Fix spaces support in UI

matrixgw_frontend/src/api/matrix/MatrixApiSpace.ts

@@ -0,0 +1,40 @@
+import { APIClient } from "../ApiClient";
+
+export type SpaceHierarchy = Map<string, string[]>;
+
+export class MatrixApiSpace {
+  /**
+   * Request Matrix space hierarchy
+   */
+  static async Hierarchy(): Promise<SpaceHierarchy> {
+    const hierarchy = new Map(
+      Object.entries(
+        (
+          await APIClient.exec({
+            method: "GET",
+            uri: "/matrix/space/hierarchy",
+          })
+        ).data as { [s: string]: string[] }
+      )
+    ) as SpaceHierarchy;
+
+    // Simplify hierarchy
+    while (true) {
+      let changed = false;
+      for (const [roomid, children] of hierarchy) {
+        for (const child of children) {
+          if (!hierarchy.has(child)) continue;
+          hierarchy.set(roomid, [
+            ...hierarchy.get(roomid)!,
+            ...hierarchy.get(child)!,
+          ]);
+          hierarchy.delete(child);
+          changed = true;
+        }
+      }
+      if (!changed) break;
+    }
+
+    return hierarchy;
+  }
+}