koan_server/
mcp.rs

1//! MCP (Model Context Protocol) server for koan.
2//!
3//! Exposes the GraphQL schema as MCP tools for Claude Desktop / MCP clients.
4
5use std::sync::Arc;
6
7use crate::auth::AuthUser;
8use crossbeam_channel::Sender;
9use koan_core::player::commands::PlayerCommand;
10use koan_core::player::state::SharedPlayerState;
11use rmcp::handler::server::router::tool::ToolRouter;
12use rmcp::handler::server::wrapper::Json;
13use rmcp::model::{ServerCapabilities, ServerConfig};
14use rmcp::{ServerHandler, schemars, tool_router};
15use serde::{Deserialize, Serialize};
16
17// ---------------------------------------------------------------------------
18// Parameter types
19// ---------------------------------------------------------------------------
20
21#[derive(Debug, Deserialize, schemars::JsonSchema)]
22pub struct GraphqlParams {
23    #[schemars(
24        description = "GraphQL query or mutation string. Use the schema_sdl tool first to learn available types, queries, mutations, and filter parameters."
25    )]
26    pub query: String,
27    #[schemars(description = "Optional JSON object of query variables")]
28    pub variables: Option<serde_json::Value>,
29}
30
31// ---------------------------------------------------------------------------
32// Response types
33// ---------------------------------------------------------------------------
34
35/// GraphQL execution result wrapper — MCP spec requires outputSchema to be an object type.
36#[derive(Debug, Serialize, schemars::JsonSchema)]
37pub struct GraphqlResponse {
38    /// The GraphQL response JSON (contains data and/or errors fields).
39    pub result: serde_json::Value,
40}
41
42// ---------------------------------------------------------------------------
43// MCP Server
44// ---------------------------------------------------------------------------
45
46#[derive(Clone)]
47pub struct KoanMcpServer {
48    #[allow(dead_code)]
49    tool_router: ToolRouter<Self>,
50    graphql_schema: crate::graphql::KoanSchema,
51    /// A headless server: its own player is heard by nobody, and the music
52    /// plays on the devices linked to it.
53    headless: bool,
54    /// `sharing.public_url`, where an MCP client fetches koan's icon from.
55    public_url: Option<String>,
56}
57
58impl KoanMcpServer {
59    pub fn new(
60        state: Arc<SharedPlayerState>,
61        cmd_tx: Sender<PlayerCommand>,
62        pool: Arc<koan_core::db::pool::Pool>,
63    ) -> Self {
64        let graphql_schema = crate::graphql::build_schema_extended(state, cmd_tx, pool, Denylist);
65        Self {
66            tool_router: Self::tool_router(),
67            graphql_schema,
68            headless: false,
69            public_url: None,
70        }
71    }
72
73    /// Who a request acts as: the account `bearer_gate` found its token for,
74    /// at most at `capped` role; on stdio, the local user at `mcp_role()`.
75    fn caller(&self, extensions: &rmcp::model::Extensions) -> AuthUser {
76        extensions
77            .get::<axum::http::request::Parts>()
78            .and_then(|p| p.extensions.get::<AuthUser>())
79            .map(|u| AuthUser {
80                role: capped(u.role),
81                ..u.clone()
82            })
83            .unwrap_or_else(|| AuthUser {
84                user_id: koan_core::db::queries::LOCAL_USER,
85                role: mcp_role(),
86                ..AuthUser::anonymous_admin()
87            })
88    }
89}
90
91use rmcp::handler::server::wrapper::Parameters;
92use rmcp::tool;
93
94/// Role the MCP `graphql` tool executes at.
95///
96/// The transport carries no credential, so anything reachable here is reachable
97/// by whoever can talk to the MCP process. `User` covers everything the tool
98/// advertises — browsing, playback, queue, favourites, playlists — and
99/// leaves out the admin mutations that move files on disk (`organize*`), rewrite
100/// config, or change the output device. `KOAN_MCP_ADMIN=1` opts back in.
