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

   1 /* ownCloud Android client application
   2  *   Copyright (C) 2012  Bartek Przybylski
   3  *   Copyright (C) 2012-2013 ownCloud Inc.
   4  *
   5  *   This program is free software: you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License version 2,
   7  *   as published by the Free Software Foundation.
   8  *
   9  *   This program is distributed in the hope that it will be useful,
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *   GNU General Public License for more details.
  13  *
  14  *   You should have received a copy of the GNU General Public License
  15  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  *
  17  */
  18
  19 package com.owncloud.android.authentication;
  20
  21 import com.owncloud.android.AccountUtils;
  22 import com.owncloud.android.Log_OC;
  23 import com.owncloud.android.ui.dialog.SslValidatorDialog;
  24 import com.owncloud.android.ui.dialog.SslValidatorDialog.OnSslValidatorListener;
  25 import com.owncloud.android.utils.OwnCloudVersion;
  26 import com.owncloud.android.network.OwnCloudClientUtils;
  27 import com.owncloud.android.operations.OwnCloudServerCheckOperation;
  28 import com.owncloud.android.operations.ExistenceCheckOperation;
  29 import com.owncloud.android.operations.OAuth2GetAccessToken;
  30 import com.owncloud.android.operations.OnRemoteOperationListener;
  31 import com.owncloud.android.operations.RemoteOperation;
  32 import com.owncloud.android.operations.RemoteOperationResult;
  33 import com.owncloud.android.operations.RemoteOperationResult.ResultCode;
  34
  35 import android.accounts.Account;
  36 import android.accounts.AccountAuthenticatorActivity;
  37 import android.accounts.AccountManager;
  38 import android.app.AlertDialog;
  39 import android.app.Dialog;
  40 import android.app.ProgressDialog;
  41 import android.content.ContentResolver;
  42 import android.content.DialogInterface;
  43 import android.content.Intent;
  44 import android.content.SharedPreferences;
  45 import android.graphics.Rect;
  46 import android.graphics.drawable.Drawable;
  47 import android.net.Uri;
  48 import android.os.Bundle;
  49 import android.os.Handler;
  50 import android.preference.PreferenceManager;
  51 import android.text.Editable;
  52 import android.text.InputType;
  53 import android.text.TextWatcher;
  54 import android.view.KeyEvent;
  55 import android.view.MotionEvent;
  56 import android.view.View;
  57 import android.view.View.OnFocusChangeListener;
  58 import android.view.View.OnTouchListener;
  59 import android.view.Window;
  60 import android.view.inputmethod.EditorInfo;
  61 import android.widget.CheckBox;
  62 import android.widget.EditText;
  63 import android.widget.Button;
  64 import android.widget.ImageView;
  65 import android.widget.TextView;
  66 import android.widget.Toast;
  67 import android.widget.TextView.OnEditorActionListener;
  68
  69 import com.owncloud.android.R;
  70
  71 import eu.alefzero.webdav.WebdavClient;
  72
  73 /**
  74  * This Activity is used to add an ownCloud account to the App
  75  *
  76  * @author Bartek Przybylski
  77  * @author David A. Velasco
  78  */
  79 public class AuthenticatorActivity extends AccountAuthenticatorActivity
  80 implements  OnRemoteOperationListener, OnSslValidatorListener, OnFocusChangeListener, OnEditorActionListener {
  81
  82     private static final String TAG = AuthenticatorActivity.class.getSimpleName();
  83
  84     public static final String EXTRA_ACCOUNT = "ACCOUNT";
  85     public static final String EXTRA_USER_NAME = "USER_NAME";
  86     public static final String EXTRA_HOST_NAME = "HOST_NAME";
  87     public static final String EXTRA_ACTION = "ACTION";
  88
  89     private static final String KEY_HOST_URL_TEXT = "HOST_URL_TEXT";
  90     private static final String KEY_OC_VERSION = "OC_VERSION";
  91     private static final String KEY_ACCOUNT = "ACCOUNT";
  92     private static final String KEY_SERVER_VALID = "SERVER_VALID";
  93     private static final String KEY_SERVER_CHECKED = "SERVER_CHECKED";
  94     private static final String KEY_SERVER_CHECK_IN_PROGRESS = "SERVER_CHECK_IN_PROGRESS";
  95     private static final String KEY_SERVER_STATUS_TEXT = "SERVER_STATUS_TEXT";
  96     private static final String KEY_SERVER_STATUS_ICON = "SERVER_STATUS_ICON";
  97     private static final String KEY_IS_SSL_CONN = "IS_SSL_CONN";
  98     private static final String KEY_AUTH_STATUS_TEXT = "AUTH_STATUS_TEXT";
  99     private static final String KEY_AUTH_STATUS_ICON = "AUTH_STATUS_ICON";
 100     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 ImageView mViewPasswordButton;
 136     private EditText mHostUrlInput;
 137     private EditText mUsernameInput;
 138     private EditText mPasswordInput;
 139     private CheckBox mOAuth2Check;
 140     private String mOAuthAccessToken;
 141     private View mOkButton;
 142     private TextView mAuthStatusLayout;
 143
 144     private TextView mOAuthAuthEndpointText;
 145     private TextView mOAuthTokenEndpointText;
 146
 147     private boolean mRefreshButtonEnabled;
 148
 149
 150     /**
 151      * {@inheritDoc}
 152      *
 153      * IMPORTANT ENTRY POINT 1: activity is shown to the user
 154      */
 155     @Override
 156     protected void onCreate(Bundle savedInstanceState) {
 157         super.onCreate(savedInstanceState);
 158         getWindow().requestFeature(Window.FEATURE_NO_TITLE);
 159
 160         /// set view and get references to view elements
 161         setContentView(R.layout.account_setup);
 162         mViewPasswordButton = (ImageView) findViewById(R.id.viewPasswordButton);
 163         mHostUrlInput = (EditText) findViewById(R.id.hostUrlInput);
 164         mUsernameInput = (EditText) findViewById(R.id.account_username);
 165         mPasswordInput = (EditText) findViewById(R.id.account_password);
 166         mOAuthAuthEndpointText = (TextView)findViewById(R.id.oAuthEntryPoint_1);
 167         mOAuthTokenEndpointText = (TextView)findViewById(R.id.oAuthEntryPoint_2);
 168         mOAuth2Check = (CheckBox) findViewById(R.id.oauth_onOff_check);
 169         mOkButton = findViewById(R.id.buttonOK);
 170         mAuthStatusLayout = (TextView) findViewById(R.id.auth_status_text);
 171
 172         /// complete label for 'register account' button
 173         Button b = (Button) findViewById(R.id.account_register);
 174         if (b != null) {
 175             b.setText(String.format(getString(R.string.auth_register), getString(R.string.app_name)));
 176         }
 177
 178         /// initialization
 179         mAccountMgr = AccountManager.get(this);
 180         mNewCapturedUriFromOAuth2Redirection = null;
 181         mAction = getIntent().getByteExtra(EXTRA_ACTION, ACTION_CREATE);
 182         mAccount = null;
 183         mHostBaseUrl = "";
 184
 185         if (savedInstanceState == null) {
 186             /// connection state and info
 187             mServerStatusText = mServerStatusIcon = 0;
 188             mServerIsValid = false;
 189             mServerIsChecked = false;
 190             mIsSslConn = false;
