/**
* Copyright (C) 2012-2017 the original author or authors.
*
* 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 ninja;
import java.nio.charset.Charset;
import ninja.utils.NinjaConstant;
import ninja.utils.NinjaProperties;
import org.apache.commons.codec.binary.Base64;
import com.google.inject.Inject;
/**
* A Ninja filter that implements HTTP BASIC Authentication.
*
* @author James Moger
*
*/
public class BasicAuthFilter implements Filter {
protected final Ninja ninja;
protected final UsernamePasswordValidator credentialsValidator;
protected final String challenge;
protected final String realm;
@Inject
public BasicAuthFilter(Ninja ninja,
NinjaProperties ninjaProperties,
UsernamePasswordValidator validator) {
this.ninja = ninja;
this.credentialsValidator = validator;
this.realm = ninjaProperties.getWithDefault(
NinjaConstant.applicationName, "Ninja");
this.challenge = "Basic realm=\"" + realm + "\"";
}
@Override
public Result filter(FilterChain chain, Context context) {
if (context.getSession() == null) {
// no session
return ninja.getUnauthorizedResult(context);
} else if (context.getSession().get(SecureFilter.USERNAME) == null) {
// no login, conditionally challenge
String header = context.getHeader("Authorization");
if (header != null && header.startsWith("Basic")) {
// Authorization: Basic BASE64PACKET
String packet = header.substring("Basic".length()).trim();
String credentials = new String(Base64.decodeBase64(packet),
Charset.forName(NinjaConstant.UTF_8));
// credentials = username:password
final String[] values = credentials.split(":", 2);
final String username = values[0];
final String password = values[1];
if (credentialsValidator
.validateCredentials(username, password)) {
context.getSession().put(SecureFilter.USERNAME, username);
return chain.next(context);
}
}
Result result = ninja.getUnauthorizedResult(context).addHeader(
Result.WWW_AUTHENTICATE, challenge);
return result;
} else {
return chain.next(context);
}
}
}