A search with SimilarImage raises an exception

[joaquin-freepik]

Issue report

Brief description of issue

Try to search with SimilarImage using code like:

    $search_params = new SearchParameters();
    $search_params->setSimilarImage(true);

    $request = new SearchFilesRequest();
    $request->setLocale('en-US');
    $request->setSearchParams($search_params);
    $request->setSimilarImage("myimage.jpg");

    $response = $client->searchFilesInitialize($request, $accessToken)->getNextResponse();

You will get a StockApi exception with the error message "Image File is not readable".

The exception is raised in HttpClient.php:92, where it checks if $file is a readable file. However, $file contains the binary content of the image file, not the image name. Just below this code, $file is used as the contents of a multipart upload (assuming it contains the content of the image). My guess is the if (!is_readable($file)) { ... } block is not needed and is introducing this bug.

Proposed fix (if applicable)

Remove the if (!is_readable($file)) { ... }