Mobile SDK for Embedded Wallet (React Native)

The Sequence Embedded Wallet SDK can be used with React Native for complete Sequence Embedded Wallet and Indexer integration.

You can see a full example of how to use the SDK or download the template in the Embedded Wallet React Native Demo repository.

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Setting up with your own credentials/keys

Follow this guide to get your project access key and other credentials/keys: https://docs.sequence.xyz/solutions/builder/embedded-wallet/

./ios and ./android folder specific instructions for credentials/keys

iOS

Using Expo, you can set GIDClientID in ios > infoPlist in the app.json file.

Manually, you can set GIDClientID in the Info.plist file for Google sign in.

Android

Using Expo, you can set the intent-filter in android > intentFilters in the app.json file.

Manually, you can set the intent-filter in the AndroidManifest.xml file for Google sign in.

Integration details

Setup shims for ethers and other crypto related packages

First, let's check contents of cryptoSetup.ts for the set up of the shims and registering pbkdf2 for ethers from react-native-quick-crypto below:

import { install } from "react-native-quick-crypto";
install();
 
import "react-native-url-polyfill/auto";
import { ReadableStream } from "web-streams-polyfill";
globalThis.ReadableStream = ReadableStream;
 
import crypto from "react-native-quick-crypto";
global.getRandomValues = crypto.getRandomValues;
 
export * from "@ethersproject/shims";
 
import * as ethers from "ethers";
 
ethers.pbkdf2.register(
  (
    password: Uint8Array,
    salt: Uint8Array,
    iterations: number,
    keylen: number,
    algo: "sha256" | "sha512"
  ) => {
    console.info("Using react-native-quick-crypto for pbkdf2");
    return ethers.hexlify(
      new Uint8Array(
        crypto.pbkdf2Sync(
          password,
          salt,
          iterations,
          keylen,
          algo === "sha256" ? "SHA-256" : "SHA-512"
        )
      )
    );
  }
);
 
export * from "ethers";

Then make sure to import cryptoSetup.ts as early in the app lifecycle as you can. In this demo these are imported and set at the top in App.tsx.

Secondly, we need to set aliases for some shims, in babel.config.js with help of the babel-plugin-module-resolver dev dependency. See babel.config.js for the code snippet to update the aliases.

Initialize Sequence WaaS

export const sequenceWaas = new SequenceWaaS(
  {
    network: initialNetwork,
    projectAccessKey: projectAccessKey,
    waasConfigKey: waasConfigKey,
  },
  localStorage,
  null,
  new KeychainSecureStoreBackend()
);

(Check waasSetup.ts file for more details)

Signing in

Once you have an initialized Sequence WaaS instance, you can use it to sign in with email, Google or Apple. See the google code snippet below for an example, and check the App.tsx file for more details.

const redirectUri = `${iosRedirectUri}:/oauthredirect`;
 
const scopes = ["openid", "profile", "email"];
const request = new AuthRequest({
  clientId,
  scopes,
  redirectUri,
  usePKCE: true,
  extraParams: {
    audience: webClientId,
    include_granted_scopes: "true",
  },
});
 
const result = await request.promptAsync({
  authorizationEndpoint: `https://accounts.google.com/o/oauth2/v2/auth`,
});
 
if (result.type === "cancel") {
  return undefined;
}
 
const serverAuthCode = result?.params?.code;
 
const configForTokenExchange: AccessTokenRequestConfig = {
  code: serverAuthCode,
  redirectUri,
  clientId: iosClientId,
  extraParams: {
    code_verifier: request?.codeVerifier || "",
    audience: webClientId,
  },
};
 
const tokenResponse = await exchangeCodeAsync(configForTokenExchange, {
  tokenEndpoint: "https://oauth2.googleapis.com/token",
});
 
const userInfo = await fetchUserInfo(tokenResponse.accessToken);
 
const idToken = tokenResponse.idToken;
 
if (!idToken) {
  throw new Error("No idToken");
}
 
try {
  const signInResult = await sequenceWaas.signIn(
    {
      idToken: idToken,
    },
    randomName()
  );
 
  console.log("signInResult", JSON.stringify(signInResult));
} catch (e) {
  console.log("error", JSON.stringify(e));
}

Wallet operations

Once signed in, you can use the sequenceWaas instance to perform wallet operations like sending transactions, signing messages, etc. See the google code snippet below for an example, and check the App.tsx file for more details.

// Signing a message
const signature = await sequenceWaas.signMessage({ message: "your message" });
 
// Sending a txn
const txn = await sequenceWaas.sendTransaction({
  transactions: [
    {
      to: walletAddress,
      value: 0,
    },
  ],
});

Migration notes for Ethers v6 update

react-native-quick-crypto-ethers-patch.js and related configuration is no longer needed since ethers v6 allows us to register the pbkdf2 function directly from the react-native-quick-crypto package. (See cryptoSetup.ts for the related code.)
You can follow ethers migration guide to migrate your codebase to ethers v6.

Dependencies

Required Sequence packages

@0xsequence/waas
@0xsequence/react-native

Other Required dependencies/shims

Common

ethers
ethersproject/shims
expo
react-native-quick-crypto
react-native-mmkv
react-native-keychain
babel-plugin-module-resolver (as dev dependency)

For Apple and Google login

expo-web-browser
expo-auth-session
@invertase/react-native-apple-authentication

For Email login

react-native-url-polyfill
web-streams-polyfill