content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * Licensed 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.alibaba.nacos.config.server.utils;
  
  import com.alibaba.nacos.config.server.constant.Constants;
  
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  /**
   * 分析url的工具类
   *
   * @author leiwen.zh
   */
  public class UrlAnalysisUtils {
  
      private static Pattern urlPattern = Pattern.compile("^(\\w+://)?([\\w\\.]+:)(\\d*)?(\\??.*)");
  
      public static String getContentIdentity(String content) {
  
          if (!verifyIncrementPubContent(content)) {
              return null;
          }
  
          Matcher matcher = urlPattern.matcher(content);
          StringBuilder buf = new StringBuilder();
          if (matcher.find()) {
              String scheme = matcher.group(1);
              String address = matcher.group(2);
              String port = matcher.group(3);
              if (scheme != null) {
                  buf.append(scheme);
              }
              buf.append(address);
              if (port != null) {
                  buf.append(port);
              }
          }
          return buf.toString();
      }
  
      private static boolean verifyIncrementPubContent(String content) {
  
          if (content == null || content.length() == 0) {
              return false;
          }
          for (int i = 0; i < content.length(); i++) {
              char c = content.charAt(i);
              if (c == '\r' || c == '\n') {
                  return false;
              }
              if (c == Constants.WORD_SEPARATOR.charAt(0)) {
                  return false;
              }
          }
          return true;
      }
  }
  