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.TextView;
  65 import android.widget.Toast;
  66 import android.widget.TextView.OnEditorActionListener;
  67
  68 import com.owncloud.android.R;
  69
  70 import eu.alefzero.webdav.WebdavClient;
  71
  72 /**
  73  * This Activity is used to add an ownCloud account to the App
  74  *
  75  * @author Bartek Przybylski
  76  * @author David A. Velasco
  77  */
  78 public class AuthenticatorActivity extends AccountAuthenticatorActivity
  79         implements  OnRemoteOperationListener, OnSslValidatorListener, OnFocusChangeListener, OnEditorActionListener {
  80
  81     private static final String TAG = AuthenticatorActivity.class.getSimpleName();
  82
  83     public static final String EXTRA_ACCOUNT = "ACCOUNT";
  84     public static final String EXTRA_USER_NAME = "USER_NAME";
  85     public static final String EXTRA_HOST_NAME = "HOST_NAME";
  86     public static final String EXTRA_ACTION = "ACTION";
  87
  88     private static final String KEY_HOST_URL_TEXT = "HOST_URL_TEXT";
  89     private static final String KEY_OC_VERSION = "OC_VERSION";
  90     private static final String KEY_ACCOUNT = "ACCOUNT";
  91     private static final String KEY_SERVER_VALID = "SERVER_VALID";
  92     private static final String KEY_SERVER_CHECKED = "SERVER_CHECKED";
  93     private static final String KEY_SERVER_CHECK_IN_PROGRESS = "SERVER_CHECK_IN_PROGRESS";
  94     private static final String KEY_SERVER_STATUS_TEXT = "SERVER_STATUS_TEXT";
  95     private static final String KEY_SERVER_STATUS_ICON = "SERVER_STATUS_ICON";
  96     private static final String KEY_IS_SSL_CONN = "IS_SSL_CONN";
  97     private static final String KEY_PASSWORD_VISIBLE = "PASSWORD_VISIBLE";
  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 EditText mHostUrlInput;
 135     private EditText mUsernameInput;
 136     private EditText mPasswordInput;
 137     private CheckBox mOAuth2Check;
 138     private String mOAuthAccessToken;
 139     private View mOkButton;
 140     private TextView mAuthStatusLayout;
 141
 142     private TextView mOAuthAuthEndpointText;
 143     private TextView mOAuthTokenEndpointText;
 144
 145
 146     /**
 147      * {@inheritDoc}
 148      *
 149      * IMPORTANT ENTRY POINT 1: activity is shown to the user
 150      */
 151     @Override
 152     protected void onCreate(Bundle savedInstanceState) {
 153         super.onCreate(savedInstanceState);
 154         getWindow().requestFeature(Window.FEATURE_NO_TITLE);
 155
 156         /// set view and get references to view elements
 157         setContentView(R.layout.account_setup);
 158         mHostUrlInput = (EditText) findViewById(R.id.hostUrlInput);
 159         mUsernameInput = (EditText) findViewById(R.id.account_username);
 160         mPasswordInput = (EditText) findViewById(R.id.account_password);
 161         mOAuthAuthEndpointText = (TextView)findViewById(R.id.oAuthEntryPoint_1);
 162         mOAuthTokenEndpointText = (TextView)findViewById(R.id.oAuthEntryPoint_2);
 163         mOAuth2Check = (CheckBox) findViewById(R.id.oauth_onOff_check);
 164         mOkButton = findViewById(R.id.buttonOK);
 165         mAuthStatusLayout = (TextView) findViewById(R.id.auth_status_text);
 166
 167         /// complete label for 'register account' button
 168         Button b = (Button) findViewById(R.id.account_register);
 169         if (b != null) {
 170             b.setText(String.format(getString(R.string.auth_register), getString(R.string.app_name)));
 171         }
 172
 173         /// initialization
 174         mAccountMgr = AccountManager.get(this);
 175         mNewCapturedUriFromOAuth2Redirection = null;
 176         mAction = getIntent().getByteExtra(EXTRA_ACTION, ACTION_CREATE);
 177         mAccount = null;
 178         mHostBaseUrl = "";
 179
 180         if (savedInstanceState == null) {
 181             /// connection state and info
 182             mServerStatusText = mServerStatusIcon = 0;
 183             mServerIsValid = false;
 184             mServerIsChecked = false;
 185             mIsSslConn = false;
 186             mAuthStatusText = mAuthStatusIcon = 0;
 187
 188             /// retrieve extras from intent
 189             String tokenType = getIntent().getExtras().getString(AccountAuthenticator.KEY_AUTH_TOKEN_TYPE);
 190             boolean oAuthRequired = AccountAuthenticator.AUTH_TOKEN_TYPE_ACCESS_TOKEN.equals(tokenType) || OAUTH_MODE_ON.equals(getString(R.string.oauth2_mode));
 191
 192             mAccount = getIntent().getExtras().getParcelable(EXTRA_ACCOUNT);
 193             if (mAccount != null) {
 194                 String ocVersion = mAccountMgr.getUserData(mAccount, AccountAuthenticator.KEY_OC_VERSION);
 195                 if (ocVersion != null) {
 196                     mDiscoveredVersion = new OwnCloudVersion(ocVersion);
 197                 }
 198                 mHostBaseUrl = normalizeUrl(mAccountMgr.getUserData(mAccount, AccountAuthenticator.KEY_OC_BASE_URL));
 199                 mHostUrlInput.setText(mHostBaseUrl);
 200                 String userName = mAccount.name.substring(0, mAccount.name.lastIndexOf('@'));
 201                 mUsernameInput.setText(userName);
 202                 oAuthRequired = (mAccountMgr.getUserData(mAccount, AccountAuthenticator.KEY_SUPPORTS_OAUTH2) != null);
 203             }
 204             mOAuth2Check.setChecked(oAuthRequired);
 205             changeViewByOAuth2Check(oAuthRequired);
 206
 207
 208         } else {
 209             /// connection state and info
 210             mServerIsValid = savedInstanceState.getBoolean(KEY_SERVER_VALID);
 211             mServerIsChecked = savedInstanceState.getBoolean(KEY_SERVER_CHECKED);
 212             mServerStatusText = savedInstanceState.getInt(KEY_SERVER_STATUS_TEXT);
 213             mServerStatusIcon = savedInstanceState.getInt(KEY_SERVER_STATUS_ICON);
