graphql: Add a method to look up a group's details

server/src/infra/graphql/query.rs

@@ -139,6 +139,17 @@ impl<Handler: BackendHandler + Sync> Query<Handler> {
             .await
             .map(|v| v.into_iter().map(Into::into).collect())?)
     }
+
+    async fn group(context: &Context<Handler>, group_id: i32) -> FieldResult<Group<Handler>> {
+        if !context.validation_result.is_admin {
+            return Err("Unauthorized access to group data".into());
+        }
+        Ok(context
+            .handler
+            .get_group_details(GroupId(group_id))
+            .await
+            .map(Into::into)?)
+    }
 }
 
 #[derive(PartialEq, Eq, Debug, Serialize, Deserialize)]

server/src/infra/tcp_backend_handler.rs

@@ -29,6 +29,7 @@ mockall::mock! {
         async fn list_users(&self, filters: Option<RequestFilter>) -> DomainResult<Vec<User>>;
         async fn list_groups(&self) -> DomainResult<Vec<Group>>;
         async fn get_user_details(&self, user_id: &str) -> DomainResult<User>;
+        async fn get_group_details(&self, group_id: GroupId) -> DomainResult<GroupIdAndName>;
         async fn get_user_groups(&self, user: &str) -> DomainResult<HashSet<GroupIdAndName>>;
         async fn create_user(&self, request: CreateUserRequest) -> DomainResult<()>;
         async fn update_user(&self, request: UpdateUserRequest) -> DomainResult<()>;