snapshot of https://github.com/casbin/casbin.git (master, 2026-09-15; blobs > 131072B omitted)

constraint_test.go

@@ -0,0 +1,336 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package casbin
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/casbin/casbin/v3/errors"
+	"github.com/casbin/casbin/v3/model"
+)
+
+func TestConstraintSOD(t *testing.T) {
+	modelText := `
+[request_definition]
+r = sub, obj, act
+
+[policy_definition]
+p = sub, obj, act
+
+[role_definition]
+g = _, _
+
+[constraint_definition]
+c = sod("role1", "role2")
+
+[policy_effect]
+e = some(where (p.eft == allow))
+
+[matchers]
+m = g(r.sub, p.sub) && r.obj == p.obj && r.act == p.act
+`
+
+	m, err := model.NewModelFromString(modelText)
+	if err != nil {
+		t.Fatalf("Failed to create model: %v", err)
+	}
+
+	e, err := NewEnforcer(m)
+	if err != nil {
+		t.Fatalf("Failed to create enforcer: %v", err)
+	}
+
+	// Add a user to role1 should succeed
+	_, err = e.AddRoleForUser("alice", "role1")
+	if err != nil {
+		t.Fatalf("Failed to add role1 to alice: %v", err)
+	}
+
+	// Add a different user to role2 should succeed
+	_, err = e.AddRoleForUser("bob", "role2")
+	if err != nil {
+		t.Fatalf("Failed to add role2 to bob: %v", err)
+	}
+
+	// Try to add role2 to alice should fail (SOD violation)
+	_, err = e.AddRoleForUser("alice", "role2")
+	if err == nil {
+		t.Fatal("Expected constraint violation error, got nil")
+	}
+	if !strings.Contains(err.Error(), "constraint violation") {
+		t.Fatalf("Expected constraint violation error, got: %v", err)
+	}
+}
+
+func TestConstraintSODMax(t *testing.T) {
+	modelText := `
+[request_definition]
+r = sub, obj, act
+
+[policy_definition]
+p = sub, obj, act
+
+[role_definition]
+g = _, _
+
+[constraint_definition]
+c = sodMax(["role1", "role2", "role3"], 1)
+
+[policy_effect]
+e = some(where (p.eft == allow))
+
+[matchers]
+m = g(r.sub, p.sub) && r.obj == p.obj && r.act == p.act
+`
+
+	m, err := model.NewModelFromString(modelText)
+	if err != nil {
+		t.Fatalf("Failed to create model: %v", err)
+	}
+
+	e, err := NewEnforcer(m)
+	if err != nil {
+		t.Fatalf("Failed to create enforcer: %v", err)
+	}
+
+	// Add user to one role should succeed
+	_, err = e.AddRoleForUser("alice", "role1")
+	if err != nil {
+		t.Fatalf("Failed to add role1 to alice: %v", err)
+	}
+
+	// Try to add user to another role from the set should fail
+	_, err = e.AddRoleForUser("alice", "role2")
+	if err == nil {
+		t.Fatal("Expected constraint violation error, got nil")
+	}
+	if !strings.Contains(err.Error(), "constraint violation") {
+		t.Fatalf("Expected constraint violation error, got: %v", err)
+	}
+}
+
+func TestConstraintRoleMax(t *testing.T) {
+	modelText := `
+[request_definition]
+r = sub, obj, act
+
+[policy_definition]
+p = sub, obj, act
+
+[role_definition]
+g = _, _
+
+[constraint_definition]
+c = roleMax("admin", 2)
+
+[policy_effect]
+e = some(where (p.eft == allow))
+
+[matchers]
+m = g(r.sub, p.sub) && r.obj == p.obj && r.act == p.act
+`
+
+	m, err := model.NewModelFromString(modelText)
+	if err != nil {
+		t.Fatalf("Failed to create model: %v", err)
+	}
+
+	e, err := NewEnforcer(m)
+	if err != nil {
+		t.Fatalf("Failed to create enforcer: %v", err)
+	}
+
+	// Add first user to admin role should succeed
+	_, err = e.AddRoleForUser("alice", "admin")
+	if err != nil {
+		t.Fatalf("Failed to add admin to alice: %v", err)
+	}
+
+	// Add second user to admin role should succeed
+	_, err = e.AddRoleForUser("bob", "admin")
+	if err != nil {
+		t.Fatalf("Failed to add admin to bob: %v", err)
+	}
+
+	// Try to add third user to admin role should fail (exceeds max)
+	_, err = e.AddRoleForUser("charlie", "admin")
+	if err == nil {
+		t.Fatal("Expected constraint violation error, got nil")
