src/com/owncloud/android/authentication/AuthenticatorActivity.java

   1 /* ownCloud Android client application
   2  *   Copyright (C) 2012  Bartek Przybylski
   3  *   Copyright (C) 2012-2013 ownCloud Inc.
   4  *
   5  *   This program is free software: you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License version 2,
   7  *   as published by the Free Software Foundation.
   8  *
   9  *   This program is distributed in the hope that it will be useful,
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *   GNU General Public License for more details.
  13  *
  14  *   You should have received a copy of the GNU General Public License
  15  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  *
  17  */
  18
  19 package com.owncloud.android.authentication;
  20
  21 import com.owncloud.android.AccountUtils;
  22 import com.owncloud.android.Log_OC;
  23 import com.owncloud.android.ui.dialog.SslValidatorDialog;
  24 import com.owncloud.android.ui.dialog.SslValidatorDialog.OnSslValidatorListener;
  25 import com.owncloud.android.utils.OwnCloudVersion;
  26 import com.owncloud.android.network.OwnCloudClientUtils;
  27 import com.owncloud.android.operations.OwnCloudServerCheckOperation;
  28 import com.owncloud.android.operations.ExistenceCheckOperation;
  29 import com.owncloud.android.operations.OAuth2GetAccessToken;
  30 import com.owncloud.android.operations.OnRemoteOperationListener;
  31 import com.owncloud.android.operations.RemoteOperation;
  32 import com.owncloud.android.operations.RemoteOperationResult;
  33 import com.owncloud.android.operations.RemoteOperationResult.ResultCode;
  34
  35 import android.accounts.Account;
  36 import android.accounts.AccountAuthenticatorActivity;
  37 import android.accounts.AccountManager;
  38 import android.app.AlertDialog;
  39 import android.app.Dialog;
  40 import android.app.ProgressDialog;
  41 import android.content.ContentResolver;
  42 import android.content.DialogInterface;
  43 import android.content.Intent;
  44 import android.content.SharedPreferences;
  45 import android.graphics.Rect;
  46 import android.graphics.drawable.Drawable;
  47 import android.net.Uri;
  48 import android.os.Bundle;
  49 import android.os.Handler;
  50 import android.preference.PreferenceManager;
  51 import android.text.Editable;
  52 import android.text.InputType;
  53 import android.text.TextWatcher;
  54 import android.view.KeyEvent;
  55 import android.view.MotionEvent;
  56 import android.view.View;
  57 import android.view.View.OnFocusChangeListener;
  58 import android.view.View.OnTouchListener;
  59 import android.view.Window;
  60 import android.view.inputmethod.EditorInfo;
  61 import android.widget.CheckBox;
  62 import android.widget.EditText;
  63 import android.widget.Button;
  64 import android.widget.ImageView;
  65 import android.widget.TextView;
  66 import android.widget.Toast;
  67 import android.widget.TextView.OnEditorActionListener;
  68
  69 import com.owncloud.android.R;
  70
  71 import eu.alefzero.webdav.WebdavClient;
  72
  73 /**
  74  * This Activity is used to add an ownCloud account to the App
  75  *
  76  * @author Bartek Przybylski
  77  * @author David A. Velasco
  78  */
  79 public class AuthenticatorActivity extends AccountAuthenticatorActivity
  80 implements  OnRemoteOperationListener, OnSslValidatorListener, OnFocusChangeListener, OnEditorActionListener {
  81
  82     private static final String TAG = AuthenticatorActivity.class.getSimpleName();
  83
  84     public static final String EXTRA_ACCOUNT = "ACCOUNT";
  85     public static final String EXTRA_USER_NAME = "USER_NAME";
  86     public static final String EXTRA_HOST_NAME = "HOST_NAME";
  87     public static final String EXTRA_ACTION = "ACTION";
  88
  89     private static final String KEY_HOST_URL_TEXT = "HOST_URL_TEXT";
  90     private static final String KEY_OC_VERSION = "OC_VERSION";
  91     private static final String KEY_ACCOUNT = "ACCOUNT";
  92     private static final String KEY_SERVER_VALID = "SERVER_VALID";
  93     private static final String KEY_SERVER_CHECKED = "SERVER_CHECKED";
  94     private static final String KEY_SERVER_CHECK_IN_PROGRESS = "SERVER_CHECK_IN_PROGRESS";
  95     private static final String KEY_SERVER_STATUS_TEXT = "SERVER_STATUS_TEXT";
  96     private static final String KEY_SERVER_STATUS_ICON = "SERVER_STATUS_ICON";
  97     private static final String KEY_IS_SSL_CONN = "IS_SSL_CONN";
  98     private static final String KEY_AUTH_STATUS_TEXT = "AUTH_STATUS_TEXT";
  99     private static final String KEY_AUTH_STATUS_ICON = "AUTH_STATUS_ICON";
 100
 101     private static final String OAUTH_MODE_ON = "on";
 102     private static final String OAUTH_MODE_OFF = "off";
 103     private static final String OAUTH_MODE_OPTIONAL = "optional";
 104
 105     private static final int DIALOG_LOGIN_PROGRESS = 0;
 106     private static final int DIALOG_SSL_VALIDATOR = 1;
 107     private static final int DIALOG_CERT_NOT_SAVED = 2;
 108     private static final int DIALOG_OAUTH2_LOGIN_PROGRESS = 3;
 109
 110     public static final byte ACTION_CREATE = 0;
 111     public static final byte ACTION_UPDATE_TOKEN = 1;
 112
 113
 114     private String mHostBaseUrl;
 115     private OwnCloudVersion mDiscoveredVersion;
 116
 117     private int mServerStatusText, mServerStatusIcon;
 118     private boolean mServerIsChecked, mServerIsValid, mIsSslConn;
 119     private int mAuthStatusText, mAuthStatusIcon;
 120
 121     private final Handler mHandler = new Handler();
 122     private Thread mOperationThread;
 123     private OwnCloudServerCheckOperation mOcServerChkOperation;
 124     private ExistenceCheckOperation mAuthCheckOperation;
 125     private RemoteOperationResult mLastSslUntrustedServerResult;
 126
 127     private Uri mNewCapturedUriFromOAuth2Redirection;
 128
 129     private AccountManager mAccountMgr;
 130     private boolean mJustCreated;
 131     private byte mAction;
 132     private Account mAccount;
 133
 134     private ImageView mViewPasswordButton;
 135     private EditText mHostUrlInput;
 136     private EditText mUsernameInput;
 137     private EditText mPasswordInput;
 138     private CheckBox mOAuth2Check;
 139     private String mOAuthAccessToken;
 140     private View mOkButton;
 141     private TextView mAuthStatusLayout;
 142
 143     private TextView mOAuthAuthEndpointText;
 144     private TextView mOAuthTokenEndpointText;
 145
 146
