Fixed license and semgrep issues (#282)

Author: sunil-lakshman

README.md

@@ -291,7 +291,7 @@ data.then(function(sync_data,  err) {
 
 ### The MIT License (MIT)
 
-Copyright © 2012-2024 [Contentstack](https://www.contentstack.com). All Rights Reserved
+Copyright © 2012-2025 [Contentstack](https://www.contentstack.com). All Rights Reserved
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 

index.d.ts

@@ -151,7 +151,7 @@ export class Stack {
     clearByContentType(): Stack;
     clearAll(): Stack;
     getCacheProvider(): object;
-    getLastActivities(): Promise<any>;;
+    getLastActivities(): Promise<any>;
     getContentTypes(param?: object): Promise<ContentTypeCollection>;
     sync(params: object): Promise<SyncResult>;
     imageTransform(url: string, params: any): string;

src/core/contentstack.js

@@ -3,12 +3,10 @@ import CacheProvider from './cache-provider/index';
 import ContentstackRegion from "./contentstackregion";
 
  /**
- * @class 
-  Contentstack 
-* @description Creates an instance of `Contentstack`.
-* @instance
-*/
-
+ * @class Contentstack 
+ * @description Creates an instance of `Contentstack`.
+ * @instance
+ */
 class Contentstack {
 
 	constructor(){
@@ -45,8 +43,8 @@ class Contentstack {
 		// Iterate through each object in _embedded_items and update the asset link
 		for (let key in entry._embedded_items) {
 			let embedded_item = entry._embedded_items[key];
-			if (Array.isArray(embedded_item)) {
 
+			if (Array.isArray(embedded_item)) {
 				embedded_item.forEach((item) => {
 
 					if (item._content_type_uid == 'sys_assets' && item.filename) {
@@ -62,14 +60,24 @@ class Contentstack {
 									return;
 								}
 							}
-						}
-						let _entry = {...entry};
+						};
+
+						let _entry = { ...entry };
 						const keys = key.split(".");
+						const unsafeKeys = new Set(["__proto__", "constructor", "prototype"]);
+
 						for (const k of keys) {
-							if (_entry[k]) _entry = _entry[k];
-							else if (_entry.length) {
+							// Ensure key is safe before accessing it
+							if (unsafeKeys.has(k)) continue;
+
+							if (_entry && typeof _entry === "object" && _entry !== null && Object.prototype.hasOwnProperty.call(_entry, k)) {
+								const newEntry = _entry[k];
+								if (typeof newEntry === "object" && newEntry !== null) {
+									_entry = newEntry;
+								}
+							} else if (Array.isArray(_entry)) {
 								for (const block of _entry) {
-									if (block[k]) {
+									if (block && typeof block === "object" && Object.prototype.hasOwnProperty.call(block, k)) {
 										_entry = block[k];
 									}
 								}