Add jsonpath package and tests for schema

packages/taco/package.json

@@ -43,6 +43,7 @@
     "@nucypher/nucypher-core": "*",
     "@nucypher/shared": "workspace:*",
     "ethers": "^5.7.2",
+    "jsonpath-plus": "^9.0.0",
     "semver": "^7.5.2",
     "zod": "^3.22.4"
   },

packages/taco/src/conditions/base/json-api.ts

@@ -1,3 +1,4 @@
+import { JSONPath } from 'jsonpath-plus';
 import { z } from 'zod';
 
 import { Condition } from '../condition';
@@ -12,7 +13,19 @@ export const JsonApiConditionSchema = z.object({
   conditionType: z.literal(JsonApiConditionType).default(JsonApiConditionType),
   endpoint: z.string().url(),
   parameters: z.record(z.string(), z.unknown()).optional(),
-  query: z.string().optional(),
+  query: z.string().refine(
+    (path) => {
+      try {
+        JSONPath.toPathArray(path);
+        return true;
+      } catch (error) {
+        return false;
+      }
+    },
+    {
+      message: "Invalid JSON path",
+    }
+  ),
   returnValueTest: returnValueTestSchema, // Update to allow multiple return values after expanding supported methods
 });
 

packages/taco/test/conditions/base/json.test.ts

@@ -35,7 +35,22 @@ describe('JsonApiCondition', () => {
         },
       });
     });
-
+    it('rejects an invalid json path', () => {
+      const badJsonApiObj = {
+        ...testJsonApiConditionObj,
+        query: '$.store.book[?(@.price < ]',
+      };
+
+      const result = JsonApiCondition.validate(JsonApiConditionSchema, badJsonApiObj);
+
+      expect(result.error).toBeDefined();
+      expect(result.data).toBeUndefined();
+      expect(result.error?.format()).toMatchObject({
+        endpoint: {
+          _errors: ['Invalid JSON path'],
+        },
+      });
+    });    
     describe('parameters', () => {
       it('accepts conditions without query path', () => {
         const { query, ...noQueryObj} = testJsonApiConditionObj;