101fn mcp_role() -> koan_core::auth::Role {
102    if std::env::var("KOAN_MCP_ADMIN").is_ok_and(|v| v == "1") {
103        koan_core::auth::Role::Admin
104    } else {
105        koan_core::auth::Role::User
106    }
107}
108
109/// Mutations the MCP never runs, whoever is calling and at whatever role,
110/// `KOAN_MCP_ADMIN` included: everything that moves or rewrites files on disk,
111/// and the config that says where the library is. A model that has been
112/// misled, or is simply wrong, can then lose nobody any music. GraphQL itself
113/// still offers them to an admin.
114pub const DENIED_MUTATIONS: &[&str] = &["organizeExecute", "organizeUndo", "updateConfig"];
115
116/// Refuses `DENIED_MUTATIONS` as they resolve, so no alias, fragment or
117/// variable spelling of the query gets past it.
118struct Denylist;
119
120impl async_graphql::extensions::ExtensionFactory for Denylist {
121    fn create(&self) -> Arc<dyn async_graphql::extensions::Extension> {
122        Arc::new(Denylist)
123    }
124}
125
126#[async_trait::async_trait]
127impl async_graphql::extensions::Extension for Denylist {
128    async fn resolve(
129        &self,
130        ctx: &async_graphql::extensions::ExtensionContext<'_>,
131        info: async_graphql::extensions::ResolveInfo<'_>,
132        next: async_graphql::extensions::NextResolve<'_>,
133    ) -> async_graphql::ServerResult<Option<async_graphql::Value>> {
134        if info.parent_type == "MutationRoot" && DENIED_MUTATIONS.contains(&info.name) {
135            return Err(async_graphql::ServerError::new(
136                format!("{} is not available through MCP", info.name),
137                None,
138            ));
139        }
140        next.run(ctx, info).await
141    }
142}
143
144/// The role an account acts at through the MCP: its own, but no higher than
145/// `mcp_role()`. Track titles, tags and share descriptions reach the model, and
146/// any of them may carry an instruction; capped, an admin account's model
147/// cannot be talked into moving files or rewriting config.
148pub fn capped(role: koan_core::auth::Role) -> koan_core::auth::Role {
149    use koan_core::auth::Role;
150    match (role, mcp_role()) {
151        (Role::Admin, Role::User) => Role::User,
152        (role, _) => role,
153    }
154}
155
156#[tool_router]
157impl KoanMcpServer {
158    #[tool(
159        description = "The GraphQL schema for the user's music (kōan): their library and the \
160        players they listen on. Call this first, before `graphql`. It covers playing, pausing, \
161        skipping and queueing music on the user's phone and computers, what is playing now, \
162        and searching, browsing and making playlists from the music they own."
163    )]
164    fn schema_sdl(&self) -> Json<GraphqlResponse> {
165        let sdl = self.graphql_schema.sdl();
166        Json(GraphqlResponse {
167            result: serde_json::Value::String(sdl),
168        })
169    }
170
171    #[tool(
172        description = "Control the user's music and search their music library (kōan). Use it \
173        for any request about music they listen to or own: play something, pause, resume, skip, \
174        what's playing, what's next, add to or change the queue, find or recommend from their \
175        collection, playlists, favourites. \"Pause the music on my desktop\", \"play some \
176        jazz on my phone\" and \"what is this song\" are all this tool.\n\n\
177        Call schema_sdl first for the full schema. The user's phones and computers running \
178        kōan are `clients`; commands for them end in `OnClient`.\n\n\
179        Examples:\n\
180        - What's playing, where: { clients { name playing nowPlaying positionMs } }\n\
181        - Pause: mutation { controlClient(action: PAUSE) { ok message } }\n\
182        - Find music: { tracks(search: \"aphex\", first: 20) { edges { node { id title artist album } } } }\n\
183        - Play it: mutation { playOnClient(trackIds: [\"42\", \"43\"]) { ok message } }\n\n\
184        String filters are case-insensitive substrings."
185    )]
186    async fn graphql(
187        &self,
188        Parameters(params): Parameters<GraphqlParams>,
189        extensions: rmcp::model::Extensions,
190    ) -> Json<GraphqlResponse> {
191        let caller = self.caller(&extensions);
192        let result = crate::graphql::execute_in_process(
193            &self.graphql_schema,
194            &params.query,
195            params.variables,
196            caller,
197        )
198        .await;
199        Json(GraphqlResponse { result })
200    }
201}
202
203impl KoanMcpServer {
204    /// Who this server is to a client, with the icon a client shows beside it.
