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The AWS Android SDK for Amazon S3 module holds the client classes that are used for communicating with Amazon Simple Storage Service
/**
* Copyright 2011-2015 Amazon Technologies, Inc.
*
* 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://aws.amazon.com/apache2.0
*
* This file 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.amazonaws.auth;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.AmazonWebServiceRequest;
import com.amazonaws.ClientConfiguration;
import com.amazonaws.SDKGlobalConfiguration;
import com.amazonaws.regions.Region;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.cognitoidentity.AmazonCognitoIdentity;
import com.amazonaws.services.cognitoidentity.AmazonCognitoIdentityClient;
import com.amazonaws.services.cognitoidentity.model.GetCredentialsForIdentityRequest;
import com.amazonaws.services.cognitoidentity.model.GetCredentialsForIdentityResult;
import com.amazonaws.services.securitytoken.AWSSecurityTokenService;
import com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClient;
import com.amazonaws.services.securitytoken.model.AssumeRoleWithWebIdentityRequest;
import com.amazonaws.services.securitytoken.model.AssumeRoleWithWebIdentityResult;
import com.amazonaws.services.securitytoken.model.Credentials;
import com.amazonaws.services.cognitoidentity.model.ResourceNotFoundException;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
/**
* AWSCredentialsProvider implementation that uses the Amazon Cognito Identity
* service and AWS Security Token Service to create temporary, short-lived
* sessions to use for authentication
*/
public class CognitoCredentialsProvider implements AWSCredentialsProvider {
/** Used in the enhanced get credentials flow */
private AmazonCognitoIdentity cib;
/** Handle the identity-specific interactions */
private final AWSCognitoIdentityProvider identityProvider;
/** Default duration for started sessions */
public static final int DEFAULT_DURATION_SECONDS = 3600;
/** Default threshold for refreshing session credentials */
public static final int DEFAULT_THRESHOLD_SECONDS = 500;
/** The current session credentials */
protected AWSSessionCredentials sessionCredentials;
/** The expiration time for the current session credentials */
protected Date sessionCredentialsExpiration;
/** The current Token */
protected String token;
/**
* The client for starting STS sessions, used in the basic (non-enhanced
* flow)
*/
protected AWSSecurityTokenService securityTokenService;
protected int sessionDuration;
protected int refreshThreshold;
protected String unauthRoleArn;
protected String authRoleArn;
protected boolean useEnhancedFlow;
/**
* Constructs a new {@link CognitoCredentialsProvider}, which will use the
* specified Amazon Cognito identity pool to make a request, using the basic
* authentication flow, to the AWS Security Token Service (STS) to request
* short-lived session credentials, which will then be returned by this
* class's {@link #getCredentials()} method.
*
* @param accountId The AWS accountId for the account with Amazon Cognito
* @param identityPoolId The Amazon Cogntio identity pool to use
* @param unauthRoleArn The ARN of the IAM Role that will be assumed when
* unauthenticated
* @param authRoleArn The ARN of the IAM Role that will be assumed when
* authenticated
* @param region The region to use when contacting Cognito Identity
*/
public CognitoCredentialsProvider(String accountId, String identityPoolId,
String unauthRoleArn, String authRoleArn, Regions region) {
this(accountId, identityPoolId, unauthRoleArn, authRoleArn, region,
new ClientConfiguration());
}
/**
* Constructs a new {@link CognitoCredentialsProvider}, which will use the
* specified Amazon Cognito identity pool to make a request, using the basic
* authentication flow, to the AWS Security Token Service (STS) to request
* short-lived session credentials, which will then be returned by this
* class's {@link #getCredentials()} method.
*
* This version of the constructor allows you to specify a client
* configuration for the Amazon Cognito and STS clients.