 147     /**
 148      * {@inheritDoc}
 149      *
 150      * IMPORTANT ENTRY POINT 1: activity is shown to the user
 151      */
 152     @Override
 153     protected void onCreate(Bundle savedInstanceState) {
 154         super.onCreate(savedInstanceState);
 155         getWindow().requestFeature(Window.FEATURE_NO_TITLE);
 156
 157         /// set view and get references to view elements
 158         setContentView(R.layout.account_setup);
 159         mViewPasswordButton = (ImageView) findViewById(R.id.viewPasswordButton);
 160         mHostUrlInput = (EditText) findViewById(R.id.hostUrlInput);
 161         mUsernameInput = (EditText) findViewById(R.id.account_username);
 162         mPasswordInput = (EditText) findViewById(R.id.account_password);
 163         mOAuthAuthEndpointText = (TextView)findViewById(R.id.oAuthEntryPoint_1);
 164         mOAuthTokenEndpointText = (TextView)findViewById(R.id.oAuthEntryPoint_2);
 165         mOAuth2Check = (CheckBox) findViewById(R.id.oauth_onOff_check);
 166         mOkButton = findViewById(R.id.buttonOK);
 167         mAuthStatusLayout = (TextView) findViewById(R.id.auth_status_text);
 168
 169         /// complete label for 'register account' button
 170         Button b = (Button) findViewById(R.id.account_register);
 171         if (b != null) {
 172             b.setText(String.format(getString(R.string.auth_register), getString(R.string.app_name)));
 173         }
 174
 175         /// initialization
 176         mAccountMgr = AccountManager.get(this);
 177         mNewCapturedUriFromOAuth2Redirection = null;
 178         mAction = getIntent().getByteExtra(EXTRA_ACTION, ACTION_CREATE);
 179         mAccount = null;
 180         mHostBaseUrl = "";
 181
 182         if (savedInstanceState == null) {
 183             /// connection state and info
 184             mServerStatusText = mServerStatusIcon = 0;
 185             mServerIsValid = false;
 186             mServerIsChecked = false;
 187             mIsSslConn = false;
 188             mAuthStatusText = mAuthStatusIcon = 0;
 189
 190             /// retrieve extras from intent
 191             String tokenType = getIntent().getExtras().getString(AccountAuthenticator.KEY_AUTH_TOKEN_TYPE);
 192             boolean oAuthRequired = AccountAuthenticator.AUTH_TOKEN_TYPE_ACCESS_TOKEN.equals(tokenType) || OAUTH_MODE_ON.equals(getString(R.string.oauth2_mode));
 193
 194             mAccount = getIntent().getExtras().getParcelable(EXTRA_ACCOUNT);
 195             if (mAccount != null) {
 196                 String ocVersion = mAccountMgr.getUserData(mAccount, AccountAuthenticator.KEY_OC_VERSION);
 197                 if (ocVersion != null) {
 198                     mDiscoveredVersion = new OwnCloudVersion(ocVersion);
 199                 }
 200                 mHostBaseUrl = normalizeUrl(mAccountMgr.getUserData(mAccount, AccountAuthenticator.KEY_OC_BASE_URL));
 201                 mHostUrlInput.setText(mHostBaseUrl);
 202                 String userName = mAccount.name.substring(0, mAccount.name.lastIndexOf('@'));
 203                 mUsernameInput.setText(userName);
 204                 oAuthRequired = (mAccountMgr.getUserData(mAccount, AccountAuthenticator.KEY_SUPPORTS_OAUTH2) != null);
 205             }
 206             mOAuth2Check.setChecked(oAuthRequired);
 207             changeViewByOAuth2Check(oAuthRequired);
 208
 209
 210         } else {
 211             /// connection state and info
 212             mServerIsValid = savedInstanceState.getBoolean(KEY_SERVER_VALID);
 213             mServerIsChecked = savedInstanceState.getBoolean(KEY_SERVER_CHECKED);
 214             mServerStatusText = savedInstanceState.getInt(KEY_SERVER_STATUS_TEXT);
 215             mServerStatusIcon = savedInstanceState.getInt(KEY_SERVER_STATUS_ICON);
 216             mIsSslConn = savedInstanceState.getBoolean(KEY_IS_SSL_CONN);
 217             mAuthStatusText = savedInstanceState.getInt(KEY_AUTH_STATUS_TEXT);
 218             mAuthStatusIcon = savedInstanceState.getInt(KEY_AUTH_STATUS_ICON);
 219
 220             /// server data
 221             String ocVersion = savedInstanceState.getString(KEY_OC_VERSION);
 222             if (ocVersion != null) {
 223                 mDiscoveredVersion = new OwnCloudVersion(ocVersion);
 224             }
 225             mHostBaseUrl = savedInstanceState.getString(KEY_HOST_URL_TEXT);
 226
 227             // account data, if updating
 228             mAccount = savedInstanceState.getParcelable(KEY_ACCOUNT);
 229
 230             // check if server check was interrupted by a configuration change
 231             if (savedInstanceState.getBoolean(KEY_SERVER_CHECK_IN_PROGRESS, false)) {
 232                 checkOcServer();
 233             }
 234
 235         }
 236
 237         showServerStatus();
 238         showAuthStatus();
 239         if (mServerIsChecked && !mServerIsValid) showRefreshButton();
 240         mOkButton.setEnabled(mServerIsValid); // state not automatically recovered in configuration changes
 241
 242         if (!OAUTH_MODE_OPTIONAL.equals(getString(R.string.oauth2_mode))) {
 243             mOAuth2Check.setVisibility(View.GONE);
 244         }
 245
 246         if (mAction == ACTION_UPDATE_TOKEN) {
 247             /// lock things that should not change
 248             mHostUrlInput.setEnabled(false);
 249             mUsernameInput.setEnabled(false);
 250             mOAuth2Check.setVisibility(View.GONE);
 251             if (!mServerIsValid && mOcServerChkOperation == null) {
 252                 checkOcServer();
 253             }
 254         }
 255
 256         mPasswordInput.setText("");     // clean password to avoid social hacking (disadvantage: password in removed if the device is turned aside)
 257         mJustCreated = true;
 258
 259         /// bind view elements to listeners
 260         mHostUrlInput.setOnFocusChangeListener(this);
 261         mHostUrlInput.setOnTouchListener(new RightDrawableOnTouchListener() {
 262             @Override
 263             public boolean onDrawableTouch(final MotionEvent event) {
 264                 AuthenticatorActivity.this.onRefreshClick(mHostUrlInput);
 265                 return true;
 266             }
 267         });
 268         mHostUrlInput.addTextChangedListener(new TextWatcher() {
 269
 270             @Override
 271             public void afterTextChanged(Editable s) {
 272                 if (!mHostBaseUrl.equals(normalizeUrl(mHostUrlInput.getText().toString()))) {
