SignInActivity.java

/*
 *				Twidere - Twitter client for Android
 * 
 * Copyright (C) 2012 Mariotaku Lee <mariotaku.lee@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 org.mariotaku.twidere.activity.support;

import static android.text.TextUtils.isEmpty;
import static org.mariotaku.twidere.util.ContentValuesCreator.makeAccountContentValues;
import static org.mariotaku.twidere.util.Utils.getActivatedAccountIds;
import static org.mariotaku.twidere.util.Utils.getNonEmptyString;
import static org.mariotaku.twidere.util.Utils.isUserLoggedIn;
import static org.mariotaku.twidere.util.Utils.setUserAgent;
import static org.mariotaku.twidere.util.Utils.showErrorMessage;
import static org.mariotaku.twidere.util.Utils.trim;

import android.app.AlertDialog;
import android.app.Dialog;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.LinearLayout;

import de.keyboardsurfer.android.widget.crouton.Crouton;
import de.keyboardsurfer.android.widget.crouton.CroutonLifecycleCallback;
import de.keyboardsurfer.android.widget.crouton.CroutonStyle;

import org.mariotaku.twidere.R;
import org.mariotaku.twidere.activity.SettingsActivity;
import org.mariotaku.twidere.app.TwidereApplication;
import org.mariotaku.twidere.fragment.support.BaseSupportDialogFragment;
import org.mariotaku.twidere.provider.TweetStore.Accounts;
import org.mariotaku.twidere.task.AsyncTask;
import org.mariotaku.twidere.util.ColorAnalyser;
import org.mariotaku.twidere.util.OAuthPasswordAuthenticator;
import org.mariotaku.twidere.util.OAuthPasswordAuthenticator.AuthenticationException;
import org.mariotaku.twidere.util.OAuthPasswordAuthenticator.AuthenticityTokenException;
import org.mariotaku.twidere.util.OAuthPasswordAuthenticator.WrongUserPassException;
import org.mariotaku.twidere.util.ParseUtils;
import org.mariotaku.twidere.util.ThemeUtils;
import org.mariotaku.twidere.util.net.HttpClientImpl;
import org.mariotaku.twidere.view.ColorPickerView;

import twitter4j.Twitter;
import twitter4j.TwitterConstants;
import twitter4j.TwitterException;
import twitter4j.TwitterFactory;
import twitter4j.User;
import twitter4j.auth.AccessToken;
import twitter4j.auth.BasicAuthorization;
import twitter4j.auth.RequestToken;
import twitter4j.auth.TwipOModeAuthorization;
import twitter4j.conf.Configuration;
import twitter4j.conf.ConfigurationBuilder;
import twitter4j.http.HttpClientWrapper;
import twitter4j.http.HttpResponse;

public class SignInActivity extends BaseSupportActivity implements TwitterConstants, OnClickListener, TextWatcher,
		CroutonLifecycleCallback {

	private static final String TWITTER_SIGNUP_URL = "https://twitter.com/signup";
	private static final String EXTRA_API_LAST_CHANGE = "api_last_change";

	private String mRestBaseURL, mSigningRestBaseURL;
	private String mOAuthBaseURL, mSigningOAuthBaseURL;
	private String mConsumerKey, mConsumerSecret;
	private String mUsername, mPassword;
	private int mAuthType;
	private Integer mUserColor;
	private long mLoggedId;
	private boolean mBackPressed;
	private long mAPIChangeTimestamp;

	private EditText mEditUsername, mEditPassword;
	private Button mSignInButton, mSignUpButton;
	private LinearLayout mSigninSignupContainer, mUsernamePasswordContainer;
	private ImageButton mSetColorButton;

	private TwidereApplication mApplication;
	private SharedPreferences mPreferences;
	private ContentResolver mResolver;
	private AbstractSignInTask mTask;

