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Core module for the gcloud-java.
/*
* Copyright 2015 Google Inc. All Rights Reserved.
*
* 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.google.cloud;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.auth.oauth2.AccessToken;
import com.google.auth.oauth2.GoogleCredentials;
import com.google.auth.oauth2.ServiceAccountCredentials;
import java.io.IOException;
import java.io.InputStream;
import java.io.Serializable;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.Signature;
import java.security.SignatureException;
import java.util.Collection;
import java.util.Date;
import java.util.Objects;
/**
* Credentials for accessing Google Cloud services.
*/
public abstract class AuthCredentials implements Restorable {
/**
* Represents built-in credentials when running in Google App Engine.
*/
public static class AppEngineAuthCredentials extends AuthCredentials
implements ServiceAccountSigner {
private static final AuthCredentials INSTANCE = new AppEngineAuthCredentials();
private static final AppEngineAuthCredentialsState STATE = new AppEngineAuthCredentialsState();
private AppEngineCredentials credentials;
private static class AppEngineCredentials extends GoogleCredentials
implements ServiceAccountSigner {
private final Object appIdentityService;
private final String account;
private final Method getAccessToken;
private final Method getAccessTokenResult;
private final Method getExpirationTime;
private final Method signForApp;
private final Method getSignature;
private final Collection scopes;
AppEngineCredentials() {
try {
Class factoryClass =
Class.forName("com.google.appengine.api.appidentity.AppIdentityServiceFactory");
Method method = factoryClass.getMethod("getAppIdentityService");
this.appIdentityService = method.invoke(null);
Class serviceClass =
Class.forName("com.google.appengine.api.appidentity.AppIdentityService");
Class tokenResultClass = Class.forName(
"com.google.appengine.api.appidentity.AppIdentityService$GetAccessTokenResult");
this.getAccessTokenResult = serviceClass.getMethod("getAccessToken", Iterable.class);
this.getAccessToken = tokenResultClass.getMethod("getAccessToken");
this.getExpirationTime = tokenResultClass.getMethod("getExpirationTime");
this.account = (String) serviceClass.getMethod("getServiceAccountName")
.invoke(appIdentityService);
this.signForApp = serviceClass.getMethod("signForApp", byte[].class);
Class signingResultClass = Class.forName(
"com.google.appengine.api.appidentity.AppIdentityService$SigningResult");
this.getSignature = signingResultClass.getMethod("getSignature");
this.scopes = null;
} catch (Exception e) {
throw new RuntimeException("Could not create AppEngineCredentials.", e);
}
}
AppEngineCredentials(Collection scopes, AppEngineCredentials unscoped) {
this.appIdentityService = unscoped.appIdentityService;
this.getAccessToken = unscoped.getAccessToken;
this.getAccessTokenResult = unscoped.getAccessTokenResult;
this.getExpirationTime = unscoped.getExpirationTime;
this.account = unscoped.account;
this.signForApp = unscoped.signForApp;
this.getSignature = unscoped.getSignature;
this.scopes = scopes;
}
/**
* Refresh the access token by getting it from the App Identity service.
*/
@Override
public AccessToken refreshAccessToken() throws IOException {
if (createScopedRequired()) {
throw new IOException("AppEngineCredentials requires createScoped call before use.");
}
try {
Object accessTokenResult = getAccessTokenResult.invoke(appIdentityService, scopes);
String accessToken = (String) getAccessToken.invoke(accessTokenResult);
Date expirationTime = (Date) getExpirationTime.invoke(accessTokenResult);
return new AccessToken(accessToken, expirationTime);
} catch (Exception e) {
throw new IOException("Could not get the access token.", e);
}
}
@Override
public boolean createScopedRequired() {
return scopes == null || scopes.isEmpty();
}
@Override
public GoogleCredentials createScoped(Collection scopes) {
return new AppEngineCredentials(scopes, this);
}
@Override
public String account() {
return account;
}
@Override
public byte[] sign(byte[] toSign) {
try {
Object signingResult = signForApp.invoke(appIdentityService, toSign);
return (byte[]) getSignature.invoke(signingResult);
} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException ex) {
throw new SigningException("Failed to sign the provided bytes", ex);
}
}
}
private static class AppEngineAuthCredentialsState
implements RestorableState, Serializable {
private static final long serialVersionUID = 3558563960848658928L;
@Override
public AuthCredentials restore() {
return INSTANCE;
}
@Override
public int hashCode() {
return getClass().getName().hashCode();
}
@Override
public boolean equals(Object obj) {
return obj instanceof AppEngineAuthCredentialsState;
}
}
@Override
public AppEngineCredentials credentials() {
if (credentials == null) {
credentials = new AppEngineCredentials();
}
return credentials;
}
@Override
public RestorableState capture() {
return STATE;
}
@Override
public String account() {
return credentials().account();
}
@Override
public byte[] sign(byte[] toSign) {
return credentials().sign(toSign);
}
}
/**
* Represents service account credentials.