*
*
* @param accountId The AWS accountId for the account with Amazon Cognito
* @param identityPoolId The Amazon Cognito identity pool to use
* @param unauthRoleArn The ARN of the IAM Role that will be assumed when
* unauthenticated
* @param authRoleArn The ARN of the IAM Role that will be assumed when
* authenticated
* @param region The region to use when contacting Cognito Identity
* @param clientConfiguration Configuration to apply to service clients
* created
*/
public CognitoCredentialsProvider(String accountId, String identityPoolId,
String unauthRoleArn, String authRoleArn, Regions region,
ClientConfiguration clientConfiguration) {
this.cib = new AmazonCognitoIdentityClient(
new AnonymousAWSCredentials(), clientConfiguration);
this.cib.setRegion(Region.getRegion(region));
this.sessionDuration = DEFAULT_DURATION_SECONDS;
this.refreshThreshold = DEFAULT_THRESHOLD_SECONDS;
this.unauthRoleArn = unauthRoleArn;
this.authRoleArn = authRoleArn;
this.useEnhancedFlow = (unauthRoleArn == null && authRoleArn == null);
if (this.useEnhancedFlow) {
this.securityTokenService = null;
this.identityProvider = new AWSEnhancedCognitoIdentityProvider(accountId,
identityPoolId, cib);
} else {
this.securityTokenService = new AWSSecurityTokenServiceClient(
new AnonymousAWSCredentials(), clientConfiguration);
this.identityProvider = new AWSBasicCognitoIdentityProvider(accountId, identityPoolId,
this.cib);
}
}
/**
* Constructs a new {@link CognitoCredentialsProvider}, which will use the
* specified Amazon Cognito identity pool to make a request to Cognito,
* using the enhanced flow, to get short lived session credentials, which
* will then be returned by this class's {@link #getCredentials()} method.
*
* @param identityPoolId The Amazon Cognito identity pool to use
* @param region The region to use when contacting Cognito Identity
*/
public CognitoCredentialsProvider(String identityPoolId, Regions region) {
this(null, identityPoolId, null, null, region, new ClientConfiguration());
}
/**
* Constructs a new {@link CognitoCredentialsProvider}, which will use the
* specified Amazon Cognito identity pool to make a request to Cognito,
* using the enhanced flow, to get short lived session credentials, which
* will then be returned by this class's {@link #getCredentials()} method.
*
* This version of the constructor allows you to specify a client
* configuration for the Amazon Cognito client.
*
*
* @param identityPoolId The Amazon Cognito identity pool to use
* @param region The region to use when contacting Cognito Identity
* @param clientConfiguration Configuration to apply to service clients
* created
*/
public CognitoCredentialsProvider(String identityPoolId, Regions region,
ClientConfiguration clientConfiguration) {
this(null, identityPoolId, null, null, region, clientConfiguration);
}
/**
* Constructs a new {@link CognitoCredentialsProvider}, which will use the
* specified Amazon Cognito identity pool to make a request to the AWS
* Security Token Service (STS) to get short-lived session credentials,
* which will then be returned by this class's {@link #getCredentials()}
* method.
*
* This version of the constructor allows you to specify the Amazon Cognito
* and STS client to use.
*
*
* Set the roles and stsClient to null to use the enhanced authentication
* flow, not contacting STS. Otherwise the basic flow will be used.
