Image resizing service (for Rails, or anything really) [closed]

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I'm looking for a (ideally self-hosted) service that lets me do something like

<img src="http://image-resizer.domain.com/resize-image/150/100/path/to/image.jpg" />

This service would:

• download http://mydomain.com/path/to/image.jpg (if it hadn't before)
• resize it to 150x100
• strip / squash the thumbnail of metadata (and whatever else is good for thumbnails)
• cache the thumbnail (to disk, or maybe to s3?)
• serve it to the client
• on subsequent requests for that URL, serve the same cached thumbnail

This would allow me

• only have the origi开发者_StackOverflownal image on my site and outsource the thumbnail generation to another service
• allow me to easily create new thumbnail sizes
• should be efficient

Does something like that exist? Would prefer open source, and hopefully either in Ruby or Node.js.

Bonus points for working on a limited amount of diskspace (i.e. so it would only cache, say, 5GB of images).

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I found Dragonfly: https://github.com/markevans/dragonfly

"An on-the-fly processing/encoding framework written as a Rack application."

It's close to what I was looking for, but I'd prefer something totally separate. Dragonfly looks like it needs to be embedded in your Rails application as a Rack app. (Not an option for me, since I'm still on Rails 2.2)

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There are a number of SaaS solutions out there:

www.cloudinary.com <-- This is one of the best ones, I've used it extensively!

www.transloadit.com

www.blitline.com

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Image Science may fulfill your thumbnailing needs, although the whole caching, hosting and metadata stripping will require other tools.