1/* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package com.android.captiveportallogin; 18 19import android.app.Activity; 20import android.app.LoadedApk; 21import android.content.Context; 22import android.content.Intent; 23import android.graphics.Bitmap; 24import android.net.CaptivePortal; 25import android.net.ConnectivityManager; 26import android.net.ConnectivityManager.NetworkCallback; 27import android.net.Network; 28import android.net.NetworkCapabilities; 29import android.net.NetworkRequest; 30import android.net.Proxy; 31import android.net.Uri; 32import android.net.http.SslError; 33import android.os.Bundle; 34import android.provider.Settings; 35import android.util.ArrayMap; 36import android.util.Log; 37import android.util.TypedValue; 38import android.view.Menu; 39import android.view.MenuItem; 40import android.webkit.SslErrorHandler; 41import android.webkit.WebChromeClient; 42import android.webkit.WebSettings; 43import android.webkit.WebView; 44import android.webkit.WebViewClient; 45import android.widget.ProgressBar; 46import android.widget.TextView; 47 48import java.io.IOException; 49import java.net.HttpURLConnection; 50import java.net.MalformedURLException; 51import java.net.URL; 52import java.lang.InterruptedException; 53import java.lang.reflect.Field; 54import java.lang.reflect.Method; 55import java.util.Random; 56 57public class CaptivePortalLoginActivity extends Activity { 58 private static final String TAG = "CaptivePortalLogin"; 59 private static final int SOCKET_TIMEOUT_MS = 10000; 60 61 private enum Result { DISMISSED, UNWANTED, WANTED_AS_IS }; 62 63 private URL mURL; 64 private Network mNetwork; 65 private CaptivePortal mCaptivePortal; 66 private NetworkCallback mNetworkCallback; 67 private ConnectivityManager mCm; 68 private boolean mLaunchBrowser = false; 69 private MyWebViewClient mWebViewClient; 70 71 @Override 72 protected void onCreate(Bundle savedInstanceState) { 73 super.onCreate(savedInstanceState); 74 mCm = ConnectivityManager.from(this); 75 String url = getIntent().getStringExtra(ConnectivityManager.EXTRA_CAPTIVE_PORTAL_URL); 76 if (url == null) url = mCm.getCaptivePortalServerUrl(); 77 try { 78 mURL = new URL(url); 79 } catch (MalformedURLException e) { 80 // System misconfigured, bail out in a way that at least provides network access. 81 Log.e(TAG, "Invalid captive portal URL, url=" + url); 82 done(Result.WANTED_AS_IS); 83 } 84 mNetwork = getIntent().getParcelableExtra(ConnectivityManager.EXTRA_NETWORK); 85 mCaptivePortal = getIntent().getParcelableExtra(ConnectivityManager.EXTRA_CAPTIVE_PORTAL); 86 87 // Also initializes proxy system properties. 88 mCm.bindProcessToNetwork(mNetwork); 89 90 // Proxy system properties must be initialized before setContentView is called because 91 // setContentView initializes the WebView logic which in turn reads the system properties. 92 setContentView(R.layout.activity_captive_portal_login); 93 94 getActionBar().setDisplayShowHomeEnabled(false); 95 96 // Exit app if Network disappears. 97 final NetworkCapabilities networkCapabilities = mCm.getNetworkCapabilities(mNetwork); 98 if (networkCapabilities == null) { 99 finish(); 100 return; 101 } 102 mNetworkCallback = new NetworkCallback() { 103 @Override 104 public void onLost(Network lostNetwork) { 105 if (mNetwork.equals(lostNetwork)) done(Result.UNWANTED); 106 } 107 }; 108 final NetworkRequest.Builder builder = new NetworkRequest.Builder(); 109 for (int transportType : networkCapabilities.getTransportTypes()) { 110 builder.addTransportType(transportType); 111 } 112 mCm.registerNetworkCallback(builder.build(), mNetworkCallback); 113 114 final WebView myWebView = (WebView) findViewById(R.id.webview); 115 myWebView.clearCache(true); 116 WebSettings webSettings = myWebView.getSettings(); 117 webSettings.setJavaScriptEnabled(true); 118 mWebViewClient = new MyWebViewClient(); 119 myWebView.setWebViewClient(mWebViewClient); 120 myWebView.setWebChromeClient(new MyWebChromeClient()); 121 // Start initial page load so WebView finishes loading proxy settings. 122 // Actual load of mUrl is initiated by MyWebViewClient. 