205    /// Without an icon, clients guess from the domain and find its parent's.
206    fn implementation(&self) -> rmcp::model::Implementation {
207        let info =
208            rmcp::model::Implementation::new("koan", env!("CARGO_PKG_VERSION")).with_title("kōan");
209        match self.public_url.as_deref().map(|u| u.trim_end_matches('/')) {
210            Some(base) => info.with_website_url(base).with_icons(vec![
211                rmcp::model::Icon::new(format!("{base}/ui/assets/icon-192.png"))
212                    .with_mime_type("image/png")
213                    .with_sizes(vec!["192x192".into()]),
214            ]),
215            None => info,
216        }
217    }
218}
219
220#[rmcp::tool_handler]
221impl ServerHandler for KoanMcpServer {
222    fn get_info(&self) -> ServerConfig {
223        // Over HTTP this is a server: its own player is headless and nobody
224        // hears it, and what the user listens to is the apps linked to it. On
225        // stdio it is the user's own machine, and its player is the music.
226        let instructions = if self.headless {
227            SERVER_INSTRUCTIONS
228        } else {
229            LOCAL_INSTRUCTIONS
230        };
231        ServerConfig::new(ServerCapabilities::builder().enable_tools().build())
232            .with_server_info(self.implementation())
233            .with_instructions(instructions)
234    }
235}
236
237/// How to choose music by style. Shared by both instruction sets: genre tags are
238/// sparse wherever the library lives.
239macro_rules! choosing_by_style {
240    () => {
241        "- **Choosing music by style, mood or era** (\"psychedelic rock\", \"something for a rainy \
242Sunday\"): genre tags are sparse and inconsistent, so do not rely on `genre` filters. Use your \
243own knowledge, and research when unsure, to list many artists and albums that fit, then look \
244them all up in a single query with aliases (`a: artists(search: \"Can\") { … } b: …`) and \
245choose from the ones present. `search` matches any part of a name, ignoring case, so check that \
246a result is the artist you meant. If most are missing, read the library's artist names once \
247(`artists(first: 500, sortBy: TRACK_COUNT, sortDir: DESC) { edges { node { id name } } \
248pageInfo { hasNextPage endCursor } }`, then `after: endCursor` while `hasNextPage`) and pick \
249from them by what you know of each. Do not guess names one round at a time.
250"
251    };
252}
253
254const SERVER_INSTRUCTIONS: &str = concat!("kōan is the user's music: their whole music library, and the \
255phones and computers they listen on. Use it for anything about music they are playing or own — \
256\"pause the music\", \"play something like Polar Bear on my phone\", \"what's this song\", \
257\"skip to the Phace remix\", \"add their new album when it's downloaded\". Call `schema_sdl` \
258once, then do everything through `graphql`.
