如何在自定义标签控件中从Okta获取令牌？WebView替换后的适配问题

Alright, let's break down how to get Okta tokens working with custom tab controls, since you're coming from the WebView approach which works a bit differently:

Key Difference Between WebView and Custom Tabs #

First off, let's clarify why your old WebView approach doesn't translate directly: Custom Tabs are system-managed, so they don't expose the same URL-interception hooks as WebView. The onNavigationEvent callback's bundle won't give you full URL details (for security reasons), so you need to use deep linking to capture Okta's callback instead.

Step 1: Configure Okta Callback URL #

Make sure your Okta application is set up with a deep-link redirect URI (e.g., com.your-app-id://okta-callback). This needs to match exactly what you'll configure in your Android app next.

Step 2: Set Up Intent Filter for Callback Handling #

Add an intent filter to an activity in your AndroidManifest.xml to capture the Okta redirect:

<activity android:name=".OktaCallbackActivity">
    <intent-filter>
        <action android:name="android.intent.action.VIEW" />
        <category android:name="android.intent.category.DEFAULT" />
        <category android:name="android.intent.category.BROWSABLE" />
        <!-- Match your Okta redirect URI here -->
        <data 
            android:scheme="com.your-app-id" 
            android:host="okta-callback" />
    </intent-filter>
</activity>

Step 3: Launch Custom Tabs with Okta Authorization URL #

When initiating the login flow, use CustomTabsIntent to open Okta's authorization page. You can still set a callback for navigation events, but remember it won't give you token details:

// Build the custom tab intent
CustomTabsIntent.Builder builder = new CustomTabsIntent.Builder();
builder.setToolbarColor(ContextCompat.getColor(this, R.color.your_primary_color));

// Optional navigation callback (for status updates only)
CustomTabsCallback tabCallback = new CustomTabsCallback() {
    @Override
    public void onNavigationEvent(int navigationEvent, Bundle extras) {
        super.onNavigationEvent(navigationEvent, extras);
        if (navigationEvent == CustomTabsCallback.NAVIGATION_FINISHED) {
            // Update UI state if needed, but no token data here
        }
    }
};
builder.setCallback(tabCallback);

// Launch Okta's authorization URL (fill in your Okta details)
String oktaAuthUrl = "https://your-okta-domain.com/oauth2/v1/authorize" +
        "?client_id=YOUR_OKTA_CLIENT_ID" +
        "&response_type=code" + // Recommended: Use code flow for security
        "&scope=openid profile offline_access" +
        "&redirect_uri=com.your-app-id://okta-callback";

CustomTabsIntent customTabsIntent = builder.build();
customTabsIntent.launchUrl(this, Uri.parse(oktaAuthUrl));

Step 4: Retrieve Tokens from the Callback Activity #

When Okta redirects back to your deep link, your OktaCallbackActivity will be launched. Extract the authorization code (or tokens, if using implicit flow) from the intent data:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Uri redirectUri = getIntent().getData();
    
    if (redirectUri != null) {
        // If using code flow (recommended):
        String authCode = redirectUri.getQueryParameter("code");
        if (authCode != null) {
            // Exchange code for access/refresh tokens via Okta's token endpoint
            // Use a network client (Retrofit, OkHttp) to call https://your-okta-domain.com/oauth2/v1/token
        }

        // If using implicit flow (less secure, not recommended):
        String accessToken = redirectUri.getQueryParameter("access_token");
        String refreshToken = redirectUri.getQueryParameter("refresh_token");
        String idToken = redirectUri.getQueryParameter("id_token");
        
        // Handle tokens (save to secure storage, update UI, etc.)
    }

    // Close the callback activity after processing
    finish();
}

Important Notes #

• Prefer Code Flow: Implicit flow exposes tokens in the URL, which is less secure. Use the authorization code flow instead, where you exchange the code for tokens via a backend or secure network call.
• Exact URI Match: Ensure your Okta app's redirect URI matches the one in your manifest down to the last character (no typos!).
• Secure Storage: Store tokens in EncryptedSharedPreferences or Keystore, never in plain text.

内容的提问来源于stack exchange，提问作者Jayawant Jagtap