123 myWebView.loadData("", "text/html", null); 124 } 125 126 // Find WebView's proxy BroadcastReceiver and prompt it to read proxy system properties. 127 private void setWebViewProxy() { 128 LoadedApk loadedApk = getApplication().mLoadedApk; 129 try { 130 Field receiversField = LoadedApk.class.getDeclaredField("mReceivers"); 131 receiversField.setAccessible(true); 132 ArrayMap receivers = (ArrayMap) receiversField.get(loadedApk); 133 for (Object receiverMap : receivers.values()) { 134 for (Object rec : ((ArrayMap) receiverMap).keySet()) { 135 Class clazz = rec.getClass(); 136 if (clazz.getName().contains("ProxyChangeListener")) { 137 Method onReceiveMethod = clazz.getDeclaredMethod("onReceive", Context.class, 138 Intent.class); 139 Intent intent = new Intent(Proxy.PROXY_CHANGE_ACTION); 140 onReceiveMethod.invoke(rec, getApplicationContext(), intent); 141 Log.v(TAG, "Prompting WebView proxy reload."); 142 } 143 } 144 } 145 } catch (Exception e) { 146 Log.e(TAG, "Exception while setting WebView proxy: " + e); 147 } 148 } 149 150 private void done(Result result) { 151 if (mNetworkCallback != null) { 152 mCm.unregisterNetworkCallback(mNetworkCallback); 153 mNetworkCallback = null; 154 } 155 switch (result) { 156 case DISMISSED: 157 mCaptivePortal.reportCaptivePortalDismissed(); 158 break; 159 case UNWANTED: 160 mCaptivePortal.ignoreNetwork(); 161 break; 162 case WANTED_AS_IS: 163 mCaptivePortal.useNetwork(); 164 break; 165 } 166 finish(); 167 } 168 169 @Override 170 public boolean onCreateOptionsMenu(Menu menu) { 171 getMenuInflater().inflate(R.menu.captive_portal_login, menu); 172 return true; 173 } 174 175 @Override 176 public void onBackPressed() { 177 WebView myWebView = (WebView) findViewById(R.id.webview); 178 if (myWebView.canGoBack() && mWebViewClient.allowBack()) { 179 myWebView.goBack(); 180 } else { 181 super.onBackPressed(); 182 } 183 } 184 185 @Override 186 public boolean onOptionsItemSelected(MenuItem item) { 187 int id = item.getItemId(); 188 if (id == R.id.action_use_network) { 189 done(Result.WANTED_AS_IS); 190 return true; 191 } 192 if (id == R.id.action_do_not_use_network) { 193 done(Result.UNWANTED); 194 return true; 195 } 196 return super.onOptionsItemSelected(item); 197 } 198 199 @Override 200 public void onDestroy() { 201 super.onDestroy(); 202 203 if (mNetworkCallback != null) { 204 mCm.unregisterNetworkCallback(mNetworkCallback); 205 mNetworkCallback = null; 206 } 207 if (mLaunchBrowser) { 208 // Give time for this network to become default. After 500ms just proceed. 209 for (int i = 0; i < 5; i++) { 210 // TODO: This misses when mNetwork underlies a VPN. 211 if (mNetwork.equals(mCm.getActiveNetwork())) break; 212 try { 213 Thread.sleep(100); 214 } catch (InterruptedException e) { 215 } 216 } 217 startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(mURL.toString()))); 218 } 219 } 220 221 private void testForCaptivePortal() { 222 new Thread(new Runnable() { 223 public void run() { 224 // Give time for captive portal to open. 225 try { 226 Thread.sleep(1000); 227 } catch (InterruptedException e) { 228 } 229 HttpURLConnection urlConnection = null; 230 int httpResponseCode = 500; 231 try { 232 urlConnection = (HttpURLConnection) mURL.openConnection(); 233 urlConnection.setInstanceFollowRedirects(false); 234 urlConnection.setConnectTimeout(SOCKET_TIMEOUT_MS); 235 urlConnection.setReadTimeout(SOCKET_TIMEOUT_MS); 236 urlConnection.setUseCaches(false); 237 urlConnection.getInputStream(); 238 httpResponseCode = urlConnection.getResponseCode(); 239 } catch (IOException e) { 240 } finally { 241 if (urlConnection != null) urlConnection.disconnect(); 242 } 243 if (httpResponseCode == 204) { 244 done(Result.DISMISSED); 245 } 246 } 247 }).start(); 248 } 249 250 private class MyWebViewClient extends WebViewClient { 251 private static final String INTERNAL_ASSETS = "file:///android_asset/"; 252 private final String mBrowserBailOutToken = Long.toString(new Random().nextLong()); 253 // How many Android device-independent-pixels per scaled-pixel 254 // dp/sp = (px/sp) / (px/dp) = (1/sp) / (1/dp) 255 private final float mDpPerSp = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 1, 256 getResources().getDisplayMetrics()) / 257 TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 