 273                     mOkButton.setEnabled(false);
 274                 }
 275             }
 276
 277             @Override
 278             public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
 279
 280             @Override
 281             public void onTextChanged(CharSequence s, int start, int before, int count) {}
 282
 283         });
 284         mPasswordInput.setOnFocusChangeListener(this);
 285         mPasswordInput.setImeOptions(EditorInfo.IME_ACTION_DONE);
 286         mPasswordInput.setOnEditorActionListener(this);
 287     }
 288
 289     /**
 290      * Saves relevant state before {@link #onPause()}
 291      *
 292      * Do NOT save {@link #mNewCapturedUriFromOAuth2Redirection}; it keeps a temporal flag, intended to defer the
 293      * processing of the redirection caught in {@link #onNewIntent(Intent)} until {@link #onResume()}
 294      *
 295      * See {@link #loadSavedInstanceState(Bundle)}
 296      */
 297     @Override
 298     protected void onSaveInstanceState(Bundle outState) {
 299         super.onSaveInstanceState(outState);
 300
 301         /// connection state and info
 302         outState.putInt(KEY_SERVER_STATUS_TEXT, mServerStatusText);
 303         outState.putInt(KEY_SERVER_STATUS_ICON, mServerStatusIcon);
 304         outState.putBoolean(KEY_SERVER_VALID, mServerIsValid);
 305         outState.putBoolean(KEY_SERVER_CHECKED, mServerIsChecked);
 306         outState.putBoolean(KEY_SERVER_CHECK_IN_PROGRESS, (!mServerIsValid && mOcServerChkOperation != null));
 307         outState.putBoolean(KEY_IS_SSL_CONN, mIsSslConn);
 308         outState.putInt(KEY_AUTH_STATUS_ICON, mAuthStatusIcon);
 309         outState.putInt(KEY_AUTH_STATUS_TEXT, mAuthStatusText);
 310
 311         /// server data
 312         if (mDiscoveredVersion != null) {
 313             outState.putString(KEY_OC_VERSION, mDiscoveredVersion.toString());
 314         }
 315         outState.putString(KEY_HOST_URL_TEXT, mHostBaseUrl);
 316
 317         /// account data, if updating
 318         if (mAccount != null) {
 319             outState.putParcelable(KEY_ACCOUNT, mAccount);
 320         }
 321
 322     }
 323
 324
 325     /**
 326      * The redirection triggered by the OAuth authentication server as response to the GET AUTHORIZATION request
 327      * is caught here.
 328      *
 329      * To make this possible, this activity needs to be qualified with android:launchMode = "singleTask" in the
 330      * AndroidManifest.xml file.
 331      */
 332     @Override
 333     protected void onNewIntent (Intent intent) {
 334         Log_OC.d(TAG, "onNewIntent()");
 335         Uri data = intent.getData();
 336         if (data != null && data.toString().startsWith(getString(R.string.oauth2_redirect_uri))) {
 337             mNewCapturedUriFromOAuth2Redirection = data;
 338         }
 339     }
 340
 341
 342     /**
 343      * The redirection triggered by the OAuth authentication server as response to the GET AUTHORIZATION, and
 344      * deferred in {@link #onNewIntent(Intent)}, is processed here.
 345      */
 346     @Override
 347     protected void onResume() {
 348         super.onResume();
 349         // the state of mOAuth2Check is automatically recovered between configuration changes, but not before onCreate() finishes; so keep the next lines here
 350         changeViewByOAuth2Check(mOAuth2Check.isChecked());
 351         if (mAction == ACTION_UPDATE_TOKEN && mJustCreated) {
 352             if (mOAuth2Check.isChecked())
 353                 Toast.makeText(this, R.string.auth_expired_oauth_token_toast, Toast.LENGTH_LONG).show();
 354             else
 355                 Toast.makeText(this, R.string.auth_expired_basic_auth_toast, Toast.LENGTH_LONG).show();
 356         }
 357
 358         if (mNewCapturedUriFromOAuth2Redirection != null) {
 359             getOAuth2AccessTokenFromCapturedRedirection();
 360         }
 361
 362         mJustCreated = false;
 363     }
 364
 365
 366     /**
 367      * Parses the redirection with the response to the GET AUTHORIZATION request to the
 368      * oAuth server and requests for the access token (GET ACCESS TOKEN)
 369      */
 370     private void getOAuth2AccessTokenFromCapturedRedirection() {
 371         /// Parse data from OAuth redirection
 372         String queryParameters = mNewCapturedUriFromOAuth2Redirection.getQuery();
 373         mNewCapturedUriFromOAuth2Redirection = null;
 374
 375         /// Showing the dialog with instructions for the user.
 376         showDialog(DIALOG_OAUTH2_LOGIN_PROGRESS);
 377
 378         /// GET ACCESS TOKEN to the oAuth server
 379         RemoteOperation operation = new OAuth2GetAccessToken(   getString(R.string.oauth2_client_id),
 380                 getString(R.string.oauth2_redirect_uri),
 381                 getString(R.string.oauth2_grant_type),
 382                 queryParameters);
 383         //WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(getString(R.string.oauth2_url_endpoint_access)), getApplicationContext());
 384         WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(mOAuthTokenEndpointText.getText().toString().trim()), getApplicationContext());
 385         operation.execute(client, this, mHandler);
 386     }
 387
 388
 389
 390     /**
 391      * Handles the change of focus on the text inputs for the server URL and the password
 392      */
 393     public void onFocusChange(View view, boolean hasFocus) {
 394         if (view.getId() == R.id.hostUrlInput) {
 395             if (!hasFocus) {
 396                 onUrlInputFocusLost((TextView) view);
 397             }
 398             else {
 399                 hideRefreshButton();
 400             }
 401
 402         } else if (view.getId() == R.id.account_password) {
 403             onPasswordFocusChanged((TextView) view, hasFocus);
 404         }
 405     }
 406
 407
 408     /**
 409      * Handles changes in focus on the text input for the server URL.
 410      *
 411      * IMPORTANT ENTRY POINT 2: When (!hasFocus), user wrote the server URL and changed to
 412      * other field. The operation to check the existence of the server in the entered URL is
 413      * started.
 414      *
 415      * When hasFocus:    user 'comes back' to write again the server URL.
 416      *
 417      * @param hostInput     TextView with the URL input field receiving the change of focus.
