content: package com.ruoyi.web.controller.common;
  
  import cn.hutool.core.io.FileUtil;
  import com.ruoyi.common.config.RuoYiConfig;
  import com.ruoyi.common.constant.Constants;
  import com.ruoyi.common.constant.FileSuffix;
  import com.ruoyi.common.core.domain.AjaxResult;
  import com.ruoyi.common.exception.file.FileNameLengthLimitExceededException;
  import com.ruoyi.common.utils.StringUtils;
  import com.ruoyi.common.utils.file.FileUploadUtils;
  import com.ruoyi.common.utils.file.FileUtils;
  import com.ruoyi.common.utils.file.MimeTypeUtils;
  import com.ruoyi.framework.config.ServerConfig;
  import org.apache.commons.fileupload.FileItem;
  import org.apache.commons.fileupload.disk.DiskFileItemFactory;
  import org.apache.commons.io.IOUtils;
  import org.apache.pdfbox.pdmodel.PDDocument;
  import org.apache.pdfbox.pdmodel.PDPage;
  import org.jodconverter.DocumentConverter;
  import org.jodconverter.document.DefaultDocumentFormatRegistry;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.http.MediaType;
  import org.springframework.web.bind.annotation.GetMapping;
  import org.springframework.web.bind.annotation.PostMapping;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.bind.annotation.RestController;
  import org.springframework.web.multipart.MultipartFile;
  import org.springframework.web.multipart.commons.CommonsMultipartFile;
  
  import javax.annotation.Resource;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import java.io.*;
  import java.nio.file.Paths;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Objects;
  import java.util.UUID;
  
  /**
   * 通用请求处理
   *
   * @author ruoyi
   */
  @RestController
  @RequestMapping("/common")
  public class CommonController {
      private static final Logger log = LoggerFactory.getLogger(CommonController.class);
  
      @Autowired
      private ServerConfig serverConfig;
  
      private static final String FILE_DELIMETER = ",";
  
      @Resource
      private DocumentConverter documentConverter;
  
      /**
       * 通用下载请求
       *
       * @param fileName 文件名称
       * @param delete   是否删除
       */
      @PostMapping("/download")
      public void fileDownload(String fileName, Boolean delete, HttpServletResponse response, HttpServletRequest request) {
          try {
              if (!FileUtils.checkAllowDownload(fileName)) {
                  throw new Exception(StringUtils.format("文件名称({})非法，不允许下载。 ", fileName));
              }
              String realFileName = System.currentTimeMillis() + fileName.substring(fileName.indexOf("_") + 1);
              String filePath = RuoYiConfig.getDownloadPath() + fileName;
  
              response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
              FileUtils.setAttachmentResponseHeader(response, realFileName);
              FileUtils.writeBytes(filePath, response.getOutputStream());
              if (delete) {
                  FileUtils.deleteFile(filePath);
              }
          } catch (Exception e) {
              log.error("下载文件失败", e);
          }
      }
  
      /**
       * 通用上传请求（单个）
       */
      @PostMapping("/upload")
      public AjaxResult uploadFile(MultipartFile file) throws Exception {
          try {
              // 上传文件路径
              String filePath = RuoYiConfig.getUploadPath();
              // 上传并返回新文件名称
              String fileName = FileUploadUtils.upload(filePath, file);
              String url = serverConfig.getUrl() + fileName;
              AjaxResult ajax = AjaxResult.success();
              ajax.put("url", url);
              ajax.put("fileName", fileName);
              ajax.put("newFileName", FileUtils.getName(fileName));
              ajax.put("originalFilename", file.getOriginalFilename());
              return ajax;
          } catch (Exception e) {
              return AjaxResult.error(e.getMessage());
          }
      }
  
      /**
       * 通用上传请求（多个）
       */
      @PostMapping("/uploads")
      public AjaxResult uploadFiles(List<MultipartFile> files) throws Exception {
          try {
              // 上传文件路径
              String filePath = RuoYiConfig.getUploadPath();
              List<String> urls = new ArrayList<String>();
              List<String> fileNames = new ArrayList<String>();
              List<String> newFileNames = new ArrayList<String>();
              List<String> originalFilenames = new ArrayList<String>();
              for (MultipartFile file : files) {
                  // 上传并返回新文件名称
                  String fileName = FileUploadUtils.upload(filePath, file);
                  String url = serverConfig.getUrl() + fileName;
                  urls.add(url);
                  fileNames.add(fileName);
                  newFileNames.add(FileUtils.getName(fileName));
                  originalFilenames.add(file.getOriginalFilename());
              }
              AjaxResult ajax = AjaxResult.success();
              ajax.put("urls", StringUtils.join(urls, FILE_DELIMETER));
              ajax.put("fileNames", StringUtils.join(fileNames, FILE_DELIMETER));
              ajax.put("newFileNames", StringUtils.join(newFileNames, FILE_DELIMETER));
              ajax.put("originalFilenames", StringUtils.join(originalFilenames, FILE_DELIMETER));
              return ajax;
          } catch (Exception e) {
              return AjaxResult.error(e.getMessage());
          }
      }
  