 191             mAuthStatusText = mAuthStatusIcon = 0;
 192
 193             /// retrieve extras from intent
 194             String tokenType = getIntent().getExtras().getString(AccountAuthenticator.KEY_AUTH_TOKEN_TYPE);
 195             boolean oAuthRequired = AccountAuthenticator.AUTH_TOKEN_TYPE_ACCESS_TOKEN.equals(tokenType) || OAUTH_MODE_ON.equals(getString(R.string.oauth2_mode));
 196
 197             mAccount = getIntent().getExtras().getParcelable(EXTRA_ACCOUNT);
 198             if (mAccount != null) {
 199                 String ocVersion = mAccountMgr.getUserData(mAccount, AccountAuthenticator.KEY_OC_VERSION);
 200                 if (ocVersion != null) {
 201                     mDiscoveredVersion = new OwnCloudVersion(ocVersion);
 202                 }
 203                 mHostBaseUrl = normalizeUrl(mAccountMgr.getUserData(mAccount, AccountAuthenticator.KEY_OC_BASE_URL));
 204                 mHostUrlInput.setText(mHostBaseUrl);
 205                 String userName = mAccount.name.substring(0, mAccount.name.lastIndexOf('@'));
 206                 mUsernameInput.setText(userName);
 207                 oAuthRequired = (mAccountMgr.getUserData(mAccount, AccountAuthenticator.KEY_SUPPORTS_OAUTH2) != null);
 208             }
 209             mOAuth2Check.setChecked(oAuthRequired);
 210             changeViewByOAuth2Check(oAuthRequired);
 211
 212
 213         } else {
 214             /// connection state and info
 215             mServerIsValid = savedInstanceState.getBoolean(KEY_SERVER_VALID);
 216             mServerIsChecked = savedInstanceState.getBoolean(KEY_SERVER_CHECKED);
 217             mServerStatusText = savedInstanceState.getInt(KEY_SERVER_STATUS_TEXT);
 218             mServerStatusIcon = savedInstanceState.getInt(KEY_SERVER_STATUS_ICON);
 219             mIsSslConn = savedInstanceState.getBoolean(KEY_IS_SSL_CONN);
 220             mAuthStatusText = savedInstanceState.getInt(KEY_AUTH_STATUS_TEXT);
 221             mAuthStatusIcon = savedInstanceState.getInt(KEY_AUTH_STATUS_ICON);
 222
 223             /// server data
 224             String ocVersion = savedInstanceState.getString(KEY_OC_VERSION);
 225             if (ocVersion != null) {
 226                 mDiscoveredVersion = new OwnCloudVersion(ocVersion);
 227             }
 228             mHostBaseUrl = savedInstanceState.getString(KEY_HOST_URL_TEXT);
 229
 230             // account data, if updating
 231             mAccount = savedInstanceState.getParcelable(KEY_ACCOUNT);
 232
 233             // check if server check was interrupted by a configuration change
 234             if (savedInstanceState.getBoolean(KEY_SERVER_CHECK_IN_PROGRESS, false)) {
 235                 checkOcServer();
 236             }
 237
 238             // refresh button enabled
 239             mRefreshButtonEnabled = savedInstanceState.getBoolean(KEY_REFRESH_BUTTON_ENABLED);
 240
 241         }
 242
 243         showServerStatus();
 244         showAuthStatus();
 245         if (mServerIsChecked && !mServerIsValid && mRefreshButtonEnabled) showRefreshButton();
 246         mOkButton.setEnabled(mServerIsValid); // state not automatically recovered in configuration changes
 247
 248         if (!OAUTH_MODE_OPTIONAL.equals(getString(R.string.oauth2_mode))) {
 249             mOAuth2Check.setVisibility(View.GONE);
 250         }
 251
 252         if (mAction == ACTION_UPDATE_TOKEN) {
 253             /// lock things that should not change
 254             mHostUrlInput.setEnabled(false);
 255             mUsernameInput.setEnabled(false);
 256             mOAuth2Check.setVisibility(View.GONE);
 257             if (!mServerIsValid && mOcServerChkOperation == null) {
 258                 checkOcServer();
 259             }
 260         }
 261
 262         mPasswordInput.setText("");     // clean password to avoid social hacking (disadvantage: password in removed if the device is turned aside)
 263         mJustCreated = true;
 264
 265         /// bind view elements to listeners
 266         mHostUrlInput.setOnFocusChangeListener(this);
 267         mHostUrlInput.setOnTouchListener(new RightDrawableOnTouchListener() {
 268             @Override
 269             public boolean onDrawableTouch(final MotionEvent event) {
 270                 AuthenticatorActivity.this.onRefreshClick(mHostUrlInput);
 271                 return true;
 272             }
 273         });
 274         mHostUrlInput.addTextChangedListener(new TextWatcher() {
 275
 276             @Override
 277             public void afterTextChanged(Editable s) {
 278                 if (!mHostBaseUrl.equals(normalizeUrl(mHostUrlInput.getText().toString()))) {
 279                     mOkButton.setEnabled(false);
 280                 }
 281             }
 282
 283             @Override
 284             public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
 285
 286             @Override
 287             public void onTextChanged(CharSequence s, int start, int before, int count) {}
 288
 289         });
 290         mPasswordInput.setOnFocusChangeListener(this);
 291         mPasswordInput.setImeOptions(EditorInfo.IME_ACTION_DONE);
 292         mPasswordInput.setOnEditorActionListener(this);
 293
 294     }
 295
 296     /**
 297      * Saves relevant state before {@link #onPause()}
 298      *
 299      * Do NOT save {@link #mNewCapturedUriFromOAuth2Redirection}; it keeps a temporal flag, intended to defer the
 300      * processing of the redirection caught in {@link #onNewIntent(Intent)} until {@link #onResume()}
 301      *
 302      * See {@link #loadSavedInstanceState(Bundle)}
 303      */
 304     @Override
 305     protected void onSaveInstanceState(Bundle outState) {
 306         super.onSaveInstanceState(outState);
 307
 308         /// connection state and info
 309         outState.putInt(KEY_SERVER_STATUS_TEXT, mServerStatusText);
 310         outState.putInt(KEY_SERVER_STATUS_ICON, mServerStatusIcon);
 311         outState.putBoolean(KEY_SERVER_VALID, mServerIsValid);
 312         outState.putBoolean(KEY_SERVER_CHECKED, mServerIsChecked);
 313         outState.putBoolean(KEY_SERVER_CHECK_IN_PROGRESS, (!mServerIsValid && mOcServerChkOperation != null));
 314         outState.putBoolean(KEY_IS_SSL_CONN, mIsSslConn);
 315         outState.putInt(KEY_AUTH_STATUS_ICON, mAuthStatusIcon);
 316         outState.putInt(KEY_AUTH_STATUS_TEXT, mAuthStatusText);
 317
 318         /// server data
 319         if (mDiscoveredVersion != null) {
 320             outState.putString(KEY_OC_VERSION, mDiscoveredVersion.toString());
 321         }
 322         outState.putString(KEY_HOST_URL_TEXT, mHostBaseUrl);
 323
 324         /// account data, if updating
 325         if (mAccount != null) {
 326             outState.putParcelable(KEY_ACCOUNT, mAccount);
 327         }
 328
 329         // refresh button enabled
 330         outState.putBoolean(KEY_REFRESH_BUTTON_ENABLED, mRefreshButtonEnabled);
 331
 332     }
 333
 334
 335     /**
 336      * The redirection triggered by the OAuth authentication server as response to the GET AUTHORIZATION request
 337      * is caught here.
