Imgproxy

Imgproxy is an Elixir library that helps generate imgproxy URLs. Before using this library, you should have a running imgproxy server.

Installation

To install Imgproxy, just add an entry to your mix.exs:

def deps do
  [
    # ...
    {:imgproxy, "~> 1.0"}
  ]
end

(Check Hex to make sure you're using an up-to-date version number.)

Configuration

In your config/config.exs you can set a few options:

config :imgproxy,
  prefix: "https://imgcdn.example.com",
  key: "cdf104fc78b7d7f6f0158c253612f5dsecretsecret...",
  salt: "aad7034f611b7fc28c6d344f72ea19secretsecret..."

The prefix should be the location of the imgproxy server. key and salt are only necessary if you are using URL signatures. To generate the key a key and salt, you can use:

$> mix imgproxy.gen.secret

You can use the output as your key or salt (ideally, just run the command twice, use the first output for your key and the second output for your salt).

Usage

Usage is basically constrained to the url function, which accepts the original URL for an image and optional parameters for image conversion.

Example:

# Generate URL for an image, using defaults
Imgproxy.url("https://placekitten.com/200/300")

# Set all parameters
Imgproxy.url("https://placekitten.com/200/300",
  resize: "fill",
  width: 123,
  height: 321,
  gravity: "sm",
  enlarge: "1",
  extension: "jpg")

# Generate URL for an image with set width of 150 and
# height of 200, and all other defaults.  This signature
# is useful if you just want to set width/height.
Imgproxy.url("https://placekitten.com/200/300", 150, 200)

The optional parameters are:

resize: default, "fill"
width and height: default, 300x300
gravity: default, "sm" for smart. libvips detects the most "interesting" section of the image and considers it as the center of the resulting image.
enlarge: default, "1"
extension: default, attempts to preserve the original image type

The imgproxy docs have more details on what each of these options indicate.

Running Tests

To run tests:

$> mix test

Reporting Issues