Fix inability to join a knock room via space hierarchy view

src/components/structures/SpaceHierarchy.tsx

@@ -41,6 +41,7 @@ import {
     HistoryVisibility,
     HierarchyRelation,
     HierarchyRoom,
+    JoinRule,
 } from "matrix-js-sdk/src/matrix";
 import { RoomHierarchy } from "matrix-js-sdk/src/room-hierarchy";
 import classNames from "classnames";
@@ -157,7 +158,9 @@ const Tile: React.FC<ITileProps> = ({
                 <Spinner w={24} h={24} />
             </AccessibleTooltipButton>
         );
-    } else if (joinedRoom) {
+    } else if (joinedRoom || room.join_rule === JoinRule.Knock) {
+        // If the room is knockable, show the "View" button even if we are not a member; that
+        // allows us to reuse the "request to join" UX in RoomView.
         button = (
             <AccessibleButton
                 onClick={onPreviewClick}

test/components/structures/SpaceHierarchy-test.tsx

@@ -17,7 +17,7 @@ limitations under the License.
 import React from "react";
 import { mocked } from "jest-mock";
 import { fireEvent, render, screen, waitFor, waitForElementToBeRemoved } from "@testing-library/react";
-import { MatrixClient, Room, HierarchyRoom } from "matrix-js-sdk/src/matrix";
+import { HierarchyRoom, JoinRule, MatrixClient, Room } from "matrix-js-sdk/src/matrix";
 import { KnownMembership } from "matrix-js-sdk/src/types";
 import { RoomHierarchy } from "matrix-js-sdk/src/room-hierarchy";
 import { TooltipProvider } from "@vector-im/compound-web";
@@ -210,6 +210,13 @@ describe("SpaceHierarchy", () => {
                     type: "m.space.child",
                     sender: "@other:server",
                 },
+                {
+                    state_key: "!knock1:server",
+                    content: { order: "4" },
+                    origin_server_ts: 111,
+                    type: "m.space.child",
+                    sender: "@other:server",
+                },
             ],
             world_readable: true,
             guest_can_join: true,
@@ -253,9 +260,25 @@ describe("SpaceHierarchy", () => {
             world_readable: true,
             guest_can_join: true,
         };
+        const hierarchyKnockRoom1: HierarchyRoom = {
+            room_id: "!knock1:server",
+            name: "Knock room",
+            num_joined_members: 3,
+            children_state: [],
+            world_readable: true,
+            guest_can_join: true,
+            join_rule: JoinRule.Knock,
+        };
 
         mocked(client.getRoomHierarchy).mockResolvedValue({
-            rooms: [hierarchyRoot, hierarchyRoom1, hierarchyRoom2, hierarchySpace1, hierarchyRoom3],
+            rooms: [
+                hierarchyRoot,
+                hierarchyRoom1,
+                hierarchyRoom2,
+                hierarchySpace1,
+                hierarchyRoom3,
+                hierarchyKnockRoom1,
+            ],
         });
 
         const defaultProps = {
@@ -293,5 +316,24 @@ describe("SpaceHierarchy", () => {
             expect(client.joinRoom).toHaveBeenCalledWith(space1.roomId, expect.any(Object));
             expect(client.joinRoom).toHaveBeenCalledWith(room3.roomId, expect.any(Object));
         });
+
+        it("should take user to view room for unjoined knockable rooms", async () => {
+            jest.spyOn(dispatcher, "dispatch");
+
+            const { getByText } = render(getComponent());
+            // Wait for spinners to go away
+            await waitForElementToBeRemoved(screen.getAllByRole("progressbar"));
+            const button = getByText("Knock room")!
+                .closest("li")!
+                .querySelector(".mx_AccessibleButton_kind_primary_outline")!;
+            fireEvent.click(button);
+
+            expect(defaultProps.showRoom).toHaveBeenCalledWith(
+                expect.anything(),
+                expect.anything(),
+                hierarchyKnockRoom1.room_id,
+                undefined,
+            );
+        });
     });
 });

test/components/structures/__snapshots__/SpaceHierarchy-test.tsx.snap

@@ -195,6 +195,76 @@ exports[`SpaceHierarchy <SpaceHierarchy /> renders 1`] = `
         </div>
       </div>
     </li>
+    <li
+      class="mx_SpaceHierarchy_roomTileWrapper"
+      role="treeitem"
+    >
+      <div
+        class="mx_AccessibleButton mx_SpaceHierarchy_roomTile"
+        role="button"
+        tabindex="-1"
+      >
+        <div
+          class="mx_SpaceHierarchy_roomTile_item"
+        >
+          <div
+            class="mx_SpaceHierarchy_roomTile_avatar"
+          >
+            <span
+              class="_avatar_mcap2_17 mx_BaseAvatar _avatar-imageless_mcap2_61"
+              data-color="6"
+              data-testid="avatar-img"
+              data-type="round"
+              role="presentation"
+              style="--cpd-avatar-size: 20px;"
+            >
+              K
+            </span>
+          </div>
+          <div
+            class="mx_SpaceHierarchy_roomTile_name"
+          >
+            Knock room
+          </div>
+          <div
+            class="mx_SpaceHierarchy_roomTile_info"
+          >
+            3 members
+          </div>
+        </div>
+        <div
+          class="mx_SpaceHierarchy_actions"
+        >
+          <div
+            class="mx_AccessibleButton mx_AccessibleButton_hasKind mx_AccessibleButton_kind_primary_outline"
+            role="button"
+            tabindex="-1"
+          >
+            View
+          </div>
+          <span
+            class="mx_Checkbox mx_Checkbox_hasKind mx_Checkbox_kind_solid"
+          >
+            <input
+              id="checkbox_wKpa6hpi3Y"
+              tabindex="-1"
+              type="checkbox"
+            />
+            <label
+              for="checkbox_wKpa6hpi3Y"
+            >
+              <div
+                class="mx_Checkbox_background"
+              >
+                <div
+                  class="mx_Checkbox_checkmark"
+                />
+              </div>
+            </label>
+          </span>
+        </div>
+      </div>
+    </li>
     <li
       aria-expanded="true"
       class="mx_SpaceHierarchy_roomTileWrapper"
@@ -247,12 +317,12 @@ exports[`SpaceHierarchy <SpaceHierarchy /> renders 1`] = `
             class="mx_Checkbox mx_Checkbox_hasKind mx_Checkbox_kind_solid"
           >
             <input
-              id="checkbox_wKpa6hpi3Y"
+              id="checkbox_EetmBG4yVC"
               tabindex="-1"
               type="checkbox"
             />
             <label
-              for="checkbox_wKpa6hpi3Y"
+              for="checkbox_EetmBG4yVC"
             >
               <div
                 class="mx_Checkbox_background"
@@ -330,12 +400,12 @@ exports[`SpaceHierarchy <SpaceHierarchy /> renders 1`] = `
             >
               <input
                 disabled=""
-                id="checkbox_EetmBG4yVC"
+                id="checkbox_eEefiPqpMR"
                 tabindex="-1"
                 type="checkbox"
               />
               <label
-                for="checkbox_EetmBG4yVC"
+                for="checkbox_eEefiPqpMR"
               >
                 <div
                   class="mx_Checkbox_background"