*
*
* @param accountId The AWS accountId for the account with Amazon Cognito
* @param identityPoolId The Amazon Cogntio identity pool to use
* @param unauthRoleArn The ARN of the IAM Role that will be assumed when
* unauthenticated
* @param authRoleArn The ARN of the IAM Role that will be assumed when
* authenticated
* @param cibClient Preconfigured CognitoIdentity client to make requests
* with
* @param stsClient Preconfigured STS client to make requests with
*/
public CognitoCredentialsProvider(String accountId, String identityPoolId,
String unauthRoleArn, String authRoleArn, AmazonCognitoIdentityClient cibClient,
AWSSecurityTokenService stsClient) {
// No need to specify parameters for Region and ClientConfig because we
// don't create the clients
this.cib = cibClient;
this.securityTokenService = stsClient;
this.unauthRoleArn = unauthRoleArn;
this.authRoleArn = authRoleArn;
this.sessionDuration = DEFAULT_DURATION_SECONDS;
this.refreshThreshold = DEFAULT_THRESHOLD_SECONDS;
this.useEnhancedFlow = (unauthRoleArn == null && authRoleArn == null);
if (this.useEnhancedFlow) {
this.identityProvider = new AWSEnhancedCognitoIdentityProvider(accountId,
identityPoolId,
cibClient);
} else {
this.identityProvider = new AWSBasicCognitoIdentityProvider(accountId, identityPoolId,
cibClient);
}
}
/**
* Constructs a new CognitoCredentialsProvider, which will set up a link to
* the provider passed in using the basic authentication flow to get get
* short-lived credentials from STS, which can be retrieved from
* {@link #getCredentials()}
*
* This version of the constructor allows you to specify your own Identity
* Provider class.
*
*
* @param provider a reference to the provider in question, including what's
* needed to interact with it to later connect with STS
* @param unauthArn the unauthArn, for use with the STS call
* @param authArn the authArn, for use with the STS call
*/
public CognitoCredentialsProvider(AWSCognitoIdentityProvider provider,
String unauthArn, String authArn) {
this(provider, unauthArn, authArn, new AWSSecurityTokenServiceClient(
new AnonymousAWSCredentials(), new ClientConfiguration()));
}
/**
* Constructs a new CognitoCredentialsProvider, which will set up a link to
* the provider passed in to use the basic authentication flow to get
* short-lived credentials from STS, which can be retrieved from
* {@link #getCredentials()}
*
* This version of the constructor allows you to specify your own Identity
* Provider class, and the STS client to use.
*
*
* @param provider a reference to the provider in question, including what's
* needed to interact with it to later connect with STS
* @param unauthArn the unauthArn, for use with the STS call
* @param authArn the authArn, for use with the STS call
* @param stsClient the sts endpoint to get session credentials from
*/
public CognitoCredentialsProvider(AWSCognitoIdentityProvider provider,
String unauthArn, String authArn, AWSSecurityTokenService stsClient) {
this.identityProvider = provider;
this.unauthRoleArn = unauthArn;
this.authRoleArn = authArn;
this.securityTokenService = stsClient;
this.sessionDuration = DEFAULT_DURATION_SECONDS;
this.refreshThreshold = DEFAULT_THRESHOLD_SECONDS;
this.useEnhancedFlow = false;
}
/**
* Constructs a new CognitoCredentialsProvider, which will set up a link to
* the provider passed in using the enhanced authentication flow to get
* short-lived credentials from Amazon Cognito, which can be retrieved from
* {@link #getCredentials()}
*
* This version of the constructor allows you to specify your own Identity
* Provider class.
*
*
* @param provider a reference to the provider in question, including what's
* needed to interact with it to later connect with Amazon
* Cognito
* @param region The region to use when contacting Cognito
*/
public CognitoCredentialsProvider(AWSCognitoIdentityProvider provider, Regions region) {
this(provider, region, new ClientConfiguration());
}
/**
* Constructs a new CognitoCredentialsProvider, which will set up a link to
* the provider passed in using the enhanced authentication flow to get
* short-lived credentials from Amazon Cognito, which can be retrieved from
* {@link #getCredentials()}
*
* This version of the constructor allows you to specify your own Identity
* Provider class and the configuration for the Amazon Cognito client.
