React Native

Integrate the Human Token Journey into your React Native app via a native module.

Markdown

The integration uses a native module that delegates to ASWebAuthenticationSession on iOS and Custom Tabs on Android. When the journey finishes, the native module resolves the promise with the callback URL.

Prerequisites

• React Native 0.71 or later
• Xcode 14+ for iOS
• Android Studio for Android
• A unique URL scheme for your app (e.g. myapp)

Step 1: Define your URL scheme

Choose a unique scheme (e.g. myapp). This is used as the callbackUri when creating the process:

callbackUri: myapp://callback

Step 2: Create the TypeScript bridge

// src/modules/UnicoModule.ts
import { NativeModules } from 'react-native';

const { UnicoModule } = NativeModules;

if (!UnicoModule) {
  throw new Error('UnicoModule not found. Make sure the native module is linked correctly.');
}

export const Unico = {
  openSession: (url: string): Promise<string> => UnicoModule.openSession(url),
};

Step 3: Implement the iOS native module

Objective-C bridge

// ios/UnicoModule.m
#import <React/RCTBridgeModule.h>

@interface RCT_EXTERN_MODULE(UnicoModule, NSObject)
RCT_EXTERN_METHOD(openSession:(NSString *)url
                  resolve:(RCTPromiseResolveBlock)resolve
                  reject:(RCTPromiseRejectBlock)reject)
@end

Swift implementation

// ios/UnicoModule.swift
import AuthenticationServices

@objc(UnicoModule)
class UnicoModule: NSObject, ASWebAuthenticationPresentationContextProviding {

    private var session: ASWebAuthenticationSession?

    @objc func openSession(_ url: String,
                           resolve: @escaping RCTPromiseResolveBlock,
                           reject: @escaping RCTPromiseRejectBlock) {
        guard let sessionURL = URL(string: url) else {
            reject("INVALID_URL", "Invalid URL", nil)
            return
        }
        DispatchQueue.main.async {
            let newSession = ASWebAuthenticationSession(
                url: sessionURL,
                callbackURLScheme: "myapp"
            ) { callbackURL, error in
                self.session = nil
                if let callbackURL = callbackURL {
                    resolve(callbackURL.absoluteString)
                } else {
                    reject("SESSION_ERROR", error?.localizedDescription ?? "Session cancelled", error)
                }
            }
            newSession.presentationContextProvider = self
            newSession.prefersEphemeralWebBrowserSession = true
            newSession.start()
            self.session = newSession
        }
    }

    func presentationAnchor(for session: ASWebAuthenticationSession) -> ASPresentationAnchor {
        guard let windowScene = UIApplication.shared.connectedScenes.first as? UIWindowScene,
              let window = windowScene.windows.first else {
            return ASPresentationAnchor()
        }
        return window
    }

    @objc static func requiresMainQueueSetup() -> Bool { return true }
}

Step 4: Implement the Android native module

Add the dependency to android/app/build.gradle:

implementation("androidx.browser:browser:1.5.0")

// android/app/src/main/java/<your.package>/UnicoModule.kt
package com.yourapp

import android.content.Intent
import android.net.Uri
import androidx.browser.customtabs.CustomTabsIntent
import com.facebook.react.bridge.*

class UnicoModule(private val reactContext: ReactApplicationContext) :
    ReactContextBaseJavaModule(reactContext) {

    private var pendingPromise: Promise? = null

    override fun getName() = "UnicoModule"

    @ReactMethod
    fun openSession(url: String, promise: Promise) {
        pendingPromise = promise
        currentActivity?.runOnUiThread {
            CustomTabsIntent.Builder().build()
                .launchUrl(currentActivity!!, Uri.parse(url))
        } ?: promise.reject("NO_ACTIVITY", "No current activity")
    }

    fun handleRedirectUrl(uri: Uri) {
        if (uri.scheme == "myapp") {
            pendingPromise?.resolve(uri.toString())
            pendingPromise = null
        }
    }
}

// UnicoPackage.kt
package com.yourapp

import com.facebook.react.ReactPackage
import com.facebook.react.bridge.NativeModule
import com.facebook.react.bridge.ReactApplicationContext
import com.facebook.react.uimanager.ViewManager

class UnicoPackage : ReactPackage {
    override fun createNativeModules(ctx: ReactApplicationContext): List<NativeModule> =
        listOf(UnicoModule(ctx))
    override fun createViewManagers(ctx: ReactApplicationContext): List<ViewManager<*, *>> =
        emptyList()
}

Register in MainApplication.kt:

override fun getPackages(): List<ReactPackage> =
    PackageList(this).packages.apply {
        add(UnicoPackage())
    }

Handle redirects in MainActivity.kt:

override fun onNewIntent(intent: Intent) {
    super.onNewIntent(intent)
    intent.data?.let { uri ->
        if (uri.scheme == "myapp") {
            val module = reactInstanceManager
                .currentReactContext
                ?.getNativeModule(UnicoModule::class.java)
            module?.handleRedirectUrl(uri)
        }
    }
}

Step 5: Configure AndroidManifest.xml

<uses-feature android:name="android.hardware.camera" android:required="false" />
<uses-permission android:name="android.permission.CAMERA" />

<activity android:name=".MainActivity" ...>
    <intent-filter>
        <action android:name="android.intent.action.VIEW" />
        <category android:name="android.intent.category.DEFAULT" />
        <category android:name="android.intent.category.BROWSABLE" />
        <data android:scheme="myapp" android:host="callback" />
    </intent-filter>
</activity>

Step 6: Launch the journey

import { Unico } from './modules/UnicoModule';

const resultUrl = await Unico.openSession(processLink);
// resultUrl = myapp://callback?id=...

File summary

File	Purpose
src/modules/UnicoModule.ts	TypeScript bridge
ios/UnicoModule.m	Objective-C declaration
ios/UnicoModule.swift	iOS — ASWebAuthenticationSession
android/.../UnicoModule.kt	Android — Custom Tabs
android/.../UnicoPackage.kt	Package registration
android/.../MainApplication.kt	Package integration
android/.../MainActivity.kt	Redirect URL handling
AndroidManifest.xml	Intent filter