multer-s3重命名文件多次上载相同的图像

Question

帮助!无论我做什么，我似乎不能使用multer-s3给图像一个自定义的文件名。我有一个非常酷的自定义功能，可以将图片上传到s3。如果我使用文件的原始文件名，它工作得很好，但是，当我尝试使用自定义文件名时，它会在新文件名下上传第一张图像三次。如果任何人有任何建议、见解或知道为什么这个方法不起作用。我会把它说出来的。

var AWS = require("../AWS").AWS;
var s3 = require("../AWS").s3;
var multer = require("multer");
var multerS3 = require("multer-s3");
function generateKey(file, newFileName) {
  //   var finalFileName = newFileName + "." + file.originalname.split(".")[1];
  var finalFileName = newFileName + "." + file.originalname.split(".")[1];
  return finalFileName;
}
async function singleFileUpload(req, res, newFileName, bucketName, fieldName) {
  var fileFilter = (req, file, cb) => {
    var ext = file.originalname.split(".").slice(-1);
    if (ext == "jpg" || ext == "mp4" || ext == "wmv") {
      cb(null, true);
    } else {
      cb(new Error("invalid file format"), false);
    }
  };
  var upload = multer({
    fileFilter,
    storage: multerS3({
      s3,
      bucket: bucketName,
      acl: "public-read",
      metadata: function(req, file, cb) {
        cb(null, { test: "testing_meta_data!" });
      },
      //   key: function(req, file, cb) {
      //     // let fileExtension = file.originalname.split(".")[1];
      //     let finalFileName = file.originalname;
      //     console.log(finalFileName);
      //     cb(null, finalFileName);
      //   }
      key: function(req, file, cb) {
        var newKey = generateKey(file, newFileName);
        console.log("newKey", newKey);
        cb(null, newKey);
      }
    })
  });
  console.log(fieldName);
  var singleUpload = upload.any(fieldName);

  await singleUpload(req, res, error => {
    if (error) {
      throw error;
    } else {
      console.log("it worked");
    }
  });
}

然后调用我的自定义函数，如下所示

singleFileUpload(req, res, "myNewFileName" "mybucketName", fieldName);

我多次调用它，因为我希望能够重命名每个文件。谢谢。

Answer 1

这段代码可以工作。

var upload = multer({
  storage: multerS3({
    s3,
    bucket: process.env.BUCKET_NAME,
    metadata: function(req, file, cb) {
      cb(null, { fieldName: file.fieldname });
    },
    key: function(req, file, cb) {
      cb(null, reNameFiles(file, req.body.id, req.originalUrl));
    },
    contentType: multerS3.AUTO_CONTENT_TYPE
  })
});
function reNameFiles(file, id, type) {
  let lastIndex = type.lastIndexOf("/");
  let videoType = type.slice(lastIndex + 1);
  let finalFileName = "";
  if (videoType == "templateMainVideoThumbnail") {
    finalFileName =
      "templates/" +
      id +
      "/main/original/" +
      "video" +
      "." +
      file.originalname.split(".").slice(-1);
    return finalFileName;
  }
  for (let i = 1; i <= 4; i++) {
    if (videoType === "templateExampleVideo" + i) {
      finalFileName =
        "templates/" +
        id +
        "/example" +
        i.toString() +
        "/original/example" +
        i.toString() +
        "." +
        file.originalname.split(".").slice(-1);
      return finalFileName;
    }
  }
  for (let j = 1; j <= 4; j++) {
    if (videoType === "templateExamplePoster" + j) {
      finalFileName =
        "templates/" +
        id +
        "/example" +
        j.toString() +
        "/poster." +
        file.originalname.split(".").slice(-1);
      return finalFileName;
    }
  }
  if (videoType === "templatePosterImage") {
    finalFileName =
      "templates/" +
      id +
      "/poster/poster" +
      "." +
      file.originalname.split(".").slice(-1);
    return finalFileName;
  }
  if (videoType == "templateThumbnailFiles") {
    let cleanOrginalName = file.originalname.replace(/\s/g, "");
    finalFileName =
      "templates/" + id + "/thumbnails/" + Date.now() + cleanOrginalName;
    return finalFileName;
  }
  if (videoType == "stockMainVideoThumbnail") {
    finalFileName =
      "stock/" +
      id +
      "/main/original/" +
      "video" +
      "." +
      file.originalname.split(".").slice(-1);
    return finalFileName;
  }
  if (videoType == "stockPosterImage") {
    finalFileName =
      "stock/" +
      id +
      "/poster/poster" +
      "." +
      file.originalname.split(".").slice(-1);
    return finalFileName;
  }
  if (videoType == "stockDownloadableFiles") {
    finalFileName = "stock/" + id + "/downloadable/" + file.originalname;
    return finalFileName;
  }
}

Answer 2

我正在使用这种方法通过s3-multer重命名和上传我的文件，您可以使用相同的方法：

key: function (req, file, cb) {
  file.originalname = Math.random().toString(36).substring(2, 15) + Math.random().toString(36).substring(2, 15)+path.extname(file.originalname);
  var fullPath = 'public/signature/'+ file.originalname;
  cb(null, fullPath)
}