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An Express Image Server with Node.js: for uploading and resizing images

A simple express server that allows images to be uploaded with Multer and resizes the based on url scheme, resizing is done with the node-steam library.

Http-bearer is used fo validating requests so only registered clients can upload images.

Prerequisites

Installation

1. Run npm install

npm i

2. Configure .env

DB_NAME=
DB_USER=
DB_PASSWORD=
PORT_API=
PORT_IMAGE_SERVER=
IMAGES_DIR=
THROTTLE_CC_PROCESSORS=4
THROTTLE_CC_PREFETCHER= 20
THROTTLE_CC_REQUESTS= 100
APP_URL=
CACHE_TTS=
CACHE_OPTIMIZED_TTS=
CACHE_OPTIMIZED_TTS=

For throttle see options in node-steam.

The app url is used to return a full url after upload.

Images directory defaults to images, if doesn't get created, create it manually.

5. Init database

This will create a database and the first client npm run init

6. Run the server

Run npm (or pm2, or whatever runner you use).

npm run start

Clients

For every site create a row in the MySQL clients table. Generate a random token that's safe. Currently there is no interface for creating so create it command line or through an mysql interface like sequelpro or phpmyadmin.

Uploading an image

Example with node.js, using node-fetch & form-data. Notice dotenv is used for API values. Pass the access_token that you've generated for the client. (For security make sure it's over HTTPS)

const FormData = require('form-data');
const fetch = require('node-fetch');

exports.upload = function (token, buffer, fileName) {
  const form = new FormData();
  form.append('image', buffer, fileName);
  form.append('field', 'files');

  return fetch(process.env.IMAGE_API_URL+ '/image?access_token=' + process.env.IMAGE_API_ACCESS_TOKEN, {
    method: 'POST',
    body: form,
  })
  .then(function(res) {
    return res.json();
  })
  .then(function(json) {
    //json.url
  })
  .catch(function(err) {
    // handle error
  })
}

Displaying & Resizing image

Example for creating a thumbnail resize and crop:

http://imageserver.com/image/path.png/:/rs=w:350,h:250;cp=w:350,h:250

For all options (resizing, cropping, filter, etc) check node-steam.

MySQL with SSL

When you want to connect to a MySQL server using SSL, a Certificate Authority certificate is required. The contents of this CA certificate can be passed into the MYSQL_CA_CERT environment variable.