file-online-preview/server/src/main/java/cn/keking/service/impl/CadFilePreviewImpl.java

package cn.keking.service.impl;

import cn.keking.config.ConfigConstants;
import cn.keking.model.FileAttribute;
import cn.keking.model.ReturnResponse;
import cn.keking.service.FilePreview;
import cn.keking.utils.DownloadUtils;
import cn.keking.service.FileHandlerService;
import cn.keking.web.filter.BaseUrlFilter;
import org.springframework.stereotype.Service;
import org.springframework.ui.Model;
import org.springframework.util.StringUtils;

import static cn.keking.service.impl.OfficeFilePreviewImpl.getPreviewType;

/**
 * @author chenjh
 * @since 2019/11/21 14:28
 */
@Service
public class CadFilePreviewImpl implements FilePreview {

    private static final String OFFICE_PREVIEW_TYPE_IMAGE = "image";
    private static final String OFFICE_PREVIEW_TYPE_ALL_IMAGES = "allImages";
    private static final String FILE_DIR = ConfigConstants.getFileDir();

    private final FileHandlerService fileHandlerService;

    public CadFilePreviewImpl(FileHandlerService fileHandlerService) {
        this.fileHandlerService = fileHandlerService;
    }

    @Override
    public String filePreviewHandle(String url, Model model, FileAttribute fileAttribute) {
        // 预览Type，参数传了就取参数的，没传取系统默认
        String officePreviewType = model.asMap().get("officePreviewType") == null ? ConfigConstants.getOfficePreviewType() : model.asMap().get("officePreviewType").toString();
        String baseUrl = BaseUrlFilter.getBaseUrl();
        String suffix = fileAttribute.getSuffix();
        String fileName = fileAttribute.getName();
        String pdfName = fileName.substring(0, fileName.lastIndexOf(".") + 1) + "pdf";
        String outFilePath = FILE_DIR + pdfName;
        // 判断之前是否已转换过，如果转换过，直接返回，否则执行转换
        if (!fileHandlerService.listConvertedFiles().containsKey(pdfName) || !ConfigConstants.isCacheEnabled()) {
            String filePath;
            ReturnResponse<String> response = DownloadUtils.downLoad(fileAttribute, null);
            if (response.isFailure()) {
                model.addAttribute("fileType", suffix);
                model.addAttribute("msg", response.getMsg());
                return "fileNotSupported";
            }
            filePath = response.getContent();
            if (StringUtils.hasText(outFilePath)) {
                boolean convertResult = fileHandlerService.cadToPdf(filePath, outFilePath);
                if (!convertResult) {
                    model.addAttribute("fileType", suffix);
                    model.addAttribute("msg", "cad文件转换异常，请联系管理员");
                    return "fileNotSupported";
                }
                if (ConfigConstants.isCacheEnabled()) {
                    // 加入缓存
                    fileHandlerService.addConvertedFile(pdfName, fileHandlerService.getRelativePath(outFilePath));
                }
            }
        }
        if (baseUrl != null && (OFFICE_PREVIEW_TYPE_IMAGE.equals(officePreviewType) || OFFICE_PREVIEW_TYPE_ALL_IMAGES.equals(officePreviewType))) {
            return getPreviewType(model, fileAttribute, officePreviewType, baseUrl, pdfName, outFilePath, fileHandlerService, OFFICE_PREVIEW_TYPE_IMAGE);
        }
        model.addAttribute("pdfUrl", pdfName);
        return "pdf";
    }


}