	@Override
	public void afterTextChanged(final Editable s) {

	}

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

	}

	@Override
	public void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
		switch (requestCode) {
			case REQUEST_EDIT_API: {
				if (resultCode == RESULT_OK) {
					mRestBaseURL = data.getStringExtra(Accounts.REST_BASE_URL);
					mSigningRestBaseURL = data.getStringExtra(Accounts.SIGNING_REST_BASE_URL);
					mOAuthBaseURL = data.getStringExtra(Accounts.OAUTH_BASE_URL);
					mSigningOAuthBaseURL = data.getStringExtra(Accounts.SIGNING_OAUTH_BASE_URL);
					mAuthType = data.getIntExtra(Accounts.AUTH_TYPE, Accounts.AUTH_TYPE_OAUTH);
					mConsumerKey = data.getStringExtra(Accounts.CONSUMER_KEY);
					mConsumerSecret = data.getStringExtra(Accounts.CONSUMER_SECRET);
					final boolean is_twip_o_mode = mAuthType == Accounts.AUTH_TYPE_TWIP_O_MODE;
					mUsernamePasswordContainer.setVisibility(is_twip_o_mode ? View.GONE : View.VISIBLE);
					mSigninSignupContainer.setOrientation(is_twip_o_mode ? LinearLayout.VERTICAL
							: LinearLayout.HORIZONTAL);
				}
				setSignInButton();
				invalidateOptionsMenu();
				break;
			}
			case REQUEST_SET_COLOR: {
				if (resultCode == BaseSupportActivity.RESULT_OK) {
					mUserColor = data != null ? data.getIntExtra(EXTRA_COLOR, Color.TRANSPARENT) : null;
				} else if (resultCode == ColorPickerDialogActivity.RESULT_CLEARED) {
					mUserColor = null;
				}
				setUserColorButton();
				break;
			}
			case REQUEST_BROWSER_SIGN_IN: {
				if (resultCode == BaseSupportActivity.RESULT_OK && data != null) {
					doLogin(data);
				}
				break;
			}
		}
		super.onActivityResult(requestCode, resultCode, data);
	}

	@Override
	public void onBackPressed() {
		if (mTask != null && mTask.getStatus() == AsyncTask.Status.RUNNING && !mBackPressed) {
			final CroutonStyle.Builder builder = new CroutonStyle.Builder(CroutonStyle.INFO);
			final Crouton crouton = Crouton.makeText(this, R.string.signing_in_please_wait, builder.build());
			crouton.setLifecycleCallback(this);
			crouton.show();
			return;
		}
		if (mTask != null && mTask.getStatus() == AsyncTask.Status.RUNNING) {
			mTask.cancel(false);
		}
		super.onBackPressed();
	}

	@Override
	public void onClick(final View v) {
		switch (v.getId()) {
			case R.id.sign_up: {
				final Intent intent = new Intent(Intent.ACTION_VIEW).setData(Uri.parse(TWITTER_SIGNUP_URL));
				startActivity(intent);
				break;
			}
			case R.id.sign_in: {
				doLogin();
				break;
			}
			case R.id.set_color: {
				final Intent intent = new Intent(this, ColorPickerDialogActivity.class);
				if (mUserColor != null) {
					intent.putExtra(EXTRA_COLOR, mUserColor);
				}
				intent.putExtra(EXTRA_ALPHA_SLIDER, false);
				intent.putExtra(EXTRA_CLEAR_BUTTON, true);
				startActivityForResult(intent, REQUEST_SET_COLOR);
				break;
			}
			case R.id.sign_in_method_introduction: {
				new SignInMethodIntroductionDialogFragment().show(getSupportFragmentManager(),
						"sign_in_method_introduction");
				break;
			}
		}
	}

	@Override
	public void onContentChanged() {
		super.onContentChanged();
		mEditUsername = (EditText) findViewById(R.id.username);
		mEditPassword = (EditText) findViewById(R.id.password);
		mSignInButton = (Button) findViewById(R.id.sign_in);
		mSignUpButton = (Button) findViewById(R.id.sign_up);
		mSigninSignupContainer = (LinearLayout) findViewById(R.id.sign_in_sign_up);
		mUsernamePasswordContainer = (LinearLayout) findViewById(R.id.username_password);
		mSetColorButton = (ImageButton) findViewById(R.id.set_color);
	}

