Admin API to list and get user sessions

crates/handlers/src/admin/mod.rs

@@ -78,6 +78,11 @@ where
                     description: Some("Manage emails associated with users".to_owned()),
                     ..Tag::default()
                 })
+                .tag(Tag {
+                    name: "user-sessions".to_owned(),
+                    description: Some("Manage browser sessions of users".to_owned()),
+                    ..Tag::default()
+                })
                 .security_scheme(
                     "oauth2",
                     SecurityScheme::OAuth2 {

crates/handlers/src/admin/model.rs

@@ -372,3 +372,87 @@ impl Resource for OAuth2Session {
         self.id
     }
 }
+
+/// The browser (cookie) session for a user
+#[derive(Serialize, JsonSchema)]
+pub struct UserSession {
+    #[serde(skip)]
+    id: Ulid,
+
+    /// When the object was created
+    created_at: DateTime<Utc>,
+
+    /// When the session was finished
+    finished_at: Option<DateTime<Utc>>,
+
+    /// The ID of the user who owns the session
+    #[schemars(with = "super::schema::Ulid")]
+    user_id: Ulid,
+
+    /// The user agent string of the client which started this session
+    user_agent: Option<String>,
+
+    /// The last time the session was active
+    last_active_at: Option<DateTime<Utc>>,
+
+    /// The last IP address used by the session
+    last_active_ip: Option<IpAddr>,
+}
+
+impl From<mas_data_model::BrowserSession> for UserSession {
+    fn from(value: mas_data_model::BrowserSession) -> Self {
+        Self {
+            id: value.id,
+            created_at: value.created_at,
+            finished_at: value.finished_at,
+            user_id: value.user.id,
+            user_agent: value.user_agent.map(|ua| ua.raw),
+            last_active_at: value.last_active_at,
+            last_active_ip: value.last_active_ip,
+        }
+    }
+}
+
+impl UserSession {
+    /// Samples of user sessions
+    pub fn samples() -> [Self; 3] {
+        [
+            Self {
+                id: Ulid::from_bytes([0x01; 16]),
+                created_at: DateTime::default(),
+                finished_at: None,
+                user_id: Ulid::from_bytes([0x02; 16]),
+                user_agent: Some("Mozilla/5.0".to_owned()),
+                last_active_at: Some(DateTime::default()),
+                last_active_ip: Some("127.0.0.1".parse().unwrap()),
+            },
+            Self {
+                id: Ulid::from_bytes([0x02; 16]),
+                created_at: DateTime::default(),
+                finished_at: None,
+                user_id: Ulid::from_bytes([0x03; 16]),
+                user_agent: None,
+                last_active_at: None,
+                last_active_ip: None,
+            },
+            Self {
+                id: Ulid::from_bytes([0x03; 16]),
+                created_at: DateTime::default(),
+                finished_at: Some(DateTime::default()),
+                user_id: Ulid::from_bytes([0x04; 16]),
+                user_agent: Some("Mozilla/5.0".to_owned()),
+                last_active_at: Some(DateTime::default()),
+                last_active_ip: Some("127.0.0.1".parse().unwrap()),
+            },
+        ]
+    }
+}
+
+impl Resource for UserSession {
+    const KIND: &'static str = "user-session";
+    const PATH: &'static str = "/api/admin/v1/user-sessions";
+
+    fn id(&self) -> Ulid {
+        self.id
+    }
+}

crates/handlers/src/admin/v1/mod.rs

@@ -18,6 +18,7 @@ use crate::passwords::PasswordManager;
 mod compat_sessions;
 mod oauth2_sessions;
 mod user_emails;
+mod user_sessions;
 mod users;
 
 pub fn router<S>() -> ApiRouter<S>
@@ -86,4 +87,12 @@ where
             "/user-emails/{id}",
             get_with(self::user_emails::get, self::user_emails::get_doc),
         )
+        .api_route(
+            "/user-sessions",
+            get_with(self::user_sessions::list, self::user_sessions::list_doc),
+        )
+        .api_route(
+            "/user-sessions/{id}",
+            get_with(self::user_sessions::get, self::user_sessions::get_doc),
+        )
 }

