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) {
 408             if (!hasFocus) {
 409                 onUrlInputFocusLost((TextView) view);
 410             }
 411             else {
 412                 hideRefreshButton();
 413             }
 414
 415         } else if (view.getId() == R.id.account_password) {
 416             onPasswordFocusChanged((TextView) view, hasFocus);
 417         }
 418     }
 419
 420
 421     /**
 422      * Handles changes in focus on the text input for the server URL.
 423      *
 424      * IMPORTANT ENTRY POINT 2: When (!hasFocus), user wrote the server URL and changed to
 425      * other field. The operation to check the existence of the server in the entered URL is
 426      * started.
 427      *
 428      * When hasFocus:    user 'comes back' to write again the server URL.
 429      *
 430      * @param hostInput     TextView with the URL input field receiving the change of focus.
 431      */
 432     private void onUrlInputFocusLost(TextView hostInput) {
 433         if (!mHostBaseUrl.equals(normalizeUrl(mHostUrlInput.getText().toString()))) {
 434             checkOcServer();
 435         } else {
 436             mOkButton.setEnabled(mServerIsValid);
 437         }
 438     }
 439
 440
 441     private void checkOcServer() {
 442         String uri = mHostUrlInput.getText().toString().trim();
 443         mServerIsValid = false;
 444         mServerIsChecked = false;
 445         mOkButton.setEnabled(false);
 446         mDiscoveredVersion = null;
 447         hideRefreshButton();
 448         if (uri.length() != 0) {
 449             mServerStatusText = R.string.auth_testing_connection;
 450             mServerStatusIcon = R.drawable.progress_small;
 451             showServerStatus();
 452             mOcServerChkOperation = new  OwnCloudServerCheckOperation(uri, this);
 453             WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(uri), this);
 454             mOperationThread = mOcServerChkOperation.execute(client, this, mHandler);
 455         } else {
 456             mServerStatusText = 0;
 457             mServerStatusIcon = 0;
 458             showServerStatus();
 459         }
 460     }
 461
 462
 463     /**
 464      * Handles changes in focus on the text input for the password (basic authorization).
 465      *
 466      * When (hasFocus), the button to toggle password visibility is shown.
 467      *
 468      * When (!hasFocus), the button is made invisible and the password is hidden.
 469      *
 470      * @param passwordInput    TextView with the password input field receiving the change of focus.
 471      * @param hasFocus          'True' if focus is received, 'false' if is lost
 472      */
 473     private void onPasswordFocusChanged(TextView passwordInput, boolean hasFocus) {
 474         if (hasFocus) {
 475             showViewPasswordButton();
 476         } else {
 477             hidePassword();
 478             hidePasswordButton();
 479         }
 480     }
 481
 482
 483     private void showViewPasswordButton() {
 484         //int drawable = android.R.drawable.ic_menu_view;
 485         int drawable = R.drawable.ic_view;
 486         if (isPasswordVisible()) {
 487             //drawable = android.R.drawable.ic_secure;
 488             drawable = R.drawable.ic_hide;
 489         }
 490         mPasswordInput.setCompoundDrawablesWithIntrinsicBounds(0, 0, drawable, 0);
 491     }
 492
 493     private boolean isPasswordVisible() {
 494         return ((mPasswordInput.getInputType() & InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD) == InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
 495     }
 496
 497     private void hidePasswordButton() {
 498         mPasswordInput.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
 499     }
 500
 501     private void showPassword() {
 502         mPasswordInput.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
 503         showViewPasswordButton();
 504     }
 505
 506     private void hidePassword() {
 507         mPasswordInput.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
 508         showViewPasswordButton();
 509     }
 510
 511
 512     /**
 513      * Cancels the authenticator activity
 514      *
 515      * IMPORTANT ENTRY POINT 3: Never underestimate the importance of cancellation
 516      *
 517      * This method is bound in the layout/acceoun_setup.xml resource file.
 518      *
 519      * @param view      Cancel button
 520      */
 521     public void onCancelClick(View view) {
 522         setResult(RESULT_CANCELED);     // TODO review how is this related to AccountAuthenticator (debugging)
 523         finish();
 524     }
 525
 526
 527
 528     /**
 529      * Checks the credentials of the user in the root of the ownCloud server
 530      * before creating a new local account.
 531      *
 532      * For basic authorization, a check of existence of the root folder is
 533      * performed.
 534      *
 535      * For OAuth, starts the flow to get an access token; the credentials test
 536      * is postponed until it is available.
