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

/* ownCloud Android client application
 *   Copyright (C) 2012  Bartek Przybylski
 *   Copyright (C) 2012-2013 ownCloud Inc.
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License version 2,
 *   as published by the Free Software Foundation.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package com.owncloud.android.authentication;

import java.security.cert.X509Certificate;
import java.util.Map;

import android.accounts.Account;
import android.accounts.AccountManager;
import android.app.Dialog;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.SharedPreferences;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.net.http.SslError;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.preference.PreferenceManager;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.text.Editable;
import android.text.InputType;
import android.text.TextWatcher;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnFocusChangeListener;
import android.view.View.OnTouchListener;
import android.view.Window;
import android.view.inputmethod.EditorInfo;
import android.webkit.SslErrorHandler;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.TextView.OnEditorActionListener;
import android.widget.Toast;

import com.actionbarsherlock.app.SherlockDialogFragment;
import com.owncloud.android.MainApp;
import com.owncloud.android.R;
import com.owncloud.android.authentication.SsoWebViewClient.SsoWebViewClientListener;
import com.owncloud.android.lib.common.accounts.AccountTypeUtils;
import com.owncloud.android.lib.common.accounts.AccountUtils.Constants;
import com.owncloud.android.operations.DetectAuthenticationMethodOperation.AuthenticationMethod;
import com.owncloud.android.operations.GetServerInfoOperation;
import com.owncloud.android.operations.OAuth2GetAccessToken;

import com.owncloud.android.lib.common.network.CertificateCombinedException;
import com.owncloud.android.lib.common.operations.OnRemoteOperationListener;
import com.owncloud.android.lib.common.operations.RemoteOperation;
import com.owncloud.android.lib.common.operations.RemoteOperationResult;
import com.owncloud.android.lib.common.operations.RemoteOperationResult.ResultCode;
import com.owncloud.android.lib.resources.files.ExistenceCheckRemoteOperation;
import com.owncloud.android.lib.resources.users.GetRemoteUserNameOperation;

import com.owncloud.android.services.OperationsService;
import com.owncloud.android.services.OperationsService.OperationsServiceBinder;
import com.owncloud.android.ui.dialog.IndeterminateProgressDialog;
import com.owncloud.android.ui.dialog.SamlWebViewDialog;
import com.owncloud.android.ui.dialog.SslUntrustedCertDialog;
import com.owncloud.android.ui.dialog.SslUntrustedCertDialog.OnSslUntrustedCertListener;
import com.owncloud.android.utils.Log_OC;
import com.owncloud.android.lib.resources.status.OwnCloudVersion;

/**
 * This Activity is used to add an ownCloud account to the App
 * 
 * @author Bartek Przybylski
 * @author David A. Velasco
 * @author masensio
 */
public class AuthenticatorActivity extends AccountAuthenticatorActivity
implements  OnRemoteOperationListener, OnFocusChangeListener, OnEditorActionListener, 
SsoWebViewClientListener, OnSslUntrustedCertListener {

    private static final String TAG = AuthenticatorActivity.class.getSimpleName();

    public static final String EXTRA_ACCOUNT = "ACCOUNT";
    public static final String EXTRA_USER_NAME = "USER_NAME";
    public static final String EXTRA_HOST_NAME = "HOST_NAME";
    public static final String EXTRA_ACTION = "ACTION";
    public static final String EXTRA_ENFORCED_UPDATE = "ENFORCE_UPDATE";

    private static final String KEY_AUTH_MESSAGE_VISIBILITY = "AUTH_MESSAGE_VISIBILITY";
    private static final String KEY_AUTH_MESSAGE_TEXT = "AUTH_MESSAGE_TEXT";
    private static final String KEY_HOST_URL_TEXT = "HOST_URL_TEXT";
    private static final String KEY_OC_VERSION = "OC_VERSION";
    private static final String KEY_ACCOUNT = "ACCOUNT";
    private static final String KEY_SERVER_VALID = "SERVER_VALID";
    private static final String KEY_SERVER_CHECKED = "SERVER_CHECKED";
    private static final String KEY_SERVER_CHECK_IN_PROGRESS = "SERVER_CHECK_IN_PROGRESS"; 
    private static final String KEY_SERVER_STATUS_TEXT = "SERVER_STATUS_TEXT";
    private static final String KEY_SERVER_STATUS_ICON = "SERVER_STATUS_ICON";
    private static final String KEY_IS_SSL_CONN = "IS_SSL_CONN";
    private static final String KEY_PASSWORD_VISIBLE = "PASSWORD_VISIBLE";
    private static final String KEY_AUTH_STATUS_TEXT = "AUTH_STATUS_TEXT";
    private static final String KEY_AUTH_STATUS_ICON = "AUTH_STATUS_ICON";
    private static final String KEY_REFRESH_BUTTON_ENABLED = "KEY_REFRESH_BUTTON_ENABLED";
    private static final String KEY_SERVER_AUTH_METHOD = "KEY_SERVER_AUTH_METHOD";
    private static final String KEY_DETECT_AUTH_OP_ID = "KEY_DETECT_AUTH_OP_ID";

    private static final String AUTH_ON = "on";
    //private static final String AUTH_OFF = "off";
    private static final String AUTH_OPTIONAL = "optional";

    public static final byte ACTION_CREATE = 0;
    public static final byte ACTION_UPDATE_TOKEN = 1;

    private static final String SAML_DIALOG_TAG = "SAML_DIALOG";
    private static final String WAIT_DIALOG_TAG = "WAIT_DIALOG";

    private String mHostBaseUrl;                // TODO remove
    private OwnCloudVersion mDiscoveredVersion; // TODO remove

    private String mAuthMessageText;
    private int mAuthMessageVisibility, mServerStatusText, mServerStatusIcon;
    private boolean mServerIsChecked, mServerIsValid, mIsSslConn;
    private AuthenticationMethod mServerAuthMethod = AuthenticationMethod.UNKNOWN;

    private int mGetServerInfoOpId = -1;
    private int mOauth2GetAccessTokenOpId = -1;

    private int mAuthStatusText, mAuthStatusIcon;    
    private TextView mAuthStatusLayout;

    private final Handler mHandler = new Handler();
    private GetServerInfoOperation mServerInfoOperation;

    private int mExistenceCheckOpId = -1;
    private int mGetUserNameOpId = -1;
    
    private Uri mNewCapturedUriFromOAuth2Redirection;

    private AccountManager mAccountMgr;
    private boolean mJustCreated;
    private byte mAction;
    private Account mAccount;

    private TextView mAuthMessage;

    private EditText mHostUrlInput;
    private boolean mHostUrlInputEnabled;
    private View mRefreshButton;

    private String mAuthTokenType;

    private EditText mUsernameInput;
    private EditText mPasswordInput;

    private CheckBox mOAuth2Check;

    private TextView mOAuthAuthEndpointText;
    private TextView mOAuthTokenEndpointText;

    private SamlWebViewDialog mSamlDialog;

    private View mOkButton;

    private String mAuthToken;

    private boolean mResumed; // Control if activity is resumed

    public static String DIALOG_UNTRUSTED_CERT = "DIALOG_UNTRUSTED_CERT";
    
    private ServiceConnection mOperationsServiceConnection = null;
    
    private OperationsServiceBinder mOperationsServiceBinder = null;

    private GetServerInfoOperation.ServerInfo mServerInfo;

    /**
     * {@inheritDoc}
     * 
     * IMPORTANT ENTRY POINT 1: activity is shown to the user
     */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().requestFeature(Window.FEATURE_NO_TITLE);

        // bind to Operations Service
        mOperationsServiceConnection = new OperationsServiceConnection();
        if (!bindService(new Intent(this, OperationsService.class), 
                mOperationsServiceConnection, 
                Context.BIND_AUTO_CREATE)) {
            Toast.makeText(this, 
                    R.string.error_cant_bind_to_operations_service, 
                    Toast.LENGTH_LONG)
                        .show();
            finish();
        }
                
        /// set view and get references to view elements
        setContentView(R.layout.account_setup);
        mAuthMessage = (TextView) findViewById(R.id.auth_message);
        mHostUrlInput = (EditText) findViewById(R.id.hostUrlInput);
        mHostUrlInput.setText(getString(R.string.server_url));  // valid although R.string.server_url is an empty string
        mUsernameInput = (EditText) findViewById(R.id.account_username);
        mPasswordInput = (EditText) findViewById(R.id.account_password);
        mOAuthAuthEndpointText = (TextView)findViewById(R.id.oAuthEntryPoint_1);
        mOAuthTokenEndpointText = (TextView)findViewById(R.id.oAuthEntryPoint_2);
        mOAuth2Check = (CheckBox) findViewById(R.id.oauth_onOff_check);
        mOkButton = findViewById(R.id.buttonOK);
        mAuthStatusLayout = (TextView) findViewById(R.id.auth_status_text); 