	@Override
	public boolean onCreateOptionsMenu(final Menu menu) {
		getMenuInflater().inflate(R.menu.menu_sign_in, menu);
		return super.onCreateOptionsMenu(menu);
	}

	@Override
	public void onDestroy() {
		getLoaderManager().destroyLoader(0);
		super.onDestroy();
	}

	@Override
	public void onDisplayed() {
		mBackPressed = true;
	}

	@Override
	public boolean onOptionsItemSelected(final MenuItem item) {
		switch (item.getItemId()) {
			case MENU_HOME: {
				final long[] account_ids = getActivatedAccountIds(this);
				if (account_ids.length > 0) {
					onBackPressed();
				}
				break;
			}
			case MENU_SETTINGS: {
				final Intent intent = new Intent(this, SettingsActivity.class);
				startActivity(intent);
				break;
			}
			case MENU_EDIT_API: {
				if (mTask != null && mTask.getStatus() == AsyncTask.Status.RUNNING) return false;
				setDefaultAPI();
				final Intent intent = new Intent(this, APIEditorActivity.class);
				intent.putExtra(Accounts.REST_BASE_URL, mRestBaseURL);
				intent.putExtra(Accounts.SIGNING_REST_BASE_URL, mSigningRestBaseURL);
				intent.putExtra(Accounts.OAUTH_BASE_URL, mOAuthBaseURL);
				intent.putExtra(Accounts.SIGNING_OAUTH_BASE_URL, mSigningOAuthBaseURL);
				intent.putExtra(Accounts.CONSUMER_KEY, mConsumerKey);
				intent.putExtra(Accounts.CONSUMER_SECRET, mConsumerSecret);
				intent.putExtra(Accounts.AUTH_TYPE, mAuthType);
				startActivityForResult(intent, REQUEST_EDIT_API);
				break;
			}
			case MENU_OPEN_IN_BROWSER: {
				if (mAuthType != Accounts.AUTH_TYPE_OAUTH || mTask != null
						&& mTask.getStatus() == AsyncTask.Status.RUNNING) return false;
				saveEditedText();
				final Intent intent = new Intent(this, BrowserSignInActivity.class);
				intent.putExtra(Accounts.CONSUMER_KEY, mConsumerKey);
				intent.putExtra(Accounts.CONSUMER_SECRET, mConsumerSecret);
				startActivityForResult(intent, REQUEST_BROWSER_SIGN_IN);
				break;
			}
		}
		return super.onOptionsItemSelected(item);
	}

	@Override
	public boolean onPrepareOptionsMenu(final Menu menu) {
		final MenuItem itemBrowser = menu.findItem(MENU_OPEN_IN_BROWSER);
		if (itemBrowser != null) {
			final boolean is_oauth = mAuthType == Accounts.AUTH_TYPE_OAUTH;
			itemBrowser.setVisible(is_oauth);
			itemBrowser.setEnabled(is_oauth);
		}
		return super.onPrepareOptionsMenu(menu);
	}

	@Override
	public void onRemoved() {
		mBackPressed = false;
	}

	@Override
	public void onSaveInstanceState(final Bundle outState) {
		saveEditedText();
		setDefaultAPI();
		outState.putString(Accounts.REST_BASE_URL, mRestBaseURL);
		outState.putString(Accounts.OAUTH_BASE_URL, mOAuthBaseURL);
		outState.putString(Accounts.SIGNING_REST_BASE_URL, mSigningRestBaseURL);
		outState.putString(Accounts.SIGNING_OAUTH_BASE_URL, mSigningOAuthBaseURL);
		outState.putString(Accounts.CONSUMER_KEY, mConsumerKey);
		outState.putString(Accounts.CONSUMER_SECRET, mConsumerSecret);
		outState.putString(Accounts.SCREEN_NAME, mUsername);
		outState.putString(Accounts.PASSWORD, mPassword);
		outState.putInt(Accounts.AUTH_TYPE, mAuthType);
		outState.putLong(EXTRA_API_LAST_CHANGE, mAPIChangeTimestamp);
		if (mUserColor != null) {
			outState.putInt(Accounts.COLOR, mUserColor);
		}
		super.onSaveInstanceState(outState);
	}