 338      *
 339      * To make this possible, this activity needs to be qualified with android:launchMode = "singleTask" in the
 340      * AndroidManifest.xml file.
 341      */
 342     @Override
 343     protected void onNewIntent (Intent intent) {
 344         Log_OC.d(TAG, "onNewIntent()");
 345         Uri data = intent.getData();
 346         if (data != null && data.toString().startsWith(getString(R.string.oauth2_redirect_uri))) {
 347             mNewCapturedUriFromOAuth2Redirection = data;
 348         }
 349     }
 350
 351
 352     /**
 353      * The redirection triggered by the OAuth authentication server as response to the GET AUTHORIZATION, and
 354      * deferred in {@link #onNewIntent(Intent)}, is processed here.
 355      */
 356     @Override
 357     protected void onResume() {
 358         super.onResume();
 359         // the state of mOAuth2Check is automatically recovered between configuration changes, but not before onCreate() finishes; so keep the next lines here
 360         changeViewByOAuth2Check(mOAuth2Check.isChecked());
 361         if (mAction == ACTION_UPDATE_TOKEN && mJustCreated) {
 362             if (mOAuth2Check.isChecked())
 363                 Toast.makeText(this, R.string.auth_expired_oauth_token_toast, Toast.LENGTH_LONG).show();
 364             else
 365                 Toast.makeText(this, R.string.auth_expired_basic_auth_toast, Toast.LENGTH_LONG).show();
 366         }
 367
 368         if (mNewCapturedUriFromOAuth2Redirection != null) {
 369             getOAuth2AccessTokenFromCapturedRedirection();
 370         }
 371
 372         mJustCreated = false;
 373     }
 374
 375
 376     /**
 377      * Parses the redirection with the response to the GET AUTHORIZATION request to the
 378      * oAuth server and requests for the access token (GET ACCESS TOKEN)
 379      */
 380     private void getOAuth2AccessTokenFromCapturedRedirection() {
 381         /// Parse data from OAuth redirection
 382         String queryParameters = mNewCapturedUriFromOAuth2Redirection.getQuery();
 383         mNewCapturedUriFromOAuth2Redirection = null;
 384
 385         /// Showing the dialog with instructions for the user.
 386         showDialog(DIALOG_OAUTH2_LOGIN_PROGRESS);
 387
 388         /// GET ACCESS TOKEN to the oAuth server
 389         RemoteOperation operation = new OAuth2GetAccessToken(   getString(R.string.oauth2_client_id),
 390                 getString(R.string.oauth2_redirect_uri),
 391                 getString(R.string.oauth2_grant_type),
 392                 queryParameters);
 393         //WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(getString(R.string.oauth2_url_endpoint_access)), getApplicationContext());
 394         WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(mOAuthTokenEndpointText.getText().toString().trim()), getApplicationContext());
 395         operation.execute(client, this, mHandler);
 396     }
 397
 398
 399
 400     /**
 401      * Handles the change of focus on the text inputs for the server URL and the password
 402      */
 403     public void onFocusChange(View view, boolean hasFocus) {
 404         if (view.getId() == R.id.hostUrlInput) {
 405             if (!hasFocus) {
 406                 onUrlInputFocusLost((TextView) view);
 407                 if (!mServerIsValid) {
 408                     showRefreshButton();
 409                 }
 410             }
 411             else {
 412                 hideRefreshButton();
 413             }
 414
 415         } else if (view.getId() == R.id.account_password) {
 416             onPasswordFocusChanged((TextView) view, hasFocus);
 417         }
 418     }
 419
 420
 421     /**
 422      * Handles changes in focus on the text input for the server URL.
 423      *
 424      * IMPORTANT ENTRY POINT 2: When (!hasFocus), user wrote the server URL and changed to
 425      * other field. The operation to check the existence of the server in the entered URL is
 426      * started.
 427      *
 428      * When hasFocus:    user 'comes back' to write again the server URL.
 429      *
 430      * @param hostInput     TextView with the URL input field receiving the change of focus.
 431      */
 432     private void onUrlInputFocusLost(TextView hostInput) {
 433         if (!mHostBaseUrl.equals(normalizeUrl(mHostUrlInput.getText().toString()))) {
 434             checkOcServer();
 435         } else {
 436             mOkButton.setEnabled(mServerIsValid);
 437         }
 438     }
 439
 440
 441     private void checkOcServer() {
 442         String uri = mHostUrlInput.getText().toString().trim();
 443         mServerIsValid = false;
 444         mServerIsChecked = false;
 445         mOkButton.setEnabled(false);
 446         mDiscoveredVersion = null;
 447         hideRefreshButton();
 448         if (uri.length() != 0) {
 449             mServerStatusText = R.string.auth_testing_connection;
 450             mServerStatusIcon = R.drawable.progress_small;
 451             showServerStatus();
 452             mOcServerChkOperation = new  OwnCloudServerCheckOperation(uri, this);
 453             WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(uri), this);
 454             mOperationThread = mOcServerChkOperation.execute(client, this, mHandler);
 455         } else {
 456             mServerStatusText = 0;
 457             mServerStatusIcon = 0;
 458             showServerStatus();
 459         }
 460     }
 461
 462
 463     /**
 464      * Handles changes in focus on the text input for the password (basic authorization).
