proxy

type Cache interface {
	// Get retrieves the cached data for the provided key.
	Get(key string) (data []byte, ok bool)

	// Set caches the provided data.
	Set(key string, data []byte)

	// Delete deletes the cached data at the specified key.
	Delete(key string)
}

type Options struct {
	Width  float64 // requested width, in pixels
	Height float64 // requested height, in pixels

	// If true, resize the image to fit in the specified dimensions.  Image
	// will not be cropped, and aspect ratio will be maintained.
	Fit bool

	// Rotate image the specified degrees counter-clockwise.  Valid values are 90, 180, 270.
	Rotate int

	FlipVertical   bool
	FlipHorizontal bool
}

type Proxy struct {
	Client *http.Client // client used to fetch remote URLs
	Cache  Cache

	// Whitelist specifies a list of remote hosts that images can be proxied from.  An empty list means all hosts are allowed.
	Whitelist []string

	MaxWidth  int
	MaxHeight int
}

type Request struct {
	URL     *url.URL // URL of the image to proxy
	Options *Options // Image transformation to perform
}

type TransformingTransport struct {
	// Transport is used to satisfy non-transform requests (those that do not include a URL fragment)
	Transport http.RoundTripper

	// Client is used to fetch images to be resized.
	Client *http.Client
}

type URLError struct {
	Message string
	URL     *url.URL
}