	@Override
	public void onTextChanged(final CharSequence s, final int start, final int before, final int count) {
		setSignInButton();
	}

	@Override
	protected void onCreate(final Bundle savedInstanceState) {
		requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
		super.onCreate(savedInstanceState);
		mPreferences = getSharedPreferences(SHARED_PREFERENCES_NAME, MODE_PRIVATE);
		mResolver = getContentResolver();
		mApplication = TwidereApplication.getInstance(this);
		setContentView(R.layout.sign_in);
		setProgressBarIndeterminateVisibility(false);
		final long[] account_ids = getActivatedAccountIds(this);
		getActionBar().setDisplayHomeAsUpEnabled(account_ids.length > 0);

		if (savedInstanceState != null) {
			mRestBaseURL = savedInstanceState.getString(Accounts.REST_BASE_URL);
			mOAuthBaseURL = savedInstanceState.getString(Accounts.OAUTH_BASE_URL);
			mSigningRestBaseURL = savedInstanceState.getString(Accounts.SIGNING_REST_BASE_URL);
			mSigningOAuthBaseURL = savedInstanceState.getString(Accounts.SIGNING_OAUTH_BASE_URL);
			mConsumerKey = trim(savedInstanceState.getString(Accounts.CONSUMER_KEY));
			mConsumerSecret = trim(savedInstanceState.getString(Accounts.CONSUMER_SECRET));
			mUsername = savedInstanceState.getString(Accounts.SCREEN_NAME);
			mPassword = savedInstanceState.getString(Accounts.PASSWORD);
			mAuthType = savedInstanceState.getInt(Accounts.AUTH_TYPE);
			if (savedInstanceState.containsKey(Accounts.COLOR)) {
				mUserColor = savedInstanceState.getInt(Accounts.COLOR, Color.TRANSPARENT);
			}
			mAPIChangeTimestamp = savedInstanceState.getLong(EXTRA_API_LAST_CHANGE);
		}

		mUsernamePasswordContainer
				.setVisibility(mAuthType == Accounts.AUTH_TYPE_TWIP_O_MODE ? View.GONE : View.VISIBLE);
		mSigninSignupContainer.setOrientation(mAuthType == Accounts.AUTH_TYPE_TWIP_O_MODE ? LinearLayout.VERTICAL
				: LinearLayout.HORIZONTAL);

		mEditUsername.setText(mUsername);
		mEditUsername.addTextChangedListener(this);
		mEditPassword.setText(mPassword);
		mEditPassword.addTextChangedListener(this);
		setSignInButton();
		setUserColorButton();
	}

	private void doLogin() {
		if (mTask != null && mTask.getStatus() == AsyncTask.Status.RUNNING) {
			mTask.cancel(true);
		}
		saveEditedText();
		setDefaultAPI();
		final Configuration conf = getConfiguration();
		mTask = new SignInTask(this, conf, mUsername, mPassword, mAuthType, mUserColor);
		mTask.execute();
	}

	private void doLogin(final Intent intent) {
		if (intent == null) return;
		if (mTask != null && mTask.getStatus() == AsyncTask.Status.RUNNING) {
			mTask.cancel(true);
		}
		saveEditedText();
		setDefaultAPI();
		final Configuration conf = getConfiguration();
		final String token = intent.getStringExtra(EXTRA_REQUEST_TOKEN);
		final String secret = intent.getStringExtra(EXTRA_REQUEST_TOKEN_SECRET);
		final String verifier = intent.getStringExtra(EXTRA_OAUTH_VERIFIER);
		mTask = new BrowserSignInTask(this, conf, token, secret, verifier, mUserColor);
		mTask.execute();
	}

