content: /*
   * Symphony - A modern community (forum/BBS/SNS/blog) platform written in Java.
   * Copyright (C) 2012-present, b3log.org
   *
   * This program is free software: you can redistribute it and/or modify
   * it under the terms of the GNU Affero General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU Affero General Public License for more details.
   *
   * You should have received a copy of the GNU Affero General Public License
   * along with this program.  If not, see <https://www.gnu.org/licenses/>.
   */
  package org.b3log.symphony.util;
  
  import org.apache.commons.lang3.StringUtils;
  
  /**
   * Image utilities.
   *
   * @author <a href="http://88250.b3log.org">Liang Ding</a>
   * @version 1.0.0.2, Feb 10, 2019
   * @since 3.2.0
   */
  public final class Images {
  
      /**
       * Qiniu image processing.
       *
       * @param content the specified article content
       * @return processed content
       */
      public static String qiniuImgProcessing(final String content) {
          String ret = content;
  
          if (!Symphonys.QN_ENABLED) {
              return ret;
          }
  
          final String qiniuDomain = Symphonys.UPLOAD_QINIU_DOMAIN;
          final String html = Markdowns.toHTML(content);
  
          final String[] imgSrcs = StringUtils.substringsBetween(html, "<img src=\"", "\"");
          if (null == imgSrcs) {
              return ret;
          }
  
          for (final String imgSrc : imgSrcs) {
              if (!StringUtils.startsWith(imgSrc, qiniuDomain) || StringUtils.contains(imgSrc, ".gif")
                      || StringUtils.containsIgnoreCase(imgSrc, "?imageView2")) {
                  continue;
              }
  
              ret = StringUtils.replace(ret, imgSrc, imgSrc + "?imageView2/2/w/768/format/webp/interlace/1");
          }
  
          return ret;
      }
  
      /**
       * Private constructor.
       */
      private Images() {
      }
  }
  