* Add refresh token header/cookie
As part of work on automatic refreshing of access tokens in the grafana plugin
(FB-1377), we will now accept a refresh token in the "X-Molecula-Refresh-Token"
header or the "refresh-molecula-chip" cookie.
This refresh token will be used if the access token is expired. To achieve this,
there was a lot of plumbing that had to be done. Here is a list of some of it:
* Added lots of constants for the new values.
* Removed token cache, since we will be keeping state on the clients.
* We now only refresh tokens when they are expired, which is more inline with the
OAuth spec.
* Refactored SetGRPCMetadata to be simpler to read.
* Refactored AddAuthToken.
* Update failing tests.
* We now don't split GRPC cookies on ";". Not sure why we did that before tbh.
I also added TODOs to add the refresh token to other subcommands. This is out of
scope for my current ticket, but it would be nice to have in the future.
* remove unnecessary context from Authenticate
* Add comments on why we check both cases for headers
It's because some GRPC clients lowercase metadata names. I've run into issues with
this enough that I think it's worth the extra checks. We prefer lowercase though,
because that's "standard".
* Fix test that broke during rebase
* Use IP whitelisting for ingest
For ingest, use configured IPs to authenticate the requests.
Auth-token will no longer be used for requests from ingest consumers.
If IP in request is in configured IPs, authenticate and authorize as an admin.
If IP in request is not in configured IPs, proceed with the standard authentication/authorization using ADD.
* need to remove port from client IP
* addressed review comments
* make CookieName an exported constant
* fix SetGRPCMetadata
this will actually set the grpc metadata even if there are no cookies in the
metadata already.
* gofmt yourself
- rip out gobby stuff
- add tokenCache, groupsCache
- refresh the token if needed
- set cookies after authenticate
- remove signature validation, the IDP does that for us
- added way more unit tests
- update older tests to use new API
- add fake idp to authcluster tests
