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     private static final String KEY_REFRESH_BUTTON_ENABLED = "KEY_REFRESH_BUTTON_ENABLED";
 101
 102     private static final String OAUTH_MODE_ON = "on";
 103     private static final String OAUTH_MODE_OFF = "off";
 104     private static final String OAUTH_MODE_OPTIONAL = "optional";
 105
 106     private static final int DIALOG_LOGIN_PROGRESS = 0;
 107     private static final int DIALOG_SSL_VALIDATOR = 1;
 108     private static final int DIALOG_CERT_NOT_SAVED = 2;
 109     private static final int DIALOG_OAUTH2_LOGIN_PROGRESS = 3;
 110
 111     public static final byte ACTION_CREATE = 0;
 112     public static final byte ACTION_UPDATE_TOKEN = 1;
 113
 114
 115     private String mHostBaseUrl;
 116     private OwnCloudVersion mDiscoveredVersion;
 117
 118     private int mServerStatusText, mServerStatusIcon;
 119     private boolean mServerIsChecked, mServerIsValid, mIsSslConn;
 120     private int mAuthStatusText, mAuthStatusIcon;
 121
 122     private final Handler mHandler = new Handler();
 123     private Thread mOperationThread;
 124     private OwnCloudServerCheckOperation mOcServerChkOperation;
 125     private ExistenceCheckOperation mAuthCheckOperation;
 126     private RemoteOperationResult mLastSslUntrustedServerResult;
 127
 128     private Uri mNewCapturedUriFromOAuth2Redirection;
 129
 130     private AccountManager mAccountMgr;
 131     private boolean mJustCreated;
 132     private byte mAction;
 133     private Account mAccount;
 134
 135     private EditText mHostUrlInput;
 136     private EditText mUsernameInput;
 137     private EditText mPasswordInput;
 138     private CheckBox mOAuth2Check;
 139     private String mOAuthAccessToken;
 140     private View mOkButton;
 141     private TextView mAuthStatusLayout;
 142
 143     private TextView mOAuthAuthEndpointText;
 144     private TextView mOAuthTokenEndpointText;
 145
 146     private boolean mRefreshButtonEnabled;
 147
 148
 149     /**
 150      * {@inheritDoc}
 151      *
 152      * IMPORTANT ENTRY POINT 1: activity is shown to the user
 153      */
 154     @Override
 155     protected void onCreate(Bundle savedInstanceState) {
 156         super.onCreate(savedInstanceState);
 157         getWindow().requestFeature(Window.FEATURE_NO_TITLE);
 158
 159         /// set view and get references to view elements
 160         setContentView(R.layout.account_setup);
 161         mHostUrlInput = (EditText) findViewById(R.id.hostUrlInput);
 162         mUsernameInput = (EditText) findViewById(R.id.account_username);
 163         mPasswordInput = (EditText) findViewById(R.id.account_password);
 164         mOAuthAuthEndpointText = (TextView)findViewById(R.id.oAuthEntryPoint_1);
 165         mOAuthTokenEndpointText = (TextView)findViewById(R.id.oAuthEntryPoint_2);
 166         mOAuth2Check = (CheckBox) findViewById(R.id.oauth_onOff_check);
 167         mOkButton = findViewById(R.id.buttonOK);
 168         mAuthStatusLayout = (TextView) findViewById(R.id.auth_status_text);
 169
 170         /// complete label for 'register account' button
 171         Button b = (Button) findViewById(R.id.account_register);
 172         if (b != null) {
 173             b.setText(String.format(getString(R.string.auth_register), getString(R.string.app_name)));
 174         }
 175
 176         /// initialization
 177         mAccountMgr = AccountManager.get(this);
 178         mNewCapturedUriFromOAuth2Redirection = null;
 179         mAction = getIntent().getByteExtra(EXTRA_ACTION, ACTION_CREATE);
 180         mAccount = null;
 181         mHostBaseUrl = "";
 182
 183         if (savedInstanceState == null) {
 184             /// connection state and info
 185             mServerStatusText = mServerStatusIcon = 0;
 186             mServerIsValid = false;
 187             mServerIsChecked = false;
 188             mIsSslConn = false;
 189             mAuthStatusText = mAuthStatusIcon = 0;
 190
 191             /// retrieve extras from intent
 192             String tokenType = getIntent().getExtras().getString(AccountAuthenticator.KEY_AUTH_TOKEN_TYPE);
 193             boolean oAuthRequired = AccountAuthenticator.AUTH_TOKEN_TYPE_ACCESS_TOKEN.equals(tokenType) || OAUTH_MODE_ON.equals(getString(R.string.oauth2_mode));
 194
 195             mAccount = getIntent().getExtras().getParcelable(EXTRA_ACCOUNT);
 196             if (mAccount != null) {
 197                 String ocVersion = mAccountMgr.getUserData(mAccount, AccountAuthenticator.KEY_OC_VERSION);
 198                 if (ocVersion != null) {
 199                     mDiscoveredVersion = new OwnCloudVersion(ocVersion);
 200                 }
 201                 mHostBaseUrl = normalizeUrl(mAccountMgr.getUserData(mAccount, AccountAuthenticator.KEY_OC_BASE_URL));
 202                 mHostUrlInput.setText(mHostBaseUrl);
 203                 String userName = mAccount.name.substring(0, mAccount.name.lastIndexOf('@'));
 204                 mUsernameInput.setText(userName);
 205                 oAuthRequired = (mAccountMgr.getUserData(mAccount, AccountAuthenticator.KEY_SUPPORTS_OAUTH2) != null);
 206             }
 207             mOAuth2Check.setChecked(oAuthRequired);
 208             changeViewByOAuth2Check(oAuthRequired);
 209
 210
 211         } else {
 212             /// connection state and info
 213             mServerIsValid = savedInstanceState.getBoolean(KEY_SERVER_VALID);
 214             mServerIsChecked = savedInstanceState.getBoolean(KEY_SERVER_CHECKED);
 215             mServerStatusText = savedInstanceState.getInt(KEY_SERVER_STATUS_TEXT);
 216             mServerStatusIcon = savedInstanceState.getInt(KEY_SERVER_STATUS_ICON);
 217             mIsSslConn = savedInstanceState.getBoolean(KEY_IS_SSL_CONN);
 218             mAuthStatusText = savedInstanceState.getInt(KEY_AUTH_STATUS_TEXT);
 219             mAuthStatusIcon = savedInstanceState.getInt(KEY_AUTH_STATUS_ICON);
