feat: implement enableAcceptJsonRequest API (#497)

Author: recanman

src/coreEnforcer.ts

@@ -61,6 +61,7 @@ export class CoreEnforcer {
   protected autoSave = true;
   protected autoBuildRoleLinks = true;
   protected autoNotifyWatcher = true;
+  protected acceptJsonRequest = false;
   protected fs?: FileSystem;
 
   /**
@@ -351,6 +352,15 @@ export class CoreEnforcer {
     this.autoNotifyWatcher = enable;
   }
 
+  /**
+   * enableAcceptJsonRequest determines whether to attempt parsing request args as JSON
+   *
+   * @param enable whether to attempt parsing request args as JSON
+   */
+  public enableAcceptJsonRequest(enable: boolean): void {
+    this.acceptJsonRequest = enable;
+  }
+
   /**
    * enableAutoBuildRoleLinks controls whether to save a policy rule
    * automatically to the adapter when it is added or removed.
@@ -477,9 +487,20 @@ export class CoreEnforcer {
           throw new Error(`invalid request size: expected ${rTokensLen}, got ${rvals.length}, rvals: ${rvals}"`);
         }
 
-        rTokens.forEach((token, j) => {
-          parameters[token] = rvals[j];
-        });
+        if (this.acceptJsonRequest) {
+          // Attempt to parse each request parameter as JSON; continue with string if failed
+          rTokens.forEach((token, j) => {
+            try {
+              parameters[token] = JSON.parse(rvals[j]);
+            } catch {
+              parameters[token] = rvals[j];
+            }
+          });
+        } else {
+          rTokens.forEach((token, j) => {
+            parameters[token] = rvals[j];
+          });
+        }
 
         p?.tokens.forEach((token, j) => {
           parameters[token] = p?.policy[i][j];

test/enforcer.test.ts

@@ -560,6 +560,10 @@ class TestSub {
     this.Name = name;
     this.Age = age;
   }
+
+  toJSONString(): string {
+    return JSON.stringify(this);
+  }
 }
 
 test('test ABAC Scaling', async () => {
@@ -837,3 +841,31 @@ test('TestEnforceWithMatcher', async () => {
   expect(await e.enforceWithMatcher(m2, 'data2_admin', 'data1', 'read')).toBe(true);
   expect(await e.enforceWithMatcher(m2, 'data2_admin', 'data1', 'write')).toBe(true);
 });
+
+test('TestEnforceWithEnableAcceptJsonRequest', async () => {
+  const e = await newEnforcer('examples/abac_rule_model.conf', 'examples/abac_rule_policy.csv');
+  e.enableAcceptJsonRequest(true);
+
+  const sub1 = new TestSub('alice', 16).toJSONString();
+  const sub2 = new TestSub('alice', 20).toJSONString();
+  const sub3 = new TestSub('alice', 65).toJSONString();
+
+  await testEnforce(e, sub1, '/data1', 'read', false);
+  await testEnforce(e, sub1, '/data2', 'read', false);
+  await testEnforce(e, sub1, '/data1', 'write', false);
+  await testEnforce(e, sub1, '/data2', 'write', true);
+  await testEnforce(e, sub2, '/data1', 'read', true);
+  await testEnforce(e, sub2, '/data2', 'read', false);
+  await testEnforce(e, sub2, '/data1', 'write', false);
+  await testEnforce(e, sub2, '/data2', 'write', true);
+  await testEnforce(e, sub3, '/data1', 'read', true);
+  await testEnforce(e, sub3, '/data2', 'read', false);
+  await testEnforce(e, sub3, '/data1', 'write', false);
+  await testEnforce(e, sub3, '/data2', 'write', false);
+
+  e.enableAcceptJsonRequest(false);
+  await testEnforce(e, sub1, '/data2', 'write', false);
+  await testEnforce(e, sub2, '/data1', 'read', false);
+  await testEnforce(e, sub2, '/data2', 'write', false);
+  await testEnforce(e, sub3, '/data1', 'read', false);
+});