vermittler

Vermittler is an image processing server written in Go. It can scale, blur and cache images from the web and serve them.

Installation

To install the latest version of vermittler (in master) you just have to get it with go get

go get github.com/mvader/vermittler

Usage

To use vermittler you just have to run it passing the config file you want to use (config.json in your active directory by default)

vermittler -config /path/to/my/config.json

Config

Configuration parameters are very easy and straightforward.

{
    "cache_enabled": true,
    "cache_path": "/path/to/my/dir",
    "port": "8888",
    "verbose": true
}

Requesting images from vermittler

To request an image from vermittler you have to send a GET HTTP request to a running instance of vermittler. For the following examples we'll asume that vermittler is running on http://localhost:8888.

There are 4 parameters that can be specified:

• url: the url of the image requested base64 encoded (not optional)
• w: width of the processed image (optional)
• h: height of the processed image (optional)
• b: blur radius (the higher the blurrier) (optional)

So if we want to request a blurried, 100x100 version of http://golang.org/doc/gopher/gopherbw.png we will use the following URL:

http://localhost:8888/?url=aHR0cDovL3d3dzIub3BlbnBob3RvLm5ldC92b2x1bWVzL3NpemVzL2tvcnJ5LzI1NTQzLzIuanBn&w=100&h=100&b=10

TODO

• More tests (test cache.go and vermittler.go)
• More code coverage
• Add WebP format support.