| 1 | // Copyright 2013 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | package org.chromium.chromoting; |
| 6 | |
| 7 | import android.accounts.Account; |
| 8 | import android.accounts.AccountManager; |
| 9 | import android.accounts.AccountManagerCallback; |
| 10 | import android.accounts.AccountManagerFuture; |
| 11 | import android.accounts.AuthenticatorException; |
| 12 | import android.accounts.OperationCanceledException; |
| 13 | import android.app.Activity; |
| 14 | import android.content.Context; |
| 15 | import android.content.Intent; |
| 16 | import android.content.SharedPreferences; |
| 17 | import android.os.Bundle; |
| 18 | import android.os.Handler; |
| 19 | import android.os.HandlerThread; |
| 20 | import android.text.Html; |
| 21 | import android.util.Log; |
| 22 | import android.view.Menu; |
| 23 | import android.view.MenuItem; |
| 24 | import android.view.View; |
| 25 | import android.view.ViewGroup; |
| 26 | import android.widget.ArrayAdapter; |
| 27 | import android.widget.TextView; |
| 28 | import android.widget.ListView; |
| 29 | import android.widget.Toast; |
| 30 | |
| 31 | import org.chromium.chromoting.jni.JniInterface; |
| 32 | import org.json.JSONArray; |
| 33 | import org.json.JSONException; |
| 34 | import org.json.JSONObject; |
| 35 | |
| 36 | import java.io.IOException; |
| 37 | import java.net.URL; |
| 38 | import java.net.URLConnection; |
| 39 | import java.util.Scanner; |
| 40 | |
| 41 | /** |
| 42 | * The user interface for querying and displaying a user's host list from the directory server. It |
| 43 | * also requests and renews authentication tokens using the system account manager. |
| 44 | */ |
| 45 | public class Chromoting extends Activity { |
| 46 | /** Only accounts of this type will be selectable for authentication. */ |
| 47 | private static final String ACCOUNT_TYPE = "com.google"; |
| 48 | |
| 49 | /** Scopes at which the authentication token we request will be valid. */ |
| 50 | private static final String TOKEN_SCOPE = "oauth2:https://www.googleapis.com/auth/chromoting " + |
| 51 | "https://www.googleapis.com/auth/googletalk"; |
| 52 | |
| 53 | /** Path from which to download a user's host list JSON object. */ |
| 54 | private static final String HOST_LIST_PATH = |
| 55 | "https://www.googleapis.com/chromoting/v1/@me/hosts?key="; |
| 56 | |
| 57 | /** Color to use for hosts that are online. */ |
| 58 | private static final String HOST_COLOR_ONLINE = "green"; |
| 59 | |
| 60 | /** Color to use for hosts that are offline. */ |
| 61 | private static final String HOST_COLOR_OFFLINE = "red"; |
| 62 | |
| 63 | /** User's account details. */ |
| 64 | private Account mAccount; |
| 65 | |
| 66 | /** Account auth token. */ |
| 67 | private String mToken; |
| 68 | |
| 69 | /** List of hosts. */ |
| 70 | private JSONArray mHosts; |
| 71 | |
| 72 | /** Refresh button. */ |
| 73 | private MenuItem mRefreshButton; |
| 74 | |
| 75 | /** Account switcher. */ |
| 76 | private MenuItem mAccountSwitcher; |
| 77 | |
| 78 | /** Greeting at the top of the displayed list. */ |
| 79 | private TextView mGreeting; |
| 80 | |
| 81 | /** Host list as it appears to the user. */ |
| 82 | private ListView mList; |
| 83 | |
| 84 | /** Callback handler to be used for network operations. */ |
| 85 | private Handler mNetwork; |
| 86 | |
| 87 | /** |
| 88 | * Called when the activity is first created. Loads the native library and requests an |
| 89 | * authentication token from the system. |
| 90 | */ |
| 91 | @Override |
| 92 | public void onCreate(Bundle savedInstanceState) { |
| 93 | super.onCreate(savedInstanceState); |
| 94 | setContentView(R.layout.main); |
| 95 | |
| 96 | // Get ahold of our view widgets. |
| 97 | mGreeting = (TextView)findViewById(R.id.hostList_greeting); |
| 98 | mList = (ListView)findViewById(R.id.hostList_chooser); |
| 99 | |
| 100 | // Bring native components online. |
| 101 | JniInterface.loadLibrary(this); |
| 102 | |
| 103 | // Thread responsible for downloading/displaying host list. |
| 104 | HandlerThread thread = new HandlerThread("auth_callback"); |
| 105 | thread.start(); |
| 106 | mNetwork = new Handler(thread.getLooper()); |
