Imagine

Imagine is a real-time image processing and storage host built in node.js. Usually, image hosts have to download, transform, and re-serve images as discreet operations. Imagine pools these tasks and streams the results back as soon as possible using a combination of node's events.EventEmitter and HTTP transfer-encoding: chunked.

Installation

Download the package to a local folder, then run:

$ npm install

You can then start the server (after setting up the config) with:

$ npm start

Uploading an Image

Uploading images is really easy. Simply name the file and pass in its source URL:

http://localhost:8101/cat?source=http://funny.com/cat_image.jpg

Retrieving an Image

Once you've uploaded an image, you can retrieve it later using its name:

http://localhost:8101/cat

Default Operations on an Image

Imagine ships with Imagine-Magick to allow basic transformations on an image just by changing its URL. For example:

http://localhost:8101/cat/resize/250x200/blur/5/paint/5/

Default Image Stores

Imagine has three different image storage options included by default:

• Imagine-File - Local file storage
• Imagine-Cloudfiles - Rackspace Cloud Files
• Imagine-S3 - Amazon S3

For example, you can switch to S3 by editing your config as such:

"storage": "imagine-s3",

"imagine-s3": {
  "key": "KEY",
  "secret": "SECRET",
  "bucket": "mybucket"
}

Visit each storage module's github page for more information.

Operation & Storage Modules

Imagine was built to be modular and offers simple ways to extend its default configuration to include all types of operations and data stores, tailoring the image host to your specific needs. Look at the Wiki for more information.

Securing Image Uploads

You don't want to host an open image server to the world. Neither do we. For that, Imagine handles hmac_sha1 shared key signing. If you set a signedKey option in your config, source requests will only be allowed when the request is also passed a sign parameter correspending to the hmac_sha1 hash of the source URL and your signedKey. Like so:

hmac_sha1(source, signedKey);

Winston Logging

Imagine uses Winston for logging. You can change the default Console implementation by editing the config. For instance, the "File" transport:

"logging": [
  {
    "type": "File",
    "filename": "somefile.log"
  }
]

Statsd + Graphite

Statsd support is also included. To turn it on, add a segment to your config:

"statsd": {
  "host": "xxx",
  "port": 123,
  "prefix": "some.prefix."
}

License

Imagine is freely distributed under the MIT License. See LICENSE for more details.