http.rs 77.8%

112 of 144 lines run, 24 of 56 functions · run #8 on main · run missed

//! Tuner over HTTP (spec §15.1, §8.5, §21.1): `POST /mcp` on the Unix
//! socket and the loopback port, every request signed and checked before
//! anything else; the peer's uid read from the socket; `Origin` checked
//! against DNS rebinding.

use crate::protocol::{self, Headers, Reply};
use crate::tools::Ctx;
use axum::body::Bytes;
use axum::extract::connect_info::{ConnectInfo, Connected};
use axum::extract::State;
use axum::http::{HeaderMap, StatusCode};
use axum::response::sse::{Event as SseEvent, KeepAlive, Sse};
use axum::response::{IntoResponse, Response};
use axum::routing::post;
use axum::Router;
use futures::stream::{self, StreamExt};
use serde_json::{json, Value as Json};
use spectra_core::authn::Caller;
use spectra_core::daemon::{Daemon, Peer, WireEvent};
use spectra_core::principals::Principal;
use spectra_core::proof::Proof;
use std::convert::Infallible;
use std::sync::Arc;
use std::time::Duration;

/// Who is on the other end of a connection: a Unix peer, or TCP.
#[derive(Clone, Copy, Debug)]
pub struct PeerInfo(pub Option<Peer>);

impl Connected<axum::serve::IncomingStream<'_, tokio::net::UnixListener>> for PeerInfo {
    fn connect_info(stream: axum::serve::IncomingStream<'_, tokio::net::UnixListener>) -> Self {
        let cred = stream.io().peer_cred().ok();
        PeerInfo(cred.map(|c| Peer { uid: c.uid(), pid: c.pid() }))
    }
}

impl Connected<axum::serve::IncomingStream<'_, tokio::net::TcpListener>> for PeerInfo {
    fn connect_info(_: axum::serve::IncomingStream<'_, tokio::net::TcpListener>) -> Self {
        PeerInfo(None)
    }
}

/// The app state: the daemon, and the origins a browser may send from.
#[derive(Clone)]
pub struct AppState {
    pub daemon: Arc<Daemon>,
    pub origins: Arc<Vec<String>>,
}

/// Tuner's routes; the binary adds the API and Radar beside them.
pub fn router(state: AppState) -> Router {
    Router::new()
        .route("/mcp", post(mcp).get(not_allowed).delete(not_allowed))
        .route("/api/v1/ledger/events", post(owner_events))
        .with_state(state)
}

async fn not_allowed() -> StatusCode {
    StatusCode::METHOD_NOT_ALLOWED
}

/// The proof the signature headers carry, for `method_path` and `body`.
pub fn proof_from(headers: &HeaderMap, method_path: &str, body: &[u8]) -> Option<Proof> {
    let get = |k: &str| headers.get(k).and_then(|v| v.to_str().ok());
    let key = get("spectra-key")?;
    let time_ms = get("spectra-time")?.parse().ok()?;
    let nonce: [u8; 16] = hex::decode(get("spectra-nonce")?).ok()?.try_into().ok()?;
    let sig_bytes = hex::decode(get("spectra-signature")?).ok()?;
    let sig = oxy_core::cbor::decode(&sig_bytes).ok().and_then(|v| oxy_core::identity::Signature::from_value(&v).ok())?;
    if sig.key.to_hex() != key {
        return None;
    }
    Some(Proof { sig, method: method_path.into(), body_hash: *spectra_core::event::hash_body_plain(body), time_ms, nonce })
}

/// Refuse a browser request from a page that is not ours (spec §21.1).
pub fn origin_ok(headers: &HeaderMap, allowed: &[String]) -> bool {
    match headers.get("origin").and_then(|v| v.to_str().ok()) {
        None => true,
        Some(o) => allowed.iter().any(|a| a == o),
    }
}

