Add public room directory hook (#8626)

src/hooks/useUserDirectory.ts

@@ -0,0 +1,64 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { useCallback, useState } from "react";
+
+import { MatrixClientPeg } from "../MatrixClientPeg";
+import { DirectoryMember } from "../utils/direct-messages";
+
+export interface IUserDirectoryOpts {
+    limit: number;
+    query?: string;
+}
+
+export const useUserDirectory = () => {
+    const [users, setUsers] = useState<DirectoryMember[]>([]);
+
+    const [loading, setLoading] = useState(false);
+
+    const search = useCallback(async ({
+        limit = 20,
+        query: term,
+    }: IUserDirectoryOpts): Promise<boolean> => {
+        if (!term?.length) {
+            setUsers([]);
+            return true;
+        }
+
+        try {
+            setLoading(true);
+            const { results } = await MatrixClientPeg.get().searchUserDirectory({
+                limit,
+                term,
+            });
+            setUsers(results.map(user => new DirectoryMember(user)));
+            return true;
+        } catch (e) {
+            console.error("Could not fetch user in user directory for params", { limit, term }, e);
+            setUsers([]);
+            return false;
+        } finally {
+            setLoading(false);
+        }
+    }, []);
+
+    return {
+        ready: true,
+        loading,
+        users,
+        search,
+    } as const;
+};