crates/handlers/src/admin/v1/user_sessions/get.rs

@@ -0,0 +1,136 @@
+// Copyright 2025 New Vector Ltd.
+//
+// SPDX-License-Identifier: AGPL-3.0-only
+// Please see LICENSE in the repository root for full details.
+
+use aide::{transform::TransformOperation, OperationIo};
+use axum::{response::IntoResponse, Json};
+use hyper::StatusCode;
+use ulid::Ulid;
+
+use crate::{
+    admin::{
+        call_context::CallContext,
+        model::UserSession,
+        params::UlidPathParam,
+        response::{ErrorResponse, SingleResponse},
+    },
+    impl_from_error_for_route,
+};
+
+#[derive(Debug, thiserror::Error, OperationIo)]
+#[aide(output_with = "Json<ErrorResponse>")]
+pub enum RouteError {
+    #[error(transparent)]
+    Internal(Box<dyn std::error::Error + Send + Sync + 'static>),
+
+    #[error("User session ID {0} not found")]
+    NotFound(Ulid),
+}
+
+impl_from_error_for_route!(mas_storage::RepositoryError);
+
+impl IntoResponse for RouteError {
+    fn into_response(self) -> axum::response::Response {
+        let error = ErrorResponse::from_error(&self);
+        let status = match self {
+            Self::Internal(_) => StatusCode::INTERNAL_SERVER_ERROR,
+            Self::NotFound(_) => StatusCode::NOT_FOUND,
+        };
+        (status, Json(error)).into_response()
+    }
+}
+
+pub fn doc(operation: TransformOperation) -> TransformOperation {
+    operation
+        .id("getUserSession")
+        .summary("Get a user session")
+        .tag("user-session")
+        .response_with::<200, Json<SingleResponse<UserSession>>, _>(|t| {
+            let [sample, ..] = UserSession::samples();
+            let response = SingleResponse::new_canonical(sample);
+            t.description("User session was found").example(response)
+        })
+        .response_with::<404, RouteError, _>(|t| {
+            let response = ErrorResponse::from_error(&RouteError::NotFound(Ulid::nil()));
+            t.description("User session was not found")
+                .example(response)
+        })
+}
+
+#[tracing::instrument(name = "handler.admin.v1.user_sessions.get", skip_all, err)]
+pub async fn handler(
+    CallContext { mut repo, .. }: CallContext,
+    id: UlidPathParam,
+) -> Result<Json<SingleResponse<UserSession>>, RouteError> {
+    let session = repo
+        .browser_session()
+        .lookup(*id)
+        .await?
+        .ok_or(RouteError::NotFound(*id))?;
+
+    Ok(Json(SingleResponse::new_canonical(UserSession::from(
+        session,
+    ))))
+}
+
+#[cfg(test)]
+mod tests {
+    use hyper::{Request, StatusCode};
+    use insta::assert_json_snapshot;
+    use sqlx::PgPool;
+
+    use crate::test_utils::{setup, RequestBuilderExt, ResponseExt, TestState};
+
+    #[sqlx::test(migrator = "mas_storage_pg::MIGRATOR")]
+    async fn test_get(pool: PgPool) {
+        setup();
+        let mut state = TestState::from_pool(pool).await.unwrap();
+        let token = state.token_with_scope("urn:mas:admin").await;
+        let mut rng = state.rng();
+
+        // Provision a user and a user session
+        let mut repo = state.repository().await.unwrap();
+        let user = repo
+            .user()
+            .add(&mut rng, &state.clock, "alice".to_owned())
+            .await
+            .unwrap();
+        let session = repo
+            .browser_session()
+            .add(&mut rng, &state.clock, &user, None)
+            .await
+            .unwrap();
+        repo.save().await.unwrap();
+
+        let session_id = session.id;
+        let request = Request::get(format!("/api/admin/v1/user-sessions/{session_id}"))
+            .bearer(&token)
+            .empty();
+        let response = state.request(request).await;
+        response.assert_status(StatusCode::OK);
+        let body: serde_json::Value = response.json();
+        assert_json_snapshot!(body, @r###"
+        {
+          "data": {
+            "type": "user-session",
+            "id": "01FSHN9AG0AJ6AC5HQ9X6H4RP4",
+            "attributes": {
+              "created_at": "2022-01-16T14:40:00Z",
+              "finished_at": null,
+              "user_id": "01FSHN9AG0MZAA6S4AF7CTV32E",
+              "user_agent": null,
+              "last_active_at": null,
+              "last_active_ip": null
+            },
+            "links": {
+              "self": "/api/admin/v1/user-sessions/01FSHN9AG0AJ6AC5HQ9X6H4RP4"
+            }
+          },
+          "links": {
+            "self": "/api/admin/v1/user-sessions/01FSHN9AG0AJ6AC5HQ9X6H4RP4"
+          }
+        }
+        "###);
+    }
+}