chore: 7702 validation improvements

Author: hanzel98

packages/delegation-toolkit/src/actions/isValid7702Implementation.ts

@@ -26,12 +26,12 @@ export type IsValid7702ImplementationParameters = {
  * @returns The delegated contract address or null if not a valid delegation.
  */
 function extractDelegatedAddress(code: Hex | undefined): Address | null {
-  if (!code || code.length !== 48) {
+  if (code?.length !== 48) {
     // 0x (2 chars) + ef0100 (6 chars) + address (40 chars) = 48 chars
     return null;
   }
 
-  if (!code.startsWith(DELEGATION_PREFIX)) {
+  if (!code.toLowerCase().startsWith(DELEGATION_PREFIX.toLowerCase())) {
     return null;
   }
 

packages/delegation-toolkit/test/actions/isValid7702Implementation.test.ts

@@ -76,9 +76,9 @@ describe('isValid7702Implementation', () => {
       expect(result).toBe(true);
     });
 
-    it('should return false when delegation prefix uses different case (case-sensitive prefix)', async () => {
+    it('should return true when delegation prefix uses different case (case-insensitive prefix)', async () => {
       const testAddress = '0xdddddddddddddddddddddddddddddddddddddddd';
-      // Use uppercase delegation prefix - this should fail because startsWith is case-sensitive
+      // Use uppercase delegation prefix - this should now pass because we handle case-insensitivity
       const delegationCode = '0xEF01004000000000000000000000000000000000000000';
       mockGetCode.mockResolvedValue(delegationCode);
 
@@ -88,7 +88,22 @@ describe('isValid7702Implementation', () => {
         environment: mockEnvironment,
       });
 
-      expect(result).toBe(false);
+      expect(result).toBe(true);
+    });
+
+    it('should return true when delegation prefix uses mixed case', async () => {
+      const testAddress = '0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee';
+      // Use mixed case delegation prefix to test case-insensitivity thoroughly
+      const delegationCode = '0xEf01004000000000000000000000000000000000000000';
+      mockGetCode.mockResolvedValue(delegationCode);
+
+      const result = await isValid7702Implementation({
+        client: publicClient,
+        accountAddress: testAddress,
+        environment: mockEnvironment,
+      });
+
+      expect(result).toBe(true);
     });
   });