Create resource tree from FTP

[Kaliumhexacyanoferrat]

As the developer of a web application, I would like to integrate resources provided by FTP, so that I can easily integrate content hosted there.

Example

var tree = ResourceTree.FromFTP(/* url, credentials */);

Host.Create()
    .Handler(Listing.From(tree))
    .Run();

var resource = Resource.FromFTP(/* url, credentials */);

Host.Create()
    .Handler(Download.From(resource))
    .Run();

Acceptance criteria

• The functionality is implemented in an additional FTP module
• The functionality uses a well tested, mature, maintained library to access FTP resources
• Files and folders are fetched on-demand and the information is not cached
• Connections are created and disposed on the fly when needed (resource tree must be thread-safe)
• The functionality does not expose internal, client-specific types (e.g. network credentials)
• The functionality uses an efficient checksum algorithm (e.g. modification date and file size)
• A connection pool may be used
• Acceptance tests have been written (either mocked or by hosting an in-memory server, if possible)