 537      *
 538      * IMPORTANT ENTRY POINT 4
 539      *
 540      * @param view      OK button
 541      */
 542     public void onOkClick(View view) {
 543         // this check should be unnecessary
 544         if (mDiscoveredVersion == null || !mDiscoveredVersion.isVersionValid()  || mHostBaseUrl == null || mHostBaseUrl.length() == 0) {
 545             mServerStatusIcon = R.drawable.common_error;
 546             mServerStatusText = R.string.auth_wtf_reenter_URL;
 547             showServerStatus();
 548             mOkButton.setEnabled(false);
 549             Log_OC.wtf(TAG,  "The user was allowed to click 'connect' to an unchecked server!!");
 550             return;
 551         }
 552
 553         if (mOAuth2Check.isChecked()) {
 554             startOauthorization();
 555
 556         } else {
 557             checkBasicAuthorization();
 558         }
 559     }
 560
 561
 562     /**
 563      * Tests the credentials entered by the user performing a check of existence on
 564      * the root folder of the ownCloud server.
 565      */
 566     private void checkBasicAuthorization() {
 567         /// get the path to the root folder through WebDAV from the version server
 568         String webdav_path = AccountUtils.getWebdavPath(mDiscoveredVersion, false);
 569
 570         /// get basic credentials entered by user
 571         String username = mUsernameInput.getText().toString();
 572         String password = mPasswordInput.getText().toString();
 573
 574         /// be gentle with the user
 575         showDialog(DIALOG_LOGIN_PROGRESS);
 576
 577         /// test credentials accessing the root folder
 578         mAuthCheckOperation = new  ExistenceCheckOperation("", this, false);
 579         WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(mHostBaseUrl + webdav_path), this);
 580         client.setBasicCredentials(username, password);
 581         mOperationThread = mAuthCheckOperation.execute(client, this, mHandler);
 582     }
 583
 584
 585     /**
 586      * Starts the OAuth 'grant type' flow to get an access token, with
 587      * a GET AUTHORIZATION request to the BUILT-IN authorization server.
 588      */
 589     private void startOauthorization() {
 590         // be gentle with the user
 591         mAuthStatusIcon = R.drawable.progress_small;
 592         mAuthStatusText = R.string.oauth_login_connection;
 593         showAuthStatus();
 594
 595         // GET AUTHORIZATION request
 596         //Uri uri = Uri.parse(getString(R.string.oauth2_url_endpoint_auth));
 597         Uri uri = Uri.parse(mOAuthAuthEndpointText.getText().toString().trim());
 598         Uri.Builder uriBuilder = uri.buildUpon();
 599         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_RESPONSE_TYPE, getString(R.string.oauth2_response_type));
 600         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_REDIRECT_URI, getString(R.string.oauth2_redirect_uri));
 601         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_CLIENT_ID, getString(R.string.oauth2_client_id));
 602         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_SCOPE, getString(R.string.oauth2_scope));
 603         //uriBuilder.appendQueryParameter(OAuth2Constants.KEY_STATE, whateverwewant);
 604         uri = uriBuilder.build();
 605         Log_OC.d(TAG, "Starting browser to view " + uri.toString());
 606         Intent i = new Intent(Intent.ACTION_VIEW, uri);
 607         startActivity(i);
 608     }
 609
 610
 611     /**
 612      * Callback method invoked when a RemoteOperation executed by this Activity finishes.
 613      *
 614      * Dispatches the operation flow to the right method.
 615      */
 616     @Override
 617     public void onRemoteOperationFinish(RemoteOperation operation, RemoteOperationResult result) {
 618
 619         if (operation instanceof OwnCloudServerCheckOperation) {
 620             onOcServerCheckFinish((OwnCloudServerCheckOperation) operation, result);
 621
 622         } else if (operation instanceof OAuth2GetAccessToken) {
 623             onGetOAuthAccessTokenFinish((OAuth2GetAccessToken)operation, result);
 624
 625         } else if (operation instanceof ExistenceCheckOperation)  {
 626             onAuthorizationCheckFinish((ExistenceCheckOperation)operation, result);
 627
 628         }
 629     }
 630
 631
 632     /**
 633      * Processes the result of the server check performed when the user finishes the enter of the
 634      * server URL.
 635      *
 636      * @param operation     Server check performed.
 637      * @param result        Result of the check.
