It is an example to verify password format by given configuration

Since you New a Password.Service, you need set follows configuration to tell what kind of rule set you want:
(uint8)
minLength: the short password request maxLength: the maximum password length be accepted (bool)
requireUppercase: Do you require at least one uppercase character in password?
requireLowercase: Do you require at least one lowercase character in password?
requireNumber: Do you require at least one number character in password?
allowSequence: Do you allowed sequence characters in password?
requireSymbol: Do you require at least one special symbol in password?

And while password be varified by Password.Validtor it will return multiple values length, uppercase, lowercase, number, symbol, sequence in bool type, err in error type).

If err return is not nil, which mean password does not meets the configuration.
Others parameters can help to tell you which rules been violation.

If you want applied this password validator in your project. You can use go mod to manage and get password validator module into your project

go get github.com/hsuanshao/pwd-verify/module/password

The you can import it in your project.

import (
    "github.com/hsuanshao/pwd-verify/module/password"
)

There are many dependency injection solition in Go. But I choose to do another example to implement dependency inejction solution by myself in this programming task. Which is placed in /app/infra/di.

parameters configuration can be set by flags

Other famous dependency injection solution:

Wire
Uber-Dig
sarulabs-di this almost similar to uber dig, but without use reflect, therefor, all deps must have unique name.

note: reflect affect performance.

You can get the example to get Password.Service by dependency injection in app/main.go

It is simple to run test, all you need to do is in root path of this project and type make test