feat(webapi): impl room member listing

blah-types/src/msg.rs

@@ -376,9 +376,10 @@ bitflags::bitflags! {
         const POST_CHAT = 1 << 0;
         const ADD_MEMBER = 1 << 1;
         const DELETE_ROOM = 1 << 2;
+        const LIST_MEMBERS = 1 << 3;
 
         const MAX_SELF_ADD = Self::POST_CHAT.bits();
-        const MAX_PEER_CHAT = Self::POST_CHAT.bits() | Self::DELETE_ROOM.bits();
+        const MAX_PEER_CHAT = Self::POST_CHAT.bits() | Self::DELETE_ROOM.bits() | Self::LIST_MEMBERS.bits();
 
         const ALL = !0;
     }

blahd/src/database.rs

@@ -242,19 +242,26 @@ pub trait TransactionOps {
         .ok_or(ApiError::RoomNotFound)
     }
 
-    // FIXME: Eliminate this.
+    fn list_room_members(
-    // Currently broadcasting msgs requires traversing over all members.
+        &self,
-    fn list_room_members(&self, rid: Id) -> Result<Vec<i64>> {
+        rid: Id,
+        start_uid: Id,
+        page_len: Option<NonZero<u32>>,
+    ) -> Result<Vec<(i64, PubKey, MemberPermission, Id)>> {
+        let page_len = page_len.map_or(-1i64, |v| v.get().into());
         prepare_cached_and_bind!(
             self.conn(),
             r"
-            SELECT `uid`
+            SELECT `uid`, `id_key`, `room_member`.`permission`, `last_seen_cid`
             FROM `room_member`
-            WHERE `rid` = :rid
+            JOIN `user` USING (`uid`)
+            WHERE `rid` = :rid AND
+                `uid` > :start_uid
+            LIMIT :page_len
             "
         )
         .raw_query()
-        .mapped(|row| row.get::<_, i64>(0))
+        .mapped(|row| Ok((row.get(0)?, row.get(1)?, row.get(2)?, row.get(3)?)))
         .collect::<rusqlite::Result<Vec<_>>>()
         .map_err(Into::into)
     }

blahd/src/lib.rs

@@ -17,7 +17,7 @@ use blah_types::msg::{
     SignedChatMsgWithId, UserRegisterPayload,
 };
 use blah_types::server::{RoomMetadata, ServerCapabilities, ServerMetadata, UserRegisterChallenge};
-use blah_types::{get_timestamp, Id, Signed, UserKey};
+use blah_types::{get_timestamp, Id, PubKey, Signed, UserKey};
 use data_encoding::BASE64_NOPAD;
 use database::{Transaction, TransactionOps};
 use feed::FeedData;
@@ -159,6 +159,7 @@ pub fn router(st: Arc<AppState>) -> Router {
         .route("/room/:rid/msg", get(room_msg_list).post(room_msg_post))
         .route("/room/:rid/msg/:cid/seen", post(room_msg_mark_seen))
         .route("/room/:rid/admin", post(room_admin))
+        .route("/room/:rid/member", get(room_member_list))
         .layer(tower_http::limit::RequestBodyLimitLayer::new(
             st.config.max_request_len,
         ))
@@ -554,7 +555,11 @@ async fn room_msg_post(
 
         let cid = Id::gen();
         txn.add_room_chat_msg(rid, uid, cid, &chat)?;
-        let members = txn.list_room_members(rid)?;
+        let members = txn
+            .list_room_members(rid, Id::MIN, None)?
+            .into_iter()
+            .map(|(uid, ..)| uid)
+            .collect::<Vec<_>>();
         Ok((cid, members))
     })?;
 
@@ -668,3 +673,64 @@ async fn room_msg_mark_seen(
     })?;
     Ok(StatusCode::NO_CONTENT)
 }
+
+// TODO: Hoist these into types crate.
+#[derive(Debug, Default, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct RoomMemberList {
+    pub members: Vec<RoomMember>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub skip_token: Option<Id>,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct RoomMember {
+    pub id_key: PubKey,
+    pub permission: MemberPermission,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub last_seen_cid: Option<Id>,
+}
+
+async fn room_member_list(
+    st: ArcState,
+    R(Path(rid), _): RE<Path<Id>>,
+    R(Query(pagination), _): RE<Query<Pagination>>,
+    Auth(user): Auth,
+) -> Result<Json<RoomMemberList>, ApiError> {
+    api_ensure!(
+        pagination.until_token.is_none(),
+        "untilToken is not supported for this API"
+    );
+
+    st.db.with_read(|txn| {
+        let (_, perm, _) = txn.get_room_member(rid, &user)?;
+        api_ensure!(
+            perm.contains(MemberPermission::LIST_MEMBERS),
+            ApiError::PermissionDenied("the user does not have permission to get room members"),
+        );
+
+        let page_len = pagination.effective_page_len(&st);
+        let mut last_uid = None;
+        let members = txn
+            .list_room_members(
+                rid,
+                pagination.skip_token.unwrap_or(Id::MIN),
+                Some(page_len),
+            )?
+            .into_iter()
+            .map(|(uid, id_key, permission, last_seen_cid)| {
+                last_uid = Some(Id(uid));
+                RoomMember {
+                    id_key,
+                    permission,
+                    last_seen_cid: (last_seen_cid != Id(0)).then_some(last_seen_cid),
+                }
+            })
+            .collect::<Vec<_>>();
+        let skip_token = (members.len() as u32 == page_len.get())
+            .then(|| last_uid.expect("page must not be empty"));
+        Ok(Json(RoomMemberList {
+            members,
+            skip_token,
+        }))
+    })
+}

