Support multiple policy

Hi, I am new in casbin and I am combining RBAC & ABAC model following https://casbin.org/docs/en/syntax-for-models#multiple-sections-type, but It seems that jcasbin has no implemented yet (I am using latest version v1.19.0). So I got the exception when running the test as below:

java.lang.NullPointerException
	at org.casbin.jcasbin.rbac.DefaultRoleManager.hasLink(DefaultRoleManager.java:197)
	at org.casbin.jcasbin.util.BuiltInFunctions$1.variadicCall(BuiltInFunctions.java:395)
	at com.googlecode.aviator.runtime.function.AbstractVariadicFunction.call(AbstractVariadicFunction.java:71)
	at Script_1638266462922_58.execute0(Script_1638266462922_58:1)
	at com.googlecode.aviator.ClassExpression.executeDirectly(ClassExpression.java:44)
	at com.googlecode.aviator.BaseExpression.execute(BaseExpression.java:237)
	at org.casbin.jcasbin.main.CoreEnforcer.enforce(CoreEnforcer.java:463)
	at org.casbin.jcasbin.main.CoreEnforcer.enforce(CoreEnforcer.java:575)

My test:

    @Test
    public void testRBACMixingABACModel() throws Exception {
        var objectMapper = new ObjectMapper();
        Adapter adapter =  new FileAdapter("src/test/resources/rbac_abac_mixing_policy.csv");
        Model model = new Model();
        model.loadModelFromText(FileUtil.readResource("/rbac_abac_mixing_model.conf"));
        Enforcer e = new Enforcer(model, adapter);
        EnforceContext enforceContext = new EnforceContext("p2", "e2", "m2", "r2");
        TestEvalRule alice = new TestEvalRule("alice", 18);
        assertEquals(false, e.enforce(enforceContext, alice, "/data1", "read"));
   }

My model:

[request_definition]
r = sub, obj, act
r2 = sub, obj, act

[policy_definition]
p = sub, obj, act
p2= sub_rule, obj, act

[role_definition]
g = _, _

[policy_effect]
e = some(where (p.eft == allow))

[matchers]
#RABC
m = g(r.sub, p.sub) && r.obj == p.obj && r.act == p.act
#ABAC
m2 = eval(p2.sub_rule) && r2.obj == p2.obj && r2.act == p2.act

My policies:

p2, r2.sub.age > 18 && r2.sub.age < 25, /data1, read
p, admin, /data2, write

g, alice, admin

My TestEvalRule class & EnforceContext class

    public static class TestEvalRule implements Serializable {
        private String name;
        private int age;

        TestEvalRule(String name, int age) {
            this.name = name;
            this.age = age;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public int getAge() {
            return age;
        }

        public void setAge(int age) {
            this.age = age;
        }
    }

    public static class EnforceContext {
        private String pType;
        private String eType;
        private String mType;
        private String rType;

        public EnforceContext(String pType, String eType, String mType, String rType) {
            this.pType = pType;
            this.eType = eType;
            this.mType = mType;
            this.rType = rType;
        }

        public String getpType() {
            return pType;
        }

        public void setpType(String pType) {
            this.pType = pType;
        }

        public String geteType() {
            return eType;
        }

        public void seteType(String eType) {
            this.eType = eType;
        }

        public String getmType() {
            return mType;
        }

        public void setmType(String mType) {
            this.mType = mType;
        }

        public String getrType() {
            return rType;
        }

        public void setrType(String rType) {
            this.rType = rType;
        }
    }

Please help to correct me if I am missing something. Thanks and best regards,

Huy

[seriouszyx]

@huyphan-tiki @hungpham1309 Have supported it in #242, plz review. And in your example, the unit test should be changed as below (Use EnforceContext provided by jCasbin and set eType as “e”).

@Test
public void testRBACMixingABACModel() throws Exception {
    Enforcer e = new Enforcer("examples/rbac_abac_mixing_model.conf", "examples/rbac_abac_mixing_policy.csv");
    EnforceContext enforceContext = new EnforceContext("2");
    enforceContext.seteType("e");
    AbacAPIUnitTest.TestEvalRule alice = new AbacAPIUnitTest.TestEvalRule("alice", 18);
    assertEquals(false, e.enforce(enforceContext, alice, "/data1", "read"));
}

[huyphan-tiki]

Thanks @hsluoyz , @seriouszyx a lot!