zero4rs 2.0.0

zero4rs is a powerful, pragmatic, and extremely fast web framework for Rust
Documentation 
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use actix_web::{HttpResponse, Responder};
use base64::{engine::general_purpose, Engine as _};

use captcha::filters::{Cow, Noise, Wave};
use captcha::{Captcha, Geometry};

// https://github.com/daniel-e/rust-captcha/blob/master/src/methods/mod.rs
pub async fn captcha() -> impl Responder {
    let mut c = Captcha::new();

    c.add_chars(5)
        .apply_filter(Noise::new(0.2))
        .apply_filter(Wave::new(2.0, 20.0))
        .view(220, 80)
        .apply_filter(
            Cow::new()
                .min_radius(40)
                .max_radius(50)
                .circles(1)
                .area(Geometry::new(40, 150, 50, 70)),
        );

    log::debug!(
        "CAPTCHA with text {} written to captcha.png",
        c.chars_as_string()
    );

    // 获取 PNG 图像数据为 Vec<u8>
    let image_data = match c.as_png() {
        Some(data) => data,
        None => {
            return HttpResponse::InternalServerError().body("CAPTCHA generation failed");
        }
    };

    let b64 = general_purpose::STANDARD.encode(&image_data);

    HttpResponse::Ok()
        .content_type("text/plain")
        .body(format!("data:image/png;base64,{}", b64))
}