/// Authenticate a request, or the response that refuses it.
pub async fn authenticate(
    state: &AppState,
    peer: PeerInfo,
    headers: &HeaderMap,
    method_path: &str,
    body: &[u8],
) -> Result<Caller, Response> {
    if !origin_ok(headers, &state.origins) {
        return Err((
            StatusCode::FORBIDDEN,
            axum::Json(protocol::error(&Json::Null, protocol::INVALID_REQUEST, "this origin may not call Spectra")),
        )
            .into_response());
    }
    let proof = proof_from(headers, method_path, body);
    state.daemon.authenticate(proof.as_ref(), method_path, body, peer.0).await.map_err(|why| {
        tracing::info!(%why, "refused a request");
        // The reason concerns the caller's own key, so the caller is told it:
        // an agent whose delegation expired must be able to say so.
        (
            StatusCode::UNAUTHORIZED,
            axum::Json(protocol::error(&Json::Null, protocol::UNAUTHENTICATED, &format!("not authenticated: {why}"))),
        )
            .into_response()
    })
}

async fn mcp(State(state): State<AppState>, ConnectInfo(peer): ConnectInfo<PeerInfo>, headers: HeaderMap, body: Bytes) -> Response {
    let caller = match authenticate(&state, peer, &headers, "POST /mcp", &body).await {
        Ok(c) => c,
        Err(r) => return r,
    };
    let req: Json = match serde_json::from_slice(&body) {
        Ok(v) => v,
        Err(e) => {
            return (StatusCode::BAD_REQUEST, axum::Json(protocol::error(&Json::Null, protocol::PARSE_ERROR, &format!("not JSON: {e}"))))
                .into_response()
        }
    };
    let new_session = req.pointer("/params/arguments/new_session").and_then(Json::as_bool).unwrap_or(false)
        && req.pointer("/params/name").and_then(Json::as_str) == Some("brief");
    let session = state.daemon.touch(&caller.principal, new_session).await;
    let h = Headers {
        version: headers.get("mcp-protocol-version").and_then(|v| v.to_str().ok()),
        method: headers.get("mcp-method").and_then(|v| v.to_str().ok()),
        name: headers.get("mcp-name").and_then(|v| v.to_str().ok()),
    };
    let version = h.version.unwrap_or("2025-03-26").to_string();
    let ctx = Ctx { daemon: state.daemon.clone(), caller, session };
    let meta = meta(&ctx).await;
    match protocol::handle(&ctx, &h, req, meta.clone()).await {
        Reply::Json(status, v) => (StatusCode::from_u16(status).unwrap_or(StatusCode::OK), axum::Json(v)).into_response(),
        Reply::Accepted => StatusCode::ACCEPTED.into_response(),
        Reply::Stream(id, tool, args) => {
            let fut = async move {
                let out = (tool.run)(&ctx, args).await;
                let meta = crate::http::meta(&ctx).await;
                let msg = protocol::stream_result(&id, &version, &out, meta);
                Ok::<_, Infallible>(SseEvent::default().event("message").data(msg.to_string()))
            };
            sse(stream::once(fut).boxed())
        }
        Reply::Listen(id, sub) => {
            let ack = json!({ "jsonrpc": "2.0", "method": "notifications/subscriptions/acknowledged", "params": { "_meta": { "io.modelcontextprotocol/subscriptionId": sub } } });
            let _ = id;
            let first = stream::once(async move { Ok::<_, Infallible>(SseEvent::default().event("message").data(ack.to_string())) });
            // Spectra's tool list never changes while it runs: the stream
            // stays open, quiet but for keep-alives, until the client closes it.
            sse(first.chain(stream::pending()).boxed())
        }
    }
}

fn sse(s: futures::stream::BoxStream<'static, Result<SseEvent, Infallible>>) -> Response {
    let mut r = Sse::new(s).keep_alive(KeepAlive::new().interval(Duration::from_secs(15)).text("")).into_response();
    r.headers_mut().insert("x-accel-buffering", "no".parse().unwrap());
    r
}

/// `_meta` on every result (spec §15.2): the session and the unread count;
/// the rules version arrives with the rules (#8).
pub async fn meta(ctx: &Ctx) -> Json {
    let mut m = serde_json::Map::new();
    if let Some(s) = &ctx.session {
        m.insert("spectra/session".into(), json!(s));
    }
    if let Ok(n) = spectra_core::conversation::unread(&ctx.daemon.ledger, &ctx.caller.principal.actor()).await {
        m.insert("spectra/inbox_unread".into(), json!(n));
    }
    Json::Object(m)
}

