# OSS相关配置信息
aliyun:
  oss:
    endpoint:  # oss对外服务的访问域名
    accessKeyId:  # 访问身份验证中用到用户标识
    accessKeySecret: # 用户用于加密签名字符串和oss用来验证签名字符串的密钥
    bucketName:  # oss的存储空间
    urlPrefix: 
    policy:
      expire: 300 # 签名有效期(S)
    maxSize: 10 # 上传文件大小(M)
    #callback: # 文件上传成功后的回调地址

@Configuration
@Data
public class AliyunConfig {
    @Value("${aliyun.oss.endpoint}")
    private String endpoint;
    @Value("${aliyun.oss.accessKeyId}")
    private String accessKeyId;
    @Value("${aliyun.oss.accessKeySecret}")
    private String accessKeySecret;
    @Value("${aliyun.oss.bucketName}")
    private String bucketName;
    @Value("${aliyun.oss.urlPrefixe}")
    private String urlPrefix;

    @Bean
    public OSS oSSClient() {
        return new OSSClient(endpoint, accessKeyId, accessKeySecret);
    }
}

@Data
public class FileUploadResult {
    // 文件唯一标识
    private String uid;
    // 文件名
    private String name;
    // 状态有：uploading done error removed
    private String status;
    // 服务端响应内容，如：‘{"status": "success"}‘
    private String response;
}

public enum FileStateEnum {
    GET_FILE_FAIL(-1, "获取文件流失败"), GET_FILE_SUCCESS(1, "成功获取文件流ccc"),
    NULL_FILE(-1, "上传文件为空"), MAX_SIZE_FILE(-1, "上传图片大小不能超过10M"),
    UPLOAD_FILE_FAIL(-1, "上传文件失败"), UPLOAD_FILE_SUCCESS(1, "上传文件成功"),
    DELETE_FILE_FAIL(-1, "删除文件失败");

    private int state;
    private String stateInfo;

    FileStateEnum(int state, String stateInfo) {
        this.state = state;
        this.stateInfo = stateInfo;
    }

    public int getState() {
        return state;
    }

    public void setState(int state) {
        this.state = state;
    }

    public String getStateInfo() {
        return stateInfo;
    }

    public void setStateInfo(String stateInfo) {
        this.stateInfo = stateInfo;
    }
}

/**
 * @author 团子
 * @desc
 * @date 2019-07-31 11:31
 */
@Controller
@RequestMapping({"${adminPath}/cover"})
public class CoverFileUploadController {
    @Autowired
    private CoverFileUploadService coverFileUploadService;

    /**
     * @return FileUploadResult
     * @author 团子
     * @desc 文件上传到oss
     * @Param uploadFile
     */
    @RequestMapping("file/upload")
    @ResponseBody
    public FileUploadResult upload(@RequestParam("file") MultipartFile uploadFile)
            throws Exception {
        return this.coverFileUploadService.upload(uploadFile);
    }

    /**
     * @return FileUploadResult
     * @desc 根据文件名删除oss上的文件
     * @author 团子
     * @Param objectName
     */
    @RequestMapping("file/delete")
    @ResponseBody
    public FileUploadResult delete(@RequestParam("fileName") String objectName)
            throws Exception {
        return this.coverFileUploadService.delete(objectName);
    }

    /**
     * @return List<OSSObjectSummary>
     * @author 团子
     * @desc 查询oss上的所有文件
     * @Param
     */
    @RequestMapping("file/list")
    @ResponseBody
    public List<OSSObjectSummary> list()
            throws Exception {
        return this.coverFileUploadService.list();
    }

    /**
     * @return
     * @author 团子
     * @desc 根据文件名下载oss上的文件
     * @Param objectName
     */
    @RequestMapping("file/download")
    @ResponseBody
    public void download(@RequestParam("fileName") String objectName, HttpServletResponse response) throws IOException {
        //通知浏览器以附件形式下载
        response.setHeader("Content-Disposition",
                "attachment;filename=" + new String(objectName.getBytes(), "ISO-8859-1"));
        this.coverFileUploadService.exportOssFile(response.getOutputStream(), objectName);
    }
}