 418      */
 419     private void onUrlInputFocusLost(TextView hostInput) {
 420         if (!mHostBaseUrl.equals(normalizeUrl(mHostUrlInput.getText().toString()))) {
 421             checkOcServer();
 422         } else {
 423             mOkButton.setEnabled(mServerIsValid);
 424         }
 425     }
 426
 427
 428     private void checkOcServer() {
 429         String uri = mHostUrlInput.getText().toString().trim();
 430         mServerIsValid = false;
 431         mServerIsChecked = false;
 432         mOkButton.setEnabled(false);
 433         mDiscoveredVersion = null;
 434         hideRefreshButton();
 435         if (uri.length() != 0) {
 436             mServerStatusText = R.string.auth_testing_connection;
 437             mServerStatusIcon = R.drawable.progress_small;
 438             showServerStatus();
 439             mOcServerChkOperation = new  OwnCloudServerCheckOperation(uri, this);
 440             WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(uri), this);
 441             mOperationThread = mOcServerChkOperation.execute(client, this, mHandler);
 442         } else {
 443             mServerStatusText = 0;
 444             mServerStatusIcon = 0;
 445             showServerStatus();
 446         }
 447     }
 448
 449
 450     /**
 451      * Handles changes in focus on the text input for the password (basic authorization).
 452      *
 453      * When (hasFocus), the button to toggle password visibility is shown.
 454      *
 455      * When (!hasFocus), the button is made invisible and the password is hidden.
 456      *
 457      * @param passwordInput    TextView with the password input field receiving the change of focus.
 458      * @param hasFocus          'True' if focus is received, 'false' if is lost
 459      */
 460     private void onPasswordFocusChanged(TextView passwordInput, boolean hasFocus) {
 461         if (hasFocus) {
 462             mViewPasswordButton.setVisibility(View.VISIBLE);
 463         } else {
 464             int input_type = InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD;
 465             passwordInput.setInputType(input_type);
 466             mViewPasswordButton.setVisibility(View.INVISIBLE);
 467         }
 468     }
 469
 470
 471
 472     /**
 473      * Cancels the authenticator activity
 474      *
 475      * IMPORTANT ENTRY POINT 3: Never underestimate the importance of cancellation
 476      *
 477      * This method is bound in the layout/acceoun_setup.xml resource file.
 478      *
 479      * @param view      Cancel button
 480      */
 481     public void onCancelClick(View view) {
 482         setResult(RESULT_CANCELED);     // TODO review how is this related to AccountAuthenticator (debugging)
 483         finish();
 484     }
 485
 486
 487
 488     /**
 489      * Checks the credentials of the user in the root of the ownCloud server
 490      * before creating a new local account.
 491      *
 492      * For basic authorization, a check of existence of the root folder is
 493      * performed.
 494      *
 495      * For OAuth, starts the flow to get an access token; the credentials test
 496      * is postponed until it is available.
 497      *
 498      * IMPORTANT ENTRY POINT 4
 499      *
 500      * @param view      OK button
 501      */
 502     public void onOkClick(View view) {
 503         // this check should be unnecessary
 504         if (mDiscoveredVersion == null || !mDiscoveredVersion.isVersionValid()  || mHostBaseUrl == null || mHostBaseUrl.length() == 0) {
 505             mServerStatusIcon = R.drawable.common_error;
 506             mServerStatusText = R.string.auth_wtf_reenter_URL;
 507             showServerStatus();
 508             mOkButton.setEnabled(false);
 509             Log_OC.wtf(TAG,  "The user was allowed to click 'connect' to an unchecked server!!");
 510             return;
 511         }
 512
 513         if (mOAuth2Check.isChecked()) {
 514             startOauthorization();
 515
 516         } else {
 517             checkBasicAuthorization();
 518         }
 519     }
 520
 521
 522     /**
 523      * Tests the credentials entered by the user performing a check of existence on
 524      * the root folder of the ownCloud server.
 525      */
 526     private void checkBasicAuthorization() {
 527         /// get the path to the root folder through WebDAV from the version server
 528         String webdav_path = AccountUtils.getWebdavPath(mDiscoveredVersion, false);
 529
 530         /// get basic credentials entered by user
 531         String username = mUsernameInput.getText().toString();
 532         String password = mPasswordInput.getText().toString();
 533
 534         /// be gentle with the user
 535         showDialog(DIALOG_LOGIN_PROGRESS);
 536
 537         /// test credentials accessing the root folder
 538         mAuthCheckOperation = new  ExistenceCheckOperation("", this, false);
 539         WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(mHostBaseUrl + webdav_path), this);
 540         client.setBasicCredentials(username, password);
 541         mOperationThread = mAuthCheckOperation.execute(client, this, mHandler);
 542     }
 543
 544
 545     /**
 546      * Starts the OAuth 'grant type' flow to get an access token, with
 547      * a GET AUTHORIZATION request to the BUILT-IN authorization server.
 548      */
 549     private void startOauthorization() {
 550         // be gentle with the user
 551         mAuthStatusIcon = R.drawable.progress_small;
 552         mAuthStatusText = R.string.oauth_login_connection;
 553         showAuthStatus();
 554
 555         // GET AUTHORIZATION request
 556         //Uri uri = Uri.parse(getString(R.string.oauth2_url_endpoint_auth));
 557         Uri uri = Uri.parse(mOAuthAuthEndpointText.getText().toString().trim());
 558         Uri.Builder uriBuilder = uri.buildUpon();
 559         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_RESPONSE_TYPE, getString(R.string.oauth2_response_type));
 560         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_REDIRECT_URI, getString(R.string.oauth2_redirect_uri));
 561         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_CLIENT_ID, getString(R.string.oauth2_client_id));
 562         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_SCOPE, getString(R.string.oauth2_scope));
 563         //uriBuilder.appendQueryParameter(OAuth2Constants.KEY_STATE, whateverwewant);
 564         uri = uriBuilder.build();
 565         Log_OC.d(TAG, "Starting browser to view " + uri.toString());
 566         Intent i = new Intent(Intent.ACTION_VIEW, uri);
 567         startActivity(i);
 568     }
 569
 570
 571     /**
 572      * Callback method invoked when a RemoteOperation executed by this Activity finishes.
 573      *
 574      * Dispatches the operation flow to the right method.
 575      */
 576     @Override
 577     public void onRemoteOperationFinish(RemoteOperation operation, RemoteOperationResult result) {
 578
 579         if (operation instanceof OwnCloudServerCheckOperation) {
 580             onOcServerCheckFinish((OwnCloudServerCheckOperation) operation, result);
 581
 582         } else if (operation instanceof OAuth2GetAccessToken) {
 583             onGetOAuthAccessTokenFinish((OAuth2GetAccessToken)operation, result);
 584
 585         } else if (operation instanceof ExistenceCheckOperation)  {
 586             onAuthorizationCheckFinish((ExistenceCheckOperation)operation, result);
 587
 588         }
 589     }
 590
 591
 592     /**
 593      * Processes the result of the server check performed when the user finishes the enter of the
 594      * server URL.
 595      *
 596      * @param operation     Server check performed.