 638      */
 639     private void onOcServerCheckFinish(OwnCloudServerCheckOperation operation, RemoteOperationResult result) {
 640         if (operation.equals(mOcServerChkOperation)) {
 641             /// save result state
 642             mServerIsChecked = true;
 643             mServerIsValid = result.isSuccess();
 644             mIsSslConn = (result.getCode() == ResultCode.OK_SSL);
 645             mOcServerChkOperation = null;
 646
 647             /// update status icon and text
 648             if (mServerIsValid) {
 649                 hideRefreshButton();
 650             } else {
 651                 showRefreshButton();
 652             }
 653             updateServerStatusIconAndText(result);
 654             showServerStatus();
 655
 656             /// very special case (TODO: move to a common place for all the remote operations)
 657             if (result.getCode() == ResultCode.SSL_RECOVERABLE_PEER_UNVERIFIED) {
 658                 mLastSslUntrustedServerResult = result;
 659                 showDialog(DIALOG_SSL_VALIDATOR);
 660             }
 661
 662             /// retrieve discovered version and normalize server URL
 663             mDiscoveredVersion = operation.getDiscoveredVersion();
 664             mHostBaseUrl = normalizeUrl(mHostUrlInput.getText().toString());
 665
 666             /// allow or not the user try to access the server
 667             mOkButton.setEnabled(mServerIsValid);
 668
 669         }   // else nothing ; only the last check operation is considered;
 670         // multiple can be triggered if the user amends a URL before a previous check can be triggered
 671     }
 672
 673
 674     private String normalizeUrl(String url) {
 675         if (url != null && url.length() > 0) {
 676             url = url.trim();
 677             if (!url.toLowerCase().startsWith("http://") &&
 678                     !url.toLowerCase().startsWith("https://")) {
 679                 if (mIsSslConn) {
 680                     url = "https://" + url;
 681                 } else {
 682                     url = "http://" + url;
 683                 }
 684
 685             }
 686             if (url.endsWith("/")) {
 687                 url = url.substring(0, url.length() - 1);
 688             }
 689         }
 690         return (url != null ? url : "");
 691     }
 692
 693     /**
 694      * Chooses the right icon and text to show to the user for the received operation result.
 695      *
 696      * @param result    Result of a remote operation performed in this activity
 697      */
 698     private void updateServerStatusIconAndText(RemoteOperationResult result) {
 699         mServerStatusIcon = R.drawable.common_error;    // the most common case in the switch below
 700
 701         switch (result.getCode()) {
 702         case OK_SSL:
 703             mServerStatusIcon = android.R.drawable.ic_secure;
 704             mServerStatusText = R.string.auth_secure_connection;
 705             break;
 706
 707         case OK_NO_SSL:
 708         case OK:
 709             if (mHostUrlInput.getText().toString().trim().toLowerCase().startsWith("http://") ) {
 710                 mServerStatusText = R.string.auth_connection_established;
 711                 mServerStatusIcon = R.drawable.ic_ok;
 712             } else {
 713                 mServerStatusText = R.string.auth_nossl_plain_ok_title;
 714                 mServerStatusIcon = android.R.drawable.ic_partial_secure;
 715             }
 716             break;
 717
 718         case NO_NETWORK_CONNECTION:
 719             mServerStatusIcon = R.drawable.no_network;
 720             mServerStatusText = R.string.auth_no_net_conn_title;
 721             break;
 722
 723         case SSL_RECOVERABLE_PEER_UNVERIFIED:
 724             mServerStatusText = R.string.auth_ssl_unverified_server_title;
 725             break;
 726         case BAD_OC_VERSION:
 727             mServerStatusText = R.string.auth_bad_oc_version_title;
 728             break;
 729         case WRONG_CONNECTION:
 730             mServerStatusText = R.string.auth_wrong_connection_title;
 731             break;
 732         case TIMEOUT:
 733             mServerStatusText = R.string.auth_timeout_title;
 734             break;
 735         case INCORRECT_ADDRESS:
 736             mServerStatusText = R.string.auth_incorrect_address_title;
 737             break;
 738         case SSL_ERROR:
 739             mServerStatusText = R.string.auth_ssl_general_error_title;
 740             break;
 741         case UNAUTHORIZED:
 742             mServerStatusText = R.string.auth_unauthorized;
 743             break;
 744         case HOST_NOT_AVAILABLE:
 745             mServerStatusText = R.string.auth_unknown_host_title;
 746             break;
 747         case INSTANCE_NOT_CONFIGURED:
 748             mServerStatusText = R.string.auth_not_configured_title;
 749             break;
 750         case FILE_NOT_FOUND:
 751             mServerStatusText = R.string.auth_incorrect_path_title;
 752             break;
 753         case OAUTH2_ERROR:
 754             mServerStatusText = R.string.auth_oauth_error;
 755             break;
 756         case OAUTH2_ERROR_ACCESS_DENIED:
 757             mServerStatusText = R.string.auth_oauth_error_access_denied;
 758             break;
 759         case UNHANDLED_HTTP_CODE:
 760         case UNKNOWN_ERROR:
 761             mServerStatusText = R.string.auth_unknown_error_title;
 762             break;
 763         default:
 764             mServerStatusText = 0;
 765             mServerStatusIcon = 0;
 766         }
 767     }
 768
 769
 770     /**
 771      * Chooses the right icon and text to show to the user for the received operation result.
