oid_introspection: add SetOIDCClaims

This method allows third-party filters to set the oidcClaimsCacheKey
which enables the use of the oidcClaimsQuery filter.

Signed-off-by: Adrien Surée <adrien.suree@zalando.de>

filters/auth/oidc.go

@@ -843,7 +843,8 @@ func (f *tokenOidcFilter) Request(ctx filters.FilterContext) {
 	}
 
 	// saving token info for chained filter
-	ctx.StateBag()[oidcClaimsCacheKey] = container
+	// ctx.StateBag()[oidcClaimsCacheKey] = container
+	SetOIDCClaims(ctx, container.Claims)
 
 	// adding upstream headers
 	err = setHeaders(f.upstreamHeaders, ctx, container)

filters/auth/oidc_introspection.go

@@ -42,6 +42,14 @@ func NewOIDCQueryClaimsFilter() filters.Spec {
 	}
 }
 
+// Sets OIDC claims in the state bag.
+// Intended for use with the oidcClaimsQuery filter.
+func SetOIDCClaims(ctx filters.FilterContext, claims map[string]interface{}) {
+	ctx.StateBag()[oidcClaimsCacheKey] = tokenContainer{
+		Claims: claims,
+	}
+}
+
 func (spec *oidcIntrospectionSpec) Name() string {
 	switch spec.typ {
 	case checkOIDCQueryClaims: