PluralKit/services/api/src/middleware/authnz.rs

use axum::{
    extract::{Request, State},
    http::HeaderValue,
    middleware::Next,
    response::Response,
};
use tracing::error;

use crate::ApiContext;

pub async fn authnz(State(ctx): State<ApiContext>, mut request: Request, next: Next) -> Response {
    let headers = request.headers_mut();
    headers.remove("x-pluralkit-systemid");
    let auth_header = headers
        .get("authorization")
        .map(|h| h.to_str().ok())
        .flatten();
    if let Some(auth_header) = auth_header {
        if let Some(system_id) =
            match libpk::db::repository::legacy_token_auth(&ctx.db, auth_header).await {
                Ok(val) => val,
                Err(err) => {
                    error!(?err, "failed to query authorization token in postgres");
                    None
                }
            }
        {
            headers.append(
                "x-pluralkit-systemid",
                HeaderValue::from_str(format!("{system_id}").as_str()).unwrap(),
            );
        }
    }
    next.run(request).await
}