*
*
* @param provider a reference to the provider in question, including what's
* needed to interact with it to later connect with Amazon
* Cognito
* @param clientConfiguration Configuration to apply to service clients
* created
* @param region The region to use when contacting Cognito Identity
*/
public CognitoCredentialsProvider(AWSCognitoIdentityProvider provider,
Regions region, ClientConfiguration clientConfiguration) {
this.cib = new AmazonCognitoIdentityClient(
new AnonymousAWSCredentials(), new ClientConfiguration());
this.cib.setRegion(Region.getRegion(region));
this.identityProvider = provider;
this.unauthRoleArn = null;
this.authRoleArn = null;
this.securityTokenService = null;
this.sessionDuration = DEFAULT_DURATION_SECONDS;
this.refreshThreshold = DEFAULT_THRESHOLD_SECONDS;
this.useEnhancedFlow = true;
}
public String getIdentityId() {
return identityProvider.getIdentityId();
}
public String getToken() {
return identityProvider.getToken();
}
public AWSIdentityProvider getIdentityProvider() {
return identityProvider;
}
public void setSessionCredentialsExpiration(Date expiration) {
sessionCredentialsExpiration = expiration;
}
public Date getSessionCredentitalsExpiration() {
return sessionCredentialsExpiration;
}
public String getIdentityPoolId() {
return identityProvider.getIdentityPoolId();
}
/**
* If the current session has expired/credentials are invalid, a new session
* is started, establishing the credentials. In either case, those
* credentials are returned
*/
@Override
public AWSSessionCredentials getCredentials() {
if (needsNewSession()) {
startSession();
}
return sessionCredentials;
}
/**
* Set the duration of the session credentials created by this client in
* seconds. Values must be supported by AssumeRoleWithWebIdentityRequest.
*
* @see com.amazonaws.services.securitytoken.model.AssumeRoleWithWebIdentityRequest
* @param sessionDuration The new duration for session credentials created
* by this provider
*/
public void setSessionDuration(int sessionDuration) {
this.sessionDuration = sessionDuration;
}
/**
* Set the duration of the session credentials created by this client in
* seconds. Values must be supported by AssumeRoleWithWebIdentityRequest.
* Returns reference to object so methods can be chained together.
*
* @see com.amazonaws.services.securitytoken.model.AssumeRoleWithWebIdentityRequest
* @param sessionDuration The new duration for session credentials created
* by this provider
* @return A reference to this updated object so that method calls can be
* chained together.
*/
public CognitoCredentialsProvider withSessionDuration(int sessionDuration) {
this.setSessionDuration(sessionDuration);
return this;
}
/**
* Get the duration of the session credentials created by this client in
* seconds. Values must be supported by AssumeRoleWithWebIdentityRequest.
*
* @see com.amazonaws.services.securitytoken.model.AssumeRoleWithWebIdentityRequest
* @return The duration for session credentials created by this provider
*/
public int getSessionDuration() {
return this.sessionDuration;
}
/**
* Set the refresh threshold for the session credentials created by this
* client in seconds. This value will be used internally to determine if new
* credentials should be fetched from STS.
*
* @see com.amazonaws.services.securitytoken.model.AssumeRoleWithWebIdentityRequest
* @param refreshThreshold The new refresh threshold for session credentials
* created by this provider
*/
public void setRefreshThreshold(int refreshThreshold) {
this.refreshThreshold = refreshThreshold;
}
/**
* Set the refresh threshold for the session credentials created by this
* client in seconds. This value will be used internally to determine if new
* credentials should be fetched from STS. Returns a reference to the object
* so methods can be chained.
*
* @see com.amazonaws.services.securitytoken.model.AssumeRoleWithWebIdentityRequest
* @param refreshThreshold The new refresh threshold for session credentials
* created by this provider
* @return A reference to this updated object so that method calls can be
* chained together.
*/
public CognitoCredentialsProvider withRefreshThreshold(int refreshThreshold) {
this.setRefreshThreshold(refreshThreshold);
return this;
}
/**
* Get the refresh threshold for the session credentials created by this
* client in seconds. This value will be used internally to determine if new
* credentials should be fetched from STS.
*
* @see com.amazonaws.services.securitytoken.model.AssumeRoleWithWebIdentityRequest
* @return The refresh threshold for session credentials created by this
* provider
*/
public int getRefreshThreshold() {
return this.refreshThreshold;
}
protected void setIdentityId(String identityId) {
identityProvider.identityChanged(identityId);
}
/**
* Set the logins map used to authenticated with Amazon Cognito. Note: You
* should manually call refresh on on the credentials provider after adding
* logins to the provider as your Identity Id may have changed.
