@tshio/multer-google-storage
v2.0.0
Published
Streaming multer storage engine for Google Cloud Storage
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multer-google-storage
This is a multer storage engine for google's file storage.
Installation
npm install @tshio/multer-google-storage --save
or
yarn add @tshio/multer-google-storage
Usage
ES6
import * as multer from 'multer';
import * as express from 'express';
import MulterGoogleCloudStorage from '@tshio/multer-google-storage';
const app = express();
const uploadHandler = multer({
storage: new MulterGoogleCloudStorage()
});
app.post('/upload', uploadHandler.any(), (req, res) => {
console.log(req.files);
res.json(req.files);
});
ES5 / Common.js imports
var multer = require("multer");
var express = require("express");
var multerGoogleStorage = require("@tshio/multer-google-storage");
var app = express();
var uploadHandler = multer({
storage: multerGoogleStorage.storageEngine()
});
app.post('/upload', uploadHandler.any(), function (req, res) {
console.log(req.files);
res.json(req.files);
});
NB: This package is written to work with es5 or higher. If you have an editor or IDE that can understand d.ts (typescript) type definitions you will get additional support from your tooling though you do not need to be using typescript to use this package.
Google Cloud
Creating a storage bucket
For instructions on how to create a storage bucket see the following documentation from google.
Obtaining credentials
For instructions on how to obtain the JSON keyfile as well a "projectId" (contained in the key file) please refer to the following documentation from google
Credentials
Default method
If using the MulterGoogleCloudStorage class without passing in any configuration options then the following environment variables will need to be set:
- GCS_BUCKET, the name of the bucket to save to.
- GCLOUD_PROJECT, this is your projectId. It can be found in the json credentials that you generated.
- GCS_CLIENT_EMAIL, it can be found in the json credentials.
- GCS_PRIVATE_KEY, it can be found in the json credentials.
Explicit method
The constructor of the MulterGoogleCloudStorage class can be passed an optional configuration object.
| Parameter Name | Type | Sample Value |
|---|---|---|
|autoRetry
|boolean
| true
|
|email
|string
|"[email protected]"
|
|keyFilename
|string
|"./key.json"
|
|maxRetries
|number
|2
|
|projectId
|string
|"test-prj-1234"
|
|filename
| function
|(request, file, callback): void
|
|bucket
|string
|"mybucketname"
|
Custom file naming
If you need to customize the naming of files then you are able to provide a function that will be called before uploading the file. The third argument of the function must be a standard node callback so pass any error in the first argument (or null on sucess) and the string name of the file on success.
getFilename(req, file, cb) {
cb(null,`${uuid()}_${file.originalname}`);
}