feat: openid-connect plugin: Support extra session config options, remove unused option

[arthurdarcet]

Description

In the openid-connect plugin:

• Remove the session.cookie.lifetime option: that option doesn't exist in the lua-resty-session lib, and has no impact
• allow extra properties to support all the possible config options supported by the underlying lib

Needed because we need to change the cookie domain to set it to the base tld, and not the subdomain of the initial request, so that different product can share auth status.

Without that cookie_domain option, each subdomain needs to trigger an auth flow which are extra un-needed redirections for the user, and more importantly, if one subdomain is set to "unauth_action = pass", the user will be logged out on that domain until they explicitly log in even if they are actually already logged in on other subdomains.

Change is backward compatible because the allowed extra props allow the removed option to be still present.

Fixes
#12050
#12028

Checklist

• [*] I have explained the need for this PR and the problem it solves
• [*] I have explained the changes or the new features added to this PR
• I have added tests corresponding to this change
• [*] I have updated the documentation to reflect this change
• [*] I have verified that this change is backward compatible (If not, please discuss on the APISIX mailing list first)

[arthurdarcet]

I wasn't reading the right version of the code for the resty.session lib - sorry for the noise.

cookie.lifetime is supported, and the cookie domain can be configured by setting the session.cookie.domain conf option of the openid-connect plugin (which is allowed even if not documented).

I think the session options could be improved in that plugin, but that's not a blocker for us anymore (for instance, to set a custom cookie name, i would need to set the session.name option on the plugin, but the schema doesn't allow that (even though the underlying lib supports it). I would change this to accept anything in the session key, and document it only with a link to the exact version of the resty.session lib that is bundled to be both exhaustive and exact.

[mengxzh]

@arthurdarcet
Sorry, How custom config session using redis in this plugin at version 3.10

[arthurdarcet]

@arthurdarcet Sorry, How custom config session using redis in this plugin at version 3.10

afaics, you can't. You will need to write a custom plugin that can delegate to the openid-connect plugin after setting a few global vars that the underlying resty.session plugin will pick up.

[mengxzh]

@arthurdarcet You mean i should custom plugin which is priority higher than openid-connect? And then i should set global vars that oidc-connect could read it?

[arthurdarcet]

@mengxzh this isn't really a support forum. I meant that you need to write a custom plugin to replace the existing openid-connect plugin, but can do that with very little custom code by importing the existing plugin into your new plugin

[mengxzh]

@arthurdarcet Why lift this limitaion as your code? As a custom config feature, it will be flexible.

[arthurdarcet]

@arthurdarcet Why lift this limitaion as your code? As a custom config feature, it will be flexible.

yes, feel free to open another PR to remove the additionalProps: false or to document all the possible options

[mengxzh]

@arthurdarcet Why lift this limitaion as your code? As a custom config feature, it will be flexible.

yes, feel free to open another PR to remove the additionalProps: false or to document all the possible options

Thanks for your help :)