259
260## Where the music plays
261The user listens in kōan apps on their devices, linked to this server. Query \
262`clients { name platform playing nowPlaying album positionMs durationMs queue { trackId \
263title artist current } }` to see each device, what it is playing and what it has queued. Every \
264command about the user's music goes to a device:
265- `controlClient(action: PAUSE|RESUME|NEXT|PREVIOUS)`, `seekOnClient(positionMs)`
266- `setPlayModeOnClient(shuffle, repeat: OFF|QUEUE|ONE)`: shuffle reorders the rest of the device's queue, and turning it off puts the queue back; `clients { shuffle repeat }` reports each device's modes
267- `setSleepTimerOnClient(minutes)` or `setSleepTimerOnClient(endOf: TRACK|RECORD)` (\"stop the music in 30 minutes\", \"after this album\"): it fades out and pauses, the queue kept; `cancelSleepTimerOnClient`; `clients { sleep { remainingMs endOf } }` shows what is set
268- `playOnClient(trackIds, startAt)` replaces the queue and plays; `enqueue: true` appends. \
269A phone iOS has suspended is not linked but is still reached. Music comes up there as a \
270notification to tap, since iOS lets no app start audio on its own from sleep; queue and \
271other changes are applied as it wakes. The message says when a device was asleep: tell the user \
272to tap the notification
273- `playNextOnClient(trackIds)`, `jumpOnClient(trackId)` (skip to a track, queued or not), \
274`removeFromClient(trackIds)`, `clearClient`, `syncClient`
275- **Making a playlist the user asked for** (\"make me a cyberpunk playlist\"): research what \
276fits, find each track in the library, `createPlaylist` with those in order. For picks the \
277library lacks, fetch the album with slsk's `grab`, then `addToPlaylistWhenAdded(playlistId, \
278artist, album, titles)` to add the wanted tracks once it is imported. Tell the user what is \
279there now and what is on its way.
280- Playlists made or edited here (`createPlaylist`, `setPlaylistTracks`…) reach every device \
281by themselves: linked ones sync at once, others when next opened. `syncClients` does the same \
282on request.
283- `evictOnClients(trackIds)` makes every linked device drop its downloaded copies of those \
284tracks: when a track plays as noise or glitches, after the file on the server is replaced
285- `queueOnClientWhenAdded(artist, album)` queues an album once it reaches the library, e.g. \
286one being downloaded with slsk's `grab`; `clientOrders` lists those waiting
287Leave `client` out unless the user named a device (\"my phone\", \"the desktop\": match it \
288against `clients` names and platforms). Without it the server picks the device that is \
289playing, else the one played most recently; if it answers that it cannot tell, ask the user \
290which device.
291
292**Act on what the user asks; do not second-guess it from reported state.** \"Pause\", \
293\"skip\" and \"resume\" go straight to `controlClient`: the user can hear the device and you \
294cannot, and a report can be stale or, from an older app (`playing: null`), absent.
295
296**Never use the server's own player for the user's music.** `play`, `pause`, `resume`, \
297`next`, `previous`, `seek`, `nowPlaying`, `queue`, `addToQueue`, `replaceQueue`, \
298and `playPlaylist` drive a headless player on the server that nobody \
299hears; `nowPlaying` there reports nothing about what the user is listening to.
300
301## The library
302- `artists`, `albums`, `tracks` with filters (genre, year range, codec, sample rate, bit depth, \
303duration, favourites), `randomTracks`, `fuzzySearch`
304",
305    choosing_by_style!(),
306    "- Build a set from these, then send its track ids to a device with `playOnClient`. Track ids are \
307integers in queries; pass them to the client mutations as strings.
308- Favourites: `favourite`, `unfavourite`, `toggleFavourite`, `favouritesOnly: true` on queries
309- Playlists: `playlists`, `playlistTracks`, `createPlaylist`, `addToPlaylist`, \
310`setPlaylistTracks`, `renamePlaylist`, `deletePlaylist`
311- Smart playlists stay up to date by themselves (\"what I played most last month\", \
312\"favourites I have not heard in a while\"): `createSmartPlaylist(name, rules)` and \
313`setPlaylistRules`; the rule format is in the schema's description of `createSmartPlaylist`. \
314Their contents cannot be edited (`readonly`); change the rules instead.
315- History: `playHistory`
316- Sharing: `createShare(trackIds, description)` makes a public link anyone can open without an \
317account; confirm with the user first. `shares`, `updateShare`, `deleteShare` manage them.
318
319## Not available
320`organizeExecute`, `organizeUndo` (move files on disk) and `updateConfig` are never run \
321through MCP. Other admin mutations (`triggerScan`, user management) are refused unless \
322`KOAN_MCP_ADMIN=1` is set.");
323
324const LOCAL_INSTRUCTIONS: &str = concat!(
325    "kōan is the user's music player on this machine and their \
326music library. Use it for anything about music they are playing or own — \"pause the music\", \
327\"play something like Polar Bear\", \"what's this song\". Call `schema_sdl` once, then do \
328everything through `graphql`.
