/*
    * 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 javax.servlet.Filter;
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  /**
   * 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(String suffix) {
  			this.suffix = suffix;
  		}
  
  		@Override
  		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();
  	}
  
  	@Override
  	boolean match(HttpServletRequest req) {
  		final String pathInfo = req.getPathInfo();
  		return pathInfo != null && pathInfo.endsWith(suffix);
  	}
  
  	@Override
  	void service(HttpServletRequest req, HttpServletResponse rsp)
  			throws ServletException, IOException {
  		String curInfo = req.getPathInfo();
  		String newPath = req.getServletPath() + curInfo;
  		String newInfo = curInfo.substring(0, curInfo.length() - suffixLen);
  		super.service(new WrappedRequest(req, newPath, newInfo), rsp);
  	}
  
  	/** {@inheritDoc} */
  	@Override
  	public String toString() {
  		return "Pipeline[ *" + suffix + " ]";
  	}
  }