 214             mIsSslConn = savedInstanceState.getBoolean(KEY_IS_SSL_CONN);
 215             mAuthStatusText = savedInstanceState.getInt(KEY_AUTH_STATUS_TEXT);
 216             mAuthStatusIcon = savedInstanceState.getInt(KEY_AUTH_STATUS_ICON);
 217             if (savedInstanceState.getBoolean(KEY_PASSWORD_VISIBLE, false)) {
 218                 showPassword();
 219             }
 220
 221             /// server data
 222             String ocVersion = savedInstanceState.getString(KEY_OC_VERSION);
 223             if (ocVersion != null) {
 224                 mDiscoveredVersion = new OwnCloudVersion(ocVersion);
 225             }
 226             mHostBaseUrl = savedInstanceState.getString(KEY_HOST_URL_TEXT);
 227
 228             // account data, if updating
 229             mAccount = savedInstanceState.getParcelable(KEY_ACCOUNT);
 230
 231             // check if server check was interrupted by a configuration change
 232             if (savedInstanceState.getBoolean(KEY_SERVER_CHECK_IN_PROGRESS, false)) {
 233                 checkOcServer();
 234             }
 235
 236         }
 237
 238         showServerStatus();
 239         showAuthStatus();
 240         if (mServerIsChecked && !mServerIsValid) showRefreshButton();
 241         mOkButton.setEnabled(mServerIsValid); // state not automatically recovered in configuration changes
 242
 243         if (!OAUTH_MODE_OPTIONAL.equals(getString(R.string.oauth2_mode))) {
 244             mOAuth2Check.setVisibility(View.GONE);
 245         }
 246
 247         if (mAction == ACTION_UPDATE_TOKEN) {
 248             /// lock things that should not change
 249             mHostUrlInput.setEnabled(false);
 250             mUsernameInput.setEnabled(false);
 251             mOAuth2Check.setVisibility(View.GONE);
 252             if (!mServerIsValid && mOcServerChkOperation == null) {
 253                 checkOcServer();
 254             }
 255         }
 256
 257         mPasswordInput.setText("");     // clean password to avoid social hacking (disadvantage: password in removed if the device is turned aside)
 258         mJustCreated = true;
 259
 260         /// bind view elements to listeners
 261         mHostUrlInput.setOnFocusChangeListener(this);
 262         mHostUrlInput.setOnTouchListener(new RightDrawableOnTouchListener() {
 263             @Override
 264             public boolean onDrawableTouch(final MotionEvent event) {
 265                 if (event.getAction() == MotionEvent.ACTION_UP) {
 266                     AuthenticatorActivity.this.onRefreshClick();
 267                 }
 268                 return true;
 269             }
 270         });
 271         mHostUrlInput.addTextChangedListener(new TextWatcher() {
 272
 273             @Override
 274             public void afterTextChanged(Editable s) {
 275                 if (!mHostBaseUrl.equals(normalizeUrl(mHostUrlInput.getText().toString()))) {
 276                     mOkButton.setEnabled(false);
 277                 }
 278             }
 279
 280             @Override
 281             public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
 282
 283             @Override
 284             public void onTextChanged(CharSequence s, int start, int before, int count) {}
 285
 286         });
 287         mPasswordInput.setOnFocusChangeListener(this);
 288         mPasswordInput.setImeOptions(EditorInfo.IME_ACTION_DONE);
 289         mPasswordInput.setOnEditorActionListener(this);
 290         mPasswordInput.setOnTouchListener(new RightDrawableOnTouchListener() {
 291             @Override
 292             public boolean onDrawableTouch(final MotionEvent event) {
 293                 if (event.getAction() == MotionEvent.ACTION_UP) {
 294                     AuthenticatorActivity.this.onViewPasswordClick();
 295                 }
 296                 return true;
 297             }
 298         });
 299     }
 300
 301     /**
 302      * Saves relevant state before {@link #onPause()}
 303      *
 304      * Do NOT save {@link #mNewCapturedUriFromOAuth2Redirection}; it keeps a temporal flag, intended to defer the
 305      * processing of the redirection caught in {@link #onNewIntent(Intent)} until {@link #onResume()}
 306      *
 307      * See {@link #loadSavedInstanceState(Bundle)}
 308      */
 309     @Override
 310     protected void onSaveInstanceState(Bundle outState) {
 311         super.onSaveInstanceState(outState);
 312
 313         /// connection state and info
 314         outState.putInt(KEY_SERVER_STATUS_TEXT, mServerStatusText);
 315         outState.putInt(KEY_SERVER_STATUS_ICON, mServerStatusIcon);
 316         outState.putBoolean(KEY_SERVER_VALID, mServerIsValid);
 317         outState.putBoolean(KEY_SERVER_CHECKED, mServerIsChecked);
 318         outState.putBoolean(KEY_SERVER_CHECK_IN_PROGRESS, (!mServerIsValid && mOcServerChkOperation != null));
 319         outState.putBoolean(KEY_IS_SSL_CONN, mIsSslConn);
 320         outState.putBoolean(KEY_PASSWORD_VISIBLE, isPasswordVisible());
 321         outState.putInt(KEY_AUTH_STATUS_ICON, mAuthStatusIcon);
 322         outState.putInt(KEY_AUTH_STATUS_TEXT, mAuthStatusText);
 323
 324         /// server data
 325         if (mDiscoveredVersion != null) {
 326             outState.putString(KEY_OC_VERSION, mDiscoveredVersion.toString());
 327         }
 328         outState.putString(KEY_HOST_URL_TEXT, mHostBaseUrl);
 329
 330         /// account data, if updating
 331         if (mAccount != null) {
 332             outState.putParcelable(KEY_ACCOUNT, mAccount);
 333         }
 334
 335     }
 336
 337
 338     /**
 339      * The redirection triggered by the OAuth authentication server as response to the GET AUTHORIZATION request
 340      * is caught here.
 341      *
 342      * To make this possible, this activity needs to be qualified with android:launchMode = "singleTask" in the
 343      * AndroidManifest.xml file.
