🔐 passcheck

passcheck is a flexible and lightweight password validation crate for Rust.
It allows you to define custom rules for checking password strength and structure — use only what you need!

🚀 Features

✅ Rule-based validation system
✅ Add only the checks you want: length, uppercase/lowercase, number, special char, etc.
✅ Supports custom error messages per rule via Option<&str>
✅ Lightweight and dependency-free
✅ Easy to use and extend with a fluent API

📦 Installation

Add this to your Cargo.toml:

[dependencies]

passcheck = "0.2.0"

🎯 Usage Example

use passcheck::PasswordChecker;

fn main() {
    let checker = PasswordChecker::new()
        .min_length(8, None)  // Use default error message with None OR use Some(str) for use custom message
        .require_upper_lower(None)
        .require_number(Some("Password must include at least one digit")) // Custom message
        .require_special_char(None);

    let password = "Ali@123";

    match checker.validate(password) {
        Ok(_) => println!("✅ Strong password!"),
        Err(errors) => {
            println!("❌ Invalid password:");
            for err in errors {
                println!("  - {}", err);
            }
        }
    }
}

🔧 Available Rules

min_length(n, Option<&str>) → Requires password to be at least n characters

require_upper_lower(Option<&str>) → Requires at least one uppercase and one lowercase letter

require_number(Option<&str>) → Requires at least one digit

require_special_char(Option<&str>) → Requires at least one special character

📄 License MIT