/*
* Copyright (C)2009 - SSHJ Contributors
*
* 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 net.schmizz.sshj.userauth.method;
import net.schmizz.sshj.common.LoggerFactory;
import net.schmizz.sshj.userauth.password.PasswordFinder;
import net.schmizz.sshj.userauth.password.Resource;
import org.slf4j.Logger;
import java.util.Collections;
import java.util.List;
import java.util.regex.Pattern;
public class PasswordResponseProvider
implements ChallengeResponseProvider {
public static final Pattern DEFAULT_PROMPT_PATTERN = Pattern.compile(".*[pP]assword:\\s?\\z", Pattern.DOTALL);
private static final char[] EMPTY_RESPONSE = new char[0];
private final Pattern promptPattern;
private final PasswordFinder pwdf;
private final Logger log;
private Resource resource;
public PasswordResponseProvider(PasswordFinder pwdf) {
this(pwdf, DEFAULT_PROMPT_PATTERN);
}
public PasswordResponseProvider(PasswordFinder pwdf, Pattern promptPattern) {
this(pwdf, promptPattern, LoggerFactory.DEFAULT);
}
public PasswordResponseProvider(PasswordFinder pwdf, Pattern promptPattern, LoggerFactory loggerFactory) {
this.pwdf = pwdf;
this.promptPattern = promptPattern;
log = loggerFactory.getLogger(getClass());
}
@Override
public List<String> getSubmethods() {
return Collections.emptyList();
}
@Override
public void init(Resource resource, String name, String instruction) {
this.resource = resource;
log.debug("Challenge - name=`{}`; instruction=`{}`", name, instruction);
}
@Override
public char[] getResponse(String prompt, boolean echo) {
if (!echo && promptPattern.matcher(prompt).matches()) {
return pwdf.reqPassword(resource);
}
return EMPTY_RESPONSE;
}
@Override
public boolean shouldRetry() {
return pwdf.shouldRetry(resource);
}
}