      /**
       * 本地资源通用下载
       */
      @PostMapping("/download/resource")
      public void resourceDownload(String resource, HttpServletRequest request, HttpServletResponse response) throws Exception {
          try {
              if (!FileUtils.checkAllowDownload(resource)) {
                  throw new Exception(StringUtils.format("资源文件({})非法，不允许下载。 ", resource));
              }
              // 本地资源路径
              String localPath = RuoYiConfig.getProfile();
              // 数据库资源地址
              String downloadPath = localPath + StringUtils.substringAfter(resource, Constants.RESOURCE_PREFIX);
              // 下载名称
              String downloadName = StringUtils.substringAfterLast(downloadPath, "/");
              response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
              FileUtils.setAttachmentResponseHeader(response, downloadName);
              FileUtils.writeBytes(downloadPath, response.getOutputStream());
          } catch (Exception e) {
              log.error("下载文件失败", e);
          }
      }
  
  
      /**
       * 签章文件上传
       */
      @PostMapping("/pdf/upload")
      public AjaxResult uploadPdfFile(MultipartFile file) throws Exception {
          try {
              // 获取文件名长度
              int fileNameLength = Objects.requireNonNull(file.getOriginalFilename()).length();
              // 如果文件名长度超过默认长度，抛出异常
              if (fileNameLength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
                  throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
              }
              // 上传文件路径
              String filePath = RuoYiConfig.getUploadPath();
  
              // 检查文件类型是否允许上传
              FileUploadUtils.assertAllowed(file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
              // 获取文件后缀名
              String fileSuffix = Objects.requireNonNull(file.getOriginalFilename()).substring(file.getOriginalFilename().lastIndexOf(".") + 1);
              // 提取文件名
              String fileName = FileUploadUtils.extractFilename(file);
  
              // 获取文件绝对路径
              String absPath = FileUploadUtils.getAbsoluteFile(filePath, fileName).getAbsolutePath();
              // 将文件保存到指定路径
              file.transferTo(Paths.get(absPath));
  
              // 判断是否是图片文件  转为PDF格式
              if (!FileSuffix.PDF.equals(fileSuffix)) {
                  String path = absPath.substring(0, absPath.lastIndexOf(".") + 1) + "pdf";
                  File rename = FileUtil.rename(new File(absPath), UUID.randomUUID() + "." + fileSuffix, true);
                  documentConverter.convert(rename).to(new File(path)).as(DefaultDocumentFormatRegistry.PDF).execute();
                  String newFileName = FileUploadUtils.extractFilename(fileToMultipartFile(new File(path)));
                  rename.delete();
                  return getPdfData(path, getPathFileName(filePath, newFileName), new File(path).getName(), serverConfig.getUrl() + getPathFileName(filePath, fileName));
              }
              return getPdfData(absPath, getPathFileName(filePath, fileName), file.getOriginalFilename(), serverConfig.getUrl() + getPathFileName(filePath, fileName));
          } catch (Exception e) {
              return AjaxResult.error(e.getMessage());
          }
      }
  
      public MultipartFile fileToMultipartFile(File file) {
          FileItem item = new DiskFileItemFactory().createItem("file", MediaType.MULTIPART_FORM_DATA_VALUE, true, file.getName());
          try (InputStream input = new FileInputStream(file); OutputStream os = item.getOutputStream()) {
              // 流转移
              IOUtils.copy(input, os);
          } catch (Exception e) {
              throw new IllegalArgumentException("Invalid file: " + e, e);
          }
          return new CommonsMultipartFile(item);
      }
  
      public AjaxResult getPdfData(String filePath, String fileName, String originalFilename, String url) {
          AjaxResult ajax = AjaxResult.success();
          File file = new File(filePath);
  
          try (PDDocument document = PDDocument.load(file)) {
              int pageCount = document.getNumberOfPages();
  
              ajax.put("pages", pageCount);
              ajax.put("url", url);
              ajax.put("fileName", fileName);
              ajax.put("newFileName", FileUtils.getName(fileName));
              ajax.put("originalFilename", originalFilename);
  
              List<Float> widthList = new ArrayList<>();
              List<Float> heightList = new ArrayList<>();
  
  
              for (int i = 0; i < pageCount; i++) {
                  PDPage page = document.getPage(i);
                  float width = page.getMediaBox().getWidth();
                  float height = page.getMediaBox().getHeight();
                  widthList.add(width);
                  heightList.add(height);
              }
  
              ajax.put("width", widthList);
              ajax.put("height", heightList);
          } catch (IOException e) {
              e.printStackTrace();
          }
  
          return ajax;
      }
  
      public static String getPathFileName(String uploadDir, String fileName) throws IOException {
          int dirLastIndex = RuoYiConfig.getProfile().length() + 1;
          String currentDir = StringUtils.substring(uploadDir, dirLastIndex);
          return Constants.RESOURCE_PREFIX + "/" + currentDir + "/" + fileName;
      }
  }
  