*
* @see
* User accounts and service accounts
*/
public static class ServiceAccountAuthCredentials extends AuthCredentials
implements ServiceAccountSigner {
private final ServiceAccountCredentials credentials;
private final String account;
private final PrivateKey privateKey;
private static class ServiceAccountAuthCredentialsState
implements RestorableState, Serializable {
private static final long serialVersionUID = -7302180782414633639L;
private final String account;
private final PrivateKey privateKey;
private ServiceAccountAuthCredentialsState(String account, PrivateKey privateKey) {
this.account = account;
this.privateKey = privateKey;
}
@Override
public AuthCredentials restore() {
return new ServiceAccountAuthCredentials(account, privateKey);
}
@Override
public int hashCode() {
return Objects.hash(account, privateKey);
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof ServiceAccountAuthCredentialsState)) {
return false;
}
ServiceAccountAuthCredentialsState other = (ServiceAccountAuthCredentialsState) obj;
return Objects.equals(account, other.account)
&& Objects.equals(privateKey, other.privateKey);
}
}
ServiceAccountAuthCredentials(String account, PrivateKey privateKey) {
this(new ServiceAccountCredentials(null, account, privateKey, null, null));
}
ServiceAccountAuthCredentials(ServiceAccountCredentials credentials) {
this.credentials = checkNotNull(credentials);
this.account = checkNotNull(credentials.getClientEmail());
this.privateKey = checkNotNull(credentials.getPrivateKey());
}
@Override
public ServiceAccountCredentials credentials() {
return credentials;
}
@Override
public String account() {
return account;
}
/**
* Returns the private key associated with the service account credentials.
*/
public PrivateKey privateKey() {
return privateKey;
}
@Override
public byte[] sign(byte[] toSign) {
try {
Signature signer = Signature.getInstance("SHA256withRSA");
signer.initSign(privateKey());
signer.update(toSign);
return signer.sign();
} catch (NoSuchAlgorithmException | InvalidKeyException | SignatureException ex) {
throw new SigningException("Failed to sign the provided bytes", ex);
}
}
@Override
public RestorableState capture() {
return new ServiceAccountAuthCredentialsState(account, privateKey);
}
}
/**
* Represents Application Default Credentials, which are credentials that are inferred from the
* runtime environment.
*
* @see
* Google Application Default Credentials
*/
public static class ApplicationDefaultAuthCredentials extends AuthCredentials {
private GoogleCredentials googleCredentials;
private static final ApplicationDefaultAuthCredentialsState STATE =
new ApplicationDefaultAuthCredentialsState();
private static class ApplicationDefaultAuthCredentialsState
implements RestorableState, Serializable {
private static final long serialVersionUID = -8839085552021212257L;
@Override
public AuthCredentials restore() {
try {
return new ApplicationDefaultAuthCredentials();
} catch (IOException e) {
throw new IllegalStateException(
"Could not restore " + ApplicationDefaultAuthCredentials.class.getSimpleName(), e);
}
}
@Override
public int hashCode() {
return getClass().getName().hashCode();
}
@Override
public boolean equals(Object obj) {
return obj instanceof ApplicationDefaultAuthCredentialsState;
}
}
ApplicationDefaultAuthCredentials(GoogleCredentials credentials) {
googleCredentials = credentials;
}
ApplicationDefaultAuthCredentials() throws IOException {
googleCredentials = GoogleCredentials.getApplicationDefault();
}
@Override
public GoogleCredentials credentials() {
return googleCredentials;
}
@Override
public RestorableState capture() {
return STATE;
}
}
/**
* Represents OAuth2 credentials. These credentials can be created given an OAuth2 access token.
* The access token will not be automatically refreshed.
*/
public static class OAuth2AuthCredentials extends AuthCredentials {
private final GoogleCredentials credentials;
private final String accessToken;
private final Date expirationTime;
private static class OAuth2AuthCredentialsState
implements RestorableState, Serializable {
private static final long serialVersionUID = -7760693952274496205L;
private final String accessToken;
private final Date expirationTime;
private OAuth2AuthCredentialsState(String accessToken, Date expirationTime) {
this.accessToken = accessToken;
this.expirationTime = expirationTime;
}
@Override
public AuthCredentials restore() {
return new OAuth2AuthCredentials(accessToken, expirationTime);
}
@Override
public int hashCode() {
return Objects.hash(accessToken, expirationTime);
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof OAuth2AuthCredentialsState)) {
return false;
}
OAuth2AuthCredentialsState other = (OAuth2AuthCredentialsState) obj;
return Objects.equals(accessToken, other.accessToken)
&& Objects.equals(expirationTime, other.expirationTime);
}
}
OAuth2AuthCredentials(String accessToken, Date expirationTime) {
this.accessToken = checkNotNull(accessToken);
this.expirationTime = expirationTime;
this.credentials = new GoogleCredentials(new AccessToken(accessToken, expirationTime));
}
@Override
public GoogleCredentials credentials() {
return credentials;
}
@Override
public RestorableState capture() {
return new OAuth2AuthCredentialsState(accessToken, expirationTime);
}
}
/**
* A placeholder for credentials to signify that requests sent to the server should not be
* authenticated. This is typically useful when using the local service emulators, such as
* {@code LocalDatastoreHelper} and {@code LocalResourceManagerHelper}.
