/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.captiveportallogin;
import android.app.Activity;
import android.app.LoadedApk;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.ConnectivityManager;
import android.net.ConnectivityManager.NetworkCallback;
import android.net.Network;
import android.net.NetworkCapabilities;
import android.net.NetworkRequest;
import android.net.Proxy;
import android.net.Uri;
import android.net.http.SslError;
import android.os.Bundle;
import android.provider.Settings;
import android.provider.Settings.Global;
import android.util.ArrayMap;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.webkit.SslErrorHandler;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.lang.InterruptedException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
public class CaptivePortalLoginActivity extends Activity {
private static final String TAG = "CaptivePortalLogin";
private static final String DEFAULT_SERVER = "connectivitycheck.android.com";
private static final int SOCKET_TIMEOUT_MS = 10000;
// Keep this in sync with NetworkMonitor.
// Intent broadcast to ConnectivityService indicating sign-in is complete.
// Extras:
// EXTRA_TEXT = netId
// LOGGED_IN_RESULT = one of the CAPTIVE_PORTAL_APP_RETURN_* values below.
// RESPONSE_TOKEN = data fragment from launching Intent
private static final String ACTION_CAPTIVE_PORTAL_LOGGED_IN =
"android.net.netmon.captive_portal_logged_in";
private static final String LOGGED_IN_RESULT = "result";
private static final int CAPTIVE_PORTAL_APP_RETURN_APPEASED = 0;
private static final int CAPTIVE_PORTAL_APP_RETURN_UNWANTED = 1;
private static final int CAPTIVE_PORTAL_APP_RETURN_WANTED_AS_IS = 2;
private static final String RESPONSE_TOKEN = "response_token";
private URL mURL;
private int mNetId;
private String mResponseToken;
private NetworkCallback mNetworkCallback;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
String server = Settings.Global.getString(getContentResolver(), "captive_portal_server");
if (server == null) server = DEFAULT_SERVER;
try {
mURL = new URL("http", server, "/generate_204");
final Uri dataUri = getIntent().getData();
if (!dataUri.getScheme().equals("netid")) {
throw new MalformedURLException();
}
mNetId = Integer.parseInt(dataUri.getSchemeSpecificPart());
mResponseToken = dataUri.getFragment();
} catch (MalformedURLException|NumberFormatException e) {
// System misconfigured, bail out in a way that at least provides network access.
done(CAPTIVE_PORTAL_APP_RETURN_WANTED_AS_IS);
}
final ConnectivityManager cm = ConnectivityManager.from(this);
final Network network = new Network(mNetId);
// Also initializes proxy system properties.
cm.setProcessDefaultNetwork(network);
// Proxy system properties must be initialized before setContentView is called because
// setContentView initializes the WebView logic which in turn reads the system properties.
setContentView(R.layout.activity_captive_portal_login);
getActionBar().setDisplayShowHomeEnabled(false);
// Exit app if Network disappears.
final NetworkCapabilities networkCapabilities = cm.getNetworkCapabilities(network);
if (networkCapabilities == null) {
finish();
return;
}
mNetworkCallback = new NetworkCallback() {
@Override
public void onLost(Network lostNetwork) {
if (network.equals(lostNetwork)) done(CAPTIVE_PORTAL_APP_RETURN_UNWANTED);
}
};
final NetworkRequest.Builder builder = new NetworkRequest.Builder();
for (int transportType : networkCapabilities.getTransportTypes()) {
builder.addTransportType(transportType);
}
cm.registerNetworkCallback(builder.build(), mNetworkCallback);
final WebView myWebView = (WebView) findViewById(R.id.webview);
myWebView.clearCache(true);
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
myWebView.setWebViewClient(new MyWebViewClient());
myWebView.setWebChromeClient(new MyWebChromeClient());
// Start initial page load so WebView finishes loading proxy settings.