 772      *
 773      * @param result    Result of a remote operation performed in this activity
 774      */
 775     private void updateAuthStatusIconAndText(RemoteOperationResult result) {
 776         mAuthStatusIcon = R.drawable.common_error;    // the most common case in the switch below
 777
 778         switch (result.getCode()) {
 779         case OK_SSL:
 780             mAuthStatusIcon = android.R.drawable.ic_secure;
 781             mAuthStatusText = R.string.auth_secure_connection;
 782             break;
 783
 784         case OK_NO_SSL:
 785         case OK:
 786             if (mHostUrlInput.getText().toString().trim().toLowerCase().startsWith("http://") ) {
 787                 mAuthStatusText = R.string.auth_connection_established;
 788                 mAuthStatusIcon = R.drawable.ic_ok;
 789             } else {
 790                 mAuthStatusText = R.string.auth_nossl_plain_ok_title;
 791                 mAuthStatusIcon = android.R.drawable.ic_partial_secure;
 792             }
 793             break;
 794
 795         case NO_NETWORK_CONNECTION:
 796             mAuthStatusIcon = R.drawable.no_network;
 797             mAuthStatusText = R.string.auth_no_net_conn_title;
 798             break;
 799
 800         case SSL_RECOVERABLE_PEER_UNVERIFIED:
 801             mAuthStatusText = R.string.auth_ssl_unverified_server_title;
 802             break;
 803         case BAD_OC_VERSION:
 804             mAuthStatusText = R.string.auth_bad_oc_version_title;
 805             break;
 806         case WRONG_CONNECTION:
 807             mAuthStatusText = R.string.auth_wrong_connection_title;
 808             break;
 809         case TIMEOUT:
 810             mAuthStatusText = R.string.auth_timeout_title;
 811             break;
 812         case INCORRECT_ADDRESS:
 813             mAuthStatusText = R.string.auth_incorrect_address_title;
 814             break;
 815         case SSL_ERROR:
 816             mAuthStatusText = R.string.auth_ssl_general_error_title;
 817             break;
 818         case UNAUTHORIZED:
 819             mAuthStatusText = R.string.auth_unauthorized;
 820             break;
 821         case HOST_NOT_AVAILABLE:
 822             mAuthStatusText = R.string.auth_unknown_host_title;
 823             break;
 824         case INSTANCE_NOT_CONFIGURED:
 825             mAuthStatusText = R.string.auth_not_configured_title;
 826             break;
 827         case FILE_NOT_FOUND:
 828             mAuthStatusText = R.string.auth_incorrect_path_title;
 829             break;
 830         case OAUTH2_ERROR:
 831             mAuthStatusText = R.string.auth_oauth_error;
 832             break;
 833         case OAUTH2_ERROR_ACCESS_DENIED:
 834             mAuthStatusText = R.string.auth_oauth_error_access_denied;
 835             break;
 836         case UNHANDLED_HTTP_CODE:
 837         case UNKNOWN_ERROR:
 838             mAuthStatusText = R.string.auth_unknown_error_title;
 839             break;
 840         default:
 841             mAuthStatusText = 0;
 842             mAuthStatusIcon = 0;
 843         }
 844     }
 845
 846
 847     /**
 848      * Processes the result of the request for and access token send
 849      * to an OAuth authorization server.
 850      *
 851      * @param operation     Operation performed requesting the access token.
 852      * @param result        Result of the operation.