/// `POST /api/v1/ledger/events`: the owner's CLI hands over events it
/// signed over their payload, so `agent add` and `project add` work while
/// the daemon holds the ledger (spec §8.5, "One writer").
async fn owner_events(
    State(state): State<AppState>,
    ConnectInfo(peer): ConnectInfo<PeerInfo>,
    headers: HeaderMap,
    body: Bytes,
) -> Response {
    let caller = match authenticate(&state, peer, &headers, "POST /api/v1/ledger/events", &body).await {
        Ok(c) => c,
        Err(r) => return r,
    };
    if !matches!(caller.principal, Principal::Owner { .. }) {
        return (StatusCode::FORBIDDEN, axum::Json(json!({ "title": "only the owner hands events to the daemon" }))).into_response();
    }
    let events: Vec<WireEvent> = match serde_json::from_slice(&body) {
        Ok(v) => v,
        Err(e) => return (StatusCode::BAD_REQUEST, axum::Json(json!({ "title": format!("not a list of events: {e}") }))).into_response(),
    };
    match state.daemon.accept_owner_events(events).await {
        Ok(seqs) => axum::Json(json!({ "appended": seqs })).into_response(),
        Err(e) => (StatusCode::UNPROCESSABLE_ENTITY, axum::Json(json!({ "title": e.to_string() }))).into_response(),
    }
}

