add password validator

src/validators/password.validator.ts

@@ -0,0 +1,33 @@
+import {
+  registerDecorator,
+  ValidationOptions,
+  ValidatorConstraint,
+  ValidatorConstraintInterface,
+} from 'class-validator';
+
+@ValidatorConstraint({ async: false })
+export class IsPasswordStrongConstraint
+  implements ValidatorConstraintInterface
+{
+  validate(password: string) {
+    const regex =
+      /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$/;
+    return regex.test(password);
+  }
+
+  defaultMessage() {
+    return 'password must be at least 8 characters long and include at least one uppercase letter, one lowercase letter, one numeric digit, and one special character.';
+  }
+}
+
+export function IsPasswordStrong(validationOptions?: ValidationOptions) {
+  return function (object: Record<string, any>, propertyName: string) {
+    registerDecorator({
+      target: object.constructor,
+      propertyName: propertyName,
+      options: validationOptions,
+      constraints: [],
+      validator: IsPasswordStrongConstraint,
+    });
+  };
+}