The file containing the source code shown below is located in the corresponding directory in <sdk>/samples/android-<version>/...
/*
* Copyright (C) 2010 The Android开源工程
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.example.android.samplesync.authenticator;
import com.example.android.samplesync.Constants;
import com.example.android.samplesync.client.NetworkUtilities;
import android.accounts.AbstractAccountAuthenticator;
import android.accounts.Account;
import android.accounts.AccountAuthenticatorResponse;
import android.accounts.AccountManager;
import android.accounts.NetworkErrorException;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
/**
* This class is an implementation of AbstractAccountAuthenticator for
* authenticating accounts in the com.example.android.samplesync domain. The
* interesting thing that this class demonstrates is the use of authTokens as
* part of the authentication process. In the account setup UI, the user enters
* their username and password. But for our subsequent calls off to the service
* for syncing, we want to use an authtoken instead - so we're not continually
* sending the password over the wire. getAuthToken() will be called when
* SyncAdapter calls AccountManager.blockingGetAuthToken(). When we get called,
* we need to return the appropriate authToken for the specified account. If we
* already have an authToken stored in the account, we return that authToken. If
* we don't, but we do have a username and password, then we'll attempt to talk
* to the sample service to fetch an authToken. If that fails (or we didn't have
* a username/password), then we need to prompt the user - so we create an
* AuthenticatorActivity intent and return that. That will display the dialog
* that prompts the user for their login information.
*/
class Authenticator extends AbstractAccountAuthenticator {
/** The tag used to log to adb console. **/
private static final String TAG = "Authenticator";
// Authentication Service context
private final Context mContext;
public Authenticator(Context context) {
super(context);
mContext = context;
}
@Override
public Bundle addAccount(AccountAuthenticatorResponse response, String accountType,
String authTokenType, String[] requiredFeatures, Bundle options) {
Log.v(TAG, "addAccount()");
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;
}
@Override
public Bundle confirmCredentials(
AccountAuthenticatorResponse response, Account account, Bundle options) {
Log.v(TAG, "confirmCredentials()");
return null;
}
@Override
public Bundle editProperties(AccountAuthenticatorResponse response, String accountType) {
Log.v(TAG, "editProperties()");
throw new UnsupportedOperationException();
}
@Override
public Bundle getAuthToken(AccountAuthenticatorResponse response, Account account,
String authTokenType, Bundle loginOptions) throws NetworkErrorException {
Log.v(TAG, "getAuthToken()");
// If the caller requested an authToken type we don't support, then
// return an error
if (!authTokenType.equals(Constants.AUTHTOKEN_TYPE)) {
final Bundle result = new Bundle();
result.putString(AccountManager.KEY_ERROR_MESSAGE, "invalid authTokenType");
return result;
}
// Extract the username and password from the Account Manager, and ask
// the server for an appropriate AuthToken.
final AccountManager am = AccountManager.get(mContext);
final String password = am.getPassword(account);
if (password != null) {
final String authToken = NetworkUtilities.authenticate(account.name, password);
if (!TextUtils.isEmpty(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;
}
}
// If we get here, then we couldn't access the user's password - so we
// need to re-prompt them for their credentials. We do that by creating
// an intent to display our AuthenticatorActivity panel.
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;
}
@Override
public String getAuthTokenLabel(String authTokenType) {
// null means we don't support multiple authToken types
Log.v(TAG, "getAuthTokenLabel()");
return null;
}
@Override
public Bundle hasFeatures(
AccountAuthenticatorResponse response, Account account, String[] features) {
// This call is used to query whether the Authenticator supports
// specific features. We don't expect to get called, so we always
// return false (no) for any queries.
Log.v(TAG, "hasFeatures()");
final Bundle result = new Bundle();
result.putBoolean(AccountManager.KEY_BOOLEAN_RESULT, false);
return result;
}
@Override
public Bundle updateCredentials(AccountAuthenticatorResponse response, Account account,
String authTokenType, Bundle loginOptions) {
Log.v(TAG, "updateCredentials()");
return null;
}
}