if ($size === 0) {
\OC_FileProxy::$enabled = $proxyStatus;
return 0;
}
// calculate last chunk nr
// next highest is end of chunks, one subtracted is last one
// we have to read the last chunk, we can't just calculate it (because of padding etc)
$lastChunkNr = ceil($size / Crypt::BLOCKSIZE) - 1;
$lastChunkSize = $size - $lastChunkNr * Crypt::BLOCKSIZE;
// open stream
$stream = fopen('crypt://' . $path, "r");
if (is_resource($stream)) {
// calculate last chunk position
$lastChunckPos = $lastChunkNr * Crypt::BLOCKSIZE;
// seek to end
if (@fseek($stream, $lastChunckPos) === -1) {
// storage doesn't support fseek, we need a local copy
fclose($stream);
$localFile = $this->view->getLocalFile($path);
Helper::addTmpFileToMapper($localFile, $path);
$stream = fopen('crypt://' . $localFile, "r");
if (fseek($stream, $lastChunckPos) === -1) {
// if fseek also fails on the local storage, than
// there is nothing we can do
fclose($stream);
\OCP\Util::writeLog('Encryption library', 'couldn\'t determine size of "' . $path, \OCP\Util::ERROR);
return $result;
}
}
// get the content of the last chunk
$lastChunkContent = fread($stream, $lastChunkSize);
// calc the real file size with the size of the last chunk
$realSize = $lastChunkNr * 6126 + strlen($lastChunkContent);
// store file size
$result = $realSize;
}
}
\OC_FileProxy::$enabled = $proxyStatus;
return $result;
}