@Service
public class CoverFileUploadService {
    // 允许上传的格式
    private static final String[] IMAGE_TYPE = new String[]{".bmp", ".jpg",
            ".jpeg", ".gif", ".png"};
    @Autowired
    private OSS ossClient;
    @Autowired
    private AliyunConfig aliyunConfig;

    /**
     * @author 团子
     * @desc 文件上传
     * @date 2019-07-31 11:31
     */
    public FileUploadResult upload(MultipartFile uploadFile) {
        // 校验图片格式
        boolean isLegal = false;
        for (String type : IMAGE_TYPE) {
            if (StringUtils.endsWithIgnoreCase(uploadFile.getOriginalFilename(),
                    type)) {
                isLegal = true;
                break;
            }
        }
        //封装Result对象，并且将文件的byte数组放置到result对象中
        FileUploadResult fileUploadResult = new FileUploadResult();
        if (!isLegal) {
            fileUploadResult.setStatus("error");
            return fileUploadResult;
        }
        //文件新路径
        String fileName = uploadFile.getOriginalFilename();
        String filePath = getFilePath(fileName);
        // 上传到阿里云
        try {
            ossClient.putObject(aliyunConfig.getBucketName(), filePath, new
                    ByteArrayInputStream(uploadFile.getBytes()));
        } catch (Exception e) {
            e.printStackTrace();
            //上传失败
            fileUploadResult.setStatus("error");
            return fileUploadResult;
        }
        fileUploadResult.setStatus("done");
        fileUploadResult.setResponse("success");
        fileUploadResult.setName(this.aliyunConfig.getUrlPrefix() + filePath);
        fileUploadResult.setUid(String.valueOf(System.currentTimeMillis()));
        return fileUploadResult;
    }

    /**
     * @author 团子
     * @desc 生成路径以及文件名 例如：//images/2019/08/10/15564277465972939.jpg
     * @date 2019-07-31 11:31
     */
    private String getFilePath(String sourceFileName) {
        LocalDate localDate = LocalDate.now();
        return "images/" + localDate.getYear()
                + "/" + localDate.getMonth() + "/"
                + localDate.getDayOfMonth() + "/" + System.currentTimeMillis() +
                RandomUtils.nextInt(100, 9999) + "." +
                StringUtils.substringAfterLast(sourceFileName, ".");
    }

    /**
     * @author 团子
     * @desc 查看文件列表
     * @date 2019-07-31 11:31
     */
    public List<OSSObjectSummary> list() {
        // 设置最大个数。
        final int maxKeys = 200;
        // 列举文件。
        ObjectListing objectListing = ossClient.listObjects(new ListObjectsRequest(aliyunConfig.getBucketName()).withMaxKeys(maxKeys));
        List<OSSObjectSummary> sums = objectListing.getObjectSummaries();
        return sums;
    }

    /**
     * @author 团子
     * @desc 删除文件
     * @date 2019-07-31 11:31
     */
    public FileUploadResult delete(String objectName) {
        // 根据BucketName,objectName删除文件
        ossClient.deleteObject(aliyunConfig.getBucketName(), objectName);
        FileUploadResult fileUploadResult = new FileUploadResult();
        fileUploadResult.setName(objectName);
        fileUploadResult.setStatus("removed");
        fileUploadResult.setResponse("success");
        return fileUploadResult;
    }

    /**
     * @author 团子
     * @desc 下载文件
     * @date 2019-07-31 11:31
     */
    public void exportOssFile(OutputStream os, String objectName) throws IOException {
        // ossObject包含文件所在的存储空间名称、文件名称、文件元信息以及一个输入流。
        OSSObject ossObject = ossClient.getObject(aliyunConfig.getBucketName(), objectName);
        // 读取文件内容。
        BufferedInputStream in = new BufferedInputStream(ossObject.getObjectContent());
        BufferedOutputStream out = new BufferedOutputStream(os);
        byte[] buffer = new byte[1024];
        int lenght = 0;
        while ((lenght = in.read(buffer)) != -1) {
            out.write(buffer, 0, lenght);
        }
        if (out != null) {
            out.flush();
            out.close();
        }
        if (in != null) {
            in.close();
        }
    }
}