1, 258 getResources().getDisplayMetrics()); 259 private int mPagesLoaded; 260 261 // If we haven't finished cleaning up the history, don't allow going back. 262 public boolean allowBack() { 263 return mPagesLoaded > 1; 264 } 265 266 @Override 267 public void onPageStarted(WebView view, String url, Bitmap favicon) { 268 if (url.contains(mBrowserBailOutToken)) { 269 mLaunchBrowser = true; 270 done(Result.WANTED_AS_IS); 271 return; 272 } 273 // The first page load is used only to cause the WebView to 274 // fetch the proxy settings. Don't update the URL bar, and 275 // don't check if the captive portal is still there. 276 if (mPagesLoaded == 0) return; 277 // For internally generated pages, leave URL bar listing prior URL as this is the URL 278 // the page refers to. 279 if (!url.startsWith(INTERNAL_ASSETS)) { 280 final TextView myUrlBar = (TextView) findViewById(R.id.url_bar); 281 myUrlBar.setText(url); 282 } 283 testForCaptivePortal(); 284 } 285 286 @Override 287 public void onPageFinished(WebView view, String url) { 288 mPagesLoaded++; 289 if (mPagesLoaded == 1) { 290 // Now that WebView has loaded at least one page we know it has read in the proxy 291 // settings. Now prompt the WebView read the Network-specific proxy settings. 292 setWebViewProxy(); 293 // Load the real page. 294 view.loadUrl(mURL.toString()); 295 return; 296 } else if (mPagesLoaded == 2) { 297 // Prevent going back to empty first page. 298 view.clearHistory(); 299 } 300 testForCaptivePortal(); 301 } 302 303 // Convert Android device-independent-pixels (dp) to HTML size. 304 private String dp(int dp) { 305 // HTML px's are scaled just like dp's, so just add "px" suffix. 306 return Integer.toString(dp) + "px"; 307 } 308 309 // Convert Android scaled-pixels (sp) to HTML size. 310 private String sp(int sp) { 311 // Convert sp to dp's. 312 float dp = sp * mDpPerSp; 313 // Apply a scale factor to make things look right. 314 dp *= 1.3; 315 // Convert dp's to HTML size. 316 return dp((int)dp); 317 } 318 319 // A web page consisting of a large broken lock icon to indicate SSL failure. 320 private final String SSL_ERROR_HTML = "<html><head><style>" + 321 "body { margin-left:" + dp(48) + "; margin-right:" + dp(48) + "; " + 322 "margin-top:" + dp(96) + "; background-color:#fafafa; }" + 323 "img { width:" + dp(48) + "; height:" + dp(48) + "; }" + 324 "div.warn { font-size:" + sp(16) + "; margin-top:" + dp(16) + "; " + 325 " opacity:0.87; line-height:1.28; }" + 326 "div.example { font-size:" + sp(14) + "; margin-top:" + dp(16) + "; " + 327 " opacity:0.54; line-height:1.21905; }" + 328 "a { font-size:" + sp(14) + "; text-decoration:none; text-transform:uppercase; " + 329 " margin-top:" + dp(24) + "; display:inline-block; color:#4285F4; " + 330 " height:" + dp(48) + "; font-weight:bold; }" + 331 "</style></head><body><p><img src=quantum_ic_warning_amber_96.png><br>" + 332 "<div class=warn>%s</div>" + 333 "<div class=example>%s</div>" + 334 "<a href=%s>%s</a></body></html>"; 335 336 @Override 337 public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) { 338 Log.w(TAG, "SSL error (error: " + error.getPrimaryError() + " host: " + 339 // Only show host to avoid leaking private info. 340 Uri.parse(error.getUrl()).getHost() + " certificate: " + 341 error.getCertificate() + "); displaying SSL warning."); 342 final String html = String.format(SSL_ERROR_HTML, getString(R.string.ssl_error_warning), 343 getString(R.string.ssl_error_example), mBrowserBailOutToken, 344 getString(R.string.ssl_error_continue)); 345 view.loadDataWithBaseURL(INTERNAL_ASSETS, html, "text/HTML", "UTF-8", null); 346 } 347 348 @Override 349 public boolean shouldOverrideUrlLoading (WebView view, String url) { 350 if (url.startsWith("tel:")) { 351 startActivity(new Intent(Intent.ACTION_DIAL, Uri.parse(url))); 352 return true; 353 } 354 return false; 355 } 356 } 357 358 private class MyWebChromeClient extends WebChromeClient { 359 @Override 360 public void onProgressChanged(WebView view, int newProgress) { 361 final ProgressBar myProgressBar = (ProgressBar) findViewById(R.id.progress_bar); 362 myProgressBar.setProgress(newProgress); 363 } 364 } 365} 366