 344      */
 345     @Override
 346     protected void onNewIntent (Intent intent) {
 347         Log_OC.d(TAG, "onNewIntent()");
 348         Uri data = intent.getData();
 349         if (data != null && data.toString().startsWith(getString(R.string.oauth2_redirect_uri))) {
 350             mNewCapturedUriFromOAuth2Redirection = data;
 351         }
 352     }
 353
 354
 355     /**
 356      * The redirection triggered by the OAuth authentication server as response to the GET AUTHORIZATION, and
 357      * deferred in {@link #onNewIntent(Intent)}, is processed here.
 358      */
 359     @Override
 360     protected void onResume() {
 361         super.onResume();
 362         // the state of mOAuth2Check is automatically recovered between configuration changes, but not before onCreate() finishes; so keep the next lines here
 363         changeViewByOAuth2Check(mOAuth2Check.isChecked());
 364         if (mAction == ACTION_UPDATE_TOKEN && mJustCreated) {
 365             if (mOAuth2Check.isChecked())
 366                 Toast.makeText(this, R.string.auth_expired_oauth_token_toast, Toast.LENGTH_LONG).show();
 367             else
 368                 Toast.makeText(this, R.string.auth_expired_basic_auth_toast, Toast.LENGTH_LONG).show();
 369         }
 370
 371         if (mNewCapturedUriFromOAuth2Redirection != null) {
 372             getOAuth2AccessTokenFromCapturedRedirection();
 373         }
 374
 375         mJustCreated = false;
 376     }
 377
 378
 379     /**
 380      * Parses the redirection with the response to the GET AUTHORIZATION request to the
 381      * oAuth server and requests for the access token (GET ACCESS TOKEN)
 382      */
 383     private void getOAuth2AccessTokenFromCapturedRedirection() {
 384         /// Parse data from OAuth redirection
 385         String queryParameters = mNewCapturedUriFromOAuth2Redirection.getQuery();
 386         mNewCapturedUriFromOAuth2Redirection = null;
 387
 388         /// Showing the dialog with instructions for the user.
 389         showDialog(DIALOG_OAUTH2_LOGIN_PROGRESS);
 390
 391         /// GET ACCESS TOKEN to the oAuth server
 392         RemoteOperation operation = new OAuth2GetAccessToken(   getString(R.string.oauth2_client_id),
 393                                                                 getString(R.string.oauth2_redirect_uri),
 394                                                                 getString(R.string.oauth2_grant_type),
 395                                                                 queryParameters);
 396         //WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(getString(R.string.oauth2_url_endpoint_access)), getApplicationContext());
 397         WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(mOAuthTokenEndpointText.getText().toString().trim()), getApplicationContext());
 398         operation.execute(client, this, mHandler);
 399     }
 400
 401
 402
 403     /**
 404      * Handles the change of focus on the text inputs for the server URL and the password
 405      */
 406     public void onFocusChange(View view, boolean hasFocus) {
 407         if (view.getId() == R.id.hostUrlInput && !hasFocus) {
 408             onUrlInputFocusLost((TextView) view);
 409
 410         } else if (view.getId() == R.id.account_password) {
 411             onPasswordFocusChanged((TextView) view, hasFocus);
 412         }
 413     }
 414
 415
 416     /**
 417      * Handles changes in focus on the text input for the server URL.
 418      *
 419      * IMPORTANT ENTRY POINT 2: When (!hasFocus), user wrote the server URL and changed to
 420      * other field. The operation to check the existence of the server in the entered URL is
 421      * started.
 422      *
 423      * When hasFocus:    user 'comes back' to write again the server URL.
 424      *
 425      * @param hostInput     TextView with the URL input field receiving the change of focus.
 426      */
 427     private void onUrlInputFocusLost(TextView hostInput) {
 428         if (!mHostBaseUrl.equals(normalizeUrl(mHostUrlInput.getText().toString()))) {
 429             checkOcServer();
 430         } else {
 431             mOkButton.setEnabled(mServerIsValid);
 432         }
 433     }
 434
 435
 436     private void checkOcServer() {
 437         String uri = mHostUrlInput.getText().toString().trim();
 438         mServerIsValid = false;
 439         mServerIsChecked = false;
 440         mOkButton.setEnabled(false);
 441         mDiscoveredVersion = null;
 442         hideRefreshButton();
 443         if (uri.length() != 0) {
 444             mServerStatusText = R.string.auth_testing_connection;
 445             mServerStatusIcon = R.drawable.progress_small;
 446             showServerStatus();
 447             mOcServerChkOperation = new  OwnCloudServerCheckOperation(uri, this);
 448             WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(uri), this);
 449             mOperationThread = mOcServerChkOperation.execute(client, this, mHandler);
 450         } else {
 451             mServerStatusText = 0;
 452             mServerStatusIcon = 0;
 453             showServerStatus();
 454         }
 455     }
 456
 457
 458     /**
 459      * Handles changes in focus on the text input for the password (basic authorization).
 460      *
 461      * When (hasFocus), the button to toggle password visibility is shown.
 462      *
 463      * When (!hasFocus), the button is made invisible and the password is hidden.
 464      *
 465      * @param passwordInput    TextView with the password input field receiving the change of focus.
 466      * @param hasFocus          'True' if focus is received, 'false' if is lost
 467      */
 468     private void onPasswordFocusChanged(TextView passwordInput, boolean hasFocus) {
 469         if (hasFocus) {
 470             showViewPasswordButton();
 471         } else {
 472             hidePassword();
 473             hidePasswordButton();
 474         }
 475     }
 476
 477
 478     private void showViewPasswordButton() {
 479         int drawable = android.R.drawable.ic_menu_view;
 480         if (isPasswordVisible()) {
 481             drawable = android.R.drawable.ic_secure;
 482         }
 483         mPasswordInput.setCompoundDrawablesWithIntrinsicBounds(0, 0, drawable, 0);
 484     }
 485
 486     private boolean isPasswordVisible() {
 487         return ((mPasswordInput.getInputType() & InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD) == InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
 488     }
 489
 490     private void hidePasswordButton() {
 491         mPasswordInput.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
 492     }
 493
 494     private void showPassword() {
 495         mPasswordInput.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
 496         showViewPasswordButton();
 497     }
 498
 499     private void hidePassword() {
 500         mPasswordInput.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
 501         showViewPasswordButton();
 502     }
 503
 504
 505     /**
 506      * Cancels the authenticator activity
 507      *
 508      * IMPORTANT ENTRY POINT 3: Never underestimate the importance of cancellation
 509      *
 510      * This method is bound in the layout/acceoun_setup.xml resource file.