329
330## Playback
331This player is what the user hears: `play`, `pause`, `resume`, `stop`, `next`, `previous`, \
332`seek`, `nowPlaying`; the queue with `queue`, `addToQueue`, `replaceQueue`, `removeFromQueue`, \
333`moveInQueue`, `clearQueue`, `undo`, `redo`.
334
335## The library
336- `artists`, `albums`, `tracks` with filters (genre, year range, codec, sample rate, bit depth, \
337duration, favourites), `randomTracks`, `fuzzySearch`
338",
339    choosing_by_style!(),
340    "- Favourites: `favourite`, `unfavourite`, `toggleFavourite`, `favouritesOnly: true` on queries
341- Playlists: `playlists`, `playlistTracks`, `createPlaylist`, `saveQueueAsPlaylist`, \
342`addToPlaylist`, `setPlaylistTracks`, `renamePlaylist`, `deletePlaylist`, `playPlaylist`; \
343`createSmartPlaylist(name, rules)` and `setPlaylistRules` for ones that stay up to date by \
344themselves (rule format in the schema)
345- History: `playHistory`
346- Sharing: `createShare(trackIds, description)` makes a public link; confirm with the user first.
347
348## Not available
349`organizeExecute`, `organizeUndo` (move files on disk) and `updateConfig` are never run \
350through MCP. `triggerScan` and `setDevice` are refused unless `KOAN_MCP_ADMIN=1` is set.
351
352## IDs
353Track IDs are integers from the library; queue item IDs are UUIDs from the queue."
354);
355
356const MAX_BODY: usize = 1024 * 1024;
357/// Open event streams count against it, so it allows a few clients each with
358/// a stream and requests in flight.
359const MAX_CONCURRENT: usize = 64;
360
361/// `/mcp` on the main port, for clients holding a token from koan's own OAuth
362/// (`ui::oauth`). Each request acts as the account its token names, at that
363/// account's role.
364pub fn router(
365    state: Arc<SharedPlayerState>,
366    cmd_tx: Sender<PlayerCommand>,
367    auth: crate::auth::middleware::AuthState,
368    public_url: Option<String>,
369    headless: bool,
370    shutdown: tokio_util::sync::CancellationToken,
371) -> axum::Router {
372    use rmcp::transport::streamable_http_server::{
373        StreamableHttpServerConfig, StreamableHttpService, session::local::LocalSessionManager,
374    };
375    let mut template = KoanMcpServer::new(state, cmd_tx, auth.pool.clone());
376    template.headless = headless;
377    template.public_url = public_url.clone();
378    let service = StreamableHttpService::new(
379        move || Ok(template.clone()),
380        Arc::new(LocalSessionManager::default()),
381        // The main app's Host guard has already checked the Host. Cancelled at
382        // shutdown, so open event streams end rather than hold it up.
383        StreamableHttpServerConfig::default()
384            .disable_allowed_hosts()
385            .with_cancellation_token(shutdown),
386    );
387    // No request timeout: a session's GET is an event stream that stays open.
388    axum::Router::new()
389        .nest_service("/mcp", service)
390        .layer(tower_http::catch_panic::CatchPanicLayer::new())
391        .layer(tower_http::limit::RequestBodyLimitLayer::new(MAX_BODY))
392        .layer(axum::middleware::from_fn_with_state(
393            (auth, public_url),
394            bearer_gate,
395        ))
396        .layer(
397            tower::ServiceBuilder::new()
398                .layer(axum::error_handling::HandleErrorLayer::new(
399                    |_: tower::BoxError| async {
400                        (axum::http::StatusCode::SERVICE_UNAVAILABLE, "busy")
401                    },
402                ))
403                .load_shed()
404                .concurrency_limit(MAX_CONCURRENT),
405        )
406}
407
408/// Let a request with a valid access token through as its account. Without
409/// one, the 401 names the resource metadata, which is how a client finds where
410/// to sign in.
