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/*
* Copyright (C) 2009-2010, Google Inc. and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.http.server;
import static javax.servlet.http.HttpServletResponse.SC_FORBIDDEN;
import static javax.servlet.http.HttpServletResponse.SC_UNAUTHORIZED;
import static org.eclipse.jgit.http.server.GitSmartHttpTools.infoRefsResultType;
import static org.eclipse.jgit.http.server.GitSmartHttpTools.sendError;
import static org.eclipse.jgit.http.server.ServletUtils.ATTRIBUTE_HANDLER;
import static org.eclipse.jgit.http.server.ServletUtils.getRepository;
import java.io.IOException;
import java.util.List;
import javax.servlet.Filter;
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 javax.servlet.http.HttpServletResponse;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.transport.PacketLineOut;
import org.eclipse.jgit.transport.RefAdvertiser.PacketLineOutRefAdvertiser;
import org.eclipse.jgit.transport.ServiceMayNotContinueException;
import org.eclipse.jgit.transport.resolver.ServiceNotAuthorizedException;
import org.eclipse.jgit.transport.resolver.ServiceNotEnabledException;
/** Filter in front of {@link InfoRefsServlet} to catch smart service requests. */
abstract class SmartServiceInfoRefs implements Filter {
private final String svc;
private final Filter[] filters;
SmartServiceInfoRefs(String service, List<Filter> filters) {
this.svc = service;
this.filters = filters.toArray(new Filter[0]);
}
/** {@inheritDoc} */
@Override
public void init(FilterConfig config) throws ServletException {
// Do nothing.
}
/** {@inheritDoc} */
@Override
public void destroy() {
// Do nothing.
}
/** {@inheritDoc} */
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
final HttpServletRequest req = (HttpServletRequest) request;
final HttpServletResponse res = (HttpServletResponse) response;
if (svc.equals(req.getParameter("service"))) {
final Repository db = getRepository(req);
try {
begin(req, db);
} catch (ServiceNotAuthorizedException e) {
res.sendError(SC_UNAUTHORIZED, e.getMessage());
return;
} catch (ServiceNotEnabledException e) {
sendError(req, res, SC_FORBIDDEN, e.getMessage());
return;
}
try {
if (filters.length == 0)
service(req, response);
else
new Chain().doFilter(request, response);
} finally {
req.removeAttribute(ATTRIBUTE_HANDLER);
}
} else {
chain.doFilter(request, response);
}
}
private void service(ServletRequest request, ServletResponse response)
throws IOException {
final HttpServletRequest req = (HttpServletRequest) request;
final HttpServletResponse res = (HttpServletResponse) response;
final SmartOutputStream buf = new SmartOutputStream(req, res, true);
try {
res.setContentType(infoRefsResultType(svc));
final PacketLineOut out = new PacketLineOut(buf);
respond(req, out, svc);
buf.close();
} catch (ServiceNotAuthorizedException e) {
res.sendError(SC_UNAUTHORIZED, e.getMessage());
} catch (ServiceNotEnabledException e) {
sendError(req, res, SC_FORBIDDEN, e.getMessage());
} catch (ServiceMayNotContinueException e) {
if (e.isOutput())
buf.close();
else
sendError(req, res, e.getStatusCode(), e.getMessage());
}
}
/**
* Begin service.
*
* @param req
* request
* @param db
* repository
* @throws IOException
* @throws ServiceNotEnabledException
* @throws ServiceNotAuthorizedException
*/
protected abstract void begin(HttpServletRequest req, Repository db)
throws IOException, ServiceNotEnabledException,
ServiceNotAuthorizedException;
/**
* Advertise.
*
* @param req
* request
* @param pck
* @throws IOException
* @throws ServiceNotEnabledException
* @throws ServiceNotAuthorizedException
*/
protected abstract void advertise(HttpServletRequest req,
PacketLineOutRefAdvertiser pck) throws IOException,
ServiceNotEnabledException, ServiceNotAuthorizedException;
/**
* Writes the appropriate response to an info/refs request received by
* a smart service. In protocol v0, this starts with "#
* service=serviceName" followed by a flush packet, but this is not
* necessarily the case in other protocol versions.
* <p>
* The default implementation writes "# service=serviceName" and a
* flush packet, then calls {@link #advertise}. Subclasses should
* override this method if they support protocol versions other than
* protocol v0.
*
* @param req
* request
* @param pckOut
* destination of response
* @param serviceName
* service name to be written out in protocol v0; may or may
* not be used in other versions
* @throws IOException
* @throws ServiceNotEnabledException
* @throws ServiceNotAuthorizedException
*/
protected void respond(HttpServletRequest req,
PacketLineOut pckOut, String serviceName)
throws IOException, ServiceNotEnabledException,
ServiceNotAuthorizedException {
pckOut.writeString("# service=" + svc + '\n'); //$NON-NLS-1$
pckOut.end();
advertise(req, new PacketLineOutRefAdvertiser(pckOut));
}
private class Chain implements FilterChain {
private int filterIdx;
@Override
public void doFilter(ServletRequest req, ServletResponse rsp)
throws IOException, ServletException {
if (filterIdx < filters.length)
filters[filterIdx++].doFilter(req, rsp, this);
else
service(req, rsp);
}
}
}
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