Cloud drive download proof of concept (Java7, Rest, Oauth2, Dropbox/google drive/skydrive))

Required skills: Java 7, Oauth 2.0 security, Consuming Rest web services, Writing understandable code of high quality: Short, simple, concise and well-documented proof-of-concept example of how to download all (arbitrary sized) files in "folder X" using Java 7, Jersey 2 client, the raw REST WEB API and OAUTH 2 over SSL (WITH no vendor specific SDKs) from: 1) DropBox 2) Google Drive 3) Microsoft skydrive All of these cloud drive solutions has SDKs but they are not to be used because I want to avoid unnecessary dependencies. All of the above solutions should be accessible using standard HTTP REST with OAUTH 2 as noted by the links below. Note that DropBox also have OAUTH1 support but that will be phased out so it can't be used. [login to view URL] [login to view URL] [login to view URL] Allowed dependencies: Java7, Jersey 2.0 rest client Apache http client 4.2.* (only if needed ?), Scribe-java for OAUTH2 (only if needed ? - or perhaps a single other library - ask if you have a suggestion) Maven and/or eclipse I am a developer myself and I need the code as a starting point. So I need something I can build on not a finished product. Work will be rejected if more dependencies are introduced then the above unless you have an compelling argument that I accept in advance. Work will also be rejected if the proof of concept fails to work with large/huge files or don't download all files including nested folder files. Finally, work will be rejected if the code is spaghetti style, fragile, undocumented or can't build without errors. Bonus or additional work likely for very well written code that f.x. reuse common parts between the 3 cloud drive solutions.