content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package org.apache.chemistry.opencmis.server.shared;
  
  import java.util.Map;
  
  import javax.servlet.http.HttpServletRequest;
  
  import org.apache.chemistry.opencmis.commons.exceptions.CmisInvalidArgumentException;
  import org.apache.chemistry.opencmis.commons.impl.IOUtils;
  
  public final class HttpUtils {
  
      private HttpUtils() {
      }
  
      /**
       * Extracts a string parameter.
       */
      public static String getStringParameter(final HttpServletRequest request, final String name) {
          assert request != null;
  
          if (name == null) {
              return null;
          }
  
          Map<String, String[]> parameters = request.getParameterMap();
  
          if (parameters != null) {
              for (Map.Entry<String, String[]> parameter : parameters.entrySet()) {
                  if (name.equalsIgnoreCase(parameter.getKey())) {
                      if (parameter.getValue() == null) {
                          return null;
                      }
                      return parameter.getValue()[0];
                  }
              }
          }
  
          return null;
      }
  
      /**
       * Splits the path into its fragments.
       */
      public static String[] splitPath(final HttpServletRequest request) {
          assert request != null;
  
          int prefixLength = request.getContextPath().length() + request.getServletPath().length();
          String p = request.getRequestURI().substring(prefixLength);
  
          if (p.length() == 0) {
              return new String[0];
          }
  
          String[] result = p.substring(1).split("/");
          for (int i = 0; i < result.length; i++) {
              result[i] = IOUtils.decodeURL(result[i]);
  
              // check for malicious characters
              for (int j = 0; j < result[i].length(); j++) {
                  char c = result[i].charAt(j);
                  if (c == '\n' || c == '\r' || c == '\b' || c == 0) {
                      throw new CmisInvalidArgumentException("Invalid path!");
                  }
              }
          }
  
          return result;
      }
  }
  