        /// set Host Url Input Enabled
        mHostUrlInputEnabled = getResources().getBoolean(R.bool.show_server_url_input);

        /// set visibility of link for new users
        boolean accountRegisterVisibility = getResources().getBoolean(R.bool.show_welcome_link);
        Button welcomeLink = (Button) findViewById(R.id.welcome_link);
        if (welcomeLink != null) {
            if (accountRegisterVisibility) {
                welcomeLink.setVisibility(View.VISIBLE);
                welcomeLink.setText(String.format(getString(R.string.auth_register), getString(R.string.app_name)));            
            } else {
                findViewById(R.id.welcome_link).setVisibility(View.GONE);
            }
        }

        /// initialization
        mAccountMgr = AccountManager.get(this);
        mNewCapturedUriFromOAuth2Redirection = null;
        mAction = getIntent().getByteExtra(EXTRA_ACTION, ACTION_CREATE); 
        mAccount = null;
        mHostBaseUrl = "";
        boolean refreshButtonEnabled = false;

        // URL input configuration applied
        if (!mHostUrlInputEnabled)
        {
            findViewById(R.id.hostUrlFrame).setVisibility(View.GONE);
            mRefreshButton = findViewById(R.id.centeredRefreshButton);

        } else {
            mRefreshButton = findViewById(R.id.embeddedRefreshButton);
        }

        if (savedInstanceState == null) {
            mResumed = false;
            /// connection state and info
            mAuthMessageVisibility = View.GONE;
            mServerStatusText = mServerStatusIcon = 0;
            mServerIsValid = false;
            mServerIsChecked = false;
            mIsSslConn = false;
            mAuthStatusText = mAuthStatusIcon = 0;

            /// retrieve extras from intent
            mAccount = getIntent().getExtras().getParcelable(EXTRA_ACCOUNT);
            if (mAccount != null) {
                String ocVersion = mAccountMgr.getUserData(mAccount, Constants.KEY_OC_VERSION);
                if (ocVersion != null) {
                    mDiscoveredVersion = new OwnCloudVersion(ocVersion);
                }
                mHostBaseUrl = normalizeUrl(mAccountMgr.getUserData(mAccount, Constants.KEY_OC_BASE_URL));
                mHostUrlInput.setText(mHostBaseUrl);
                String userName = mAccount.name.substring(0, mAccount.name.lastIndexOf('@'));
                mUsernameInput.setText(userName);

            }
            initAuthorizationMethod();  // checks intent and setup.xml to determine mCurrentAuthorizationMethod
            mJustCreated = true;

            if (mAction == ACTION_UPDATE_TOKEN || !mHostUrlInputEnabled) {
                checkOcServer(); 
            }

        } else {
            mResumed = true;
            /// connection state and info
            mAuthMessageVisibility = savedInstanceState.getInt(KEY_AUTH_MESSAGE_VISIBILITY);
            mAuthMessageText = savedInstanceState.getString(KEY_AUTH_MESSAGE_TEXT);
            mServerIsValid = savedInstanceState.getBoolean(KEY_SERVER_VALID);
            mServerIsChecked = savedInstanceState.getBoolean(KEY_SERVER_CHECKED);
            mServerStatusText = savedInstanceState.getInt(KEY_SERVER_STATUS_TEXT);
            mServerStatusIcon = savedInstanceState.getInt(KEY_SERVER_STATUS_ICON);
            mIsSslConn = savedInstanceState.getBoolean(KEY_IS_SSL_CONN);
            mAuthStatusText = savedInstanceState.getInt(KEY_AUTH_STATUS_TEXT);
            mAuthStatusIcon = savedInstanceState.getInt(KEY_AUTH_STATUS_ICON);
            if (savedInstanceState.getBoolean(KEY_PASSWORD_VISIBLE, false)) {
                showPassword();
            }

            /// server data
            String ocVersion = savedInstanceState.getString(KEY_OC_VERSION);
            if (ocVersion != null) {
                mDiscoveredVersion = new OwnCloudVersion(ocVersion);
            }
            mHostBaseUrl = savedInstanceState.getString(KEY_HOST_URL_TEXT);

            // account data, if updating
            mAccount = savedInstanceState.getParcelable(KEY_ACCOUNT);
            mAuthTokenType = savedInstanceState.getString(AccountAuthenticator.KEY_AUTH_TOKEN_TYPE);
            if (mAuthTokenType == null) {
                mAuthTokenType =  AccountTypeUtils.getAuthTokenTypePass(MainApp.getAccountType());

            }

            // check if server check was interrupted by a configuration change
            if (savedInstanceState.getBoolean(KEY_SERVER_CHECK_IN_PROGRESS, false)) {
                checkOcServer();
            }            

            // refresh button enabled
            refreshButtonEnabled = savedInstanceState.getBoolean(KEY_REFRESH_BUTTON_ENABLED);


            mServerAuthMethod = AuthenticationMethod.valueOf(
                    savedInstanceState.getString(KEY_SERVER_AUTH_METHOD));
            mGetServerInfoOpId = savedInstanceState.getInt(KEY_DETECT_AUTH_OP_ID);

        }

        if (mAuthMessageVisibility== View.VISIBLE) {
            showAuthMessage(mAuthMessageText);
        }
        else {
            hideAuthMessage();
        }
        adaptViewAccordingToAuthenticationMethod();
        showServerStatus();
        showAuthStatus();

        if (mAction == ACTION_UPDATE_TOKEN) {
            /// lock things that should not change
            mHostUrlInput.setEnabled(false);
            mHostUrlInput.setFocusable(false);
            mUsernameInput.setEnabled(false);
            mUsernameInput.setFocusable(false);
            mOAuth2Check.setVisibility(View.GONE);
        }

        showRefreshButton(mServerIsChecked && !mServerIsValid && refreshButtonEnabled);
        mOkButton.setEnabled(mServerIsValid); // state not automatically recovered in configuration changes

        if (AccountTypeUtils.getAuthTokenTypeSamlSessionCookie(MainApp.getAccountType()).equals(mAuthTokenType) || 
                !AUTH_OPTIONAL.equals(getString(R.string.auth_method_oauth2))) {
            mOAuth2Check.setVisibility(View.GONE);
        }

        mPasswordInput.setText("");     // clean password to avoid social hacking (disadvantage: password in removed if the device is turned aside)

        /// bind view elements to listeners and other friends
        mHostUrlInput.setOnFocusChangeListener(this);
        mHostUrlInput.setImeOptions(EditorInfo.IME_ACTION_NEXT);
        mHostUrlInput.setOnEditorActionListener(this);
        mHostUrlInput.addTextChangedListener(new TextWatcher() {

            @Override
            public void afterTextChanged(Editable s) {
                if (!mHostBaseUrl.equals(normalizeUrl(mHostUrlInput.getText().toString()))) {
                    mOkButton.setEnabled(false);
                }
            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                if (!mResumed) {
                    mAuthStatusIcon = 0;
                    mAuthStatusText = 0;
                    showAuthStatus();                    
                }
                mResumed = false;
            }
        });

        mPasswordInput.setOnFocusChangeListener(this);
        mPasswordInput.setImeOptions(EditorInfo.IME_ACTION_DONE);
        mPasswordInput.setOnEditorActionListener(this);
        mPasswordInput.setOnTouchListener(new RightDrawableOnTouchListener() {
            @Override
            public boolean onDrawableTouch(final MotionEvent event) {
                if (event.getAction() == MotionEvent.ACTION_UP) {
                    AuthenticatorActivity.this.onViewPasswordClick();
                }
                return true;
            }
        });

        findViewById(R.id.scroll).setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent event) {
                if (event.getAction() == MotionEvent.ACTION_DOWN) {
                    if (AccountTypeUtils.getAuthTokenTypeSamlSessionCookie(MainApp.getAccountType()).equals(mAuthTokenType) &&
                            mHostUrlInput.hasFocus()) {
                        checkOcServer();
                    }
                }
                return false;
            }
        });
        
    }



    private void initAuthorizationMethod() {
        boolean oAuthRequired = false;
        boolean samlWebSsoRequired = false;

        mAuthTokenType = getIntent().getExtras().getString(AccountAuthenticator.KEY_AUTH_TOKEN_TYPE);
        mAccount = getIntent().getExtras().getParcelable(EXTRA_ACCOUNT);

        // TODO could be a good moment to validate the received token type, if not null

        if (mAuthTokenType == null) {    
            if (mAccount != null) {
                /// same authentication method than the one used to create the account to update
                oAuthRequired = (mAccountMgr.getUserData(mAccount, Constants.KEY_SUPPORTS_OAUTH2) != null);
                samlWebSsoRequired = (mAccountMgr.getUserData(mAccount, Constants.KEY_SUPPORTS_SAML_WEB_SSO) != null);