 511      *
 512      * @param view      Cancel button
 513      */
 514     public void onCancelClick(View view) {
 515         setResult(RESULT_CANCELED);     // TODO review how is this related to AccountAuthenticator (debugging)
 516         finish();
 517     }
 518
 519
 520
 521     /**
 522      * Checks the credentials of the user in the root of the ownCloud server
 523      * before creating a new local account.
 524      *
 525      * For basic authorization, a check of existence of the root folder is
 526      * performed.
 527      *
 528      * For OAuth, starts the flow to get an access token; the credentials test
 529      * is postponed until it is available.
 530      *
 531      * IMPORTANT ENTRY POINT 4
 532      *
 533      * @param view      OK button
 534      */
 535     public void onOkClick(View view) {
 536         // this check should be unnecessary
 537         if (mDiscoveredVersion == null || !mDiscoveredVersion.isVersionValid()  || mHostBaseUrl == null || mHostBaseUrl.length() == 0) {
 538             mServerStatusIcon = R.drawable.common_error;
 539             mServerStatusText = R.string.auth_wtf_reenter_URL;
 540             showServerStatus();
 541             mOkButton.setEnabled(false);
 542             Log_OC.wtf(TAG,  "The user was allowed to click 'connect' to an unchecked server!!");
 543             return;
 544         }
 545
 546         if (mOAuth2Check.isChecked()) {
 547             startOauthorization();
 548
 549         } else {
 550             checkBasicAuthorization();
 551         }
 552     }
 553
 554
 555     /**
 556      * Tests the credentials entered by the user performing a check of existence on
 557      * the root folder of the ownCloud server.
 558      */
 559     private void checkBasicAuthorization() {
 560         /// get the path to the root folder through WebDAV from the version server
 561         String webdav_path = AccountUtils.getWebdavPath(mDiscoveredVersion, false);
 562
 563         /// get basic credentials entered by user
 564         String username = mUsernameInput.getText().toString();
 565         String password = mPasswordInput.getText().toString();
 566
 567         /// be gentle with the user
 568         showDialog(DIALOG_LOGIN_PROGRESS);
 569
 570         /// test credentials accessing the root folder
 571         mAuthCheckOperation = new  ExistenceCheckOperation("", this, false);
 572         WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(mHostBaseUrl + webdav_path), this);
 573         client.setBasicCredentials(username, password);
 574         mOperationThread = mAuthCheckOperation.execute(client, this, mHandler);
 575     }
 576
 577
 578     /**
 579      * Starts the OAuth 'grant type' flow to get an access token, with
 580      * a GET AUTHORIZATION request to the BUILT-IN authorization server.
 581      */
 582     private void startOauthorization() {
 583         // be gentle with the user
 584         mAuthStatusIcon = R.drawable.progress_small;
 585         mAuthStatusText = R.string.oauth_login_connection;
 586         showAuthStatus();
 587
 588         // GET AUTHORIZATION request
 589         //Uri uri = Uri.parse(getString(R.string.oauth2_url_endpoint_auth));
 590         Uri uri = Uri.parse(mOAuthAuthEndpointText.getText().toString().trim());
 591         Uri.Builder uriBuilder = uri.buildUpon();
 592         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_RESPONSE_TYPE, getString(R.string.oauth2_response_type));
 593         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_REDIRECT_URI, getString(R.string.oauth2_redirect_uri));
 594         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_CLIENT_ID, getString(R.string.oauth2_client_id));
 595         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_SCOPE, getString(R.string.oauth2_scope));
 596         //uriBuilder.appendQueryParameter(OAuth2Constants.KEY_STATE, whateverwewant);
 597         uri = uriBuilder.build();
 598         Log_OC.d(TAG, "Starting browser to view " + uri.toString());
 599         Intent i = new Intent(Intent.ACTION_VIEW, uri);
 600         startActivity(i);
 601     }
 602
 603
 604     /**
 605      * Callback method invoked when a RemoteOperation executed by this Activity finishes.
 606      *
 607      * Dispatches the operation flow to the right method.
 608      */
 609     @Override
 610     public void onRemoteOperationFinish(RemoteOperation operation, RemoteOperationResult result) {
 611
 612         if (operation instanceof OwnCloudServerCheckOperation) {
 613             onOcServerCheckFinish((OwnCloudServerCheckOperation) operation, result);
 614
 615         } else if (operation instanceof OAuth2GetAccessToken) {
 616             onGetOAuthAccessTokenFinish((OAuth2GetAccessToken)operation, result);
 617
 618         } else if (operation instanceof ExistenceCheckOperation)  {
 619             onAuthorizationCheckFinish((ExistenceCheckOperation)operation, result);
 620
 621         }
 622     }
 623
 624
 625     /**
 626      * Processes the result of the server check performed when the user finishes the enter of the
 627      * server URL.
 628      *
 629      * @param operation     Server check performed.
 630      * @param result        Result of the check.
 631      */
 632     private void onOcServerCheckFinish(OwnCloudServerCheckOperation operation, RemoteOperationResult result) {
 633         if (operation.equals(mOcServerChkOperation)) {
 634             /// save result state
 635             mServerIsChecked = true;
 636             mServerIsValid = result.isSuccess();
 637             mIsSslConn = (result.getCode() == ResultCode.OK_SSL);
 638             mOcServerChkOperation = null;
 639
 640             /// update status icon and text
 641             if (mServerIsValid) {
 642                 hideRefreshButton();
 643             } else {
 644                 showRefreshButton();
 645             }
 646             updateServerStatusIconAndText(result);
 647             showServerStatus();
 648
 649             /// very special case (TODO: move to a common place for all the remote operations)
 650             if (result.getCode() == ResultCode.SSL_RECOVERABLE_PEER_UNVERIFIED) {
 651                 mLastSslUntrustedServerResult = result;
 652                 showDialog(DIALOG_SSL_VALIDATOR);
 653             }
 654
 655             /// retrieve discovered version and normalize server URL
 656             mDiscoveredVersion = operation.getDiscoveredVersion();
 657             mHostBaseUrl = normalizeUrl(mHostUrlInput.getText().toString());
 658
 659             /// allow or not the user try to access the server
 660             mOkButton.setEnabled(mServerIsValid);
 661
 662         }   // else nothing ; only the last check operation is considered;
 663             // multiple can be triggered if the user amends a URL before a previous check can be triggered
 664     }
 665
 666
 667     private String normalizeUrl(String url) {
 668         if (url != null && url.length() > 0) {
 669             url = url.trim();
 670             if (!url.toLowerCase().startsWith("http://") &&
 671                     !url.toLowerCase().startsWith("https://")) {
 672                 if (mIsSslConn) {
 673                     url = "https://" + url;
 674                 } else {
 675                     url = "http://" + url;
 676                 }
 677
 678             }
 679             if (url.endsWith("/")) {
 680                 url = url.substring(0, url.length() - 1);
 681             }
 682         }
 683         return (url != null ? url : "");
 684     }
 685
 686     /**
 687      * Chooses the right icon and text to show to the user for the received operation result.