 220             if (savedInstanceState.getBoolean(KEY_PASSWORD_VISIBLE, false)) {
 221                 showPassword();
 222             }
 223
 224             /// server data
 225             String ocVersion = savedInstanceState.getString(KEY_OC_VERSION);
 226             if (ocVersion != null) {
 227                 mDiscoveredVersion = new OwnCloudVersion(ocVersion);
 228             }
 229             mHostBaseUrl = savedInstanceState.getString(KEY_HOST_URL_TEXT);
 230
 231             // account data, if updating
 232             mAccount = savedInstanceState.getParcelable(KEY_ACCOUNT);
 233
 234             // check if server check was interrupted by a configuration change
 235             if (savedInstanceState.getBoolean(KEY_SERVER_CHECK_IN_PROGRESS, false)) {
 236                 checkOcServer();
 237             }
 238
 239             // refresh button enabled
 240             mRefreshButtonEnabled = savedInstanceState.getBoolean(KEY_REFRESH_BUTTON_ENABLED);
 241
 242         }
 243
 244         showServerStatus();
 245         showAuthStatus();
 246         if (mServerIsChecked && !mServerIsValid && mRefreshButtonEnabled) showRefreshButton();
 247         mOkButton.setEnabled(mServerIsValid); // state not automatically recovered in configuration changes
 248
 249         if (!OAUTH_MODE_OPTIONAL.equals(getString(R.string.oauth2_mode))) {
 250             mOAuth2Check.setVisibility(View.GONE);
 251         }
 252
 253         if (mAction == ACTION_UPDATE_TOKEN) {
 254             /// lock things that should not change
 255             mHostUrlInput.setEnabled(false);
 256             mUsernameInput.setEnabled(false);
 257             mOAuth2Check.setVisibility(View.GONE);
 258             if (!mServerIsValid && mOcServerChkOperation == null) {
 259                 checkOcServer();
 260             }
 261         }
 262
 263         mPasswordInput.setText("");     // clean password to avoid social hacking (disadvantage: password in removed if the device is turned aside)
 264         mJustCreated = true;
 265
 266         /// bind view elements to listeners
 267         mHostUrlInput.setOnFocusChangeListener(this);
 268         mHostUrlInput.setOnTouchListener(new RightDrawableOnTouchListener() {
 269             @Override
 270             public boolean onDrawableTouch(final MotionEvent event) {
 271                 if (event.getAction() == MotionEvent.ACTION_UP) {
 272                     AuthenticatorActivity.this.onRefreshClick();
 273                 }
 274                 return true;
 275             }
 276         });
 277         mHostUrlInput.addTextChangedListener(new TextWatcher() {
 278
 279             @Override
 280             public void afterTextChanged(Editable s) {
 281                 if (!mHostBaseUrl.equals(normalizeUrl(mHostUrlInput.getText().toString()))) {
 282                     mOkButton.setEnabled(false);
 283                 }
 284             }
 285
 286             @Override
 287             public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
 288
 289             @Override
 290             public void onTextChanged(CharSequence s, int start, int before, int count) {}
 291
 292         });
 293         mPasswordInput.setOnFocusChangeListener(this);
 294         mPasswordInput.setImeOptions(EditorInfo.IME_ACTION_DONE);
 295         mPasswordInput.setOnEditorActionListener(this);
 296         mPasswordInput.setOnTouchListener(new RightDrawableOnTouchListener() {
 297             @Override
 298             public boolean onDrawableTouch(final MotionEvent event) {
 299                 if (event.getAction() == MotionEvent.ACTION_UP) {
 300                     AuthenticatorActivity.this.onViewPasswordClick();
 301                 }
 302                 return true;
 303             }
 304         });
 305     }
 306
 307     /**
 308      * Saves relevant state before {@link #onPause()}
 309      *
 310      * Do NOT save {@link #mNewCapturedUriFromOAuth2Redirection}; it keeps a temporal flag, intended to defer the
 311      * processing of the redirection caught in {@link #onNewIntent(Intent)} until {@link #onResume()}
 312      *
 313      * See {@link #loadSavedInstanceState(Bundle)}
 314      */
 315     @Override
 316     protected void onSaveInstanceState(Bundle outState) {
 317         super.onSaveInstanceState(outState);
 318
 319         /// connection state and info
 320         outState.putInt(KEY_SERVER_STATUS_TEXT, mServerStatusText);
 321         outState.putInt(KEY_SERVER_STATUS_ICON, mServerStatusIcon);
 322         outState.putBoolean(KEY_SERVER_VALID, mServerIsValid);
 323         outState.putBoolean(KEY_SERVER_CHECKED, mServerIsChecked);
 324         outState.putBoolean(KEY_SERVER_CHECK_IN_PROGRESS, (!mServerIsValid && mOcServerChkOperation != null));
 325         outState.putBoolean(KEY_IS_SSL_CONN, mIsSslConn);
 326         outState.putBoolean(KEY_PASSWORD_VISIBLE, isPasswordVisible());
 327         outState.putInt(KEY_AUTH_STATUS_ICON, mAuthStatusIcon);
 328         outState.putInt(KEY_AUTH_STATUS_TEXT, mAuthStatusText);
 329
 330         /// server data
 331         if (mDiscoveredVersion != null) {
 332             outState.putString(KEY_OC_VERSION, mDiscoveredVersion.toString());
 333         }
 334         outState.putString(KEY_HOST_URL_TEXT, mHostBaseUrl);
 335
 336         /// account data, if updating
 337         if (mAccount != null) {
 338             outState.putParcelable(KEY_ACCOUNT, mAccount);
 339         }
 340
 341         // refresh button enabled
 342         outState.putBoolean(KEY_REFRESH_BUTTON_ENABLED, mRefreshButtonEnabled);
 343
 344     }
 345
 346
 347     /**
 348      * The redirection triggered by the OAuth authentication server as response to the GET AUTHORIZATION request
 349      * is caught here.
 350      *
 351      * To make this possible, this activity needs to be qualified with android:launchMode = "singleTask" in the
 352      * AndroidManifest.xml file.