| 107 | |
| 108 | SharedPreferences prefs = getPreferences(MODE_PRIVATE); |
| 109 | if (prefs.contains("account_name") && prefs.contains("account_type")) { |
| 110 | // Perform authentication using saved account selection. |
| 111 | mAccount = new Account(prefs.getString("account_name", null), |
| 112 | prefs.getString("account_type", null)); |
| 113 | AccountManager.get(this).getAuthToken(mAccount, TOKEN_SCOPE, null, this, |
| 114 | new HostListDirectoryGrabber(this), mNetwork); |
| 115 | if (mAccountSwitcher != null) { |
| 116 | mAccountSwitcher.setTitle(mAccount.name); |
| 117 | } |
| 118 | } else { |
| 119 | // Request auth callback once user has chosen an account. |
| 120 | Log.i("auth", "Requesting auth token from system"); |
| 121 | AccountManager.get(this).getAuthTokenByFeatures( |
| 122 | ACCOUNT_TYPE, |
| 123 | TOKEN_SCOPE, |
| 124 | null, |
| 125 | this, |
| 126 | null, |
| 127 | null, |
| 128 | new HostListDirectoryGrabber(this), |
| 129 | mNetwork |
| 130 | ); |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | /** Called when the activity is finally finished. */ |
| 135 | @Override |
| 136 | public void onDestroy() { |
| 137 | super.onDestroy(); |
| 138 | JniInterface.disconnectFromHost(); |
| 139 | } |
| 140 | |
| 141 | /** Called to initialize the action bar. */ |
| 142 | @Override |
| 143 | public boolean onCreateOptionsMenu(Menu menu) { |
| 144 | getMenuInflater().inflate(R.menu.chromoting_actionbar, menu); |
| 145 | mRefreshButton = menu.findItem(R.id.actionbar_directoryrefresh); |
| 146 | mAccountSwitcher = menu.findItem(R.id.actionbar_accountswitcher); |
| 147 | |
| 148 | Account[] usableAccounts = AccountManager.get(this).getAccountsByType(ACCOUNT_TYPE); |
| 149 | if (usableAccounts.length == 1 && usableAccounts[0].equals(mAccount)) { |
| 150 | // If we're using the only available account, don't offer account switching. |
| 151 | // (If there are *no* accounts available, clicking this allows you to add a new one.) |
| 152 | mAccountSwitcher.setEnabled(false); |
| 153 | } |
| 154 | |
| 155 | if (mAccount == null) { |
| 156 | // If no account has been chosen, don't allow the user to refresh the listing. |
| 157 | mRefreshButton.setEnabled(false); |
| 158 | } else { |
| 159 | // If the user has picked an account, show its name directly on the account switcher. |
| 160 | mAccountSwitcher.setTitle(mAccount.name); |
| 161 | } |
| 162 | |
| 163 | return super.onCreateOptionsMenu(menu); |
| 164 | } |
| 165 | |
| 166 | /** Called whenever an action bar button is pressed. */ |
| 167 | @Override |
| 168 | public boolean onOptionsItemSelected(MenuItem item) { |
| 169 | if (item == mAccountSwitcher) { |
| 170 | // The account switcher triggers a listing of all available accounts. |
| 171 | AccountManager.get(this).getAuthTokenByFeatures( |
| 172 | ACCOUNT_TYPE, |
| 173 | TOKEN_SCOPE, |
| 174 | null, |
| 175 | this, |
| 176 | null, |
| 177 | null, |
| 178 | new HostListDirectoryGrabber(this), |
| 179 | mNetwork |
| 180 | ); |
| 181 | } |
| 182 | else { |
| 183 | // The refresh button simply makes use of the currently-chosen account. |
| 184 | AccountManager.get(this).getAuthToken(mAccount, TOKEN_SCOPE, null, this, |
| 185 | new HostListDirectoryGrabber(this), mNetwork); |
| 186 | } |
| 187 | |
| 188 | return true; |
| 189 | } |
| 190 | |
| 191 | /** |
| 192 | * Processes the authentication token once the system provides it. Once in possession of such a |
| 193 | * token, attempts to request a host list from the directory server. In case of a bad response, |
| 194 | * this is retried once in case the system's cached auth token had expired. |
| 195 | */ |
| 196 | private class HostListDirectoryGrabber implements AccountManagerCallback<Bundle> { |
| 197 | /** Whether authentication has already been attempted. */ |
| 198 | private boolean mAlreadyTried; |
| 199 | |
| 200 | /** Communication with the screen. */ |
| 201 | private Activity mUi; |
| 202 | |
| 203 | /** Constructor. */ |
| 204 | public HostListDirectoryGrabber(Activity ui) { |
| 205 | mAlreadyTried = false; |
| 206 | mUi = ui; |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * Retrieves the host list from the directory server. This method performs |
