tokio-gemini/examples/simple.rs

use async_trait::async_trait;
use tokio_gemini::{
    certs::{fingerprint::CertFingerprint, SelfsignedCertVerifier},
    Client, LibError,
};

// Much simpler than examples/main.rs
// Hardcoded URL, no cert check, always write to stdout
//
// cargo add tokio-gemini
// cargo add tokio -F macros,rt-multi-thread
//

const URL: &str = "gemini://geminiprotocol.net/docs/protocol-specification.gmi";

#[tokio::main]
async fn main() -> Result<(), LibError> {
    let client = Client::builder()
        .with_selfsigned_cert_verifier(CertVerifier)
        .build();

    match client.request(URL).await?.ensure_ok() {
        Ok(mut resp) => {
            println!("{}", resp.text().await?);
        }
        Err(resp) => {
            println!("{} {}", resp.status().num(), resp.message());
        }
    }

    Ok(())
}

struct CertVerifier;

#[async_trait]
impl SelfsignedCertVerifier for CertVerifier {
    async fn verify(
        &self,
        cert: &tokio_gemini::certs::CertificateDer<'_>,
        host: &str,
        port: u16,
    ) -> Result<bool, tokio_gemini::LibError> {
        // For real verification example with known_hosts and DANE
        // see examples/main.rs
        eprintln!(
            "Host = {}:{}\nFingerprint = {}",
            host,
            port,
            CertFingerprint::new_sha256(cert).base64(),
        );
        Ok(true)
    }
}