feat: update end session request to pass all params according to specification (#754)

* feat: update end session request to pass all params according to specification

* register encoder

pkg/oidc/session.go

@@ -4,7 +4,9 @@ package oidc
 // https://openid.net/specs/openid-connect-rpinitiated-1_0.html#RPLogout
 type EndSessionRequest struct {
 	IdTokenHint           string  `schema:"id_token_hint"`
+	LogoutHint            string  `schema:"logout_hint"`
 	ClientID              string  `schema:"client_id"`
 	PostLogoutRedirectURI string  `schema:"post_logout_redirect_uri"`
 	State                 string  `schema:"state"`
+	UILocales             Locales `schema:"ui_locales"`
 }

pkg/oidc/types.go

@@ -115,6 +115,14 @@ func ParseLocales(locales []string) Locales {
 	return out
 }
 
+func (l Locales) String() string {
+	tags := make([]string, len(l))
+	for i, tag := range l {
+		tags[i] = tag.String()
+	}
+	return strings.Join(tags, " ")
+}
+
 // UnmarshalText implements the [encoding.TextUnmarshaler] interface.
 // It decodes an unquoted space seperated string into Locales.
 // Undefined language tags in the input are ignored and ommited from
@@ -231,6 +239,9 @@ func NewEncoder() *schema.Encoder {
 	e.RegisterEncoder(SpaceDelimitedArray{}, func(value reflect.Value) string {
 		return value.Interface().(SpaceDelimitedArray).String()
 	})
+	e.RegisterEncoder(Locales{}, func(value reflect.Value) string {
+		return value.Interface().(Locales).String()
+	})
 	return e
 }
 

pkg/op/session.go

@@ -73,6 +73,8 @@ func ValidateEndSessionRequest(ctx context.Context, req *oidc.EndSessionRequest,
 
 	session := &EndSessionRequest{
 		RedirectURI: ender.DefaultLogoutRedirectURI(),
+		LogoutHint:  req.LogoutHint,
+		UILocales:   req.UILocales,
 	}
 	if req.IdTokenHint != "" {
 		claims, err := VerifyIDTokenHint[*oidc.IDTokenClaims](ctx, req.IdTokenHint, ender.IDTokenHintVerifier(ctx))

pkg/op/storage.go

@@ -6,6 +6,7 @@ import (
 	"time"
 
 	jose "github.com/go-jose/go-jose/v4"
+	"golang.org/x/text/language"
 
 	"github.com/zitadel/oidc/v3/pkg/oidc"
 )
@@ -170,6 +171,8 @@ type EndSessionRequest struct {
 	ClientID          string
 	IDTokenHintClaims *oidc.IDTokenClaims
 	RedirectURI       string
+	LogoutHint        string
+	UILocales         []language.Tag
 }
 
 var ErrDuplicateUserCode = errors.New("user code already exists")