 465      *
 466      * When (hasFocus), the button to toggle password visibility is shown.
 467      *
 468      * When (!hasFocus), the button is made invisible and the password is hidden.
 469      *
 470      * @param passwordInput    TextView with the password input field receiving the change of focus.
 471      * @param hasFocus          'True' if focus is received, 'false' if is lost
 472      */
 473     private void onPasswordFocusChanged(TextView passwordInput, boolean hasFocus) {
 474         if (hasFocus) {
 475             mViewPasswordButton.setVisibility(View.VISIBLE);
 476         } else {
 477             int input_type = InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD;
 478             passwordInput.setInputType(input_type);
 479             mViewPasswordButton.setVisibility(View.INVISIBLE);
 480         }
 481     }
 482
 483
 484
 485     /**
 486      * Cancels the authenticator activity
 487      *
 488      * IMPORTANT ENTRY POINT 3: Never underestimate the importance of cancellation
 489      *
 490      * This method is bound in the layout/acceoun_setup.xml resource file.
 491      *
 492      * @param view      Cancel button
 493      */
 494     public void onCancelClick(View view) {
 495         setResult(RESULT_CANCELED);     // TODO review how is this related to AccountAuthenticator (debugging)
 496         finish();
 497     }
 498
 499
 500
 501     /**
 502      * Checks the credentials of the user in the root of the ownCloud server
 503      * before creating a new local account.
 504      *
 505      * For basic authorization, a check of existence of the root folder is
 506      * performed.
 507      *
 508      * For OAuth, starts the flow to get an access token; the credentials test
 509      * is postponed until it is available.
 510      *
 511      * IMPORTANT ENTRY POINT 4
 512      *
 513      * @param view      OK button
 514      */
 515     public void onOkClick(View view) {
 516         // this check should be unnecessary
 517         if (mDiscoveredVersion == null || !mDiscoveredVersion.isVersionValid()  || mHostBaseUrl == null || mHostBaseUrl.length() == 0) {
 518             mServerStatusIcon = R.drawable.common_error;
 519             mServerStatusText = R.string.auth_wtf_reenter_URL;
 520             showServerStatus();
 521             mOkButton.setEnabled(false);
 522             Log_OC.wtf(TAG,  "The user was allowed to click 'connect' to an unchecked server!!");
 523             return;
 524         }
 525
 526         if (mOAuth2Check.isChecked()) {
 527             startOauthorization();
 528
 529         } else {
 530             checkBasicAuthorization();
 531         }
 532     }
 533
 534
 535     /**
 536      * Tests the credentials entered by the user performing a check of existence on
 537      * the root folder of the ownCloud server.
 538      */
 539     private void checkBasicAuthorization() {
 540         /// get the path to the root folder through WebDAV from the version server
 541         String webdav_path = AccountUtils.getWebdavPath(mDiscoveredVersion, false);
 542
 543         /// get basic credentials entered by user
 544         String username = mUsernameInput.getText().toString();
 545         String password = mPasswordInput.getText().toString();
 546
 547         /// be gentle with the user
 548         showDialog(DIALOG_LOGIN_PROGRESS);
 549
 550         /// test credentials accessing the root folder
 551         mAuthCheckOperation = new  ExistenceCheckOperation("", this, false);
 552         WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(mHostBaseUrl + webdav_path), this);
 553         client.setBasicCredentials(username, password);
 554         mOperationThread = mAuthCheckOperation.execute(client, this, mHandler);
 555     }
 556
 557
 558     /**
 559      * Starts the OAuth 'grant type' flow to get an access token, with
 560      * a GET AUTHORIZATION request to the BUILT-IN authorization server.
 561      */
 562     private void startOauthorization() {
 563         // be gentle with the user
 564         mAuthStatusIcon = R.drawable.progress_small;
 565         mAuthStatusText = R.string.oauth_login_connection;
 566         showAuthStatus();
 567
 568         // GET AUTHORIZATION request
 569         //Uri uri = Uri.parse(getString(R.string.oauth2_url_endpoint_auth));
 570         Uri uri = Uri.parse(mOAuthAuthEndpointText.getText().toString().trim());
 571         Uri.Builder uriBuilder = uri.buildUpon();
 572         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_RESPONSE_TYPE, getString(R.string.oauth2_response_type));
 573         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_REDIRECT_URI, getString(R.string.oauth2_redirect_uri));
 574         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_CLIENT_ID, getString(R.string.oauth2_client_id));
 575         uriBuilder.appendQueryParameter(OAuth2Constants.KEY_SCOPE, getString(R.string.oauth2_scope));
 576         //uriBuilder.appendQueryParameter(OAuth2Constants.KEY_STATE, whateverwewant);
 577         uri = uriBuilder.build();
 578         Log_OC.d(TAG, "Starting browser to view " + uri.toString());
 579         Intent i = new Intent(Intent.ACTION_VIEW, uri);
 580         startActivity(i);
 581     }
 582
 583
 584     /**
 585      * Callback method invoked when a RemoteOperation executed by this Activity finishes.
 586      *
 587      * Dispatches the operation flow to the right method.
 588      */
 589     @Override
 590     public void onRemoteOperationFinish(RemoteOperation operation, RemoteOperationResult result) {
 591
 592         if (operation instanceof OwnCloudServerCheckOperation) {
 593             onOcServerCheckFinish((OwnCloudServerCheckOperation) operation, result);
 594
 595         } else if (operation instanceof OAuth2GetAccessToken) {
 596             onGetOAuthAccessTokenFinish((OAuth2GetAccessToken)operation, result);
 597
 598         } else if (operation instanceof ExistenceCheckOperation)  {
 599             onAuthorizationCheckFinish((ExistenceCheckOperation)operation, result);
 600
 601         }
 602     }
 603
 604
 605     /**
 606      * Processes the result of the server check performed when the user finishes the enter of the
 607      * server URL.
 608      *
 609      * @param operation     Server check performed.
 610      * @param result        Result of the check.
