luarx opened a new pull request, #13616:
URL: https://github.com/apache/apisix/pull/13616
### Description
Add a new boolean plugin option `set_enc_id_token_header` (default:
`false`) that, when
enabled, forwards the raw RS256-signed ID token JWT to upstream via the
`X-Enc-ID-Token`
request header.
Unlike the existing `X-ID-Token` header (which contains
`base64(JSON(decoded_claims))` with
no cryptographic signature), `X-Enc-ID-Token` carries the original signed
token verifiable
against the identity provider's JWKS endpoint.
Implementation details:
- The header is cleared at rewrite entry to prevent client injection.
ensures `enc_id_token` is included so the raw JWT is persisted in the
session by
lua-resty-openidc. When `session_contents` is nil (the default),
lua-resty-openidc stores all
session data including `enc_id_token`, so no action is needed.
- Only available in the full OIDC session flow (not in the
bearer/introspection path, where
no session exists).
#### Which issue(s) this PR fixes:
Fixes #13615
### Checklist
- [x] I have explained the need for this PR and the problem it solves
- [x] I have explained the changes or the new features added to this PR
- [x] I have added tests corresponding to this change
- [x] I have updated the documentation to reflect this change
- [x] I have verified that this change is backward compatible (If not,
please discuss on the
[APISIX mailing
list](https://github.com/apache/apisix/tree/master#community) first)
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