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1		//! Tuner over HTTP (spec §15.1, §8.5, §21.1): `POST /mcp` on the Unix
2		//! socket and the loopback port, every request signed and checked before
3		//! anything else; the peer's uid read from the socket; `Origin` checked
4		//! against DNS rebinding.
5
6		use crate::protocol::{self, Headers, Reply};
7		use crate::tools::Ctx;
8		use axum::body::Bytes;
9		use axum::extract::connect_info::{ConnectInfo, Connected};
10		use axum::extract::State;
11		use axum::http::{HeaderMap, StatusCode};
12		use axum::response::sse::{Event as SseEvent, KeepAlive, Sse};
13		use axum::response::{IntoResponse, Response};
14		use axum::routing::post;
15		use axum::Router;
16		use futures::stream::{self, StreamExt};
17		use serde_json::{json, Value as Json};
18		use spectra_core::authn::Caller;
19		use spectra_core::daemon::{Daemon, Peer, WireEvent};
20		use spectra_core::principals::Principal;
21		use spectra_core::proof::Proof;
22		use std::convert::Infallible;
23		use std::sync::Arc;
24		use std::time::Duration;
25
26		/// Who is on the other end of a connection: a Unix peer, or TCP.
27		#[derive(Clone, Copy, Debug)]
28		pub struct PeerInfo(pub Option<Peer>);
29
30		impl Connected<axum::serve::IncomingStream<'_, tokio::net::UnixListener>> for PeerInfo {
31	20×	fn connect_info(stream: axum::serve::IncomingStream<'_, tokio::net::UnixListener>) -> Self {
32	20×	let cred = stream.io().peer_cred().ok();
33	20×	PeerInfo(cred.map(\|c\| Peer { uid: c.uid(), pid: c.pid() }))
34	20×	}
35		}
36
37		impl Connected<axum::serve::IncomingStream<'_, tokio::net::TcpListener>> for PeerInfo {
38	0×	fn connect_info(_: axum::serve::IncomingStream<'_, tokio::net::TcpListener>) -> Self {
39	0×	PeerInfo(None)
40	0×	}
41		}
42
43		/// The app state: the daemon, and the origins a browser may send from.
44		#[derive(Clone)]
45		pub struct AppState {
46		pub daemon: Arc<Daemon>,
47		pub origins: Arc<Vec<String>>,
48		}
49
50		/// Tuner's routes; the binary adds the API and Radar beside them.
51	3×	pub fn router(state: AppState) -> Router {
52	3×	Router::new()
53	3×	.route("/mcp", post(mcp).get(not_allowed).delete(not_allowed))
54	3×	.route("/api/v1/ledger/events", post(owner_events))
55	3×	.with_state(state)
56	3×	}
57
58	1×	async fn not_allowed() -> StatusCode {
59	1×	StatusCode::METHOD_NOT_ALLOWED
60	1×	}
61
62		/// The proof the signature headers carry, for `method_path` and `body`.
63	13×	pub fn proof_from(headers: &HeaderMap, method_path: &str, body: &[u8]) -> Option<Proof> {
64	49×	let get = \|k: &str\| headers.get(k).and_then(\|v\| v.to_str().ok());
65	13×	let key = get("spectra-key")?;
66	12×	let time_ms = get("spectra-time")?.parse().ok()?;
67	12×	let nonce: [u8; 16] = hex::decode(get("spectra-nonce")?).ok()?.try_into().ok()?;
68	12×	let sig_bytes = hex::decode(get("spectra-signature")?).ok()?;
69	12×	let sig = oxy_core::cbor::decode(&sig_bytes).ok().and_then(\|v\| oxy_core::identity::Signature::from_value(&v).ok())?;
70	12×	if sig.key.to_hex() != key {
71	0×	return None;
72	12×	}
73	12×	Some(Proof { sig, method: method_path.into(), body_hash: *spectra_core::event::hash_body_plain(body), time_ms, nonce })
74	13×	}
75
76		/// Refuse a browser request from a page that is not ours (spec §21.1).
77	14×	pub fn origin_ok(headers: &HeaderMap, allowed: &[String]) -> bool {
78	14×	match headers.get("origin").and_then(\|v\| v.to_str().ok()) {
79	13×	None => true,
80	3×	Some(o) => allowed.iter().any(\|a\| a == o),
81		}
82	14×	}
83
84		/// Authenticate a request, or the response that refuses it.
85	14×	pub async fn authenticate(
86	14×	state: &AppState,
87	14×	peer: PeerInfo,
88	14×	headers: &HeaderMap,
89	14×	method_path: &str,
90	14×	body: &[u8],
91	14×	) -> Result<Caller, Response> {
92	14×	if !origin_ok(headers, &state.origins) {
93	1×	return Err((
94	1×	StatusCode::FORBIDDEN,
95	1×	axum::Json(protocol::error(&Json::Null, protocol::INVALID_REQUEST, "this origin may not call Spectra")),
96	1×	)
97	1×	.into_response());
98	13×	}
99	13×	let proof = proof_from(headers, method_path, body);
100	13×	state.daemon.authenticate(proof.as_ref(), method_path, body, peer.0).await.map_err(\|why\| {
101	3×	tracing::info!(%why, "refused a request");
102		// The reason concerns the caller's own key, so the caller is told it:
103		// an agent whose delegation expired must be able to say so.
104	3×	(
105	3×	StatusCode::UNAUTHORIZED,
106	3×	axum::Json(protocol::error(&Json::Null, protocol::UNAUTHENTICATED, &format!("not authenticated: {why}"))),
107	3×	)
108	3×	.into_response()
109	3×	})
110	14×	}
111
112	12×	async fn mcp(State(state): State<AppState>, ConnectInfo(peer): ConnectInfo<PeerInfo>, headers: HeaderMap, body: Bytes) -> Response {
