CaptivePortalLoginActivity.java revision 65636fb23c86e546dc4ce584481fa58bf72e4945
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.ConnectivityManager; 25import android.net.ConnectivityManager.NetworkCallback; 26import android.net.Network; 27import android.net.NetworkCapabilities; 28import android.net.NetworkRequest; 29import android.net.Proxy; 30import android.net.Uri; 31import android.net.http.SslError; 32import android.os.Bundle; 33import android.provider.Settings; 34import android.util.ArrayMap; 35import android.util.Log; 36import android.util.TypedValue; 37import android.view.Menu; 38import android.view.MenuItem; 39import android.webkit.SslErrorHandler; 40import android.webkit.WebChromeClient; 41import android.webkit.WebSettings; 42import android.webkit.WebView; 43import android.webkit.WebViewClient; 44import android.widget.ProgressBar; 45import android.widget.TextView; 46 47import java.io.IOException; 48import java.net.HttpURLConnection; 49import java.net.MalformedURLException; 50import java.net.URL; 51import java.lang.InterruptedException; 52import java.lang.reflect.Field; 53import java.lang.reflect.Method; 54import java.util.Random; 55 56public class CaptivePortalLoginActivity extends Activity { 57 private static final String TAG = "CaptivePortalLogin"; 58 private static final String DEFAULT_SERVER = "connectivitycheck.android.com"; 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 String mResponseToken; 66 private NetworkCallback mNetworkCallback; 67 private ConnectivityManager mCm; 68 private boolean mLaunchBrowser = false; 69 70 @Override 71 protected void onCreate(Bundle savedInstanceState) { 72 super.onCreate(savedInstanceState); 73 74 String server = Settings.Global.getString(getContentResolver(), "captive_portal_server"); 75 if (server == null) server = DEFAULT_SERVER; 76 mCm = ConnectivityManager.from(this); 77 try { 78 mURL = new URL("http", server, "/generate_204"); 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, server=" + server); 82 done(Result.WANTED_AS_IS); 83 } 84 mNetwork = getIntent().getParcelableExtra(ConnectivityManager.EXTRA_NETWORK); 85 mResponseToken = getIntent().getStringExtra(ConnectivityManager.EXTRA_CAPTIVE_PORTAL_TOKEN); 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 myWebView.setWebViewClient(new MyWebViewClient()); 119 myWebView.setWebChromeClient(new MyWebChromeClient()); 120 // Start initial page load so WebView finishes loading proxy settings. 121 // Actual load of mUrl is initiated by MyWebViewClient. 122 myWebView.loadData("", "text/html", null); 123 } 124 125 // Find WebView's proxy BroadcastReceiver and prompt it to read proxy system properties. 126 private void setWebViewProxy() { 127 LoadedApk loadedApk = getApplication().mLoadedApk; 128 try { 129 Field receiversField = LoadedApk.class.getDeclaredField("mReceivers"); 130 receiversField.setAccessible(true); 131 ArrayMap receivers = (ArrayMap) receiversField.get(loadedApk); 132 for (Object receiverMap : receivers.values()) { 133 for (Object rec : ((ArrayMap) receiverMap).keySet()) { 134 Class clazz = rec.getClass(); 135 if (clazz.getName().contains("ProxyChangeListener")) { 136 Method onReceiveMethod = clazz.getDeclaredMethod("onReceive", Context.class, 137 Intent.class); 138 Intent intent = new Intent(Proxy.PROXY_CHANGE_ACTION); 139 onReceiveMethod.invoke(rec, getApplicationContext(), intent); 140 Log.v(TAG, "Prompting WebView proxy reload."); 141 } 142 } 143 } 144 } catch (Exception e) { 145 Log.e(TAG, "Exception while setting WebView proxy: " + e); 146 } 147 } 148 149 private void done(Result result) { 150 if (mNetworkCallback != null) { 151 mCm.unregisterNetworkCallback(mNetworkCallback); 152 mNetworkCallback = null; 153 } 154 switch (result) { 155 case DISMISSED: 156 mCm.reportCaptivePortalDismissed(mNetwork, mResponseToken); 157 break; 158 case UNWANTED: 159 mCm.ignoreNetworkWithCaptivePortal(mNetwork, mResponseToken); 160 break; 161 case WANTED_AS_IS: 162 mCm.useNetworkWithCaptivePortal(mNetwork, mResponseToken); 163 break; 164 } 165 finish(); 166 } 167 168 @Override 169 public boolean onCreateOptionsMenu(Menu menu) { 170 getMenuInflater().inflate(R.menu.captive_portal_login, menu); 171 return true; 172 } 173 174 @Override 175 public void onBackPressed() { 176 WebView myWebView = (WebView) findViewById(R.id.webview); 177 if (myWebView.canGoBack()) { 178 myWebView.goBack(); 179 } else { 180 super.onBackPressed(); 181 } 182 } 183 184 @Override 185 public boolean onOptionsItemSelected(MenuItem item) { 186 int id = item.getItemId(); 187 if (id == R.id.action_use_network) { 188 done(Result.WANTED_AS_IS); 189 return true; 190 } 191 if (id == R.id.action_do_not_use_network) { 192 done(Result.UNWANTED); 193 return true; 194 } 195 return super.onOptionsItemSelected(item); 196 } 197 198 @Override 199 public void onDestroy() { 200 super.onDestroy(); 201 202 if (mNetworkCallback != null) { 203 mCm.unregisterNetworkCallback(mNetworkCallback); 204 mNetworkCallback = null; 205 } 206 if (mLaunchBrowser) { 207 // Give time for this network to become default. After 500ms just proceed. 