fix: add enforce command (#15)

Author: liewstar

README.md

@@ -33,13 +33,13 @@ mvn clean install
 - Check whether Alice has read permission on data1
 
     ```shell
-    ./casbin -m "examples/rbac_model.conf" -p "examples/rbac_policy.csv" -e "alice, data1, read"
+    ./casbin enforce -m "examples/rbac_model.conf" -p "examples/rbac_policy.csv" "alice" "data1" "read"
     ```
-    > Allow
+    > Allowed
     ```shell
-    ./casbin -m "[request_definition]|r = sub, obj, act|[policy_definition]|p = sub, obj, act|[role_definition]|g = _, _|[policy_effect]|e = some(where (p.eft == allow))|[matchers]|m = g(r.sub, p.sub) && r.obj == p.obj && r.act == p.act" -p "p, alice, data1, read|p, bob, data2, write|p, data2_admin, data2, read|p, data2_admin, data2, write|g, alice, data2_admin" -e "alice, data1, read"
+    ./casbin enforce -m "[request_definition]|r = sub, obj, act|[policy_definition]|p = sub, obj, act|[role_definition]|g = _, _|[policy_effect]|e = some(where (p.eft == allow))|[matchers]|m = g(r.sub, p.sub) && r.obj == p.obj && r.act == p.act" -p "p, alice, data1, read|p, bob, data2, write|p, data2_admin, data2, read|p, data2_admin, data2, write|g, alice, data2_admin" "alice" "data1" "read"
     ```
-  > Allow
+    > Allowed
 
 - Check whether Alice has write permission for data2. If so, display the effective policy.
 

src/main/java/org/casbin/Client.java

@@ -20,6 +20,7 @@ public class Client {
     private static final String RBAC_WITH_DOMAINS_COMMAND = "rbac_with_domains";
     private static final String ROLEMANAGER_COMMAND = "role_manager";
     private static final String MANAGEMENT_COMMAND = "management";
+    private static final String ENFORCE_COMMAND = "enforce";
 
     private static final Map<String, AbstractCommand> COMMANDS = new HashMap<>();
 
@@ -29,6 +30,7 @@ public class Client {
         COMMANDS.put(RBAC_WITH_DOMAINS_COMMAND, new RBACWithDomainsCommand());
         COMMANDS.put(ROLEMANAGER_COMMAND, new RoleManagerCommand());
         COMMANDS.put(MANAGEMENT_COMMAND, new ManagementCommand());
+        COMMANDS.put(ENFORCE_COMMAND, new EnforceCommand());
     }
 
     public static String run(String... args) {

src/main/java/org/casbin/command/EnforceCommand.java

@@ -0,0 +1,15 @@
+package org.casbin.command;
+
+import org.casbin.NewEnforcer;
+
+public class EnforceCommand extends AbstractCommand {
+    @Override
+    public String run(NewEnforcer enforcer, String... args) throws Exception {
+        String subject = args[0];
+        String object = args[1];
+        String action = args[2];
+        boolean res = enforcer.enforce(subject, object, action);
+        System.out.println(res ? "Allowed" : "Denied");
+        return String.valueOf(res);
+    }
+}

src/test/java/org/casbin/ClientTest.java

@@ -111,4 +111,9 @@ public void testCustomFunction() throws ParseException {
 
         }
 
+        @Test
+        public void testEnforce() {
+            assertEquals(Client.run(new String[]{"enforce","-m","examples/rbac_model.conf","-p","examples/rbac_policy.csv", "alice", "data1", "read"}), "true");
+        }
+
 }