diff --git a/src/enforcer.ts b/src/enforcer.ts
index 2e1903b..fd0f2c3 100644
--- a/src/enforcer.ts
+++ b/src/enforcer.ts
@@ -348,6 +348,44 @@ export class Enforcer extends ManagementEnforcer {
     return res;
   }
 
+  /**
+   * getImplicitResourcesForUser returns all policies that user obtaining in domain.
+   */
+  public async getImplicitResourcesForUser(user: string, ...domain: string[]): Promise<string[][]> {
+    const permissions = await this.getImplicitPermissionsForUser(user, ...domain);
+    const res: string[][] = [];
+    for (const permission of permissions) {
+      if (permission[0] === user) {
+        res.push(permission);
+        continue;
+      }
+      let resLocal: string[][] = [[user]];
+      const tokensLength: number = permission.length;
+      const t: string[][] = [];
+      for (const token of permission) {
+        if (token === permission[0]) {
+          continue;
+        }
+        const tokens: string[] = await this.getImplicitUsersForRole(token, ...domain);
+        tokens.push(token);
+        t.push(tokens);
+      }
+      for (let i = 0; i < tokensLength - 1; i++) {
+        const n: string[][] = [];
+        for (const tokens of t[i]) {
+          for (const policy of resLocal) {
+            const t: string[] = [...policy];
+            t.push(tokens);
+            n.push(t);
+          }
+        }
+        resLocal = n;
+      }
+      res.push(...resLocal);
+    }
+    return res;
+  }
+
   /**
    * getImplicitUsersForRole gets implicit users that a role has.
    * Compared to getUsersForRole(), this function retrieves indirect users besides direct users.
diff --git a/src/managementEnforcer.ts b/src/managementEnforcer.ts
index c1d7cf4..1393c0d 100644
--- a/src/managementEnforcer.ts
+++ b/src/managementEnforcer.ts
@@ -508,6 +508,29 @@ export class ManagementEnforcer extends InternalEnforcer {
     return this.removeFilteredPolicyInternal('g', ptype, fieldIndex, fieldValues, true);
   }
 
+  /**
+   * UpdateGroupingPolicy updates an rule to the current named policy.
+   *
+   * @param oldRule the old rule.
+   * @param newRule the new rule.
+   * @return succeeds or not.
+   */
+  public async updateGroupingPolicy(oldRule: string[], newRule: string[]): Promise<boolean> {
+    return this.updateNamedGroupingPolicy('g', oldRule, newRule);
+  }
+
+  /**
+   * updateNamedGroupingPolicy updates an rule to the current named policy.
+   *
+   * @param ptype the policy type, can be "g", "g2", "g3", ..
+   * @param oldRule the old rule.
+   * @param newRule the new rule.
+   * @return succeeds or not.
+   */
+  public async updateNamedGroupingPolicy(ptype: string, oldRule: string[], newRule: string[]): Promise<boolean> {
+    return this.updatePolicyInternal('g', ptype, oldRule, newRule, true);
+  }
+
   /**
    * addFunction adds a customized function.
    * @param name custom function name
diff --git a/src/syncedEnforcer.ts b/src/syncedEnforcer.ts
index c4e6b99..bbc1146 100644
--- a/src/syncedEnforcer.ts
+++ b/src/syncedEnforcer.ts
@@ -479,6 +479,29 @@ export class SyncedEnforcer extends Enforcer {
     return super.removeFilteredNamedGroupingPolicy(ptype, fieldIndex, ...fieldValues).finally(() => this.lock.release());
   }
 