 597      * @param result        Result of the check.
 598      */
 599     private void onOcServerCheckFinish(OwnCloudServerCheckOperation operation, RemoteOperationResult result) {
 600         if (operation.equals(mOcServerChkOperation)) {
 601             /// save result state
 602             mServerIsChecked = true;
 603             mServerIsValid = result.isSuccess();
 604             mIsSslConn = (result.getCode() == ResultCode.OK_SSL);
 605             mOcServerChkOperation = null;
 606
 607             /// update status icon and text
 608             if (mServerIsValid) {
 609                 hideRefreshButton();
 610             } else {
 611                 showRefreshButton();
 612             }
 613             updateServerStatusIconAndText(result);
 614             showServerStatus();
 615
 616             /// very special case (TODO: move to a common place for all the remote operations)
 617             if (result.getCode() == ResultCode.SSL_RECOVERABLE_PEER_UNVERIFIED) {
 618                 mLastSslUntrustedServerResult = result;
 619                 showDialog(DIALOG_SSL_VALIDATOR);
 620             }
 621
 622             /// retrieve discovered version and normalize server URL
 623             mDiscoveredVersion = operation.getDiscoveredVersion();
 624             mHostBaseUrl = normalizeUrl(mHostUrlInput.getText().toString());
 625
 626             /// allow or not the user try to access the server
 627             mOkButton.setEnabled(mServerIsValid);
 628
 629         }   // else nothing ; only the last check operation is considered;
 630         // multiple can be triggered if the user amends a URL before a previous check can be triggered
 631     }
 632
 633
 634     private String normalizeUrl(String url) {
 635         if (url != null && url.length() > 0) {
 636             url = url.trim();
 637             if (!url.toLowerCase().startsWith("http://") &&
 638                     !url.toLowerCase().startsWith("https://")) {
 639                 if (mIsSslConn) {
 640                     url = "https://" + url;
 641                 } else {
 642                     url = "http://" + url;
 643                 }
 644
 645             }
 646             if (url.endsWith("/")) {
 647                 url = url.substring(0, url.length() - 1);
 648             }
 649         }
 650         return (url != null ? url : "");
 651     }
 652
 653     /**
 654      * Chooses the right icon and text to show to the user for the received operation result.
 655      *
 656      * @param result    Result of a remote operation performed in this activity
 657      */
 658     private void updateServerStatusIconAndText(RemoteOperationResult result) {
 659         mServerStatusIcon = R.drawable.common_error;    // the most common case in the switch below
 660
 661         switch (result.getCode()) {
 662         case OK_SSL:
 663             mServerStatusIcon = android.R.drawable.ic_secure;
 664             mServerStatusText = R.string.auth_secure_connection;
 665             break;
 666
 667         case OK_NO_SSL:
 668         case OK:
 669             if (mHostUrlInput.getText().toString().trim().toLowerCase().startsWith("http://") ) {
 670                 mServerStatusText = R.string.auth_connection_established;
 671                 mServerStatusIcon = R.drawable.ic_ok;
 672             } else {
 673                 mServerStatusText = R.string.auth_nossl_plain_ok_title;
 674                 mServerStatusIcon = android.R.drawable.ic_partial_secure;
 675             }
 676             break;
 677
 678         case NO_NETWORK_CONNECTION:
 679             mServerStatusIcon = R.drawable.no_network;
 680             mServerStatusText = R.string.auth_no_net_conn_title;
 681             break;
 682
 683         case SSL_RECOVERABLE_PEER_UNVERIFIED:
 684             mServerStatusText = R.string.auth_ssl_unverified_server_title;
 685             break;
 686         case BAD_OC_VERSION:
 687             mServerStatusText = R.string.auth_bad_oc_version_title;
 688             break;
 689         case WRONG_CONNECTION:
 690             mServerStatusText = R.string.auth_wrong_connection_title;
 691             break;
 692         case TIMEOUT:
 693             mServerStatusText = R.string.auth_timeout_title;
 694             break;
 695         case INCORRECT_ADDRESS:
 696             mServerStatusText = R.string.auth_incorrect_address_title;
 697             break;
 698         case SSL_ERROR:
 699             mServerStatusText = R.string.auth_ssl_general_error_title;
 700             break;
 701         case UNAUTHORIZED:
 702             mServerStatusText = R.string.auth_unauthorized;
 703             break;
 704         case HOST_NOT_AVAILABLE:
 705             mServerStatusText = R.string.auth_unknown_host_title;
 706             break;
 707         case INSTANCE_NOT_CONFIGURED:
 708             mServerStatusText = R.string.auth_not_configured_title;
 709             break;
 710         case FILE_NOT_FOUND:
 711             mServerStatusText = R.string.auth_incorrect_path_title;
 712             break;
 713         case OAUTH2_ERROR:
 714             mServerStatusText = R.string.auth_oauth_error;
 715             break;
 716         case OAUTH2_ERROR_ACCESS_DENIED:
 717             mServerStatusText = R.string.auth_oauth_error_access_denied;
 718             break;
 719         case UNHANDLED_HTTP_CODE:
 720         case UNKNOWN_ERROR:
 721             mServerStatusText = R.string.auth_unknown_error_title;
 722             break;
 723         default:
 724             mServerStatusText = 0;
 725             mServerStatusIcon = 0;
 726         }
 727     }
 728
 729
 730     /**
 731      * Chooses the right icon and text to show to the user for the received operation result.
