feat(utils): add validateAndParseAddress function

__tests__/utils/address.test.ts

@@ -0,0 +1,15 @@
+import { validateAndParseAddress } from '../../src/utils/address';
+
+describe('validateAndParseAddress', () => {
+  test('should pass when correct starknet address is passed', () => {
+    const addr = '0x07ee790591d9fa3efc87067d95a643f8455e0b8190eb8cb7bfd39e4fb7571fdf';
+
+    return expect(validateAndParseAddress(addr)).toEqual(addr);
+  });
+
+  test('should add 0x prefix if not provided', () => {
+    const addr = '07ee790591d9fa3efc87067d95a643f8455e0b8190eb8cb7bfd39e4fb7571fdf';
+
+    return expect(validateAndParseAddress(addr)).toEqual(`0x${addr}`);
+  });
+});

src/index.ts

@@ -19,3 +19,4 @@ export * as ec from './utils/ellipticCurve';
 export * as uint256 from './utils/uint256';
 export * as shortString from './utils/shortString';
 export * as typedData from './utils/typedData';
+export * from './utils/address';

src/utils/address.ts

@@ -0,0 +1,14 @@
+export function validateAndParseAddress(address: string): string {
+  let result = null;
+  if (typeof address !== 'string') {
+    throw new Error('Invalid Address Type');
+  }
+
+  if (!address.match(/^(0x)?[0-9a-fA-F]{63,64}$/)) {
+    throw new Error('Invalid Address Format');
+  }
+
+  result = address.substring(0, 2) === '0x' ? address : `0x${address}`;
+
+  return result;
+}