 688      *
 689      * @param result    Result of a remote operation performed in this activity
 690      */
 691     private void updateServerStatusIconAndText(RemoteOperationResult result) {
 692         mServerStatusIcon = R.drawable.common_error;    // the most common case in the switch below
 693
 694         switch (result.getCode()) {
 695         case OK_SSL:
 696             mServerStatusIcon = android.R.drawable.ic_secure;
 697             mServerStatusText = R.string.auth_secure_connection;
 698             break;
 699
 700         case OK_NO_SSL:
 701         case OK:
 702             if (mHostUrlInput.getText().toString().trim().toLowerCase().startsWith("http://") ) {
 703                 mServerStatusText = R.string.auth_connection_established;
 704                 mServerStatusIcon = R.drawable.ic_ok;
 705             } else {
 706                 mServerStatusText = R.string.auth_nossl_plain_ok_title;
 707                 mServerStatusIcon = android.R.drawable.ic_partial_secure;
 708             }
 709             break;
 710
 711         case NO_NETWORK_CONNECTION:
 712             mServerStatusIcon = R.drawable.no_network;
 713             mServerStatusText = R.string.auth_no_net_conn_title;
 714             break;
 715
 716         case SSL_RECOVERABLE_PEER_UNVERIFIED:
 717             mServerStatusText = R.string.auth_ssl_unverified_server_title;
 718             break;
 719         case BAD_OC_VERSION:
 720             mServerStatusText = R.string.auth_bad_oc_version_title;
 721             break;
 722         case WRONG_CONNECTION:
 723             mServerStatusText = R.string.auth_wrong_connection_title;
 724             break;
 725         case TIMEOUT:
 726             mServerStatusText = R.string.auth_timeout_title;
 727             break;
 728         case INCORRECT_ADDRESS:
 729             mServerStatusText = R.string.auth_incorrect_address_title;
 730             break;
 731         case SSL_ERROR:
 732             mServerStatusText = R.string.auth_ssl_general_error_title;
 733             break;
 734         case UNAUTHORIZED:
 735             mServerStatusText = R.string.auth_unauthorized;
 736             break;
 737         case HOST_NOT_AVAILABLE:
 738             mServerStatusText = R.string.auth_unknown_host_title;
 739             break;
 740         case INSTANCE_NOT_CONFIGURED:
 741             mServerStatusText = R.string.auth_not_configured_title;
 742             break;
 743         case FILE_NOT_FOUND:
 744             mServerStatusText = R.string.auth_incorrect_path_title;
 745             break;
 746         case OAUTH2_ERROR:
 747             mServerStatusText = R.string.auth_oauth_error;
 748             break;
 749         case OAUTH2_ERROR_ACCESS_DENIED:
 750             mServerStatusText = R.string.auth_oauth_error_access_denied;
 751             break;
 752         case UNHANDLED_HTTP_CODE:
 753         case UNKNOWN_ERROR:
 754             mServerStatusText = R.string.auth_unknown_error_title;
 755             break;
 756         default:
 757             mServerStatusText = 0;
 758             mServerStatusIcon = 0;
 759         }
 760     }
 761
 762
 763     /**
 764      * Chooses the right icon and text to show to the user for the received operation result.
 765      *
 766      * @param result    Result of a remote operation performed in this activity
 767      */
 768     private void updateAuthStatusIconAndText(RemoteOperationResult result) {
 769         mAuthStatusIcon = R.drawable.common_error;    // the most common case in the switch below
 770
 771         switch (result.getCode()) {
 772         case OK_SSL:
 773             mAuthStatusIcon = android.R.drawable.ic_secure;
 774             mAuthStatusText = R.string.auth_secure_connection;
 775             break;
 776
 777         case OK_NO_SSL:
 778         case OK:
 779             if (mHostUrlInput.getText().toString().trim().toLowerCase().startsWith("http://") ) {
 780                 mAuthStatusText = R.string.auth_connection_established;
 781                 mAuthStatusIcon = R.drawable.ic_ok;
 782             } else {
 783                 mAuthStatusText = R.string.auth_nossl_plain_ok_title;
 784                 mAuthStatusIcon = android.R.drawable.ic_partial_secure;
 785             }
 786             break;
 787
 788         case NO_NETWORK_CONNECTION:
 789             mAuthStatusIcon = R.drawable.no_network;
 790             mAuthStatusText = R.string.auth_no_net_conn_title;
 791             break;
 792
 793         case SSL_RECOVERABLE_PEER_UNVERIFIED:
 794             mAuthStatusText = R.string.auth_ssl_unverified_server_title;
 795             break;
 796         case BAD_OC_VERSION:
 797             mAuthStatusText = R.string.auth_bad_oc_version_title;
 798             break;
 799         case WRONG_CONNECTION:
 800             mAuthStatusText = R.string.auth_wrong_connection_title;
 801             break;
 802         case TIMEOUT:
 803             mAuthStatusText = R.string.auth_timeout_title;
 804             break;
 805         case INCORRECT_ADDRESS:
 806             mAuthStatusText = R.string.auth_incorrect_address_title;
 807             break;
 808         case SSL_ERROR:
 809             mAuthStatusText = R.string.auth_ssl_general_error_title;
 810             break;
 811         case UNAUTHORIZED:
 812             mAuthStatusText = R.string.auth_unauthorized;
 813             break;
 814         case HOST_NOT_AVAILABLE:
 815             mAuthStatusText = R.string.auth_unknown_host_title;
 816             break;
 817         case INSTANCE_NOT_CONFIGURED:
 818             mAuthStatusText = R.string.auth_not_configured_title;
 819             break;
 820         case FILE_NOT_FOUND:
 821             mAuthStatusText = R.string.auth_incorrect_path_title;
 822             break;
 823         case OAUTH2_ERROR:
 824             mAuthStatusText = R.string.auth_oauth_error;
 825             break;
 826         case OAUTH2_ERROR_ACCESS_DENIED:
 827             mAuthStatusText = R.string.auth_oauth_error_access_denied;
 828             break;
 829         case UNHANDLED_HTTP_CODE:
 830         case UNKNOWN_ERROR:
 831             mAuthStatusText = R.string.auth_unknown_error_title;
 832             break;
 833         default:
 834             mAuthStatusText = 0;
 835             mAuthStatusIcon = 0;
 836         }
 837     }
 838
 839
 840     /**
 841      * Processes the result of the request for and access token send
 842      * to an OAuth authorization server.