            } else {
                /// use the one set in setup.xml
                oAuthRequired = AUTH_ON.equals(getString(R.string.auth_method_oauth2));
                samlWebSsoRequired = AUTH_ON.equals(getString(R.string.auth_method_saml_web_sso));            
            }
            if (oAuthRequired) {
                mAuthTokenType = AccountTypeUtils.getAuthTokenTypeAccessToken(MainApp.getAccountType());
            } else if (samlWebSsoRequired) {
                mAuthTokenType = AccountTypeUtils.getAuthTokenTypeSamlSessionCookie(MainApp.getAccountType());
            } else {
                mAuthTokenType = AccountTypeUtils.getAuthTokenTypePass(MainApp.getAccountType());
            }
        }

        if (mAccount != null) {
            String userName = mAccount.name.substring(0, mAccount.name.lastIndexOf('@'));
            mUsernameInput.setText(userName);
        }

        mOAuth2Check.setChecked(AccountTypeUtils.getAuthTokenTypeAccessToken(MainApp.getAccountType()).equals(mAuthTokenType));

    }

    /**
     * Saves relevant state before {@link #onPause()}
     * 
     * Do NOT save {@link #mNewCapturedUriFromOAuth2Redirection}; it keeps a temporal flag, intended to defer the 
     * processing of the redirection caught in {@link #onNewIntent(Intent)} until {@link #onResume()} 
     * 
     * See {@link #loadSavedInstanceState(Bundle)}
     */
    @Override
    protected void onSaveInstanceState(Bundle outState) {
        //Log.wtf(TAG, "onSaveInstanceState init" );
        super.onSaveInstanceState(outState);

        /// connection state and info
        outState.putInt(KEY_AUTH_MESSAGE_VISIBILITY, mAuthMessage.getVisibility());
        outState.putString(KEY_AUTH_MESSAGE_TEXT, mAuthMessage.getText().toString());
        outState.putInt(KEY_SERVER_STATUS_TEXT, mServerStatusText);
        outState.putInt(KEY_SERVER_STATUS_ICON, mServerStatusIcon);
        outState.putBoolean(KEY_SERVER_VALID, mServerIsValid);
        outState.putBoolean(KEY_SERVER_CHECKED, mServerIsChecked);
        outState.putBoolean(KEY_SERVER_CHECK_IN_PROGRESS, (!mServerIsValid && mServerInfoOperation != null));
        outState.putBoolean(KEY_IS_SSL_CONN, mIsSslConn);
        outState.putBoolean(KEY_PASSWORD_VISIBLE, isPasswordVisible());
        outState.putInt(KEY_AUTH_STATUS_ICON, mAuthStatusIcon);
        outState.putInt(KEY_AUTH_STATUS_TEXT, mAuthStatusText);

        /// server data
        if (mDiscoveredVersion != null) {
            outState.putString(KEY_OC_VERSION, mDiscoveredVersion.getVersion());
        }
        outState.putString(KEY_HOST_URL_TEXT, mHostBaseUrl);

        /// account data, if updating
        if (mAccount != null) {
            outState.putParcelable(KEY_ACCOUNT, mAccount);
        }
        outState.putString(AccountAuthenticator.KEY_AUTH_TOKEN_TYPE, mAuthTokenType);

        // refresh button enabled
        outState.putBoolean(KEY_REFRESH_BUTTON_ENABLED, (mRefreshButton.getVisibility() == View.VISIBLE));
        
        outState.putString(KEY_SERVER_AUTH_METHOD, mServerAuthMethod.name());
        outState.putInt(KEY_DETECT_AUTH_OP_ID, mGetServerInfoOpId);
        //Log.wtf(TAG, "onSaveInstanceState end" );
    }


    /**
     * The redirection triggered by the OAuth authentication server as response to the GET AUTHORIZATION request
     * is caught here.
     * 
     * To make this possible, this activity needs to be qualified with android:launchMode = "singleTask" in the
     * AndroidManifest.xml file.
     */
    @Override
    protected void onNewIntent (Intent intent) {
        Log_OC.d(TAG, "onNewIntent()");
        Uri data = intent.getData();
        if (data != null && data.toString().startsWith(getString(R.string.oauth2_redirect_uri))) {
            mNewCapturedUriFromOAuth2Redirection = data;
        }
    }


    /**
     * The redirection triggered by the OAuth authentication server as response to the GET AUTHORIZATION, and 
     * deferred in {@link #onNewIntent(Intent)}, is processed here.
     */
    @Override
    protected void onResume() {
        //Log.wtf(TAG, "onResume init" );
        super.onResume();
        
        if (mAction == ACTION_UPDATE_TOKEN && mJustCreated && getIntent().getBooleanExtra(EXTRA_ENFORCED_UPDATE, false)) {
            if (AccountTypeUtils.getAuthTokenTypeAccessToken(MainApp.getAccountType()).equals(mAuthTokenType)) {
                //Toast.makeText(this, R.string.auth_expired_oauth_token_toast, Toast.LENGTH_LONG).show();
                showAuthMessage(getString(R.string.auth_expired_oauth_token_toast));
            } else if (AccountTypeUtils.getAuthTokenTypeSamlSessionCookie(MainApp.getAccountType()).equals(mAuthTokenType)) {
                //Toast.makeText(this, R.string.auth_expired_saml_sso_token_toast, Toast.LENGTH_LONG).show();
                showAuthMessage(getString(R.string.auth_expired_saml_sso_token_toast));
            } else {
                //Toast.makeText(this, R.string.auth_expired_basic_auth_toast, Toast.LENGTH_LONG).show();
                showAuthMessage(getString(R.string.auth_expired_basic_auth_toast));
            }
        }

        if (mNewCapturedUriFromOAuth2Redirection != null) {
            getOAuth2AccessTokenFromCapturedRedirection();            
        }
        
        mJustCreated = false;

        if (mOperationsServiceBinder != null) {
            doOnResumeAndBound();
        }
        
        //Log.wtf(TAG, "onResume end" );
    }

    
    @Override
    protected void onPause() {
        //Log.wtf(TAG, "onPause init" );
        if (mOperationsServiceBinder != null) {
            //Log.wtf(TAG, "unregistering to listen for operation callbacks" );
            mOperationsServiceBinder.removeOperationListener(this);
        }
        super.onPause();
        //Log.wtf(TAG, "onPause end" );
    }
    
    @Override
    protected void onDestroy() {
        if (mOperationsServiceConnection != null) {
            unbindService(mOperationsServiceConnection);
            mOperationsServiceBinder = null;
        }
        super.onDestroy();
    }


    /**
     * Parses the redirection with the response to the GET AUTHORIZATION request to the 
     * oAuth server and requests for the access token (GET ACCESS TOKEN)
     */
    private void getOAuth2AccessTokenFromCapturedRedirection() {
        /// Parse data from OAuth redirection
        String queryParameters = mNewCapturedUriFromOAuth2Redirection.getQuery();
        mNewCapturedUriFromOAuth2Redirection = null;

        /// Showing the dialog with instructions for the user.
        IndeterminateProgressDialog dialog = 
                IndeterminateProgressDialog.newInstance(R.string.auth_getting_authorization, true);
        dialog.show(getSupportFragmentManager(), WAIT_DIALOG_TAG);

        /// GET ACCESS TOKEN to the oAuth server
        Intent getServerInfoIntent = new Intent();
        getServerInfoIntent.setAction(OperationsService.ACTION_OAUTH2_GET_ACCESS_TOKEN);
        
        getServerInfoIntent.putExtra(
                OperationsService.EXTRA_SERVER_URL, 
                mOAuthTokenEndpointText.getText().toString().trim());
        
        getServerInfoIntent.putExtra(
                OperationsService.EXTRA_OAUTH2_QUERY_PARAMETERS, 
                queryParameters);
        
        if (mOperationsServiceBinder != null) {
            //Log.wtf(TAG, "getting access token..." );
            mOauth2GetAccessTokenOpId = mOperationsServiceBinder.newOperation(getServerInfoIntent);
        }
    }



    /**
     * Handles the change of focus on the text inputs for the server URL and the password
     */
    public void onFocusChange(View view, boolean hasFocus) {
        if (view.getId() == R.id.hostUrlInput) {   
            if (!hasFocus) {
                onUrlInputFocusLost((TextView) view);
            }
            else {
                showRefreshButton(false);
            }

        } else if (view.getId() == R.id.account_password) {
            onPasswordFocusChanged((TextView) view, hasFocus);
        }
    }