411async fn bearer_gate(
412    axum::extract::State((auth, public_url)): axum::extract::State<(
413        crate::auth::middleware::AuthState,
414        Option<String>,
415    )>,
416    mut req: axum::extract::Request,
417    next: axum::middleware::Next,
418) -> axum::response::Response {
419    use axum::http::{Method, StatusCode, header};
420    use axum::response::IntoResponse;
421    // Someone who pasted the address into a browser: show them what it is for.
422    let browser = req.method() == Method::GET
423        && !req.headers().contains_key(header::AUTHORIZATION)
424        && req
425            .headers()
426            .get(header::ACCEPT)
427            .and_then(|v| v.to_str().ok())
428            .is_some_and(|a| a.contains("text/html"));
429    if browser {
430        return axum::response::Redirect::to("/connect").into_response();
431    }
432    let user = if auth.auth_enabled {
433        let token = req
434            .headers()
435            .get(header::AUTHORIZATION)
436            .and_then(|v| v.to_str().ok())
437            .and_then(|v| v.strip_prefix("Bearer "))
438            .and_then(|t| {
439                koan_core::auth::validate_scoped_token(
440                    &auth.public_pem,
441                    t,
442                    Some(koan_core::auth::MCP_SCOPE),
443                )
444                .ok()
445            });
446        match token {
447            Some(claims) => crate::auth::current_user(&auth.pool, claims).await,
448            None => None,
449        }
450    } else {
451        Some(AuthUser::anonymous_admin())
452    };
453    match user {
454        Some(user) => {
455            req.extensions_mut().insert(user);
456            next.run(req).await
457        }
458        None => {
459            // Without `public_url` there is no OAuth to point the client at.
460            let challenge = match public_url.as_deref().map(|u| u.trim_end_matches('/')) {
461                Some(base) => format!(
462                    "Bearer resource_metadata=\"{base}{}\"",
463                    crate::ui::RESOURCE_METADATA
464                ),
465                None => "Bearer".to_owned(),
466            };
467            (
468                StatusCode::UNAUTHORIZED,
469                [(header::WWW_AUTHENTICATE, challenge)],
470                "sign in to kōan",
471            )
472                .into_response()
473        }
474    }
475}
476
477/// Entry point for `koan mcp` — starts a headless player with an MCP server on stdio.
478pub fn cmd_mcp() {
479    use koan_core::player::Player;
480    use rmcp::ServiceExt;
481
482    // Validate DB is accessible before starting the server.
483    let _db = koan_core::db::connection::Database::open_default().expect("failed to open database");
484    let db_path = koan_core::config::db_path();
485
486    // Spawn the player engine (headless — no TUI).
487    let (state, _timeline, _viz, cmd_tx) = Player::spawn();
488
489    let pool = Arc::new(koan_core::db::pool::Pool::new(db_path));
490    let server = KoanMcpServer::new(state, cmd_tx, pool);
491
492    // Run the MCP server on the tokio runtime (blocking the main thread).
