[lib] add identity register action

Summary:
since this action is native-specific, i've created a new interface for native-only client methods.

Depends on D10440

Test Plan: successfully dispatched the action on native and registered a new account with staging identity service

Reviewers: ashoat, tomek, inka

Reviewed By: ashoat

Differential Revision: https://phab.comm.dev/D10454

lib/actions/user-actions.js

@@ -30,6 +30,7 @@ import type {
   UpdateUserAvatarResponse,
 } from '../types/avatar-types.js';
 import type { RawEntryInfo, CalendarQuery } from '../types/entry-types.js';
+import type { IdentityRegisterResult } from '../types/identity-service-types.js';
 import type {
   RawMessageInfo,
   MessageTruncationStatuses,
@@ -372,6 +373,31 @@ function useKeyserverAuth(): (
   );
 }
 
+const identityRegisterActionTypes = Object.freeze({
+  started: 'IDENTITY_REGISTER_STARTED',
+  success: 'IDENTITY_REGISTER_SUCCESS',
+  failed: 'IDENTITY_REGISTER_FAILED',
+});
+function useIdentityRegister(): (
+  username: string,
+  password: string,
+) => Promise<IdentityRegisterResult> {
+  const client = React.useContext(IdentityClientContext);
+  const identityClient = client?.identityClient;
+  return React.useCallback(
+    (username, password) => {
+      if (!identityClient) {
+        throw new Error('Identity service client is not initialized');
+      }
+      if (!identityClient.registerUser) {
+        throw new Error('Register user method unimplemented');
+      }
+      return identityClient.registerUser(username, password);
+    },
+    [identityClient],
+  );
+}
+
 function mergeUserInfos(
   ...userInfoArrays: Array<$ReadOnlyArray<UserInfo>>
 ): UserInfo[] {
@@ -723,4 +749,6 @@ export {
   useDeleteIdentityAccount,
   keyserverAuthActionTypes,
   useKeyserverAuth,
+  identityRegisterActionTypes,
+  useIdentityRegister,
 };

lib/types/identity-service-types.js

@@ -22,6 +22,10 @@ export type OutboundKeyInfoResponse = {
 export interface IdentityServiceClient {
   +deleteUser: () => Promise<void>;
   +getKeyserverKeys: string => Promise<?OutboundKeyInfoResponse>;
+  +registerUser?: (
+    username: string,
+    password: string,
+  ) => Promise<IdentityRegisterResult>;
 }
 
 export type IdentityServiceAuthLayer = {
@@ -43,3 +47,9 @@ export type InboundKeyInfoResponse = {
   +username?: ?string,
   +walletAddress?: ?string,
 };
+
+export type IdentityRegisterResult = {
+  +userID: string,
+  +accessToken: string,
+  +username: string,
+};