    /**
     * Handles changes in focus on the text input for the server URL.
     * 
     * IMPORTANT ENTRY POINT 2: When (!hasFocus), user wrote the server URL and changed to 
     * other field. The operation to check the existence of the server in the entered URL is
     * started. 
     * 
     * When hasFocus:    user 'comes back' to write again the server URL.
     * 
     * @param hostInput     TextView with the URL input field receiving the change of focus.
     */
    private void onUrlInputFocusLost(TextView hostInput) {
        if (!mHostBaseUrl.equals(normalizeUrl(mHostUrlInput.getText().toString()))) {
            checkOcServer();
        } else {
            mOkButton.setEnabled(mServerIsValid);
            showRefreshButton(!mServerIsValid);
        }
    }


    private void checkOcServer() {
        String uri = mHostUrlInput.getText().toString().trim();

        if (!mHostUrlInputEnabled){
            uri = getString(R.string.server_url).trim();
        }

        mServerIsValid = false;
        mServerIsChecked = false;
        mOkButton.setEnabled(false);
        mDiscoveredVersion = null;
        mServerAuthMethod = AuthenticationMethod.UNKNOWN;
        showRefreshButton(false);
        
        if (uri.length() != 0) {
            mServerStatusText = R.string.auth_testing_connection;
            mServerStatusIcon = R.drawable.progress_small;
            showServerStatus();
            
            Intent getServerInfoIntent = new Intent();
            getServerInfoIntent.setAction(OperationsService.ACTION_GET_SERVER_INFO);
            getServerInfoIntent.putExtra(OperationsService.EXTRA_SERVER_URL, uri);
            getServerInfoIntent.putExtra(OperationsService.EXTRA_AUTH_TOKEN_TYPE, mAuthTokenType);
            if (mOperationsServiceBinder != null) {
                //Log.wtf(TAG, "checking server..." );
                mGetServerInfoOpId = mOperationsServiceBinder.newOperation(getServerInfoIntent);
            }
            
        } else {
            mServerStatusText = 0;
            mServerStatusIcon = 0;
            showServerStatus();
        }
    }


    /**
     * Handles changes in focus on the text input for the password (basic authorization).
     * 
     * When (hasFocus), the button to toggle password visibility is shown.
     * 
     * When (!hasFocus), the button is made invisible and the password is hidden.
     * 
     * @param passwordInput    TextView with the password input field receiving the change of focus.
     * @param hasFocus          'True' if focus is received, 'false' if is lost
     */
    private void onPasswordFocusChanged(TextView passwordInput, boolean hasFocus) {
        if (hasFocus) {
            showViewPasswordButton();
        } else {
            hidePassword();
            hidePasswordButton();
        }
    }


    private void showViewPasswordButton() {
        //int drawable = android.R.drawable.ic_menu_view;
        int drawable = R.drawable.ic_view;
        if (isPasswordVisible()) {
            //drawable = android.R.drawable.ic_secure;
            drawable = R.drawable.ic_hide;
        }
        mPasswordInput.setCompoundDrawablesWithIntrinsicBounds(0, 0, drawable, 0);
    }

    private boolean isPasswordVisible() {
        return ((mPasswordInput.getInputType() & InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD) == InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
    }

    private void hidePasswordButton() {
        mPasswordInput.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
    }

    private void showPassword() {
        mPasswordInput.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
        showViewPasswordButton();
    }

    private void hidePassword() {
        mPasswordInput.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
        showViewPasswordButton();
    }

    /**
     * Checks the credentials of the user in the root of the ownCloud server
     * before creating a new local account.
     * 
     * For basic authorization, a check of existence of the root folder is
     * performed.
     * 
     * For OAuth, starts the flow to get an access token; the credentials test 
     * is postponed until it is available.
     * 
     * IMPORTANT ENTRY POINT 4
     * 
     * @param view      OK button
     */
    public void onOkClick(View view) {
        // this check should be unnecessary
        if (mDiscoveredVersion == null || !mDiscoveredVersion.isVersionValid()  || mHostBaseUrl == null || mHostBaseUrl.length() == 0) {
            mServerStatusIcon = R.drawable.common_error;
            mServerStatusText = R.string.auth_wtf_reenter_URL;
            showServerStatus();
            mOkButton.setEnabled(false);
            Log_OC.wtf(TAG,  "The user was allowed to click 'connect' to an unchecked server!!");
            return;
        }

        if (AccountTypeUtils.getAuthTokenTypeAccessToken(MainApp.getAccountType()).equals(mAuthTokenType)) {
            startOauthorization();
        } else if (AccountTypeUtils.getAuthTokenTypeSamlSessionCookie(MainApp.getAccountType()).equals(mAuthTokenType)) { 
            startSamlBasedFederatedSingleSignOnAuthorization();
        } else {
            checkBasicAuthorization();
        }
    }


    /**
     * Tests the credentials entered by the user performing a check of existence on 
     * the root folder of the ownCloud server.
     */
    private void checkBasicAuthorization() {
        /// get the path to the root folder through WebDAV from the version server
        String webdav_path = AccountUtils.getWebdavPath(mDiscoveredVersion, mAuthTokenType);

        /// get basic credentials entered by user
        String username = mUsernameInput.getText().toString();
        String password = mPasswordInput.getText().toString();

        /// be gentle with the user
        IndeterminateProgressDialog dialog = 
                IndeterminateProgressDialog.newInstance(R.string.auth_trying_to_login, true);
        dialog.show(getSupportFragmentManager(), WAIT_DIALOG_TAG);

        /// test credentials accessing the root folder
        String remotePath ="";
        boolean successIfAbsent = false;
        boolean followRedirects = true;
        startExistenceCheckRemoteOperation(remotePath, this, successIfAbsent, webdav_path, username, password, followRedirects);
        
    }

    private void startExistenceCheckRemoteOperation(String remotePath, Context context, boolean successIfAbsent, String webdav_path,
            String username, String password, boolean followRedirects) {
        
        Intent existenceCheckIntent = new Intent();
        existenceCheckIntent.setAction(OperationsService.ACTION_EXISTENCE_CHECK);
        existenceCheckIntent.putExtra(OperationsService.EXTRA_SERVER_URL, mHostBaseUrl);
        existenceCheckIntent.putExtra(OperationsService.EXTRA_REMOTE_PATH, remotePath);
        existenceCheckIntent.putExtra(OperationsService.EXTRA_SUCCESS_IF_ABSENT, successIfAbsent);
        existenceCheckIntent.putExtra(OperationsService.EXTRA_WEBDAV_PATH, webdav_path);
        existenceCheckIntent.putExtra(OperationsService.EXTRA_USERNAME, username);
        existenceCheckIntent.putExtra(OperationsService.EXTRA_PASSWORD, password);
        existenceCheckIntent.putExtra(OperationsService.EXTRA_AUTH_TOKEN, mAuthToken);
        existenceCheckIntent.putExtra(OperationsService.EXTRA_FOLLOW_REDIRECTS, followRedirects);
        
        if (mOperationsServiceBinder != null) {
            Log_OC.wtf(TAG, "starting existenceCheckRemoteOperation..." );
            mExistenceCheckOpId = mOperationsServiceBinder.newOperation(existenceCheckIntent);
        }
    }

    /**
     * Starts the OAuth 'grant type' flow to get an access token, with 
     * a GET AUTHORIZATION request to the BUILT-IN authorization server. 
     */
    private void startOauthorization() {
        // be gentle with the user
        mAuthStatusIcon = R.drawable.progress_small;
        mAuthStatusText = R.string.oauth_login_connection;
        showAuthStatus();

        // GET AUTHORIZATION request
        //Uri uri = Uri.parse(getString(R.string.oauth2_url_endpoint_auth));
        Uri uri = Uri.parse(mOAuthAuthEndpointText.getText().toString().trim());
        Uri.Builder uriBuilder = uri.buildUpon();
        uriBuilder.appendQueryParameter(OAuth2Constants.KEY_RESPONSE_TYPE, getString(R.string.oauth2_response_type));
        uriBuilder.appendQueryParameter(OAuth2Constants.KEY_REDIRECT_URI, getString(R.string.oauth2_redirect_uri));   
        uriBuilder.appendQueryParameter(OAuth2Constants.KEY_CLIENT_ID, getString(R.string.oauth2_client_id));
        uriBuilder.appendQueryParameter(OAuth2Constants.KEY_SCOPE, getString(R.string.oauth2_scope));
        //uriBuilder.appendQueryParameter(OAuth2Constants.KEY_STATE, whateverwewant);
        uri = uriBuilder.build();
        Log_OC.d(TAG, "Starting browser to view " + uri.toString());
        Intent i = new Intent(Intent.ACTION_VIEW, uri);
        startActivity(i);
    }


    /**
     * Starts the Web Single Sign On flow to get access to the root folder
     * in the server.
     */
    private void startSamlBasedFederatedSingleSignOnAuthorization() {
        // be gentle with the user
        mAuthStatusIcon = R.drawable.progress_small;
        mAuthStatusText = R.string.auth_connecting_auth_server;
        showAuthStatus();
        IndeterminateProgressDialog dialog = 
                IndeterminateProgressDialog.newInstance(R.string.auth_trying_to_login, true);
        dialog.show(getSupportFragmentManager(), WAIT_DIALOG_TAG);

        /// get the path to the root folder through WebDAV from the version server
        String webdav_path = AccountUtils.getWebdavPath(mDiscoveredVersion, mAuthTokenType);