 353      */
 354     @Override
 355     protected void onNewIntent (Intent intent) {
 356         Log_OC.d(TAG, "onNewIntent()");
 357         Uri data = intent.getData();
 358         if (data != null && data.toString().startsWith(getString(R.string.oauth2_redirect_uri))) {
 359             mNewCapturedUriFromOAuth2Redirection = data;
 360         }
 361     }
 362
 363
 364     /**
 365      * The redirection triggered by the OAuth authentication server as response to the GET AUTHORIZATION, and
 366      * deferred in {@link #onNewIntent(Intent)}, is processed here.
 367      */
 368     @Override
 369     protected void onResume() {
 370         super.onResume();
 371         // the state of mOAuth2Check is automatically recovered between configuration changes, but not before onCreate() finishes; so keep the next lines here
 372         changeViewByOAuth2Check(mOAuth2Check.isChecked());
 373         if (mAction == ACTION_UPDATE_TOKEN && mJustCreated) {
 374             if (mOAuth2Check.isChecked())
 375                 Toast.makeText(this, R.string.auth_expired_oauth_token_toast, Toast.LENGTH_LONG).show();
 376             else
 377                 Toast.makeText(this, R.string.auth_expired_basic_auth_toast, Toast.LENGTH_LONG).show();
 378         }
 379
 380         if (mNewCapturedUriFromOAuth2Redirection != null) {
 381             getOAuth2AccessTokenFromCapturedRedirection();
 382         }
 383
 384         mJustCreated = false;
 385     }
 386
 387
 388     /**
 389      * Parses the redirection with the response to the GET AUTHORIZATION request to the
 390      * oAuth server and requests for the access token (GET ACCESS TOKEN)
 391      */
 392     private void getOAuth2AccessTokenFromCapturedRedirection() {
 393         /// Parse data from OAuth redirection
 394         String queryParameters = mNewCapturedUriFromOAuth2Redirection.getQuery();
 395         mNewCapturedUriFromOAuth2Redirection = null;
 396
 397         /// Showing the dialog with instructions for the user.
 398         showDialog(DIALOG_OAUTH2_LOGIN_PROGRESS);
 399
 400         /// GET ACCESS TOKEN to the oAuth server
 401         RemoteOperation operation = new OAuth2GetAccessToken(   getString(R.string.oauth2_client_id),
 402                 getString(R.string.oauth2_redirect_uri),
 403                 getString(R.string.oauth2_grant_type),
 404                 queryParameters);
 405         //WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(getString(R.string.oauth2_url_endpoint_access)), getApplicationContext());
 406         WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(mOAuthTokenEndpointText.getText().toString().trim()), getApplicationContext());
 407         operation.execute(client, this, mHandler);
 408     }
 409
 410
 411
 412     /**
 413      * Handles the change of focus on the text inputs for the server URL and the password
 414      */
 415     public void onFocusChange(View view, boolean hasFocus) {
 416         if (view.getId() == R.id.hostUrlInput) {
 417             if (!hasFocus) {
 418                 onUrlInputFocusLost((TextView) view);
 419                 if (!mServerIsValid) {
 420                     showRefreshButton();
 421                 }
 422             }
 423             else {
 424                 hideRefreshButton();
 425             }
 426
 427         } else if (view.getId() == R.id.account_password) {
 428             onPasswordFocusChanged((TextView) view, hasFocus);
 429         }
 430     }
 431
 432
 433     /**
 434      * Handles changes in focus on the text input for the server URL.
 435      *
 436      * IMPORTANT ENTRY POINT 2: When (!hasFocus), user wrote the server URL and changed to
 437      * other field. The operation to check the existence of the server in the entered URL is
 438      * started.
 439      *
 440      * When hasFocus:    user 'comes back' to write again the server URL.
 441      *
 442      * @param hostInput     TextView with the URL input field receiving the change of focus.
 443      */
 444     private void onUrlInputFocusLost(TextView hostInput) {
 445         if (!mHostBaseUrl.equals(normalizeUrl(mHostUrlInput.getText().toString()))) {
 446             checkOcServer();
 447         } else {
 448             mOkButton.setEnabled(mServerIsValid);
 449         }
 450     }
 451
 452
 453     private void checkOcServer() {
 454         String uri = mHostUrlInput.getText().toString().trim();
 455         mServerIsValid = false;
 456         mServerIsChecked = false;
 457         mOkButton.setEnabled(false);
 458         mDiscoveredVersion = null;
 459         hideRefreshButton();
 460         if (uri.length() != 0) {
 461             mServerStatusText = R.string.auth_testing_connection;
 462             mServerStatusIcon = R.drawable.progress_small;
 463             showServerStatus();
 464             mOcServerChkOperation = new  OwnCloudServerCheckOperation(uri, this);
 465             WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(uri), this);
 466             mOperationThread = mOcServerChkOperation.execute(client, this, mHandler);
 467         } else {
 468             mServerStatusText = 0;
 469             mServerStatusIcon = 0;
 470             showServerStatus();
 471         }
 472     }
 473
 474
 475     /**
 476      * Handles changes in focus on the text input for the password (basic authorization).
 477      *
 478      * When (hasFocus), the button to toggle password visibility is shown.
 479      *
 480      * When (!hasFocus), the button is made invisible and the password is hidden.
 481      *
 482      * @param passwordInput    TextView with the password input field receiving the change of focus.
 483      * @param hasFocus          'True' if focus is received, 'false' if is lost
 484      */
 485     private void onPasswordFocusChanged(TextView passwordInput, boolean hasFocus) {
 486         if (hasFocus) {
 487             showViewPasswordButton();
 488         } else {
 489             hidePassword();
 490             hidePasswordButton();
 491         }
 492     }
 493
 494
 495     private void showViewPasswordButton() {
 496         //int drawable = android.R.drawable.ic_menu_view;
 497         int drawable = R.drawable.ic_view;
 498         if (isPasswordVisible()) {
 499             //drawable = android.R.drawable.ic_secure;
 500             drawable = R.drawable.ic_hide;
 501         }
 502         mPasswordInput.setCompoundDrawablesWithIntrinsicBounds(0, 0, drawable, 0);
 503     }
 504
 505     private boolean isPasswordVisible() {
 506         return ((mPasswordInput.getInputType() & InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD) == InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
 507     }
 508
 509     private void hidePasswordButton() {
 510         mPasswordInput.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
 511     }
 512
 513     private void showPassword() {
 514         mPasswordInput.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
 515         showViewPasswordButton();
 516     }
 517
 518     private void hidePassword() {
 519         mPasswordInput.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
 520         showViewPasswordButton();
 521     }
 522
 523
 524     /**
 525      * Cancels the authenticator activity
 526      *
 527      * IMPORTANT ENTRY POINT 3: Never underestimate the importance of cancellation
 528      *
 529      * This method is bound in the layout/acceoun_setup.xml resource file.
