Show version of parent & planet (connects #1671)

[paulbert]

Uses the new /version endpoint rather than the database.

[paulbert]

I'd like to merge this so we at least don't have to manually add a configuration document to be able to login, but this doesn't fully fix the issue.

It's not working to show the version in the dashboard, and the GET request is failing to the nation and returning this error:

Failed to load https://paulbert.media.mit.edu/version: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'https://localhost:3000' is therefore not allowed access. The response had HTTP status code 405.

Because the development environment won't have a local /version location, I can't debug why the local version isn't showing up in the docker container, either. In any case I just wanted to fix up the changes we made to the configuration database and then pass this off.

[paulbert]

Figured out what was going wrong: the headers were incorrect for the request. This appears to work now.

[paulbert]

After testing with the dev and paulbert nations, it looks like the changes I made were not enough and we will need to add the Access-Control-Allow-Origin header to the server.

@mappuji @dogi @lmmrssa Tagging so we can discuss at systems meeting.

[empeje]

I thought you are using file, but seems you're using the db-init to import the veersion and then call the database via angular.

how about if I update the planet, in couchdb if we re add different value to different document, it will update the record with the new one right?

[paulbert]

@mappuji We're not using the database anymore for the version number. This PR removes changes that would involve db-init or CouchDB for storing & accessing the version. Basically the DB would be easier to accidentally change, so with this we just expose a file to read externally with the version as text (see #1666 for that change). Problem is we need to read that file with cross origins.

[empeje]

Cool, LGTM 👍

[dogi]

@paulbert how would I test this?

hmm - assume if I just look at the manager view ... but not sure

[paulbert]

@dogi Yes look at the manager view to test. If you create a community on the "Paul" nation you will see both nation & community versions, if not you'll just see community.

[paulbert]

@dogi I'm going to merge this & we can test tomorrow.