        /// test credentials accessing the root folder
        String remotePath ="";
        boolean successIfAbsent = false;
        boolean followRedirections = false;
        startExistenceCheckRemoteOperation(remotePath, this, successIfAbsent, webdav_path, "", "", followRedirections);

    }

    /**
     * Callback method invoked when a RemoteOperation executed by this Activity finishes.
     * 
     * Dispatches the operation flow to the right method.
     */
    @Override
    public void onRemoteOperationFinish(RemoteOperation operation, RemoteOperationResult result) {

        if (operation instanceof GetServerInfoOperation) {
            if (operation.hashCode() == mGetServerInfoOpId) {
                onGetServerInfoFinish(result);
            }   // else nothing ; only the last check operation is considered; 
                // multiple can be started if the user amends a URL quickly

        } else if (operation instanceof OAuth2GetAccessToken) {
            onGetOAuthAccessTokenFinish(result);

        } else if (operation instanceof ExistenceCheckRemoteOperation)  {
            Log_OC.wtf(TAG, "received detection response through callback" );
            if (AccountTypeUtils.getAuthTokenTypeSamlSessionCookie(MainApp.getAccountType()).equals(mAuthTokenType)) {
                onSamlBasedFederatedSingleSignOnAuthorizationStart(result);

            } else {
                onAuthorizationCheckFinish(result);
            }
        } else if (operation instanceof GetRemoteUserNameOperation) {
            onGetUserNameFinish(result);
        }

    }

    private void onGetUserNameFinish(RemoteOperationResult result) {
        mGetUserNameOpId = -1;
        if (result.isSuccess()) {
            boolean success = false;
            String username = (String) result.getData().get(0);

            if ( mAction == ACTION_CREATE) {
                mUsernameInput.setText(username);
                success = createAccount();
            } else {

                if (!mUsernameInput.getText().toString().equals(username)) {
                    // fail - not a new account, but an existing one; disallow
                    result = new RemoteOperationResult(ResultCode.ACCOUNT_NOT_THE_SAME); 
                    updateAuthStatusIconAndText(result);
                    showAuthStatus();
                    Log_OC.d(TAG, result.getLogMessage());
                } else {
                    updateToken();
                    success = true;
                }
            }

            if (success)
                finish();
        } else {
            updateStatusIconFailUserName();
            showAuthStatus();
            Log_OC.e(TAG, "Access to user name failed: " + result.getLogMessage());
        }

    }

    private void onSamlBasedFederatedSingleSignOnAuthorizationStart(RemoteOperationResult result) {
        mExistenceCheckOpId = -1;
        dismissDialog(WAIT_DIALOG_TAG);

        //if (result.isTemporalRedirection() && result.isIdPRedirection()) {
        if (result.isIdPRedirection()) {
            String url = result.getRedirectedLocation();
            String targetUrl = mHostBaseUrl + AccountUtils.getWebdavPath(mDiscoveredVersion, mAuthTokenType);

            // Show dialog
            mSamlDialog = SamlWebViewDialog.newInstance(url, targetUrl);            
            mSamlDialog.show(getSupportFragmentManager(), SAML_DIALOG_TAG);

            mAuthStatusIcon = 0;
            mAuthStatusText = 0;

        } else {
            mAuthStatusIcon = R.drawable.common_error;
            mAuthStatusText = R.string.auth_unsupported_auth_method;

        }
        showAuthStatus();
    }


    /**
     * Processes the result of the server check performed when the user finishes the enter of the
     * server URL.
     * 
     * @param operation     Server check performed.
     * @param result        Result of the check.
     */
    private void onGetServerInfoFinish(RemoteOperationResult result) {
        /// update activity state
        mServerIsChecked = true;
        mIsSslConn = (result.getCode() == ResultCode.OK_SSL);
        mServerInfoOperation = null;
        mGetServerInfoOpId = -1;
        
        // update server status, but don't show it yet
        updateServerStatusIconAndText(result);

        if (result.isSuccess()) {
            /// SUCCESS means:
            //      1. connection succeeded, and we know if it's SSL or not
            //      2. server is installed
            //      3. we got the server version
            //      4. we got the authentication method required by the server 
            mServerInfo = (GetServerInfoOperation.ServerInfo) (result.getData().get(0));
            mDiscoveredVersion = mServerInfo.mVersion;
            mHostBaseUrl = mServerInfo.mBaseUrl;
            mServerAuthMethod = mServerInfo.mAuthMethod;
            
            if (!authSupported(mServerAuthMethod)) {
                
                updateServerStatusIconNoRegularAuth();  // overrides updateServerStatusIconAndText()  
                mServerIsValid = false;

            } else {
                mServerIsValid = true;
            }
            
        } else {
            mServerIsValid = false;
        }

        // refresh UI
        showRefreshButton(!mServerIsValid);
        showServerStatus();
        mOkButton.setEnabled(mServerIsValid);
        
        /// very special case (TODO: move to a common place for all the remote operations)
        if (result.getCode() == ResultCode.SSL_RECOVERABLE_PEER_UNVERIFIED) {
            showUntrustedCertDialog(result);
        }
    }


    private boolean authSupported(AuthenticationMethod authMethod) {
        String basic = AccountTypeUtils.getAuthTokenTypePass(MainApp.getAccountType());
        String oAuth = AccountTypeUtils.getAuthTokenTypeAccessToken(MainApp.getAccountType());
        String saml =  AccountTypeUtils.getAuthTokenTypeSamlSessionCookie(MainApp.getAccountType());
        
        return (( mAuthTokenType.equals(basic) && 
                    authMethod.equals(AuthenticationMethod.BASIC_HTTP_AUTH) ) ||
                ( mAuthTokenType.equals(oAuth) && 
                    authMethod.equals(AuthenticationMethod.BEARER_TOKEN)) ||
                ( mAuthTokenType.equals(saml)  && 
                    authMethod.equals(AuthenticationMethod.SAML_WEB_SSO))
        );
    }


    // TODO remove, if possible
    private String normalizeUrl(String url) {
        if (url != null && url.length() > 0) {
            url = url.trim();
            if (!url.toLowerCase().startsWith("http://") &&
                    !url.toLowerCase().startsWith("https://")) {
                if (mIsSslConn) {
                    url = "https://" + url;
                } else {
                    url = "http://" + url;
                }
            }
            
            url = trimUrlWebdav(url);

            if (url.endsWith("/")) {
                url = url.substring(0, url.length() - 1);
            }

        }
        return (url != null ? url : "");
    }


    // TODO remove, if possible
    private String trimUrlWebdav(String url){       
        if(url.toLowerCase().endsWith(AccountUtils.WEBDAV_PATH_4_0)){
            url = url.substring(0, url.length() - AccountUtils.WEBDAV_PATH_4_0.length());             
        } else if(url.toLowerCase().endsWith(AccountUtils.WEBDAV_PATH_2_0)){
            url = url.substring(0, url.length() - AccountUtils.WEBDAV_PATH_2_0.length());             
        } else if (url.toLowerCase().endsWith(AccountUtils.WEBDAV_PATH_1_2)){
            url = url.substring(0, url.length() - AccountUtils.WEBDAV_PATH_1_2.length());             
        } 
        return (url != null ? url : "");
    }


    /**
     * Chooses the right icon and text to show to the user for the received operation result.
     * 
     * @param result    Result of a remote operation performed in this activity
     */
    private void updateServerStatusIconAndText(RemoteOperationResult result) {
        mServerStatusIcon = R.drawable.common_error;    // the most common case in the switch below

        switch (result.getCode()) {
        case OK_SSL:
            mServerStatusIcon = android.R.drawable.ic_secure;
            mServerStatusText = R.string.auth_secure_connection;
            break;

        case OK_NO_SSL:
        case OK:
            if (mHostUrlInput.getText().toString().trim().toLowerCase().startsWith("http://") ) {
                mServerStatusText = R.string.auth_connection_established;
                mServerStatusIcon = R.drawable.ic_ok;
            } else {
                mServerStatusText = R.string.auth_nossl_plain_ok_title;
                mServerStatusIcon = android.R.drawable.ic_partial_secure;
            }
            break;

        case NO_NETWORK_CONNECTION:
            mServerStatusIcon = R.drawable.no_network;
            mServerStatusText = R.string.auth_no_net_conn_title;
            break;

        case SSL_RECOVERABLE_PEER_UNVERIFIED:
            mServerStatusText = R.string.auth_ssl_unverified_server_title;
            break;
        case BAD_OC_VERSION:
            mServerStatusText = R.string.auth_bad_oc_version_title;
            break;
        case WRONG_CONNECTION:
            mServerStatusText = R.string.auth_wrong_connection_title;
            break;
        case TIMEOUT:
            mServerStatusText = R.string.auth_timeout_title;
            break;
        case INCORRECT_ADDRESS:
            mServerStatusText = R.string.auth_incorrect_address_title;
            break;
        case SSL_ERROR:
            mServerStatusText = R.string.auth_ssl_general_error_title;
            break;
        case UNAUTHORIZED:
            mServerStatusText = R.string.auth_unauthorized;
            break;
        case HOST_NOT_AVAILABLE:
            mServerStatusText = R.string.auth_unknown_host_title;
            break;
        case INSTANCE_NOT_CONFIGURED:
            mServerStatusText = R.string.auth_not_configured_title;
            break;
        case FILE_NOT_FOUND:
            mServerStatusText = R.string.auth_incorrect_path_title;
            break;
        case OAUTH2_ERROR:
            mServerStatusText = R.string.auth_oauth_error;
            break;
        case OAUTH2_ERROR_ACCESS_DENIED:
            mServerStatusText = R.string.auth_oauth_error_access_denied;
            break;
        case UNHANDLED_HTTP_CODE:
        case UNKNOWN_ERROR:
            mServerStatusText = R.string.auth_unknown_error_title;
            break;
        default:
            mServerStatusText = 0;
            mServerStatusIcon = 0;
        }
    }


