org.chimi.s4s.controller.FileUploadController.java Source code

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Here is the source code for org.chimi.s4s.controller.FileUploadController.java

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/*
 * Copyright 2002-2011 the original author or authors.
 *
 * 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 org.chimi.s4s.controller;

import java.io.File;
import java.io.IOException;
import java.util.Random;

import javax.servlet.http.HttpServletRequest;

import org.chimi.s4s.fileservice.FileService;
import org.chimi.s4s.fileservice.UploadFile;
import org.chimi.s4s.fileservice.UploadResult;
import org.chimi.s4s.util.Util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

/**
 * ?  API  ?  
 * 
 * @author Choi Beom Kyun
 */
@Controller
public class FileUploadController {

    private final Logger logger = LoggerFactory.getLogger(getClass());

    private FileService fileService;

    @RequestMapping(value = "/upload/{serviceId}", method = RequestMethod.GET)
    public String uploadForm(@PathVariable("serviceId") String serviceId, ModelMap model) {
        model.addAttribute("serviceId", serviceId);
        return "upload";
    }

    @RequestMapping(value = "/upload/{serviceId}/json", method = RequestMethod.POST)
    public String uploadJson(@RequestParam(value = "file", required = false) MultipartFile userUploadFile,
            @PathVariable("serviceId") String serviceId, HttpServletRequest request, ModelMap model) {
        String viewName = upload(userUploadFile, serviceId, request, model);
        return viewName + ".json";
    }

    @RequestMapping(value = "/upload/{serviceId}", method = RequestMethod.POST)
    public String upload(@RequestParam(value = "file", required = false) MultipartFile userUploadFile,
            @PathVariable("serviceId") String serviceId, HttpServletRequest request, ModelMap model) {
        String resultViewName = "uploadResult";
        if (userUploadFile == null || userUploadFile.isEmpty()) {
            model.put(resultViewName, UploadResultResponse.createNoFileResult());
            return resultViewName;
        }
        //  ? ?
        File tempFile = null;
        try {
            tempFile = getTemporaryFile(userUploadFile);
        } catch (Exception ex) {
            logger.error("fail to get temp file for " + userUploadFile.getOriginalFilename(), ex);
            model.put(resultViewName, UploadResultResponse.createErrorResult());
            return resultViewName;
        }
        //  ??   ? 
        try {
            String fileName = extractFileName(userUploadFile.getOriginalFilename());
            String mimeType = getMimeType(fileName);

            UploadResult uploadResult = saveTemporaryFileToFileService(userUploadFile, serviceId, fileName,
                    mimeType, tempFile);

            String[] urls = createUrl(uploadResult, request);

            model.put(resultViewName, UploadResultResponse.createSuccessResult(uploadResult, urls[0], urls[1]));
            return resultViewName;
        } catch (Exception ex) {
            logger.error("fail to save file to storage" + userUploadFile.getOriginalFilename(), ex);
            model.put(resultViewName, UploadResultResponse.createErrorResult());
            return resultViewName;
        } finally {
            deleteTempFile(tempFile);
        }
    }

    private String[] createUrl(UploadResult uploadResult, HttpServletRequest request) {
        String url = request.getRequestURL().toString();
        int hostEndIdx = url.indexOf('/', 7);
        String host = url.substring(0, hostEndIdx);
        String contextPath = request.getContextPath();
        String[] urls = new String[2];
        urls[0] = host + contextPath + "/file/" + uploadResult.getFileId();
        if (uploadResult.isImage()) {
            urls[1] = host + contextPath + "/image/o/" + uploadResult.getFileId();
        }
        return urls;
    }

    private UploadResult saveTemporaryFileToFileService(MultipartFile userUploadFile, String serviceId,
            String fileName, String mimeType, File tempFile) {
        UploadFile uf = new UploadFile(serviceId, fileName, mimeType, tempFile, userUploadFile.getSize());
        UploadResult uploadResult = fileService.save(uf);
        return uploadResult;
    }

    private void deleteTempFile(File file) {
        if (file == null) {
            return;
        }
        boolean deleted = file.delete();
        if (!deleted) {
            if (logger.isWarnEnabled()) {
                logger.warn("Fail to delete temporary upload file {}.", file.getAbsolutePath());
            }
        }
    }

    private Random random = new Random();

    private File getTemporaryFile(MultipartFile userUploadFile) throws IllegalStateException, IOException {
        StringBuilder tempNameBuilder = new StringBuilder();
        tempNameBuilder.append(System.currentTimeMillis()).append(".").append(random.nextInt(1000));
        File tempFile = new File(Util.getS4STempDir(), tempNameBuilder.toString());
        userUploadFile.transferTo(tempFile);
        return tempFile;
    }

    private String getMimeType(String fileName) {
        return MimeUtil.getMimeType(fileName);
    }

    private String extractFileName(String originalFilename) {
        int lastPathSeparator = originalFilename.lastIndexOf('\\');
        if (lastPathSeparator == -1) {
            lastPathSeparator = originalFilename.lastIndexOf('/');
        }
        if (lastPathSeparator == -1) {
            return originalFilename;
        }
        return originalFilename.substring(lastPathSeparator + 1);
    }

    public void setFileService(FileService fileService) {
        this.fileService = fileService;
    }

}