 732      *
 733      * @param result    Result of a remote operation performed in this activity
 734      */
 735     private void updateAuthStatusIconAndText(RemoteOperationResult result) {
 736         mAuthStatusIcon = R.drawable.common_error;    // the most common case in the switch below
 737
 738         switch (result.getCode()) {
 739         case OK_SSL:
 740             mAuthStatusIcon = android.R.drawable.ic_secure;
 741             mAuthStatusText = R.string.auth_secure_connection;
 742             break;
 743
 744         case OK_NO_SSL:
 745         case OK:
 746             if (mHostUrlInput.getText().toString().trim().toLowerCase().startsWith("http://") ) {
 747                 mAuthStatusText = R.string.auth_connection_established;
 748                 mAuthStatusIcon = R.drawable.ic_ok;
 749             } else {
 750                 mAuthStatusText = R.string.auth_nossl_plain_ok_title;
 751                 mAuthStatusIcon = android.R.drawable.ic_partial_secure;
 752             }
 753             break;
 754
 755         case NO_NETWORK_CONNECTION:
 756             mAuthStatusIcon = R.drawable.no_network;
 757             mAuthStatusText = R.string.auth_no_net_conn_title;
 758             break;
 759
 760         case SSL_RECOVERABLE_PEER_UNVERIFIED:
 761             mAuthStatusText = R.string.auth_ssl_unverified_server_title;
 762             break;
 763         case BAD_OC_VERSION:
 764             mAuthStatusText = R.string.auth_bad_oc_version_title;
 765             break;
 766         case WRONG_CONNECTION:
 767             mAuthStatusText = R.string.auth_wrong_connection_title;
 768             break;
 769         case TIMEOUT:
 770             mAuthStatusText = R.string.auth_timeout_title;
 771             break;
 772         case INCORRECT_ADDRESS:
 773             mAuthStatusText = R.string.auth_incorrect_address_title;
 774             break;
 775         case SSL_ERROR:
 776             mAuthStatusText = R.string.auth_ssl_general_error_title;
 777             break;
 778         case UNAUTHORIZED:
 779             mAuthStatusText = R.string.auth_unauthorized;
 780             break;
 781         case HOST_NOT_AVAILABLE:
 782             mAuthStatusText = R.string.auth_unknown_host_title;
 783             break;
 784         case INSTANCE_NOT_CONFIGURED:
 785             mAuthStatusText = R.string.auth_not_configured_title;
 786             break;
 787         case FILE_NOT_FOUND:
 788             mAuthStatusText = R.string.auth_incorrect_path_title;
 789             break;
 790         case OAUTH2_ERROR:
 791             mAuthStatusText = R.string.auth_oauth_error;
 792             break;
 793         case OAUTH2_ERROR_ACCESS_DENIED:
 794             mAuthStatusText = R.string.auth_oauth_error_access_denied;
 795             break;
 796         case UNHANDLED_HTTP_CODE:
 797         case UNKNOWN_ERROR:
 798             mAuthStatusText = R.string.auth_unknown_error_title;
 799             break;
 800         default:
 801             mAuthStatusText = 0;
 802             mAuthStatusIcon = 0;
 803         }
 804     }
 805
 806
 807     /**
 808      * Processes the result of the request for and access token send
 809      * to an OAuth authorization server.
 810      *
 811      * @param operation     Operation performed requesting the access token.
 812      * @param result        Result of the operation.
 813      */
 814     private void onGetOAuthAccessTokenFinish(OAuth2GetAccessToken operation, RemoteOperationResult result) {
 815         try {
 816             dismissDialog(DIALOG_OAUTH2_LOGIN_PROGRESS);
 817         } catch (IllegalArgumentException e) {
 818             // NOTHING TO DO ; can't find out what situation that leads to the exception in this code, but user logs signal that it happens
 819         }
 820
 821         String webdav_path = AccountUtils.getWebdavPath(mDiscoveredVersion, true);
 822         if (result.isSuccess() && webdav_path != null) {
 823             /// be gentle with the user
 824             showDialog(DIALOG_LOGIN_PROGRESS);
 825
 826             /// time to test the retrieved access token on the ownCloud server
 827             mOAuthAccessToken = ((OAuth2GetAccessToken)operation).getResultTokenMap().get(OAuth2Constants.KEY_ACCESS_TOKEN);
 828             Log_OC.d(TAG, "Got ACCESS TOKEN: " + mOAuthAccessToken);
 829             mAuthCheckOperation = new ExistenceCheckOperation("", this, false);
 830             WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(mHostBaseUrl + webdav_path), this);
 831             client.setBearerCredentials(mOAuthAccessToken);
 832             mAuthCheckOperation.execute(client, this, mHandler);
 833
 834         } else {
 835             updateAuthStatusIconAndText(result);
 836             showAuthStatus();
 837             Log_OC.d(TAG, "Access failed: " + result.getLogMessage());
 838         }
 839     }
 840
 841
 842     /**
 843      * Processes the result of the access check performed to try the user credentials.
 844      *
 845      * Creates a new account through the AccountManager.
 846      *
 847      * @param operation     Access check performed.
 848      * @param result        Result of the operation.
 849      */
 850     private void onAuthorizationCheckFinish(ExistenceCheckOperation operation, RemoteOperationResult result) {
 851         try {
 852             dismissDialog(DIALOG_LOGIN_PROGRESS);
 853         } catch (IllegalArgumentException e) {
 854             // NOTHING TO DO ; can't find out what situation that leads to the exception in this code, but user logs signal that it happens
 855         }
 856
 857         if (result.isSuccess()) {
 858             Log_OC.d(TAG, "Successful access - time to save the account");
 859
 860             if (mAction == ACTION_CREATE) {
 861                 createAccount();
 862
 863             } else {
 864                 updateToken();
 865             }
 866
 867             finish();
 868
 869         } else {
 870             updateAuthStatusIconAndText(result);
 871             showAuthStatus();
 872             Log_OC.d(TAG, "Access failed: " + result.getLogMessage());
 873         }
 874     }
 875
 876
 877     /**
 878      * Sets the proper response to get that the Account Authenticator that started this activity saves
 879      * a new authorization token for mAccount.
 880      */
 881     private void updateToken() {
 882         Bundle response = new Bundle();
 883         response.putString(AccountManager.KEY_ACCOUNT_NAME, mAccount.name);
 884         response.putString(AccountManager.KEY_ACCOUNT_TYPE, mAccount.type);
 885         boolean isOAuth = mOAuth2Check.isChecked();
 886         if (isOAuth) {
 887             response.putString(AccountManager.KEY_AUTHTOKEN, mOAuthAccessToken);
 888             // the next line is necessary; by now, notifications are calling directly to the AuthenticatorActivity to update, without AccountManager intervention
 889             mAccountMgr.setAuthToken(mAccount, AccountAuthenticator.AUTH_TOKEN_TYPE_ACCESS_TOKEN, mOAuthAccessToken);
 890         } else {
 891             response.putString(AccountManager.KEY_AUTHTOKEN, mPasswordInput.getText().toString());
 892             mAccountMgr.setPassword(mAccount, mPasswordInput.getText().toString());
 893         }
 894         setAccountAuthenticatorResult(response);
 895     }
 896
 897
 898     /**
 899      * Creates a new account through the Account Authenticator that started this activity.
 900      *
 901      * This makes the account permanent.
