malice

use std::path::Path;

use crate::{Allowlist, Sender, Vapid};

/// `MALICE_PUBLIC_URL`, the origin browsers and the homeserver reach this server at.

pub fn public_url() -> Option<String> {

    let url = std::env::var("MALICE_PUBLIC_URL").ok()?;

    let url = url.trim().trim_end_matches('/');

    match url::Url::parse(url) {

        Ok(parsed) if matches!(parsed.scheme(), "http" | "https") && parsed.has_host() => {

            Some(url.to_owned())

        }

        _ => {

            tracing::warn!("ignoring MALICE_PUBLIC_URL, it is not an http(s) URL");

            None

        }

    }

}

/// The VAPID `sub`: `MALICE_PUSH_CONTACT`, else the public URL.

pub fn contact(public_url: Option<&str>) -> String {

    std::env::var("MALICE_PUSH_CONTACT")

        .ok()

        .map(|contact| contact.trim().to_owned())

        .filter(|contact| contact.starts_with("mailto:") || contact.starts_with("https://"))

        .or_else(|| {

            public_url

                .filter(|url| url.starts_with("https://"))

                .map(str::to_owned)

        })

        .unwrap_or_else(|| "mailto:webpush@localhost".to_owned())

}

/// A sender with the VAPID key kept in `dir`, configured from the environment.

pub fn sender(dir: &Path, public_url: Option<&str>) -> Result<Sender, String> {

    let vapid = Vapid::load_or_create(&dir.join("vapid.pk8"))?;

    Sender::new(vapid, contact(public_url), Allowlist::from_env())

}