 530      *
 531      * @param view      Cancel button
 532      */
 533     public void onCancelClick(View view) {
 534         setResult(RESULT_CANCELED);     // TODO review how is this related to AccountAuthenticator (debugging)
 535         finish();
 536     }
 537
 538
 539
 540     /**
 541      * Checks the credentials of the user in the root of the ownCloud server
 542      * before creating a new local account.
 543      *
 544      * For basic authorization, a check of existence of the root folder is
 545      * performed.
 546      *
 547      * For OAuth, starts the flow to get an access token; the credentials test
 548      * is postponed until it is available.
 549      *
 550      * IMPORTANT ENTRY POINT 4
 551      *
 552      * @param view      OK button
 553      */
 554     public void onOkClick(View view) {
 555         // this check should be unnecessary
 556         if (mDiscoveredVersion == null || !mDiscoveredVersion.isVersionValid()  || mHostBaseUrl == null || mHostBaseUrl.length() == 0) {
 557             mServerStatusIcon = R.drawable.common_error;
 558             mServerStatusText = R.string.auth_wtf_reenter_URL;
 559             showServerStatus();
 560             mOkButton.setEnabled(false);
 561             Log_OC.wtf(TAG,  "The user was allowed to click 'connect' to an unchecked server!!");
 562             return;
 563         }
 564
 565         if (mOAuth2Check.isChecked()) {
 566             startOauthorization();
 567
 568         } else {
 569             checkBasicAuthorization();
 570         }
 571     }
 572
 573
 574     /**
 575      * Tests the credentials entered by the user performing a check of existence on
 576      * the root folder of the ownCloud server.
 577      */
 578     private void checkBasicAuthorization() {
 579         /// get the path to the root folder through WebDAV from the version server
 580         String webdav_path = AccountUtils.getWebdavPath(mDiscoveredVersion, false);
 581
 582         /// get basic credentials entered by user
 583         String username = mUsernameInput.getText().toString();
 584         String password = mPasswordInput.getText().toString();
 585
 586         /// be gentle with the user
 587         showDialog(DIALOG_LOGIN_PROGRESS);
 588
 589         /// test credentials accessing the root folder
 590         mAuthCheckOperation = new  ExistenceCheckOperation("", this, false);
 591         WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(mHostBaseUrl + webdav_path), this);
 592         client.setBasicCredentials(username, password);
 593         mOperationThread = mAuthCheckOperation.execute(client, this, mHandler);
 594     }
 595
 596
 597     /**
 598      * Starts the OAuth 'grant type' flow to get an access token, with
 599      * a GET AUTHORIZATION request to the BUILT-IN authorization server.
 600      */
 601     private void startOauthorization() {
 602         // be gentle with the user
 603         mAuthStatusIcon = R.drawable.progress_small;
 604         mAuthStatusText = R.string.oauth_login_connection;
 605         showAuthStatus();
 606
 607         // GET AUTHORIZATION request
 608         //Uri uri = Uri.parse(getString(R.string.oauth2_url_endpoint_auth));
 609         Uri uri = Uri.parse(mOAuthAuthEndpointText.getText().toString().trim());
 610         Uri.Builder uriBuilder = uri.buildUpon();
 611         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_RESPONSE_TYPE, getString(R.string.oauth2_response_type));
 612         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_REDIRECT_URI, getString(R.string.oauth2_redirect_uri));
 613         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_CLIENT_ID, getString(R.string.oauth2_client_id));
 614         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_SCOPE, getString(R.string.oauth2_scope));
 615         //uriBuilder.appendQueryParameter(OAuth2Constants.KEY_STATE, whateverwewant);
 616         uri = uriBuilder.build();
 617         Log_OC.d(TAG, "Starting browser to view " + uri.toString());
 618         Intent i = new Intent(Intent.ACTION_VIEW, uri);
 619         startActivity(i);
 620     }
 621
 622
 623     /**
 624      * Callback method invoked when a RemoteOperation executed by this Activity finishes.
 625      *
 626      * Dispatches the operation flow to the right method.
 627      */
 628     @Override
 629     public void onRemoteOperationFinish(RemoteOperation operation, RemoteOperationResult result) {
 630
 631         if (operation instanceof OwnCloudServerCheckOperation) {
 632             onOcServerCheckFinish((OwnCloudServerCheckOperation) operation, result);
 633
 634         } else if (operation instanceof OAuth2GetAccessToken) {
 635             onGetOAuthAccessTokenFinish((OAuth2GetAccessToken)operation, result);
 636
 637         } else if (operation instanceof ExistenceCheckOperation)  {
 638             onAuthorizationCheckFinish((ExistenceCheckOperation)operation, result);
 639
 640         }
 641     }
 642
 643
 644     /**
 645      * Processes the result of the server check performed when the user finishes the enter of the
 646      * server URL.
 647      *
 648      * @param operation     Server check performed.
 649      * @param result        Result of the check.