 843      *
 844      * @param operation     Operation performed requesting the access token.
 845      * @param result        Result of the operation.
 846      */
 847     private void onGetOAuthAccessTokenFinish(OAuth2GetAccessToken operation, RemoteOperationResult result) {
 848         try {
 849             dismissDialog(DIALOG_OAUTH2_LOGIN_PROGRESS);
 850         } catch (IllegalArgumentException e) {
 851             // NOTHING TO DO ; can't find out what situation that leads to the exception in this code, but user logs signal that it happens
 852         }
 853
 854         String webdav_path = AccountUtils.getWebdavPath(mDiscoveredVersion, true);
 855         if (result.isSuccess() && webdav_path != null) {
 856             /// be gentle with the user
 857             showDialog(DIALOG_LOGIN_PROGRESS);
 858
 859             /// time to test the retrieved access token on the ownCloud server
 860             mOAuthAccessToken = ((OAuth2GetAccessToken)operation).getResultTokenMap().get(OAuth2Constants.KEY_ACCESS_TOKEN);
 861             Log_OC.d(TAG, "Got ACCESS TOKEN: " + mOAuthAccessToken);
 862             mAuthCheckOperation = new ExistenceCheckOperation("", this, false);
 863             WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(mHostBaseUrl + webdav_path), this);
 864             client.setBearerCredentials(mOAuthAccessToken);
 865             mAuthCheckOperation.execute(client, this, mHandler);
 866
 867         } else {
 868             updateAuthStatusIconAndText(result);
 869             showAuthStatus();
 870             Log_OC.d(TAG, "Access failed: " + result.getLogMessage());
 871         }
 872     }
 873
 874
 875     /**
 876      * Processes the result of the access check performed to try the user credentials.
 877      *
 878      * Creates a new account through the AccountManager.
 879      *
 880      * @param operation     Access check performed.
 881      * @param result        Result of the operation.
 882      */
 883     private void onAuthorizationCheckFinish(ExistenceCheckOperation operation, RemoteOperationResult result) {
 884         try {
 885             dismissDialog(DIALOG_LOGIN_PROGRESS);
 886         } catch (IllegalArgumentException e) {
 887             // NOTHING TO DO ; can't find out what situation that leads to the exception in this code, but user logs signal that it happens
 888         }
 889
 890         if (result.isSuccess()) {
 891             Log_OC.d(TAG, "Successful access - time to save the account");
 892
 893             if (mAction == ACTION_CREATE) {
 894                 createAccount();
 895
 896             } else {
 897                 updateToken();
 898             }
 899
 900             finish();
 901
 902         } else {
 903             updateAuthStatusIconAndText(result);
 904             showAuthStatus();
 905             Log_OC.d(TAG, "Access failed: " + result.getLogMessage());
 906         }
 907     }
 908
 909
 910     /**
 911      * Sets the proper response to get that the Account Authenticator that started this activity saves
 912      * a new authorization token for mAccount.
 913      */
 914     private void updateToken() {
 915         Bundle response = new Bundle();
 916         response.putString(AccountManager.KEY_ACCOUNT_NAME, mAccount.name);
 917         response.putString(AccountManager.KEY_ACCOUNT_TYPE, mAccount.type);
 918         boolean isOAuth = mOAuth2Check.isChecked();
 919         if (isOAuth) {
 920             response.putString(AccountManager.KEY_AUTHTOKEN, mOAuthAccessToken);
 921             // the next line is necessary; by now, notifications are calling directly to the AuthenticatorActivity to update, without AccountManager intervention
 922             mAccountMgr.setAuthToken(mAccount, AccountAuthenticator.AUTH_TOKEN_TYPE_ACCESS_TOKEN, mOAuthAccessToken);
 923         } else {
 924             response.putString(AccountManager.KEY_AUTHTOKEN, mPasswordInput.getText().toString());
 925             mAccountMgr.setPassword(mAccount, mPasswordInput.getText().toString());
 926         }
 927         setAccountAuthenticatorResult(response);
 928     }
 929
 930
 931     /**
 932      * Creates a new account through the Account Authenticator that started this activity.
 933      *
 934      * This makes the account permanent.
