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package caddygzip
import (
"compress/flate"
"compress/gzip" // TODO: consider using https://github.com/klauspost/compress/gzip
"fmt"
"github.com/caddyserver/caddy"
"github.com/caddyserver/caddy/modules/caddyhttp/encode"
)
func init() {
caddy.RegisterModule(caddy.Module{
Name: "http.encoders.gzip",
New: func() interface{} { return new(Gzip) },
})
}
// Gzip can create gzip encoders.
type Gzip struct {
Level int `json:"level,omitempty"`
}
// Provision provisions g's configuration.
func (g *Gzip) Provision(ctx caddy.Context) error {
if g.Level == 0 {
g.Level = defaultGzipLevel
}
return nil
}
// Validate validates g's configuration.
func (g Gzip) Validate() error {
if g.Level < flate.NoCompression {
return fmt.Errorf("quality too low; must be >= %d", flate.NoCompression)
}
if g.Level > flate.BestCompression {
return fmt.Errorf("quality too high; must be <= %d", flate.BestCompression)
}
return nil
}
// NewEncoder returns a new gzip writer.
func (g Gzip) NewEncoder() encode.Encoder {
writer, _ := gzip.NewWriterLevel(nil, g.Level)
return writer
}
// Informed from http://blog.klauspost.com/gzip-performance-for-go-webservers/
var defaultGzipLevel = 5
// Interface guards
var (
_ encode.Encoding = (*Gzip)(nil)
_ caddy.Provisioner = (*Gzip)(nil)
_ caddy.Validator = (*Gzip)(nil)
)
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