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Git aware HTTP server implementation.
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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 jakarta.servlet.http.HttpServletResponse.SC_FORBIDDEN;
import static jakarta.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 jakarta.servlet.Filter;
import jakarta.servlet.FilterChain;
import jakarta.servlet.FilterConfig;
import jakarta.servlet.ServletException;
import jakarta.servlet.ServletRequest;
import jakarta.servlet.ServletResponse;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.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 filters) {
		this.svc = service;
		this.filters = filters.toArray(new Filter[0]);
	}

	@Override
	public void init(FilterConfig config) throws ServletException {
		// Do nothing.
	}

	@Override
	public void destroy() {
		// Do nothing.
	}

	@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
	 *             if an IO error occurred
	 * @throws ServiceNotEnabledException
	 *             if a service is not available
	 * @throws ServiceNotAuthorizedException
	 *             if service requires authentication and the current user
	 *             didn't provide credentials
	 */
	protected abstract void begin(HttpServletRequest req, Repository db)
			throws IOException, ServiceNotEnabledException,
			ServiceNotAuthorizedException;

	/**
	 * Advertise.
	 *
	 * @param req
	 *            request
	 * @param pck
	 *            used to frame lines in PacketLineOut format
	 * @throws IOException
	 *             if an IO error occurred
	 * @throws ServiceNotEnabledException
	 *             if a service is not available
	 * @throws ServiceNotAuthorizedException
	 *             if service requires authentication and the current user
	 *             didn't provide credentials
	 */
	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.
	 * 
	 * 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
	 *             if an IO error occurred
	 * @throws ServiceNotEnabledException
	 *             if a service is not available
	 * @throws ServiceNotAuthorizedException
	 *             if service requires authentication and the current user
	 *             didn't provide credentials
	 */
	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);
		}
	}
}