fkooman\RemoteStorage\RemoteStorageService::putDocument PHP Method

    public function putDocument(Request $request, TokenInfo $tokenInfo)
    {
        $path = new Path($request->getUrl()->getPathInfo());
        if ($path->getUserId() !== $tokenInfo->getUserId()) {
            throw new ForbiddenException('path does not match authorized subject');
        }
        if (!$this->hasWriteScope($tokenInfo->getScope(), $path->getModuleName())) {
            throw new ForbiddenException('path does not match authorized scope');
        }
        $ifMatch = $this->stripQuotes($request->getHeader('If-Match'));
        $ifNoneMatch = $this->stripQuotes($request->getHeader('If-None-Match'));
        $documentVersion = $this->remoteStorage->getVersion($path);
        if (null !== $ifMatch && !in_array($documentVersion, $ifMatch)) {
            throw new PreconditionFailedException('version mismatch');
        }
        if (null !== $ifNoneMatch && in_array('*', $ifNoneMatch) && null !== $documentVersion) {
            throw new PreconditionFailedException('document already exists');
        }
        $x = $this->remoteStorage->putDocument($path, $request->getHeader('Content-Type'), $request->getBody(), $ifMatch, $ifNoneMatch);
        // we have to get the version again after the PUT
        $documentVersion = $this->remoteStorage->getVersion($path);
        $rsr = new Response();
        $rsr->setHeader('ETag', '"' . $documentVersion . '"');
        $rsr->setBody($x);
        return $rsr;
    }