 853      */
 854     private void onGetOAuthAccessTokenFinish(OAuth2GetAccessToken operation, RemoteOperationResult result) {
 855         try {
 856             dismissDialog(DIALOG_OAUTH2_LOGIN_PROGRESS);
 857         } catch (IllegalArgumentException e) {
 858             // NOTHING TO DO ; can't find out what situation that leads to the exception in this code, but user logs signal that it happens
 859         }
 860
 861         String webdav_path = AccountUtils.getWebdavPath(mDiscoveredVersion, true);
 862         if (result.isSuccess() && webdav_path != null) {
 863             /// be gentle with the user
 864             showDialog(DIALOG_LOGIN_PROGRESS);
 865
 866             /// time to test the retrieved access token on the ownCloud server
 867             mOAuthAccessToken = ((OAuth2GetAccessToken)operation).getResultTokenMap().get(OAuth2Constants.KEY_ACCESS_TOKEN);
 868             Log_OC.d(TAG, "Got ACCESS TOKEN: " + mOAuthAccessToken);
 869             mAuthCheckOperation = new ExistenceCheckOperation("", this, false);
 870             WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(mHostBaseUrl + webdav_path), this);
 871             client.setBearerCredentials(mOAuthAccessToken);
 872             mAuthCheckOperation.execute(client, this, mHandler);
 873
 874         } else {
 875             updateAuthStatusIconAndText(result);
 876             showAuthStatus();
 877             Log_OC.d(TAG, "Access failed: " + result.getLogMessage());
 878         }
 879     }
 880
 881
 882     /**
 883      * Processes the result of the access check performed to try the user credentials.
 884      *
 885      * Creates a new account through the AccountManager.
 886      *
 887      * @param operation     Access check performed.
 888      * @param result        Result of the operation.
 889      */
 890     private void onAuthorizationCheckFinish(ExistenceCheckOperation operation, RemoteOperationResult result) {
 891         try {
 892             dismissDialog(DIALOG_LOGIN_PROGRESS);
 893         } catch (IllegalArgumentException e) {
 894             // NOTHING TO DO ; can't find out what situation that leads to the exception in this code, but user logs signal that it happens
 895         }
 896
 897         if (result.isSuccess()) {
 898             Log_OC.d(TAG, "Successful access - time to save the account");
 899
 900             if (mAction == ACTION_CREATE) {
 901                 createAccount();
 902
 903             } else {
 904                 updateToken();
 905             }
 906
 907             finish();
 908
 909         } else {
 910             updateAuthStatusIconAndText(result);
 911             showAuthStatus();
 912             Log_OC.d(TAG, "Access failed: " + result.getLogMessage());
 913         }
 914     }
 915
 916
 917     /**
 918      * Sets the proper response to get that the Account Authenticator that started this activity saves
 919      * a new authorization token for mAccount.
 920      */
 921     private void updateToken() {
 922         Bundle response = new Bundle();
 923         response.putString(AccountManager.KEY_ACCOUNT_NAME, mAccount.name);
 924         response.putString(AccountManager.KEY_ACCOUNT_TYPE, mAccount.type);
 925         boolean isOAuth = mOAuth2Check.isChecked();
 926         if (isOAuth) {
 927             response.putString(AccountManager.KEY_AUTHTOKEN, mOAuthAccessToken);
 928             // the next line is necessary; by now, notifications are calling directly to the AuthenticatorActivity to update, without AccountManager intervention
 929             mAccountMgr.setAuthToken(mAccount, AccountAuthenticator.AUTH_TOKEN_TYPE_ACCESS_TOKEN, mOAuthAccessToken);
 930         } else {
 931             response.putString(AccountManager.KEY_AUTHTOKEN, mPasswordInput.getText().toString());
 932             mAccountMgr.setPassword(mAccount, mPasswordInput.getText().toString());
 933         }
 934         setAccountAuthenticatorResult(response);
 935     }
 936
 937
 938     /**
 939      * Creates a new account through the Account Authenticator that started this activity.
 940      *
 941      * This makes the account permanent.