| 211 | * network operations and must be run an a non-UI thread. |
| 212 | */ |
| 213 | @Override |
| 214 | public void run(AccountManagerFuture<Bundle> future) { |
| 215 | Log.i("auth", "User finished with auth dialogs"); |
| 216 | try { |
| 217 | // Here comes our auth token from the Android system. |
| 218 | Bundle result = future.getResult(); |
| 219 | String accountName = result.getString(AccountManager.KEY_ACCOUNT_NAME); |
| 220 | String accountType = result.getString(AccountManager.KEY_ACCOUNT_TYPE); |
| 221 | String authToken = result.getString(AccountManager.KEY_AUTHTOKEN); |
| 222 | Log.i("auth", "Received an auth token from system"); |
| 223 | |
| 224 | synchronized (mUi) { |
| 225 | mAccount = new Account(accountName, accountType); |
| 226 | mToken = authToken; |
| 227 | getPreferences(MODE_PRIVATE).edit().putString("account_name", accountName). |
| 228 | putString("account_type", accountType).apply(); |
| 229 | } |
| 230 | |
| 231 | // Send our HTTP request to the directory server. |
| 232 | URLConnection link = |
| 233 | new URL(HOST_LIST_PATH + JniInterface.getApiKey()).openConnection(); |
| 234 | link.addRequestProperty("client_id", JniInterface.getClientId()); |
| 235 | link.addRequestProperty("client_secret", JniInterface.getClientSecret()); |
| 236 | link.setRequestProperty("Authorization", "OAuth " + authToken); |
| 237 | |
| 238 | // Listen for the server to respond. |
| 239 | StringBuilder response = new StringBuilder(); |
| 240 | Scanner incoming = new Scanner(link.getInputStream()); |
| 241 | Log.i("auth", "Successfully authenticated to directory server"); |
| 242 | while (incoming.hasNext()) { |
| 243 | response.append(incoming.nextLine()); |
| 244 | } |
| 245 | incoming.close(); |
| 246 | |
| 247 | // Interpret what the directory server told us. |
| 248 | JSONObject data = new JSONObject(String.valueOf(response)).getJSONObject("data"); |
| 249 | mHosts = data.getJSONArray("items"); |
| 250 | Log.i("hostlist", "Received host listing from directory server"); |
| 251 | } catch (RuntimeException ex) { |
| 252 | // Make sure any other failure is reported to the user (as an unknown error). |
| 253 | throw ex; |
| 254 | } catch (Exception ex) { |
| 255 | // Assemble error message to display to the user. |
| 256 | String explanation = getString(R.string.error_unknown); |
| 257 | if (ex instanceof OperationCanceledException) { |
| 258 | explanation = getString(R.string.error_auth_canceled); |
| 259 | } else if (ex instanceof AuthenticatorException) { |
| 260 | explanation = getString(R.string.error_no_accounts); |
| 261 | } else if (ex instanceof IOException) { |
| 262 | if (!mAlreadyTried) { |
| 263 | // This was our first connection attempt. |
| 264 | |
| 265 | synchronized (mUi) { |
| 266 | if (mAccount != null) { |
| 267 | // We got an account, but couldn't log into it. We'll retry in case |
| 268 | // the system's cached authentication token had already expired. |
| 269 | AccountManager authenticator = AccountManager.get(mUi); |
| 270 | mAlreadyTried = true; |
| 271 | |
| 272 | Log.w("auth", "Requesting renewal of rejected auth token"); |
| 273 | authenticator.invalidateAuthToken(mAccount.type, mToken); |
| 274 | mToken = null; |
| 275 | authenticator.getAuthToken( |
| 276 | mAccount, TOKEN_SCOPE, null, mUi, this, mNetwork); |
| 277 | |
| 278 | // We're not in an error state *yet*. |
| 279 | return; |
| 280 | } |
| 281 | } |
| 282 | |
| 283 | // We didn't even get an account, so the auth server is likely unreachable. |
| 284 | explanation = getString(R.string.error_bad_connection); |
| 285 | } else { |
| 286 | // Authentication truly failed. |
| 287 | Log.e("auth", "Fresh auth token was also rejected"); |
| 288 | explanation = getString(R.string.error_auth_failed); |
| 289 | } |
| 290 | } else if (ex instanceof JSONException) { |
| 291 | explanation = getString(R.string.error_unexpected_response); |
| 292 | runOnUiThread(new HostListDisplayer(mUi)); |
| 293 | } |
| 294 | |
| 295 | mHosts = null; |
| 296 | Log.w("auth", ex); |
| 297 | Toast.makeText(mUi, explanation, Toast.LENGTH_LONG).show(); |
| 298 | } |
| 299 | |