// Actual load of mUrl is initiated by MyWebViewClient.
myWebView.loadData("", "text/html", null);
}
// Find WebView's proxy BroadcastReceiver and prompt it to read proxy system properties.
private void setWebViewProxy() {
LoadedApk loadedApk = getApplication().mLoadedApk;
try {
Field receiversField = LoadedApk.class.getDeclaredField("mReceivers");
receiversField.setAccessible(true);
ArrayMap receivers = (ArrayMap) receiversField.get(loadedApk);
for (Object receiverMap : receivers.values()) {
for (Object rec : ((ArrayMap) receiverMap).keySet()) {
Class clazz = rec.getClass();
if (clazz.getName().contains("ProxyChangeListener")) {
Method onReceiveMethod = clazz.getDeclaredMethod("onReceive", Context.class,
Intent.class);
Intent intent = new Intent(Proxy.PROXY_CHANGE_ACTION);
onReceiveMethod.invoke(rec, getApplicationContext(), intent);
Log.v(TAG, "Prompting WebView proxy reload.");
}
}
}
} catch (Exception e) {
Log.e(TAG, "Exception while setting WebView proxy: " + e);
}
}
private void done(int result) {
if (mNetworkCallback != null) {
ConnectivityManager.from(this).unregisterNetworkCallback(mNetworkCallback);
}
Intent intent = new Intent(ACTION_CAPTIVE_PORTAL_LOGGED_IN);
intent.putExtra(Intent.EXTRA_TEXT, String.valueOf(mNetId));
intent.putExtra(LOGGED_IN_RESULT, String.valueOf(result));
intent.putExtra(RESPONSE_TOKEN, mResponseToken);
sendBroadcast(intent);
finish();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.captive_portal_login, menu);
return true;
}
@Override
public void onBackPressed() {
WebView myWebView = (WebView) findViewById(R.id.webview);
if (myWebView.canGoBack()) {
myWebView.goBack();
} else {
super.onBackPressed();
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_use_network) {
done(CAPTIVE_PORTAL_APP_RETURN_WANTED_AS_IS);
return true;
}
if (id == R.id.action_do_not_use_network) {
done(CAPTIVE_PORTAL_APP_RETURN_UNWANTED);
return true;
}
return super.onOptionsItemSelected(item);
}
private void testForCaptivePortal() {
new Thread(new Runnable() {
public void run() {
// Give time for captive portal to open.
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
HttpURLConnection urlConnection = null;
int httpResponseCode = 500;
try {
urlConnection = (HttpURLConnection) mURL.openConnection();
urlConnection.setInstanceFollowRedirects(false);
urlConnection.setConnectTimeout(SOCKET_TIMEOUT_MS);
urlConnection.setReadTimeout(SOCKET_TIMEOUT_MS);
urlConnection.setUseCaches(false);
urlConnection.getInputStream();
httpResponseCode = urlConnection.getResponseCode();
} catch (IOException e) {
} finally {
if (urlConnection != null) urlConnection.disconnect();
}
if (httpResponseCode == 204) {
done(CAPTIVE_PORTAL_APP_RETURN_APPEASED);
}
}
}).start();
}
private class MyWebViewClient extends WebViewClient {
private boolean firstPageLoad = true;
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
if (firstPageLoad) return;
testForCaptivePortal();
}
@Override
public void onPageFinished(WebView view, String url) {
if (firstPageLoad) {
firstPageLoad = false;
// Now that WebView has loaded at least one page we know it has read in the proxy
// settings. Now prompt the WebView read the Network-specific proxy settings.
setWebViewProxy();
// Load the real page.
view.loadUrl(mURL.toString());
return;
}
testForCaptivePortal();
}
// A web page consisting of a large broken lock icon to indicate SSL failure.
final static String SSL_ERROR_HTML = "<!DOCTYPE html><html><head><style>" +
"html { width:100%; height:100%; " +
" background:url(locked_page.png) center center no-repeat; }" +
"</style></head><body></body></html>";
@Override
public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
Log.w(TAG, "SSL error; displaying broken lock icon.");
view.loadDataWithBaseURL("file:///android_asset/", SSL_ERROR_HTML, "text/HTML",
"UTF-8", null);
}
}
private class MyWebChromeClient extends WebChromeClient {
@Override
public void onProgressChanged(WebView view, int newProgress) {
ProgressBar myProgressBar = (ProgressBar) findViewById(R.id.progress_bar);
myProgressBar.setProgress(newProgress);
myProgressBar.setVisibility(newProgress == 100 ? View.GONE : View.VISIBLE);
}
}
}
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