 650      */
 651     private void onOcServerCheckFinish(OwnCloudServerCheckOperation operation, RemoteOperationResult result) {
 652         if (operation.equals(mOcServerChkOperation)) {
 653             /// save result state
 654             mServerIsChecked = true;
 655             mServerIsValid = result.isSuccess();
 656             mIsSslConn = (result.getCode() == ResultCode.OK_SSL);
 657             mOcServerChkOperation = null;
 658
 659             /// update status icon and text
 660             if (mServerIsValid) {
 661                 hideRefreshButton();
 662             } else {
 663                 showRefreshButton();
 664             }
 665             updateServerStatusIconAndText(result);
 666             showServerStatus();
 667
 668             /// very special case (TODO: move to a common place for all the remote operations)
 669             if (result.getCode() == ResultCode.SSL_RECOVERABLE_PEER_UNVERIFIED) {
 670                 mLastSslUntrustedServerResult = result;
 671                 showDialog(DIALOG_SSL_VALIDATOR);
 672             }
 673
 674             /// retrieve discovered version and normalize server URL
 675             mDiscoveredVersion = operation.getDiscoveredVersion();
 676             mHostBaseUrl = normalizeUrl(mHostUrlInput.getText().toString());
 677
 678             /// allow or not the user try to access the server
 679             mOkButton.setEnabled(mServerIsValid);
 680
 681         }   // else nothing ; only the last check operation is considered;
 682         // multiple can be triggered if the user amends a URL before a previous check can be triggered
 683     }
 684
 685
 686     private String normalizeUrl(String url) {
 687         if (url != null && url.length() > 0) {
 688             url = url.trim();
 689             if (!url.toLowerCase().startsWith("http://") &&
 690                     !url.toLowerCase().startsWith("https://")) {
 691                 if (mIsSslConn) {
 692                     url = "https://" + url;
 693                 } else {
 694                     url = "http://" + url;
 695                 }
 696
 697             }
 698             if (url.endsWith("/")) {
 699                 url = url.substring(0, url.length() - 1);
 700             }
 701         }
 702         return (url != null ? url : "");
 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 updateServerStatusIconAndText(RemoteOperationResult result) {
 711         mServerStatusIcon = R.drawable.common_error;    // the most common case in the switch below
 712
 713         switch (result.getCode()) {
 714         case OK_SSL:
 715             mServerStatusIcon = android.R.drawable.ic_secure;
 716             mServerStatusText = 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                 mServerStatusText = R.string.auth_connection_established;
 723                 mServerStatusIcon = R.drawable.ic_ok;
 724             } else {
 725                 mServerStatusText = R.string.auth_nossl_plain_ok_title;
 726                 mServerStatusIcon = android.R.drawable.ic_partial_secure;
 727             }
 728             break;
 729
 730         case NO_NETWORK_CONNECTION:
 731             mServerStatusIcon = R.drawable.no_network;
 732             mServerStatusText = R.string.auth_no_net_conn_title;
 733             break;
 734
 735         case SSL_RECOVERABLE_PEER_UNVERIFIED:
 736             mServerStatusText = R.string.auth_ssl_unverified_server_title;
 737             break;
 738         case BAD_OC_VERSION:
 739             mServerStatusText = R.string.auth_bad_oc_version_title;
 740             break;
 741         case WRONG_CONNECTION:
 742             mServerStatusText = R.string.auth_wrong_connection_title;
 743             break;
 744         case TIMEOUT:
 745             mServerStatusText = R.string.auth_timeout_title;
 746             break;
 747         case INCORRECT_ADDRESS:
 748             mServerStatusText = R.string.auth_incorrect_address_title;
 749             break;
 750         case SSL_ERROR:
 751             mServerStatusText = R.string.auth_ssl_general_error_title;
 752             break;
 753         case UNAUTHORIZED:
 754             mServerStatusText = R.string.auth_unauthorized;
 755             break;
 756         case HOST_NOT_AVAILABLE:
 757             mServerStatusText = R.string.auth_unknown_host_title;
 758             break;
 759         case INSTANCE_NOT_CONFIGURED:
 760             mServerStatusText = R.string.auth_not_configured_title;
 761             break;
 762         case FILE_NOT_FOUND:
 763             mServerStatusText = R.string.auth_incorrect_path_title;
 764             break;
 765         case OAUTH2_ERROR:
 766             mServerStatusText = R.string.auth_oauth_error;
 767             break;
 768         case OAUTH2_ERROR_ACCESS_DENIED:
 769             mServerStatusText = R.string.auth_oauth_error_access_denied;
 770             break;
 771         case UNHANDLED_HTTP_CODE:
 772         case UNKNOWN_ERROR:
 773             mServerStatusText = R.string.auth_unknown_error_title;
 774             break;
 775         default:
 776             mServerStatusText = 0;
 777             mServerStatusIcon = 0;
 778         }
 779     }
 780
 781
 782     /**
 783      * Chooses the right icon and text to show to the user for the received operation result.
 784      *
 785      * @param result    Result of a remote operation performed in this activity
 786      */
 787     private void updateAuthStatusIconAndText(RemoteOperationResult result) {
 788         mAuthStatusIcon = R.drawable.common_error;    // the most common case in the switch below
 789
 790         switch (result.getCode()) {
 791         case OK_SSL:
 792             mAuthStatusIcon = android.R.drawable.ic_secure;
 793             mAuthStatusText = R.string.auth_secure_connection;
 794             break;
 795
 796         case OK_NO_SSL:
 797         case OK:
 798             if (mHostUrlInput.getText().toString().trim().toLowerCase().startsWith("http://") ) {
 799                 mAuthStatusText = R.string.auth_connection_established;
 800                 mAuthStatusIcon = R.drawable.ic_ok;
 801             } else {
 802                 mAuthStatusText = R.string.auth_nossl_plain_ok_title;
 803                 mAuthStatusIcon = android.R.drawable.ic_partial_secure;
 804             }
 805             break;
 806
 807         case NO_NETWORK_CONNECTION:
 808             mAuthStatusIcon = R.drawable.no_network;
 809             mAuthStatusText = R.string.auth_no_net_conn_title;
 810             break;
 811
 812         case SSL_RECOVERABLE_PEER_UNVERIFIED:
 813             mAuthStatusText = R.string.auth_ssl_unverified_server_title;
 814             break;
 815         case BAD_OC_VERSION:
 816             mAuthStatusText = R.string.auth_bad_oc_version_title;
 817             break;
 818         case WRONG_CONNECTION:
 819             mAuthStatusText = R.string.auth_wrong_connection_title;
 820             break;
 821         case TIMEOUT:
 822             mAuthStatusText = R.string.auth_timeout_title;
 823             break;
 824         case INCORRECT_ADDRESS:
 825             mAuthStatusText = R.string.auth_incorrect_address_title;
 826             break;
 827         case SSL_ERROR:
 828             mAuthStatusText = R.string.auth_ssl_general_error_title;
 829             break;
 830         case UNAUTHORIZED:
 831             mAuthStatusText = R.string.auth_unauthorized;
 832             break;
 833         case HOST_NOT_AVAILABLE:
 834             mAuthStatusText = R.string.auth_unknown_host_title;
 835             break;
 836         case INSTANCE_NOT_CONFIGURED:
 837             mAuthStatusText = R.string.auth_not_configured_title;
 838             break;
 839         case FILE_NOT_FOUND:
 840             mAuthStatusText = R.string.auth_incorrect_path_title;
 841             break;
 842         case OAUTH2_ERROR:
 843             mAuthStatusText = R.string.auth_oauth_error;
 844             break;
 845         case OAUTH2_ERROR_ACCESS_DENIED:
 846             mAuthStatusText = R.string.auth_oauth_error_access_denied;
 847             break;
 848         case UNHANDLED_HTTP_CODE:
 849         case UNKNOWN_ERROR:
 850             mAuthStatusText = R.string.auth_unknown_error_title;
 851             break;
 852         default:
 853             mAuthStatusText = 0;
 854             mAuthStatusIcon = 0;
 855         }
 856     }
 857
 858
 859     /**
 860      * Processes the result of the request for and access token send
 861      * to an OAuth authorization server.
