openEO client config file

[soxofaan]

openeo python client already supports using a config file for authentication related settings, but there is more opportunity for config file based configuration. E.g.

• config: default backend #187
• Pass basemap details (url, attribution) to Vue components via env vars? #260
• default timeouts, retry settings, ...
• temp folders (e.g. for partial downloads)
• ...

While the auth config file is very user specific, these general configs are not privacy/security sensitive.
So we could support a layered approach with a system wide config (e.g. /etc/openeo.conf), a user specific config (e.g. /home/john/.openeo.conf), a project specific config (e.g. path/to/myproject/openeo.conf), env variables, ...

If possible, we could even have a common config approach with the R and JS client.

[m-mohr]

Interesting idea. This could get a bit complicated once it's not just Linux (e.g. user workspace mess on Windows).

The JS client would only be able to read such files in Node and in Node there's no OIDC auth available as of now, but I haven't seen anyone use the JS client in a Node environment. So pretty low priority there, but I could see this as being an interesting option for R, indeed. Will open a respective issue there, too.

[soxofaan]

Another config idea (inspired by https://github.com/openEOPlatform/architecture-docs/issues/116):

• opt-in to show a warning if there is newer client version available.

[soxofaan]

another one:

• Add config option to automatically authenticate as desired when using openeo.connect #196

[soxofaan]

merge of #289 introduces basic config system

[soxofaan]

another use case in this realm:

• support client credentials grant from Connection.authenticate_oidc() #419