[Go][Hydra] client library error when decoding GetLoginRequest response that contains oidc context

[jagobagascon]

Preflight checklist

• I could not find a solution in the existing issues, docs, nor discussions.
• I agree to follow this project's Code of Conduct.
• I have read and am following this repository's Contribution Guidelines.
• This issue affects my Ory Network project.
• I have joined the Ory Community Slack.
• I am signed up to the Ory Security Patch Newsletter.

Describe the bug

Some of our requests to the /admin/oauth2/auth/requests/login endpoint are returning an unmarshal error after upgrading to 1.11.8.

After some debugging I found out that it fails every time Hydra returns a non-empty oidc_context. id_token_hint_claims field. According to the spec this field should be an object that contains any kind of field. But the model is defined as follows:

sdk/clients/hydra/go/model_open_id_connect_context.go

Line 25 in 5bc3139

IdTokenHintClaims map[string]map[string]interface{} `json:"id_token_hint_claims,omitempty"`

Reproducing the bug

Since this is a serialization issue I would say there are lots of ways of reproducing this.

We are using the PKCE flow in several apps. And we wanted to mimic the prompt=select_account behaviour. For that we are using the prompt=login parameter to send users to the login screen (ory/hydra#1943). This allows our users to easily switch accounts, but this also makes the oidc_context.id_token_hint_claims to be filled.

1. Log in with a user: goes back to app with a valid token. ✅
2. Log in with another user: goes back to app with a valid token. ✅
3. Refresh the screen: this error happens. ❌

Relevant log output

json: cannot unmarshal string into Go struct field OpenIDConnectContext.oidc_context.id_token_hint_claims of type map[string]interface {}

Relevant configuration

No response

Version

1.11.8

On which operating system are you observing this issue?

macOS

In which environment are you deploying?

Docker

Additional Context

No response