feat: multichain initial request+deeplinks

packages/sdk-multichain/package.json

@@ -32,6 +32,7 @@
     "@biomejs/biome": "2.0.0",
     "@metamask/auto-changelog": "^3.4.3",
     "@react-native-async-storage/async-storage": "^1.23.1",
+    "@types/jsdom": "^21.1.7",
     "@types/ws": "^8.18.1",
     "@vitest/coverage-v8": "^3.2.4",
     "esbuild-plugin-umd-wrapper": "^3.0.0",
@@ -53,8 +54,8 @@
   },
   "license": "MIT",
   "dependencies": {
-    "@metamask/mobile-wallet-protocol-core": "^0.1.0",
-    "@metamask/mobile-wallet-protocol-dapp-client": "^0.1.0",
+    "@metamask/mobile-wallet-protocol-core": "^0.2.0",
+    "@metamask/mobile-wallet-protocol-dapp-client": "^0.2.1",
     "@metamask/multichain-api-client": "^0.8.0",
     "@metamask/onboarding": "^1.0.1",
     "@metamask/sdk-analytics": "workspace:^",

packages/sdk-multichain/src/config/index.ts

@@ -1 +1,4 @@
 export const MWP_RELAY_URL = 'wss://mm-sdk-relay.api.cx.metamask.io/connection/websocket';
+
+export const METAMASK_CONNECT_BASE_URL = 'https://metamask.app.link/connect';
+export const METAMASK_DEEPLINK_BASE = 'metamask://connect';

packages/sdk-multichain/src/domain/errors/rpc.ts

@@ -29,6 +29,6 @@ export class RPCReadonlyRequestErr extends BaseErr<'RPC', RPCErrorCodes> {
 export class RPCInvokeMethodErr extends BaseErr<'RPC', RPCErrorCodes> {
 	static readonly code = 53;
 	constructor(public readonly reason: string) {
-		super(`RPCErr${RPCInvokeMethodErr.code}: RPC Client invoke method reason ${reason}`, RPCInvokeMethodErr.code);
+		super(`RPCErr${RPCInvokeMethodErr.code}: RPC Client invoke method reason (${reason})`, RPCInvokeMethodErr.code);
 	}
 }

packages/sdk-multichain/src/domain/multichain/index.ts

@@ -25,7 +25,6 @@ export abstract class MultichainCore extends EventEmitter<SDKEvents> {
 	abstract provider: MultichainApiClient<RPCAPI>;
 	abstract transport: Transport;
 
-	abstract getCurrentSession(): Promise<SessionData | undefined>;
 	/**
 	 * Establishes a connection to the multichain provider, or re-use existing session
 	 *

packages/sdk-multichain/src/domain/multichain/types.ts

@@ -1,9 +1,11 @@
 import type { StoreClient } from '../store';
-import type { MultichainCore, SessionData } from '.';
-import type { RPC_URLS_MAP } from './api/types';
+import type { MultichainCore } from '.';
+import type { RPC_URLS_MAP, Scope } from './api/types';
 import type { ModalFactory } from '../../ui';
 import type { SessionRequest } from '@metamask/mobile-wallet-protocol-core';
 import type { PlatformType } from '../platform';
+import type { Transport } from '@metamask/multichain-api-client';
+import type { CaipAccountId } from '@metamask/utils';
 
 export type { SessionData } from '@metamask/multichain-api-client';
 
@@ -56,13 +58,19 @@ export type MultichainOptions = {
 		preferDesktop?: boolean;
 	};
 	mobile?: {
+		preferredOpenLink?: (deeplink: string, target?: string) => void;
+		/**
+		 * The `MetaMaskSDK` constructor option `useDeeplink: boolean` controls which type of link is used:
+		 * -   If `true`, the SDK will attempt to use the `metamask://` deeplink.
+		 * -   If `false` (the default for web), the SDK will use the `https://metamask.app.link` universal link.
+		 */
 		useDeeplink?: boolean;
 	};
 	/** Optional transport configuration */
 	transport?: {
 		/** Extension ID for browser extension transport */
 		extensionId?: string;
-		onResumeSession?: (session: SessionData) => void;
+		onNotification?: (notification: unknown) => void;
 	};
 };
 
@@ -79,3 +87,7 @@ type MultiChainFNOptions = Omit<MultichainOptions, 'storage' | 'ui'> & {
  * providing all necessary options for SDK initialization.
  */
 export type CreateMultichainFN = (options: MultiChainFNOptions) => Promise<MultichainCore>;
+
+export type ExtendedTransport = Omit<Transport, 'connect'> & {
+	connect: (props?: { scopes: Scope[]; caipAccountIds: CaipAccountId[] }) => Promise<void>;
+};

packages/sdk-multichain/src/domain/platform/index.ts

@@ -74,3 +74,15 @@ export function isMetamaskExtensionInstalled(): boolean {
 	}
 	return Boolean(window.ethereum?.isMetaMask);
 }
+
+export function isSecure() {
+	const platformType = getPlatformType();
+	return isReactNative() || platformType === PlatformType.MobileWeb;
+}
+
+export function hasExtension() {
+	if (typeof window !== 'undefined') {
+		return window.ethereum?.isMetaMask ?? false;
+	}
+	return false;
+}

packages/sdk-multichain/src/domain/ui/types.ts

@@ -15,7 +15,7 @@ export interface InstallWidgetProps extends Components.MmInstallModal {
 
 export interface OTPCodeWidgetProps extends Components.MmOtpModal {
 	parentElement?: Element;
-	onClose: () => void;
+	onClose: () => Promise<void>;
 	onDisconnect?: () => void;
 	createOTPCode: () => Promise<OTPCode>;
 	updateOTPCode: (otpValue: string) => void;