a kind of online equivalent of swh identify.

Such a service should allow a user to:

• upload a file,
• upload a directory (probably as a zip-like),
• upload a (supported) package file (python source package, cran, etc.)
• (can we/how to handle a non-git revision?)

and get a clear answer showing:

• the SWHID of the submitted content (with possibility to navigate, when it's a directory )
• whether it is known by SWH or not

Note that we currently have a simple version of this service on the main web page, but only for files. The proposed service should be able to replace this, and possible available as a public API, or maybe a pure js implementation so the computation is made client side.