tests: add tests for abstain in oauth whitelist

internal/service/access_controls_rules.go

@@ -1,6 +1,7 @@
 package service
 
 import (
+	"errors"
 	"regexp"
 	"strings"
 
@@ -43,8 +44,7 @@ func (rule *UserAllowedRule) Evaluate(ctx *ACLContext) Effect {
 		rule.Log.App.Debug().Msg("User is an OAuth user, checking OAuth whitelist")
 		match, err := utils.CheckFilter(ctx.ACLs.OAuth.Whitelist, ctx.UserContext.OAuth.Email)
 		if err != nil {
-			// Empty whitelist means "not configured" — let OAuth group rules decide.
-			if err == utils.ErrFilterEmpty {
+			if errors.Is(err, utils.ErrFilterEmpty) {
 				rule.Log.App.Debug().Msg("OAuth whitelist is empty, abstaining")
 				return EffectAbstain
 			}
@@ -77,7 +77,7 @@ func (rule *UserAllowedRule) Evaluate(ctx *ACLContext) Effect {
 	match, err := utils.CheckFilter(ctx.ACLs.Users.Allow, ctx.UserContext.GetUsername())
 
 	if err != nil {
-		if err == utils.ErrFilterEmpty {
+		if errors.Is(err, utils.ErrFilterEmpty) {
 			return EffectAbstain
 		}
 		rule.Log.App.Warn().Err(err).Str("item", ctx.UserContext.GetUsername()).Msg("Invalid entry in users allow list")

internal/service/access_controls_rules_test.go

@@ -44,6 +44,21 @@ func TestUserAllowedRule(t *testing.T) {
 			},
 			expected: EffectAbstain,
 		},
+		{
+			name: "abstains when filter is empty",
+			ctx: &ACLContext{
+				ACLs: &model.App{
+					OAuth: model.AppOAuth{Whitelist: ""},
+				},
+				UserContext: &model.UserContext{
+					Provider: model.ProviderOAuth,
+					OAuth: &model.OAuthContext{
+						BaseContext: model.BaseContext{Username: "alice"},
+					},
+				},
+			},
+			expected: EffectAbstain,
+		},
 		{
 			name: "allows OAuth user when email matches whitelist",
 			ctx: &ACLContext{