com.eucalyptus.auth.tokens.SecurityTokenAWSCredentialsProvider.java Source code

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Here is the source code for com.eucalyptus.auth.tokens.SecurityTokenAWSCredentialsProvider.java

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/*************************************************************************
 * Copyright 2009-2015 Eucalyptus Systems, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 3 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/.
 *
 * Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
 * CA 93117, USA or visit http://www.eucalyptus.com/licenses/ if you need
 * additional information or have any questions.
 ************************************************************************/
package com.eucalyptus.auth.tokens;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.auth.BasicSessionCredentials;
import com.eucalyptus.auth.Accounts;
import com.eucalyptus.auth.AuthException;
import com.eucalyptus.auth.principal.AccountFullName;
import com.eucalyptus.auth.principal.User;
import com.eucalyptus.util.Exceptions;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;

/**
 *
 */
public class SecurityTokenAWSCredentialsProvider implements AWSCredentialsProvider {

    private static final int DEFAULT_EXPIRATION_SECS = 900;
    private static final int DEFAULT_PRE_EXPIRY_SECS = 60;

    private final AtomicReference<Supplier<AWSCredentials>> credentialsSupplier = new AtomicReference<>();
    private final Supplier<User> user;
    private final int expirationSecs;
    private final int preExpirySecs;

    public SecurityTokenAWSCredentialsProvider(final AccountFullName accountFullName) {
        this(new Supplier<User>() {
            @Override
            public User get() {
                try {
                    return Accounts.lookupPrincipalByAccountNumber(accountFullName.getAccountNumber());
                } catch (AuthException e) {
                    throw Exceptions.toUndeclared(e);
                }
            }
        });
    }

    public SecurityTokenAWSCredentialsProvider(final User user) {
        this(Suppliers.ofInstance(user));
    }

    public SecurityTokenAWSCredentialsProvider(final Supplier<User> user) {
        this(user, DEFAULT_EXPIRATION_SECS);
    }

    public SecurityTokenAWSCredentialsProvider(final Supplier<User> user, final int expirationSecs) {
        this(user, Math.max(expirationSecs, DEFAULT_PRE_EXPIRY_SECS * 2), DEFAULT_PRE_EXPIRY_SECS);
    }

    public SecurityTokenAWSCredentialsProvider(final User user, final int expirationSecs, final int preExpirySecs) {
        this(Suppliers.ofInstance(user), expirationSecs, preExpirySecs);
    }

    public SecurityTokenAWSCredentialsProvider(final Supplier<User> user, final int expirationSecs,
            final int preExpirySecs) {
        this.user = user;
        this.expirationSecs = Math.max(expirationSecs, DEFAULT_PRE_EXPIRY_SECS * 2);
        this.preExpirySecs = preExpirySecs;
        refresh();
    }

    @Override
    public AWSCredentials getCredentials() {
        return credentialsSupplier.get().get();
    }

    @Override
    public void refresh() {
        credentialsSupplier.set(refreshCredentialsSupplier());
    }

    private Supplier<AWSCredentials> refreshCredentialsSupplier() {
        return Suppliers.memoizeWithExpiration(new Supplier<AWSCredentials>() {
            @Override
            public AWSCredentials get() {
                try {
                    final SecurityToken securityToken = SecurityTokenManager.issueSecurityToken(user.get(),
                            expirationSecs);
                    return new BasicSessionCredentials(securityToken.getAccessKeyId(), securityToken.getSecretKey(),
                            securityToken.getToken());
                } catch (final AuthException e) {
                    throw Exceptions.toUndeclared(e);
                }
            }
        }, expirationSecs - preExpirySecs, TimeUnit.SECONDS);
    }
}