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