 611      */
 612     private void onOcServerCheckFinish(OwnCloudServerCheckOperation operation, RemoteOperationResult result) {
 613         if (operation.equals(mOcServerChkOperation)) {
 614             /// save result state
 615             mServerIsChecked = true;
 616             mServerIsValid = result.isSuccess();
 617             mIsSslConn = (result.getCode() == ResultCode.OK_SSL);
 618             mOcServerChkOperation = null;
 619
 620             /// update status icon and text
 621             if (mServerIsValid) {
 622                 hideRefreshButton();
 623             } else {
 624                 showRefreshButton();
 625             }
 626             updateServerStatusIconAndText(result);
 627             showServerStatus();
 628
 629             /// very special case (TODO: move to a common place for all the remote operations)
 630             if (result.getCode() == ResultCode.SSL_RECOVERABLE_PEER_UNVERIFIED) {
 631                 mLastSslUntrustedServerResult = result;
 632                 showDialog(DIALOG_SSL_VALIDATOR);
 633             }
 634
 635             /// retrieve discovered version and normalize server URL
 636             mDiscoveredVersion = operation.getDiscoveredVersion();
 637             mHostBaseUrl = normalizeUrl(mHostUrlInput.getText().toString());
 638
 639             /// allow or not the user try to access the server
 640             mOkButton.setEnabled(mServerIsValid);
 641
 642         }   // else nothing ; only the last check operation is considered;
 643         // multiple can be triggered if the user amends a URL before a previous check can be triggered
 644     }
 645
 646
 647     private String normalizeUrl(String url) {
 648         if (url != null && url.length() > 0) {
 649             url = url.trim();
 650             if (!url.toLowerCase().startsWith("http://") &&
 651                     !url.toLowerCase().startsWith("https://")) {
 652                 if (mIsSslConn) {
 653                     url = "https://" + url;
 654                 } else {
 655                     url = "http://" + url;
 656                 }
 657
 658             }
 659             if (url.endsWith("/")) {
 660                 url = url.substring(0, url.length() - 1);
 661             }
 662         }
 663         return (url != null ? url : "");
 664     }
 665
 666     /**
 667      * Chooses the right icon and text to show to the user for the received operation result.
 668      *
 669      * @param result    Result of a remote operation performed in this activity
 670      */
 671     private void updateServerStatusIconAndText(RemoteOperationResult result) {
 672         mServerStatusIcon = R.drawable.common_error;    // the most common case in the switch below
 673
 674         switch (result.getCode()) {
 675         case OK_SSL:
 676             mServerStatusIcon = android.R.drawable.ic_secure;
 677             mServerStatusText = R.string.auth_secure_connection;
 678             break;
 679
 680         case OK_NO_SSL:
 681         case OK:
 682             if (mHostUrlInput.getText().toString().trim().toLowerCase().startsWith("http://") ) {
 683                 mServerStatusText = R.string.auth_connection_established;
 684                 mServerStatusIcon = R.drawable.ic_ok;
 685             } else {
 686                 mServerStatusText = R.string.auth_nossl_plain_ok_title;
 687                 mServerStatusIcon = android.R.drawable.ic_partial_secure;
 688             }
 689             break;
 690
 691         case NO_NETWORK_CONNECTION:
 692             mServerStatusIcon = R.drawable.no_network;
 693             mServerStatusText = R.string.auth_no_net_conn_title;
 694             break;
 695
 696         case SSL_RECOVERABLE_PEER_UNVERIFIED:
 697             mServerStatusText = R.string.auth_ssl_unverified_server_title;
 698             break;
 699         case BAD_OC_VERSION:
 700             mServerStatusText = R.string.auth_bad_oc_version_title;
 701             break;
 702         case WRONG_CONNECTION:
 703             mServerStatusText = R.string.auth_wrong_connection_title;
 704             break;
 705         case TIMEOUT:
 706             mServerStatusText = R.string.auth_timeout_title;
 707             break;
 708         case INCORRECT_ADDRESS:
 709             mServerStatusText = R.string.auth_incorrect_address_title;
 710             break;
 711         case SSL_ERROR:
 712             mServerStatusText = R.string.auth_ssl_general_error_title;
 713             break;
 714         case UNAUTHORIZED:
 715             mServerStatusText = R.string.auth_unauthorized;
 716             break;
 717         case HOST_NOT_AVAILABLE:
 718             mServerStatusText = R.string.auth_unknown_host_title;
 719             break;
 720         case INSTANCE_NOT_CONFIGURED:
 721             mServerStatusText = R.string.auth_not_configured_title;
 722             break;
 723         case FILE_NOT_FOUND:
 724             mServerStatusText = R.string.auth_incorrect_path_title;
 725             break;
 726         case OAUTH2_ERROR:
 727             mServerStatusText = R.string.auth_oauth_error;
 728             break;
 729         case OAUTH2_ERROR_ACCESS_DENIED:
 730             mServerStatusText = R.string.auth_oauth_error_access_denied;
 731             break;
 732         case UNHANDLED_HTTP_CODE:
 733         case UNKNOWN_ERROR:
 734             mServerStatusText = R.string.auth_unknown_error_title;
 735             break;
 736         default:
 737             mServerStatusText = 0;
 738             mServerStatusIcon = 0;
 739         }
 740     }
 741
 742
 743     /**
 744      * Chooses the right icon and text to show to the user for the received operation result.
 745      *
 746      * @param result    Result of a remote operation performed in this activity
 747      */
 748     private void updateAuthStatusIconAndText(RemoteOperationResult result) {
 749         mAuthStatusIcon = R.drawable.common_error;    // the most common case in the switch below
 750
 751         switch (result.getCode()) {
 752         case OK_SSL:
 753             mAuthStatusIcon = android.R.drawable.ic_secure;
 754             mAuthStatusText = R.string.auth_secure_connection;
 755             break;
 756
 757         case OK_NO_SSL:
 758         case OK:
 759             if (mHostUrlInput.getText().toString().trim().toLowerCase().startsWith("http://") ) {
 760                 mAuthStatusText = R.string.auth_connection_established;
 761                 mAuthStatusIcon = R.drawable.ic_ok;
 762             } else {
 763                 mAuthStatusText = R.string.auth_nossl_plain_ok_title;
 764                 mAuthStatusIcon = android.R.drawable.ic_partial_secure;
 765             }
 766             break;
 767
 768         case NO_NETWORK_CONNECTION:
 769             mAuthStatusIcon = R.drawable.no_network;
 770             mAuthStatusText = R.string.auth_no_net_conn_title;
 771             break;
 772
 773         case SSL_RECOVERABLE_PEER_UNVERIFIED:
 774             mAuthStatusText = R.string.auth_ssl_unverified_server_title;
 775             break;
 776         case BAD_OC_VERSION:
 777             mAuthStatusText = R.string.auth_bad_oc_version_title;
 778             break;
 779         case WRONG_CONNECTION:
 780             mAuthStatusText = R.string.auth_wrong_connection_title;
 781             break;
 782         case TIMEOUT:
 783             mAuthStatusText = R.string.auth_timeout_title;
 784             break;
 785         case INCORRECT_ADDRESS:
 786             mAuthStatusText = R.string.auth_incorrect_address_title;
 787             break;
 788         case SSL_ERROR:
 789             mAuthStatusText = R.string.auth_ssl_general_error_title;
 790             break;
 791         case UNAUTHORIZED:
 792             mAuthStatusText = R.string.auth_unauthorized;
 793             break;
 794         case HOST_NOT_AVAILABLE:
 795             mAuthStatusText = R.string.auth_unknown_host_title;
 796             break;
 797         case INSTANCE_NOT_CONFIGURED:
 798             mAuthStatusText = R.string.auth_not_configured_title;
 799             break;
 800         case FILE_NOT_FOUND:
 801             mAuthStatusText = R.string.auth_incorrect_path_title;
 802             break;
 803         case OAUTH2_ERROR:
 804             mAuthStatusText = R.string.auth_oauth_error;
 805             break;
 806         case OAUTH2_ERROR_ACCESS_DENIED:
 807             mAuthStatusText = R.string.auth_oauth_error_access_denied;
 808             break;
 809         case UNHANDLED_HTTP_CODE:
 810         case UNKNOWN_ERROR:
 811             mAuthStatusText = R.string.auth_unknown_error_title;
 812             break;
 813         default:
 814             mAuthStatusText = 0;
 815             mAuthStatusIcon = 0;
 816         }
 817     }
 818
 819
 820     /**
 821      * Processes the result of the request for and access token send
 822      * to an OAuth authorization server.
