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) )