 902      *
 903      * TODO Decide how to name the OAuth accounts
 904      */
 905     private void createAccount() {
 906         /// create and save new ownCloud account
 907         boolean isOAuth = mOAuth2Check.isChecked();
 908
 909         Uri uri = Uri.parse(mHostBaseUrl);
 910         String username = mUsernameInput.getText().toString().trim();
 911         if (isOAuth) {
 912             username = "OAuth_user" + (new java.util.Random(System.currentTimeMillis())).nextLong();
 913         }
 914         String accountName = username + "@" + uri.getHost();
 915         if (uri.getPort() >= 0) {
 916             accountName += ":" + uri.getPort();
 917         }
 918         mAccount = new Account(accountName, AccountAuthenticator.ACCOUNT_TYPE);
 919         if (isOAuth) {
 920             mAccountMgr.addAccountExplicitly(mAccount, "", null);  // with our implementation, the password is never input in the app
 921         } else {
 922             mAccountMgr.addAccountExplicitly(mAccount, mPasswordInput.getText().toString(), null);
 923         }
 924
 925         /// add the new account as default in preferences, if there is none already
 926         Account defaultAccount = AccountUtils.getCurrentOwnCloudAccount(this);
 927         if (defaultAccount == null) {
 928             SharedPreferences.Editor editor = PreferenceManager
 929                     .getDefaultSharedPreferences(this).edit();
 930             editor.putString("select_oc_account", accountName);
 931             editor.commit();
 932         }
 933
 934         /// prepare result to return to the Authenticator
 935         //  TODO check again what the Authenticator makes with it; probably has the same effect as addAccountExplicitly, but it's not well done
 936         final Intent intent = new Intent();
 937         intent.putExtra(AccountManager.KEY_ACCOUNT_TYPE,    AccountAuthenticator.ACCOUNT_TYPE);
 938         intent.putExtra(AccountManager.KEY_ACCOUNT_NAME,    mAccount.name);
 939         if (!isOAuth)
 940             intent.putExtra(AccountManager.KEY_AUTHTOKEN,   AccountAuthenticator.ACCOUNT_TYPE); // TODO check this; not sure it's right; maybe
 941         intent.putExtra(AccountManager.KEY_USERDATA,        username);
 942         if (isOAuth) {
 943             mAccountMgr.setAuthToken(mAccount, AccountAuthenticator.AUTH_TOKEN_TYPE_ACCESS_TOKEN, mOAuthAccessToken);
 944         }
 945         /// add user data to the new account; TODO probably can be done in the last parameter addAccountExplicitly, or in KEY_USERDATA
 946         mAccountMgr.setUserData(mAccount, AccountAuthenticator.KEY_OC_VERSION,    mDiscoveredVersion.toString());
 947         mAccountMgr.setUserData(mAccount, AccountAuthenticator.KEY_OC_BASE_URL,   mHostBaseUrl);
 948         if (isOAuth)
 949             mAccountMgr.setUserData(mAccount, AccountAuthenticator.KEY_SUPPORTS_OAUTH2, "TRUE");  // TODO this flag should be unnecessary
 950
 951         setAccountAuthenticatorResult(intent.getExtras());
 952         setResult(RESULT_OK, intent);
 953
 954         /// immediately request for the synchronization of the new account
 955         Bundle bundle = new Bundle();
 956         bundle.putBoolean(ContentResolver.SYNC_EXTRAS_MANUAL, true);
 957         ContentResolver.requestSync(mAccount, AccountAuthenticator.AUTHORITY, bundle);
 958     }
 959
 960
 961     /**
 962      * {@inheritDoc}
 963      *
 964      * Necessary to update the contents of the SSL Dialog
 965      *
 966      * TODO move to some common place for all possible untrusted SSL failures
 967      */
 968     @Override
 969     protected void onPrepareDialog(int id, Dialog dialog, Bundle args) {
 970         switch (id) {
 971         case DIALOG_LOGIN_PROGRESS:
 972         case DIALOG_CERT_NOT_SAVED:
 973         case DIALOG_OAUTH2_LOGIN_PROGRESS:
 974             break;
 975         case DIALOG_SSL_VALIDATOR: {
 976             ((SslValidatorDialog)dialog).updateResult(mLastSslUntrustedServerResult);
 977             break;
 978         }
 979         default:
 980             Log_OC.e(TAG, "Incorrect dialog called with id = " + id);
 981         }
 982     }
 983
 984
 985     /**
 986      * {@inheritDoc}
 987      */
 988     @Override
 989     protected Dialog onCreateDialog(int id) {
 990         Dialog dialog = null;
 991         switch (id) {
 992         case DIALOG_LOGIN_PROGRESS: {
 993             /// simple progress dialog
 994             ProgressDialog working_dialog = new ProgressDialog(this);
 995             working_dialog.setMessage(getResources().getString(R.string.auth_trying_to_login));
 996             working_dialog.setIndeterminate(true);
 997             working_dialog.setCancelable(true);
 998             working_dialog
 999             .setOnCancelListener(new DialogInterface.OnCancelListener() {
1000                 @Override
1001                 public void onCancel(DialogInterface dialog) {
1002                     /// TODO study if this is enough
1003                     Log_OC.i(TAG, "Login canceled");
1004                     if (mOperationThread != null) {
1005                         mOperationThread.interrupt();
1006                         finish();
1007                     }
1008                 }
1009             });
1010             dialog = working_dialog;
1011             break;
1012         }
1013         case DIALOG_OAUTH2_LOGIN_PROGRESS: {
1014             ProgressDialog working_dialog = new ProgressDialog(this);
1015             working_dialog.setMessage(String.format("Getting authorization"));
1016             working_dialog.setIndeterminate(true);
1017             working_dialog.setCancelable(true);
1018             working_dialog
1019             .setOnCancelListener(new DialogInterface.OnCancelListener() {
1020                 @Override
1021                 public void onCancel(DialogInterface dialog) {
1022                     Log_OC.i(TAG, "Login canceled");
1023                     finish();
1024                 }
1025             });
1026             dialog = working_dialog;
1027             break;
1028         }
1029         case DIALOG_SSL_VALIDATOR: {
1030             /// TODO start to use new dialog interface, at least for this (it is a FragmentDialog already)
1031             dialog = SslValidatorDialog.newInstance(this, mLastSslUntrustedServerResult, this);
1032             break;
1033         }
1034         case DIALOG_CERT_NOT_SAVED: {
1035             AlertDialog.Builder builder = new AlertDialog.Builder(this);
1036             builder.setMessage(getResources().getString(R.string.ssl_validator_not_saved));
1037             builder.setCancelable(false);
1038             builder.setPositiveButton(R.string.common_ok, new DialogInterface.OnClickListener() {
1039                 @Override
1040                 public void onClick(DialogInterface dialog, int which) {
1041                     dialog.dismiss();
1042                 };
1043             });
1044             dialog = builder.create();
1045             break;
1046         }
1047         default:
1048             Log_OC.e(TAG, "Incorrect dialog called with id = " + id);
1049         }
1050         return dialog;
1051     }
1052
1053
1054     /**
1055      * Starts and activity to open the 'new account' page in the ownCloud web site
1056      *
1057      * @param view      'Account register' button
1058      */
1059     public void onRegisterClick(View view) {
1060         Intent register = new Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.url_account_register)));
1061         setResult(RESULT_CANCELED);
1062         startActivity(register);
1063     }
1064
1065
1066     /**
1067      * Updates the content and visibility state of the icon and text associated
1068      * to the last check on the ownCloud server.