*
* @param logins The new logins map (providerName, providerToken) to use to
* communicate with Amazon Cognito
*/
public void setLogins(Map logins) {
identityProvider.setLogins(logins);
this.sessionCredentials = null;
}
/**
* Set the logins map used to authenticated with Amazon Cognito. Returns a
* reference to the object so methods can be chained. Note: You should
* manually call refresh on on the credentials provider after adding logins
* to the provider as your Identity Id may have changed.
*
* @see com.amazonaws.services.securitytoken.model.AssumeRoleWithWebIdentityRequest
* @param logins The new logins map (providerName, providerToken) to use to
* communicate with Amazon Cognito
* @return A reference to this updated object so that method calls can be
* chained together.
*/
public AWSCredentialsProvider withLogins(Map logins) {
this.setLogins(logins);
return this;
}
/**
* Get the logins map used to authenticated with Amazon Cognito
*
* @return The logins map (providerName, providerToken) to use to
* communicate with Amazon Cognito
*/
public Map getLogins() {
return identityProvider.getLogins();
}
@Override
public void refresh() {
startSession();
}
/**
* Clear all in-memory and saved state for the credentials provider. Will
* destroy any saved Amazon Cognito Identity Id and associated AWS
* credentials.
*/
public void clear() {
sessionCredentials = null;
sessionCredentialsExpiration = null;
setIdentityId(null);
identityProvider.setLogins(new HashMap());
}
/**
* Clear credentials. This will destroy all the saved AWS credentials but
* not the identity Id.
*/
public void clearCredentials() {
sessionCredentials = null;
sessionCredentialsExpiration = null;
}
/**
* Starts a new session by getting short lived session credentials.
*/
protected void startSession() {
// make sure we have an identityId. In the case of cognito identity,
// the try catch will handle a deleted or corrupted id.
// Developer authenticated won't throw amazon exceptions,
// and for 2hop, it will be handled below, as the getId call
// won't fail since it is set.
try {
token = identityProvider.refresh();
} catch (ResourceNotFoundException rnfe) {
// If the identity id or identity pool is non-existant, this is thrown
token = retryRefresh();
} catch (AmazonServiceException ase) {
// If it's a corrupt id, then a validation exception is thrown
if (ase.getErrorCode().equals("ValidationException")) {
token = retryRefresh();
}
else {
throw ase;
}
}
if (useEnhancedFlow) {
populateCredentialsWithCognito(token);
} else {
populateCredentialsWithSts(token);
}
}
/**
* To be used to call the provider back end to get identifiers. Specifically,
* this is the helper that handles the case for when a refresh call ran into the corrupt
* identity id case, either a deleted id or a malformed id. If that happens, this is
* called, a new id and token are fetched, and the process is resumed.
*
* @return the new token gotten by the service
*/
private String retryRefresh() {
// Ensure we get a new id and token
setIdentityId(null);
token = identityProvider.refresh();
return token;
}
/**
* To be used to help the calling of the 2hop flow in event of the identity id
* being either missing or deleted. Once that is caught as having happened, this
* call is made, which will clear the old id, get a new one/token, and get the
* flow going back to where it was with a new request
*
* @return the result of the new request
*/
private GetCredentialsForIdentityResult retryGetCredentialsForIdentity(){
token = retryRefresh();
Map logins;
if (token != null && !token.isEmpty()) {
logins = new HashMap();
logins.put("cognito-identity.amazonaws.com", token);
} else {
logins = getLogins();
}
GetCredentialsForIdentityRequest request = new GetCredentialsForIdentityRequest()
.withIdentityId(getIdentityId())
.withLogins(logins);
return cib.getCredentialsForIdentity(request);
}
/**
* Gets the session credentials from Amazon Cognito.