493    let rt = tokio::runtime::Runtime::new().expect("failed to create tokio runtime");
494    rt.block_on(async {
495        let transport = rmcp::transport::io::stdio();
496        let service = server
497            .serve(transport)
498            .await
499            .expect("failed to start MCP server");
500        let _ = service.waiting().await;
501    });
502}
503
504// ---------------------------------------------------------------------------
505// Tests
506// ---------------------------------------------------------------------------
507
508#[cfg(test)]
509mod tests {
510    use super::*;
511    use koan_core::db::connection::Database;
512    use koan_core::db::queries;
513    use koan_core::player::commands::CommandChannel;
514    use tempfile::TempDir;
515
516    fn test_server() -> (KoanMcpServer, CommandChannel, TempDir) {
517        let tmp = TempDir::new().unwrap();
518        let db_path = tmp.path().join("test.db");
519        let db = Database::open(&db_path).unwrap();
520        koan_core::db::schema::create_tables(&db.conn).unwrap();
521
522        let state = SharedPlayerState::new();
523        let ch = CommandChannel::new();
524        let tx = ch.tx.clone();
525
526        let server =
527            KoanMcpServer::new(state, tx, Arc::new(koan_core::db::pool::Pool::new(db_path)));
528        (server, ch, tmp)
529    }
530
531    fn as_user(user: AuthUser) -> rmcp::model::Extensions {
532        let (mut parts, ()) = axum::http::Request::new(()).into_parts();
533        parts.extensions.insert(user);
534        let mut ext = rmcp::model::Extensions::new();
535        ext.insert(parts);
536        ext
537    }
538
539    #[test]
540    fn a_token_acts_as_its_account_with_admin_capped() {
541        use koan_core::auth::Role;
542        let (server, _ch, _tmp) = test_server();
543        let user = |role| AuthUser {
544            user_id: 7,
545            username: "mate".into(),
546            role,
547        };
548        let c = server.caller(&as_user(user(Role::Admin)));
549        assert_eq!((c.user_id, c.username.as_str()), (7, "mate"));
550        assert_eq!(c.role, capped(Role::Admin));
551        assert_eq!(
552            server.caller(&as_user(user(Role::Readonly))).role,
553            Role::Readonly
554        );
555        // stdio: the local user, at the transport's default role.
556        let local = server.caller(&Default::default());
557        assert_eq!(
558            (local.user_id, local.role),
559            (queries::LOCAL_USER, mcp_role())
560        );
561    }
562
563    #[tokio::test]
564    async fn a_browser_opening_mcp_is_shown_how_to_connect() {
565        use tower::ServiceExt as _;
566        let (_server, ch, tmp) = test_server();
567        let auth = crate::auth::middleware::AuthState {
568            public_pem: Arc::new(Vec::new()),
569            auth_enabled: true,
570            introspection_key: None,
571            pool: Arc::new(koan_core::db::pool::Pool::new(tmp.path().join("test.db"))),
572        };
573        let app = router(
574            SharedPlayerState::new(),
575            ch.tx.clone(),
576            auth,
577            None,
578            true,
579            Default::default(),
580        );
581        let req = |accept: &str| {
582            axum::http::Request::get("/mcp")
583                .header(axum::http::header::ACCEPT, accept)
584                .body(axum::body::Body::empty())
585                .unwrap()
586        };
587        let r = app.clone().oneshot(req("text/html,*/*")).await.unwrap();
588        assert_eq!(r.headers()[axum::http::header::LOCATION], "/connect");
589        let r = app.oneshot(req("text/event-stream")).await.unwrap();
590        assert_eq!(r.status(), axum::http::StatusCode::UNAUTHORIZED);
591    }
592
593    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
594    async fn mutations_that_touch_files_are_refused_whoever_asks() {
595        use koan_core::auth::Role;
596        let (server, _ch, _tmp) = test_server();
597        let admin = as_user(AuthUser {
598            user_id: 1,
599            username: "owner".into(),
600            role: Role::Admin,
601        });
602        let Json(resp) = server
603            .graphql(
604                Parameters(GraphqlParams {
605                    query: "mutation { undo: organizeUndo { ok } }".into(),
606                    variables: None,
607                }),
608                admin,
609            )
610            .await;
611        let errors = resp.result["errors"].to_string();
612        assert!(errors.contains("not available through MCP"), "{errors}");
613    }
614
615    #[test]
616    fn a_server_with_an_address_names_its_icon() {
617        let (mut server, _ch, _tmp) = test_server();
618        assert!(server.get_info().server_info.icons.is_none());
619        server.public_url = Some("https://koan.test/".into());