208 for (int i = 0; i < 5; i++) { 209 // TODO: This misses when mNetwork underlies a VPN. 210 if (mNetwork.equals(mCm.getActiveNetwork())) break; 211 try { 212 Thread.sleep(100); 213 } catch (InterruptedException e) { 214 } 215 } 216 startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(mURL.toString()))); 217 } 218 } 219 220 private void testForCaptivePortal() { 221 new Thread(new Runnable() { 222 public void run() { 223 // Give time for captive portal to open. 224 try { 225 Thread.sleep(1000); 226 } catch (InterruptedException e) { 227 } 228 HttpURLConnection urlConnection = null; 229 int httpResponseCode = 500; 230 try { 231 urlConnection = (HttpURLConnection) mURL.openConnection(); 232 urlConnection.setInstanceFollowRedirects(false); 233 urlConnection.setConnectTimeout(SOCKET_TIMEOUT_MS); 234 urlConnection.setReadTimeout(SOCKET_TIMEOUT_MS); 235 urlConnection.setUseCaches(false); 236 urlConnection.getInputStream(); 237 httpResponseCode = urlConnection.getResponseCode(); 238 } catch (IOException e) { 239 } finally { 240 if (urlConnection != null) urlConnection.disconnect(); 241 } 242 if (httpResponseCode == 204) { 243 done(Result.DISMISSED); 244 } 245 } 246 }).start(); 247 } 248 249 private class MyWebViewClient extends WebViewClient { 250 private static final String INTERNAL_ASSETS = "file:///android_asset/"; 251 private final String mBrowserBailOutToken = Long.toString(new Random().nextLong()); 252 // How many Android device-independent-pixels per scaled-pixel 253 // dp/sp = (px/sp) / (px/dp) = (1/sp) / (1/dp) 254 private final float mDpPerSp = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 1, 255 getResources().getDisplayMetrics()) / 256 TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 1, 257 getResources().getDisplayMetrics()); 258 private boolean mFirstPageLoad = true; 259 260 @Override 261 public void onPageStarted(WebView view, String url, Bitmap favicon) { 262 if (url.contains(mBrowserBailOutToken)) { 263 mLaunchBrowser = true; 264 done(Result.WANTED_AS_IS); 265 return; 266 } 267 if (mFirstPageLoad) return; 268 testForCaptivePortal(); 269 } 270 271 @Override 272 public void onPageFinished(WebView view, String url) { 273 if (mFirstPageLoad) { 274 mFirstPageLoad = false; 275 // Now that WebView has loaded at least one page we know it has read in the proxy 276 // settings. Now prompt the WebView read the Network-specific proxy settings. 277 setWebViewProxy(); 278 // Load the real page. 279 view.loadUrl(mURL.toString()); 280 return; 281 } 282 // For internally generated pages, leave URL bar listing prior URL as this is the URL 283 // the page refers to. 284 if (!url.startsWith(INTERNAL_ASSETS)) { 285 final TextView myUrlBar = (TextView) findViewById(R.id.url_bar); 286 myUrlBar.setText(url); 287 } 288 testForCaptivePortal(); 289 } 290 291 // Convert Android device-independent-pixels (dp) to HTML size. 292 private String dp(int dp) { 293 // HTML px's are scaled just like dp's, so just add "px" suffix. 294 return Integer.toString(dp) + "px"; 295 } 296 297 // Convert Android scaled-pixels (sp) to HTML size. 298 private String sp(int sp) { 299 // Convert sp to dp's. 300 float dp = sp * mDpPerSp; 301 // Apply a scale factor to make things look right. 302 dp *= 1.3; 303 // Convert dp's to HTML size. 304 return dp((int)dp); 305 } 306 307 // A web page consisting of a large broken lock icon to indicate SSL failure. 308 private final String SSL_ERROR_HTML = "<html><head><style>" + 309 "body { margin-left:" + dp(48) + "; margin-right:" + dp(48) + "; " + 310 "margin-top:" + dp(96) + "; background-color:#fafafa; }" + 311 "img { width:" + dp(48) + "; height:" + dp(48) + "; }" + 312 "div.warn { font-size:" + sp(16) + "; margin-top:" + dp(16) + "; " + 313 " opacity:0.87; line-height:1.28; }" + 314 "div.example { font-size:" + sp(14) + "; margin-top:" + dp(16) + "; " + 315 " opacity:0.54; line-height:1.21905; }" + 316 "a { font-size:" + sp(14) + "; text-decoration:none; text-transform:uppercase; " + 317 " margin-top:" + dp(24) + "; display:inline-block; color:#4285F4; " + 318 " height:" + dp(48) + "; font-weight:bold; }" + 319 "</style></head><body><p><img src=quantum_ic_warning_amber_96.png><br>" + 320 "<div class=warn>%s</div>" + 321 "<div class=example>%s</div>" + 322 "<a href=%s>%s</a></body></html>"; 323 324 @Override 325 public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) { 326 Log.w(TAG, "SSL error; displaying SSL warning."); 327 final String html = String.format(SSL_ERROR_HTML, getString(R.string.ssl_error_warning), 328 getString(R.string.ssl_error_example), mBrowserBailOutToken, 329 getString(R.string.ssl_error_continue)); 330 view.loadDataWithBaseURL(INTERNAL_ASSETS, html, "text/HTML", "UTF-8", null); 331 } 332 } 333 334 private class MyWebChromeClient extends WebChromeClient { 335 @Override 336 public void onProgressChanged(WebView view, int newProgress) { 337 final ProgressBar myProgressBar = (ProgressBar) findViewById(R.id.progress_bar); 338 myProgressBar.setProgress(newProgress); 339 } 340 } 341} 342