*/
public static class NoAuthCredentials extends AuthCredentials {
private static final AuthCredentials INSTANCE = new NoAuthCredentials();
private static final NoAuthCredentialsState STATE = new NoAuthCredentialsState();
private static class NoAuthCredentialsState
implements RestorableState, Serializable {
private static final long serialVersionUID = -4022100563954640465L;
@Override
public AuthCredentials restore() {
return INSTANCE;
}
@Override
public int hashCode() {
return getClass().getName().hashCode();
}
@Override
public boolean equals(Object obj) {
return obj instanceof NoAuthCredentialsState;
}
}
private NoAuthCredentials() {}
@Override
public GoogleCredentials credentials() {
return null;
}
@Override
public RestorableState capture() {
return STATE;
}
}
public abstract GoogleCredentials credentials();
public static AuthCredentials createForAppEngine() {
return AppEngineAuthCredentials.INSTANCE;
}
/**
* Returns the Application Default Credentials.
*
* Returns the Application Default Credentials which are credentials that identify and
* authorize the whole application. This is the built-in service account if running on
* Google Compute Engine or the credentials file can be read from the path in the environment
* variable GOOGLE_APPLICATION_CREDENTIALS.
*
*
* @return the credentials instance
* @throws IOException if the credentials cannot be created in the current environment
*/
public static AuthCredentials createApplicationDefaults() throws IOException {
GoogleCredentials credentials = GoogleCredentials.getApplicationDefault();
if (credentials instanceof ServiceAccountCredentials) {
ServiceAccountCredentials serviceAccountCredentials = (ServiceAccountCredentials) credentials;
return new ServiceAccountAuthCredentials(serviceAccountCredentials);
}
return new ApplicationDefaultAuthCredentials(credentials);
}
/**
* Creates Service Account Credentials given an account id and a private key.
*
* For details on how to obtain Service Account Credentials see
* Service
* Account Authentication.
*
*
* @param account id of the Service Account
* @param privateKey private key associated to the account
* @return the credentials instance
*/
public static ServiceAccountAuthCredentials createFor(String account, PrivateKey privateKey) {
return new ServiceAccountAuthCredentials(account, privateKey);
}
/**
* Creates OAuth2 Credentials given the string representation of an access token. The access token
* will not be automatically refreshed.
*
* @param accessToken string representation of an access token
* @return the credentials instance
*/
public static OAuth2AuthCredentials createFor(String accessToken) {
return createFor(accessToken, (Date) null);
}
/**
* Creates OAuth2 Credentials given the string representation of an access token and its
* expiration time. The access token will not be automatically refreshed.
*
* @param accessToken string representation of an access token
* @return the credentials instance
*/
public static OAuth2AuthCredentials createFor(String accessToken, Date expirationTime) {
return new OAuth2AuthCredentials(accessToken, expirationTime);
}
/**
* Creates a placeholder denoting that no credentials should be used. This is typically useful
* when using the local service emulators, such as {@code LocalDatastoreHelper} and
* {@code LocalResourceManagerHelper}.
*/
public static AuthCredentials noAuth() {
return NoAuthCredentials.INSTANCE;
}
/**
* Creates Service Account Credentials given a stream for credentials in JSON format.
*
* For details on how to obtain Service Account Credentials in JSON format see
* Service
* Account Authentication.
*
*
* @param jsonCredentialStream stream for Service Account Credentials in JSON format
* @return the credentials instance
* @throws IOException if the credentials cannot be created from the stream
*/
public static ServiceAccountAuthCredentials createForJson(InputStream jsonCredentialStream)
throws IOException {
GoogleCredentials tempCredentials = GoogleCredentials.fromStream(jsonCredentialStream);
if (tempCredentials instanceof ServiceAccountCredentials) {
ServiceAccountCredentials tempServiceAccountCredentials =
(ServiceAccountCredentials) tempCredentials;
return new ServiceAccountAuthCredentials(
tempServiceAccountCredentials.getClientEmail(),
tempServiceAccountCredentials.getPrivateKey());
}
throw new IOException(
"The given JSON Credentials Stream is not for a service account credential.");
}
}
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