expo-icp-app-connect

This project provides hooks for invoking another application from the frontend and receiving result via deep link in Internet Computer (ICP) applications.

API

useAppConnect

A React hook for managing deep link connections to other apps, handling session, redirect, and result state. Now supports generics for connection and result parameter types.

Type Requirements

• YourConnectionParams must extend DeepLinkConnectionParams (from expo-icp-app-connect-helpers).
• YourResultParams must extend ParamsWithSessionId (from expo-icp-app-connect-helpers).

This ensures type safety for the connection and result parameters used in the hook.

import { useAppConnect } from 'expo-icp-app-connect';
import { DeepLinkConnectionParams, ParamsWithSessionId } from 'expo-icp-app-connect-helpers';

// Example custom types
interface MyConnectionParams extends DeepLinkConnectionParams {
  // ...other fields
}

interface MyResultParams extends ParamsWithSessionId {
  // ...fields returned from the deep link
}

const {
  appConnectResultParams,
  appConnectError,
  clearAppConnectError,
  connectToApp,
  buildAppConnectionParams,
} = useAppConnect<MyConnectionParams, MyResultParams>({
  pathname: '/myApp',
  regularStorage,
  cryptoModule,
});

• appConnectResultParams: The parameters received from the deep link, or undefined if not available.
• appConnectError: Any error encountered during the connection process.
• clearAppConnectError(): Clears the current error.
• connectToApp({ url, params, redirectPath }): Initiates a connection to another app. Returns a Promise resolving to the session ID.
• buildAppConnectionParams(params): Builds connection parameters with the current pathname. Returns the connection parameters of type YourConnectionParams.

Parameters

• pathname: string – The pathname of the page to redirect to (used for storage keys).
• regularStorage: Storage – Storage instance for session and redirect path.
• cryptoModule: CryptoModule – Crypto module for generating secure session IDs.

---

connectToApp

Establishes a secure session and opens the target app in a browser with the required parameters.

import { connectToApp } from 'expo-icp-app-connect';

await connectToApp<MyConnectionParams>({
  url: new URL('https://target.app'),
  params: { ... },
  redirectPath: '/return',
  redirectPathStorage,
  sessionIdStorage,
  cryptoModule,
  openBrowserOptions: { inNewTab: true },
});

Parameters

• url: URL – The URL of the app to connect to.
• params: DeepLinkConnectionParams – Parameters to include in the connection (will be extended with a session ID and deep link type).
• redirectPath: string | undefined – Path to redirect to after connecting.
• redirectPathStorage: StringValueStorageWrapper – Storage for the redirect path.
• sessionIdStorage: StringValueStorageWrapper – Storage for the session ID.
• cryptoModule: CryptoModule – Crypto module for generating the session ID.
• openBrowserOptions?: OpenBrowserOptions – Optional configuration for opening the browser.
  • inNewTab?: boolean – Whether to open in a new tab (web environments only).

Returns a Promise resolving to the generated session ID.

---

dismissBrowser

Dismisses the web browser after a short delay (500ms).

import { dismissBrowser } from 'expo-icp-app-connect';
await dismissBrowser();

---

handleURL

Parses a URL, verifies the session ID, and invokes callbacks for success or error.

import { handleURL } from 'expo-icp-app-connect';

await handleURL({
  url: new URL('https://example.com#test'),
  sessionIdStorage,
  onSuccess: (params) => { /* handle params */ },
  onError: (error) => { /* handle error */ },
  onFinally: () => { /* optional cleanup */ },
});

Parameters

• url: URL – The URL to parse.
• sessionIdStorage: StringValueStorageWrapper – Storage for the session ID.
• onSuccess: (params) => void – Callback for successful parsing and session verification.
• onError: (error) => void – Callback for errors.
• onFinally?: () => void – Optional cleanup callback.

---

openBrowser

Opens a browser window with the specified URL. In web environments, supports opening in a new tab.

import { openBrowser } from 'expo-icp-app-connect';

// Open in current window/tab
await openBrowser('https://target.app');

// Open in new tab (web only)
await openBrowser('https://target.app', { inNewTab: true });

Parameters

• url: string – The URL to open in the browser.
• options: OpenBrowserOptions – Optional configuration.
  • inNewTab?: boolean – Whether to open in a new tab (web environments only).