	private Configuration getConfiguration() {
		final ConfigurationBuilder cb = new ConfigurationBuilder();
		final boolean enable_gzip_compressing = mPreferences.getBoolean(PREFERENCE_KEY_GZIP_COMPRESSING, false);
		final boolean ignore_ssl_error = mPreferences.getBoolean(PREFERENCE_KEY_IGNORE_SSL_ERROR, false);
		final boolean enable_proxy = mPreferences.getBoolean(PREFERENCE_KEY_ENABLE_PROXY, false);
		cb.setHostAddressResolver(mApplication.getHostAddressResolver());
		cb.setHttpClientImplementation(HttpClientImpl.class);
		setUserAgent(this, cb);
		if (!isEmpty(mRestBaseURL)) {
			cb.setRestBaseURL(mRestBaseURL);
		}
		if (!isEmpty(mOAuthBaseURL)) {
			cb.setOAuthBaseURL(mOAuthBaseURL);
		}
		if (!isEmpty(mSigningRestBaseURL)) {
			cb.setSigningRestBaseURL(mSigningRestBaseURL);
		}
		if (!isEmpty(mSigningOAuthBaseURL)) {
			cb.setSigningOAuthBaseURL(mSigningOAuthBaseURL);
		}
		if (isEmpty(mConsumerKey) || isEmpty(mConsumerSecret)) {
			cb.setOAuthConsumerKey(TWITTER_CONSUMER_KEY_2);
			cb.setOAuthConsumerSecret(TWITTER_CONSUMER_SECRET_2);
		} else {
			cb.setOAuthConsumerKey(mConsumerKey);
			cb.setOAuthConsumerSecret(mConsumerSecret);
		}
		cb.setGZIPEnabled(enable_gzip_compressing);
		cb.setIgnoreSSLError(ignore_ssl_error);
		if (enable_proxy) {
			final String proxy_host = mPreferences.getString(PREFERENCE_KEY_PROXY_HOST, null);
			final int proxy_port = ParseUtils.parseInt(mPreferences.getString(PREFERENCE_KEY_PROXY_PORT, "-1"));
			if (!isEmpty(proxy_host) && proxy_port > 0) {
				cb.setHttpProxyHost(proxy_host);
				cb.setHttpProxyPort(proxy_port);
			}
		}
		return cb.build();
	}

	private void saveEditedText() {
		mUsername = ParseUtils.parseString(mEditUsername.getText());
		mPassword = ParseUtils.parseString(mEditPassword.getText());
	}

	private void setDefaultAPI() {
		final long api_last_change = mPreferences.getLong(PREFERENCE_KEY_API_LAST_CHANGE, mAPIChangeTimestamp);
		final boolean default_api_changed = api_last_change != mAPIChangeTimestamp;
		final String consumer_key = getNonEmptyString(mPreferences, PREFERENCE_KEY_CONSUMER_KEY, TWITTER_CONSUMER_KEY_2);
		final String consumer_secret = getNonEmptyString(mPreferences, PREFERENCE_KEY_CONSUMER_SECRET,
				TWITTER_CONSUMER_SECRET_2);
		final String rest_base_url = getNonEmptyString(mPreferences, PREFERENCE_KEY_REST_BASE_URL,
				DEFAULT_REST_BASE_URL);
		final String oauth_base_url = getNonEmptyString(mPreferences, PREFERENCE_KEY_OAUTH_BASE_URL,
				DEFAULT_OAUTH_BASE_URL);
		final String signing_rest_base_url = getNonEmptyString(mPreferences, PREFERENCE_KEY_SIGNING_REST_BASE_URL,
				DEFAULT_SIGNING_REST_BASE_URL);
		final String signing_oauth_base_url = getNonEmptyString(mPreferences, PREFERENCE_KEY_SIGNING_OAUTH_BASE_URL,
				DEFAULT_SIGNING_OAUTH_BASE_URL);
		final int auth_type = mPreferences.getInt(PREFERENCE_KEY_AUTH_TYPE, Accounts.AUTH_TYPE_OAUTH);
		if (isEmpty(mConsumerKey) || default_api_changed) {
			mConsumerKey = consumer_key;
		}
		if (isEmpty(mConsumerSecret) || default_api_changed) {
			mConsumerSecret = consumer_secret;
		}
		if (isEmpty(mRestBaseURL) || default_api_changed) {
			mRestBaseURL = rest_base_url;
		}
		if (isEmpty(mOAuthBaseURL) || default_api_changed) {
			mOAuthBaseURL = oauth_base_url;
		}
		if (isEmpty(mSigningRestBaseURL) || default_api_changed) {
			mSigningRestBaseURL = signing_rest_base_url;
		}
		if (isEmpty(mSigningOAuthBaseURL) || default_api_changed) {
			mSigningOAuthBaseURL = signing_oauth_base_url;
		}
		if (mAuthType == 0 || default_api_changed) {
			mAuthType = auth_type;
		}
		if (default_api_changed) {
			mAPIChangeTimestamp = api_last_change;
		}
	}

