feat: add base64 encoding function

src/lib/crypto.ts

@@ -39,3 +39,15 @@ export const createHash = async (
 
   return hash;
 };
+
+export const encodeToBase64 = (str: string): string => {
+  // Convert string to UTF-8 byte array
+  const utf8Bytes = new TextEncoder().encode(str);
+
+  // Convert byte array to base64 string
+  let binaryString = '';
+  for (let i = 0; i < utf8Bytes.length; i++) {
+    binaryString += String.fromCharCode(utf8Bytes[i]);
+  }
+  return btoa(binaryString);
+};

src/tests/crypto.spec.ts

@@ -1,7 +1,7 @@
 import nodeCrypto from 'node:crypto';
 import { beforeAll, describe, expect, it } from 'vitest';
 import { Request } from '../interfaces/index.js';
-import { createHash } from '../lib/crypto.js';
+import { createHash, encodeToBase64 } from '../lib/crypto.js';
 
 describe('crypto', () => {
   beforeAll(() => {
@@ -34,4 +34,26 @@ describe('crypto', () => {
       expect(hash).toEqual(expectedResultForAboveValues);
     });
   });
+
+  describe('encodeToBase64', () => {
+    it('should encode an ascii string to base64', () => {
+      const asciiString = 'Hello, World!';
+      const expectedResult = 'SGVsbG8sIFdvcmxkIQ==';
+
+      const base64String = encodeToBase64(asciiString);
+
+      expect(base64String).toBeTruthy();
+      expect(base64String).toEqual(expectedResult);
+    });
+
+    it('should encode a utf-8 string to base64', () => {
+      const utf8String = '👋🌍';
+      const expectedResult = '8J+Ri/CfjI0=';
+
+      const base64String = encodeToBase64(utf8String);
+
+      expect(base64String).toBeTruthy();
+      expect(base64String).toEqual(expectedResult);
+    });
+  });
 });