 823      *
 824      * @param operation     Operation performed requesting the access token.
 825      * @param result        Result of the operation.
 826      */
 827     private void onGetOAuthAccessTokenFinish(OAuth2GetAccessToken operation, RemoteOperationResult result) {
 828         try {
 829             dismissDialog(DIALOG_OAUTH2_LOGIN_PROGRESS);
 830         } catch (IllegalArgumentException e) {
 831             // NOTHING TO DO ; can't find out what situation that leads to the exception in this code, but user logs signal that it happens
 832         }
 833
 834         String webdav_path = AccountUtils.getWebdavPath(mDiscoveredVersion, true);
 835         if (result.isSuccess() && webdav_path != null) {
 836             /// be gentle with the user
 837             showDialog(DIALOG_LOGIN_PROGRESS);
 838
 839             /// time to test the retrieved access token on the ownCloud server
 840             mOAuthAccessToken = ((OAuth2GetAccessToken)operation).getResultTokenMap().get(OAuth2Constants.KEY_ACCESS_TOKEN);
 841             Log_OC.d(TAG, "Got ACCESS TOKEN: " + mOAuthAccessToken);
 842             mAuthCheckOperation = new ExistenceCheckOperation("", this, false);
 843             WebdavClient client = OwnCloudClientUtils.createOwnCloudClient(Uri.parse(mHostBaseUrl + webdav_path), this);
 844             client.setBearerCredentials(mOAuthAccessToken);
 845             mAuthCheckOperation.execute(client, this, mHandler);
 846
 847         } else {
 848             updateAuthStatusIconAndText(result);
 849             showAuthStatus();
 850             Log_OC.d(TAG, "Access failed: " + result.getLogMessage());
 851         }
 852     }
 853
 854
 855     /**
 856      * Processes the result of the access check performed to try the user credentials.
 857      *
 858      * Creates a new account through the AccountManager.
 859      *
 860      * @param operation     Access check performed.
 861      * @param result        Result of the operation.
 862      */
 863     private void onAuthorizationCheckFinish(ExistenceCheckOperation operation, RemoteOperationResult result) {
 864         try {
 865             dismissDialog(DIALOG_LOGIN_PROGRESS);
 866         } catch (IllegalArgumentException e) {
 867             // NOTHING TO DO ; can't find out what situation that leads to the exception in this code, but user logs signal that it happens
 868         }
 869
 870         if (result.isSuccess()) {
 871             Log_OC.d(TAG, "Successful access - time to save the account");
 872
 873             if (mAction == ACTION_CREATE) {
 874                 createAccount();
 875
 876             } else {
 877                 updateToken();
 878             }
 879
 880             finish();
 881
 882         } else {
 883             updateAuthStatusIconAndText(result);
 884             showAuthStatus();
 885             Log_OC.d(TAG, "Access failed: " + result.getLogMessage());
 886         }
 887     }
 888
 889
 890     /**
 891      * Sets the proper response to get that the Account Authenticator that started this activity saves
 892      * a new authorization token for mAccount.
 893      */
 894     private void updateToken() {
 895         Bundle response = new Bundle();
 896         response.putString(AccountManager.KEY_ACCOUNT_NAME, mAccount.name);
 897         response.putString(AccountManager.KEY_ACCOUNT_TYPE, mAccount.type);
 898         boolean isOAuth = mOAuth2Check.isChecked();
 899         if (isOAuth) {
 900             response.putString(AccountManager.KEY_AUTHTOKEN, mOAuthAccessToken);
 901             // the next line is necessary; by now, notifications are calling directly to the AuthenticatorActivity to update, without AccountManager intervention
 902             mAccountMgr.setAuthToken(mAccount, AccountAuthenticator.AUTH_TOKEN_TYPE_ACCESS_TOKEN, mOAuthAccessToken);
 903         } else {
 904             response.putString(AccountManager.KEY_AUTHTOKEN, mPasswordInput.getText().toString());
 905             mAccountMgr.setPassword(mAccount, mPasswordInput.getText().toString());
 906         }
 907         setAccountAuthenticatorResult(response);
 908     }
 909
 910
 911     /**
 912      * Creates a new account through the Account Authenticator that started this activity.
 913      *
 914      * This makes the account permanent.
