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 com.aliyuncs.fc.auth;
  
  import com.google.common.net.UrlEscapers;
  
  import java.io.UnsupportedEncodingException;
  import java.net.URISyntaxException;
  import java.net.URLDecoder;
  import java.net.URLEncoder;
  
  import static com.google.common.base.Strings.isNullOrEmpty;
  
  /**
   * TODO: add javadoc
   */
  public class AcsURLEncoder {
  
      public final static String URL_ENCODING = "UTF-8";
  
      /**
       * used for encoding url path segment
       */
      public static String urlEncode(String path) throws URISyntaxException {
          if (isNullOrEmpty(path)) return path;
  
          return UrlEscapers.urlFragmentEscaper().escape(path);
      }
  
      /**
       * used for encoding queries or form data
       */
      public static String encode(String value) throws UnsupportedEncodingException {
          if (isNullOrEmpty(value)) return value;
          return URLEncoder.encode(value, URL_ENCODING);
      }
  
      public static String decode(String value) throws UnsupportedEncodingException {
          if (isNullOrEmpty(value)) return value;
          return URLDecoder.decode(value, URL_ENCODING);
      }
  
      public static String percentEncode(String value) throws UnsupportedEncodingException {
          return value != null ? URLEncoder.encode(value, URL_ENCODING).replace("+", "%20")
                  .replace("*", "%2A").replace("%7E", "~") : null;
      }
  }
  