content: /**
   * Copyright (C) 2024 AIDC-AI
   *
   * 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.langengine.core.util;
  
  import java.io.ByteArrayOutputStream;
  import java.io.InputStream;
  import java.net.URL;
  import java.util.Base64;
  
  /**
   * 图片辅助类
   *
   * @author xiaoxuan.lp
   */
  public class ImageUtils {
  
      /**
       * 把image转换为base64
       *
       * @param imageUrl
       * @return
       * @throws Exception
       */
      public static String convertImageToBase64(String imageUrl) {
          URL url = null;
          try {
              url = new URL(imageUrl);
          } catch (Throwable e) {
              throw new RuntimeException(e);
          }
          ByteArrayOutputStream baos = new ByteArrayOutputStream();
          try (InputStream is = url.openStream()) {
              // 读取图片数据
              byte[] byteChunk = new byte[4096]; // 一次最多读取4KB
              int n;
              while ((n = is.read(byteChunk)) > 0) {
                  baos.write(byteChunk, 0, n);
              }
          } catch (Throwable e) {
              throw new RuntimeException(e);
          }
          return Base64.getEncoder().encodeToString(baos.toByteArray());
      }
  }
  