micro-image-manager/lib/handler/get-image.js

Manage images in your microservices

"use strict";

const fs = require('fs');

const {
  identifyImage
} = require('../util/http-util');

const {
  ObjectID
} = require('mongodb');

module.exports = async (req, res, db) => {
  const {
    id,
    name,
    profile,
    formats
  } = identifyImage(req);
  const loaded = await db.find({
    id,
    name,
    profile,
    formats
  });

  if (loaded) {
    res.writeHead(200, {
      'Content-Type': `image/${loaded.format}`,
      'Cache-Control': 'max-age=31536000, immutable'
    });
    res.end(loaded.data.buffer);
  } else {
    const notFound = profile ? `${__dirname}/../../assets/${profile}.png` : undefined;
    const readStream = fs.createReadStream(notFound);
    readStream.on('open', () => {
      res.writeHead(404, {
        'content-type': 'image/png'
      });
      readStream.pipe(res);
    });
    readStream.on('error', () => {
      res.writeHead(404);
      res.end();
    });
  }
};