	private void setSignInButton() {
		mSignInButton.setEnabled(mEditPassword.getText().length() > 0 && mEditUsername.getText().length() > 0
				|| mAuthType == Accounts.AUTH_TYPE_TWIP_O_MODE);
	}

	private void setUserColorButton() {
		if (mUserColor != null) {
			mSetColorButton.setImageBitmap(ColorPickerView.getColorPreviewBitmap(this, mUserColor));
		} else {
			mSetColorButton.setImageResource(R.drawable.ic_menu_color_palette);
		}
	}

	void onSignInResult(final SignInActivity.SigninResponse result) {
		if (result != null) {
			if (result.succeed) {
				final ContentValues values = makeAccountContentValues(result.conf, result.basic_password,
						result.access_token, result.user, result.auth_type, result.color);
				if (values != null) {
					mResolver.insert(Accounts.CONTENT_URI, values);
				}
				mLoggedId = result.user.getId();
				final Intent intent = new Intent(this, HomeActivity.class);
				final Bundle bundle = new Bundle();
				bundle.putLongArray(EXTRA_IDS, new long[] { mLoggedId });
				intent.putExtras(bundle);
				intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
				startActivity(intent);
				finish();
			} else if (result.already_logged_in) {
				Crouton.makeText(this, R.string.error_already_logged_in, CroutonStyle.ALERT).show();
			} else {
				if (result.exception instanceof AuthenticityTokenException) {
					Crouton.makeText(this, R.string.wrong_api_key, CroutonStyle.ALERT).show();
				} else if (result.exception instanceof WrongUserPassException) {
					Crouton.makeText(this, R.string.wrong_username_password, CroutonStyle.ALERT).show();
				} else if (result.exception instanceof AuthenticationException) {
					showErrorMessage(this, getString(R.string.action_signing_in), result.exception.getCause(), true);
				} else {
					showErrorMessage(this, getString(R.string.action_signing_in), result.exception, true);
				}
			}
		}
		setProgressBarIndeterminateVisibility(false);
		mEditPassword.setEnabled(true);
		mEditUsername.setEnabled(true);
		mSignInButton.setEnabled(true);
		mSignUpButton.setEnabled(true);
		mSetColorButton.setEnabled(true);
		setSignInButton();
	}

	void onSignInStart() {
		setProgressBarIndeterminateVisibility(true);
		mEditPassword.setEnabled(false);
		mEditUsername.setEnabled(false);
		mSignInButton.setEnabled(false);
		mSignUpButton.setEnabled(false);
		mSetColorButton.setEnabled(false);
	}

	public static abstract class AbstractSignInTask extends AsyncTask<Void, Void, SigninResponse> {

		protected final Configuration conf;
		protected final SignInActivity callback;

		public AbstractSignInTask(final SignInActivity callback, final Configuration conf) {
			this.conf = conf;
			this.callback = callback;
		}

