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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.glue;
-
- import java.io.IOException;
- import java.text.MessageFormat;
- import java.util.AbstractSet;
- import java.util.ArrayList;
- import java.util.IdentityHashMap;
- import java.util.Iterator;
- import java.util.List;
- import java.util.Map;
- import java.util.Set;
- import java.util.regex.Pattern;
-
- import javax.servlet.Filter;
- import javax.servlet.FilterChain;
- import javax.servlet.FilterConfig;
- import javax.servlet.ServletContext;
- 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.http.server.HttpServerText;
-
- /**
- * Generic container filter to manage routing to different pipelines.
- * <p>
- * Callers can create and configure a new processing pipeline by using one of
- * the {@link #serve(String)} or {@link #serveRegex(String)} methods to allocate
- * a binder for a particular URL pattern.
- * <p>
- * Registered filters and servlets are initialized lazily, usually during the
- * first request. Once initialized the bindings in this servlet cannot be
- * modified without destroying the servlet and thereby destroying all registered
- * filters and servlets.
- */
- public class MetaFilter implements Filter {
- static final String REGEX_GROUPS = "org.eclipse.jgit.http.server.glue.MetaServlet.serveRegex";
-
- private ServletContext servletContext;
-
- private final List<ServletBinderImpl> bindings;
-
- private volatile UrlPipeline[] pipelines;
-
- /**
- * Empty filter with no bindings.
- */
- public MetaFilter() {
- this.bindings = new ArrayList<>();
- }
-
- /**
- * Construct a binding for a specific path.
- *
- * @param path
- * pattern to match.
- * @return binder for the passed path.
- */
- public ServletBinder serve(String path) {
- if (path.startsWith("*"))
- return register(new SuffixPipeline.Binder(path.substring(1)));
- throw new IllegalArgumentException(MessageFormat.format(HttpServerText
- .get().pathNotSupported, path));
- }
-
- /**
- * Construct a binding for a regular expression.
- *
- * @param expression
- * the regular expression to pattern match the URL against.
- * @return binder for the passed expression.
- */
- public ServletBinder serveRegex(String expression) {
- return register(new RegexPipeline.Binder(expression));
- }
-
- /**
- * Construct a binding for a regular expression.
- *
- * @param pattern
- * the regular expression to pattern match the URL against.
- * @return binder for the passed expression.
- */
- public ServletBinder serveRegex(Pattern pattern) {
- return register(new RegexPipeline.Binder(pattern));
- }
-
- /** {@inheritDoc} */
- @Override
- public void init(FilterConfig filterConfig) throws ServletException {
- servletContext = filterConfig.getServletContext();
- }
-
- /** {@inheritDoc} */
- @Override
- public void destroy() {
- if (pipelines != null) {
- Set<Object> destroyed = newIdentitySet();
- for (UrlPipeline p : pipelines)
- p.destroy(destroyed);
- pipelines = null;
- }
- }
-
- private static Set<Object> newIdentitySet() {
- final Map<Object, Object> m = new IdentityHashMap<>();
- return new AbstractSet<Object>() {
- @Override
- public boolean add(Object o) {
- return m.put(o, o) == null;
- }
-
- @Override
- public boolean contains(Object o) {
- return m.keySet().contains(o);
- }
-
- @Override
- public Iterator<Object> iterator() {
- return m.keySet().iterator();
- }
-
- @Override
- public int size() {
- return m.size();
- }
- };
- }
-
- /** {@inheritDoc} */
- @Override
- public void doFilter(ServletRequest request, ServletResponse response,
- FilterChain chain) throws IOException, ServletException {
- HttpServletRequest req = (HttpServletRequest) request;
- HttpServletResponse res = (HttpServletResponse) response;
- UrlPipeline p = find(req);
- if (p != null)
- p.service(req, res);
- else
- chain.doFilter(req, res);
- }
-
- private UrlPipeline find(HttpServletRequest req) throws ServletException {
- for (UrlPipeline p : getPipelines())
- if (p.match(req))
- return p;
- return null;
- }
-
- private ServletBinder register(ServletBinderImpl b) {
- synchronized (bindings) {
- if (pipelines != null)
- throw new IllegalStateException(
- HttpServerText.get().servletAlreadyInitialized);
- bindings.add(b);
- }
- return register((ServletBinder) b);
- }
-
- /**
- * Configure a newly created binder.
- *
- * @param b
- * the newly created binder.
- * @return binder for the caller, potentially after adding one or more
- * filters into the pipeline.
- */
- protected ServletBinder register(ServletBinder b) {
- return b;
- }
-
- private UrlPipeline[] getPipelines() throws ServletException {
- UrlPipeline[] r = pipelines;
- if (r == null) {
- synchronized (bindings) {
- r = pipelines;
- if (r == null) {
- r = createPipelines();
- pipelines = r;
- }
- }
- }
- return r;
- }
-
- private UrlPipeline[] createPipelines() throws ServletException {
- UrlPipeline[] array = new UrlPipeline[bindings.size()];
-
- for (int i = 0; i < bindings.size(); i++)
- array[i] = bindings.get(i).create();
-
- Set<Object> inited = newIdentitySet();
- for (UrlPipeline p : array)
- p.init(servletContext, inited);
- return array;
- }
- }
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