 935      *
 936      * TODO Decide how to name the OAuth accounts
 937      */
 938     private void createAccount() {
 939         /// create and save new ownCloud account
 940         boolean isOAuth = mOAuth2Check.isChecked();
 941
 942         Uri uri = Uri.parse(mHostBaseUrl);
 943         String username = mUsernameInput.getText().toString().trim();
 944         if (isOAuth) {
 945             username = "OAuth_user" + (new java.util.Random(System.currentTimeMillis())).nextLong();
 946         }
 947         String accountName = username + "@" + uri.getHost();
 948         if (uri.getPort() >= 0) {
 949             accountName += ":" + uri.getPort();
 950         }
 951         mAccount = new Account(accountName, AccountAuthenticator.ACCOUNT_TYPE);
 952         if (isOAuth) {
 953             mAccountMgr.addAccountExplicitly(mAccount, "", null);  // with our implementation, the password is never input in the app
 954         } else {
 955             mAccountMgr.addAccountExplicitly(mAccount, mPasswordInput.getText().toString(), null);
 956         }
 957
 958         /// add the new account as default in preferences, if there is none already
 959         Account defaultAccount = AccountUtils.getCurrentOwnCloudAccount(this);
 960         if (defaultAccount == null) {
 961             SharedPreferences.Editor editor = PreferenceManager
 962                     .getDefaultSharedPreferences(this).edit();
 963             editor.putString("select_oc_account", accountName);
 964             editor.commit();
 965         }
 966
 967         /// prepare result to return to the Authenticator
 968         //  TODO check again what the Authenticator makes with it; probably has the same effect as addAccountExplicitly, but it's not well done
 969         final Intent intent = new Intent();
 970         intent.putExtra(AccountManager.KEY_ACCOUNT_TYPE,    AccountAuthenticator.ACCOUNT_TYPE);
 971         intent.putExtra(AccountManager.KEY_ACCOUNT_NAME,    mAccount.name);
 972         if (!isOAuth)
 973             intent.putExtra(AccountManager.KEY_AUTHTOKEN,   AccountAuthenticator.ACCOUNT_TYPE); // TODO check this; not sure it's right; maybe
 974         intent.putExtra(AccountManager.KEY_USERDATA,        username);
 975         if (isOAuth) {
 976             mAccountMgr.setAuthToken(mAccount, AccountAuthenticator.AUTH_TOKEN_TYPE_ACCESS_TOKEN, mOAuthAccessToken);
 977         }
 978         /// add user data to the new account; TODO probably can be done in the last parameter addAccountExplicitly, or in KEY_USERDATA
 979         mAccountMgr.setUserData(mAccount, AccountAuthenticator.KEY_OC_VERSION,    mDiscoveredVersion.toString());
 980         mAccountMgr.setUserData(mAccount, AccountAuthenticator.KEY_OC_BASE_URL,   mHostBaseUrl);
 981         if (isOAuth)
 982             mAccountMgr.setUserData(mAccount, AccountAuthenticator.KEY_SUPPORTS_OAUTH2, "TRUE");  // TODO this flag should be unnecessary
 983
 984         setAccountAuthenticatorResult(intent.getExtras());
 985         setResult(RESULT_OK, intent);
 986
 987         /// immediately request for the synchronization of the new account
 988         Bundle bundle = new Bundle();
 989         bundle.putBoolean(ContentResolver.SYNC_EXTRAS_MANUAL, true);
 990         ContentResolver.requestSync(mAccount, AccountAuthenticator.AUTHORITY, bundle);
 991     }
 992
 993
 994     /**
 995      * {@inheritDoc}
 996      *
 997      * Necessary to update the contents of the SSL Dialog
 998      *
 999      * TODO move to some common place for all possible untrusted SSL failures
1000      */
1001     @Override
1002     protected void onPrepareDialog(int id, Dialog dialog, Bundle args) {
1003         switch (id) {
1004         case DIALOG_LOGIN_PROGRESS:
1005         case DIALOG_CERT_NOT_SAVED:
1006         case DIALOG_OAUTH2_LOGIN_PROGRESS:
1007             break;
1008         case DIALOG_SSL_VALIDATOR: {
1009             ((SslValidatorDialog)dialog).updateResult(mLastSslUntrustedServerResult);
1010             break;
1011         }
1012         default:
1013             Log_OC.e(TAG, "Incorrect dialog called with id = " + id);
1014         }
1015     }
1016
1017
1018     /**
1019      * {@inheritDoc}
1020      */
1021     @Override
1022     protected Dialog onCreateDialog(int id) {
1023         Dialog dialog = null;
1024         switch (id) {
1025         case DIALOG_LOGIN_PROGRESS: {
1026             /// simple progress dialog
1027             ProgressDialog working_dialog = new ProgressDialog(this);
1028             working_dialog.setMessage(getResources().getString(R.string.auth_trying_to_login));
1029             working_dialog.setIndeterminate(true);
1030             working_dialog.setCancelable(true);
1031             working_dialog
1032                     .setOnCancelListener(new DialogInterface.OnCancelListener() {
1033                         @Override
1034                         public void onCancel(DialogInterface dialog) {
1035                             /// TODO study if this is enough
1036                             Log_OC.i(TAG, "Login canceled");
1037                             if (mOperationThread != null) {
1038                                 mOperationThread.interrupt();
1039                                 finish();
1040                             }
1041                         }
1042                     });
1043             dialog = working_dialog;
1044             break;
1045         }
1046         case DIALOG_OAUTH2_LOGIN_PROGRESS: {
1047             ProgressDialog working_dialog = new ProgressDialog(this);
1048             working_dialog.setMessage(String.format("Getting authorization"));
1049             working_dialog.setIndeterminate(true);
1050             working_dialog.setCancelable(true);
1051             working_dialog
1052             .setOnCancelListener(new DialogInterface.OnCancelListener() {
1053                 @Override
1054                 public void onCancel(DialogInterface dialog) {
1055                     Log_OC.i(TAG, "Login canceled");
1056                     finish();
1057                 }
1058             });
1059             dialog = working_dialog;
1060             break;
1061         }
1062         case DIALOG_SSL_VALIDATOR: {
1063             /// TODO start to use new dialog interface, at least for this (it is a FragmentDialog already)
1064             dialog = SslValidatorDialog.newInstance(this, mLastSslUntrustedServerResult, this);
1065             break;
1066         }
1067         case DIALOG_CERT_NOT_SAVED: {
1068             AlertDialog.Builder builder = new AlertDialog.Builder(this);
1069             builder.setMessage(getResources().getString(R.string.ssl_validator_not_saved));
1070             builder.setCancelable(false);
1071             builder.setPositiveButton(R.string.common_ok, new DialogInterface.OnClickListener() {
1072                     @Override
1073                     public void onClick(DialogInterface dialog, int which) {
1074                         dialog.dismiss();
1075                     };
1076                 });
1077             dialog = builder.create();
1078             break;
1079         }
1080         default:
1081             Log_OC.e(TAG, "Incorrect dialog called with id = " + id);
1082         }
1083         return dialog;
1084     }
1085
1086
1087     /**
1088      * Starts and activity to open the 'new account' page in the ownCloud web site
1089      *
1090      * @param view      'Account register' button
1091      */
1092     public void onRegisterClick(View view) {
1093         Intent register = new Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.url_account_register)));
1094         setResult(RESULT_CANCELED);
1095         startActivity(register);
1096     }
1097
1098
1099     /**
1100      * Updates the content and visibility state of the icon and text associated
1101      * to the last check on the ownCloud server.
