Box uses POST multipart/form requests for uploading. Such requests could
be sent with libcurl if we either have a file available or a buffer with
this file's contents.
SavesSyncRequest was using Storage::upload(ReadStream *), which couldn't
be implemented in BoxStorage. Thus I've added a method to test whether
such upload is supported and, if it's not, SavesSyncRequest uses the
other.
This is a special base class for Storages which are using ids instead of
paths in their APIs, like Box or Google Drive.
This commit makes Box derived from IdStorage.
And used in it BoxResolveIdRequest.
TODO: make some generic ResolveIdRequest and ListDirectoryRequest for
id-based storages. It's really similar, I just had to change a few
details in GoogleDrive ListDirectory and ResolveId requests.
D G Turner
Eugene Sandulenko
Peter Bozsó
Alexander Tkachev