		@Override
		protected void onPostExecute(final SigninResponse result) {
			if (callback != null) {
				callback.onSignInResult(result);
			}
		}

		@Override
		protected void onPreExecute() {
			if (callback != null) {
				callback.onSignInStart();
			}
		}

		int analyseUserProfileColor(final User user) throws TwitterException {
			final HttpClientWrapper client = new HttpClientWrapper(conf);
			final String profile_image_url = user != null ? ParseUtils.parseString(user.getProfileImageUrlHttps())
					: null;
			final HttpResponse conn = profile_image_url != null ? client.get(profile_image_url, null) : null;
			final Bitmap bm = conn != null ? BitmapFactory.decodeStream(conn.asStream()) : null;
			if (bm == null) throw new TwitterException("Can't get profile image");
			return ColorAnalyser.analyse(bm);
		}

	}

	public static class BrowserSignInTask extends AbstractSignInTask {

		private final Configuration conf;
		private final String request_token, request_token_secret, oauth_verifier;
		private final Integer user_color;

		private final Context context;

		public BrowserSignInTask(final SignInActivity context, final Configuration conf, final String request_token,
				final String request_token_secret, final String oauth_verifier, final Integer user_color) {
			super(context, conf);
			this.context = context;
			this.conf = conf;
			this.request_token = request_token;
			this.request_token_secret = request_token_secret;
			this.oauth_verifier = oauth_verifier;
			this.user_color = user_color;
		}

		@Override
		protected SigninResponse doInBackground(final Void... params) {
			try {
				final Twitter twitter = new TwitterFactory(conf).getInstance();
				final AccessToken access_token = twitter.getOAuthAccessToken(new RequestToken(conf, request_token,
						request_token_secret), oauth_verifier);
				final long user_id = access_token.getUserId();
				if (user_id <= 0) return new SigninResponse(false, false, null);
				final User user = twitter.showUser(user_id);
				if (isUserLoggedIn(context, user_id)) return new SigninResponse(true, false, null);
				final int color = user_color != null ? user_color : analyseUserProfileColor(user);
				return new SigninResponse(false, true, null, conf, null, access_token, user, Accounts.AUTH_TYPE_OAUTH,
						color);
			} catch (final TwitterException e) {
				return new SigninResponse(false, false, e);
			}
		}
	}

	public static class SignInMethodIntroductionDialogFragment extends BaseSupportDialogFragment {

		@Override
		public Dialog onCreateDialog(final Bundle savedInstanceState) {
			final Context wrapped = ThemeUtils.getDialogThemedContext(getActivity());
			final AlertDialog.Builder builder = new AlertDialog.Builder(wrapped);
			builder.setTitle(R.string.sign_in_method_introduction_title);
			builder.setMessage(R.string.sign_in_method_introduction);
			builder.setPositiveButton(android.R.string.ok, null);
			return builder.create();
		}

	}

	public static class SignInTask extends AbstractSignInTask {

		private final Configuration conf;
		private final String username, password;
		private final int auth_type;
		private final Integer user_color;

		private final Context context;

		public SignInTask(final SignInActivity context, final Configuration conf, final String username,
				final String password, final int auth_type, final Integer user_color) {
			super(context, conf);
			this.context = context;
			this.conf = conf;
			this.username = username;
			this.password = password;
			this.auth_type = auth_type;
			this.user_color = user_color;
		}