1102      */
1103     private void showServerStatus() {
1104         TextView tv = (TextView) findViewById(R.id.server_status_text);
1105
1106         if (mServerStatusIcon == 0 && mServerStatusText == 0) {
1107             tv.setVisibility(View.INVISIBLE);
1108
1109         } else {
1110             tv.setText(mServerStatusText);
1111             tv.setCompoundDrawablesWithIntrinsicBounds(mServerStatusIcon, 0, 0, 0);
1112             tv.setVisibility(View.VISIBLE);
1113         }
1114
1115     }
1116
1117
1118     /**
1119      * Updates the content and visibility state of the icon and text associated
1120      * to the interactions with the OAuth authorization server.
1121      */
1122     private void showAuthStatus() {
1123         if (mAuthStatusIcon == 0 && mAuthStatusText == 0) {
1124             mAuthStatusLayout.setVisibility(View.INVISIBLE);
1125
1126         } else {
1127             mAuthStatusLayout.setText(mAuthStatusText);
1128             mAuthStatusLayout.setCompoundDrawablesWithIntrinsicBounds(mAuthStatusIcon, 0, 0, 0);
1129             mAuthStatusLayout.setVisibility(View.VISIBLE);
1130         }
1131     }
1132
1133
1134     private void showRefreshButton() {
1135         mHostUrlInput.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_action_refresh_black, 0);
1136     }
1137
1138     private void hideRefreshButton() {
1139         mHostUrlInput.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
1140     }
1141
1142     /**
1143      * Called when the refresh button in the input field for ownCloud host is clicked.
1144      *
1145      * Performs a new check on the URL in the input field.
1146      *
1147      * @param view      Refresh 'button'
1148      */
1149     public void onRefreshClick() {
1150         checkOcServer();
1151     }
1152
1153
1154
1155     /**
1156      * Called when the eye icon in the password field is clicked.
1157      *
1158      * Toggles the visibility of the password in the field.
1159      */
1160     public void onViewPasswordClick() {
1161         int selectionStart = mPasswordInput.getSelectionStart();
1162         int selectionEnd = mPasswordInput.getSelectionEnd();
1163         if (isPasswordVisible()) {
1164             hidePassword();
1165         } else {
1166             showPassword();
1167         }
1168         mPasswordInput.setSelection(selectionStart, selectionEnd);
1169     }
1170
1171
1172     /**
1173      * Called when the checkbox for OAuth authorization is clicked.
1174      *
1175      * Hides or shows the input fields for user & password.
1176      *
1177      * @param view      'View password' 'button'
1178      */
1179     public void onCheckClick(View view) {
1180         CheckBox oAuth2Check = (CheckBox)view;
1181         changeViewByOAuth2Check(oAuth2Check.isChecked());
1182
1183     }
1184
1185     /**
1186      * Changes the visibility of input elements depending upon the kind of authorization
1187      * chosen by the user: basic or OAuth
1188      *
1189      * @param checked       'True' when OAuth is selected.
1190      */
1191     public void changeViewByOAuth2Check(Boolean checked) {
1192
1193         if (checked) {
1194             mOAuthAuthEndpointText.setVisibility(View.VISIBLE);
1195             mOAuthTokenEndpointText.setVisibility(View.VISIBLE);
1196             mUsernameInput.setVisibility(View.GONE);
1197             mPasswordInput.setVisibility(View.GONE);
1198         } else {
1199             mOAuthAuthEndpointText.setVisibility(View.GONE);
1200             mOAuthTokenEndpointText.setVisibility(View.GONE);
1201             mUsernameInput.setVisibility(View.VISIBLE);
1202             mPasswordInput.setVisibility(View.VISIBLE);
1203         }
1204
1205     }
1206
1207     /**
1208      * Called from SslValidatorDialog when a new server certificate was correctly saved.
1209      */
1210     public void onSavedCertificate() {
1211         mOperationThread = mOcServerChkOperation.retry(this, mHandler);
1212     }
1213
1214     /**
1215      * Called from SslValidatorDialog when a new server certificate could not be saved
1216      * when the user requested it.
1217      */
1218     @Override
1219     public void onFailedSavingCertificate() {
1220         showDialog(DIALOG_CERT_NOT_SAVED);
1221     }
1222
1223
1224     /**
1225      *  Called when the 'action' button in an IME is pressed ('enter' in software keyboard).
1226      *
1227      *  Used to trigger the authorization check when the user presses 'enter' after writing the password.
1228      */
1229     @Override
1230     public boolean onEditorAction(TextView inputField, int actionId, KeyEvent event) {
1231         if (inputField != null && inputField.equals(mPasswordInput) &&
1232                 actionId == EditorInfo.IME_ACTION_DONE) {
1233             if (mOkButton.isEnabled()) {
1234                 mOkButton.performClick();
1235             }
1236         }
1237         return false;   // always return false to grant that the software keyboard is hidden anyway
1238     }
1239
1240
1241     private abstract static class RightDrawableOnTouchListener implements OnTouchListener  {
1242
1243         private int fuzz = 10;
1244
1245         /**
1246          * {@inheritDoc}
1247          */
1248         @Override
1249         public boolean onTouch(View view, MotionEvent event) {
1250             Drawable rightDrawable = null;
1251             if (view instanceof TextView) {
1252                 Drawable[] drawables = ((TextView)view).getCompoundDrawables();
1253                 if (drawables.length > 2) {
1254                     rightDrawable = drawables[2];
1255                 }
1256             }
1257             if (rightDrawable != null) {
1258                 final int x = (int) event.getX();
1259                 final int y = (int) event.getY();
1260                 final Rect bounds = rightDrawable.getBounds();
1261                 if (x >= (view.getRight() - bounds.width() - fuzz) && x <= (view.getRight() - view.getPaddingRight() + fuzz)
1262                     && y >= (view.getPaddingTop() - fuzz) && y <= (view.getHeight() - view.getPaddingBottom()) + fuzz) {
1263
1264                     return onDrawableTouch(event);
1265                 }
1266             }
1267             return false;
1268         }
1269
1270         public abstract boolean onDrawableTouch(final MotionEvent event);
1271     }
1272
1273 }