/**
* @param RequestInterface|EntityEnclosingRequestInterface $request
* @param Credentials $credentials
*/
public function signRequest($request, $credentials)
{
$request->setHeader('X-HMB-Signature-Method', self::DEFAULT_METHOD);
$request->setHeader('X-HMB-Signature-Version', self::DEFAULT_SIGN_VERSION);
$request->setHeader('X-HMB-TimeStamp', time());
$contentMd5 = $request instanceof EntityEnclosingRequestInterface ? md5($request->getBody()) : '';
if ($contentMd5) {
$request->setHeader('Content-MD5', $contentMd5);
}
$sign = array();
$sign[] = strtoupper($request->getMethod());
$sign[] = $request->getHost();
if ($request->getHeader('Content-MD5')) {
$sign[] = $request->getHeader('Content-MD5');
}
if ($request->getHeader('Content-Type')) {
$sign[] = $request->getHeader('Content-Type');
}
$sign[] = $request->getHeader('X-HMB-Signature-Method');
$sign[] = $request->getHeader('X-HMB-Signature-Version');
$sign[] = $request->getHeader('X-HMB-TimeStamp');
if ($request->getHeader('X-HMB-User-Session-Token')) {
$sign[] = $request->getHeader('X-HMB-User-Session-Token');
}
$sign[] = $request->getQuery(true) ? $request->getPath() . '?' . $request->getQuery(true) : $request->getPath();
$signature = base64_encode(hash_hmac(strtolower($request->getHeader('X-HMB-Signature-Method')), implode("\n", $sign), $credentials->getSecret()));
$request->setHeader('Authorization', sprintf('%s %s:%s', self::AUTHORIZATION_SCHME, $credentials->getKey(), $signature));
}
/**
* Helper method to extract the items from a request object for a BatchWriteItem operation
*
* @param EntityEnclosingRequestInterface $request
*
* @return array
*/
private function extractItemsFromRequestObject(EntityEnclosingRequestInterface $request)
{
$items = json_decode((string) $request->getBody(), true);
return $this->convertResultsToUnprocessedRequests($items['RequestItems'] ?: array());
}
/**
* Handles exceptions caused by the request being too large (over 1 MB). The
* response will have a status code of 413. In this case the batch should be
* split up into smaller batches and retried.
*
* @param EntityEnclosingRequestInterface $request The failed request
* @param UnprocessedWriteRequestsException $unprocessedRequests Collection of unprocessed items
*/
protected function retryLargeRequest(EntityEnclosingRequestInterface $request, UnprocessedWriteRequestsException $unprocessedRequests)
{
// Collect the items out from the request object
$items = json_decode($request->getBody(true), true);
$items = $this->convertResultsToUnprocessedRequests($items['RequestItems']);
// Divide batch into smaller batches and transfer them via recursion
// NOTE: Dividing the batch into 3 (instead of 2) batches resulted in less recursion during testing
if ($items) {
$newBatches = array_chunk($items, ceil(count($items) / 3));
foreach ($newBatches as $newBatch) {
$this->performTransfer($newBatch, $unprocessedRequests);
}
}
}