nl.topicus.jdbc.shaded.com.google.auth.oauth2.OAuth2Credentials Maven / Gradle / Ivy
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/*
* Copyright 2015, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package nl.topicus.jdbc.shaded.com.google.auth.oauth2;
import nl.topicus.jdbc.shaded.com.google.api.client.util.Clock;
import nl.topicus.jdbc.shaded.com.google.auth.Credentials;
import nl.topicus.jdbc.shaded.com.google.auth.RequestMetadataCallback;
import nl.topicus.jdbc.shaded.com.google.auth.http.AuthHttpConstants;
import nl.topicus.jdbc.shaded.com.google.nl.topicus.jdbc.shaded.com.on.annotations.VisibleForTesting;
import nl.topicus.jdbc.shaded.com.google.nl.topicus.jdbc.shaded.com.on.base.MoreObjects;
import nl.topicus.jdbc.shaded.com.google.nl.topicus.jdbc.shaded.com.on.base.MoreObjects.ToStringHelper;
import nl.topicus.jdbc.shaded.com.google.nl.topicus.jdbc.shaded.com.on.base.Preconditions;
import nl.topicus.jdbc.shaded.com.google.nl.topicus.jdbc.shaded.com.on.collect.Iterables;
import java.nl.topicus.jdbc.shaded.io.IOException;
import java.nl.topicus.jdbc.shaded.io.ObjectInputStream;
import java.nl.topicus.jdbc.shaded.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.ServiceLoader;
import java.util.concurrent.Executor;
/**
* Base type for Credentials using OAuth2.
*/
public class OAuth2Credentials extends Credentials {
private static final long serialVersionUID = 4556936364828217687L;
private static final long MINIMUM_TOKEN_MILLISECONDS = 60000L * 5L;
// byte[] is serializable, so the lock variable can be final
private final Object lock = new byte[0];
private Map> requestMetadata;
private AccessToken temporaryAccess;
// Change listeners are not serialized
private transient List changeListeners;
// Until we expose this to the users it can remain transient and non-serializable
@VisibleForTesting
transient Clock clock = Clock.SYSTEM;
/**
* Default constructor.
**/
protected OAuth2Credentials() {
this(null);
}
/**
* Constructor with explicit access token.
*
* @param accessToken Initial or temporary access token.
**/
public OAuth2Credentials(AccessToken accessToken) {
if (accessToken != null) {
useAccessToken(accessToken);
}
}
@Override
public String getAuthenticationType() {
return "OAuth2";
}
@Override
public boolean hasRequestMetadata() {
return true;
}
@Override
public boolean hasRequestMetadataOnly() {
return true;
}
public final AccessToken getAccessToken() {
return temporaryAccess;
}
@Override
public void getRequestMetadata(final URI uri, Executor executor,
final RequestMetadataCallback callback) {
Map> metadata;
synchronized(lock) {
if (shouldRefresh()) {
// The base class implementation will do a blocking get in the executor.
super.getRequestMetadata(uri, executor, callback);
return;
}
metadata = Preconditions.checkNotNull(requestMetadata, "cached requestMetadata");
}
callback.onSuccess(metadata);
}
/**
* Provide the request metadata by ensuring there is a current access token and providing it
* as an authorization bearer token.
*/
@Override
public Map> getRequestMetadata(URI uri) throws IOException {
synchronized(lock) {
if (shouldRefresh()) {
refresh();
}
return Preconditions.checkNotNull(requestMetadata, "requestMetadata");
}
}
/**
* Refresh the token by discarding the cached token and metadata and requesting the new ones.
*/
@Override
public void refresh() throws IOException {
synchronized(lock) {
requestMetadata = null;
temporaryAccess = null;
useAccessToken(Preconditions.checkNotNull(refreshAccessToken(), "new access token"));
if (changeListeners != null) {
for (CredentialsChangedListener listener : changeListeners) {
listener.onChanged(this);
}
}
}
}
// Must be called under lock
private void useAccessToken(AccessToken token) {
this.temporaryAccess = token;
this.requestMetadata = Collections.singletonMap(
AuthHttpConstants.AUTHORIZATION,
Collections.singletonList(OAuth2Utils.BEARER_PREFIX + token.getTokenValue()));
}
// Must be called under lock
// requestMetadata will never be null if false is returned.
private boolean shouldRefresh() {
Long expiresIn = getExpiresInMilliseconds();
return requestMetadata == null || expiresIn != null && expiresIn <= MINIMUM_TOKEN_MILLISECONDS;
}
/**
* Method to refresh the access token according to the specific type of credentials.
*
* Throws IllegalStateException if not overridden since direct use of OAuth2Credentials is only
* for temporary or non-refreshing access tokens.
*
* @throws IOException from derived implementations
*/
public AccessToken refreshAccessToken() throws IOException {
throw new IllegalStateException("OAuth2Credentials instance does not support refreshing the"
+ " access token. An instance with a new access token should be used, or a derived type"
+ " that supports refreshing.");
}
/**
* Adds a listener that is notified when the Credentials data changes.
*
* This is called when token content changes, such as when the access token is refreshed. This
* is typically used by code caching the access token.
*
* @param listener The listener to be added.
*/
public final void addChangeListener(CredentialsChangedListener listener) {
synchronized(lock) {
if (changeListeners == null) {
changeListeners = new ArrayList<>();
}
changeListeners.add(listener);
}
}
/**
* Return the remaining time the current access token will be valid, or null if there is no
* token or expiry information. Must be called under lock.
*/
private Long getExpiresInMilliseconds() {
if (temporaryAccess == null) {
return null;
}
Date expirationTime = temporaryAccess.getExpirationTime();
if (expirationTime == null) {
return null;
}
return (expirationTime.getTime() - clock.currentTimeMillis());
}
/**
* Listener for changes to credentials.
*
*
This is called when token content changes, such as when the access token is refreshed. This
* is typically used by code caching the access token.
*/
public interface CredentialsChangedListener {
/**
* Notifies that the credentials have changed.
*
*
This is called when token content changes, such as when the access token is refreshed.
* This is typically used by code caching the access token.
*
* @param credentials The updated credentials instance
* @throws IOException My be thrown by listeners if saving credentials fails.
*/
void onChanged(OAuth2Credentials credentials) throws IOException;
}
@Override
public int hashCode() {
return Objects.hash(requestMetadata, temporaryAccess);
}
protected ToStringHelper toStringHelper() {
return MoreObjects.toStringHelper(this)
.add("requestMetadata", requestMetadata)
.add("temporaryAccess", temporaryAccess);
}
@Override
public String toString() {
return toStringHelper().toString();
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof OAuth2Credentials)) {
return false;
}
OAuth2Credentials other = (OAuth2Credentials) obj;
return Objects.equals(this.requestMetadata, other.requestMetadata)
&& Objects.equals(this.temporaryAccess, other.temporaryAccess);
}
private void readObject(ObjectInputStream input) throws IOException, ClassNotFoundException {
input.defaultReadObject();
clock = Clock.SYSTEM;
}
@SuppressWarnings("unchecked")
protected static T newInstance(String className) throws IOException, ClassNotFoundException {
try {
return (T) Class.forName(className).newInstance();
} catch (InstantiationException | IllegalAccessException e) {
throw new IOException(e);
}
}
protected static T getFromServiceLoader(Class clazz, T defaultInstance) {
return Iterables.getFirst(ServiceLoader.load(clazz), defaultInstance);
}
}