Authenticator.java

/*
 * PinDroid - http://code.google.com/p/PinDroid/
 *
 * Copyright (C) 2010 Matt Schmidt
 *
 * PinDroid 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.
 *
 * PinDroid 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 PinDroid; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */

package com.pindroid.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 com.pindroid.Constants;
import com.pindroid.client.PinboardApi;

/**
 * This class is an implementation of AbstractAccountAuthenticator for
 * authenticating accounts in the com.pindroid 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(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) {
        if (options != null && options.containsKey(AccountManager.KEY_PASSWORD)) {
            final String password = options.getString(AccountManager.KEY_PASSWORD);
            final String verified = onlineConfirmPassword(account, password);
            final Bundle result = new Bundle();
            boolean confirmed = verified != null;
            result.putBoolean(AccountManager.KEY_BOOLEAN_RESULT, confirmed);
            return result;
        }
        // Launch AuthenticatorActivity to confirm credentials
        final Intent intent = new Intent(mContext, AuthenticatorActivity.class);
        intent.putExtra(AuthenticatorActivity.PARAM_USERNAME, account.name);
        intent.putExtra(AuthenticatorActivity.PARAM_CONFIRMCREDENTIALS, true);
        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 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);
        am.setPassword(account, null);
    	
        if (password != null) {
            final String authToken = onlineConfirmPassword(account, password);
            if (authToken != null) {
            	
            	am.setAuthToken(account, Constants.AUTHTOKEN_TYPE, authToken);
            	
                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, authToken);
                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) {
        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 String onlineConfirmPassword(Account account, String password) {
    	return PinboardApi.pinboardAuthenticate(account.name, password);
    }

    /**
     * {@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_CONFIRMCREDENTIALS, false);
        final Bundle bundle = new Bundle();
        bundle.putParcelable(AccountManager.KEY_INTENT, intent);
        return bundle;
    }
}