test.js

/**
 * This file is the working implementation of image-resizer used for
 * development purposes. It is a very close example of what is generated by
 * the cli script when provisioning a new instance. `image-resizer new`
 */

'use strict';

var express = require('express'),
    app = express(),
    ir = require('./index'),
    env = ir.env,
    Img = ir.img,
    streams = ir.streams,
    chalk = require('chalk'),
    exec = require('child_process').exec;

// check to see if vips is installed
exec ('vips --version', function (err, stdout, stderr) {
  if (err || stderr) {
    console.error(
      chalk.red('\nMissing dependency:'),
      chalk.red.bold('libvips')
    );

    console.log(
      chalk.cyan('  to install vips on your system run:'),
      chalk.bold('./node_modules/sharp/preinstall.sh\n')
    );
  }
});

app.directory = __dirname;
ir.expressConfig(app);

app.get('/favicon.ico', function (request, response) {
  response.sendStatus(404);
});

/**
 * Return the modifiers map as a documentation endpoint
 */
app.get('/modifiers.json', function(request, response){
  response.json(ir.modifiers);
});


/**
 * Some helper endpoints when in development
 */
if (env.development){
  // Show a test page of the image options
  app.get('/test-page', function(request, response){
    response.render('index.html');
  });

  // Show the environment variables and their current values
  app.get('/env', function(request, response){
    response.status(200).json(env);
  });
}

/**
 * Return an image modified to the requested parameters
 *   - request format:
 *     /:modifers/path/to/image.format:metadata
 *     eg: https://doapv6pcsx1wa.cloudfront.net/s50/sample/test.png
 */
app.get('/*?', function(request, response){
  var image = new Img(request);

  var stream = image.getFile().pipe(new streams.identify());
  stream = stream.pipe(new streams.resize());
  stream = stream.pipe(new streams.filter());
  stream = stream.pipe(new streams.optimize());

  stream.pipe(streams.response(request, response));
});


/**
Start the app on the listed port
*/
app.listen(app.get('port'));