		@Override
		protected SigninResponse doInBackground(final Void... params) {
			try {
				switch (auth_type) {
					case Accounts.AUTH_TYPE_OAUTH:
						return authOAuth();
					case Accounts.AUTH_TYPE_XAUTH:
						return authxAuth();
					case Accounts.AUTH_TYPE_BASIC:
						return authBasic();
					case Accounts.AUTH_TYPE_TWIP_O_MODE:
						return authTwipOMode();
				}
				return authOAuth();
			} catch (final TwitterException e) {
				return new SigninResponse(false, false, e);
			} catch (final AuthenticationException e) {
				return new SigninResponse(false, false, e);
			}
		}

		private SigninResponse authBasic() throws TwitterException {
			final Twitter twitter = new TwitterFactory(conf).getInstance(new BasicAuthorization(username, password));
			final User user = twitter.verifyCredentials();
			final long user_id = user.getId();
			if (user_id <= 0) return new SigninResponse(false, false, null);
			if (isUserLoggedIn(context, user_id)) return new SigninResponse(true, false, null);
			final int color = user_color != null ? user_color : analyseUserProfileColor(user);
			return new SigninResponse(false, true, null, conf, password, null, user, Accounts.AUTH_TYPE_BASIC, color);
		}

		private SigninResponse authOAuth() throws AuthenticationException, TwitterException {
			final Twitter twitter = new TwitterFactory(conf).getInstance();
			final OAuthPasswordAuthenticator authenticator = new OAuthPasswordAuthenticator(twitter);
			final AccessToken access_token = authenticator.getOAuthAccessToken(username, password);
			final long user_id = access_token.getUserId();
			if (user_id <= 0) return new SigninResponse(false, false, null);
			final User user = twitter.showUser(user_id);
			if (isUserLoggedIn(context, user_id)) return new SigninResponse(true, false, null);
			final int color = user_color != null ? user_color : analyseUserProfileColor(user);
			return new SigninResponse(false, true, null, conf, null, access_token, user, Accounts.AUTH_TYPE_OAUTH,
					color);
		}

		private SigninResponse authTwipOMode() throws TwitterException {
			final Twitter twitter = new TwitterFactory(conf).getInstance(new TwipOModeAuthorization());
			final User user = twitter.verifyCredentials();
			final long user_id = user.getId();
			if (user_id <= 0) return new SigninResponse(false, false, null);
			if (isUserLoggedIn(context, user_id)) return new SigninResponse(true, false, null);
			final int color = user_color != null ? user_color : analyseUserProfileColor(user);
			return new SigninResponse(false, true, null, conf, null, null, user, Accounts.AUTH_TYPE_TWIP_O_MODE, color);
		}

		private SigninResponse authxAuth() throws TwitterException {
			final Twitter twitter = new TwitterFactory(conf).getInstance();
			final AccessToken access_token = twitter.getOAuthAccessToken(username, password);
			final User user = twitter.showUser(access_token.getUserId());
			final long user_id = user.getId();
			if (user_id <= 0) return new SigninResponse(false, false, null);
			if (isUserLoggedIn(context, user_id)) return new SigninResponse(true, false, null);
			final int color = user_color != null ? user_color : analyseUserProfileColor(user);
			return new SigninResponse(false, true, null, conf, null, access_token, user, Accounts.AUTH_TYPE_XAUTH,
					color);
		}

	}

	static interface SigninCallback {
		void onSigninResult(SigninResponse response);

		void onSigninStart();
	}

	static class SigninResponse {

		public final boolean already_logged_in, succeed;
		public final Exception exception;
		final Configuration conf;
		final String basic_password;
		final AccessToken access_token;
		final User user;
		final int auth_type, color;

		public SigninResponse(final boolean already_logged_in, final boolean succeed, final Exception exception) {
			this(already_logged_in, succeed, exception, null, null, null, null, 0, 0);
		}

		public SigninResponse(final boolean already_logged_in, final boolean succeed, final Exception exception,
				final Configuration conf, final String basic_password, final AccessToken access_token, final User user,
				final int auth_type, final int color) {
			this.already_logged_in = already_logged_in;
			this.succeed = succeed;
			this.exception = exception;
			this.conf = conf;
			this.basic_password = basic_password;
			this.access_token = access_token;
			this.user = user;
			this.auth_type = auth_type;
			this.color = color;
		}
	}
}