+	}
+	if !strings.Contains(err.Error(), "constraint violation") {
+		t.Fatalf("Expected constraint violation error, got: %v", err)
+	}
+}
+
+func TestConstraintRolePre(t *testing.T) {
+	modelText := `
+[request_definition]
+r = sub, obj, act
+
+[policy_definition]
+p = sub, obj, act
+
+[role_definition]
+g = _, _
+
+[constraint_definition]
+c = rolePre("db_admin", "security_trained")
+
+[policy_effect]
+e = some(where (p.eft == allow))
+
+[matchers]
+m = g(r.sub, p.sub) && r.obj == p.obj && r.act == p.act
+`
+
+	m, err := model.NewModelFromString(modelText)
+	if err != nil {
+		t.Fatalf("Failed to create model: %v", err)
+	}
+
+	e, err := NewEnforcer(m)
+	if err != nil {
+		t.Fatalf("Failed to create enforcer: %v", err)
+	}
+
+	// Try to add db_admin without prerequisite should fail
+	_, err = e.AddRoleForUser("alice", "db_admin")
+	if err == nil {
+		t.Fatal("Expected constraint violation error, got nil")
+	}
+	if !strings.Contains(err.Error(), "constraint violation") {
+		t.Fatalf("Expected constraint violation error, got: %v", err)
+	}
+
+	// Add prerequisite role first
+	_, err = e.AddRoleForUser("alice", "security_trained")
+	if err != nil {
+		t.Fatalf("Failed to add security_trained to alice: %v", err)
+	}
+
+	// Now adding db_admin should succeed
+	_, err = e.AddRoleForUser("alice", "db_admin")
+	if err != nil {
+		t.Fatalf("Failed to add db_admin to alice: %v", err)
+	}
+}
+
+func TestConstraintWithoutRBAC(t *testing.T) {
+	modelText := `
+[request_definition]
+r = sub, obj, act
+
+[policy_definition]
+p = sub, obj, act
+
+[constraint_definition]
+c = sod("role1", "role2")
+
+[policy_effect]
+e = some(where (p.eft == allow))
+
+[matchers]
+m = r.sub == p.sub && r.obj == p.obj && r.act == p.act
+`
+
+	_, err := model.NewModelFromString(modelText)
+	if err == nil {
+		t.Fatal("Expected error for constraints without RBAC, got nil")
+	}
+	if err != errors.ErrConstraintRequiresRBAC {
+		t.Fatalf("Expected ErrConstraintRequiresRBAC, got: %v", err)
+	}
+}
+
+func TestConstraintParsingError(t *testing.T) {
+	modelText := `
+[request_definition]
+r = sub, obj, act
+
+[policy_definition]
+p = sub, obj, act
+
+[role_definition]
+g = _, _
+
+[constraint_definition]
+c = invalidFunction("role1", "role2")
+
+[policy_effect]
+e = some(where (p.eft == allow))
+
+[matchers]
+m = g(r.sub, p.sub) && r.obj == p.obj && r.act == p.act
+`
+
+	_, err := model.NewModelFromString(modelText)
+	if err == nil {
+		t.Fatal("Expected parsing error for invalid constraint, got nil")
+	}
+	if !strings.Contains(err.Error(), "constraint parsing error") {
+		t.Fatalf("Expected constraint parsing error, got: %v", err)
+	}
+}
+
+func TestConstraintRollback(t *testing.T) {
+	modelText := `
+[request_definition]
+r = sub, obj, act
+
+[policy_definition]
+p = sub, obj, act
+
+[role_definition]
+g = _, _
+
+[constraint_definition]
+c = sod("role1", "role2")
+
+[policy_effect]
+e = some(where (p.eft == allow))
+
+[matchers]
+m = g(r.sub, p.sub) && r.obj == p.obj && r.act == p.act
+`
+
+	m, err := model.NewModelFromString(modelText)
+	if err != nil {
+		t.Fatalf("Failed to create model: %v", err)
+	}
+
+	e, err := NewEnforcer(m)
+	if err != nil {
+		t.Fatalf("Failed to create enforcer: %v", err)
+	}
+
+	// Add alice to role1
+	_, err = e.AddRoleForUser("alice", "role1")
+	if err != nil {
+		t.Fatalf("Failed to add role1 to alice: %v", err)
+	}
+
+	// Try to add alice to role2 (should fail with constraint violation)
+	_, err = e.AddRoleForUser("alice", "role2")
+	if err == nil {
+		t.Fatal("Expected constraint violation error, got nil")
+	}
+	if !strings.Contains(err.Error(), "constraint violation") {
+		t.Fatalf("Expected constraint violation error, got: %v", err)
+	}
+}