 915      *
 916      * TODO Decide how to name the OAuth accounts
 917      */
 918     private void createAccount() {
 919         /// create and save new ownCloud account
 920         boolean isOAuth = mOAuth2Check.isChecked();
 921
 922         Uri uri = Uri.parse(mHostBaseUrl);
 923         String username = mUsernameInput.getText().toString().trim();
 924         if (isOAuth) {
 925             username = "OAuth_user" + (new java.util.Random(System.currentTimeMillis())).nextLong();
 926         }
 927         String accountName = username + "@" + uri.getHost();
 928         if (uri.getPort() >= 0) {
 929             accountName += ":" + uri.getPort();
 930         }
 931         mAccount = new Account(accountName, AccountAuthenticator.ACCOUNT_TYPE);
 932         if (isOAuth) {
 933             mAccountMgr.addAccountExplicitly(mAccount, "", null);  // with our implementation, the password is never input in the app
 934         } else {
 935             mAccountMgr.addAccountExplicitly(mAccount, mPasswordInput.getText().toString(), null);
 936         }
 937
 938         /// add the new account as default in preferences, if there is none already
 939         Account defaultAccount = AccountUtils.getCurrentOwnCloudAccount(this);
 940         if (defaultAccount == null) {
 941             SharedPreferences.Editor editor = PreferenceManager
 942                     .getDefaultSharedPreferences(this).edit();
 943             editor.putString("select_oc_account", accountName);
 944             editor.commit();
 945         }
 946
 947         /// prepare result to return to the Authenticator
 948         //  TODO check again what the Authenticator makes with it; probably has the same effect as addAccountExplicitly, but it's not well done
 949         final Intent intent = new Intent();
 950         intent.putExtra(AccountManager.KEY_ACCOUNT_TYPE,    AccountAuthenticator.ACCOUNT_TYPE);
 951         intent.putExtra(AccountManager.KEY_ACCOUNT_NAME,    mAccount.name);
 952         if (!isOAuth)
 953             intent.putExtra(AccountManager.KEY_AUTHTOKEN,   AccountAuthenticator.ACCOUNT_TYPE); // TODO check this; not sure it's right; maybe
 954         intent.putExtra(AccountManager.KEY_USERDATA,        username);
 955         if (isOAuth) {
 956             mAccountMgr.setAuthToken(mAccount, AccountAuthenticator.AUTH_TOKEN_TYPE_ACCESS_TOKEN, mOAuthAccessToken);
 957         }
 958         /// add user data to the new account; TODO probably can be done in the last parameter addAccountExplicitly, or in KEY_USERDATA
 959         mAccountMgr.setUserData(mAccount, AccountAuthenticator.KEY_OC_VERSION,    mDiscoveredVersion.toString());
 960         mAccountMgr.setUserData(mAccount, AccountAuthenticator.KEY_OC_BASE_URL,   mHostBaseUrl);
 961         if (isOAuth)
 962             mAccountMgr.setUserData(mAccount, AccountAuthenticator.KEY_SUPPORTS_OAUTH2, "TRUE");  // TODO this flag should be unnecessary
 963
 964         setAccountAuthenticatorResult(intent.getExtras());
 965         setResult(RESULT_OK, intent);
 966
 967         /// immediately request for the synchronization of the new account
 968         Bundle bundle = new Bundle();
 969         bundle.putBoolean(ContentResolver.SYNC_EXTRAS_MANUAL, true);
 970         ContentResolver.requestSync(mAccount, AccountAuthenticator.AUTHORITY, bundle);
 971     }
 972
 973
 974     /**
 975      * {@inheritDoc}
 976      *
 977      * Necessary to update the contents of the SSL Dialog
 978      *
 979      * TODO move to some common place for all possible untrusted SSL failures
 980      */
 981     @Override
 982     protected void onPrepareDialog(int id, Dialog dialog, Bundle args) {
 983         switch (id) {
 984         case DIALOG_LOGIN_PROGRESS:
 985         case DIALOG_CERT_NOT_SAVED:
 986         case DIALOG_OAUTH2_LOGIN_PROGRESS:
 987             break;
 988         case DIALOG_SSL_VALIDATOR: {
 989             ((SslValidatorDialog)dialog).updateResult(mLastSslUntrustedServerResult);
 990             break;
 991         }
 992         default:
 993             Log_OC.e(TAG, "Incorrect dialog called with id = " + id);
 994         }
 995     }
 996
 997
 998     /**
 999      * {@inheritDoc}
1000      */
1001     @Override
1002     protected Dialog onCreateDialog(int id) {
1003         Dialog dialog = null;
1004         switch (id) {
1005         case DIALOG_LOGIN_PROGRESS: {
1006             /// simple progress dialog
1007             ProgressDialog working_dialog = new ProgressDialog(this);
1008             working_dialog.setMessage(getResources().getString(R.string.auth_trying_to_login));
1009             working_dialog.setIndeterminate(true);
1010             working_dialog.setCancelable(true);
1011             working_dialog
1012             .setOnCancelListener(new DialogInterface.OnCancelListener() {
1013                 @Override
1014                 public void onCancel(DialogInterface dialog) {
1015                     /// TODO study if this is enough
1016                     Log_OC.i(TAG, "Login canceled");
1017                     if (mOperationThread != null) {
1018                         mOperationThread.interrupt();
1019                         finish();
1020                     }
1021                 }
1022             });
1023             dialog = working_dialog;
1024             break;
1025         }
1026         case DIALOG_OAUTH2_LOGIN_PROGRESS: {
1027             ProgressDialog working_dialog = new ProgressDialog(this);
1028             working_dialog.setMessage(String.format("Getting authorization"));
1029             working_dialog.setIndeterminate(true);
1030             working_dialog.setCancelable(true);
1031             working_dialog
1032             .setOnCancelListener(new DialogInterface.OnCancelListener() {
1033                 @Override
1034                 public void onCancel(DialogInterface dialog) {
1035                     Log_OC.i(TAG, "Login canceled");
1036                     finish();
1037                 }
1038             });
1039             dialog = working_dialog;
1040             break;
1041         }
1042         case DIALOG_SSL_VALIDATOR: {
1043             /// TODO start to use new dialog interface, at least for this (it is a FragmentDialog already)
1044             dialog = SslValidatorDialog.newInstance(this, mLastSslUntrustedServerResult, this);
1045             break;
1046         }
1047         case DIALOG_CERT_NOT_SAVED: {
1048             AlertDialog.Builder builder = new AlertDialog.Builder(this);
1049             builder.setMessage(getResources().getString(R.string.ssl_validator_not_saved));
1050             builder.setCancelable(false);
1051             builder.setPositiveButton(R.string.common_ok, new DialogInterface.OnClickListener() {
1052                 @Override
1053                 public void onClick(DialogInterface dialog, int which) {
1054                     dialog.dismiss();
1055                 };
1056             });
1057             dialog = builder.create();
1058             break;
1059         }
1060         default:
1061             Log_OC.e(TAG, "Incorrect dialog called with id = " + id);
1062         }
1063         return dialog;
1064     }
1065
1066
1067     /**
1068      * Starts and activity to open the 'new account' page in the ownCloud web site
1069      *
1070      * @param view      'Account register' button
1071      */
1072     public void onRegisterClick(View view) {
1073         Intent register = new Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.url_account_register)));
1074         setResult(RESULT_CANCELED);
1075         startActivity(register);
1076     }
1077
1078
1079     /**
1080      * Updates the content and visibility state of the icon and text associated
1081      * to the last check on the ownCloud server.
