feat: login page

lib/common/validator/validator.dart

@@ -0,0 +1,28 @@
+class AppValidator {
+  static String? validateEmail(String? value) {
+    if (value == null || value.isEmpty) {
+      return 'Email wajib diisi';
+    }
+    final emailRegex = RegExp(r'^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$');
+    if (!emailRegex.hasMatch(value)) {
+      return 'Format email tidak valid';
+    }
+    return null;
+  }
+
+  static String? validatePassword(String? value) {
+    if (value == null || value.isEmpty) {
+      return 'Password wajib diisi';
+    }
+    if (value.length < 8) {
+      return 'Password minimal 8 karakter';
+    }
+    // if (!RegExp(r'[A-Z]').hasMatch(value)) {
+    //   return 'Password harus mengandung huruf besar';
+    // }
+    // if (!RegExp(r'[0-9]').hasMatch(value)) {
+    //   return 'Password harus mengandung angka';
+    // }
+    return null;
+  }
+}