Constellation, Spacedust, Slingshot, UFOs: atproto crates and services for microcosm
proxy: use service cache
author
phil
date
(Feb 5, 2026, 5:53 PM -0500)
commit
741ef2f0
741ef2f0cdc2035e18bb8384762900f90998e9ef
parent
96473329
9647332955a8d25962233a6e884f7e42860752af
+42
-48
+6
slingshot/src/error.rs
+6
slingshot/src/error.rs
···
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UrlParseError(#[from] url::ParseError),
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#[error(transparent)]
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ReqwestError(#[from] reqwest::Error),
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#[error(transparent)]
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IdentityError(#[from] IdentityError),
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#[error("upstream service could not be resolved")]
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ServiceNotFound,
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#[error("upstream service was found but no services matched")]
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ServiceNotMatched,
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}
+1
-1
slingshot/src/main.rs
+1
-1
slingshot/src/main.rs
···
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log::info!("identity service ready.");
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let repo = Repo::new(identity.clone());
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-
let proxy = Proxy::new(repo.clone());
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let proxy = Proxy::new(repo.clone(), identity.clone());
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let identity_for_server = identity.clone();
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let server_shutdown = shutdown.clone();
+17
-45
slingshot/src/proxy.rs
+17
-45
slingshot/src/proxy.rs
···
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-
use serde::Deserialize;
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use atrium_api::types::string::{Did, Nsid};
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use url::Url;
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use std::{collections::HashMap, time::Duration};
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use crate::{Repo, server::HydrationSource, error::ProxyError};
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use crate::{Repo, Identity, server::HydrationSource, error::ProxyError};
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use reqwest::Client;
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use serde_json::{Map, Value};
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···
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#[derive(Clone)]
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pub struct Proxy {
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repo: Repo,
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identity: Identity,
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client: Client,
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}
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impl Proxy {
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pub fn new(repo: Repo) -> Self {
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pub fn new(repo: Repo, identity: Identity) -> Self {
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let client = Client::builder()
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.user_agent(format!(
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"microcosm slingshot v{} (contact: @bad-example.com)",
···
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.timeout(Duration::from_secs(6))
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.build()
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.unwrap();
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Self { repo, client }
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Self { repo, client, identity }
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}
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pub async fn proxy(
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&self,
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xrpc: String,
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service: String,
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service_did: &Did,
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service_id: &str,
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xrpc: &Nsid,
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params: Option<Map<String, Value>>,
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) -> Result<Value, ProxyError> {
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// hackin it to start
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// 1. assume did-web (TODO) and get the did doc
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#[derive(Debug, Deserialize)]
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struct ServiceDoc {
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id: String,
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service: Vec<ServiceItem>,
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}
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#[derive(Debug, Deserialize)]
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struct ServiceItem {
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id: String,
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#[expect(unused)]
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r#type: String,
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#[serde(rename = "serviceEndpoint")]
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service_endpoint: Url,
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}
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let dw = service.strip_prefix("did:web:").expect("a did web");
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let (dw, service_id) = dw.split_once("#").expect("whatever");
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let mut dw_url = Url::parse(&format!("https://{dw}"))?;
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dw_url.set_path("/.well-known/did.json");
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let doc: ServiceDoc = self.client
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.get(dw_url)
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.send()
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let mut upstream: Url = self
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.identity
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.did_to_mini_service_doc(service_did)
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.await?
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.error_for_status()?
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.json()
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.await?;
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.ok_or(ProxyError::ServiceNotFound)?
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.get(service_id, None)
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.ok_or(ProxyError::ServiceNotMatched)?
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.endpoint
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.parse()?;
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assert_eq!(doc.id, format!("did:web:{}", dw));
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let mut upstream = None;
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for ServiceItem { id, service_endpoint, .. } in doc.service {
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let Some((_, id)) = id.split_once("#") else { continue; };
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if id != service_id { continue; };
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upstream = Some(service_endpoint);
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break;
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}
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// 2. proxy the request forward
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let mut upstream = upstream.expect("to find it");
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upstream.set_path(&format!("/xrpc/{xrpc}")); // TODO: validate nsid
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upstream.set_path(&format!("/xrpc/{}", xrpc.as_str()));
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if let Some(params) = params {
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let mut query = upstream.query_pairs_mut();
+18
-2
slingshot/src/server.rs
+18
-2
slingshot/src/server.rs
···
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/// com.bad-example.identity.resolveService
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///
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/// resolve an atproto service did + id to its http endpoint
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///
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/// > [!important]
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/// > this endpoint is experimental and may change
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#[oai(
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path = "/com.bad-example.identity.resolveService",
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method = "get",
···
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Some(map)
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} else { None };
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let Some((service_did, id_fragment)) = payload.atproto_proxy.rsplit_once("#") else {
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return ProxyHydrateResponse::BadRequest(xrpc_error("BadParameter", "atproto_proxy could not be understood"));
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};
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let Ok(service_did) = service_did.parse() else {
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return ProxyHydrateResponse::BadRequest(xrpc_error("BadParameter", "atproto_proxy service did could not be parsed"));
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};
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let Ok(xrpc) = payload.xrpc.parse() else {
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return ProxyHydrateResponse::BadRequest(xrpc_error("BadParameter", "invalid NSID for xrpc param"));
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};
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match self.proxy.proxy(
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payload.xrpc,
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payload.atproto_proxy,
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&service_did,
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&format!("#{id_fragment}"),
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&xrpc,
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params,
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).await {
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Ok(skeleton) => {