/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. 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. For additional information regarding
* copyright in this work, please see the NOTICE file in the top level
* directory of this distribution.
*/
package org.apache.abdera.security.util.servlet;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.security.Provider;
import java.security.Security;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import org.apache.abdera.model.Document;
import org.apache.abdera.model.Element;
import org.apache.abdera.security.Encryption;
import org.apache.abdera.security.EncryptionOptions;
import org.apache.abdera.security.SecurityException;
public abstract class AbstractEncryptedRequestFilter
extends SecurityFilter {
// The methods that allow encrypted bodies
protected final List<String> methods = new ArrayList<String>();
protected AbstractEncryptedRequestFilter() {
this("POST","PUT");
}
protected AbstractEncryptedRequestFilter(String... methods) {
for (String method: methods) this.methods.add(method);
}
protected void initProvider() {}
protected void addProvider(Provider provider) {
if (Security.getProvider(provider.getName()) == null)
Security.addProvider(provider);
}
@Override
public void init(FilterConfig config) throws ServletException {
super.init(config);
initProvider();
String s = config.getInitParameter("methods");
if (s != null && s.length() > 0) {
this.methods.clear();
String[] methods = s.split("\\s*,\\s*");
for (String method : methods) this.methods.add(method);
}
}
@SuppressWarnings("unchecked")
public void doFilter(
ServletRequest request,
ServletResponse response,
FilterChain chain)
throws IOException,
ServletException {
bootstrap(request,response);
HttpServletRequest req = (HttpServletRequest) request;
String method = req.getMethod();
if (methods.contains(method.toUpperCase())) {
BufferedRequestWrapper wrapper =
new BufferedRequestWrapper((HttpServletRequest) request);
try {
Document<Element> doc = getDocument(wrapper);
if (doc != null) {
Encryption enc = security.getEncryption();
if (enc.isEncrypted(doc)) {
Object arg = initArg(request);
EncryptionOptions options = initEncryptionOptions(request,response,enc,arg);
doDecryption(doc, options, enc, wrapper);
}
}
} catch (Exception e) {
} finally {wrapper.reset();}
request = wrapper;
}
chain.doFilter(request, response);
}
protected void doDecryption(
Document doc,
EncryptionOptions options,
Encryption enc,
BufferedRequestWrapper wrapper)
throws SecurityException, IOException {
doc = enc.decrypt(doc, options);
ByteArrayOutputStream out = new ByteArrayOutputStream();
doc.writeTo(out);
ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
wrapper.setInputStream(in);
}
protected abstract void bootstrap(ServletRequest request, ServletResponse response);
protected abstract Object initArg(ServletRequest request);
protected abstract EncryptionOptions initEncryptionOptions(
ServletRequest request,
ServletResponse response,
Encryption encryption,
Object arg);
}