*/
private void populateCredentialsWithCognito(String token) {
// For Cognito-authenticated identities token will always be null, but
// for developer-authenticated identities, refresh() may return a token
// that the the developer backend has received from Cognito and we have
// to send back in our request.
Map logins;
if (token != null && !token.isEmpty()) {
logins = new HashMap();
logins.put("cognito-identity.amazonaws.com", token);
} else {
logins = getLogins();
}
GetCredentialsForIdentityRequest request = new GetCredentialsForIdentityRequest()
.withIdentityId(getIdentityId())
.withLogins(logins);
GetCredentialsForIdentityResult result = null;
try {
result = cib.getCredentialsForIdentity(request);
} catch (ResourceNotFoundException rnfe) {
// If the identity id or identity pool is non-existant, this is thrown
result = retryGetCredentialsForIdentity();
} catch (AmazonServiceException ase) {
// If it's a corrupt id, then a validation exception is thrown
if (ase.getErrorCode().equals("ValidationException")) {
result = retryGetCredentialsForIdentity();
}
else {
throw ase;
}
}
com.amazonaws.services.cognitoidentity.model.Credentials credentials = result
.getCredentials();
sessionCredentials = new BasicSessionCredentials(credentials.getAccessKeyId(),
credentials.getSecretKey(), credentials.getSessionToken());
sessionCredentialsExpiration = credentials.getExpiration();
if (!result.getIdentityId().equals(getIdentityId())) {
setIdentityId(result.getIdentityId());
}
}
/**
* Gets the session credentials by requesting an OpenId Connect token from
* Amazon Cognito and then trading it with AWS Secure Token Service for the
* short lived session credentials.
*/
private void populateCredentialsWithSts(String token) {
boolean isAuthenticated = identityProvider.isAuthenticated();
String roleArn = (isAuthenticated) ? authRoleArn : unauthRoleArn;
AssumeRoleWithWebIdentityRequest sessionTokenRequest = new AssumeRoleWithWebIdentityRequest()
.withWebIdentityToken(token)
.withRoleArn(roleArn)
.withRoleSessionName("ProviderSession")
.withDurationSeconds(sessionDuration);
appendUserAgent(sessionTokenRequest, getUserAgent());
AssumeRoleWithWebIdentityResult sessionTokenResult = securityTokenService
.assumeRoleWithWebIdentity(sessionTokenRequest);
Credentials stsCredentials = sessionTokenResult.getCredentials();
sessionCredentials = new BasicSessionCredentials(
stsCredentials.getAccessKeyId(),
stsCredentials.getSecretAccessKey(),
stsCredentials.getSessionToken());
sessionCredentialsExpiration = stsCredentials.getExpiration();
}
/**
* Returns true if a new STS session needs to be started. A new STS session
* is needed when no session has been started yet, or if the last session is
* within the configured refresh threshold.
*
* @return True if a new STS session needs to be started.
*/
protected boolean needsNewSession() {
if (sessionCredentials == null) {
return true;
}
long currentTime = System.currentTimeMillis()
- SDKGlobalConfiguration.getGlobalTimeOffset() * 1000;
long timeRemaining = sessionCredentialsExpiration.getTime()
- currentTime;
return timeRemaining < (refreshThreshold * 1000);
}
/**
* Append user agent string to the request. The final string is what is set
* in the ClientCofniguration concatenated with the given userAgent string.
*
* @param request the request object to be appended
* @param userAgent additional user agent string to append
*/
private void appendUserAgent(AmazonWebServiceRequest request,
String userAgent) {
request.getRequestClientOptions().appendUserAgent(userAgent);
}
/**
* Gets the user agent string to append to all requests made by this
* provider. Default is an empty string.
*/
protected String getUserAgent() {
return "";
}
public void registerIdentityChangedListener(IdentityChangedListener listener) {
identityProvider.registerIdentityChangedListener(listener);
}
public void unregisterIdentityChangedListener(
IdentityChangedListener listener) {
identityProvider.unregisterIdentityChangedListener(listener);
}
}