Add .well-known config option to force disable encryption on room creation (#11120)

* force disable encryption on room creation

* test allowChangingEncryption

* move into utils/room directory

* tests

* unit test CreateRoomDialog

* remove debug

* wait for constructor promises to settle

* test case for force_disable

* comment

* set forced value after resolving checkUserIsAllowedToChangeEncryption

* tidy and comments

* use label text in test

test/utils/room/shouldForceDisableEncryption-test.ts

@@ -0,0 +1,68 @@
+/*
+Copyright 2023 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 { shouldForceDisableEncryption } from "../../../src/utils/room/shouldForceDisableEncryption";
+import { getMockClientWithEventEmitter } from "../../test-utils";
+
+describe("shouldForceDisableEncryption()", () => {
+    const mockClient = getMockClientWithEventEmitter({
+        getClientWellKnown: jest.fn(),
+    });
+
+    beforeEach(() => {
+        mockClient.getClientWellKnown.mockReturnValue(undefined);
+    });
+
+    it("should return false when there is no e2ee well known", () => {
+        expect(shouldForceDisableEncryption(mockClient)).toEqual(false);
+    });
+
+    it("should return false when there is no force_disable property", () => {
+        mockClient.getClientWellKnown.mockReturnValue({
+            "io.element.e2ee": {
+                // empty
+            },
+        });
+        expect(shouldForceDisableEncryption(mockClient)).toEqual(false);
+    });
+
+    it("should return false when force_disable property is falsy", () => {
+        mockClient.getClientWellKnown.mockReturnValue({
+            "io.element.e2ee": {
+                force_disable: false,
+            },
+        });
+        expect(shouldForceDisableEncryption(mockClient)).toEqual(false);
+    });
+
+    it("should return false when force_disable property is not equal to true", () => {
+        mockClient.getClientWellKnown.mockReturnValue({
+            "io.element.e2ee": {
+                force_disable: 1,
+            },
+        });
+        expect(shouldForceDisableEncryption(mockClient)).toEqual(false);
+    });
+
+    it("should return true when force_disable property is true", () => {
+        mockClient.getClientWellKnown.mockReturnValue({
+            "io.element.e2ee": {
+                force_disable: true,
+            },
+        });
+        expect(shouldForceDisableEncryption(mockClient)).toEqual(true);
+    });
+});