    /**
     * Chooses the right icon and text to show to the user for the received operation result.
     * 
     * @param result    Result of a remote operation performed in this activity
     */
    private void updateAuthStatusIconAndText(RemoteOperationResult result) {
        mAuthStatusIcon = R.drawable.common_error;    // the most common case in the switch below

        switch (result.getCode()) {
        case OK_SSL:
            mAuthStatusIcon = android.R.drawable.ic_secure;
            mAuthStatusText = R.string.auth_secure_connection;
            break;

        case OK_NO_SSL:
        case OK:
            if (mHostUrlInput.getText().toString().trim().toLowerCase().startsWith("http://") ) {
                mAuthStatusText = R.string.auth_connection_established;
                mAuthStatusIcon = R.drawable.ic_ok;
            } else {
                mAuthStatusText = R.string.auth_nossl_plain_ok_title;
                mAuthStatusIcon = android.R.drawable.ic_partial_secure;
            }
            break;

        case NO_NETWORK_CONNECTION:
            mAuthStatusIcon = R.drawable.no_network;
            mAuthStatusText = R.string.auth_no_net_conn_title;
            break;

        case SSL_RECOVERABLE_PEER_UNVERIFIED:
            mAuthStatusText = R.string.auth_ssl_unverified_server_title;
            break;
        case BAD_OC_VERSION:
            mAuthStatusText = R.string.auth_bad_oc_version_title;
            break;
        case WRONG_CONNECTION:
            mAuthStatusText = R.string.auth_wrong_connection_title;
            break;
        case TIMEOUT:
            mAuthStatusText = R.string.auth_timeout_title;
            break;
        case INCORRECT_ADDRESS:
            mAuthStatusText = R.string.auth_incorrect_address_title;
            break;
        case SSL_ERROR:
            mAuthStatusText = R.string.auth_ssl_general_error_title;
            break;
        case UNAUTHORIZED:
            mAuthStatusText = R.string.auth_unauthorized;
            break;
        case HOST_NOT_AVAILABLE:
            mAuthStatusText = R.string.auth_unknown_host_title;
            break;
        case INSTANCE_NOT_CONFIGURED:
            mAuthStatusText = R.string.auth_not_configured_title;
            break;
        case FILE_NOT_FOUND:
            mAuthStatusText = R.string.auth_incorrect_path_title;
            break;
        case OAUTH2_ERROR:
            mAuthStatusText = R.string.auth_oauth_error;
            break;
        case OAUTH2_ERROR_ACCESS_DENIED:
            mAuthStatusText = R.string.auth_oauth_error_access_denied;
            break;
        case ACCOUNT_NOT_NEW:
            mAuthStatusText = R.string.auth_account_not_new;
            break;
        case ACCOUNT_NOT_THE_SAME:
            mAuthStatusText = R.string.auth_account_not_the_same;
            break;
        case UNHANDLED_HTTP_CODE:
        case UNKNOWN_ERROR:
            mAuthStatusText = R.string.auth_unknown_error_title;
            break;
        default:
            mAuthStatusText = 0;
            mAuthStatusIcon = 0;
        }
    }


    private void updateStatusIconFailUserName(){
        mAuthStatusIcon = R.drawable.common_error;
        mAuthStatusText = R.string.auth_fail_get_user_name;
    }

    private void updateServerStatusIconNoRegularAuth(){
        mServerStatusIcon = R.drawable.common_error;
        mServerStatusText = R.string.auth_can_not_auth_against_server;
    }

    /**
     * Processes the result of the request for and access token send 
     * to an OAuth authorization server.
     * 
     * @param result        Result of the operation.
     */
    private void onGetOAuthAccessTokenFinish(RemoteOperationResult result) {
        mOauth2GetAccessTokenOpId = -1;
        dismissDialog(WAIT_DIALOG_TAG);

        String webdav_path = AccountUtils.getWebdavPath(mDiscoveredVersion, mAuthTokenType);
        if (result.isSuccess() && webdav_path != null) {
            /// be gentle with the user
            IndeterminateProgressDialog dialog = 
                    IndeterminateProgressDialog.newInstance(R.string.auth_trying_to_login, true);
            dialog.show(getSupportFragmentManager(), WAIT_DIALOG_TAG);

            /// time to test the retrieved access token on the ownCloud server
            @SuppressWarnings("unchecked")
            Map<String, String> tokens = (Map<String, String>)(result.getData().get(0));
            mAuthToken = tokens.get(OAuth2Constants.KEY_ACCESS_TOKEN);
            //mAuthToken = ((OAuth2GetAccessToken)operation).getResultTokenMap().get(OAuth2Constants.KEY_ACCESS_TOKEN);
            Log_OC.d(TAG, "Got ACCESS TOKEN: " + mAuthToken);
            
            String remotePath ="";
            boolean successIfAbsent = false;
            boolean followRedirects = true;
            startExistenceCheckRemoteOperation(remotePath, this, successIfAbsent, webdav_path, "", "", followRedirects);

        } else {
            updateAuthStatusIconAndText(result);
            showAuthStatus();
            Log_OC.d(TAG, "Access failed: " + result.getLogMessage());
        }
    }


    /**
     * Processes the result of the access check performed to try the user credentials.
     * 
     * Creates a new account through the AccountManager.
     * 
     * @param operation     Access check performed.
     * @param result        Result of the operation.
     */
    private void onAuthorizationCheckFinish(RemoteOperationResult result) {
        mExistenceCheckOpId = -1;
        dismissDialog(WAIT_DIALOG_TAG);

        if (result.isSuccess()) {
            Log_OC.d(TAG, "Successful access - time to save the account");

            boolean success = false;
            if (mAction == ACTION_CREATE) {
                success = createAccount();

            } else {
                updateToken();
                success = true;
            }

            if (success) {
                finish();
            }
            
        } else if (result.isServerFail() || result.isException()) {
            /// if server fail or exception in authorization, the UI is updated as when a server check failed
            mServerIsChecked = true;
            mServerIsValid = false;
            mIsSslConn = false;
            mServerInfoOperation = null;
            mDiscoveredVersion = null;
            mHostBaseUrl = normalizeUrl(mHostUrlInput.getText().toString());

            // update status icon and text
            updateServerStatusIconAndText(result);
            showServerStatus();
            mAuthStatusIcon = 0;
            mAuthStatusText = 0;
            showAuthStatus();

            // update input controls state
            showRefreshButton(true);
            mOkButton.setEnabled(false);

            // very special case (TODO: move to a common place for all the remote operations) (dangerous here?)
            if (result.getCode() == ResultCode.SSL_RECOVERABLE_PEER_UNVERIFIED) {
                showUntrustedCertDialog(result);
            }

        } else {    // authorization fail due to client side - probably wrong credentials
            updateAuthStatusIconAndText(result);
            showAuthStatus();
            Log_OC.d(TAG, "Access failed: " + result.getLogMessage());
        }
    }




    /**
     * Sets the proper response to get that the Account Authenticator that started this activity saves 
     * a new authorization token for mAccount.
     */
    private void updateToken() {
        Bundle response = new Bundle();
        response.putString(AccountManager.KEY_ACCOUNT_NAME, mAccount.name);
        response.putString(AccountManager.KEY_ACCOUNT_TYPE, mAccount.type);

        if (AccountTypeUtils.getAuthTokenTypeAccessToken(MainApp.getAccountType()).equals(mAuthTokenType)) { 
            response.putString(AccountManager.KEY_AUTHTOKEN, mAuthToken);
            // the next line is necessary; by now, notifications are calling directly to the AuthenticatorActivity to update, without AccountManager intervention
            mAccountMgr.setAuthToken(mAccount, mAuthTokenType, mAuthToken);

        } else if (AccountTypeUtils.getAuthTokenTypeSamlSessionCookie(MainApp.getAccountType()).equals(mAuthTokenType)) {

            response.putString(AccountManager.KEY_AUTHTOKEN, mAuthToken);
            // the next line is necessary; by now, notifications are calling directly to the AuthenticatorActivity to update, without AccountManager intervention
            mAccountMgr.setAuthToken(mAccount, mAuthTokenType, mAuthToken);