blahd/tests/webapi.rs

@@ -17,7 +17,7 @@ use blah_types::msg::{
 };
 use blah_types::server::{RoomMetadata, ServerMetadata, UserRegisterChallenge};
 use blah_types::{Id, SignExt, Signed, UserKey};
-use blahd::{AppState, Database, RoomList, RoomMsgs};
+use blahd::{AppState, Database, RoomList, RoomMember, RoomMemberList, RoomMsgs};
 use ed25519_dalek::SigningKey;
 use expect_test::expect;
 use futures_util::future::BoxFuture;
@@ -1566,3 +1566,61 @@ async fn event(server: Server) {
         assert_eq!(got2, WsEvent::Msg(chat.msg));
     }
 }
+
+#[rstest]
+#[tokio::test]
+async fn room_member(server: Server) {
+    let rid = server
+        .create_room(
+            &ALICE,
+            RoomAttrs::PUBLIC_READABLE | RoomAttrs::PUBLIC_JOINABLE,
+            "public",
+        )
+        .await
+        .unwrap();
+
+    // Authentication is required.
+    server
+        .get::<RoomMemberList>(&format!("/room/{rid}/member"), None)
+        .await
+        .expect_api_err(StatusCode::UNAUTHORIZED, "unauthorized");
+
+    // Not a room member.
+    server
+        .get::<RoomMemberList>(&format!("/room/{rid}/member"), Some(&auth(&BOB)))
+        .await
+        .expect_api_err(StatusCode::NOT_FOUND, "room_not_found");
+
+    server
+        .join_room(rid, &BOB, MemberPermission::POST_CHAT)
+        .await
+        .unwrap();
+
+    // No permission.
+    server
+        .get::<RoomMemberList>(&format!("/room/{rid}/member"), Some(&auth(&BOB)))
+        .await
+        .expect_api_err(StatusCode::FORBIDDEN, "permission_denied");
+
+    // OK.
+    let got = server
+        .get::<RoomMemberList>(&format!("/room/{rid}/member"), Some(&auth(&ALICE)))
+        .await
+        .unwrap();
+    let expect = RoomMemberList {
+        members: vec![
+            RoomMember {
+                id_key: ALICE.pubkeys.id_key.clone(),
+                permission: MemberPermission::ALL,
+                last_seen_cid: None,
+            },
+            RoomMember {
+                id_key: BOB.pubkeys.id_key.clone(),
+                permission: MemberPermission::POST_CHAT,
+                last_seen_cid: None,
+            },
+        ],
+        skip_token: None,
+    };
+    assert_eq!(got, expect);
+}

docs/webapi.yaml

@@ -511,6 +511,56 @@ paths:
               schema:
                 $ref: '#/components/schemas/ApiError'
 
+  /_blah/room/{rid}/member:
+    get:
+      summary: List room members
+      parameters:
+        - name: Authorization
+          in: header
+          required: true
+          description: Proof of membership.
+          schema:
+            $ref: '#/components/schemas/Signed-Auth'
+
+        - name: top
+          in: query
+          schema:
+            type: string
+          description:
+            The maximum count of rooms returned in a single response. This is
+            only an advice and server can clamp it to a smaller value.
+
+        - name: skipToken
+          in: query
+          schema:
+            type: string
+          description:
+            The page token returned from a previous list response to fetch the
+            next page.
+
+      responses:
+        200:
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/RoomMemberList'
+
+        403:
+          description: |
+            The user does not have permission to get room members
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ApiError'
+
+        404:
+          description: |
+            Room does not exist or the user is not in the room.
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ApiError'
+
 # Ideally we should generate these from src, but we need to
 # WAIT: https://github.com/juhaku/utoipa/pull/1034
 components:
@@ -635,6 +685,34 @@ components:
           description: The token for fetching the next page.
           type: string
 
