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57 lines
1.3 KiB
Go
57 lines
1.3 KiB
Go
package caddygzip
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import (
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"compress/flate"
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"compress/gzip" // TODO: consider using https://github.com/klauspost/compress/gzip
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"fmt"
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"github.com/caddyserver/caddy2"
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"github.com/caddyserver/caddy2/modules/caddyhttp/encode"
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)
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func init() {
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caddy2.RegisterModule(caddy2.Module{
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Name: "http.encoders.gzip",
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New: func() interface{} { return new(Gzip) },
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})
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}
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// Gzip can create gzip encoders.
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type Gzip struct {
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Level int `json:"level,omitempty"`
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}
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// Provision provisions g's configuration.
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func (g *Gzip) Provision(ctx caddy2.Context) error {
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if g.Level == 0 {
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g.Level = defaultGzipLevel
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}
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return nil
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}
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// Validate validates g's configuration.
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func (g Gzip) Validate() error {
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if g.Level < flate.NoCompression {
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return fmt.Errorf("quality too low; must be >= %d", flate.NoCompression)
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}
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if g.Level > flate.BestCompression {
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return fmt.Errorf("quality too high; must be <= %d", flate.BestCompression)
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}
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return nil
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}
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// NewEncoder returns a new gzip writer.
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func (g Gzip) NewEncoder() encode.Encoder {
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writer, _ := gzip.NewWriterLevel(nil, g.Level)
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return writer
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}
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// Informed from http://blog.klauspost.com/gzip-performance-for-go-webservers/
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var defaultGzipLevel = 5
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// Interface guards
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var (
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_ encode.Encoding = (*Gzip)(nil)
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_ caddy2.Provisioner = (*Gzip)(nil)
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_ caddy2.Validator = (*Gzip)(nil)
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)
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