+  /**
+   * UpdateGroupingPolicy updates an rule to the current named policy.
+   *
+   * @param oldRule the old rule.
+   * @param newRule the new rule.
+   * @return succeeds or not.
+   */
+  public async updateGroupingPolicy(oldRule: string[], newRule: string[]): Promise<boolean> {
+    return super.updateGroupingPolicy(oldRule, newRule);
+  }
+
+  /**
+   * updateNamedGroupingPolicy updates an rule to the current named policy.
+   *
+   * @param ptype the policy type, can be "g", "g2", "g3", ..
+   * @param oldRule the old rule.
+   * @param newRule the new rule.
+   * @return succeeds or not.
+   */
+  public async updateNamedGroupingPolicy(ptype: string, oldRule: string[], newRule: string[]): Promise<boolean> {
+    return super.updateNamedGroupingPolicy(ptype, oldRule, newRule);
+  }
+
   /**
    * add matching function to RoleManager by ptype
    * @param ptype g
diff --git a/test/managementAPI.test.ts b/test/managementAPI.test.ts
index fde73c6..2afc92e 100644
--- a/test/managementAPI.test.ts
+++ b/test/managementAPI.test.ts
@@ -353,3 +353,27 @@ test('removeNamedGroupingPolicies', async () => {
   const removed = await e.removeNamedGroupingPolicies('g', groupingRules);
   expect(removed).toBe(true);
 });
+
+test('updateGroupingPolicy', async () => {
+  const a = new FileAdapter('examples/rbac_policy.csv');
+  e.setAdapter(a);
+
+  let groupingPolicy = await e.getGroupingPolicy();
+  testArray2DEquals(groupingPolicy, [['alice', 'data2_admin']]);
+
+  const updated = e.updateGroupingPolicy(['alice', 'data2_admin'], ['alice', 'update_test']);
+  groupingPolicy = await e.getGroupingPolicy();
+  testArray2DEquals(groupingPolicy, [['alice', 'update_test']]);
+});
+
+test('updateNamedGroupingPolicy', async () => {
+  const a = new FileAdapter('examples/rbac_policy.csv');
+  e.setAdapter(a);
+
+  let groupingPolicy = await e.getGroupingPolicy();
+  testArray2DEquals(groupingPolicy, [['alice', 'data2_admin']]);
+
+  const updated = e.updateNamedGroupingPolicy('g', ['alice', 'data2_admin'], ['alice', 'update_test']);
+  groupingPolicy = await e.getGroupingPolicy();
+  testArray2DEquals(groupingPolicy, [['alice', 'update_test']]);
+});
diff --git a/test/rbacAPI.test.ts b/test/rbacAPI.test.ts
index 98dc40b..32b45a0 100644
--- a/test/rbacAPI.test.ts
+++ b/test/rbacAPI.test.ts
@@ -75,6 +75,28 @@ test('test getImplicitPermissionsForUser', async () => {
   ]);
 });
 
+test('test getImplicitResourcesForUser', async () => {
+  const e = await newEnforcer('examples/rbac_with_pattern_model.conf', 'examples/rbac_with_pattern_policy.csv');
+  expect(await e.getImplicitResourcesForUser('alice')).toEqual([
+    ['alice', '/pen/1', 'GET'],
+    ['alice', '/pen2/1', 'GET'],
+    ['alice', '/book/*', 'GET'],
+    ['alice', '/book/:id', 'GET'],
+    ['alice', '/book2/{id}', 'GET'],
+    ['alice', 'book_group', 'GET'],
+  ]);
+  expect(await e.getImplicitResourcesForUser('bob')).toEqual([
+    ['bob', '/pen/:id', 'GET'],
+    ['bob', '/pen2/{id}', 'GET'],
+    ['bob', 'pen_group', 'GET'],
+  ]);
+  expect(await e.getImplicitResourcesForUser('cathy')).toEqual([
+    ['cathy', '/pen/:id', 'GET'],
+    ['cathy', '/pen2/{id}', 'GET'],
+    ['cathy', 'pen_group', 'GET'],
+  ]);
+});
+
 test('test deleteRolesForUser', async () => {
   const e = await newEnforcer('examples/rbac_model.conf', 'examples/rbac_with_hierarchy_policy.csv');
   expect(await e.hasPermissionForUser('bob', 'data2', 'write')).toEqual(true);