+    RoomMemberList:
+      type: object
+      required:
+        - members
+      properties:
+        members:
+          description: Room members in server-specified order.
+          type: array
+          items:
+            $ref: '#/components/schemas/RoomMember'
+        skip_token:
+          description: The token for fetching the next page.
+          type: string
+
+    RoomMember:
+      type: object
+      required:
+        - id_key
+        - permission
+      properties:
+        id_key:
+          type: string
+        permission:
+          type: integer
+          format: int32
+        last_seen_cid:
+          type: string
+
     RichText:
       type: array
       items:

test-frontend/index.html

@@ -41,7 +41,7 @@
         & label {
           margin-left: 0;
         }
-        & > #rooms {
+        & > #rooms, & > #room-members {
           flex: 1;
         }
       }
@@ -128,6 +128,8 @@
         <label for="join-new-room">join new room:</label>
         <select id="join-new-room"></select>
       </div>
+      <label for="room-members">members:</label>
+      <select id="room-members" size="2"></select>
     </div>
 
     <div id="mainbar">

test-frontend/main.js

@@ -4,7 +4,8 @@ const msgFlow = document.querySelector('#msg-flow');
 const idPubkeyInput = document.querySelector('#id-pubkey');
 const actPubkeyDisplay = document.querySelector('#act-pubkey');
 const serverUrlInput = document.querySelector('#server-url');
-const roomsInput = document.querySelector('#rooms');
+const roomsList = document.querySelector('#rooms');
+const membersList = document.querySelector('#room-members');
 const joinNewRoomInput = document.querySelector('#join-new-room');
 const chatInput = document.querySelector('#chat');
 
@@ -25,6 +26,10 @@ function hexToBuf(hex) {
     return new Uint8Array(hex.match(/[\da-f]{2}/gi).map(m => parseInt(m, 16)))
 }
 
+function shortenIdKey(id_key) {
+    return id_key.replace(/^(.{4}).*(.{4})$/, '$1…$2');
+}
+
 function getIdPubkey() {
     const s = idPubkeyInput.value.trim();
     if (!s.match(/^[a-zA-Z0-9]{64}$/)) {
@@ -186,7 +191,7 @@ async function showChatMsg(chat) {
     }
 
     // TODO: The relationship of id_key and act_key is not verified.
-    const shortUser = chat.signee.id_key.replace(/^(.{4}).*(.{4})$/, '$1…$2');
+    const shortUser = shortenIdKey(chat.signee.id_key);
     const time = new Date(chat.signee.timestamp * 1000).toISOString();
 
     const el = document.createElement('div', {});
@@ -243,9 +248,10 @@ async function genAuthHeader() {
 async function enterRoom(rid) {
     log(`loading room: ${rid}`);
     curRoom = rid;
-    roomsInput.value = rid;
+    roomsList.value = rid;
 
     msgFlow.replaceChildren();
+    membersList.replaceChildren();
 
     let roomMetadata;
     try {
@@ -257,6 +263,20 @@ async function enterRoom(rid) {
         log(`failed to get room metadata: ${err}`);
     }
 
+    try {
+        const resp = await fetch(`${apiUrl}/room/${rid}/member`, await genAuthHeader());
+        const json = await resp.json();
+        if (resp.status !== 200) throw new Error(`status ${resp.status}: ${json.error.message}`);
+        for (const { id_key, permission, last_seen_cid } of json.members) {
+            const el = document.createElement('option')
+            el.value = id_key;
+            el.innerText = `${shortenIdKey(id_key)} perm=${permission} last_seen=${last_seen_cid || '-'}`;
+            membersList.appendChild(el);
+        }
+    } catch (err) {
+        log(`failed to fetch members: ${err}`);
+    }
+
     try {
         const resp = await fetch(`${apiUrl}/room/${rid}/msg`, await genAuthHeader());
         const json = await resp.json();
@@ -357,10 +377,10 @@ async function loadRoomList(autoJoin) {
         }
     }
 
-    loadInto(roomsInput, 'joined')
+    loadInto(roomsList, 'joined')
     .then(async (_) => {
         if (autoJoin) {
-            const el = roomsInput.querySelector('option:nth-child(2)');
+            const el = roomsList.querySelector('option:nth-child(2)');
             if (el !== null) {
                 await enterRoom(el.value);
             }
@@ -556,8 +576,8 @@ chatInput.onkeypress = async (e) => {
         chatInput.focus();
     }
 };
-roomsInput.onchange = async (_) => {
+roomsList.onchange = async (_) => {
-    await enterRoom(roomsInput.value);
+    await enterRoom(roomsList.value);
 };
 joinNewRoomInput.onchange = async (_) => {
     await joinRoom(joinNewRoomInput.value);