620        let icons = server.get_info().server_info.icons.unwrap();
621        assert_eq!(icons[0].src, "https://koan.test/ui/assets/icon-192.png");
622    }
623
624    fn insert_test_track(db_path: &std::path::Path, title: &str, artist: &str, album: &str) -> i64 {
625        let db = Database::open(db_path).unwrap();
626        let meta = queries::TrackMeta {
627            title: title.to_string(),
628            artist: artist.to_string(),
629            album_artist: Some(artist.to_string()),
630            album: album.to_string(),
631            track_number: Some(1),
632            disc: Some(1),
633            date: Some("2024".into()),
634            genre: Some("Electronic".into()),
635            duration_ms: Some(240000),
636            path: Some(format!(
637                "/tmp/test/{}.flac",
638                title.to_lowercase().replace(' ', "_")
639            )),
640            codec: Some("FLAC".into()),
641            sample_rate: Some(44100),
642            bit_depth: Some(16),
643            channels: Some(2),
644            bitrate: Some(1411),
645            size_bytes: Some(42_000_000),
646            mtime: Some(1700000000),
647            source: "local".into(),
648            remote_id: None,
649            remote_url: None,
650            album_remote_id: None,
651            artist_remote_id: None,
652            mbid: None,
653            album_mbid: None,
654            album_added_at: None,
655            label: None,
656        };
657        queries::upsert_track(&db.conn, &meta).unwrap()
658    }
659
660    #[test]
661    fn schema_sdl_returns_schema() {
662        let (server, _ch, _tmp) = test_server();
663        let Json(resp) = server.schema_sdl();
664        let sdl = resp.result.as_str().unwrap();
665        assert!(sdl.contains("type QueryRoot"));
666        assert!(sdl.contains("type MutationRoot"));
667        assert!(sdl.contains("artists"));
668        assert!(sdl.contains("nowPlaying"));
669    }
670
671    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
672    async fn graphql_query_works() {
673        let (server, _ch, tmp) = test_server();
674        let db_path = tmp.path().join("test.db");
675        insert_test_track(&db_path, "Windowlicker", "Aphex Twin", "Windowlicker EP");
676
677        let result = server
678            .graphql(
679                Parameters(GraphqlParams {
680                    query: r#"{ tracks(search: "aphex") { edges { node { title artist } } } }"#
681                        .into(),
682                    variables: None,
683                }),
684                Default::default(),
685            )
686            .await;
687        let Json(resp) = result;
688        let data = &resp.result["data"]["tracks"]["edges"];
689        assert_eq!(data.as_array().unwrap().len(), 1);
690        assert_eq!(data[0]["node"]["title"], "Windowlicker");
691    }
692
693    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
694    async fn graphql_mutation_works() {
695        let (server, _ch, _tmp) = test_server();
696        let result = server
697            .graphql(
698                Parameters(GraphqlParams {
699                    query: "mutation { pause { ok message } }".into(),
700                    variables: None,
701                }),
702                Default::default(),
703            )
704            .await;
705        let Json(resp) = result;
706        assert_eq!(resp.result["data"]["pause"]["ok"], true);
707    }
708
709    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
710    async fn graphql_now_playing_stopped() {
711        let (server, _ch, _tmp) = test_server();
712        let result = server
713            .graphql(
714                Parameters(GraphqlParams {
715                    query: "{ nowPlaying { state positionMs } }".into(),
716                    variables: None,
717                }),
718                Default::default(),
719            )
720            .await;
721        let Json(resp) = result;
722        assert_eq!(resp.result["data"]["nowPlaying"]["state"], "STOPPED");
723    }
724
725    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
726    async fn graphql_library_stats() {
727        let (server, _ch, tmp) = test_server();
728        let db_path = tmp.path().join("test.db");
729        insert_test_track(&db_path, "T1", "A1", "Album1");
730
731        let result = server
732            .graphql(
733                Parameters(GraphqlParams {
734                    query: "{ libraryStats { totalTracks totalArtists totalAlbums } }".into(),
735                    variables: None,
736                }),
737                Default::default(),
738            )
739            .await;
740        let Json(resp) = result;
741        assert_eq!(resp.result["data"]["libraryStats"]["totalTracks"], 1);
742    }
743}
koan_server/mcp.rs

koan_server/
mcp.rs
