feat: fix the double quotes caused eval() bug (#443)

* feat: fix the double quotes caused eval() bug

* feat: fix the conf file

* feat: fix the test case

Author: tx2002

src/main/java/org/casbin/jcasbin/main/CoreEnforcer.java

@@ -42,6 +42,9 @@
 import java.util.function.BiPredicate;
 import java.util.function.Function;
 
+import static org.casbin.jcasbin.util.Util.hasEval;
+import static org.casbin.jcasbin.util.Util.splitCommaDelimitedList;
+
 /**
  * CoreEnforcer defines the core functionality of an enforcer.
  */
@@ -580,6 +583,7 @@ private EnforceResult enforce(String matcher, Object... rvals) {
         } else {
             expString = Util.removeComments(Util.escapeAssertion(matcher));
         }
+        boolean hasEval = hasEval(expString);
 
         // json process
         if (acceptJsonRequest) {
@@ -629,6 +633,9 @@ private EnforceResult enforce(String matcher, Object... rvals) {
 
             for (int i = 0; i < policy.size(); i++) {
                 List<String> pvals = policy.get(i);
+                if (hasEval) {
+                    pvals = splitCommaDelimitedList(pvals);
+                }
                 Map<String, Object> parameters = new HashMap<>(rvals.length + pTokens.length);
                 getPTokens(parameters, pType, pvals, pTokens);
                 getRTokens(parameters, rType, rvals);

src/main/java/org/casbin/jcasbin/util/Util.java

@@ -284,6 +284,21 @@ public static String[] splitCommaDelimited(String s) {
         return records;
     }
 
+    /**
+     * splits each string in the given list by commas according to CSV format
+     * and removes any extra double quotes
+     * @param rule the rule to be modified
+     * @return the modified rule
+     */
+    public static List<String> splitCommaDelimitedList(List<String> rule) {
+        List<String> modifiedRule = new ArrayList<>();
+        for (String s : rule) {
+            String[] strings = splitCommaDelimited(s);
+            modifiedRule.add(strings[0]);
+        }
+        return modifiedRule;
+    }
+
     /**
      * setEquals determines whether two string sets are identical.
      *
@@ -314,7 +329,7 @@ public static boolean setEquals(List<String> a, List<String> b) {
     }
 
     public static boolean hasEval(String exp) {
-        return evalReg.matcher(exp).matches();
+        return evalReg.matcher(exp).find();
     }
 
     public static String replaceEval(String s, String replacement) {

src/test/java/org/casbin/jcasbin/main/AbacAPIUnitTest.java

@@ -14,8 +14,10 @@
 
 package org.casbin.jcasbin.main;
 
-import org.casbin.jcasbin.util.Util;
 import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Map;
 import java.util.HashMap;
 
@@ -42,6 +44,15 @@ public void testEval() {
         alice.setAge(60);
         testEnforce(e, alice, "/data2", "read", false);
         testEnforce(e, alice, "/data2", "write", false);
+
+        List<String> rule = new ArrayList<>();
+        rule.add("\"r.sub.name == 'alice,green'\"");
+        rule.add("data1");
+        rule.add("read");
+        e.addPolicy(rule);
+
+        TestEvalRule aliceGreen = new TestEvalRule("alice,green", 18);
+        testEnforce(e, aliceGreen, "data1", "read", true);
     }
 
     @Test

src/test/java/org/casbin/jcasbin/main/UtilTest.java

@@ -27,6 +27,7 @@
 import java.io.IOException;
 import java.io.StringReader;
 
+import static org.casbin.jcasbin.util.Util.hasEval;
 import static org.junit.Assert.*;
 import static org.mockito.ArgumentMatchers.*;
 
@@ -84,6 +85,13 @@ public void testSplitCommaDelimited(){
     assertArrayEquals(new String[]{"a b", "c", "d"}, Util.splitCommaDelimited("\"a b\", c, d"));
   }
 
+  @Test
+  public void testHasEval() {
+      assertTrue(hasEval("eval(test)"));
+      assertTrue(hasEval("r_act == p_act && eval(p_sub_rule) && eval(p_obj_rule)"));
+      assertFalse(hasEval("evaltest"));
+  }
+
   @Test
   public void testReplaceEval() {
       Util.logPrint(Util.replaceEval("eval(test)", "testEval"));