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.aliyun.oss.common.utils;
  
  import static com.aliyun.oss.internal.OSSConstants.DEFAULT_CHARSET_NAME;
  import static com.aliyun.oss.internal.OSSUtils.OSS_RESOURCE_MANAGER;
  import static com.aliyun.oss.common.utils.CodingUtils.isNullOrEmpty;
  
  import java.io.UnsupportedEncodingException;
  import java.net.URLDecoder;
  import java.net.URLEncoder;
  import java.util.Map;
  import java.util.Map.Entry;
  
  public class HttpUtil {
  
      private static final String[] ENCODED_CHARACTERS_WITH_SLASHES = new String[]{"+", "*", "%7E", "%2F"};
      private static final String[] ENCODED_CHARACTERS_WITH_SLASHES_REPLACEMENTS = new String[]{"%20", "%2A", "~", "/"};
  
      private static final String[] ENCODED_CHARACTERS_WITHOUT_SLASHES = new String[]{"+", "*", "%7E"};
      private static final String[] ENCODED_CHARACTERS_WITHOUT_SLASHES_REPLACEMENTS = new String[]{"%20", "%2A", "~"};
  
      // Encode a URL segment with special chars replaced.
      public static String urlEncode(String value, String encoding) {
          if (value == null) {
              return "";
          }
  
          try {
              String encoded = URLEncoder.encode(value, encoding);
              return encoded.replace("+", "%20").replace("*", "%2A").replace("~", "%7E").replace("/", "%2F");
          } catch (UnsupportedEncodingException e) {
              throw new IllegalArgumentException(OSS_RESOURCE_MANAGER.getString("FailedToEncodeUri"), e);
          }
      }
  
      public static String urlDecode(String value, String encoding) {
          if (isNullOrEmpty(value)) {
              return value;
          }
  
          try {
              return URLDecoder.decode(value, encoding);
          } catch (UnsupportedEncodingException e) {
              throw new IllegalArgumentException(OSS_RESOURCE_MANAGER.getString("FailedToDecodeUrl"), e);
          }
      }
  
      public static String urlEncode(String value, boolean ignoreSlashes) {
          if (value == null) {
              return "";
          }
          try {
              String encoded = URLEncoder.encode(value, DEFAULT_CHARSET_NAME);
              if (!ignoreSlashes) {
                  return StringUtils.replaceEach(encoded, ENCODED_CHARACTERS_WITHOUT_SLASHES, ENCODED_CHARACTERS_WITHOUT_SLASHES_REPLACEMENTS);
              }
              return StringUtils.replaceEach(encoded, ENCODED_CHARACTERS_WITH_SLASHES, ENCODED_CHARACTERS_WITH_SLASHES_REPLACEMENTS);
          } catch (UnsupportedEncodingException e) {
              throw new IllegalArgumentException(OSS_RESOURCE_MANAGER.getString("FailedToEncodeUri"), e);
          }
      }
  
      // Encode request parameters to URL segment.
      public static String paramToQueryString(Map<String, String> params, String charset) {
  
          if (params == null || params.isEmpty()) {
              return null;
          }
  
          StringBuilder paramString = new StringBuilder();
          boolean first = true;
          for (Entry<String, String> p : params.entrySet()) {
              String key = p.getKey();
              String value = p.getValue();
  
              if (!first) {
                  paramString.append("&");
              }
  
              // Urlencode each request parameter
              paramString.append(urlEncode(key, charset));
              if (value != null) {
                  paramString.append("=").append(urlEncode(value, charset));
              }
  
              first = false;
          }
  
          return paramString.toString();
      }
  
      private static final String ISO_8859_1_CHARSET = "iso-8859-1";
      private static final String UTF8_CHARSET = "utf-8";
  
      // To fix the bug that the header value could not be unicode chars.
      // Because HTTP headers are encoded in iso-8859-1,
      // we need to convert the utf-8(java encoding) strings to iso-8859-1 ones.
      public static void convertHeaderCharsetFromIso88591(Map<String, String> headers) {
          convertHeaderCharset(headers, ISO_8859_1_CHARSET, UTF8_CHARSET);
      }
  
      // For response, convert from iso-8859-1 to utf-8.
      public static void convertHeaderCharsetToIso88591(Map<String, String> headers) {
          convertHeaderCharset(headers, UTF8_CHARSET, ISO_8859_1_CHARSET);
      }
  
      private static void convertHeaderCharset(Map<String, String> headers, String fromCharset, String toCharset) {
  
          for (Map.Entry<String, String> header : headers.entrySet()) {
              if (header.getValue() == null) {
                  continue;
              }
  
              try {
                  header.setValue(new String(header.getValue().getBytes(fromCharset), toCharset));
              } catch (UnsupportedEncodingException e) {
                  throw new IllegalArgumentException("Invalid charset name: " + e.getMessage(), e);
              }
          }
      }
  }
  