 862      *
 863      * @param operation     Operation performed requesting the access token.
 864      * @param result        Result of the operation.
 865      */
 866     private void onGetOAuthAccessTokenFinish(OAuth2GetAccessToken operation, RemoteOperationResult result) {
 867         try {
 868             dismissDialog(DIALOG_OAUTH2_LOGIN_PROGRESS);
 869         } catch (IllegalArgumentException e) {
 870             // NOTHING TO DO ; can't find out what situation that leads to the exception in this code, but user logs signal that it happens
 871         }
 872
 873         String webdav_path = AccountUtils.getWebdavPath(mDiscoveredVersion, true);
 874         if (result.isSuccess() && webdav_path != null) {
 875             /// be gentle with the user
 876             showDialog(DIALOG_LOGIN_PROGRESS);
 877
 878             /// time to test the retrieved access token on the ownCloud server
 879             mOAuthAccessToken = ((OAuth2GetAccessToken)operation).getResultTokenMap().get(OAuth2Constants.KEY_ACCESS_TOKEN);
 880             Log_OC.d(TAG, "Got ACCESS TOKEN: " + mOAuthAccessToken);
 881             mAuthCheckOperation = new ExistenceCheckOperation("", this, false);
 882             WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(mHostBaseUrl + webdav_path), this);
 883             client.setBearerCredentials(mOAuthAccessToken);
 884             mAuthCheckOperation.execute(client, this, mHandler);
 885
 886         } else {
 887             updateAuthStatusIconAndText(result);
 888             showAuthStatus();
 889             Log_OC.d(TAG, "Access failed: " + result.getLogMessage());
 890         }
 891     }
 892
 893
 894     /**
 895      * Processes the result of the access check performed to try the user credentials.
 896      *
 897      * Creates a new account through the AccountManager.
 898      *
 899      * @param operation     Access check performed.
 900      * @param result        Result of the operation.
 901      */
 902     private void onAuthorizationCheckFinish(ExistenceCheckOperation operation, RemoteOperationResult result) {
 903         try {
 904             dismissDialog(DIALOG_LOGIN_PROGRESS);
 905         } catch (IllegalArgumentException e) {
 906             // NOTHING TO DO ; can't find out what situation that leads to the exception in this code, but user logs signal that it happens
 907         }
 908
 909         if (result.isSuccess()) {
 910             Log_OC.d(TAG, "Successful access - time to save the account");
 911
 912             if (mAction == ACTION_CREATE) {
 913                 createAccount();
 914
 915             } else {
 916                 updateToken();
 917             }
 918
 919             finish();
 920
 921         } else {
 922             updateAuthStatusIconAndText(result);
 923             showAuthStatus();
 924             Log_OC.d(TAG, "Access failed: " + result.getLogMessage());
 925         }
 926     }
 927
 928
 929     /**
 930      * Sets the proper response to get that the Account Authenticator that started this activity saves
 931      * a new authorization token for mAccount.
 932      */
 933     private void updateToken() {
 934         Bundle response = new Bundle();
 935         response.putString(AccountManager.KEY_ACCOUNT_NAME, mAccount.name);
 936         response.putString(AccountManager.KEY_ACCOUNT_TYPE, mAccount.type);
 937         boolean isOAuth = mOAuth2Check.isChecked();
 938         if (isOAuth) {
 939             response.putString(AccountManager.KEY_AUTHTOKEN, mOAuthAccessToken);
 940             // the next line is necessary; by now, notifications are calling directly to the AuthenticatorActivity to update, without AccountManager intervention
 941             mAccountMgr.setAuthToken(mAccount, AccountAuthenticator.AUTH_TOKEN_TYPE_ACCESS_TOKEN, mOAuthAccessToken);
 942         } else {
 943             response.putString(AccountManager.KEY_AUTHTOKEN, mPasswordInput.getText().toString());
 944             mAccountMgr.setPassword(mAccount, mPasswordInput.getText().toString());
 945         }
 946         setAccountAuthenticatorResult(response);
 947     }
 948
 949
 950     /**
 951      * Creates a new account through the Account Authenticator that started this activity.
 952      *
 953      * This makes the account permanent.