 942      *
 943      * TODO Decide how to name the OAuth accounts
 944      */
 945     private void createAccount() {
 946         /// create and save new ownCloud account
 947         boolean isOAuth = mOAuth2Check.isChecked();
 948
 949         Uri uri = Uri.parse(mHostBaseUrl);
 950         String username = mUsernameInput.getText().toString().trim();
 951         if (isOAuth) {
 952             username = "OAuth_user" + (new java.util.Random(System.currentTimeMillis())).nextLong();
 953         }
 954         String accountName = username + "@" + uri.getHost();
 955         if (uri.getPort() >= 0) {
 956             accountName += ":" + uri.getPort();
 957         }
 958         mAccount = new Account(accountName, AccountAuthenticator.ACCOUNT_TYPE);
 959         if (isOAuth) {
 960             mAccountMgr.addAccountExplicitly(mAccount, "", null);  // with our implementation, the password is never input in the app
 961         } else {
 962             mAccountMgr.addAccountExplicitly(mAccount, mPasswordInput.getText().toString(), null);
 963         }
 964
 965         /// add the new account as default in preferences, if there is none already
 966         Account defaultAccount = AccountUtils.getCurrentOwnCloudAccount(this);
 967         if (defaultAccount == null) {
 968             SharedPreferences.Editor editor = PreferenceManager
 969                     .getDefaultSharedPreferences(this).edit();
 970             editor.putString("select_oc_account", accountName);
 971             editor.commit();
 972         }
 973
 974         /// prepare result to return to the Authenticator
 975         //  TODO check again what the Authenticator makes with it; probably has the same effect as addAccountExplicitly, but it's not well done
 976         final Intent intent = new Intent();
 977         intent.putExtra(AccountManager.KEY_ACCOUNT_TYPE,    AccountAuthenticator.ACCOUNT_TYPE);
 978         intent.putExtra(AccountManager.KEY_ACCOUNT_NAME,    mAccount.name);
 979         if (!isOAuth)
 980             intent.putExtra(AccountManager.KEY_AUTHTOKEN,   AccountAuthenticator.ACCOUNT_TYPE); // TODO check this; not sure it's right; maybe
 981         intent.putExtra(AccountManager.KEY_USERDATA,        username);
 982         if (isOAuth) {
 983             mAccountMgr.setAuthToken(mAccount, AccountAuthenticator.AUTH_TOKEN_TYPE_ACCESS_TOKEN, mOAuthAccessToken);
 984         }
 985         /// add user data to the new account; TODO probably can be done in the last parameter addAccountExplicitly, or in KEY_USERDATA
 986         mAccountMgr.setUserData(mAccount, AccountAuthenticator.KEY_OC_VERSION,    mDiscoveredVersion.toString());
 987         mAccountMgr.setUserData(mAccount, AccountAuthenticator.KEY_OC_BASE_URL,   mHostBaseUrl);
 988         if (isOAuth)
 989             mAccountMgr.setUserData(mAccount, AccountAuthenticator.KEY_SUPPORTS_OAUTH2, "TRUE");  // TODO this flag should be unnecessary
 990
 991         setAccountAuthenticatorResult(intent.getExtras());
 992         setResult(RESULT_OK, intent);
 993
 994         /// immediately request for the synchronization of the new account
 995         Bundle bundle = new Bundle();
 996         bundle.putBoolean(ContentResolver.SYNC_EXTRAS_MANUAL, true);
 997         ContentResolver.requestSync(mAccount, AccountAuthenticator.AUTHORITY, bundle);
 998     }
 999
1000
1001     /**
1002      * {@inheritDoc}
1003      *
1004      * Necessary to update the contents of the SSL Dialog
1005      *
1006      * TODO move to some common place for all possible untrusted SSL failures
1007      */
1008     @Override
1009     protected void onPrepareDialog(int id, Dialog dialog, Bundle args) {
1010         switch (id) {
1011         case DIALOG_LOGIN_PROGRESS:
1012         case DIALOG_CERT_NOT_SAVED:
1013         case DIALOG_OAUTH2_LOGIN_PROGRESS:
1014             break;
1015         case DIALOG_SSL_VALIDATOR: {
1016             ((SslValidatorDialog)dialog).updateResult(mLastSslUntrustedServerResult);
1017             break;
1018         }
1019         default:
1020             Log_OC.e(TAG, "Incorrect dialog called with id = " + id);
1021         }
1022     }
1023
1024
1025     /**
1026      * {@inheritDoc}
1027      */
1028     @Override
1029     protected Dialog onCreateDialog(int id) {
1030         Dialog dialog = null;
1031         switch (id) {
1032         case DIALOG_LOGIN_PROGRESS: {
1033             /// simple progress dialog
1034             ProgressDialog working_dialog = new ProgressDialog(this);
1035             working_dialog.setMessage(getResources().getString(R.string.auth_trying_to_login));
1036             working_dialog.setIndeterminate(true);
1037             working_dialog.setCancelable(true);
1038             working_dialog
1039             .setOnCancelListener(new DialogInterface.OnCancelListener() {