        } else {
            response.putString(AccountManager.KEY_AUTHTOKEN, mPasswordInput.getText().toString());
            mAccountMgr.setPassword(mAccount, mPasswordInput.getText().toString());
        }
        setAccountAuthenticatorResult(response);

    }


    /**
     * Creates a new account through the Account Authenticator that started this activity. 
     * 
     * This makes the account permanent.
     * 
     * TODO Decide how to name the OAuth accounts
     */
    private boolean createAccount() {
        /// create and save new ownCloud account
        boolean isOAuth = AccountTypeUtils.getAuthTokenTypeAccessToken(MainApp.getAccountType()).equals(mAuthTokenType);
        boolean isSaml =  AccountTypeUtils.getAuthTokenTypeSamlSessionCookie(MainApp.getAccountType()).equals(mAuthTokenType);

        Uri uri = Uri.parse(mHostBaseUrl);
        String username = mUsernameInput.getText().toString().trim();
        if (isOAuth) {
            username = "OAuth_user" + (new java.util.Random(System.currentTimeMillis())).nextLong();
        }            
        String accountName = username + "@" + uri.getHost();
        if (uri.getPort() >= 0) {
            accountName += ":" + uri.getPort();
        }
        mAccount = new Account(accountName, MainApp.getAccountType());
        if (AccountUtils.exists(mAccount, getApplicationContext())) {
            // fail - not a new account, but an existing one; disallow
            RemoteOperationResult result = new RemoteOperationResult(ResultCode.ACCOUNT_NOT_NEW); 
            updateAuthStatusIconAndText(result);
            showAuthStatus();
            Log_OC.d(TAG, result.getLogMessage());
            return false;

        } else {

            if (isOAuth || isSaml) {
                mAccountMgr.addAccountExplicitly(mAccount, "", null);  // with external authorizations, the password is never input in the app
            } else {
                mAccountMgr.addAccountExplicitly(mAccount, mPasswordInput.getText().toString(), null);
            }

            /// add the new account as default in preferences, if there is none already
            Account defaultAccount = AccountUtils.getCurrentOwnCloudAccount(this);
            if (defaultAccount == null) {
                SharedPreferences.Editor editor = PreferenceManager
                        .getDefaultSharedPreferences(this).edit();
                editor.putString("select_oc_account", accountName);
                editor.commit();
            }

            /// prepare result to return to the Authenticator
            //  TODO check again what the Authenticator makes with it; probably has the same effect as addAccountExplicitly, but it's not well done
            final Intent intent = new Intent();       
            intent.putExtra(AccountManager.KEY_ACCOUNT_TYPE,    MainApp.getAccountType());
            intent.putExtra(AccountManager.KEY_ACCOUNT_NAME,    mAccount.name);
            /*if (!isOAuth)
                intent.putExtra(AccountManager.KEY_AUTHTOKEN,   MainApp.getAccountType()); */
            intent.putExtra(AccountManager.KEY_USERDATA,        username);
            if (isOAuth || isSaml) {
                mAccountMgr.setAuthToken(mAccount, mAuthTokenType, mAuthToken);
            }
            /// add user data to the new account; TODO probably can be done in the last parameter addAccountExplicitly, or in KEY_USERDATA
            mAccountMgr.setUserData(mAccount, Constants.KEY_OC_VERSION,         mDiscoveredVersion.getVersion());
            mAccountMgr.setUserData(mAccount, Constants.KEY_OC_BASE_URL,   mHostBaseUrl);

            if (isSaml) {
                mAccountMgr.setUserData(mAccount, Constants.KEY_SUPPORTS_SAML_WEB_SSO, "TRUE"); 
            } else if (isOAuth) {
                mAccountMgr.setUserData(mAccount, Constants.KEY_SUPPORTS_OAUTH2, "TRUE");  
            }

            setAccountAuthenticatorResult(intent.getExtras());
            setResult(RESULT_OK, intent);

            return true;
        }
    }


    /**
     * Starts and activity to open the 'new account' page in the ownCloud web site
     * 
     * @param view      'Account register' button
     */
    public void onRegisterClick(View view) {
        Intent register = new Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.welcome_link_url)));
        setResult(RESULT_CANCELED);
        startActivity(register);
    }


    /**
     * Updates the content and visibility state of the icon and text associated
     * to the last check on the ownCloud server.
     */
    private void showServerStatus() {
        TextView tv = (TextView) findViewById(R.id.server_status_text);

        if (mServerStatusIcon == 0 && mServerStatusText == 0) {
            tv.setVisibility(View.INVISIBLE);

        } else {
            tv.setText(mServerStatusText);
            tv.setCompoundDrawablesWithIntrinsicBounds(mServerStatusIcon, 0, 0, 0);
            tv.setVisibility(View.VISIBLE);
        }

    }


    /**
     * Updates the content and visibility state of the icon and text associated
     * to the interactions with the OAuth authorization server.
     */
    private void showAuthStatus() {
        if (mAuthStatusIcon == 0 && mAuthStatusText == 0) {
            mAuthStatusLayout.setVisibility(View.INVISIBLE);

        } else {
            mAuthStatusLayout.setText(mAuthStatusText);
            mAuthStatusLayout.setCompoundDrawablesWithIntrinsicBounds(mAuthStatusIcon, 0, 0, 0);
            mAuthStatusLayout.setVisibility(View.VISIBLE);
        }
    }     


    private void showRefreshButton (boolean show) {
        if (show)  {
            mRefreshButton.setVisibility(View.VISIBLE);
        } else {
            mRefreshButton.setVisibility(View.GONE);
        }
    }

    /**
     * Called when the refresh button in the input field for ownCloud host is clicked.
     * 
     * Performs a new check on the URL in the input field.
     * 
     * @param view      Refresh 'button'
     */
    public void onRefreshClick(View view) {
        checkOcServer();
    }


    /**
     * Called when the eye icon in the password field is clicked.
     * 
     * Toggles the visibility of the password in the field. 
     */
    public void onViewPasswordClick() {
        int selectionStart = mPasswordInput.getSelectionStart();
        int selectionEnd = mPasswordInput.getSelectionEnd();
        if (isPasswordVisible()) {
            hidePassword();
        } else {
            showPassword();
        }
        mPasswordInput.setSelection(selectionStart, selectionEnd);
    }    


    /**
     * Called when the checkbox for OAuth authorization is clicked.
     * 
     * Hides or shows the input fields for user & password. 
     * 
     * @param view      'View password' 'button'
     */
    public void onCheckClick(View view) {
        CheckBox oAuth2Check = (CheckBox)view;
        if (oAuth2Check.isChecked()) {
            mAuthTokenType = AccountTypeUtils.getAuthTokenTypeAccessToken(MainApp.getAccountType());
        } else {
            mAuthTokenType = AccountTypeUtils.getAuthTokenTypePass(MainApp.getAccountType());
        }
        adaptViewAccordingToAuthenticationMethod();
    }


    /**
     * Changes the visibility of input elements depending on
     * the current authorization method.
     */
    private void adaptViewAccordingToAuthenticationMethod () {
        if (AccountTypeUtils.getAuthTokenTypeAccessToken(MainApp.getAccountType()).equals(mAuthTokenType)) {
            // OAuth 2 authorization
            mOAuthAuthEndpointText.setVisibility(View.VISIBLE);
            mOAuthTokenEndpointText.setVisibility(View.VISIBLE);
            mUsernameInput.setVisibility(View.GONE);
            mPasswordInput.setVisibility(View.GONE);

        } else if (AccountTypeUtils.getAuthTokenTypeSamlSessionCookie(MainApp.getAccountType()).equals(mAuthTokenType)) {
            // SAML-based web Single Sign On
            mOAuthAuthEndpointText.setVisibility(View.GONE);
            mOAuthTokenEndpointText.setVisibility(View.GONE);
            mUsernameInput.setVisibility(View.GONE);
            mPasswordInput.setVisibility(View.GONE);
        } else {
            // basic HTTP authorization
            mOAuthAuthEndpointText.setVisibility(View.GONE);
            mOAuthTokenEndpointText.setVisibility(View.GONE);
            mUsernameInput.setVisibility(View.VISIBLE);
            mPasswordInput.setVisibility(View.VISIBLE);
        }
    }

    /**
     *  Called when the 'action' button in an IME is pressed ('enter' in software keyboard).
     * 
     *  Used to trigger the authentication check when the user presses 'enter' after writing the password, 
     *  or to throw the server test when the only field on screen is the URL input field.
     */
    @Override
    public boolean onEditorAction(TextView inputField, int actionId, KeyEvent event) {
        if (actionId == EditorInfo.IME_ACTION_DONE && inputField != null && inputField.equals(mPasswordInput)) {
            if (mOkButton.isEnabled()) {
                mOkButton.performClick();
            }

