Revoke & Expire TCX URLs

[rootelement]

When you get a git URL for the user to add themselves to a repo, right now it has git information in there (ids and such). This should be replaced with a TCX obfuscated URL that is validated before the user.

Suggestion:
https://x.topcoder.com/<project-slug>/<10 char alpha key>

When setting up this URL, you should be able to have it not expire, or set an expiry in days, defaulting to 60 days. When a user clicks a link that has expired, it should show them a page that tells them so.

You should be able to generate multiple URLs per project with different expirys on it, which could also be provided to different places.

You should be able to "delete" (soft delete) a URL from a project so it can't be used anymore. This should work no matter if the original URL had an expiration or not.

[cwdcwd]

that's not a git id. that's a guid

[rootelement]

SO SHOOT ME!

No, that's even better. I think we should clean up the TCX url and shorten it, but if we have GUIDs, expiration and revoke should be easy to set up.

[jmgasper]

Moving this to the topcoder-x-ui repo, where I track changes.