hook.io image hook for manipulating images using ImageMagick

image.js

/*

  http://hook.io/Marak/image

*/

var gm = require('gm');

module['exports'] = function image (hook, callback) {

  var imageReadStream;

  hook.debug('Opening read stream to image: ' + hook.params.image);
  if (hook.streaming) {
   readStream = hook.req;
  }
  else if (hook.params.image && hook.params.image._readableState.buffer.length > 0) {
    imageReadStream = hook.params.image;
  } else {
    imageReadStream = hook.open(hook.params.url);
  }

  hook.debug('Opening write stream to grey scale transform');
  //var grayScale = hook.post('http://dev.hook.io:9999/Marak/image/greyscale');

  hook.debug('Opening write stream to opacity transform');
  //var transparency = hook.post('http://dev.hook.io:9999/Marak/image/transparency');

  hook.debug('Opening write stream to resize transform');
  var resize = hook.post('http://hook.io/Marak/image/resize?width=' + hook.params.width + "&height=" + hook.params.height);

  hook.debug('Opening write stream to rotate transform');
  var rotate = hook.post('http://hook.io/Marak/image/rotate?degrees=' + hook.params.degrees);

  hook.debug('Writing response headers');
  hook.res.writeHead(200, { 'Content-Type': 'image/png' });
  
  hook.debug('Piping source image through transform streams');
  imageReadStream
   .pipe(resize)
   //	 .pipe(grayScale)
   //	 .pipe(transparency)
   .pipe(rotate)
   .pipe(hook.res);

};

module['exports'].schema = {
  "url": {
    "type": "string",
    "default": "http://hook.io/img/logo.png"
  },
  "image": {
    "type": "file"
  },
  "width": {
    "type": "number",
    "default": 200,
    "required": true
  },
  "height": {
    "type": "number",
    "default": 200,
    "required": true
  },
  "degrees": {
    "type": "number",
    "default": 180
  }
};

presenter.js

module['exports'] = function presentImageHook (opts, cb) {
  var $ = this.$;
  cb(null, $.html());
}

view.html

<h1>image service</h1>