Authenticator.java

/* 
 * Copyright (C) 2011 - 2013 Michi Gysel <michael.gysel@gmail.com>
 *
 * This file is part of the HSR Timetable.
 *
 * 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 ch.scythe.hsr.authenticator;

import android.accounts.AbstractAccountAuthenticator;
import android.accounts.Account;
import android.accounts.AccountAuthenticatorResponse;
import android.accounts.AccountManager;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import ch.scythe.hsr.Constants;
import ch.scythe.hsr.R;

/** This class is an implementation of AbstractAccountAuthenticator for authenticating accounts in the com.example.android.samplesync domain. */
class Authenticator extends AbstractAccountAuthenticator {
	// Authentication Service context
	private final Context mContext;

	public Authenticator(Context context) {
		super(context);
		mContext = context;
	}

	/** {@inheritDoc} */
	@Override
	public Bundle addAccount(AccountAuthenticatorResponse response, String accountType, String authTokenType, String[] requiredFeatures, Bundle options) {
		final Intent intent = new Intent(mContext, AuthenticatorActivity.class);
		intent.putExtra(AuthenticatorActivity.PARAM_AUTHTOKEN_TYPE, authTokenType);
		intent.putExtra(AccountManager.KEY_ACCOUNT_AUTHENTICATOR_RESPONSE, response);
		final Bundle bundle = new Bundle();
		bundle.putParcelable(AccountManager.KEY_INTENT, intent);
		return bundle;
	}

	/** {@inheritDoc} */
	@Override
	public Bundle confirmCredentials(AccountAuthenticatorResponse response, Account account, Bundle options) {
		Log.e("Authenticator", "confirmCredentials called!");
		return null;
	}

	/** {@inheritDoc} */
	@Override
	public Bundle editProperties(AccountAuthenticatorResponse response, String accountType) {
		throw new UnsupportedOperationException();
	}

	/** {@inheritDoc} */
	@Override
	public Bundle getAuthToken(AccountAuthenticatorResponse response, Account account, String authTokenType, Bundle loginOptions) {
		if (!authTokenType.equals(Constants.AUTHTOKEN_TYPE)) {
			final Bundle result = new Bundle();
			result.putString(AccountManager.KEY_ERROR_MESSAGE, "invalid authTokenType");
			return result;
		}
		final AccountManager am = AccountManager.get(mContext);
		final String password = am.getPassword(account);
		if (password != null) {
			final boolean verified = onlineConfirmPassword(account.name, password);
			if (verified) {
				final Bundle result = new Bundle();
				result.putString(AccountManager.KEY_ACCOUNT_NAME, account.name);
				result.putString(AccountManager.KEY_ACCOUNT_TYPE, Constants.ACCOUNT_TYPE);
				result.putString(AccountManager.KEY_AUTHTOKEN, password);
				return result;
			}
		}
		// the password was missing or incorrect, return an Intent to an
		// Activity that will prompt the user for the password.
		final Intent intent = new Intent(mContext, AuthenticatorActivity.class);
		intent.putExtra(AuthenticatorActivity.PARAM_USERNAME, account.name);
		intent.putExtra(AuthenticatorActivity.PARAM_AUTHTOKEN_TYPE, authTokenType);
		intent.putExtra(AccountManager.KEY_ACCOUNT_AUTHENTICATOR_RESPONSE, response);
		final Bundle bundle = new Bundle();
		bundle.putParcelable(AccountManager.KEY_INTENT, intent);
		return bundle;
	}

	/** {@inheritDoc} */
	@Override
	public String getAuthTokenLabel(String authTokenType) {
		if (authTokenType.equals(Constants.AUTHTOKEN_TYPE)) {
			return mContext.getString(R.string.app_name);
		}
		return null;

	}

	/** {@inheritDoc} */
	@Override
	public Bundle hasFeatures(AccountAuthenticatorResponse response, Account account, String[] features) {
		final Bundle result = new Bundle();
		result.putBoolean(AccountManager.KEY_BOOLEAN_RESULT, false);
		return result;
	}

	/** Validates user's password on the server */
	private boolean onlineConfirmPassword(String username, String password) {
		return true;
	}

	/** {@inheritDoc} */
	@Override
	public Bundle updateCredentials(AccountAuthenticatorResponse response, Account account, String authTokenType, Bundle loginOptions) {
		final Intent intent = new Intent(mContext, AuthenticatorActivity.class);
		intent.putExtra(AuthenticatorActivity.PARAM_USERNAME, account.name);
		intent.putExtra(AuthenticatorActivity.PARAM_AUTHTOKEN_TYPE, authTokenType);
		intent.putExtra(AuthenticatorActivity.PARAM_CONFIRMCREDENTIALS, false);
		final Bundle bundle = new Bundle();
		bundle.putParcelable(AccountManager.KEY_INTENT, intent);
		return bundle;
	}

}