1040                 @Override
1041                 public void onCancel(DialogInterface dialog) {
1042                     /// TODO study if this is enough
1043                     Log_OC.i(TAG, "Login canceled");
1044                     if (mOperationThread != null) {
1045                         mOperationThread.interrupt();
1046                         finish();
1047                     }
1048                 }
1049             });
1050             dialog = working_dialog;
1051             break;
1052         }
1053         case DIALOG_OAUTH2_LOGIN_PROGRESS: {
1054             ProgressDialog working_dialog = new ProgressDialog(this);
1055             working_dialog.setMessage(String.format("Getting authorization"));
1056             working_dialog.setIndeterminate(true);
1057             working_dialog.setCancelable(true);
1058             working_dialog
1059             .setOnCancelListener(new DialogInterface.OnCancelListener() {
1060                 @Override
1061                 public void onCancel(DialogInterface dialog) {
1062                     Log_OC.i(TAG, "Login canceled");
1063                     finish();
1064                 }
1065             });
1066             dialog = working_dialog;
1067             break;
1068         }
1069         case DIALOG_SSL_VALIDATOR: {
1070             /// TODO start to use new dialog interface, at least for this (it is a FragmentDialog already)
1071             dialog = SslValidatorDialog.newInstance(this, mLastSslUntrustedServerResult, this);
1072             break;
1073         }
1074         case DIALOG_CERT_NOT_SAVED: {
1075             AlertDialog.Builder builder = new AlertDialog.Builder(this);
1076             builder.setMessage(getResources().getString(R.string.ssl_validator_not_saved));
1077             builder.setCancelable(false);
1078             builder.setPositiveButton(R.string.common_ok, new DialogInterface.OnClickListener() {
1079                 @Override
1080                 public void onClick(DialogInterface dialog, int which) {
1081                     dialog.dismiss();
1082                 };
1083             });
1084             dialog = builder.create();
1085             break;
1086         }
1087         default:
1088             Log_OC.e(TAG, "Incorrect dialog called with id = " + id);
1089         }
1090         return dialog;
1091     }
1092
1093
1094     /**
1095      * Starts and activity to open the 'new account' page in the ownCloud web site
1096      *
1097      * @param view      'Account register' button
1098      */
1099     public void onRegisterClick(View view) {
1100         Intent register = new Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.url_account_register)));
1101         setResult(RESULT_CANCELED);
1102         startActivity(register);
1103     }
1104
1105
1106     /**
1107      * Updates the content and visibility state of the icon and text associated
1108      * to the last check on the ownCloud server.
1109      */
1110     private void showServerStatus() {
1111         TextView tv = (TextView) findViewById(R.id.server_status_text);
1112
1113         if (mServerStatusIcon == 0 && mServerStatusText == 0) {
1114             tv.setVisibility(View.INVISIBLE);
1115
1116         } else {
1117             tv.setText(mServerStatusText);
1118             tv.setCompoundDrawablesWithIntrinsicBounds(mServerStatusIcon, 0, 0, 0);
1119             tv.setVisibility(View.VISIBLE);
1120         }
1121
1122     }
1123
1124
1125     /**
1126      * Updates the content and visibility state of the icon and text associated
1127      * to the interactions with the OAuth authorization server.
1128      */
1129     private void showAuthStatus() {
1130         if (mAuthStatusIcon == 0 && mAuthStatusText == 0) {
1131             mAuthStatusLayout.setVisibility(View.INVISIBLE);
1132
1133         } else {
1134             mAuthStatusLayout.setText(mAuthStatusText);
1135             mAuthStatusLayout.setCompoundDrawablesWithIntrinsicBounds(mAuthStatusIcon, 0, 0, 0);
1136             mAuthStatusLayout.setVisibility(View.VISIBLE);
1137         }
1138     }
1139
1140
1141     private void showRefreshButton() {
1142         mHostUrlInput.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_action_refresh_black, 0);
1143     }
1144
1145     private void hideRefreshButton() {
1146         mHostUrlInput.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
1147     }
1148
1149     /**
1150      * Called when the refresh button in the input field for ownCloud host is clicked.
1151      *
1152      * Performs a new check on the URL in the input field.
1153      *
1154      * @param view      Refresh 'button'
1155      */
1156     public void onRefreshClick() {
1157         checkOcServer();
1158     }
1159
1160
1161     /**
1162      * Called when the eye icon in the password field is clicked.
