From 036a58b74f3a4d9cc4b75bdd52d062991c579e3b Mon Sep 17 00:00:00 2001
From: Dilip Kola <kdilipkola@gmail.com>
Date: Mon, 2 Sep 2024 15:35:14 +0530
Subject: [PATCH] feat: add util for applying json string template

---
 src/v0/util/index.js      |  6 ++++++
 src/v0/util/index.test.js | 24 ++++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/src/v0/util/index.js b/src/v0/util/index.js
index db84fb0627..e1fe8ee942 100644
--- a/src/v0/util/index.js
+++ b/src/v0/util/index.js
@@ -2268,6 +2268,11 @@ const validateEventAndLowerCaseConversion = (event, isMandatory, convertToLowerC
 const applyCustomMappings = (message, mappings) =>
   JsonTemplateEngine.createAsSync(mappings, { defaultPathType: PathType.JSON }).evaluate(message);
 
+const applyJSONStringTemplate = (message, template) =>
+  JsonTemplateEngine.createAsSync(template.replace(/{{/g, '${').replace(/}}/g, '}'), {
+    defaultPathType: PathType.JSON,
+  }).evaluate(message);
+
 /**
  * Gets url path omitting the hostname & protocol
  *
@@ -2293,6 +2298,7 @@ module.exports = {
   addExternalIdToTraits,
   adduserIdFromExternalId,
   applyCustomMappings,
+  applyJSONStringTemplate,
   base64Convertor,
   batchMultiplexedEvents,
   checkEmptyStringInarray,
diff --git a/src/v0/util/index.test.js b/src/v0/util/index.test.js
index 31ea490b25..a8d13ab873 100644
--- a/src/v0/util/index.test.js
+++ b/src/v0/util/index.test.js
@@ -9,6 +9,7 @@ const {
   combineBatchRequestsWithSameJobIds,
   validateEventAndLowerCaseConversion,
 } = require('./index');
+const exp = require('constants');
 
 // Names of the utility functions to test
 const functionNames = [
@@ -691,6 +692,29 @@ describe('extractCustomFields', () => {
   });
 });
 
+describe('applyJSONStringTemplate', () => {
+  it('should apply JSON string template to the payload', () => {
+    const payload = {
+      domain: 'abc',
+    };
+    const template = '`https://{{$.domain}}.com`';
+
+    const result = utilities.applyJSONStringTemplate(payload, template);
+    expect(result).toEqual('https://abc.com');
+  });
+
+  it('should apply JSON string template to the payload multiple times', () => {
+    const payload = {
+      domain: 'abc',
+      subdomain: 'def',
+    };
+    const template = '`https://{{$.subdomain}}.{{$.domain}}.com`';
+
+    const result = utilities.applyJSONStringTemplate(payload, template);
+    expect(result).toEqual('https://def.abc.com');
+  });
+});
+
 describe('get relative path from url', () => {
   test('valid url', () => {
     expect(utilities.getRelativePathFromURL('https://google.com/a/b/c')).toEqual('/a/b/c');