rok-core 0.6.1

Core primitives for the rok ecosystem — errors, crypto, i18n, config, DI, and more
Documentation 
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use super::loader::LocaleStore;
use std::{
    future::Future,
    pin::Pin,
    sync::Arc,
    task::{Context, Poll},
};
use tower::{Layer, Service};

pub struct I18nContext {
    pub locale: String,
    pub default_locale: String,
    pub store: LocaleStore,
}

tokio::task_local! {
    pub static CURRENT_I18N: Arc<I18nContext>;
}

#[derive(Clone)]
pub struct I18nLayer {
    store: LocaleStore,
    default_locale: String,
}

impl I18nLayer {
    pub fn new(store: LocaleStore, default_locale: impl Into<String>) -> Self {
        Self {
            store,
            default_locale: default_locale.into(),
        }
    }

    pub fn with_dir(dir: impl AsRef<std::path::Path>, default_locale: impl Into<String>) -> Self {
        let default = default_locale.into();
        let store = super::loader::load_dir(dir, &default);
        Self {
            store,
            default_locale: default,
        }
    }
}

impl<S: Clone> Layer<S> for I18nLayer {
    type Service = I18nService<S>;

    fn layer(&self, inner: S) -> Self::Service {
        I18nService {
            inner,
            store: Arc::clone(&self.store),
            default_locale: self.default_locale.clone(),
        }
    }
}

#[derive(Clone)]
pub struct I18nService<S> {
    inner: S,
    store: LocaleStore,
    default_locale: String,
}

impl<S, ReqBody> Service<http::Request<ReqBody>> for I18nService<S>
where
    S: Service<http::Request<ReqBody>> + Clone + Send + 'static,
    S::Future: Send + 'static,
    ReqBody: Send + 'static,
{
    type Response = S::Response;
    type Error = S::Error;
    type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;

    fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
        self.inner.poll_ready(cx)
    }

    fn call(&mut self, req: http::Request<ReqBody>) -> Self::Future {
        let locale = detect_locale(
            req.uri().query(),
            req.headers()
                .get("accept-language")
                .and_then(|v| v.to_str().ok()),
            &self.default_locale,
        );
        let ctx = Arc::new(I18nContext {
            locale,
            default_locale: self.default_locale.clone(),
            store: Arc::clone(&self.store),
        });
        let fut = self.inner.call(req);
        Box::pin(CURRENT_I18N.scope(ctx, fut))
    }
}

fn detect_locale(query: Option<&str>, accept_lang: Option<&str>, default: &str) -> String {
    if let Some(q) = query {
        for pair in q.split('&') {
            let mut kv = pair.splitn(2, '=');
            if kv.next() == Some("lang") {
                if let Some(val) = kv.next() {
                    let lang = val.split('-').next().unwrap_or(val).to_lowercase();
                    if !lang.is_empty() {
                        return lang;
                    }
                }
            }
        }
    }
    if let Some(header) = accept_lang {
        if let Some(first) = header.split(',').next() {
            let tag = first.split(';').next().unwrap_or("").trim();
            let primary = tag.split('-').next().unwrap_or("").to_lowercase();
            if !primary.is_empty() {
                return primary;
            }
        }
    }
    std::env::var("APP_LOCALE").unwrap_or_else(|_| default.to_string())
}