1163      *
1164      * Toggles the visibility of the password in the field.
1165      */
1166     public void onViewPasswordClick() {
1167         int selectionStart = mPasswordInput.getSelectionStart();
1168         int selectionEnd = mPasswordInput.getSelectionEnd();
1169         if (isPasswordVisible()) {
1170             hidePassword();
1171         } else {
1172             showPassword();
1173         }
1174         mPasswordInput.setSelection(selectionStart, selectionEnd);
1175     }
1176
1177
1178     /**
1179      * Called when the checkbox for OAuth authorization is clicked.
1180      *
1181      * Hides or shows the input fields for user & password.
1182      *
1183      * @param view      'View password' 'button'
1184      */
1185     public void onCheckClick(View view) {
1186         CheckBox oAuth2Check = (CheckBox)view;
1187         changeViewByOAuth2Check(oAuth2Check.isChecked());
1188
1189     }
1190
1191     /**
1192      * Changes the visibility of input elements depending upon the kind of authorization
1193      * chosen by the user: basic or OAuth
1194      *
1195      * @param checked       'True' when OAuth is selected.
1196      */
1197     public void changeViewByOAuth2Check(Boolean checked) {
1198
1199         if (checked) {
1200             mOAuthAuthEndpointText.setVisibility(View.VISIBLE);
1201             mOAuthTokenEndpointText.setVisibility(View.VISIBLE);
1202             mUsernameInput.setVisibility(View.GONE);
1203             mPasswordInput.setVisibility(View.GONE);
1204         } else {
1205             mOAuthAuthEndpointText.setVisibility(View.GONE);
1206             mOAuthTokenEndpointText.setVisibility(View.GONE);
1207             mUsernameInput.setVisibility(View.VISIBLE);
1208             mPasswordInput.setVisibility(View.VISIBLE);
1209         }
1210
1211     }
1212
1213     /**
1214      * Called from SslValidatorDialog when a new server certificate was correctly saved.
1215      */
1216     public void onSavedCertificate() {
1217         mOperationThread = mOcServerChkOperation.retry(this, mHandler);
1218     }
1219
1220     /**
1221      * Called from SslValidatorDialog when a new server certificate could not be saved
1222      * when the user requested it.
1223      */
1224     @Override
1225     public void onFailedSavingCertificate() {
1226         showDialog(DIALOG_CERT_NOT_SAVED);
1227     }
1228
1229
1230     /**
1231      *  Called when the 'action' button in an IME is pressed ('enter' in software keyboard).
1232      *
1233      *  Used to trigger the authorization check when the user presses 'enter' after writing the password.
1234      */
1235     @Override
1236     public boolean onEditorAction(TextView inputField, int actionId, KeyEvent event) {
1237         if (inputField != null && inputField.equals(mPasswordInput) &&
1238                 actionId == EditorInfo.IME_ACTION_DONE) {
1239             if (mOkButton.isEnabled()) {
1240                 mOkButton.performClick();
1241             }
1242         }
1243         return false;   // always return false to grant that the software keyboard is hidden anyway
1244     }
1245
1246
1247     private abstract static class RightDrawableOnTouchListener implements OnTouchListener  {
1248
1249         private int fuzz = 75;
1250
1251         /**
1252          * {@inheritDoc}
1253          */
1254         @Override
1255         public boolean onTouch(View view, MotionEvent event) {
1256             Drawable rightDrawable = null;
1257             if (view instanceof TextView) {
1258                 Drawable[] drawables = ((TextView)view).getCompoundDrawables();
1259                 if (drawables.length > 2) {
1260                     rightDrawable = drawables[2];
1261                 }
1262             }
1263             if (rightDrawable != null) {
1264                 final int x = (int) event.getX();
1265                 final int y = (int) event.getY();
1266                 final Rect bounds = rightDrawable.getBounds();
1267                 if (x >= (view.getRight() - bounds.width() - fuzz) && x <= (view.getRight() - view.getPaddingRight() + fuzz)
1268                     && y >= (view.getPaddingTop() - fuzz) && y <= (view.getHeight() - view.getPaddingBottom()) + fuzz) {
1269
1270                     return onDrawableTouch(event);
1271                 }
1272             }
1273             return false;
1274         }
1275
1276         public abstract boolean onDrawableTouch(final MotionEvent event);
1277     }
1278
1279 }