Configure global storage

src/contexts/HSContext.ts

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+/*
+Copyright 2020 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 React from 'react';
+import { string, object, union, literal, TypeOf } from 'zod';
+
+import { persistReducer } from '../utils/localStorage';
+
+//import { prefixFetch, Client, discoverServer } from 'matrix-cypher';
+
+enum HSOptions {
+    // The homeserver contact policy hasn't
+    // been set yet.
+    Unset = 'UNSET',
+    // Matrix.to should only contact a single provided homeserver
+    TrustedClientOnly = 'TRUSTED_CLIENT_ONLY',
+    // Matrix.to may contact any homeserver it requires
+    Any = 'ANY',
+    // Matrix.to may not contact any homeservers
+    None = 'NONE',
+}
+
+const STATE_SCHEMA = union([
+    object({
+        option: literal(HSOptions.Unset),
+    }),
+    object({
+        option: literal(HSOptions.None),
+    }),
+    object({
+        option: literal(HSOptions.Any),
+    }),
+    object({
+        option: literal(HSOptions.TrustedClientOnly),
+        hs: string(),
+    }),
+]);
+
+type State = TypeOf<typeof STATE_SCHEMA>;
+
+// TODO: rename actions to something with more meaning out of context
+export enum ActionTypes {
+    SetHS = 'SET_HS',
+    SetAny = 'SET_ANY',
+    SetNone = 'SET_NONE',
+}
+
+export interface SetHS {
+    action: ActionTypes.SetHS;
+    HSURL: string;
+}
+
+export interface SetAny {
+    action: ActionTypes.SetAny;
+}
+
+export interface SetNone {
+    action: ActionTypes.SetNone;
+}
+
+export type Action = SetHS | SetAny | SetNone;
+
+export const INITIAL_STATE: State = {
+    option: HSOptions.Unset,
+};
+
+export const [initialState, reducer] = persistReducer(
+    'home-server-options',
+    INITIAL_STATE,
+    STATE_SCHEMA,
+    (state: State, action: Action): State => {
+        switch (action.action) {
+            case ActionTypes.SetNone:
+                return {
+                    option: HSOptions.None,
+                };
+            case ActionTypes.SetAny:
+                return {
+                    option: HSOptions.Any,
+                };
+            case ActionTypes.SetHS:
+                return {
+                    option: HSOptions.TrustedClientOnly,
+                    hs: action.HSURL,
+                };
+            default:
+                return state;
+        }
+    }
+);
+
+// The defualt reducer needs to be overwritten with the one above
+// after it's been put through react's useReducer
+const { Provider, Consumer } = React.createContext<
+    [State, React.Dispatch<Action>]
+>([initialState, (): void => {}]);
+
+// Quick rename to make importing easier
+export const HSProvider = Provider;
+export const HSConsumer = Consumer;