Allow sharing access to your container ports to enable live collaboration (IDE, VNC, web preview...)

[jankeromnes]

• To enable Cloud9 collaboration, add --collab to https://github.com/JanitorTechnology/dockerfiles/blob/d25a150613cb02c32a1d6ef97ba1a4beaeb3494c/ubuntu-dev/supervisord.conf#L10
• To expose it, find out how to give other Janitor users access to the collaborative IDE URL (currently, Janitor users can only access containers that they actually own)
• In the sharing UI, we should be very clear that sharing container access may allow others to view sensitive credentials like OAuth tokens and API keys (see also github/hub#1668 (comment))

[jankeromnes]

The --collab argument was added in JanitorTechnology/dockerfiles@acc5035.

Now we can try to use the IDE in collaborative mode / figure out how to make the feature easy to use.

[jankeromnes]

It could be done by allowing other users to access your container ports, and then giving them the same URL you're using, e.g. https://pianosa.janitor.technology/abcd1234/8089/

In the above example, if you don't own the container abcd1234, the Docker host's API call to https://janitor.technology/api/hosts/pianosa.janitor.technology/containers/abcd1234/3000 will result in a 404 error.

We could tweak this API handler to check an access list (which could be edited by container owners using a new API handler for sharing containers) instead of just verifying container ownership.

[nt1m]

A quick little mockup of how this feature can look like:

[jankeromnes]

Thanks a lot for this mockup! It's perfect 😄 I want this feature so bad...

Random thought: If we have a URL that can point to a specific container and a specific tab, we could potentially redirect Cloud9 IDE's "Share" button to this panel in Janitor.

Edit: Maybe something like https://jntr.io/containers/#abcdef0123456-share? Would probably require some JS though, unfortunately.

[jankeromnes]

@bnjbvr would also like a feature to "share publicly" 😄 (I'm thinking maybe port-specific, e.g. just share a web preview but not Cloud9 IDE, and with a secret URL).