113	12×	let caller = match authenticate(&state, peer, &headers, "POST /mcp", &body).await {
114	8×	Ok(c) => c,
115	4×	Err(r) => return r,
116		};
117	8×	let req: Json = match serde_json::from_slice(&body) {
118	8×	Ok(v) => v,
119	0×	Err(e) => {
120	0×	return (StatusCode::BAD_REQUEST, axum::Json(protocol::error(&Json::Null, protocol::PARSE_ERROR, &format!("not JSON: {e}"))))
121	0×	.into_response()
122		}
123		};
124	8×	let new_session = req.pointer("/params/arguments/new_session").and_then(Json::as_bool).unwrap_or(false)
125	0×	&& req.pointer("/params/name").and_then(Json::as_str) == Some("brief");
126	8×	let session = state.daemon.touch(&caller.principal, new_session).await;
127	8×	let h = Headers {
128	8×	version: headers.get("mcp-protocol-version").and_then(\|v\| v.to_str().ok()),
129	8×	method: headers.get("mcp-method").and_then(\|v\| v.to_str().ok()),
130	8×	name: headers.get("mcp-name").and_then(\|v\| v.to_str().ok()),
131		};
132	8×	let version = h.version.unwrap_or("2025-03-26").to_string();
133	8×	let ctx = Ctx { daemon: state.daemon.clone(), caller, session };
134	8×	let meta = meta(&ctx).await;
135	8×	match protocol::handle(&ctx, &h, req, meta.clone()).await {
136	7×	Reply::Json(status, v) => (StatusCode::from_u16(status).unwrap_or(StatusCode::OK), axum::Json(v)).into_response(),
137	1×	Reply::Accepted => StatusCode::ACCEPTED.into_response(),
138	0×	Reply::Stream(id, tool, args) => {
139	0×	let fut = async move {
140	0×	let out = (tool.run)(&ctx, args).await;
141	0×	let meta = crate::http::meta(&ctx).await;
142	0×	let msg = protocol::stream_result(&id, &version, &out, meta);
143	0×	Ok::<_, Infallible>(SseEvent::default().event("message").data(msg.to_string()))
144	0×	};
145	0×	sse(stream::once(fut).boxed())
146		}
147	0×	Reply::Listen(id, sub) => {
148	0×	let ack = json!({ "jsonrpc": "2.0", "method": "notifications/subscriptions/acknowledged", "params": { "_meta": { "io.modelcontextprotocol/subscriptionId": sub } } });
149	0×	let _ = id;
150	0×	let first = stream::once(async move { Ok::<_, Infallible>(SseEvent::default().event("message").data(ack.to_string())) });
151		// Spectra's tool list never changes while it runs: the stream
152		// stays open, quiet but for keep-alives, until the client closes it.
153	0×	sse(first.chain(stream::pending()).boxed())
154		}
155		}
156	12×	}
157
158	0×	fn sse(s: futures::stream::BoxStream<'static, Result<SseEvent, Infallible>>) -> Response {
159	0×	let mut r = Sse::new(s).keep_alive(KeepAlive::new().interval(Duration::from_secs(15)).text("")).into_response();
160	0×	r.headers_mut().insert("x-accel-buffering", "no".parse().unwrap());
161	0×	r
162	0×	}
163
164		/// `_meta` on every result (spec §15.2): the session and the unread count;
165		/// the rules version arrives with the rules (#8).
166	8×	pub async fn meta(ctx: &Ctx) -> Json {
167	8×	let mut m = serde_json::Map::new();
168	8×	if let Some(s) = &ctx.session {
169	8×	m.insert("spectra/session".into(), json!(s));
170	8×	}
171	8×	if let Ok(n) = spectra_core::conversation::unread(&ctx.daemon.ledger, &ctx.caller.principal.actor()).await {
172	8×	m.insert("spectra/inbox_unread".into(), json!(n));
173	8×	}
174	8×	Json::Object(m)
175	8×	}
176
177		/// `POST /api/v1/ledger/events`: the owner's CLI hands over events it
178		/// signed over their payload, so `agent add` and `project add` work while
179		/// the daemon holds the ledger (spec §8.5, "One writer").
180	2×	async fn owner_events(
181	2×	State(state): State<AppState>,
182	2×	ConnectInfo(peer): ConnectInfo<PeerInfo>,
183	2×	headers: HeaderMap,
184	2×	body: Bytes,
185	2×	) -> Response {
186	2×	let caller = match authenticate(&state, peer, &headers, "POST /api/v1/ledger/events", &body).await {
187	2×	Ok(c) => c,
188	0×	Err(r) => return r,
189		};
190	2×	if !matches!(caller.principal, Principal::Owner { .. }) {
191	0×	return (StatusCode::FORBIDDEN, axum::Json(json!({ "title": "only the owner hands events to the daemon" }))).into_response();
192	2×	}
193	2×	let events: Vec<WireEvent> = match serde_json::from_slice(&body) {
194	2×	Ok(v) => v,
195	0×	Err(e) => return (StatusCode::BAD_REQUEST, axum::Json(json!({ "title": format!("not a list of events: {e}") }))).into_response(),
196		};
197	2×	match state.daemon.accept_owner_events(events).await {
198	2×	Ok(seqs) => axum::Json(json!({ "appended": seqs })).into_response(),
199	0×	Err(e) => (StatusCode::UNPROCESSABLE_ENTITY, axum::Json(json!({ "title": e.to_string() }))).into_response(),
200		}
201	2×	}

Coverage / crates/spectra-mcp/src/http.rs 77.8%

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