问题
I currently have a backend where i can upload multiple images using multer. these images are passed through sharp to resize the images to create a full and thumbnail image. An entry of the post is stored in my posts table in my database and the fileName of the images is also stored in Post_Images table in my database.
My problem is that i am currently using multer diskStorage to store my images on my disk and now i want to store the images on AWS S3.
I was trying to implement this but it did not work.
posts.js
const s3 = new AWS.S3({
accessKeyId: process.env.AWS_ID,
secretAccessKey: process.env.AWS_SECRET
Bucket:process.env.AWS_BUCKET
})
const storage = multer.diskStorage({
destination: function (req, file, callback) {
callback(null, "./uploads");
},
filename: function (req, file, callback) {
console.log(file.originalname);
callback(null, file.originalname + "-" + new Date().toISOString() + "-" + uuidv4());
},
});
const multerS3Config = multerS3({
s3: s3,
bucket: process.env.AWS_BUCKET,
metadata: function (req, file, cb) {
cb(null, { fieldName: file.fieldname });
},
key: function (req, file, cb) {
console.log(file)
// cb(null, file.originalname + "-" + new Date().toISOString() + "-" + uuidv4())//
cb(null, new Date().toISOString() + "-" + uuidv4()+ "-" + file.originalname)
}
});
const upload = multer({
storage: multerS3Config,
limits: { fieldSize: 25 * 1024 * 1024 },
});
router.post(
"/",
[
upload.array("images", config.get("maxImageCount")),
imageResize,
],
async (req, res) => {
const paths = await req.files.map((file) => ({ fileName: file.filename }));
await Post.create({
title: req.body.title,
userId: req.body.userId,
Post_Images: paths.map((x) => ({ images: x.fileName
})),
},
{
include: [Post_Image] }).then(
res.status(201).send()
ImageResize.js
const sharp = require("sharp");
const path = require("path");
const fs = require("fs");
const outputFolder = "public/assets";
module.exports = async (req, res, next) => {
const images = [];
const resizePromises = req.files.map(async (file) => {
await sharp(file.path)
.resize(2000)
.jpeg({ quality: 50 })
.toFile(path.resolve(outputFolder, file.filename + "_full.jpg"));
await sharp(file.path)
.resize(100)
.jpeg({ quality: 30 })
.toFile(path.resolve(outputFolder, file.filename + "_thumb.jpg"));
fs.unlinkSync(file.path);
images.push(file.filename);
});
await Promise.all([...resizePromises]);
req.images = images;
next();
};
Everytime I try to upload a post, I keep getting
UnhandledPromiseRejectionWarning: Error: Invalid input
I think I am getting this error because I am no longer using my disk storage and therefore I don't have access to file.path and file.filename.
When i do when i do console.log(file) in my ImageREsize.js middleware, i get this
{ fieldname: 'images', originalname: 'FILENAME', encoding: '7bit',
mimetype: 'image/jpeg', size: 38184, bucket: 'BUCKET NAME', key:
'IMAGE NAME', acl: 'private', contentType: 'application/octet-
stream', contentDisposition: null, storageClass: 'STANDARD',
serverSideEncryption: null, metadata: { fieldName: 'images' },
location: 'IMAGE LINK', etag: '""', versionId: undefined }
UPDATE
Initially i was trying to use multerS3 to accomplish this, but after looking at several answers i decide to give this a try. To use plain multer to handle the incoming file, resize it with sharp and upload each resized file to S3 using AWS-SDK.
The entry of the image is getting stored in my postgres database but then i get an
Error: Input file is missing
and when i check my bucket it is empty.
Here is my code
posts.js
const s3 = new AWS.S3({
accessKeyId: process.env.AWS_ID,
secretAccessKey: process.env.AWS_SECRET,
Bucket:process.env.AWS_BUCKET,
region:process.env.AWS_REGION
})
const storage=multer.memoryStorage({})
const upload = multer({
storage: storage,
limits: { fieldSize: 25 * 1024 * 1024 },
});
router.post(
"/",
[ upload.array("images", config.get("maxImageCount")),
imageResize,
],
async (req, res) => {
const paths = await req.files.map((file) => ({ originalName:
file.originalname + "-" + new Date().toISOString() + "-" + uuidv4()
}));
await Post.create({
title: req.body.title,
userId: req.body.userId,
Post_Images: paths.map((x) => ({ images: x.originalName
})),
},
{
include: [Post_Image] }).then(
res.status(201).send()
imageResize.js
const sharp = require("sharp");
const path = require("path");
const fs = require("fs");
const outputFolder = "public/assets";
require("dotenv").config();
const AWS = require('aws-sdk')
const s3 = new AWS.S3({
accessKeyId: process.env.AWS_ID,
secretAccessKey: process.env.AWS_SECRET,
Bucket:process.env.AWS_BUCKET,
region:process.env.AWS_REGION
})
module.exports = async (req, res, next) => {
const images = [];
const resizePromises = req.files.map(async (file) => {
console.log(file)
await sharp(file)
.resize(2000)
.jpeg({ quality: 50 })
.toBuffer()
.then(resized=>s3.upload({
Bucket:process.env.AWS_BUCKET,
key:file.originalname + "-" + new Date().toISOString() + "-" + uuidv4() + "_full.jpg",
Body:resized
}));
await sharp(file)
.resize(100)
.jpeg({ quality: 30 })
.toBuffer()
.then(resized=>s3.upload({
Bucket:process.env.AWS_BUCKET,
key:file.originalname + "-" + new Date().toISOString() + "-" + uuidv4() + "_thumb.jpg",
Body:resized
}));
fs.unlinkSync(file.buffer);
images.push(file.originalname);
});
await Promise.all([...resizePromises]);
req.images = images;
next();
};
回答1:
I managed to get it to work, my problem was my imageResize middleware. I had to implement storage to AWS S3 to the code i had instead of saving it to the disk.
posts.js
const storage=multer.memoryStorage()
const upload = multer({
storage: storage,
limits: { fieldSize: 25 * 1024 * 1024 },
});
router.post(
"/",
[ upload.array("images", config.get("maxImageCount")),
imageResize,
],
async (req, res) => {
const paths = await req.files.map((file) => ({ originalName: file.originalname}));
await Post.create({
title: req.body.title,
userId: req.body.userId,
Post_Images: paths.map((x) => ({ images: x.originalName })),
},
{
include: [Post_Image] }).then(
res.status(201).send())
imageResize.js
const sharp = require("sharp");
require("dotenv").config();
const AWS = require('aws-sdk')
const s3 = new AWS.S3({
accessKeyId: process.env.AWS_ID,
secretAccessKey: process.env.AWS_SECRET,
region:process.env.AWS_REGION
})
module.exports = async (req, res, next) => {
const images = [];
const resizePromises = req.files.map(async (file) => {
console.log(file)
await sharp(file.buffer)
.resize(2000)
.jpeg({ quality: 50 })
.toBuffer()
.then(resized=>s3.upload({
Bucket:process.env.AWS_BUCKET,
Key:file.originalname + "_full.jpg",
Body:file.buffer,
ACL: 'public-read'
}).promise()),
await sharp(file.buffer)
.resize(100)
.jpeg({ quality: 30 })
.toBuffer()
.then(resized=>s3.upload({
Bucket:process.env.AWS_BUCKET,
Key:file.originalname + "_thumb.jpg",
Body:file.buffer,
ACL: 'public-read'
}).promise())
images.push(file.originalname);
});
await Promise.all([...resizePromises]);
req.images = images;
next();
};
来源：https://stackoverflow.com/questions/65465145/uploading-multiple-images-with-multer-to-aws-s3