feat: Add room members api

CHANGELOG.md

@@ -9,6 +9,7 @@ Improvement:
 
 * The list_room response now includes the `room_type` field
 * Add room_details api
+* Add room_members api
 
 # 0.7.0
 

src/rooms.rs

@@ -2,3 +2,4 @@
 
 pub mod list_rooms;
 pub mod room_details;
+pub mod room_members;

src/rooms/room_members.rs

@@ -0,0 +1,3 @@
+//! Different versions of the endpoint to list room members.
+
+pub mod v1;

src/rooms/room_members/v1.rs

@@ -0,0 +1,44 @@
+//! [GET /_synapse/admin/v1/rooms/:room_id/members](https://github.com/element-hq/synapse/blob/master/docs/admin_api/rooms.md#room-members-api)
+use ruma::{
+    api::{metadata, request, response, Metadata},
+    OwnedRoomId, OwnedUserId, UInt,
+};
+
+const METADATA: Metadata = metadata! {
+    method: GET,
+    rate_limited: false,
+    authentication: AccessToken,
+    history: {
+        unstable => "/_synapse/admin/v1/rooms/:room_id/members",
+    }
+};
+
+#[request]
+pub struct Request {
+    /// ID of the room to list the members of.
+    #[ruma_api(path)]
+    pub room_id: OwnedRoomId,
+}
+
+#[response]
+pub struct Response {
+    /// List of members that are present in the room
+    pub members: Vec<OwnedUserId>,
+
+    /// Amount of members in the room.
+    pub total: UInt,
+}
+
+impl Request {
+    /// Creates a `Request` with the given room ID.
+    pub fn new(room_id: OwnedRoomId) -> Self {
+        Self { room_id }
+    }
+}
+
+impl Response {
+    /// Creates a `Response` with the given members and total count,
+    pub fn new(members: Vec<OwnedUserId>, total: UInt) -> Self {
+        Self { members, total }
+    }
+}