/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.synapse.securevault;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.synapse.securevault.secret.SecretCallback;
import org.apache.synapse.securevault.secret.SecretCallbackHandler;
import org.apache.synapse.securevault.secret.SecretLoadingModule;
import org.apache.synapse.securevault.secret.SingleSecretCallback;
import java.util.ArrayList;
/**
* Responsible for resolving secrets such as password. The secrets this SecretResolver should be
* resolved , can be given as protected Tokens and the use of this class can explicitly check
* whether a token is protected.
*/
public class SecretResolver {
private static Log log = LogFactory.getLog(SecretResolver.class);
private boolean initialized = false;
private final ArrayList<String> protectedTokens = new ArrayList<String>();
private SecretLoadingModule secretLoadingModule;
private final static String DEFAULT_PROMPT = "password > ";
/**
* Initializes by giving an instance of <code>SecretCallbackHandler </code> to be used to
* retrieve secrets
*
* @param secretCallbackHandler <code>SecretCallbackHandler </code> instance
*/
public void init(SecretCallbackHandler secretCallbackHandler) {
if (initialized) {
if (log.isDebugEnabled()) {
log.debug("SecretResolver already has been started.");
}
return;
}
if (secretCallbackHandler == null) {
throw new SecureVaultException("SecretResolver cannot be initialized. " +
"The provided SecretCallbackHandler is null", log);
}
this.secretLoadingModule = new SecretLoadingModule();
this.secretLoadingModule.init(new SecretCallbackHandler[]{secretCallbackHandler});
this.initialized = true;
}
/**
* Resolved given password using an instance of a PasswordProvider
*
* @param encryptedPassword Encrypted password
* @return resolved password
*/
public String resolve(String encryptedPassword) {
return resolve(encryptedPassword, DEFAULT_PROMPT);
}
/**
* Resolved given password using an instance of a PasswordProvider
*
* @param encryptedPassword Encrypted password
* @param prompt to be used to interact with user
* @return resolved password
*/
public String resolve(String encryptedPassword, String prompt) {
assertInitialized();
if (encryptedPassword == null || "".equals(encryptedPassword)) {
if (log.isDebugEnabled()) {
log.debug("Given Encrypted Password is empty or null. Returning itself");
}
return encryptedPassword;
}
SingleSecretCallback secretCallback = new SingleSecretCallback(encryptedPassword);
secretCallback.setPrompt(prompt);
secretLoadingModule.load(new SecretCallback[]{secretCallback});
String plainText = secretCallback.getSecret();
return plainText;
}
/**
* Registers a token as a Protected Token
*
* @param token <code>String</code> representation of a token
*/
public void addProtectedToken(String token) {
assertInitialized();
if (token != null && !"".equals(token)) {
protectedTokens.add(token.trim());
}
}
/**
* Checks whether a token is a Protected Token
*
* @param token <code>String</code> representation of a token
* @return <code>true</code> if the token is a Protected Token
*/
public boolean isTokenProtected(String token) {
assertInitialized();
return token != null && !"".equals(token) && protectedTokens.contains(token.trim());
}
/**
* Checks the state of the rule engine.
* It is recommended to check state of the this component prior to access any methods of this
*
* @return <code>true<code> if the rule engine has been initialized
*/
public boolean isInitialized() {
return initialized;
}
private void assertInitialized() {
if (!initialized) {
throw new SecureVaultException("SecretResolver has not been initialized, " +
"it requires to be initialized, with the required " +
"configurations before starting", log);
}
}
/**
* Shutdown the secret resolver
*/
public void shutDown() {
initialized = false;
secretLoadingModule = null;
protectedTokens.clear();
}
}