        } else if (actionId == EditorInfo.IME_ACTION_NEXT && inputField != null && inputField.equals(mHostUrlInput)) {
            if (AccountTypeUtils.getAuthTokenTypeSamlSessionCookie(MainApp.getAccountType()).equals(mAuthTokenType)) {
                checkOcServer();
            }
        }
        return false;   // always return false to grant that the software keyboard is hidden anyway
    }


    private abstract static class RightDrawableOnTouchListener implements OnTouchListener  {

        private int fuzz = 75;

        /**
         * {@inheritDoc}
         */
        @Override
        public boolean onTouch(View view, MotionEvent event) {
            Drawable rightDrawable = null;
            if (view instanceof TextView) {
                Drawable[] drawables = ((TextView)view).getCompoundDrawables();
                if (drawables.length > 2) {
                    rightDrawable = drawables[2];
                }
            }
            if (rightDrawable != null) {
                final int x = (int) event.getX();
                final int y = (int) event.getY();
                final Rect bounds = rightDrawable.getBounds();
                if (x >= (view.getRight() - bounds.width() - fuzz) && x <= (view.getRight() - view.getPaddingRight() + fuzz)
                        && y >= (view.getPaddingTop() - fuzz) && y <= (view.getHeight() - view.getPaddingBottom()) + fuzz) {

                    return onDrawableTouch(event);
                }
            }
            return false;
        }

        public abstract boolean onDrawableTouch(final MotionEvent event);
    }


    public void onSamlDialogSuccess(String sessionCookie) {
        mAuthToken = sessionCookie;

        if (sessionCookie != null && sessionCookie.length() > 0) {
            mAuthToken = sessionCookie;
            boolean followRedirects = true;
            getRemoteUserNameOperation(sessionCookie, followRedirects);
        }
    }
    
    private void getRemoteUserNameOperation(String sessionCookie, boolean followRedirects) {
        
        Intent getUserNameIntent = new Intent();
        getUserNameIntent.setAction(OperationsService.ACTION_GET_USER_NAME);
        getUserNameIntent.putExtra(OperationsService.EXTRA_SERVER_URL, mHostBaseUrl);
        getUserNameIntent.putExtra(OperationsService.EXTRA_COOKIE, sessionCookie);
        getUserNameIntent.putExtra(OperationsService.EXTRA_FOLLOW_REDIRECTS, followRedirects);
        
        if (mOperationsServiceBinder != null) {
            //Log_OC.wtf(TAG, "starting getRemoteUserNameOperation..." );
            mGetUserNameOpId = mOperationsServiceBinder.newOperation(getUserNameIntent);
        }
    }


    @Override
    public void onSsoFinished(String sessionCookies) {
        if (sessionCookies != null && sessionCookies.length() > 0) {
            Log_OC.d(TAG, "Successful SSO - time to save the account");
            onSamlDialogSuccess(sessionCookies);
            Fragment fd = getSupportFragmentManager().findFragmentByTag(SAML_DIALOG_TAG);
            if (fd != null && fd instanceof SherlockDialogFragment) {
                Dialog d = ((SherlockDialogFragment)fd).getDialog();
                if (d != null && d.isShowing()) {
                    d.dismiss();
                }
            }

        } else { 
            // TODO - show fail
            Log_OC.d(TAG, "SSO failed");
        }

    }

    /** Show auth_message 
     * 
     * @param message
     */
    private void showAuthMessage(String message) {
        mAuthMessage.setVisibility(View.VISIBLE);
        mAuthMessage.setText(message);
    }

    private void hideAuthMessage() {
        mAuthMessage.setVisibility(View.GONE);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (AccountTypeUtils.getAuthTokenTypeSamlSessionCookie(MainApp.getAccountType()).equals(mAuthTokenType) &&
                mHostUrlInput.hasFocus() && event.getAction() == MotionEvent.ACTION_DOWN) {
            checkOcServer();
        }
        return super.onTouchEvent(event);
    }


    /**
     * Show untrusted cert dialog 
     */
    public void showUntrustedCertDialog(X509Certificate x509Certificate, SslError error, SslErrorHandler handler) {
        // Show a dialog with the certificate info
        SslUntrustedCertDialog dialog = null;
        if (x509Certificate == null) {
            dialog = SslUntrustedCertDialog.newInstanceForEmptySslError(error, handler);
        } else {
            dialog = SslUntrustedCertDialog.newInstanceForFullSslError(x509Certificate, error, handler);
        }
        FragmentManager fm = getSupportFragmentManager();
        FragmentTransaction ft = fm.beginTransaction();
        ft.addToBackStack(null);
        dialog.show(ft, DIALOG_UNTRUSTED_CERT);
    }

    /**
     * Show untrusted cert dialog 
     */
    public void showUntrustedCertDialog(RemoteOperationResult result) {
        // Show a dialog with the certificate info
        SslUntrustedCertDialog dialog = SslUntrustedCertDialog.newInstanceForFullSslError((CertificateCombinedException)result.getException());
        FragmentManager fm = getSupportFragmentManager();
        FragmentTransaction ft = fm.beginTransaction();
        ft.addToBackStack(null);
        dialog.show(ft, DIALOG_UNTRUSTED_CERT);

    }

    /**
     * Called from SslValidatorDialog when a new server certificate was correctly saved.
     */
    public void onSavedCertificate() {
        Fragment fd = getSupportFragmentManager().findFragmentByTag(SAML_DIALOG_TAG);
        if (fd == null) {
            // if SAML dialog is not shown, the SslDialog was shown due to an SSL error in the server check
            checkOcServer();
        }
    }

    /**
     * Called from SslValidatorDialog when a new server certificate could not be saved 
     * when the user requested it.
     */
    @Override
    public void onFailedSavingCertificate() {
        dismissDialog(SAML_DIALOG_TAG);
        Toast.makeText(this, R.string.ssl_validator_not_saved, Toast.LENGTH_LONG).show();
    }

    @Override
    public void onCancelCertificate() {
        dismissDialog(SAML_DIALOG_TAG);
    }


    private void doOnResumeAndBound() {
        //Log.wtf(TAG, "registering to listen for operation callbacks" );
        mOperationsServiceBinder.addOperationListener(AuthenticatorActivity.this, mHandler);
        
        if (mGetServerInfoOpId != -1) {
            RemoteOperationResult result = 
                    mOperationsServiceBinder.getOperationResultIfFinished(mGetServerInfoOpId);
            if (result != null) {
                //Log_OC.wtf(TAG, "found result of operation finished while rotating");
                onGetServerInfoFinish(result);
            }
            
        } else if (mOauth2GetAccessTokenOpId != -1) {
            RemoteOperationResult result = 
                    mOperationsServiceBinder.getOperationResultIfFinished(
                            mOauth2GetAccessTokenOpId);
            if (result != null) {
                //Log_OC.wtf(TAG, "found result of operation finished while rotating");
                onGetOAuthAccessTokenFinish(result);
            }
            
        } else if (mExistenceCheckOpId != -1) {
            RemoteOperationResult result = 
                    mOperationsServiceBinder.getOperationResultIfFinished(mExistenceCheckOpId);
            if (result != null) {
                //Log_OC.wtf(TAG, "found result of operation finished while rotating");
                if (AccountTypeUtils.getAuthTokenTypeSamlSessionCookie(
                        MainApp.getAccountType()).equals(mAuthTokenType)) {
                    onSamlBasedFederatedSingleSignOnAuthorizationStart(result);

                } else {
                    onAuthorizationCheckFinish(result);
                }
            }
        }if (mGetUserNameOpId != -1) {
            RemoteOperationResult result = 
                    mOperationsServiceBinder.getOperationResultIfFinished(mGetUserNameOpId);
            if (result != null) {
                //Log_OC.wtf(TAG, "found result of operation finished while rotating");
                onGetUserNameFinish(result);
            }
            
        } 
        
    }

    
    private void dismissDialog(String dialogTag){
        Fragment frag = getSupportFragmentManager().findFragmentByTag(dialogTag);
        if (frag != null && frag instanceof SherlockDialogFragment) {
            SherlockDialogFragment dialog = (SherlockDialogFragment) frag;
            dialog.dismiss();
        }
    }
    
    
    /** 
     * Implements callback methods for service binding. 
     */
    private class OperationsServiceConnection implements ServiceConnection {

        @Override
        public void onServiceConnected(ComponentName component, IBinder service) {
            if (component.equals(new ComponentName(AuthenticatorActivity.this, OperationsService.class))) {
                //Log_OC.wtf(TAG, "Operations service connected");
                mOperationsServiceBinder = (OperationsServiceBinder) service;
                
                doOnResumeAndBound();
                
            } else {
                return;
            }
            
        }

        @Override
        public void onServiceDisconnected(ComponentName component) {
            if (component.equals(new ComponentName(AuthenticatorActivity.this, OperationsService.class))) {
                Log_OC.e(TAG, "Operations service crashed");
                mOperationsServiceBinder = null;
            }
        }
    
    }
    
}