strapi/packages/core/upload/server/middlewares/upload.js

'use strict';

const { resolve } = require('path');
const range = require('koa-range');
const koaStatic = require('koa-static');
const _ = require('lodash');

module.exports = {
  defaults: { upload: { enabled: true } },
  load: {
    initialize() {
      const configPublicPath = strapi.config.get(
        'middleware.settings.public.path',
        strapi.config.paths.static
      );
      const staticDir = resolve(strapi.dir, configPublicPath);

      strapi.app.on('error', err => {
        if (err.code === 'EPIPE') {
          // when serving audio or video the browsers sometimes close the connection to go to range requests instead.
          // This causes koa to emit a write EPIPE error. We can ignore it.
          // Right now this ignores it globally and we cannot do much more because it is how koa handles it.
          return;
        }

        strapi.app.onerror(err);
      });

      const localServerConfig =
        _.get(strapi, 'plugins.upload.config.providerOptions.localServer') || {};
      strapi.router.get(
        '/uploads/(.*)',
        range,
        koaStatic(staticDir, { defer: true, ...localServerConfig })
      );
    },
  },
};