 954      *
 955      * TODO Decide how to name the OAuth accounts
 956      */
 957     private void createAccount() {
 958         /// create and save new ownCloud account
 959         boolean isOAuth = mOAuth2Check.isChecked();
 960
 961         Uri uri = Uri.parse(mHostBaseUrl);
 962         String username = mUsernameInput.getText().toString().trim();
 963         if (isOAuth) {
 964             username = "OAuth_user" + (new java.util.Random(System.currentTimeMillis())).nextLong();
 965         }
 966         String accountName = username + "@" + uri.getHost();
 967         if (uri.getPort() >= 0) {
 968             accountName += ":" + uri.getPort();
 969         }
 970         mAccount = new Account(accountName, AccountAuthenticator.ACCOUNT_TYPE);
 971         if (isOAuth) {
 972             mAccountMgr.addAccountExplicitly(mAccount, "", null);  // with our implementation, the password is never input in the app
 973         } else {
 974             mAccountMgr.addAccountExplicitly(mAccount, mPasswordInput.getText().toString(), null);
 975         }
 976
 977         /// add the new account as default in preferences, if there is none already
 978         Account defaultAccount = AccountUtils.getCurrentOwnCloudAccount(this);
 979         if (defaultAccount == null) {
 980             SharedPreferences.Editor editor = PreferenceManager
 981                     .getDefaultSharedPreferences(this).edit();
 982             editor.putString("select_oc_account", accountName);
 983             editor.commit();
 984         }
 985
 986         /// prepare result to return to the Authenticator
 987         //  TODO check again what the Authenticator makes with it; probably has the same effect as addAccountExplicitly, but it's not well done
 988         final Intent intent = new Intent();
 989         intent.putExtra(AccountManager.KEY_ACCOUNT_TYPE,    AccountAuthenticator.ACCOUNT_TYPE);
 990         intent.putExtra(AccountManager.KEY_ACCOUNT_NAME,    mAccount.name);
 991         if (!isOAuth)
 992             intent.putExtra(AccountManager.KEY_AUTHTOKEN,   AccountAuthenticator.ACCOUNT_TYPE); // TODO check this; not sure it's right; maybe
 993         intent.putExtra(AccountManager.KEY_USERDATA,        username);
 994         if (isOAuth) {
 995             mAccountMgr.setAuthToken(mAccount, AccountAuthenticator.AUTH_TOKEN_TYPE_ACCESS_TOKEN, mOAuthAccessToken);
 996         }
 997         /// add user data to the new account; TODO probably can be done in the last parameter addAccountExplicitly, or in KEY_USERDATA
 998         mAccountMgr.setUserData(mAccount, AccountAuthenticator.KEY_OC_VERSION,    mDiscoveredVersion.toString());
 999         mAccountMgr.setUserData(mAccount, AccountAuthenticator.KEY_OC_BASE_URL,   mHostBaseUrl);
1000         if (isOAuth)
1001             mAccountMgr.setUserData(mAccount, AccountAuthenticator.KEY_SUPPORTS_OAUTH2, "TRUE");  // TODO this flag should be unnecessary
1002
1003         setAccountAuthenticatorResult(intent.getExtras());
1004         setResult(RESULT_OK, intent);
1005
1006         /// immediately request for the synchronization of the new account
1007         Bundle bundle = new Bundle();
1008         bundle.putBoolean(ContentResolver.SYNC_EXTRAS_MANUAL, true);
1009         ContentResolver.requestSync(mAccount, AccountAuthenticator.AUTHORITY, bundle);
1010     }
1011
1012
1013     /**
1014      * {@inheritDoc}
1015      *
1016      * Necessary to update the contents of the SSL Dialog
1017      *
1018      * TODO move to some common place for all possible untrusted SSL failures
1019      */
1020     @Override
1021     protected void onPrepareDialog(int id, Dialog dialog, Bundle args) {
1022         switch (id) {
1023         case DIALOG_LOGIN_PROGRESS:
1024         case DIALOG_CERT_NOT_SAVED:
1025         case DIALOG_OAUTH2_LOGIN_PROGRESS:
1026             break;
1027         case DIALOG_SSL_VALIDATOR: {
1028             ((SslValidatorDialog)dialog).updateResult(mLastSslUntrustedServerResult);
1029             break;
1030         }
1031         default:
1032             Log_OC.e(TAG, "Incorrect dialog called with id = " + id);
1033         }
1034     }
1035
1036
1037     /**
1038      * {@inheritDoc}
1039      */
1040     @Override
1041     protected Dialog onCreateDialog(int id) {
1042         Dialog dialog = null;
1043         switch (id) {
1044         case DIALOG_LOGIN_PROGRESS: {
1045             /// simple progress dialog
1046             ProgressDialog working_dialog = new ProgressDialog(this);
1047             working_dialog.setMessage(getResources().getString(R.string.auth_trying_to_login));
1048             working_dialog.setIndeterminate(true);
1049             working_dialog.setCancelable(true);
1050             working_dialog
1051             .setOnCancelListener(new DialogInterface.OnCancelListener() {
1052                 @Override
1053                 public void onCancel(DialogInterface dialog) {
1054                     /// TODO study if this is enough
1055                     Log_OC.i(TAG, "Login canceled");
1056                     if (mOperationThread != null) {
1057                         mOperationThread.interrupt();
1058                         finish();
1059                     }
1060                 }
1061             });
1062             dialog = working_dialog;
1063             break;
1064         }
1065         case DIALOG_OAUTH2_LOGIN_PROGRESS: {
1066             ProgressDialog working_dialog = new ProgressDialog(this);
1067             working_dialog.setMessage(String.format("Getting authorization"));
1068             working_dialog.setIndeterminate(true);
1069             working_dialog.setCancelable(true);
1070             working_dialog
1071             .setOnCancelListener(new DialogInterface.OnCancelListener() {
1072                 @Override
1073                 public void onCancel(DialogInterface dialog) {
1074                     Log_OC.i(TAG, "Login canceled");
1075                     finish();
1076                 }
1077             });
1078             dialog = working_dialog;
1079             break;
1080         }
1081         case DIALOG_SSL_VALIDATOR: {
1082             /// TODO start to use new dialog interface, at least for this (it is a FragmentDialog already)
1083             dialog = SslValidatorDialog.newInstance(this, mLastSslUntrustedServerResult, this);
1084             break;
1085         }
1086         case DIALOG_CERT_NOT_SAVED: {
1087             AlertDialog.Builder builder = new AlertDialog.Builder(this);
1088             builder.setMessage(getResources().getString(R.string.ssl_validator_not_saved));
1089             builder.setCancelable(false);
1090             builder.setPositiveButton(R.string.common_ok, new DialogInterface.OnClickListener() {
1091                 @Override
1092                 public void onClick(DialogInterface dialog, int which) {
1093                     dialog.dismiss();
1094                 };
1095             });
1096             dialog = builder.create();
1097             break;
1098         }
1099         default:
1100             Log_OC.e(TAG, "Incorrect dialog called with id = " + id);
1101         }
1102         return dialog;
1103     }
1104
1105
1106     /**
1107      * Starts and activity to open the 'new account' page in the ownCloud web site
1108      *
1109      * @param view      'Account register' button
1110      */
1111     public void onRegisterClick(View view) {
1112         Intent register = new Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.url_account_register)));
1113         setResult(RESULT_CANCELED);
1114         startActivity(register);
1115     }
1116
1117
1118     /**
1119      * Updates the content and visibility state of the icon and text associated
1120      * to the last check on the ownCloud server.
