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T. J. Watson Libraries for Analysis
There is a newer version: 1.6.7
/*
 * Copyright (c) 2002 - 2011 IBM Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 */
package com.ibm.wala.cast.js.html;

import java.net.MalformedURLException;
import java.net.URL;

public class UrlManipulator {

  /**
   * @param urlFound the link as appear
   * @param context the URL in which the link appeared
   */
  public static URL relativeToAbsoluteUrl(String urlFound, URL context)
      throws MalformedURLException {
    urlFound = urlFound.replace("\\", "/").toLowerCase();

    URL absoluteUrl;
    if (!isAbsoluteUrl(urlFound)) {
      if (urlFound.startsWith("//")) {
        // create URL taking only the protocol from the context
        String origHostAndPath = urlFound.substring(2); // removing "//"
        String host;
        String path;
        int indexOf = origHostAndPath.indexOf('/');
        if (indexOf > 0) {
          host = origHostAndPath.substring(0, indexOf);
          path = origHostAndPath.substring(indexOf);
        } else {
          host = origHostAndPath;
          path = "";
        }
        absoluteUrl = new URL(context.getProtocol(), host, path);
      } else if (urlFound.startsWith("/")) {
        // create URL taking the protocol and the host from the context
        absoluteUrl = new URL(context.getProtocol(), context.getHost(), urlFound);
      } else {
        // "concat" URL to context
        int backDir = 0; // removing directories due to "../"
        while (urlFound.startsWith("../")) {
          urlFound = urlFound.substring(3);
          backDir++;
        }
        StringBuilder contextPath = new StringBuilder();
        String path = context.getPath().replace("\\", "/");
        boolean isContextDirectory = path.endsWith("/");
        String[] split = path.split("/");
        // we are also removing last element in case of a directory
        int rightTrimFromPath = (isContextDirectory ? 0 : 1) + backDir;

        for (int i = 0; i < split.length - rightTrimFromPath; i++) {
          contextPath.append(split[i]);
          contextPath.append('/');
        }
        absoluteUrl = new URL(context.getProtocol(), context.getHost(), contextPath + urlFound);
      }
    } else {
      absoluteUrl = new URL(urlFound);
    }
    return absoluteUrl;
  }

  private static boolean isAbsoluteUrl(String orig) {
    return orig.startsWith("http");
  }
}