jgit/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/glue/SuffixPipeline.java

/*
 * Copyright (C) 2009-2010, Google Inc.
 * and other copyright owners as documented in the project's IP log.
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 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Distribution License v1.0 which
 * accompanies this distribution, is reproduced below, and is
 * available at http://www.eclipse.org/org/documents/edl-v10.php
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package org.eclipse.jgit.http.server.glue;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.eclipse.jgit.http.server.ServletUtils;

/**
 * Selects requests by matching the suffix of the URI.
 * <p>
 * The suffix string is literally matched against the path info of the servlet
 * request, as this class assumes it is invoked by {@link MetaServlet}. Suffix
 * strings may include path components. Examples include {@code /info/refs}, or
 * just simple extension matches like {@code .txt}.
 * <p>
 * When dispatching to the rest of the pipeline the HttpServletRequest is
 * modified so that {@code getPathInfo()} does not contain the suffix that
 * caused this pipeline to be selected.
 */
class SuffixPipeline extends UrlPipeline {
	static class Binder extends ServletBinderImpl {
		private final String suffix;

		Binder(final String suffix) {
			this.suffix = suffix;
		}

		UrlPipeline create() {
			return new SuffixPipeline(suffix, getFilters(), getServlet());
		}
	}

	private final String suffix;

	private final int suffixLen;

	SuffixPipeline(final String suffix, final Filter[] filters,
			final HttpServlet servlet) {
		super(filters, servlet);
		this.suffix = suffix;
		this.suffixLen = suffix.length();
	}

	boolean match(final HttpServletRequest req) {
		final String pathInfo = ServletUtils.getEncodedPathInfo(req);
		return pathInfo != null && pathInfo.endsWith(suffix);
	}

	@Override
	void service(HttpServletRequest req, HttpServletResponse rsp)
			throws ServletException, IOException {
		String curInfo = ServletUtils.getEncodedPathInfo(req);
		String newPath = req.getServletPath() + curInfo;
		String newInfo = curInfo.substring(0, curInfo.length() - suffixLen);
		super.service(new WrappedRequest(req, newPath, newInfo), rsp);
	}

	@Override
	public String toString() {
		return "Pipeline[ *" + suffix + " ]";
	}
}