1069      */
1070     private void showServerStatus() {
1071         TextView tv = (TextView) findViewById(R.id.server_status_text);
1072
1073         if (mServerStatusIcon == 0 && mServerStatusText == 0) {
1074             tv.setVisibility(View.INVISIBLE);
1075
1076         } else {
1077             tv.setText(mServerStatusText);
1078             tv.setCompoundDrawablesWithIntrinsicBounds(mServerStatusIcon, 0, 0, 0);
1079             tv.setVisibility(View.VISIBLE);
1080         }
1081
1082     }
1083
1084
1085     /**
1086      * Updates the content and visibility state of the icon and text associated
1087      * to the interactions with the OAuth authorization server.
1088      */
1089     private void showAuthStatus() {
1090         if (mAuthStatusIcon == 0 && mAuthStatusText == 0) {
1091             mAuthStatusLayout.setVisibility(View.INVISIBLE);
1092
1093         } else {
1094             mAuthStatusLayout.setText(mAuthStatusText);
1095             mAuthStatusLayout.setCompoundDrawablesWithIntrinsicBounds(mAuthStatusIcon, 0, 0, 0);
1096             mAuthStatusLayout.setVisibility(View.VISIBLE);
1097         }
1098     }
1099
1100
1101     private void showRefreshButton() {
1102         mHostUrlInput.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_action_refresh_black, 0);
1103     }
1104
1105     private void hideRefreshButton() {
1106         mHostUrlInput.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
1107     }
1108
1109     /**
1110      * Called when the refresh button in the input field for ownCloud host is clicked.
1111      *
1112      * Performs a new check on the URL in the input field.
1113      *
1114      * @param view      Refresh 'button'
1115      */
1116     public void onRefreshClick(View view) {
1117         checkOcServer();
1118     }
1119
1120
1121     /**
1122      * Called when the eye icon in the password field is clicked.
1123      *
1124      * Toggles the visibility of the password in the field.
1125      *
1126      * @param view      'View password' 'button'
1127      */
1128     public void onViewPasswordClick(View view) {
1129         int selectionStart = mPasswordInput.getSelectionStart();
1130         int selectionEnd = mPasswordInput.getSelectionEnd();
1131         int input_type = mPasswordInput.getInputType();
1132         if ((input_type & InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD) == InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD) {
1133             input_type = InputType.TYPE_CLASS_TEXT
1134                     | InputType.TYPE_TEXT_VARIATION_PASSWORD;
1135         } else {
1136             input_type = InputType.TYPE_CLASS_TEXT
1137                     | InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD;
1138         }
1139         mPasswordInput.setInputType(input_type);
1140         mPasswordInput.setSelection(selectionStart, selectionEnd);
1141     }
1142
1143
1144     /**
1145      * Called when the checkbox for OAuth authorization is clicked.
1146      *
1147      * Hides or shows the input fields for user & password.
1148      *
1149      * @param view      'View password' 'button'
1150      */
1151     public void onCheckClick(View view) {
1152         CheckBox oAuth2Check = (CheckBox)view;
1153         changeViewByOAuth2Check(oAuth2Check.isChecked());
1154
1155     }
1156
1157     /**
1158      * Changes the visibility of input elements depending upon the kind of authorization
1159      * chosen by the user: basic or OAuth
1160      *
1161      * @param checked       'True' when OAuth is selected.
1162      */
1163     public void changeViewByOAuth2Check(Boolean checked) {
1164
1165         if (checked) {
1166             mOAuthAuthEndpointText.setVisibility(View.VISIBLE);
1167             mOAuthTokenEndpointText.setVisibility(View.VISIBLE);
1168             mUsernameInput.setVisibility(View.GONE);
1169             mPasswordInput.setVisibility(View.GONE);
1170             mViewPasswordButton.setVisibility(View.GONE);
1171         } else {
1172             mOAuthAuthEndpointText.setVisibility(View.GONE);
1173             mOAuthTokenEndpointText.setVisibility(View.GONE);
1174             mUsernameInput.setVisibility(View.VISIBLE);
1175             mPasswordInput.setVisibility(View.VISIBLE);
1176             mViewPasswordButton.setVisibility(View.INVISIBLE);
1177         }
1178
1179     }
1180
1181     /**
1182      * Called from SslValidatorDialog when a new server certificate was correctly saved.
1183      */
1184     public void onSavedCertificate() {
1185         mOperationThread = mOcServerChkOperation.retry(this, mHandler);
1186     }
1187
1188     /**
1189      * Called from SslValidatorDialog when a new server certificate could not be saved
1190      * when the user requested it.
1191      */
1192     @Override
1193     public void onFailedSavingCertificate() {
1194         showDialog(DIALOG_CERT_NOT_SAVED);
1195     }
1196
1197
1198     /**
1199      *  Called when the 'action' button in an IME is pressed ('enter' in software keyboard).
1200      *
1201      *  Used to trigger the authorization check when the user presses 'enter' after writing the password.
1202      */
1203     @Override
1204     public boolean onEditorAction(TextView inputField, int actionId, KeyEvent event) {
1205         if (inputField != null && inputField.equals(mPasswordInput) &&
1206                 actionId == EditorInfo.IME_ACTION_DONE) {
1207             if (mOkButton.isEnabled()) {
1208                 mOkButton.performClick();
1209             }
1210         }
1211         return false;   // always return false to grant that the software keyboard is hidden anyway
1212     }
1213
1214
1215     private abstract static class RightDrawableOnTouchListener implements OnTouchListener  {
1216
1217         private int fuzz = 10;
1218
1219         /**
1220          * {@inheritDoc}
1221          */
1222         @Override
1223         public boolean onTouch(View view, MotionEvent event) {
1224             if (event.getAction() == MotionEvent.ACTION_DOWN) {
1225                 Drawable rightDrawable = null;
1226                 if (view instanceof TextView) {
1227                     Drawable[] drawables = ((TextView)view).getCompoundDrawables();
1228                     if (drawables.length > 2) {
1229                         rightDrawable = drawables[2];
1230                     }
1231                 }
1232                 if (rightDrawable != null) {
1233                     final int x = (int) event.getX();
1234                     final int y = (int) event.getY();
1235                     final Rect bounds = rightDrawable.getBounds();
1236                     if (x >= (view.getRight() - bounds.width() - fuzz) && x <= (view.getRight() - view.getPaddingRight() + fuzz)
1237                             && y >= (view.getPaddingTop() - fuzz) && y <= (view.getHeight() - view.getPaddingBottom()) + fuzz) {
1238
1239                         return onDrawableTouch(event);
1240                     }
1241                 }
1242             }
1243             return false;
1244         }
1245
1246         public abstract boolean onDrawableTouch(final MotionEvent event);
1247     }
1248
1249 }