1121      */
1122     private void showServerStatus() {
1123         TextView tv = (TextView) findViewById(R.id.server_status_text);
1124
1125         if (mServerStatusIcon == 0 && mServerStatusText == 0) {
1126             tv.setVisibility(View.INVISIBLE);
1127
1128         } else {
1129             tv.setText(mServerStatusText);
1130             tv.setCompoundDrawablesWithIntrinsicBounds(mServerStatusIcon, 0, 0, 0);
1131             tv.setVisibility(View.VISIBLE);
1132         }
1133
1134     }
1135
1136
1137     /**
1138      * Updates the content and visibility state of the icon and text associated
1139      * to the interactions with the OAuth authorization server.
1140      */
1141     private void showAuthStatus() {
1142         if (mAuthStatusIcon == 0 && mAuthStatusText == 0) {
1143             mAuthStatusLayout.setVisibility(View.INVISIBLE);
1144
1145         } else {
1146             mAuthStatusLayout.setText(mAuthStatusText);
1147             mAuthStatusLayout.setCompoundDrawablesWithIntrinsicBounds(mAuthStatusIcon, 0, 0, 0);
1148             mAuthStatusLayout.setVisibility(View.VISIBLE);
1149         }
1150     }
1151
1152
1153     private void showRefreshButton() {
1154         mHostUrlInput.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_action_refresh_black, 0);
1155         mRefreshButtonEnabled = true;
1156     }
1157
1158     private void hideRefreshButton() {
1159         mHostUrlInput.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
1160         mRefreshButtonEnabled = false;
1161     }
1162
1163     /**
1164      * Called when the refresh button in the input field for ownCloud host is clicked.
1165      *
1166      * Performs a new check on the URL in the input field.
1167      *
1168      * @param view      Refresh 'button'
1169      */
1170     public void onRefreshClick() {
1171         checkOcServer();
1172     }
1173
1174
1175     /**
1176      * Called when the eye icon in the password field is clicked.
1177      *
1178      * Toggles the visibility of the password in the field.
1179      */
1180     public void onViewPasswordClick() {
1181         int selectionStart = mPasswordInput.getSelectionStart();
1182         int selectionEnd = mPasswordInput.getSelectionEnd();
1183         if (isPasswordVisible()) {
1184             hidePassword();
1185         } else {
1186             showPassword();
1187         }
1188         mPasswordInput.setSelection(selectionStart, selectionEnd);
1189     }
1190
1191
1192     /**
1193      * Called when the checkbox for OAuth authorization is clicked.
1194      *
1195      * Hides or shows the input fields for user & password.
1196      *
1197      * @param view      'View password' 'button'
1198      */
1199     public void onCheckClick(View view) {
1200         CheckBox oAuth2Check = (CheckBox)view;
1201         changeViewByOAuth2Check(oAuth2Check.isChecked());
1202
1203     }
1204
1205     /**
1206      * Changes the visibility of input elements depending upon the kind of authorization
1207      * chosen by the user: basic or OAuth
1208      *
1209      * @param checked       'True' when OAuth is selected.
1210      */
1211     public void changeViewByOAuth2Check(Boolean checked) {
1212
1213         if (checked) {
1214             mOAuthAuthEndpointText.setVisibility(View.VISIBLE);
1215             mOAuthTokenEndpointText.setVisibility(View.VISIBLE);
1216             mUsernameInput.setVisibility(View.GONE);
1217             mPasswordInput.setVisibility(View.GONE);
1218         } else {
1219             mOAuthAuthEndpointText.setVisibility(View.GONE);
1220             mOAuthTokenEndpointText.setVisibility(View.GONE);
1221             mUsernameInput.setVisibility(View.VISIBLE);
1222             mPasswordInput.setVisibility(View.VISIBLE);
1223         }
1224
1225     }
1226
1227     /**
1228      * Called from SslValidatorDialog when a new server certificate was correctly saved.
1229      */
1230     public void onSavedCertificate() {
1231         mOperationThread = mOcServerChkOperation.retry(this, mHandler);
1232     }
1233
1234     /**
1235      * Called from SslValidatorDialog when a new server certificate could not be saved
1236      * when the user requested it.
1237      */
1238     @Override
1239     public void onFailedSavingCertificate() {
1240         showDialog(DIALOG_CERT_NOT_SAVED);
1241     }
1242
1243
1244     /**
1245      *  Called when the 'action' button in an IME is pressed ('enter' in software keyboard).
1246      *
1247      *  Used to trigger the authorization check when the user presses 'enter' after writing the password.
1248      */
1249     @Override
1250     public boolean onEditorAction(TextView inputField, int actionId, KeyEvent event) {
1251         if (inputField != null && inputField.equals(mPasswordInput) &&
1252                 actionId == EditorInfo.IME_ACTION_DONE) {
1253             if (mOkButton.isEnabled()) {
1254                 mOkButton.performClick();
1255             }
1256         }
1257         return false;   // always return false to grant that the software keyboard is hidden anyway
1258     }
1259
1260
1261     private abstract static class RightDrawableOnTouchListener implements OnTouchListener  {
1262
1263         private int fuzz = 75;
1264
1265         /**
1266          * {@inheritDoc}
1267          */
1268         @Override
1269         public boolean onTouch(View view, MotionEvent event) {
1270             Drawable rightDrawable = null;
1271             if (view instanceof TextView) {
1272                 Drawable[] drawables = ((TextView)view).getCompoundDrawables();
1273                 if (drawables.length > 2) {
1274                     rightDrawable = drawables[2];
1275                 }
1276             }
1277             if (rightDrawable != null) {
1278                 final int x = (int) event.getX();
1279                 final int y = (int) event.getY();
1280                 final Rect bounds = rightDrawable.getBounds();
1281                 if (x >= (view.getRight() - bounds.width() - fuzz) && x <= (view.getRight() - view.getPaddingRight() + fuzz)
1282                     && y >= (view.getPaddingTop() - fuzz) && y <= (view.getHeight() - view.getPaddingBottom()) + fuzz) {
1283
1284                     return onDrawableTouch(event);
1285                 }
1286             }
1287             return false;
1288         }
1289
1290         public abstract boolean onDrawableTouch(final MotionEvent event);
1291     }
1292
1293 }