1082      */
1083     private void showServerStatus() {
1084         TextView tv = (TextView) findViewById(R.id.server_status_text);
1085
1086         if (mServerStatusIcon == 0 && mServerStatusText == 0) {
1087             tv.setVisibility(View.INVISIBLE);
1088
1089         } else {
1090             tv.setText(mServerStatusText);
1091             tv.setCompoundDrawablesWithIntrinsicBounds(mServerStatusIcon, 0, 0, 0);
1092             tv.setVisibility(View.VISIBLE);
1093         }
1094
1095     }
1096
1097
1098     /**
1099      * Updates the content and visibility state of the icon and text associated
1100      * to the interactions with the OAuth authorization server.
1101      */
1102     private void showAuthStatus() {
1103         if (mAuthStatusIcon == 0 && mAuthStatusText == 0) {
1104             mAuthStatusLayout.setVisibility(View.INVISIBLE);
1105
1106         } else {
1107             mAuthStatusLayout.setText(mAuthStatusText);
1108             mAuthStatusLayout.setCompoundDrawablesWithIntrinsicBounds(mAuthStatusIcon, 0, 0, 0);
1109             mAuthStatusLayout.setVisibility(View.VISIBLE);
1110         }
1111     }
1112
1113
1114     private void showRefreshButton() {
1115         mHostUrlInput.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_action_refresh_black, 0);
1116         mRefreshButtonEnabled = true;
1117     }
1118
1119     private void hideRefreshButton() {
1120         mHostUrlInput.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
1121         mRefreshButtonEnabled = false;
1122     }
1123
1124     /**
1125      * Called when the refresh button in the input field for ownCloud host is clicked.
1126      *
1127      * Performs a new check on the URL in the input field.
1128      *
1129      * @param view      Refresh 'button'
1130      */
1131     public void onRefreshClick(View view) {
1132         checkOcServer();
1133     }
1134
1135
1136     /**
1137      * Called when the eye icon in the password field is clicked.
1138      *
1139      * Toggles the visibility of the password in the field.
1140      *
1141      * @param view      'View password' 'button'
1142      */
1143     public void onViewPasswordClick(View view) {
1144         int selectionStart = mPasswordInput.getSelectionStart();
1145         int selectionEnd = mPasswordInput.getSelectionEnd();
1146         int input_type = mPasswordInput.getInputType();
1147         if ((input_type & InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD) == InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD) {
1148             input_type = InputType.TYPE_CLASS_TEXT
1149                     | InputType.TYPE_TEXT_VARIATION_PASSWORD;
1150         } else {
1151             input_type = InputType.TYPE_CLASS_TEXT
1152                     | InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD;
1153         }
1154         mPasswordInput.setInputType(input_type);
1155         mPasswordInput.setSelection(selectionStart, selectionEnd);
1156     }
1157
1158
1159     /**
1160      * Called when the checkbox for OAuth authorization is clicked.
1161      *
1162      * Hides or shows the input fields for user & password.
1163      *
1164      * @param view      'View password' 'button'
1165      */
1166     public void onCheckClick(View view) {
1167         CheckBox oAuth2Check = (CheckBox)view;
1168         changeViewByOAuth2Check(oAuth2Check.isChecked());
1169
1170     }
1171
1172     /**
1173      * Changes the visibility of input elements depending upon the kind of authorization
1174      * chosen by the user: basic or OAuth
1175      *
1176      * @param checked       'True' when OAuth is selected.
1177      */
1178     public void changeViewByOAuth2Check(Boolean checked) {
1179
1180         if (checked) {
1181             mOAuthAuthEndpointText.setVisibility(View.VISIBLE);
1182             mOAuthTokenEndpointText.setVisibility(View.VISIBLE);
1183             mUsernameInput.setVisibility(View.GONE);
1184             mPasswordInput.setVisibility(View.GONE);
1185             mViewPasswordButton.setVisibility(View.GONE);
1186         } else {
1187             mOAuthAuthEndpointText.setVisibility(View.GONE);
1188             mOAuthTokenEndpointText.setVisibility(View.GONE);
1189             mUsernameInput.setVisibility(View.VISIBLE);
1190             mPasswordInput.setVisibility(View.VISIBLE);
1191             mViewPasswordButton.setVisibility(View.INVISIBLE);
1192         }
1193
1194     }
1195
1196     /**
1197      * Called from SslValidatorDialog when a new server certificate was correctly saved.
1198      */
1199     public void onSavedCertificate() {
1200         mOperationThread = mOcServerChkOperation.retry(this, mHandler);
1201     }
1202
1203     /**
1204      * Called from SslValidatorDialog when a new server certificate could not be saved
1205      * when the user requested it.
1206      */
1207     @Override
1208     public void onFailedSavingCertificate() {
1209         showDialog(DIALOG_CERT_NOT_SAVED);
1210     }
1211
1212
1213     /**
1214      *  Called when the 'action' button in an IME is pressed ('enter' in software keyboard).
1215      *
1216      *  Used to trigger the authorization check when the user presses 'enter' after writing the password.
1217      */
1218     @Override
1219     public boolean onEditorAction(TextView inputField, int actionId, KeyEvent event) {
1220         if (inputField != null && inputField.equals(mPasswordInput) &&
1221                 actionId == EditorInfo.IME_ACTION_DONE) {
1222             if (mOkButton.isEnabled()) {
1223                 mOkButton.performClick();
1224             }
1225         }
1226         return false;   // always return false to grant that the software keyboard is hidden anyway
1227     }
1228
1229
1230     private abstract static class RightDrawableOnTouchListener implements OnTouchListener  {
1231
1232         private int fuzz = 10;
1233
1234         /**
1235          * {@inheritDoc}
1236          */
1237         @Override
1238         public boolean onTouch(View view, MotionEvent event) {
1239             if (event.getAction() == MotionEvent.ACTION_DOWN) {
1240                 Drawable rightDrawable = null;
1241                 if (view instanceof TextView) {
1242                     Drawable[] drawables = ((TextView)view).getCompoundDrawables();
1243                     if (drawables.length > 2) {
1244                         rightDrawable = drawables[2];
1245                     }
1246                 }
1247                 if (rightDrawable != null) {
1248                     final int x = (int) event.getX();
1249                     final int y = (int) event.getY();
1250                     final Rect bounds = rightDrawable.getBounds();
1251                     if (x >= (view.getRight() - bounds.width() - fuzz) && x <= (view.getRight() - view.getPaddingRight() + fuzz)
1252                             && y >= (view.getPaddingTop() - fuzz) && y <= (view.getHeight() - view.getPaddingBottom()) + fuzz) {
1253
1254                         return onDrawableTouch(event);
1255                     }
1256                 }
1257             }
1258             return false;
1259         }
1260
1261         public abstract boolean onDrawableTouch(final MotionEvent event);
1262     }
1263
1264 }