我正在使用经过开发人员验证的技术来实现此类,如here所述。 。到目前为止,我已经能够实现此类并构建一个框架,在其中检查 CognitoCachingCredentialsProvider.getCachedIdentityId() 以查看用户是否已登录(因此不需要通过输入电子邮件和密码来重新进行身份验证) )。为此,我在名为 Util 的类中使用了一系列静态方法,因为这些方法只需实例化一次。它看起来像这样:
package com.pranskee.boxesapp;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ExecutionException;
import org.json.JSONException;
import org.json.JSONObject;
import android.content.Context;
import android.util.Log;
import com.amazonaws.auth.AWSAbstractCognitoIdentityProvider;
import com.amazonaws.auth.CognitoCachingCredentialsProvider;
import com.amazonaws.mobileconnectors.cognito.*;
import com.amazonaws.regions.Regions;
public class Util {
private final static String TAG = "Util";
private static final String AWS_ACCOUNT_ID = {acct id};
private static final String COGNITO_POOL_ID = {pool id};
private static final String COGNITO_ROLE_AUTH = {auth arn};
private static final String COGNITO_ROLE_UNAUTH = {unauth arn}
private static CognitoCachingCredentialsProvider sCredProvider;
private static UserIdentityProvider sIdProvider;
private static CognitoSyncManager sSyncManager;
private Util() {
}
public static CognitoCachingCredentialsProvider getCredProvider(
Context context) {
if (sCredProvider == null) {
if (sIdProvider == null) {
CognitoCachingCredentialsProvider tmpProvider = new CognitoCachingCredentialsProvider(
context.getApplicationContext(), AWS_ACCOUNT_ID,
COGNITO_POOL_ID, COGNITO_ROLE_UNAUTH,
COGNITO_ROLE_AUTH, Regions.US_EAST_1);
if (tmpProvider.getCachedIdentityId() != null) {
sCredProvider = tmpProvider;
} else {
sCredProvider = null;
}
} else {
sCredProvider = new CognitoCachingCredentialsProvider(
context.getApplicationContext(), sIdProvider,
COGNITO_ROLE_UNAUTH, COGNITO_ROLE_AUTH);
}
}
return sCredProvider;
}
public static UserIdentityProvider getIdentityProvider(Context context,
String email, String pwd) {
if (sIdProvider == null) {
sIdProvider = new UserIdentityProvider(AWS_ACCOUNT_ID,
COGNITO_POOL_ID, context.getApplicationContext(), email,
pwd);
Map logins = new HashMap();
logins.put({Developer Provider Name}, sIdProvider.getToken());
sIdProvider.setLogins(logins);
}
return sIdProvider;
}
public static boolean isLoggedIn(Context context) {
if (getCredProvider(context) == null) {
return false;
}
return true;
}
private static CognitoSyncManager getSyncManager(Context context) {
if (sSyncManager == null) {
sSyncManager = new CognitoSyncManager(
context.getApplicationContext(), Regions.US_EAST_1,
sCredProvider);
}
return sSyncManager;
}
protected static class UserIdentityProvider extends
AWSAbstractCognitoIdentityProvider {
private Context context;
private String email;
private String password;
public UserIdentityProvider(String accountId, String identityPoolId,
Context c, String em, String pwd) {
super(accountId, identityPoolId);
context = c;
email = em;
password = pwd;
}
@Override
public String refresh() {
try {
ServerCommunicator server = new ServerCommunicator(context);
//this is a server call, which makes the call GetOpenIdTokenForDeveloperIdentityRequest after I authenticate the user and send AWS my user's token
String response = server.initUserLoginAsyncTask()
.execute(email, password).get();
JSONObject responseJSON = new JSONObject(response);
String identityId = responseJSON.getString("id");
String token = responseJSON.getString("token");
this.setToken(token);
this.setIdentityId(identityId);
update(identityId, token);
return token;
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
@Override
public String getProviderName() {
return {Developer Provider Name};
}
}
}
现在,我还想实现注销。我认为我需要做的是以某种方式删除缓存的身份 ID,但我不确定最好的方法是什么。或者,也许根本不是那样,我需要做一些完全不同的事情。无论哪种方式,我只想实现允许用户选择“注销”我的应用程序的预期行为,这会导致 Cognito 忘记该 ID 已登录到身份池中,并使再次建立身份 ID 的任何尝试无效无需再次执行我的身份验证过程。
最佳答案
注销过程分为两个步骤,首先您需要从对您的用户进行身份验证的身份提供商(Amazon、Google、Facebook 或您自己的)注销。有关如何执行此操作的说明特定于您的提供商。
从 CognitoIdentity 方面,您需要告诉 CredentialsProvider 清除与您的身份相关的所有状态和缓存。使用 Android SDK,您可以在 CredentialsProvider 上调用clear()(请参阅 http://docs.aws.amazon.com/AWSAndroidSDK/latest/javadoc/com/amazonaws/auth/CognitoCredentialsProvider.html)
关于amazon-web-services - CognitoCachingCredentialsProvider (Android) - 如何注销和删除缓存的凭据,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27293179/