| 300 | // Share our findings with the user. |
| 301 | runOnUiThread(new HostListDisplayer(mUi)); |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | /** Formats the host list and offers it to the user. */ |
| 306 | private class HostListDisplayer implements Runnable { |
| 307 | /** Communication with the screen. */ |
| 308 | private Activity mUi; |
| 309 | |
| 310 | /** Constructor. */ |
| 311 | public HostListDisplayer(Activity ui) { |
| 312 | mUi = ui; |
| 313 | } |
| 314 | |
| 315 | /** |
| 316 | * Updates the infotext and host list display. |
| 317 | * This method affects the UI and must be run on its same thread. |
| 318 | */ |
| 319 | @Override |
| 320 | public void run() { |
| 321 | synchronized (mUi) { |
| 322 | mRefreshButton.setEnabled(mAccount != null); |
| 323 | if (mAccount != null) { |
| 324 | mAccountSwitcher.setTitle(mAccount.name); |
| 325 | } |
| 326 | } |
| 327 | |
| 328 | if (mHosts == null) { |
| 329 | mGreeting.setText(getString(R.string.inst_empty_list)); |
| 330 | mList.setAdapter(null); |
| 331 | return; |
| 332 | } |
| 333 | |
| 334 | mGreeting.setText(getString(R.string.inst_host_list)); |
| 335 | |
| 336 | ArrayAdapter<JSONObject> displayer = new HostListAdapter(mUi, R.layout.host); |
| 337 | Log.i("hostlist", "About to populate host list display"); |
| 338 | try { |
| 339 | int index = 0; |
| 340 | while (!mHosts.isNull(index)) { |
| 341 | displayer.add(mHosts.getJSONObject(index)); |
| 342 | ++index; |
| 343 | } |
| 344 | mList.setAdapter(displayer); |
| 345 | } |
| 346 | catch(JSONException ex) { |
| 347 | Log.w("hostlist", ex); |
| 348 | Toast.makeText( |
| 349 | mUi, getString(R.string.error_cataloging_hosts), Toast.LENGTH_LONG).show(); |
| 350 | |
| 351 | // Close the application. |
| 352 | finish(); |
| 353 | } |
| 354 | } |
| 355 | } |
| 356 | |
| 357 | /** Describes the appearance and behavior of each host list entry. */ |
| 358 | private class HostListAdapter extends ArrayAdapter<JSONObject> { |
| 359 | /** Constructor. */ |
| 360 | public HostListAdapter(Context context, int textViewResourceId) { |
| 361 | super(context, textViewResourceId); |
| 362 | } |
| 363 | |
| 364 | /** Generates a View corresponding to this particular host. */ |
| 365 | @Override |
| 366 | public View getView(int position, View convertView, ViewGroup parent) { |
| 367 | TextView target = (TextView)super.getView(position, convertView, parent); |
| 368 | |
| 369 | try { |
| 370 | final JSONObject host = getItem(position); |
| 371 | target.setText(Html.fromHtml(host.getString("hostName") + " (<font color = \"" + |
| 372 | (host.getString("status").equals("ONLINE") ? HOST_COLOR_ONLINE : |
| 373 | HOST_COLOR_OFFLINE) + "\">" + host.getString("status") + "</font>)")); |
| 374 | |
| 375 | if (host.getString("status").equals("ONLINE")) { // Host is online. |
| 376 | target.setOnClickListener(new View.OnClickListener() { |
| 377 | @Override |
| 378 | public void onClick(View v) { |
| 379 | try { |
| 380 | synchronized (getContext()) { |
| 381 | JniInterface.connectToHost(mAccount.name, mToken, |
| 382 | host.getString("jabberId"), |
| 383 | host.getString("hostId"), |
| 384 | host.getString("publicKey"), |
| 385 | new Runnable() { |
| 386 | @Override |
| 387 | public void run() { |
| 388 | startActivity( |
| 389 | new Intent(getContext(), Desktop.class)); |
| 390 | } |
| 391 | }); |
| 392 | } |
| 393 | } |
| 394 | catch(JSONException ex) { |
| 395 | Log.w("host", ex); |
| 396 | Toast.makeText(getContext(), |
| 397 | getString(R.string.error_reading_host), |
| 398 | Toast.LENGTH_LONG).show(); |
| 399 | |
| 400 | // Close the application. |
| 401 | finish(); |
| 402 | } |
| 403 | } |
| 404 | }); |
| 405 | } else { // Host is offline. |
| 406 | // Disallow interaction with this entry. |
| 407 | target.setEnabled(false); |
| 408 | } |
| 409 | } |
| 410 | catch(JSONException ex) { |
| 411 | Log.w("hostlist", ex); |
| 412 | Toast.makeText(getContext(), |
| 413 | getString(R.string.error_displaying_host), |
| 414 | Toast.LENGTH_LONG).show(); |
| 415 | |
| 416 | // Close the application. |
| 417 | finish(); |
| 418 | } |
| 419 | |
| 420 | return target; |
| 421 | } |
| 422 | } |
| 423 | } |