doomi-helper/utilities/uploaderUtility.js

Doomisoft NodeJs Common Utilities

var multer = require('multer');
var path   = require('path');
var fs     = require('fs');
var fileUtilily = require('./filesystem/file')
/**
 * 设置上传保存的路径以及输出的文件名
 */
var storage = multer.diskStorage({
    //设置上传后文件路径，uploads文件夹会自动创建。
    destination: function (req, file, cb) {
        ///获取上传的文件的类型，以便将文件保存到指定的目录
        let filetype = req.query.filetype;
        ////不允许没有配置的文件
        if (!filetype) {
            req.fileerror = {successed:false,errmsg:"missing filetype for upload"};
            return cb("missing filetype for upload",null);
        }
        let configfilename = process.env.CONFIGFILE || 'configuration.json';
        let configfile = path.join(process.cwd(), configfilename);
        let config = {};
        if (fs.existsSync(configfile))    config = require(configfile).upload;
        let saveOption = config.mapping[filetype];
        if (!saveOption) {
            req.fileerror = {successed:false,errmsg:"filetype not configurated in upload setting"};
            return cb("filetype not configurated in upload setting",null);
        }
        req.fileconfig = saveOption;
        /**
         * 将url中的参数拼装成对象，以匹配文件存储的设置
         */
        let fileparam =Object.assign({},req.user,req.query);
        let destinationFolder = fileUtilily.getSaveFoler(saveOption,fileparam);
        ///文件上传后的短路径，相对路径，
        req.shortpath = destinationFolder;
        ////如果目录不存在，则创建目录
        destinationFolder = path.join(config.dest,destinationFolder);
        if (!fs.existsSync(destinationFolder)) fileUtilily.mkdirsSync(path.resolve(destinationFolder))
        cb(null, destinationFolder)
    },
    //给上传文件重命名，获取添加后缀名
    filename: function (req, file, cb) {
        let saveOption =req.fileconfig; //this.config.mapping[filetype];
        if (!saveOption) {
            req.fileerror = {successed:false,errmsg:"filetype not configurated in upload setting"};
            cb("filetype not configurated in upload setting",null);
        }
        let finalFile = fileUtilily.getSaveOnlyFileName(saveOption,file.originalname);
        req.shortpath = path.join(req.shortpath,finalFile);
        cb(null,finalFile);
        //cb(null, file.fieldname + '-' + Date.now() + "." + fileFormat[fileFormat.length - 1]);
    }
});
//添加配置文件到muler对象。
var upload = multer({storage: storage});

exports = module.exports = upload;